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Converted sys_mkdir and sys_open.
[bpt/emacs.git] / src / w32.c
1 /* Utility and Unix shadow routines for GNU Emacs on the Microsoft Windows API.
2 Copyright (C) 1994-1995, 2000-2013 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
18
19 /*
20 Geoff Voelker (voelker@cs.washington.edu) 7-29-94
21 */
22
23 #include <mingw_time.h>
24 #include <stddef.h> /* for offsetof */
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <float.h> /* for DBL_EPSILON */
28 #include <io.h>
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <ctype.h>
32 #include <signal.h>
33 #include <sys/file.h>
34 #include <time.h> /* must be before nt/inc/sys/time.h, for MinGW64 */
35 #include <sys/time.h>
36 #include <sys/utime.h>
37 #include <math.h>
38
39 /* must include CRT headers *before* config.h */
40
41 #include <config.h>
42 #include <mbstring.h> /* for _mbspbrk, _mbslwr, _mbsrchr, ... */
43
44 #undef access
45 #undef chdir
46 #undef chmod
47 #undef creat
48 #undef ctime
49 #undef fopen
50 #undef link
51 #undef mkdir
52 #undef open
53 #undef rename
54 #undef rmdir
55 #undef unlink
56
57 #undef close
58 #undef dup
59 #undef dup2
60 #undef pipe
61 #undef read
62 #undef write
63
64 #undef strerror
65
66 #undef localtime
67
68 #include "lisp.h"
69 #include "epaths.h" /* for SHELL */
70
71 #include <pwd.h>
72 #include <grp.h>
73
74 /* MinGW64 (_W64) defines these in its _mingw.h. */
75 #if defined(__GNUC__) && !defined(_W64)
76 #define _ANONYMOUS_UNION
77 #define _ANONYMOUS_STRUCT
78 #endif
79 #include <windows.h>
80 /* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
81 use a different name to avoid compilation problems. */
82 typedef struct _MEMORY_STATUS_EX {
83 DWORD dwLength;
84 DWORD dwMemoryLoad;
85 DWORDLONG ullTotalPhys;
86 DWORDLONG ullAvailPhys;
87 DWORDLONG ullTotalPageFile;
88 DWORDLONG ullAvailPageFile;
89 DWORDLONG ullTotalVirtual;
90 DWORDLONG ullAvailVirtual;
91 DWORDLONG ullAvailExtendedVirtual;
92 } MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
93
94 /* These are here so that GDB would know about these data types. This
95 allows to attach GDB to Emacs when a fatal exception is triggered
96 and Windows pops up the "application needs to be closed" dialog.
97 At that point, _gnu_exception_handler, the top-level exception
98 handler installed by the MinGW startup code, is somewhere on the
99 call-stack of the main thread, so going to that call frame and
100 looking at the argument to _gnu_exception_handler, which is a
101 PEXCEPTION_POINTERS pointer, can reveal the exception code
102 (excptr->ExceptionRecord->ExceptionCode) and the address where the
103 exception happened (excptr->ExceptionRecord->ExceptionAddress), as
104 well as some additional information specific to the exception. */
105 PEXCEPTION_POINTERS excptr;
106 PEXCEPTION_RECORD excprec;
107 PCONTEXT ctxrec;
108
109 #include <lmcons.h>
110 #include <shlobj.h>
111
112 #include <tlhelp32.h>
113 #include <psapi.h>
114 #ifndef _MSC_VER
115 #include <w32api.h>
116 #endif
117 #if _WIN32_WINNT < 0x0500
118 #if !defined (__MINGW32__) || __W32API_MAJOR_VERSION < 3 || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 15)
119 /* This either is not in psapi.h or guarded by higher value of
120 _WIN32_WINNT than what we use. w32api supplied with MinGW 3.15
121 defines it in psapi.h */
122 typedef struct _PROCESS_MEMORY_COUNTERS_EX {
123 DWORD cb;
124 DWORD PageFaultCount;
125 SIZE_T PeakWorkingSetSize;
126 SIZE_T WorkingSetSize;
127 SIZE_T QuotaPeakPagedPoolUsage;
128 SIZE_T QuotaPagedPoolUsage;
129 SIZE_T QuotaPeakNonPagedPoolUsage;
130 SIZE_T QuotaNonPagedPoolUsage;
131 SIZE_T PagefileUsage;
132 SIZE_T PeakPagefileUsage;
133 SIZE_T PrivateUsage;
134 } PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;
135 #endif
136 #endif
137
138 #include <winioctl.h>
139 #include <aclapi.h>
140 #include <sddl.h>
141
142 #include <sys/acl.h>
143
144 /* This is not in MinGW's sddl.h (but they are in MSVC headers), so we
145 define them by hand if not already defined. */
146 #ifndef SDDL_REVISION_1
147 #define SDDL_REVISION_1 1
148 #endif /* SDDL_REVISION_1 */
149
150 #if defined(_MSC_VER) || defined(_W64)
151 /* MSVC and MinGW64 don't provide the definition of
152 REPARSE_DATA_BUFFER and the associated macros, except on ntifs.h,
153 which cannot be included because it triggers conflicts with other
154 Windows API headers. So we define it here by hand. */
155
156 typedef struct _REPARSE_DATA_BUFFER {
157 ULONG ReparseTag;
158 USHORT ReparseDataLength;
159 USHORT Reserved;
160 union {
161 struct {
162 USHORT SubstituteNameOffset;
163 USHORT SubstituteNameLength;
164 USHORT PrintNameOffset;
165 USHORT PrintNameLength;
166 ULONG Flags;
167 WCHAR PathBuffer[1];
168 } SymbolicLinkReparseBuffer;
169 struct {
170 USHORT SubstituteNameOffset;
171 USHORT SubstituteNameLength;
172 USHORT PrintNameOffset;
173 USHORT PrintNameLength;
174 WCHAR PathBuffer[1];
175 } MountPointReparseBuffer;
176 struct {
177 UCHAR DataBuffer[1];
178 } GenericReparseBuffer;
179 } DUMMYUNIONNAME;
180 } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
181
182 #ifndef FILE_DEVICE_FILE_SYSTEM
183 #define FILE_DEVICE_FILE_SYSTEM 9
184 #endif
185 #ifndef METHOD_BUFFERED
186 #define METHOD_BUFFERED 0
187 #endif
188 #ifndef FILE_ANY_ACCESS
189 #define FILE_ANY_ACCESS 0x00000000
190 #endif
191 #ifndef CTL_CODE
192 #define CTL_CODE(t,f,m,a) (((t)<<16)|((a)<<14)|((f)<<2)|(m))
193 #endif
194 /* MinGW64 defines FSCTL_GET_REPARSE_POINT on winioctl.h. */
195 #ifndef FSCTL_GET_REPARSE_POINT
196 #define FSCTL_GET_REPARSE_POINT \
197 CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
198 #endif
199 #endif
200
201 /* TCP connection support. */
202 #include <sys/socket.h>
203 #undef socket
204 #undef bind
205 #undef connect
206 #undef htons
207 #undef ntohs
208 #undef inet_addr
209 #undef gethostname
210 #undef gethostbyname
211 #undef getservbyname
212 #undef getpeername
213 #undef shutdown
214 #undef setsockopt
215 #undef listen
216 #undef getsockname
217 #undef accept
218 #undef recvfrom
219 #undef sendto
220
221 #include <iphlpapi.h> /* should be after winsock2.h */
222
223 #include "w32.h"
224 #include <dirent.h>
225 #include "w32common.h"
226 #include "w32heap.h"
227 #include "w32select.h"
228 #include "systime.h"
229 #include "dispextern.h" /* for xstrcasecmp */
230 #include "coding.h" /* for Vlocale_coding_system */
231
232 #include "careadlinkat.h"
233 #include "allocator.h"
234
235 /* For serial_configure and serial_open. */
236 #include "process.h"
237
238 typedef HRESULT (WINAPI * ShGetFolderPath_fn)
239 (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);
240
241 Lisp_Object QCloaded_from;
242
243 void globals_of_w32 (void);
244 static DWORD get_rid (PSID);
245 static int is_symlink (const char *);
246 static char * chase_symlinks (const char *);
247 static int enable_privilege (LPCTSTR, BOOL, TOKEN_PRIVILEGES *);
248 static int restore_privilege (TOKEN_PRIVILEGES *);
249 static BOOL WINAPI revert_to_self (void);
250
251 static int sys_access (const char *, int);
252 extern void *e_malloc (size_t);
253 extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
254 struct timespec *, void *);
255 extern int sys_dup (int);
256
257
258
259 \f
260 /* Initialization states.
261
262 WARNING: If you add any more such variables for additional APIs,
263 you MUST add initialization for them to globals_of_w32
264 below. This is because these variables might get set
265 to non-NULL values during dumping, but the dumped Emacs
266 cannot reuse those values, because it could be run on a
267 different version of the OS, where API addresses are
268 different. */
269 static BOOL g_b_init_is_windows_9x;
270 static BOOL g_b_init_open_process_token;
271 static BOOL g_b_init_get_token_information;
272 static BOOL g_b_init_lookup_account_sid;
273 static BOOL g_b_init_get_sid_sub_authority;
274 static BOOL g_b_init_get_sid_sub_authority_count;
275 static BOOL g_b_init_get_security_info;
276 static BOOL g_b_init_get_file_security;
277 static BOOL g_b_init_get_security_descriptor_owner;
278 static BOOL g_b_init_get_security_descriptor_group;
279 static BOOL g_b_init_is_valid_sid;
280 static BOOL g_b_init_create_toolhelp32_snapshot;
281 static BOOL g_b_init_process32_first;
282 static BOOL g_b_init_process32_next;
283 static BOOL g_b_init_open_thread_token;
284 static BOOL g_b_init_impersonate_self;
285 static BOOL g_b_init_revert_to_self;
286 static BOOL g_b_init_get_process_memory_info;
287 static BOOL g_b_init_get_process_working_set_size;
288 static BOOL g_b_init_global_memory_status;
289 static BOOL g_b_init_global_memory_status_ex;
290 static BOOL g_b_init_get_length_sid;
291 static BOOL g_b_init_equal_sid;
292 static BOOL g_b_init_copy_sid;
293 static BOOL g_b_init_get_native_system_info;
294 static BOOL g_b_init_get_system_times;
295 static BOOL g_b_init_create_symbolic_link;
296 static BOOL g_b_init_get_security_descriptor_dacl;
297 static BOOL g_b_init_convert_sd_to_sddl;
298 static BOOL g_b_init_convert_sddl_to_sd;
299 static BOOL g_b_init_is_valid_security_descriptor;
300 static BOOL g_b_init_set_file_security;
301 static BOOL g_b_init_get_adapters_info;
302
303 /*
304 BEGIN: Wrapper functions around OpenProcessToken
305 and other functions in advapi32.dll that are only
306 supported in Windows NT / 2k / XP
307 */
308 /* ** Function pointer typedefs ** */
309 typedef BOOL (WINAPI * OpenProcessToken_Proc) (
310 HANDLE ProcessHandle,
311 DWORD DesiredAccess,
312 PHANDLE TokenHandle);
313 typedef BOOL (WINAPI * GetTokenInformation_Proc) (
314 HANDLE TokenHandle,
315 TOKEN_INFORMATION_CLASS TokenInformationClass,
316 LPVOID TokenInformation,
317 DWORD TokenInformationLength,
318 PDWORD ReturnLength);
319 typedef BOOL (WINAPI * GetProcessTimes_Proc) (
320 HANDLE process_handle,
321 LPFILETIME creation_time,
322 LPFILETIME exit_time,
323 LPFILETIME kernel_time,
324 LPFILETIME user_time);
325
326 GetProcessTimes_Proc get_process_times_fn = NULL;
327
328 #ifdef _UNICODE
329 const char * const LookupAccountSid_Name = "LookupAccountSidW";
330 const char * const GetFileSecurity_Name = "GetFileSecurityW";
331 const char * const SetFileSecurity_Name = "SetFileSecurityW";
332 #else
333 const char * const LookupAccountSid_Name = "LookupAccountSidA";
334 const char * const GetFileSecurity_Name = "GetFileSecurityA";
335 const char * const SetFileSecurity_Name = "SetFileSecurityA";
336 #endif
337 typedef BOOL (WINAPI * LookupAccountSid_Proc) (
338 LPCTSTR lpSystemName,
339 PSID Sid,
340 LPTSTR Name,
341 LPDWORD cbName,
342 LPTSTR DomainName,
343 LPDWORD cbDomainName,
344 PSID_NAME_USE peUse);
345 typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
346 PSID pSid,
347 DWORD n);
348 typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
349 PSID pSid);
350 typedef DWORD (WINAPI * GetSecurityInfo_Proc) (
351 HANDLE handle,
352 SE_OBJECT_TYPE ObjectType,
353 SECURITY_INFORMATION SecurityInfo,
354 PSID *ppsidOwner,
355 PSID *ppsidGroup,
356 PACL *ppDacl,
357 PACL *ppSacl,
358 PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
359 typedef BOOL (WINAPI * GetFileSecurity_Proc) (
360 LPCTSTR lpFileName,
361 SECURITY_INFORMATION RequestedInformation,
362 PSECURITY_DESCRIPTOR pSecurityDescriptor,
363 DWORD nLength,
364 LPDWORD lpnLengthNeeded);
365 typedef BOOL (WINAPI *SetFileSecurity_Proc) (
366 LPCTSTR lpFileName,
367 SECURITY_INFORMATION SecurityInformation,
368 PSECURITY_DESCRIPTOR pSecurityDescriptor);
369 typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
370 PSECURITY_DESCRIPTOR pSecurityDescriptor,
371 PSID *pOwner,
372 LPBOOL lpbOwnerDefaulted);
373 typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
374 PSECURITY_DESCRIPTOR pSecurityDescriptor,
375 PSID *pGroup,
376 LPBOOL lpbGroupDefaulted);
377 typedef BOOL (WINAPI *GetSecurityDescriptorDacl_Proc) (
378 PSECURITY_DESCRIPTOR pSecurityDescriptor,
379 LPBOOL lpbDaclPresent,
380 PACL *pDacl,
381 LPBOOL lpbDaclDefaulted);
382 typedef BOOL (WINAPI * IsValidSid_Proc) (
383 PSID sid);
384 typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
385 DWORD dwFlags,
386 DWORD th32ProcessID);
387 typedef BOOL (WINAPI * Process32First_Proc) (
388 HANDLE hSnapshot,
389 LPPROCESSENTRY32 lppe);
390 typedef BOOL (WINAPI * Process32Next_Proc) (
391 HANDLE hSnapshot,
392 LPPROCESSENTRY32 lppe);
393 typedef BOOL (WINAPI * OpenThreadToken_Proc) (
394 HANDLE ThreadHandle,
395 DWORD DesiredAccess,
396 BOOL OpenAsSelf,
397 PHANDLE TokenHandle);
398 typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
399 SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
400 typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
401 typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
402 HANDLE Process,
403 PPROCESS_MEMORY_COUNTERS ppsmemCounters,
404 DWORD cb);
405 typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
406 HANDLE hProcess,
407 PSIZE_T lpMinimumWorkingSetSize,
408 PSIZE_T lpMaximumWorkingSetSize);
409 typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
410 LPMEMORYSTATUS lpBuffer);
411 typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
412 LPMEMORY_STATUS_EX lpBuffer);
413 typedef BOOL (WINAPI * CopySid_Proc) (
414 DWORD nDestinationSidLength,
415 PSID pDestinationSid,
416 PSID pSourceSid);
417 typedef BOOL (WINAPI * EqualSid_Proc) (
418 PSID pSid1,
419 PSID pSid2);
420 typedef DWORD (WINAPI * GetLengthSid_Proc) (
421 PSID pSid);
422 typedef void (WINAPI * GetNativeSystemInfo_Proc) (
423 LPSYSTEM_INFO lpSystemInfo);
424 typedef BOOL (WINAPI * GetSystemTimes_Proc) (
425 LPFILETIME lpIdleTime,
426 LPFILETIME lpKernelTime,
427 LPFILETIME lpUserTime);
428 typedef BOOLEAN (WINAPI *CreateSymbolicLink_Proc) (
429 LPTSTR lpSymlinkFileName,
430 LPTSTR lpTargetFileName,
431 DWORD dwFlags);
432 typedef BOOL (WINAPI *ConvertStringSecurityDescriptorToSecurityDescriptor_Proc) (
433 LPCTSTR StringSecurityDescriptor,
434 DWORD StringSDRevision,
435 PSECURITY_DESCRIPTOR *SecurityDescriptor,
436 PULONG SecurityDescriptorSize);
437 typedef BOOL (WINAPI *ConvertSecurityDescriptorToStringSecurityDescriptor_Proc) (
438 PSECURITY_DESCRIPTOR SecurityDescriptor,
439 DWORD RequestedStringSDRevision,
440 SECURITY_INFORMATION SecurityInformation,
441 LPTSTR *StringSecurityDescriptor,
442 PULONG StringSecurityDescriptorLen);
443 typedef BOOL (WINAPI *IsValidSecurityDescriptor_Proc) (PSECURITY_DESCRIPTOR);
444 typedef DWORD (WINAPI *GetAdaptersInfo_Proc) (
445 PIP_ADAPTER_INFO pAdapterInfo,
446 PULONG pOutBufLen);
447
448 /* ** A utility function ** */
449 static BOOL
450 is_windows_9x (void)
451 {
452 static BOOL s_b_ret = 0;
453 OSVERSIONINFO os_ver;
454 if (g_b_init_is_windows_9x == 0)
455 {
456 g_b_init_is_windows_9x = 1;
457 ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
458 os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
459 if (GetVersionEx (&os_ver))
460 {
461 s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
462 }
463 }
464 return s_b_ret;
465 }
466
467 static Lisp_Object ltime (ULONGLONG);
468
469 /* Get total user and system times for get-internal-run-time.
470 Returns a list of integers if the times are provided by the OS
471 (NT derivatives), otherwise it returns the result of current-time. */
472 Lisp_Object
473 w32_get_internal_run_time (void)
474 {
475 if (get_process_times_fn)
476 {
477 FILETIME create, exit, kernel, user;
478 HANDLE proc = GetCurrentProcess ();
479 if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
480 {
481 LARGE_INTEGER user_int, kernel_int, total;
482 user_int.LowPart = user.dwLowDateTime;
483 user_int.HighPart = user.dwHighDateTime;
484 kernel_int.LowPart = kernel.dwLowDateTime;
485 kernel_int.HighPart = kernel.dwHighDateTime;
486 total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
487 return ltime (total.QuadPart);
488 }
489 }
490
491 return Fcurrent_time ();
492 }
493
494 /* ** The wrapper functions ** */
495
496 static BOOL WINAPI
497 open_process_token (HANDLE ProcessHandle,
498 DWORD DesiredAccess,
499 PHANDLE TokenHandle)
500 {
501 static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
502 HMODULE hm_advapi32 = NULL;
503 if (is_windows_9x () == TRUE)
504 {
505 return FALSE;
506 }
507 if (g_b_init_open_process_token == 0)
508 {
509 g_b_init_open_process_token = 1;
510 hm_advapi32 = LoadLibrary ("Advapi32.dll");
511 s_pfn_Open_Process_Token =
512 (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
513 }
514 if (s_pfn_Open_Process_Token == NULL)
515 {
516 return FALSE;
517 }
518 return (
519 s_pfn_Open_Process_Token (
520 ProcessHandle,
521 DesiredAccess,
522 TokenHandle)
523 );
524 }
525
526 static BOOL WINAPI
527 get_token_information (HANDLE TokenHandle,
528 TOKEN_INFORMATION_CLASS TokenInformationClass,
529 LPVOID TokenInformation,
530 DWORD TokenInformationLength,
531 PDWORD ReturnLength)
532 {
533 static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
534 HMODULE hm_advapi32 = NULL;
535 if (is_windows_9x () == TRUE)
536 {
537 return FALSE;
538 }
539 if (g_b_init_get_token_information == 0)
540 {
541 g_b_init_get_token_information = 1;
542 hm_advapi32 = LoadLibrary ("Advapi32.dll");
543 s_pfn_Get_Token_Information =
544 (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
545 }
546 if (s_pfn_Get_Token_Information == NULL)
547 {
548 return FALSE;
549 }
550 return (
551 s_pfn_Get_Token_Information (
552 TokenHandle,
553 TokenInformationClass,
554 TokenInformation,
555 TokenInformationLength,
556 ReturnLength)
557 );
558 }
559
560 static BOOL WINAPI
561 lookup_account_sid (LPCTSTR lpSystemName,
562 PSID Sid,
563 LPTSTR Name,
564 LPDWORD cbName,
565 LPTSTR DomainName,
566 LPDWORD cbDomainName,
567 PSID_NAME_USE peUse)
568 {
569 static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
570 HMODULE hm_advapi32 = NULL;
571 if (is_windows_9x () == TRUE)
572 {
573 return FALSE;
574 }
575 if (g_b_init_lookup_account_sid == 0)
576 {
577 g_b_init_lookup_account_sid = 1;
578 hm_advapi32 = LoadLibrary ("Advapi32.dll");
579 s_pfn_Lookup_Account_Sid =
580 (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
581 }
582 if (s_pfn_Lookup_Account_Sid == NULL)
583 {
584 return FALSE;
585 }
586 return (
587 s_pfn_Lookup_Account_Sid (
588 lpSystemName,
589 Sid,
590 Name,
591 cbName,
592 DomainName,
593 cbDomainName,
594 peUse)
595 );
596 }
597
598 static PDWORD WINAPI
599 get_sid_sub_authority (PSID pSid, DWORD n)
600 {
601 static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
602 static DWORD zero = 0U;
603 HMODULE hm_advapi32 = NULL;
604 if (is_windows_9x () == TRUE)
605 {
606 return &zero;
607 }
608 if (g_b_init_get_sid_sub_authority == 0)
609 {
610 g_b_init_get_sid_sub_authority = 1;
611 hm_advapi32 = LoadLibrary ("Advapi32.dll");
612 s_pfn_Get_Sid_Sub_Authority =
613 (GetSidSubAuthority_Proc) GetProcAddress (
614 hm_advapi32, "GetSidSubAuthority");
615 }
616 if (s_pfn_Get_Sid_Sub_Authority == NULL)
617 {
618 return &zero;
619 }
620 return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
621 }
622
623 static PUCHAR WINAPI
624 get_sid_sub_authority_count (PSID pSid)
625 {
626 static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
627 static UCHAR zero = 0U;
628 HMODULE hm_advapi32 = NULL;
629 if (is_windows_9x () == TRUE)
630 {
631 return &zero;
632 }
633 if (g_b_init_get_sid_sub_authority_count == 0)
634 {
635 g_b_init_get_sid_sub_authority_count = 1;
636 hm_advapi32 = LoadLibrary ("Advapi32.dll");
637 s_pfn_Get_Sid_Sub_Authority_Count =
638 (GetSidSubAuthorityCount_Proc) GetProcAddress (
639 hm_advapi32, "GetSidSubAuthorityCount");
640 }
641 if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
642 {
643 return &zero;
644 }
645 return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
646 }
647
648 static DWORD WINAPI
649 get_security_info (HANDLE handle,
650 SE_OBJECT_TYPE ObjectType,
651 SECURITY_INFORMATION SecurityInfo,
652 PSID *ppsidOwner,
653 PSID *ppsidGroup,
654 PACL *ppDacl,
655 PACL *ppSacl,
656 PSECURITY_DESCRIPTOR *ppSecurityDescriptor)
657 {
658 static GetSecurityInfo_Proc s_pfn_Get_Security_Info = NULL;
659 HMODULE hm_advapi32 = NULL;
660 if (is_windows_9x () == TRUE)
661 {
662 return FALSE;
663 }
664 if (g_b_init_get_security_info == 0)
665 {
666 g_b_init_get_security_info = 1;
667 hm_advapi32 = LoadLibrary ("Advapi32.dll");
668 s_pfn_Get_Security_Info =
669 (GetSecurityInfo_Proc) GetProcAddress (
670 hm_advapi32, "GetSecurityInfo");
671 }
672 if (s_pfn_Get_Security_Info == NULL)
673 {
674 return FALSE;
675 }
676 return (s_pfn_Get_Security_Info (handle, ObjectType, SecurityInfo,
677 ppsidOwner, ppsidGroup, ppDacl, ppSacl,
678 ppSecurityDescriptor));
679 }
680
681 static BOOL WINAPI
682 get_file_security (LPCTSTR lpFileName,
683 SECURITY_INFORMATION RequestedInformation,
684 PSECURITY_DESCRIPTOR pSecurityDescriptor,
685 DWORD nLength,
686 LPDWORD lpnLengthNeeded)
687 {
688 static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
689 HMODULE hm_advapi32 = NULL;
690 if (is_windows_9x () == TRUE)
691 {
692 errno = ENOTSUP;
693 return FALSE;
694 }
695 if (g_b_init_get_file_security == 0)
696 {
697 g_b_init_get_file_security = 1;
698 hm_advapi32 = LoadLibrary ("Advapi32.dll");
699 s_pfn_Get_File_Security =
700 (GetFileSecurity_Proc) GetProcAddress (
701 hm_advapi32, GetFileSecurity_Name);
702 }
703 if (s_pfn_Get_File_Security == NULL)
704 {
705 errno = ENOTSUP;
706 return FALSE;
707 }
708 return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
709 pSecurityDescriptor, nLength,
710 lpnLengthNeeded));
711 }
712
713 static BOOL WINAPI
714 set_file_security (LPCTSTR lpFileName,
715 SECURITY_INFORMATION SecurityInformation,
716 PSECURITY_DESCRIPTOR pSecurityDescriptor)
717 {
718 static SetFileSecurity_Proc s_pfn_Set_File_Security = NULL;
719 HMODULE hm_advapi32 = NULL;
720 if (is_windows_9x () == TRUE)
721 {
722 errno = ENOTSUP;
723 return FALSE;
724 }
725 if (g_b_init_set_file_security == 0)
726 {
727 g_b_init_set_file_security = 1;
728 hm_advapi32 = LoadLibrary ("Advapi32.dll");
729 s_pfn_Set_File_Security =
730 (SetFileSecurity_Proc) GetProcAddress (
731 hm_advapi32, SetFileSecurity_Name);
732 }
733 if (s_pfn_Set_File_Security == NULL)
734 {
735 errno = ENOTSUP;
736 return FALSE;
737 }
738 return (s_pfn_Set_File_Security (lpFileName, SecurityInformation,
739 pSecurityDescriptor));
740 }
741
742 static BOOL WINAPI
743 get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
744 PSID *pOwner,
745 LPBOOL lpbOwnerDefaulted)
746 {
747 static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
748 HMODULE hm_advapi32 = NULL;
749 if (is_windows_9x () == TRUE)
750 {
751 errno = ENOTSUP;
752 return FALSE;
753 }
754 if (g_b_init_get_security_descriptor_owner == 0)
755 {
756 g_b_init_get_security_descriptor_owner = 1;
757 hm_advapi32 = LoadLibrary ("Advapi32.dll");
758 s_pfn_Get_Security_Descriptor_Owner =
759 (GetSecurityDescriptorOwner_Proc) GetProcAddress (
760 hm_advapi32, "GetSecurityDescriptorOwner");
761 }
762 if (s_pfn_Get_Security_Descriptor_Owner == NULL)
763 {
764 errno = ENOTSUP;
765 return FALSE;
766 }
767 return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
768 lpbOwnerDefaulted));
769 }
770
771 static BOOL WINAPI
772 get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
773 PSID *pGroup,
774 LPBOOL lpbGroupDefaulted)
775 {
776 static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
777 HMODULE hm_advapi32 = NULL;
778 if (is_windows_9x () == TRUE)
779 {
780 errno = ENOTSUP;
781 return FALSE;
782 }
783 if (g_b_init_get_security_descriptor_group == 0)
784 {
785 g_b_init_get_security_descriptor_group = 1;
786 hm_advapi32 = LoadLibrary ("Advapi32.dll");
787 s_pfn_Get_Security_Descriptor_Group =
788 (GetSecurityDescriptorGroup_Proc) GetProcAddress (
789 hm_advapi32, "GetSecurityDescriptorGroup");
790 }
791 if (s_pfn_Get_Security_Descriptor_Group == NULL)
792 {
793 errno = ENOTSUP;
794 return FALSE;
795 }
796 return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
797 lpbGroupDefaulted));
798 }
799
800 static BOOL WINAPI
801 get_security_descriptor_dacl (PSECURITY_DESCRIPTOR pSecurityDescriptor,
802 LPBOOL lpbDaclPresent,
803 PACL *pDacl,
804 LPBOOL lpbDaclDefaulted)
805 {
806 static GetSecurityDescriptorDacl_Proc s_pfn_Get_Security_Descriptor_Dacl = NULL;
807 HMODULE hm_advapi32 = NULL;
808 if (is_windows_9x () == TRUE)
809 {
810 errno = ENOTSUP;
811 return FALSE;
812 }
813 if (g_b_init_get_security_descriptor_dacl == 0)
814 {
815 g_b_init_get_security_descriptor_dacl = 1;
816 hm_advapi32 = LoadLibrary ("Advapi32.dll");
817 s_pfn_Get_Security_Descriptor_Dacl =
818 (GetSecurityDescriptorDacl_Proc) GetProcAddress (
819 hm_advapi32, "GetSecurityDescriptorDacl");
820 }
821 if (s_pfn_Get_Security_Descriptor_Dacl == NULL)
822 {
823 errno = ENOTSUP;
824 return FALSE;
825 }
826 return (s_pfn_Get_Security_Descriptor_Dacl (pSecurityDescriptor,
827 lpbDaclPresent, pDacl,
828 lpbDaclDefaulted));
829 }
830
831 static BOOL WINAPI
832 is_valid_sid (PSID sid)
833 {
834 static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
835 HMODULE hm_advapi32 = NULL;
836 if (is_windows_9x () == TRUE)
837 {
838 return FALSE;
839 }
840 if (g_b_init_is_valid_sid == 0)
841 {
842 g_b_init_is_valid_sid = 1;
843 hm_advapi32 = LoadLibrary ("Advapi32.dll");
844 s_pfn_Is_Valid_Sid =
845 (IsValidSid_Proc) GetProcAddress (
846 hm_advapi32, "IsValidSid");
847 }
848 if (s_pfn_Is_Valid_Sid == NULL)
849 {
850 return FALSE;
851 }
852 return (s_pfn_Is_Valid_Sid (sid));
853 }
854
855 static BOOL WINAPI
856 equal_sid (PSID sid1, PSID sid2)
857 {
858 static EqualSid_Proc s_pfn_Equal_Sid = NULL;
859 HMODULE hm_advapi32 = NULL;
860 if (is_windows_9x () == TRUE)
861 {
862 return FALSE;
863 }
864 if (g_b_init_equal_sid == 0)
865 {
866 g_b_init_equal_sid = 1;
867 hm_advapi32 = LoadLibrary ("Advapi32.dll");
868 s_pfn_Equal_Sid =
869 (EqualSid_Proc) GetProcAddress (
870 hm_advapi32, "EqualSid");
871 }
872 if (s_pfn_Equal_Sid == NULL)
873 {
874 return FALSE;
875 }
876 return (s_pfn_Equal_Sid (sid1, sid2));
877 }
878
879 static DWORD WINAPI
880 get_length_sid (PSID sid)
881 {
882 static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
883 HMODULE hm_advapi32 = NULL;
884 if (is_windows_9x () == TRUE)
885 {
886 return 0;
887 }
888 if (g_b_init_get_length_sid == 0)
889 {
890 g_b_init_get_length_sid = 1;
891 hm_advapi32 = LoadLibrary ("Advapi32.dll");
892 s_pfn_Get_Length_Sid =
893 (GetLengthSid_Proc) GetProcAddress (
894 hm_advapi32, "GetLengthSid");
895 }
896 if (s_pfn_Get_Length_Sid == NULL)
897 {
898 return 0;
899 }
900 return (s_pfn_Get_Length_Sid (sid));
901 }
902
903 static BOOL WINAPI
904 copy_sid (DWORD destlen, PSID dest, PSID src)
905 {
906 static CopySid_Proc s_pfn_Copy_Sid = NULL;
907 HMODULE hm_advapi32 = NULL;
908 if (is_windows_9x () == TRUE)
909 {
910 return FALSE;
911 }
912 if (g_b_init_copy_sid == 0)
913 {
914 g_b_init_copy_sid = 1;
915 hm_advapi32 = LoadLibrary ("Advapi32.dll");
916 s_pfn_Copy_Sid =
917 (CopySid_Proc) GetProcAddress (
918 hm_advapi32, "CopySid");
919 }
920 if (s_pfn_Copy_Sid == NULL)
921 {
922 return FALSE;
923 }
924 return (s_pfn_Copy_Sid (destlen, dest, src));
925 }
926
927 /*
928 END: Wrapper functions around OpenProcessToken
929 and other functions in advapi32.dll that are only
930 supported in Windows NT / 2k / XP
931 */
932
933 static void WINAPI
934 get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
935 {
936 static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
937 if (is_windows_9x () != TRUE)
938 {
939 if (g_b_init_get_native_system_info == 0)
940 {
941 g_b_init_get_native_system_info = 1;
942 s_pfn_Get_Native_System_Info =
943 (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
944 "GetNativeSystemInfo");
945 }
946 if (s_pfn_Get_Native_System_Info != NULL)
947 s_pfn_Get_Native_System_Info (lpSystemInfo);
948 }
949 else
950 lpSystemInfo->dwNumberOfProcessors = -1;
951 }
952
953 static BOOL WINAPI
954 get_system_times (LPFILETIME lpIdleTime,
955 LPFILETIME lpKernelTime,
956 LPFILETIME lpUserTime)
957 {
958 static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
959 if (is_windows_9x () == TRUE)
960 {
961 return FALSE;
962 }
963 if (g_b_init_get_system_times == 0)
964 {
965 g_b_init_get_system_times = 1;
966 s_pfn_Get_System_times =
967 (GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
968 "GetSystemTimes");
969 }
970 if (s_pfn_Get_System_times == NULL)
971 return FALSE;
972 return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
973 }
974
975 static BOOLEAN WINAPI
976 create_symbolic_link (LPTSTR lpSymlinkFilename,
977 LPTSTR lpTargetFileName,
978 DWORD dwFlags)
979 {
980 static CreateSymbolicLink_Proc s_pfn_Create_Symbolic_Link = NULL;
981 BOOLEAN retval;
982
983 if (is_windows_9x () == TRUE)
984 {
985 errno = ENOSYS;
986 return 0;
987 }
988 if (g_b_init_create_symbolic_link == 0)
989 {
990 g_b_init_create_symbolic_link = 1;
991 #ifdef _UNICODE
992 s_pfn_Create_Symbolic_Link =
993 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
994 "CreateSymbolicLinkW");
995 #else
996 s_pfn_Create_Symbolic_Link =
997 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
998 "CreateSymbolicLinkA");
999 #endif
1000 }
1001 if (s_pfn_Create_Symbolic_Link == NULL)
1002 {
1003 errno = ENOSYS;
1004 return 0;
1005 }
1006
1007 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
1008 dwFlags);
1009 /* If we were denied creation of the symlink, try again after
1010 enabling the SeCreateSymbolicLinkPrivilege for our process. */
1011 if (!retval)
1012 {
1013 TOKEN_PRIVILEGES priv_current;
1014
1015 if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE, &priv_current))
1016 {
1017 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
1018 dwFlags);
1019 restore_privilege (&priv_current);
1020 revert_to_self ();
1021 }
1022 }
1023 return retval;
1024 }
1025
1026 static BOOL WINAPI
1027 is_valid_security_descriptor (PSECURITY_DESCRIPTOR pSecurityDescriptor)
1028 {
1029 static IsValidSecurityDescriptor_Proc s_pfn_Is_Valid_Security_Descriptor_Proc = NULL;
1030
1031 if (is_windows_9x () == TRUE)
1032 {
1033 errno = ENOTSUP;
1034 return FALSE;
1035 }
1036
1037 if (g_b_init_is_valid_security_descriptor == 0)
1038 {
1039 g_b_init_is_valid_security_descriptor = 1;
1040 s_pfn_Is_Valid_Security_Descriptor_Proc =
1041 (IsValidSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1042 "IsValidSecurityDescriptor");
1043 }
1044 if (s_pfn_Is_Valid_Security_Descriptor_Proc == NULL)
1045 {
1046 errno = ENOTSUP;
1047 return FALSE;
1048 }
1049
1050 return s_pfn_Is_Valid_Security_Descriptor_Proc (pSecurityDescriptor);
1051 }
1052
1053 static BOOL WINAPI
1054 convert_sd_to_sddl (PSECURITY_DESCRIPTOR SecurityDescriptor,
1055 DWORD RequestedStringSDRevision,
1056 SECURITY_INFORMATION SecurityInformation,
1057 LPTSTR *StringSecurityDescriptor,
1058 PULONG StringSecurityDescriptorLen)
1059 {
1060 static ConvertSecurityDescriptorToStringSecurityDescriptor_Proc s_pfn_Convert_SD_To_SDDL = NULL;
1061 BOOL retval;
1062
1063 if (is_windows_9x () == TRUE)
1064 {
1065 errno = ENOTSUP;
1066 return FALSE;
1067 }
1068
1069 if (g_b_init_convert_sd_to_sddl == 0)
1070 {
1071 g_b_init_convert_sd_to_sddl = 1;
1072 #ifdef _UNICODE
1073 s_pfn_Convert_SD_To_SDDL =
1074 (ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1075 "ConvertSecurityDescriptorToStringSecurityDescriptorW");
1076 #else
1077 s_pfn_Convert_SD_To_SDDL =
1078 (ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1079 "ConvertSecurityDescriptorToStringSecurityDescriptorA");
1080 #endif
1081 }
1082 if (s_pfn_Convert_SD_To_SDDL == NULL)
1083 {
1084 errno = ENOTSUP;
1085 return FALSE;
1086 }
1087
1088 retval = s_pfn_Convert_SD_To_SDDL (SecurityDescriptor,
1089 RequestedStringSDRevision,
1090 SecurityInformation,
1091 StringSecurityDescriptor,
1092 StringSecurityDescriptorLen);
1093
1094 return retval;
1095 }
1096
1097 static BOOL WINAPI
1098 convert_sddl_to_sd (LPCTSTR StringSecurityDescriptor,
1099 DWORD StringSDRevision,
1100 PSECURITY_DESCRIPTOR *SecurityDescriptor,
1101 PULONG SecurityDescriptorSize)
1102 {
1103 static ConvertStringSecurityDescriptorToSecurityDescriptor_Proc s_pfn_Convert_SDDL_To_SD = NULL;
1104 BOOL retval;
1105
1106 if (is_windows_9x () == TRUE)
1107 {
1108 errno = ENOTSUP;
1109 return FALSE;
1110 }
1111
1112 if (g_b_init_convert_sddl_to_sd == 0)
1113 {
1114 g_b_init_convert_sddl_to_sd = 1;
1115 #ifdef _UNICODE
1116 s_pfn_Convert_SDDL_To_SD =
1117 (ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1118 "ConvertStringSecurityDescriptorToSecurityDescriptorW");
1119 #else
1120 s_pfn_Convert_SDDL_To_SD =
1121 (ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1122 "ConvertStringSecurityDescriptorToSecurityDescriptorA");
1123 #endif
1124 }
1125 if (s_pfn_Convert_SDDL_To_SD == NULL)
1126 {
1127 errno = ENOTSUP;
1128 return FALSE;
1129 }
1130
1131 retval = s_pfn_Convert_SDDL_To_SD (StringSecurityDescriptor,
1132 StringSDRevision,
1133 SecurityDescriptor,
1134 SecurityDescriptorSize);
1135
1136 return retval;
1137 }
1138
1139 static DWORD WINAPI
1140 get_adapters_info (PIP_ADAPTER_INFO pAdapterInfo, PULONG pOutBufLen)
1141 {
1142 static GetAdaptersInfo_Proc s_pfn_Get_Adapters_Info = NULL;
1143 HMODULE hm_iphlpapi = NULL;
1144
1145 if (is_windows_9x () == TRUE)
1146 return ERROR_NOT_SUPPORTED;
1147
1148 if (g_b_init_get_adapters_info == 0)
1149 {
1150 g_b_init_get_adapters_info = 1;
1151 hm_iphlpapi = LoadLibrary ("Iphlpapi.dll");
1152 if (hm_iphlpapi)
1153 s_pfn_Get_Adapters_Info = (GetAdaptersInfo_Proc)
1154 GetProcAddress (hm_iphlpapi, "GetAdaptersInfo");
1155 }
1156 if (s_pfn_Get_Adapters_Info == NULL)
1157 return ERROR_NOT_SUPPORTED;
1158 return s_pfn_Get_Adapters_Info (pAdapterInfo, pOutBufLen);
1159 }
1160
1161 \f
1162
1163 /* Return 1 if P is a valid pointer to an object of size SIZE. Return
1164 0 if P is NOT a valid pointer. Return -1 if we cannot validate P.
1165
1166 This is called from alloc.c:valid_pointer_p. */
1167 int
1168 w32_valid_pointer_p (void *p, int size)
1169 {
1170 SIZE_T done;
1171 HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());
1172
1173 if (h)
1174 {
1175 unsigned char *buf = alloca (size);
1176 int retval = ReadProcessMemory (h, p, buf, size, &done);
1177
1178 CloseHandle (h);
1179 return retval;
1180 }
1181 else
1182 return -1;
1183 }
1184
1185 \f
1186
1187 /* Converting file names from UTF-8 to either UTF-16 or the ANSI
1188 codepage defined by file-name-coding-system. */
1189
1190 /* Current codepage for encoding file names. */
1191 static int file_name_codepage;
1192
1193 /* Produce a Windows ANSI codepage suitable for encoding file names.
1194 Return the information about that codepage in CP_INFO. */
1195 static int
1196 codepage_for_filenames (CPINFO *cp_info)
1197 {
1198 /* A simple cache to avoid calling GetCPInfo every time we need to
1199 encode/decode a file name. The file-name encoding is not
1200 supposed to be changed too frequently, if ever. */
1201 static Lisp_Object last_file_name_encoding;
1202 static CPINFO cp;
1203 Lisp_Object current_encoding;
1204
1205 current_encoding = Vfile_name_coding_system;
1206 if (NILP (current_encoding))
1207 current_encoding = Vdefault_file_name_coding_system;
1208
1209 if (!EQ (last_file_name_encoding, current_encoding))
1210 {
1211 /* Default to the current ANSI codepage. */
1212 file_name_codepage = w32_ansi_code_page;
1213
1214 if (NILP (current_encoding))
1215 {
1216 char *cpname = SDATA (SYMBOL_NAME (current_encoding));
1217 char *cp = NULL, *end;
1218 int cpnum;
1219
1220 if (strncmp (cpname, "cp", 2) == 0)
1221 cp = cpname + 2;
1222 else if (strncmp (cpname, "windows-", 8) == 0)
1223 cp = cpname + 8;
1224
1225 if (cp)
1226 {
1227 end = cp;
1228 cpnum = strtol (cp, &end, 10);
1229 if (cpnum && *end == '\0' && end - cp >= 2)
1230 file_name_codepage = cpnum;
1231 }
1232 }
1233
1234 if (!file_name_codepage)
1235 file_name_codepage = CP_ACP; /* CP_ACP = 0, but let's not assume that */
1236
1237 if (!GetCPInfo (file_name_codepage, &cp))
1238 {
1239 file_name_codepage = CP_ACP;
1240 if (!GetCPInfo (file_name_codepage, &cp))
1241 emacs_abort ();
1242 }
1243 }
1244 if (cp_info)
1245 *cp_info = cp;
1246
1247 return file_name_codepage;
1248 }
1249
1250 static int
1251 filename_to_utf16 (const char *fn_in, wchar_t *fn_out)
1252 {
1253 int result = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, fn_in, -1,
1254 fn_out, MAX_PATH);
1255
1256 if (!result)
1257 {
1258 DWORD err = GetLastError ();
1259
1260 switch (err)
1261 {
1262 case ERROR_INVALID_FLAGS:
1263 case ERROR_INVALID_PARAMETER:
1264 errno = EINVAL;
1265 break;
1266 case ERROR_INSUFFICIENT_BUFFER:
1267 case ERROR_NO_UNICODE_TRANSLATION:
1268 default:
1269 errno = ENOENT;
1270 break;
1271 }
1272 return -1;
1273 }
1274 return 0;
1275 }
1276
1277 static int
1278 filename_from_utf16 (const wchar_t *fn_in, char *fn_out)
1279 {
1280 int result = WideCharToMultiByte (CP_UTF8, 0, fn_in, -1,
1281 fn_out, MAX_UTF8_PATH, NULL, NULL);
1282
1283 if (!result)
1284 {
1285 DWORD err = GetLastError ();
1286
1287 switch (err)
1288 {
1289 case ERROR_INVALID_FLAGS:
1290 case ERROR_INVALID_PARAMETER:
1291 errno = EINVAL;
1292 break;
1293 case ERROR_INSUFFICIENT_BUFFER:
1294 case ERROR_NO_UNICODE_TRANSLATION:
1295 default:
1296 errno = ENOENT;
1297 break;
1298 }
1299 return -1;
1300 }
1301 return 0;
1302 }
1303
1304 static int
1305 filename_to_ansi (const char *fn_in, char *fn_out)
1306 {
1307 wchar_t fn_utf16[MAX_PATH];
1308
1309 if (filename_to_utf16 (fn_in, fn_utf16) == 0)
1310 {
1311 int result;
1312 int codepage = codepage_for_filenames (NULL);
1313
1314 result = WideCharToMultiByte (codepage, 0, fn_utf16, -1,
1315 fn_out, MAX_PATH, NULL, NULL);
1316 if (!result)
1317 {
1318 DWORD err = GetLastError ();
1319
1320 switch (err)
1321 {
1322 case ERROR_INVALID_FLAGS:
1323 case ERROR_INVALID_PARAMETER:
1324 errno = EINVAL;
1325 break;
1326 case ERROR_INSUFFICIENT_BUFFER:
1327 case ERROR_NO_UNICODE_TRANSLATION:
1328 default:
1329 errno = ENOENT;
1330 break;
1331 }
1332 return -1;
1333 }
1334 return 0;
1335 }
1336 return -1;
1337 }
1338
1339 int
1340 filename_from_ansi (const char *fn_in, char *fn_out)
1341 {
1342 wchar_t fn_utf16[MAX_PATH];
1343 int codepage = codepage_for_filenames (NULL);
1344 int result = MultiByteToWideChar (codepage, MB_ERR_INVALID_CHARS, fn_in, -1,
1345 fn_utf16, MAX_PATH);
1346
1347 if (!result)
1348 {
1349 DWORD err = GetLastError ();
1350
1351 switch (err)
1352 {
1353 case ERROR_INVALID_FLAGS:
1354 case ERROR_INVALID_PARAMETER:
1355 errno = EINVAL;
1356 break;
1357 case ERROR_INSUFFICIENT_BUFFER:
1358 case ERROR_NO_UNICODE_TRANSLATION:
1359 default:
1360 errno = ENOENT;
1361 break;
1362 }
1363 return -1;
1364 }
1365 return filename_from_utf16 (fn_utf16, fn_out);
1366 }
1367
1368 \f
1369
1370 /* The directory where we started, in UTF-8. */
1371 static char startup_dir[MAX_UTF8_PATH];
1372
1373 /* Get the current working directory. */
1374 char *
1375 getcwd (char *dir, int dirsize)
1376 {
1377 if (!dirsize)
1378 {
1379 errno = EINVAL;
1380 return NULL;
1381 }
1382 if (dirsize <= strlen (startup_dir))
1383 {
1384 errno = ERANGE;
1385 return NULL;
1386 }
1387 #if 0
1388 if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
1389 return dir;
1390 return NULL;
1391 #else
1392 /* Emacs doesn't actually change directory itself, it stays in the
1393 same directory where it was started. */
1394 strcpy (dir, startup_dir);
1395 return dir;
1396 #endif
1397 }
1398
1399 /* Emulate getloadavg. */
1400
1401 struct load_sample {
1402 time_t sample_time;
1403 ULONGLONG idle;
1404 ULONGLONG kernel;
1405 ULONGLONG user;
1406 };
1407
1408 /* Number of processors on this machine. */
1409 static unsigned num_of_processors;
1410
1411 /* We maintain 1-sec samples for the last 16 minutes in a circular buffer. */
1412 static struct load_sample samples[16*60];
1413 static int first_idx = -1, last_idx = -1;
1414 static int max_idx = sizeof (samples) / sizeof (samples[0]);
1415
1416 static int
1417 buf_next (int from)
1418 {
1419 int next_idx = from + 1;
1420
1421 if (next_idx >= max_idx)
1422 next_idx = 0;
1423
1424 return next_idx;
1425 }
1426
1427 static int
1428 buf_prev (int from)
1429 {
1430 int prev_idx = from - 1;
1431
1432 if (prev_idx < 0)
1433 prev_idx = max_idx - 1;
1434
1435 return prev_idx;
1436 }
1437
1438 static void
1439 sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
1440 {
1441 SYSTEM_INFO sysinfo;
1442 FILETIME ft_idle, ft_user, ft_kernel;
1443
1444 /* Initialize the number of processors on this machine. */
1445 if (num_of_processors <= 0)
1446 {
1447 get_native_system_info (&sysinfo);
1448 num_of_processors = sysinfo.dwNumberOfProcessors;
1449 if (num_of_processors <= 0)
1450 {
1451 GetSystemInfo (&sysinfo);
1452 num_of_processors = sysinfo.dwNumberOfProcessors;
1453 }
1454 if (num_of_processors <= 0)
1455 num_of_processors = 1;
1456 }
1457
1458 /* TODO: Take into account threads that are ready to run, by
1459 sampling the "\System\Processor Queue Length" performance
1460 counter. The code below accounts only for threads that are
1461 actually running. */
1462
1463 if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
1464 {
1465 ULARGE_INTEGER uidle, ukernel, uuser;
1466
1467 memcpy (&uidle, &ft_idle, sizeof (ft_idle));
1468 memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
1469 memcpy (&uuser, &ft_user, sizeof (ft_user));
1470 *idle = uidle.QuadPart;
1471 *kernel = ukernel.QuadPart;
1472 *user = uuser.QuadPart;
1473 }
1474 else
1475 {
1476 *idle = 0;
1477 *kernel = 0;
1478 *user = 0;
1479 }
1480 }
1481
1482 /* Produce the load average for a given time interval, using the
1483 samples in the samples[] array. WHICH can be 0, 1, or 2, meaning
1484 1-minute, 5-minute, or 15-minute average, respectively. */
1485 static double
1486 getavg (int which)
1487 {
1488 double retval = -1.0;
1489 double tdiff;
1490 int idx;
1491 double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
1492 time_t now = samples[last_idx].sample_time;
1493
1494 if (first_idx != last_idx)
1495 {
1496 for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
1497 {
1498 tdiff = difftime (now, samples[idx].sample_time);
1499 if (tdiff >= span - 2*DBL_EPSILON*now)
1500 {
1501 long double sys =
1502 samples[last_idx].kernel + samples[last_idx].user
1503 - (samples[idx].kernel + samples[idx].user);
1504 long double idl = samples[last_idx].idle - samples[idx].idle;
1505
1506 retval = (1.0 - idl / sys) * num_of_processors;
1507 break;
1508 }
1509 if (idx == first_idx)
1510 break;
1511 }
1512 }
1513
1514 return retval;
1515 }
1516
1517 int
1518 getloadavg (double loadavg[], int nelem)
1519 {
1520 int elem;
1521 ULONGLONG idle, kernel, user;
1522 time_t now = time (NULL);
1523
1524 /* Store another sample. We ignore samples that are less than 1 sec
1525 apart. */
1526 if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
1527 {
1528 sample_system_load (&idle, &kernel, &user);
1529 last_idx = buf_next (last_idx);
1530 samples[last_idx].sample_time = now;
1531 samples[last_idx].idle = idle;
1532 samples[last_idx].kernel = kernel;
1533 samples[last_idx].user = user;
1534 /* If the buffer has more that 15 min worth of samples, discard
1535 the old ones. */
1536 if (first_idx == -1)
1537 first_idx = last_idx;
1538 while (first_idx != last_idx
1539 && (difftime (now, samples[first_idx].sample_time)
1540 >= 15.0*60 + 2*DBL_EPSILON*now))
1541 first_idx = buf_next (first_idx);
1542 }
1543
1544 for (elem = 0; elem < nelem; elem++)
1545 {
1546 double avg = getavg (elem);
1547
1548 if (avg < 0)
1549 break;
1550 loadavg[elem] = avg;
1551 }
1552
1553 return elem;
1554 }
1555
1556 /* Emulate getpwuid, getpwnam and others. */
1557
1558 #define PASSWD_FIELD_SIZE 256
1559
1560 static char dflt_passwd_name[PASSWD_FIELD_SIZE];
1561 static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
1562 static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
1563 static char dflt_passwd_dir[MAX_UTF8_PATH];
1564 static char dflt_passwd_shell[MAX_UTF8_PATH];
1565
1566 static struct passwd dflt_passwd =
1567 {
1568 dflt_passwd_name,
1569 dflt_passwd_passwd,
1570 0,
1571 0,
1572 0,
1573 dflt_passwd_gecos,
1574 dflt_passwd_dir,
1575 dflt_passwd_shell,
1576 };
1577
1578 static char dflt_group_name[GNLEN+1];
1579
1580 static struct group dflt_group =
1581 {
1582 /* When group information is not available, we return this as the
1583 group for all files. */
1584 dflt_group_name,
1585 0,
1586 };
1587
1588 unsigned
1589 getuid (void)
1590 {
1591 return dflt_passwd.pw_uid;
1592 }
1593
1594 unsigned
1595 geteuid (void)
1596 {
1597 /* I could imagine arguing for checking to see whether the user is
1598 in the Administrators group and returning a UID of 0 for that
1599 case, but I don't know how wise that would be in the long run. */
1600 return getuid ();
1601 }
1602
1603 unsigned
1604 getgid (void)
1605 {
1606 return dflt_passwd.pw_gid;
1607 }
1608
1609 unsigned
1610 getegid (void)
1611 {
1612 return getgid ();
1613 }
1614
1615 struct passwd *
1616 getpwuid (unsigned uid)
1617 {
1618 if (uid == dflt_passwd.pw_uid)
1619 return &dflt_passwd;
1620 return NULL;
1621 }
1622
1623 struct group *
1624 getgrgid (gid_t gid)
1625 {
1626 return &dflt_group;
1627 }
1628
1629 struct passwd *
1630 getpwnam (char *name)
1631 {
1632 struct passwd *pw;
1633
1634 pw = getpwuid (getuid ());
1635 if (!pw)
1636 return pw;
1637
1638 if (xstrcasecmp (name, pw->pw_name))
1639 return NULL;
1640
1641 return pw;
1642 }
1643
1644 static void
1645 init_user_info (void)
1646 {
1647 /* Find the user's real name by opening the process token and
1648 looking up the name associated with the user-sid in that token.
1649
1650 Use the relative portion of the identifier authority value from
1651 the user-sid as the user id value (same for group id using the
1652 primary group sid from the process token). */
1653
1654 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
1655 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
1656 DWORD glength = sizeof (gname);
1657 HANDLE token = NULL;
1658 SID_NAME_USE user_type;
1659 unsigned char *buf = NULL;
1660 DWORD blen = 0;
1661 TOKEN_USER user_token;
1662 TOKEN_PRIMARY_GROUP group_token;
1663 BOOL result;
1664
1665 result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
1666 if (result)
1667 {
1668 result = get_token_information (token, TokenUser, NULL, 0, &blen);
1669 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1670 {
1671 buf = xmalloc (blen);
1672 result = get_token_information (token, TokenUser,
1673 (LPVOID)buf, blen, &needed);
1674 if (result)
1675 {
1676 memcpy (&user_token, buf, sizeof (user_token));
1677 result = lookup_account_sid (NULL, user_token.User.Sid,
1678 uname, &ulength,
1679 domain, &dlength, &user_type);
1680 }
1681 }
1682 else
1683 result = FALSE;
1684 }
1685 if (result)
1686 {
1687 strcpy (dflt_passwd.pw_name, uname);
1688 /* Determine a reasonable uid value. */
1689 if (xstrcasecmp ("administrator", uname) == 0)
1690 {
1691 dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
1692 dflt_passwd.pw_gid = 513; /* well-known None gid */
1693 }
1694 else
1695 {
1696 /* Use the last sub-authority value of the RID, the relative
1697 portion of the SID, as user/group ID. */
1698 dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
1699
1700 /* Get group id and name. */
1701 result = get_token_information (token, TokenPrimaryGroup,
1702 (LPVOID)buf, blen, &needed);
1703 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1704 {
1705 buf = xrealloc (buf, blen = needed);
1706 result = get_token_information (token, TokenPrimaryGroup,
1707 (LPVOID)buf, blen, &needed);
1708 }
1709 if (result)
1710 {
1711 memcpy (&group_token, buf, sizeof (group_token));
1712 dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
1713 dlength = sizeof (domain);
1714 /* If we can get at the real Primary Group name, use that.
1715 Otherwise, the default group name was already set to
1716 "None" in globals_of_w32. */
1717 if (lookup_account_sid (NULL, group_token.PrimaryGroup,
1718 gname, &glength, NULL, &dlength,
1719 &user_type))
1720 strcpy (dflt_group_name, gname);
1721 }
1722 else
1723 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1724 }
1725 }
1726 /* If security calls are not supported (presumably because we
1727 are running under Windows 9X), fallback to this: */
1728 else if (GetUserName (uname, &ulength))
1729 {
1730 strcpy (dflt_passwd.pw_name, uname);
1731 if (xstrcasecmp ("administrator", uname) == 0)
1732 dflt_passwd.pw_uid = 0;
1733 else
1734 dflt_passwd.pw_uid = 123;
1735 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1736 }
1737 else
1738 {
1739 strcpy (dflt_passwd.pw_name, "unknown");
1740 dflt_passwd.pw_uid = 123;
1741 dflt_passwd.pw_gid = 123;
1742 }
1743 dflt_group.gr_gid = dflt_passwd.pw_gid;
1744
1745 /* Set dir and shell from environment variables. */
1746 if (w32_unicode_filenames)
1747 {
1748 wchar_t *home = _wgetenv (L"HOME");
1749 wchar_t *shell = _wgetenv (L"SHELL");
1750
1751 /* Ensure HOME and SHELL are defined. */
1752 if (home == NULL)
1753 emacs_abort ();
1754 if (shell == NULL)
1755 emacs_abort ();
1756 filename_from_utf16 (home, dflt_passwd.pw_dir);
1757 filename_from_utf16 (shell, dflt_passwd.pw_shell);
1758 }
1759 else
1760 {
1761 char *home = getenv ("HOME");
1762 char *shell = getenv ("SHELL");
1763
1764 if (home == NULL)
1765 emacs_abort ();
1766 if (shell == NULL)
1767 emacs_abort ();
1768 filename_from_ansi (home, dflt_passwd.pw_dir);
1769 filename_from_ansi (shell, dflt_passwd.pw_shell);
1770 }
1771
1772 xfree (buf);
1773 if (token)
1774 CloseHandle (token);
1775 }
1776
1777 int
1778 random (void)
1779 {
1780 /* rand () on NT gives us 15 random bits...hack together 30 bits. */
1781 return ((rand () << 15) | rand ());
1782 }
1783
1784 void
1785 srandom (int seed)
1786 {
1787 srand (seed);
1788 }
1789
1790 /* Return the maximum length in bytes of a multibyte character
1791 sequence encoded in the current ANSI codepage. This is required to
1792 correctly walk the encoded file names one character at a time. */
1793 static int
1794 max_filename_mbslen (void)
1795 {
1796 CPINFO cp_info;
1797
1798 codepage_for_filenames (&cp_info);
1799 return cp_info.MaxCharSize;
1800 }
1801
1802 /* Normalize filename by converting in-place all of its path
1803 separators to the separator specified by PATH_SEP. */
1804
1805 static void
1806 normalize_filename (register char *fp, char path_sep)
1807 {
1808 char *p2;
1809
1810 /* Always lower-case drive letters a-z, even if the filesystem
1811 preserves case in filenames.
1812 This is so filenames can be compared by string comparison
1813 functions that are case-sensitive. Even case-preserving filesystems
1814 do not distinguish case in drive letters. */
1815 p2 = fp + 1;
1816
1817 if (*p2 == ':' && *fp >= 'A' && *fp <= 'Z')
1818 {
1819 *fp += 'a' - 'A';
1820 fp += 2;
1821 }
1822
1823 while (*fp)
1824 {
1825 if (*fp == '/' || *fp == '\\')
1826 *fp = path_sep;
1827 fp++;
1828 }
1829 }
1830
1831 /* Destructively turn backslashes into slashes. */
1832 void
1833 dostounix_filename (register char *p)
1834 {
1835 normalize_filename (p, '/');
1836 }
1837
1838 /* Destructively turn slashes into backslashes. */
1839 void
1840 unixtodos_filename (register char *p)
1841 {
1842 normalize_filename (p, '\\');
1843 }
1844
1845 /* Remove all CR's that are followed by a LF.
1846 (From msdos.c...probably should figure out a way to share it,
1847 although this code isn't going to ever change.) */
1848 static int
1849 crlf_to_lf (register int n, register unsigned char *buf)
1850 {
1851 unsigned char *np = buf;
1852 unsigned char *startp = buf;
1853 unsigned char *endp = buf + n;
1854
1855 if (n == 0)
1856 return n;
1857 while (buf < endp - 1)
1858 {
1859 if (*buf == 0x0d)
1860 {
1861 if (*(++buf) != 0x0a)
1862 *np++ = 0x0d;
1863 }
1864 else
1865 *np++ = *buf++;
1866 }
1867 if (buf < endp)
1868 *np++ = *buf++;
1869 return np - startp;
1870 }
1871
1872 /* Parse the root part of file name, if present. Return length and
1873 optionally store pointer to char after root. */
1874 static int
1875 parse_root (const char * name, const char ** pPath)
1876 {
1877 const char * start = name;
1878
1879 if (name == NULL)
1880 return 0;
1881
1882 /* find the root name of the volume if given */
1883 if (isalpha (name[0]) && name[1] == ':')
1884 {
1885 /* skip past drive specifier */
1886 name += 2;
1887 if (IS_DIRECTORY_SEP (name[0]))
1888 name++;
1889 }
1890 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
1891 {
1892 int slashes = 2;
1893
1894 name += 2;
1895 do
1896 {
1897 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
1898 break;
1899 name++;
1900 }
1901 while ( *name );
1902 if (IS_DIRECTORY_SEP (name[0]))
1903 name++;
1904 }
1905
1906 if (pPath)
1907 *pPath = name;
1908
1909 return name - start;
1910 }
1911
1912 /* Get long base name for name; name is assumed to be absolute. */
1913 static int
1914 get_long_basename (char * name, char * buf, int size)
1915 {
1916 HANDLE dir_handle;
1917 char fname_utf8[MAX_UTF8_PATH];
1918 int len = 0;
1919 int cstatus;
1920
1921 /* Must be valid filename, no wild cards or other invalid characters. */
1922 if (strpbrk (name, "*?|<>\""))
1923 return 0;
1924
1925 if (w32_unicode_filenames)
1926 {
1927 wchar_t fname_utf16[MAX_PATH];
1928 WIN32_FIND_DATAW find_data_wide;
1929
1930 filename_to_utf16 (name, fname_utf16);
1931 dir_handle = FindFirstFileW (fname_utf16, &find_data_wide);
1932 if (dir_handle != INVALID_HANDLE_VALUE)
1933 cstatus = filename_from_utf16 (find_data_wide.cFileName, fname_utf8);
1934 }
1935 else
1936 {
1937 char fname_ansi[MAX_PATH];
1938 WIN32_FIND_DATAA find_data_ansi;
1939
1940 filename_to_ansi (name, fname_ansi);
1941 dir_handle = FindFirstFileA (fname_ansi, &find_data_ansi);
1942 if (dir_handle != INVALID_HANDLE_VALUE)
1943 cstatus = filename_from_ansi (find_data_ansi.cFileName, fname_utf8);
1944 }
1945
1946 if (cstatus == 0 && (len = strlen (fname_utf8)) < size)
1947 memcpy (buf, fname_utf8, len + 1);
1948 else
1949 len = 0;
1950
1951 if (dir_handle != INVALID_HANDLE_VALUE)
1952 FindClose (dir_handle);
1953
1954 return len;
1955 }
1956
1957 /* Get long name for file, if possible (assumed to be absolute). */
1958 BOOL
1959 w32_get_long_filename (char * name, char * buf, int size)
1960 {
1961 char * o = buf;
1962 char * p;
1963 const char * q;
1964 char full[ MAX_UTF8_PATH ];
1965 int len;
1966
1967 len = strlen (name);
1968 if (len >= MAX_UTF8_PATH)
1969 return FALSE;
1970
1971 /* Use local copy for destructive modification. */
1972 memcpy (full, name, len+1);
1973 unixtodos_filename (full);
1974
1975 /* Copy root part verbatim. */
1976 len = parse_root (full, (const char **)&p);
1977 memcpy (o, full, len);
1978 o += len;
1979 *o = '\0';
1980 size -= len;
1981
1982 while (p != NULL && *p)
1983 {
1984 q = p;
1985 p = strchr (q, '\\');
1986 if (p) *p = '\0';
1987 len = get_long_basename (full, o, size);
1988 if (len > 0)
1989 {
1990 o += len;
1991 size -= len;
1992 if (p != NULL)
1993 {
1994 *p++ = '\\';
1995 if (size < 2)
1996 return FALSE;
1997 *o++ = '\\';
1998 size--;
1999 *o = '\0';
2000 }
2001 }
2002 else
2003 return FALSE;
2004 }
2005
2006 return TRUE;
2007 }
2008
2009 unsigned int
2010 w32_get_short_filename (char * name, char * buf, int size)
2011 {
2012 if (w32_unicode_filenames)
2013 {
2014 wchar_t name_utf16[MAX_PATH], short_name[MAX_PATH];
2015 unsigned int retval;
2016
2017 filename_to_utf16 (name, name_utf16);
2018 retval = GetShortPathNameW (name_utf16, short_name, size);
2019 if (retval && retval < size)
2020 filename_from_utf16 (short_name, buf);
2021 return retval;
2022 }
2023 else
2024 {
2025 char name_ansi[MAX_PATH];
2026
2027 filename_to_ansi (name, name_ansi);
2028 return GetShortPathNameA (name_ansi, buf, size);
2029 }
2030 }
2031
2032 static int
2033 is_unc_volume (const char *filename)
2034 {
2035 const char *ptr = filename;
2036
2037 if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
2038 return 0;
2039
2040 if (strpbrk (ptr + 2, "*?|<>\"\\/"))
2041 return 0;
2042
2043 return 1;
2044 }
2045
2046 /* Emulate the Posix unsetenv. */
2047 int
2048 unsetenv (const char *name)
2049 {
2050 char *var;
2051 size_t name_len;
2052 int retval;
2053
2054 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
2055 {
2056 errno = EINVAL;
2057 return -1;
2058 }
2059 name_len = strlen (name);
2060 /* MS docs says an environment variable cannot be longer than 32K. */
2061 if (name_len > 32767)
2062 {
2063 errno = ENOMEM;
2064 return 0;
2065 }
2066 /* It is safe to use 'alloca' with 32K size, since the stack is at
2067 least 2MB, and we set it to 8MB in the link command line. */
2068 var = alloca (name_len + 2);
2069 strncpy (var, name, name_len);
2070 var[name_len++] = '=';
2071 var[name_len] = '\0';
2072 return _putenv (var);
2073 }
2074
2075 /* MS _putenv doesn't support removing a variable when the argument
2076 does not include the '=' character, so we fix that here. */
2077 int
2078 sys_putenv (char *str)
2079 {
2080 const char *const name_end = strchr (str, '=');
2081
2082 if (name_end == NULL)
2083 {
2084 /* Remove the variable from the environment. */
2085 return unsetenv (str);
2086 }
2087
2088 return _putenv (str);
2089 }
2090
2091 #define REG_ROOT "SOFTWARE\\GNU\\Emacs"
2092
2093 LPBYTE
2094 w32_get_resource (char *key, LPDWORD lpdwtype)
2095 {
2096 LPBYTE lpvalue;
2097 HKEY hrootkey = NULL;
2098 DWORD cbData;
2099
2100 /* Check both the current user and the local machine to see if
2101 we have any resources. */
2102
2103 if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
2104 {
2105 lpvalue = NULL;
2106
2107 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
2108 && (lpvalue = xmalloc (cbData)) != NULL
2109 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
2110 {
2111 RegCloseKey (hrootkey);
2112 return (lpvalue);
2113 }
2114
2115 xfree (lpvalue);
2116
2117 RegCloseKey (hrootkey);
2118 }
2119
2120 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
2121 {
2122 lpvalue = NULL;
2123
2124 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
2125 && (lpvalue = xmalloc (cbData)) != NULL
2126 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
2127 {
2128 RegCloseKey (hrootkey);
2129 return (lpvalue);
2130 }
2131
2132 xfree (lpvalue);
2133
2134 RegCloseKey (hrootkey);
2135 }
2136
2137 return (NULL);
2138 }
2139
2140 void
2141 init_environment (char ** argv)
2142 {
2143 static const char * const tempdirs[] = {
2144 "$TMPDIR", "$TEMP", "$TMP", "c:/"
2145 };
2146
2147 int i;
2148
2149 const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);
2150
2151 /* Implementation note: This function explicitly works with ANSI
2152 file names, not with UTF-8 encoded file names. This is because
2153 this function pushes variables into the Emacs's environment, and
2154 the environment variables are always assumed to be in the
2155 locale-specific encoding. Do NOT call any functions that accept
2156 UTF-8 file names from this function! */
2157
2158 /* Make sure they have a usable $TMPDIR. Many Emacs functions use
2159 temporary files and assume "/tmp" if $TMPDIR is unset, which
2160 will break on DOS/Windows. Refuse to work if we cannot find
2161 a directory, not even "c:/", usable for that purpose. */
2162 for (i = 0; i < imax ; i++)
2163 {
2164 const char *tmp = tempdirs[i];
2165
2166 if (*tmp == '$')
2167 tmp = getenv (tmp + 1);
2168 /* Note that `access' can lie to us if the directory resides on a
2169 read-only filesystem, like CD-ROM or a write-protected floppy.
2170 The only way to be really sure is to actually create a file and
2171 see if it succeeds. But I think that's too much to ask. */
2172
2173 /* MSVCRT's _access crashes with D_OK, so we use our replacement. */
2174 if (tmp && sys_access (tmp, D_OK) == 0)
2175 {
2176 char * var = alloca (strlen (tmp) + 8);
2177 sprintf (var, "TMPDIR=%s", tmp);
2178 _putenv (strdup (var));
2179 break;
2180 }
2181 }
2182 if (i >= imax)
2183 cmd_error_internal
2184 (Fcons (Qerror,
2185 Fcons (build_string ("no usable temporary directories found!!"),
2186 Qnil)),
2187 "While setting TMPDIR: ");
2188
2189 /* Check for environment variables and use registry settings if they
2190 don't exist. Fallback on default values where applicable. */
2191 {
2192 int i;
2193 LPBYTE lpval;
2194 DWORD dwType;
2195 char locale_name[32];
2196 char default_home[MAX_PATH];
2197 int appdata = 0;
2198
2199 static const struct env_entry
2200 {
2201 char * name;
2202 char * def_value;
2203 } dflt_envvars[] =
2204 {
2205 /* If the default value is NULL, we will use the value from the
2206 outside environment or the Registry, but will not push the
2207 variable into the Emacs environment if it is defined neither
2208 in the Registry nor in the outside environment. */
2209 {"HOME", "C:/"},
2210 {"PRELOAD_WINSOCK", NULL},
2211 {"emacs_dir", "C:/emacs"},
2212 {"EMACSLOADPATH", NULL},
2213 {"SHELL", "cmdproxy.exe"}, /* perhaps it is somewhere on PATH */
2214 {"EMACSDATA", NULL},
2215 {"EMACSPATH", NULL},
2216 {"INFOPATH", NULL},
2217 {"EMACSDOC", NULL},
2218 {"TERM", "cmd"},
2219 {"LANG", NULL},
2220 };
2221
2222 #define N_ENV_VARS sizeof (dflt_envvars)/sizeof (dflt_envvars[0])
2223
2224 /* We need to copy dflt_envvars[] and work on the copy because we
2225 don't want the dumped Emacs to inherit the values of
2226 environment variables we saw during dumping (which could be on
2227 a different system). The defaults above must be left intact. */
2228 struct env_entry env_vars[N_ENV_VARS];
2229
2230 for (i = 0; i < N_ENV_VARS; i++)
2231 env_vars[i] = dflt_envvars[i];
2232
2233 /* For backwards compatibility, check if a .emacs file exists in C:/
2234 If not, then we can try to default to the appdata directory under the
2235 user's profile, which is more likely to be writable. */
2236 if (sys_access ("C:/.emacs", F_OK) != 0)
2237 {
2238 HRESULT profile_result;
2239 /* Dynamically load ShGetFolderPath, as it won't exist on versions
2240 of Windows 95 and NT4 that have not been updated to include
2241 MSIE 5. */
2242 ShGetFolderPath_fn get_folder_path;
2243 get_folder_path = (ShGetFolderPath_fn)
2244 GetProcAddress (GetModuleHandle ("shell32.dll"), "SHGetFolderPathA");
2245
2246 if (get_folder_path != NULL)
2247 {
2248 profile_result = get_folder_path (NULL, CSIDL_APPDATA, NULL,
2249 0, default_home);
2250
2251 /* If we can't get the appdata dir, revert to old behavior. */
2252 if (profile_result == S_OK)
2253 {
2254 env_vars[0].def_value = default_home;
2255 appdata = 1;
2256 }
2257 }
2258 }
2259
2260 /* Get default locale info and use it for LANG. */
2261 if (GetLocaleInfo (LOCALE_USER_DEFAULT,
2262 LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
2263 locale_name, sizeof (locale_name)))
2264 {
2265 for (i = 0; i < N_ENV_VARS; i++)
2266 {
2267 if (strcmp (env_vars[i].name, "LANG") == 0)
2268 {
2269 env_vars[i].def_value = locale_name;
2270 break;
2271 }
2272 }
2273 }
2274
2275 #define SET_ENV_BUF_SIZE (4 * MAX_PATH) /* to cover EMACSLOADPATH */
2276
2277 /* Treat emacs_dir specially: set it unconditionally based on our
2278 location. */
2279 {
2280 char *p;
2281 char modname[MAX_PATH];
2282
2283 if (!GetModuleFileName (NULL, modname, MAX_PATH))
2284 emacs_abort ();
2285 if ((p = _mbsrchr (modname, '\\')) == NULL)
2286 emacs_abort ();
2287 *p = 0;
2288
2289 if ((p = _mbsrchr (modname, '\\'))
2290 /* From bin means installed Emacs, from src means uninstalled. */
2291 && (xstrcasecmp (p, "\\bin") == 0 || xstrcasecmp (p, "\\src") == 0))
2292 {
2293 char buf[SET_ENV_BUF_SIZE];
2294 int within_build_tree = xstrcasecmp (p, "\\src") == 0;
2295
2296 *p = 0;
2297 for (p = modname; *p; p = CharNext (p))
2298 if (*p == '\\') *p = '/';
2299
2300 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
2301 _putenv (strdup (buf));
2302 /* If we are running from the Posix-like build tree, define
2303 SHELL to point to our own cmdproxy. The loop below will
2304 then disregard PATH_EXEC and the default value. */
2305 if (within_build_tree)
2306 {
2307 _snprintf (buf, sizeof (buf) - 1,
2308 "SHELL=%s/nt/cmdproxy.exe", modname);
2309 _putenv (strdup (buf));
2310 }
2311 }
2312 }
2313
2314 for (i = 0; i < N_ENV_VARS; i++)
2315 {
2316 if (!getenv (env_vars[i].name))
2317 {
2318 int dont_free = 0;
2319 char bufc[SET_ENV_BUF_SIZE];
2320
2321 if ((lpval = w32_get_resource (env_vars[i].name, &dwType)) == NULL
2322 /* Also ignore empty environment variables. */
2323 || *lpval == 0)
2324 {
2325 xfree (lpval);
2326 dont_free = 1;
2327 if (strcmp (env_vars[i].name, "SHELL") == 0)
2328 {
2329 /* Look for cmdproxy.exe in every directory in
2330 PATH_EXEC. FIXME: This does not find cmdproxy
2331 in nt/ when we run uninstalled. */
2332 char fname[MAX_PATH];
2333 const char *pstart = PATH_EXEC, *pend;
2334
2335 do {
2336 pend = _mbschr (pstart, ';');
2337 if (!pend)
2338 pend = pstart + strlen (pstart);
2339 /* Be defensive against series of ;;; characters. */
2340 if (pend > pstart)
2341 {
2342 strncpy (fname, pstart, pend - pstart);
2343 fname[pend - pstart] = '/';
2344 strcpy (&fname[pend - pstart + 1], "cmdproxy.exe");
2345 ExpandEnvironmentStrings ((LPSTR) fname, bufc,
2346 sizeof (bufc));
2347 if (sys_access (bufc, F_OK) == 0)
2348 {
2349 lpval = bufc;
2350 dwType = REG_SZ;
2351 break;
2352 }
2353 }
2354 if (*pend)
2355 pstart = pend + 1;
2356 else
2357 pstart = pend;
2358 if (!*pstart)
2359 {
2360 /* If not found in any directory, use the
2361 default as the last resort. */
2362 lpval = env_vars[i].def_value;
2363 dwType = REG_EXPAND_SZ;
2364 }
2365 } while (*pstart);
2366 }
2367 else
2368 {
2369 lpval = env_vars[i].def_value;
2370 dwType = REG_EXPAND_SZ;
2371 }
2372 if (strcmp (env_vars[i].name, "HOME") == 0 && !appdata)
2373 Vdelayed_warnings_list
2374 = Fcons (listn (CONSTYPE_HEAP, 2,
2375 intern ("initialization"),
2376 build_string ("Setting HOME to C:\\ by default is deprecated")),
2377 Vdelayed_warnings_list);
2378 }
2379
2380 if (lpval)
2381 {
2382 char buf1[SET_ENV_BUF_SIZE], buf2[SET_ENV_BUF_SIZE];
2383
2384 if (dwType == REG_EXPAND_SZ)
2385 ExpandEnvironmentStrings ((LPSTR) lpval, buf1, sizeof (buf1));
2386 else if (dwType == REG_SZ)
2387 strcpy (buf1, lpval);
2388 if (dwType == REG_EXPAND_SZ || dwType == REG_SZ)
2389 {
2390 _snprintf (buf2, sizeof (buf2)-1, "%s=%s", env_vars[i].name,
2391 buf1);
2392 _putenv (strdup (buf2));
2393 }
2394
2395 if (!dont_free)
2396 xfree (lpval);
2397 }
2398 }
2399 }
2400 }
2401
2402 /* Rebuild system configuration to reflect invoking system. */
2403 Vsystem_configuration = build_string (EMACS_CONFIGURATION);
2404
2405 /* Another special case: on NT, the PATH variable is actually named
2406 "Path" although cmd.exe (perhaps NT itself) arranges for
2407 environment variable lookup and setting to be case insensitive.
2408 However, Emacs assumes a fully case sensitive environment, so we
2409 need to change "Path" to "PATH" to match the expectations of
2410 various elisp packages. We do this by the sneaky method of
2411 modifying the string in the C runtime environ entry.
2412
2413 The same applies to COMSPEC. */
2414 {
2415 char ** envp;
2416
2417 for (envp = environ; *envp; envp++)
2418 if (_strnicmp (*envp, "PATH=", 5) == 0)
2419 memcpy (*envp, "PATH=", 5);
2420 else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
2421 memcpy (*envp, "COMSPEC=", 8);
2422 }
2423
2424 /* Remember the initial working directory for getcwd. */
2425 /* FIXME: Do we need to resolve possible symlinks in startup_dir?
2426 Does it matter anywhere in Emacs? */
2427 if (w32_unicode_filenames)
2428 {
2429 wchar_t wstartup_dir[MAX_PATH];
2430
2431 if (!GetCurrentDirectoryW (MAX_PATH, wstartup_dir))
2432 emacs_abort ();
2433 filename_from_utf16 (wstartup_dir, startup_dir);
2434 }
2435 else
2436 {
2437 char astartup_dir[MAX_PATH];
2438
2439 if (!GetCurrentDirectoryA (MAX_PATH, astartup_dir))
2440 emacs_abort ();
2441 filename_from_ansi (astartup_dir, startup_dir);
2442 }
2443
2444 {
2445 static char modname[MAX_PATH];
2446
2447 if (!GetModuleFileName (NULL, modname, MAX_PATH))
2448 emacs_abort ();
2449 argv[0] = modname;
2450 }
2451
2452 /* Determine if there is a middle mouse button, to allow parse_button
2453 to decide whether right mouse events should be mouse-2 or
2454 mouse-3. */
2455 w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
2456
2457 init_user_info ();
2458 }
2459
2460 /* Called from expand-file-name when default-directory is not a string. */
2461
2462 char *
2463 emacs_root_dir (void)
2464 {
2465 static char root_dir[MAX_UTF8_PATH];
2466 const char *p;
2467
2468 p = getenv ("emacs_dir");
2469 if (p == NULL)
2470 emacs_abort ();
2471 filename_from_ansi (p, root_dir);
2472 root_dir[parse_root (root_dir, NULL)] = '\0';
2473 dostounix_filename (root_dir);
2474 return root_dir;
2475 }
2476
2477 #include <sys/timeb.h>
2478
2479 /* Emulate gettimeofday (Ulrich Leodolter, 1/11/95). */
2480 int
2481 gettimeofday (struct timeval *__restrict tv, struct timezone *__restrict tz)
2482 {
2483 struct _timeb tb;
2484 _ftime (&tb);
2485
2486 tv->tv_sec = tb.time;
2487 tv->tv_usec = tb.millitm * 1000L;
2488 /* Implementation note: _ftime sometimes doesn't update the dstflag
2489 according to the new timezone when the system timezone is
2490 changed. We could fix that by using GetSystemTime and
2491 GetTimeZoneInformation, but that doesn't seem necessary, since
2492 Emacs always calls gettimeofday with the 2nd argument NULL (see
2493 current_emacs_time). */
2494 if (tz)
2495 {
2496 tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich */
2497 tz->tz_dsttime = tb.dstflag; /* type of dst correction */
2498 }
2499 return 0;
2500 }
2501
2502 /* Emulate fdutimens. */
2503
2504 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
2505 TIMESPEC[0] and TIMESPEC[1], respectively.
2506 FD must be either negative -- in which case it is ignored --
2507 or a file descriptor that is open on FILE.
2508 If FD is nonnegative, then FILE can be NULL, which means
2509 use just futimes instead of utimes.
2510 If TIMESPEC is null, FAIL.
2511 Return 0 on success, -1 (setting errno) on failure. */
2512
2513 int
2514 fdutimens (int fd, char const *file, struct timespec const timespec[2])
2515 {
2516 if (!timespec)
2517 {
2518 errno = ENOSYS;
2519 return -1;
2520 }
2521 if (fd < 0 && !file)
2522 {
2523 errno = EBADF;
2524 return -1;
2525 }
2526 /* _futime's prototype defines 2nd arg as having the type 'struct
2527 _utimbuf', while utime needs to accept 'struct utimbuf' for
2528 compatibility with Posix. So we need to use 2 different (but
2529 equivalent) types to avoid compiler warnings, sigh. */
2530 if (fd >= 0)
2531 {
2532 struct _utimbuf _ut;
2533
2534 _ut.actime = timespec[0].tv_sec;
2535 _ut.modtime = timespec[1].tv_sec;
2536 return _futime (fd, &_ut);
2537 }
2538 else
2539 {
2540 struct utimbuf ut;
2541
2542 ut.actime = timespec[0].tv_sec;
2543 ut.modtime = timespec[1].tv_sec;
2544 /* Call 'utime', which is implemented below, not the MS library
2545 function, which fails on directories. */
2546 return utime (file, &ut);
2547 }
2548 }
2549
2550
2551 /* ------------------------------------------------------------------------- */
2552 /* IO support and wrapper functions for the Windows API. */
2553 /* ------------------------------------------------------------------------- */
2554
2555 /* Place a wrapper around the MSVC version of ctime. It returns NULL
2556 on network directories, so we handle that case here.
2557 (Ulrich Leodolter, 1/11/95). */
2558 char *
2559 sys_ctime (const time_t *t)
2560 {
2561 char *str = (char *) ctime (t);
2562 return (str ? str : "Sun Jan 01 00:00:00 1970");
2563 }
2564
2565 /* Emulate sleep...we could have done this with a define, but that
2566 would necessitate including windows.h in the files that used it.
2567 This is much easier. */
2568 void
2569 sys_sleep (int seconds)
2570 {
2571 Sleep (seconds * 1000);
2572 }
2573
2574 /* Internal MSVC functions for low-level descriptor munging */
2575 extern int __cdecl _set_osfhnd (int fd, long h);
2576 extern int __cdecl _free_osfhnd (int fd);
2577
2578 /* parallel array of private info on file handles */
2579 filedesc fd_info [ MAXDESC ];
2580
2581 typedef struct volume_info_data {
2582 struct volume_info_data * next;
2583
2584 /* time when info was obtained */
2585 DWORD timestamp;
2586
2587 /* actual volume info */
2588 char * root_dir;
2589 DWORD serialnum;
2590 DWORD maxcomp;
2591 DWORD flags;
2592 char * name;
2593 char * type;
2594 } volume_info_data;
2595
2596 /* Global referenced by various functions. */
2597 static volume_info_data volume_info;
2598
2599 /* Vector to indicate which drives are local and fixed (for which cached
2600 data never expires). */
2601 static BOOL fixed_drives[26];
2602
2603 /* Consider cached volume information to be stale if older than 10s,
2604 at least for non-local drives. Info for fixed drives is never stale. */
2605 #define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
2606 #define VOLINFO_STILL_VALID( root_dir, info ) \
2607 ( ( isalpha (root_dir[0]) && \
2608 fixed_drives[ DRIVE_INDEX (root_dir[0]) ] ) \
2609 || GetTickCount () - info->timestamp < 10000 )
2610
2611 /* Cache support functions. */
2612
2613 /* Simple linked list with linear search is sufficient. */
2614 static volume_info_data *volume_cache = NULL;
2615
2616 static volume_info_data *
2617 lookup_volume_info (char * root_dir)
2618 {
2619 volume_info_data * info;
2620
2621 for (info = volume_cache; info; info = info->next)
2622 if (xstrcasecmp (info->root_dir, root_dir) == 0)
2623 break;
2624 return info;
2625 }
2626
2627 static void
2628 add_volume_info (char * root_dir, volume_info_data * info)
2629 {
2630 info->root_dir = xstrdup (root_dir);
2631 unixtodos_filename (info->root_dir);
2632 info->next = volume_cache;
2633 volume_cache = info;
2634 }
2635
2636
2637 /* Wrapper for GetVolumeInformation, which uses caching to avoid
2638 performance penalty (~2ms on 486 for local drives, 7.5ms for local
2639 cdrom drive, ~5-10ms or more for remote drives on LAN). */
2640 static volume_info_data *
2641 GetCachedVolumeInformation (char * root_dir)
2642 {
2643 volume_info_data * info;
2644 char default_root[ MAX_UTF8_PATH ];
2645 char name[MAX_PATH+1];
2646 char type[MAX_PATH+1];
2647
2648 /* NULL for root_dir means use root from current directory. */
2649 if (root_dir == NULL)
2650 {
2651 if (w32_unicode_filenames)
2652 {
2653 wchar_t curdirw[MAX_PATH];
2654
2655 if (GetCurrentDirectoryW (MAX_PATH, curdirw) == 0)
2656 return NULL;
2657 filename_from_utf16 (curdirw, default_root);
2658 }
2659 else
2660 {
2661 char curdira[MAX_PATH];
2662
2663 if (GetCurrentDirectoryA (MAX_PATH, curdira) == 0)
2664 return NULL;
2665 filename_from_ansi (curdira, default_root);
2666 }
2667 parse_root (default_root, (const char **)&root_dir);
2668 *root_dir = 0;
2669 root_dir = default_root;
2670 }
2671
2672 /* Local fixed drives can be cached permanently. Removable drives
2673 cannot be cached permanently, since the volume name and serial
2674 number (if nothing else) can change. Remote drives should be
2675 treated as if they are removable, since there is no sure way to
2676 tell whether they are or not. Also, the UNC association of drive
2677 letters mapped to remote volumes can be changed at any time (even
2678 by other processes) without notice.
2679
2680 As a compromise, so we can benefit from caching info for remote
2681 volumes, we use a simple expiry mechanism to invalidate cache
2682 entries that are more than ten seconds old. */
2683
2684 #if 0
2685 /* No point doing this, because WNetGetConnection is even slower than
2686 GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
2687 GetDriveType is about the only call of this type which does not
2688 involve network access, and so is extremely quick). */
2689
2690 /* Map drive letter to UNC if remote. */
2691 if (isalpha (root_dir[0]) && !fixed[DRIVE_INDEX (root_dir[0])])
2692 {
2693 char remote_name[ 256 ];
2694 char drive[3] = { root_dir[0], ':' };
2695
2696 if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
2697 == NO_ERROR)
2698 /* do something */ ;
2699 }
2700 #endif
2701
2702 info = lookup_volume_info (root_dir);
2703
2704 if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
2705 {
2706 DWORD serialnum;
2707 DWORD maxcomp;
2708 DWORD flags;
2709
2710 /* Info is not cached, or is stale. */
2711 if (w32_unicode_filenames)
2712 {
2713 wchar_t root_w[MAX_PATH];
2714 wchar_t name_w[MAX_PATH+1];
2715 wchar_t type_w[MAX_PATH+1];
2716
2717 filename_to_utf16 (root_dir, root_w);
2718 if (!GetVolumeInformationW (root_w,
2719 name_w, sizeof (name_w),
2720 &serialnum,
2721 &maxcomp,
2722 &flags,
2723 type_w, sizeof (type_w)))
2724 return NULL;
2725 /* Hmm... not really 100% correct, as these 2 are not file
2726 names... */
2727 filename_from_utf16 (name_w, name);
2728 filename_from_utf16 (type_w, type);
2729 }
2730 else
2731 {
2732 char root_a[MAX_PATH];
2733 char name_a[MAX_PATH+1];
2734 char type_a[MAX_PATH+1];
2735
2736 filename_to_ansi (root_dir, root_a);
2737 if (!GetVolumeInformationA (root_a,
2738 name_a, sizeof (name_a),
2739 &serialnum,
2740 &maxcomp,
2741 &flags,
2742 type_a, sizeof (type_a)))
2743 return NULL;
2744 filename_from_ansi (name_a, name);
2745 filename_from_ansi (type_a, type);
2746 }
2747
2748 /* Cache the volume information for future use, overwriting existing
2749 entry if present. */
2750 if (info == NULL)
2751 {
2752 info = xmalloc (sizeof (volume_info_data));
2753 add_volume_info (root_dir, info);
2754 }
2755 else
2756 {
2757 xfree (info->name);
2758 xfree (info->type);
2759 }
2760
2761 info->name = xstrdup (name);
2762 unixtodos_filename (info->name);
2763 info->serialnum = serialnum;
2764 info->maxcomp = maxcomp;
2765 info->flags = flags;
2766 info->type = xstrdup (type);
2767 info->timestamp = GetTickCount ();
2768 }
2769
2770 return info;
2771 }
2772
2773 /* Get information on the volume where NAME is held; set path pointer to
2774 start of pathname in NAME (past UNC header\volume header if present),
2775 if pPath is non-NULL.
2776
2777 Note: if NAME includes symlinks, the information is for the volume
2778 of the symlink, not of its target. That's because, even though
2779 GetVolumeInformation returns information about the symlink target
2780 of its argument, we only pass the root directory to
2781 GetVolumeInformation, not the full NAME. */
2782 static int
2783 get_volume_info (const char * name, const char ** pPath)
2784 {
2785 char temp[MAX_UTF8_PATH];
2786 char *rootname = NULL; /* default to current volume */
2787 volume_info_data * info;
2788 int root_len = parse_root (name, pPath);
2789
2790 if (name == NULL)
2791 return FALSE;
2792
2793 /* Copy the root name of the volume, if given. */
2794 if (root_len)
2795 {
2796 strncpy (temp, name, root_len);
2797 temp[root_len] = '\0';
2798 unixtodos_filename (temp);
2799 rootname = temp;
2800 }
2801
2802 info = GetCachedVolumeInformation (rootname);
2803 if (info != NULL)
2804 {
2805 /* Set global referenced by other functions. */
2806 volume_info = *info;
2807 return TRUE;
2808 }
2809 return FALSE;
2810 }
2811
2812 /* Determine if volume is FAT format (ie. only supports short 8.3
2813 names); also set path pointer to start of pathname in name, if
2814 pPath is non-NULL. */
2815 static int
2816 is_fat_volume (const char * name, const char ** pPath)
2817 {
2818 if (get_volume_info (name, pPath))
2819 return (volume_info.maxcomp == 12);
2820 return FALSE;
2821 }
2822
2823 /* Convert all slashes in a filename to backslashes, and map filename
2824 to a valid 8.3 name if necessary. The result is a pointer to a
2825 static buffer, so CAVEAT EMPTOR! */
2826 const char *
2827 map_w32_filename (const char * name, const char ** pPath)
2828 {
2829 static char shortname[MAX_UTF8_PATH];
2830 char * str = shortname;
2831 char c;
2832 char * path;
2833 const char * save_name = name;
2834
2835 if (strlen (name) >= sizeof (shortname))
2836 {
2837 /* Return a filename which will cause callers to fail. */
2838 strcpy (shortname, "?");
2839 return shortname;
2840 }
2841
2842 if (is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
2843 {
2844 register int left = 8; /* maximum number of chars in part */
2845 register int extn = 0; /* extension added? */
2846 register int dots = 2; /* maximum number of dots allowed */
2847
2848 while (name < path)
2849 *str++ = *name++; /* skip past UNC header */
2850
2851 while ((c = *name++))
2852 {
2853 switch ( c )
2854 {
2855 case ':':
2856 case '\\':
2857 case '/':
2858 *str++ = (c == ':' ? ':' : '\\');
2859 extn = 0; /* reset extension flags */
2860 dots = 2; /* max 2 dots */
2861 left = 8; /* max length 8 for main part */
2862 break;
2863 case '.':
2864 if ( dots )
2865 {
2866 /* Convert path components of the form .xxx to _xxx,
2867 but leave . and .. as they are. This allows .emacs
2868 to be read as _emacs, for example. */
2869
2870 if (! *name ||
2871 *name == '.' ||
2872 IS_DIRECTORY_SEP (*name))
2873 {
2874 *str++ = '.';
2875 dots--;
2876 }
2877 else
2878 {
2879 *str++ = '_';
2880 left--;
2881 dots = 0;
2882 }
2883 }
2884 else if ( !extn )
2885 {
2886 *str++ = '.';
2887 extn = 1; /* we've got an extension */
2888 left = 3; /* 3 chars in extension */
2889 }
2890 else
2891 {
2892 /* any embedded dots after the first are converted to _ */
2893 *str++ = '_';
2894 }
2895 break;
2896 case '~':
2897 case '#': /* don't lose these, they're important */
2898 if ( ! left )
2899 str[-1] = c; /* replace last character of part */
2900 /* FALLTHRU */
2901 default:
2902 if ( left && 'A' <= c && c <= 'Z' )
2903 {
2904 *str++ = tolower (c); /* map to lower case (looks nicer) */
2905 left--;
2906 dots = 0; /* started a path component */
2907 }
2908 break;
2909 }
2910 }
2911 *str = '\0';
2912 }
2913 else
2914 {
2915 strcpy (shortname, name);
2916 unixtodos_filename (shortname);
2917 }
2918
2919 if (pPath)
2920 *pPath = shortname + (path - save_name);
2921
2922 return shortname;
2923 }
2924
2925 static int
2926 is_exec (const char * name)
2927 {
2928 char * p = strrchr (name, '.');
2929 return
2930 (p != NULL
2931 && (xstrcasecmp (p, ".exe") == 0 ||
2932 xstrcasecmp (p, ".com") == 0 ||
2933 xstrcasecmp (p, ".bat") == 0 ||
2934 xstrcasecmp (p, ".cmd") == 0));
2935 }
2936
2937 /* Emulate the Unix directory procedures opendir, closedir, and
2938 readdir. We rename them to sys_* names because some versions of
2939 MinGW startup code call opendir and readdir to glob wildcards, and
2940 the code that calls them doesn't grok UTF-8 encoded file names we
2941 produce in dirent->d_name[]. */
2942
2943 struct dirent dir_static; /* simulated directory contents */
2944 static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
2945 static int dir_is_fat;
2946 static char dir_pathname[MAX_UTF8_PATH];
2947 static WIN32_FIND_DATAW dir_find_data_w;
2948 static WIN32_FIND_DATAA dir_find_data_a;
2949
2950 /* Support shares on a network resource as subdirectories of a read-only
2951 root directory. */
2952 static HANDLE wnet_enum_handle = INVALID_HANDLE_VALUE;
2953 static HANDLE open_unc_volume (const char *);
2954 static void *read_unc_volume (HANDLE, wchar_t *, char *, int);
2955 static void close_unc_volume (HANDLE);
2956
2957 DIR *
2958 sys_opendir (const char *filename)
2959 {
2960 DIR *dirp;
2961
2962 /* Opening is done by FindFirstFile. However, a read is inherent to
2963 this operation, so we defer the open until read time. */
2964
2965 if (dir_find_handle != INVALID_HANDLE_VALUE)
2966 return NULL;
2967 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2968 return NULL;
2969
2970 /* Note: We don't support traversal of UNC volumes via symlinks.
2971 Doing so would mean punishing 99.99% of use cases by resolving
2972 all the possible symlinks in FILENAME, recursively. */
2973 if (is_unc_volume (filename))
2974 {
2975 wnet_enum_handle = open_unc_volume (filename);
2976 if (wnet_enum_handle == INVALID_HANDLE_VALUE)
2977 return NULL;
2978 }
2979
2980 if (!(dirp = (DIR *) malloc (sizeof (DIR))))
2981 return NULL;
2982
2983 dirp->dd_fd = 0;
2984 dirp->dd_loc = 0;
2985 dirp->dd_size = 0;
2986
2987 strncpy (dir_pathname, map_w32_filename (filename, NULL), MAX_UTF8_PATH - 1);
2988 dir_pathname[MAX_UTF8_PATH - 1] = '\0';
2989 /* Note: We don't support symlinks to file names on FAT volumes.
2990 Doing so would mean punishing 99.99% of use cases by resolving
2991 all the possible symlinks in FILENAME, recursively. */
2992 dir_is_fat = is_fat_volume (filename, NULL);
2993
2994 return dirp;
2995 }
2996
2997 void
2998 sys_closedir (DIR *dirp)
2999 {
3000 /* If we have a find-handle open, close it. */
3001 if (dir_find_handle != INVALID_HANDLE_VALUE)
3002 {
3003 FindClose (dir_find_handle);
3004 dir_find_handle = INVALID_HANDLE_VALUE;
3005 }
3006 else if (wnet_enum_handle != INVALID_HANDLE_VALUE)
3007 {
3008 close_unc_volume (wnet_enum_handle);
3009 wnet_enum_handle = INVALID_HANDLE_VALUE;
3010 }
3011 xfree ((char *) dirp);
3012 }
3013
3014 struct dirent *
3015 sys_readdir (DIR *dirp)
3016 {
3017 int downcase = !NILP (Vw32_downcase_file_names);
3018
3019 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
3020 {
3021 if (!read_unc_volume (wnet_enum_handle,
3022 dir_find_data_w.cFileName,
3023 dir_find_data_a.cFileName,
3024 MAX_PATH))
3025 return NULL;
3026 }
3027 /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
3028 else if (dir_find_handle == INVALID_HANDLE_VALUE)
3029 {
3030 char filename[MAX_UTF8_PATH + 2];
3031 int ln;
3032
3033 strcpy (filename, dir_pathname);
3034 ln = strlen (filename) - 1;
3035 if (!IS_DIRECTORY_SEP (filename[ln]))
3036 strcat (filename, "\\");
3037 strcat (filename, "*");
3038
3039 /* Note: No need to resolve symlinks in FILENAME, because
3040 FindFirst opens the directory that is the target of a
3041 symlink. */
3042 if (w32_unicode_filenames)
3043 {
3044 wchar_t fnw[MAX_PATH];
3045
3046 filename_to_utf16 (filename, fnw);
3047 dir_find_handle = FindFirstFileW (fnw, &dir_find_data_w);
3048 }
3049 else
3050 {
3051 char fna[MAX_PATH];
3052
3053 filename_to_ansi (filename, fna);
3054 dir_find_handle = FindFirstFileA (fna, &dir_find_data_a);
3055 }
3056
3057 if (dir_find_handle == INVALID_HANDLE_VALUE)
3058 return NULL;
3059 }
3060 else if (w32_unicode_filenames)
3061 {
3062 if (!FindNextFileW (dir_find_handle, &dir_find_data_w))
3063 return NULL;
3064 }
3065 else
3066 {
3067 if (!FindNextFileA (dir_find_handle, &dir_find_data_a))
3068 return NULL;
3069 }
3070
3071 /* Emacs never uses this value, so don't bother making it match
3072 value returned by stat(). */
3073 dir_static.d_ino = 1;
3074
3075 if (w32_unicode_filenames)
3076 {
3077 if (downcase || dir_is_fat)
3078 {
3079 wchar_t tem[MAX_PATH];
3080
3081 wcscpy (tem, dir_find_data_w.cFileName);
3082 CharLowerW (tem);
3083 filename_from_utf16 (tem, dir_static.d_name);
3084 }
3085 else
3086 filename_from_utf16 (dir_find_data_w.cFileName, dir_static.d_name);
3087 }
3088 else
3089 {
3090 char tem[MAX_PATH];
3091
3092 /* If the file name in cFileName[] includes `?' characters, it
3093 means the original file name used characters that cannot be
3094 represented by the current ANSI codepage. To avoid total
3095 lossage, retrieve the short 8+3 alias of the long file
3096 name. */
3097 if (_mbspbrk (dir_find_data_a.cFileName, "?"))
3098 {
3099 strcpy (tem, dir_find_data_a.cAlternateFileName);
3100 /* 8+3 aliases are returned in all caps, which could break
3101 various alists that look at filenames' extensions. */
3102 downcase = 1;
3103 }
3104 else if (downcase || dir_is_fat)
3105 strcpy (tem, dir_find_data_a.cFileName);
3106 else
3107 filename_from_ansi (dir_find_data_a.cFileName, dir_static.d_name);
3108 if (downcase || dir_is_fat)
3109 {
3110 _mbslwr (tem);
3111 filename_from_ansi (tem, dir_static.d_name);
3112 }
3113 }
3114
3115 dir_static.d_namlen = strlen (dir_static.d_name);
3116 dir_static.d_reclen = sizeof (struct dirent) - MAX_UTF8_PATH + 3 +
3117 dir_static.d_namlen - dir_static.d_namlen % 4;
3118
3119 return &dir_static;
3120 }
3121
3122 static HANDLE
3123 open_unc_volume (const char *path)
3124 {
3125 const char *fn = map_w32_filename (path, NULL);
3126 DWORD result;
3127 HANDLE henum;
3128
3129 if (w32_unicode_filenames)
3130 {
3131 NETRESOURCEW nrw;
3132 wchar_t fnw[MAX_PATH];
3133
3134 nrw.dwScope = RESOURCE_GLOBALNET;
3135 nrw.dwType = RESOURCETYPE_DISK;
3136 nrw.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER;
3137 nrw.dwUsage = RESOURCEUSAGE_CONTAINER;
3138 nrw.lpLocalName = NULL;
3139 filename_to_utf16 (fn, fnw);
3140 nrw.lpRemoteName = fnw;
3141 nrw.lpComment = NULL;
3142 nrw.lpProvider = NULL;
3143
3144 result = WNetOpenEnumW (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
3145 RESOURCEUSAGE_CONNECTABLE, &nrw, &henum);
3146 }
3147 else
3148 {
3149 NETRESOURCEA nra;
3150 char fna[MAX_PATH];
3151
3152 nra.dwScope = RESOURCE_GLOBALNET;
3153 nra.dwType = RESOURCETYPE_DISK;
3154 nra.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER;
3155 nra.dwUsage = RESOURCEUSAGE_CONTAINER;
3156 nra.lpLocalName = NULL;
3157 filename_to_ansi (fn, fna);
3158 nra.lpRemoteName = fna;
3159 nra.lpComment = NULL;
3160 nra.lpProvider = NULL;
3161
3162 result = WNetOpenEnumA (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
3163 RESOURCEUSAGE_CONNECTABLE, &nra, &henum);
3164 }
3165 if (result == NO_ERROR)
3166 return henum;
3167 else
3168 return INVALID_HANDLE_VALUE;
3169 }
3170
3171 static void *
3172 read_unc_volume (HANDLE henum, wchar_t *fname_w, char *fname_a, int size)
3173 {
3174 DWORD count;
3175 int result;
3176 char *buffer;
3177 DWORD bufsize = 512;
3178 void *retval;
3179
3180 count = 1;
3181 if (w32_unicode_filenames)
3182 {
3183 wchar_t *ptrw;
3184
3185 bufsize *= 2;
3186 buffer = alloca (bufsize);
3187 result = WNetEnumResourceW (henum, &count, buffer, &bufsize);
3188 if (result != NO_ERROR)
3189 return NULL;
3190 /* WNetEnumResource returns \\resource\share...skip forward to "share". */
3191 ptrw = ((LPNETRESOURCEW) buffer)->lpRemoteName;
3192 ptrw += 2;
3193 while (*ptrw && *ptrw != L'/' && *ptrw != L'\\') ptrw++;
3194 ptrw++;
3195 wcsncpy (fname_w, ptrw, size);
3196 retval = fname_w;
3197 }
3198 else
3199 {
3200 int dbcs_p = max_filename_mbslen () > 1;
3201 char *ptra;
3202
3203 buffer = alloca (bufsize);
3204 result = WNetEnumResourceA (henum, &count, buffer, &bufsize);
3205 if (result != NO_ERROR)
3206 return NULL;
3207 ptra = ((LPNETRESOURCEA) buffer)->lpRemoteName;
3208 ptra += 2;
3209 if (!dbcs_p)
3210 while (*ptra && !IS_DIRECTORY_SEP (*ptra)) ptra++;
3211 else
3212 {
3213 while (*ptra && !IS_DIRECTORY_SEP (*ptra))
3214 ptra = CharNextExA (file_name_codepage, ptra, 0);
3215 }
3216 ptra++;
3217 strncpy (fname_a, ptra, size);
3218 retval = fname_a;
3219 }
3220
3221 return retval;
3222 }
3223
3224 static void
3225 close_unc_volume (HANDLE henum)
3226 {
3227 if (henum != INVALID_HANDLE_VALUE)
3228 WNetCloseEnum (henum);
3229 }
3230
3231 static DWORD
3232 unc_volume_file_attributes (const char *path)
3233 {
3234 HANDLE henum;
3235 DWORD attrs;
3236
3237 henum = open_unc_volume (path);
3238 if (henum == INVALID_HANDLE_VALUE)
3239 return -1;
3240
3241 attrs = FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY;
3242
3243 close_unc_volume (henum);
3244
3245 return attrs;
3246 }
3247
3248 /* Ensure a network connection is authenticated. */
3249 static void
3250 logon_network_drive (const char *path)
3251 {
3252 char share[MAX_UTF8_PATH];
3253 int n_slashes;
3254 char drive[4];
3255 UINT drvtype;
3256 char *p;
3257 DWORD val;
3258
3259 if (IS_DIRECTORY_SEP (path[0]) && IS_DIRECTORY_SEP (path[1]))
3260 drvtype = DRIVE_REMOTE;
3261 else if (path[0] == '\0' || path[1] != ':')
3262 drvtype = GetDriveType (NULL);
3263 else
3264 {
3265 drive[0] = path[0];
3266 drive[1] = ':';
3267 drive[2] = '\\';
3268 drive[3] = '\0';
3269 drvtype = GetDriveType (drive);
3270 }
3271
3272 /* Only logon to networked drives. */
3273 if (drvtype != DRIVE_REMOTE)
3274 return;
3275
3276 n_slashes = 2;
3277 strncpy (share, path, MAX_UTF8_PATH);
3278 /* Truncate to just server and share name. */
3279 for (p = share + 2; *p && p < share + MAX_UTF8_PATH; p++)
3280 {
3281 if (IS_DIRECTORY_SEP (*p) && ++n_slashes > 3)
3282 {
3283 *p = '\0';
3284 break;
3285 }
3286 }
3287
3288 if (w32_unicode_filenames)
3289 {
3290 NETRESOURCEW resourcew;
3291 wchar_t share_w[MAX_PATH];
3292
3293 resourcew.dwScope = RESOURCE_GLOBALNET;
3294 resourcew.dwType = RESOURCETYPE_DISK;
3295 resourcew.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE;
3296 resourcew.dwUsage = RESOURCEUSAGE_CONTAINER;
3297 resourcew.lpLocalName = NULL;
3298 filename_to_utf16 (share, share_w);
3299 resourcew.lpRemoteName = share_w;
3300 resourcew.lpProvider = NULL;
3301
3302 val = WNetAddConnection2W (&resourcew, NULL, NULL, CONNECT_INTERACTIVE);
3303 }
3304 else
3305 {
3306 NETRESOURCEA resourcea;
3307 char share_a[MAX_PATH];
3308
3309 resourcea.dwScope = RESOURCE_GLOBALNET;
3310 resourcea.dwType = RESOURCETYPE_DISK;
3311 resourcea.dwDisplayType = RESOURCEDISPLAYTYPE_SHARE;
3312 resourcea.dwUsage = RESOURCEUSAGE_CONTAINER;
3313 resourcea.lpLocalName = NULL;
3314 filename_to_ansi (share, share_a);
3315 resourcea.lpRemoteName = share_a;
3316 resourcea.lpProvider = NULL;
3317
3318 val = WNetAddConnection2A (&resourcea, NULL, NULL, CONNECT_INTERACTIVE);
3319 }
3320
3321 switch (val)
3322 {
3323 case NO_ERROR:
3324 case ERROR_ALREADY_ASSIGNED:
3325 break;
3326 case ERROR_ACCESS_DENIED:
3327 case ERROR_LOGON_FAILURE:
3328 errno = EACCES;
3329 break;
3330 case ERROR_BUSY:
3331 errno = EAGAIN;
3332 break;
3333 case ERROR_BAD_NET_NAME:
3334 case ERROR_NO_NET_OR_BAD_PATH:
3335 case ERROR_NO_NETWORK:
3336 case ERROR_CANCELLED:
3337 default:
3338 errno = ENOENT;
3339 break;
3340 }
3341 }
3342
3343 /* Emulate faccessat(2). */
3344 int
3345 faccessat (int dirfd, const char * path, int mode, int flags)
3346 {
3347 DWORD attributes;
3348
3349 if (dirfd != AT_FDCWD
3350 && !(IS_DIRECTORY_SEP (path[0])
3351 || IS_DEVICE_SEP (path[1])))
3352 {
3353 errno = EBADF;
3354 return -1;
3355 }
3356
3357 /* MSVCRT implementation of 'access' doesn't recognize D_OK, and its
3358 newer versions blow up when passed D_OK. */
3359 path = map_w32_filename (path, NULL);
3360 /* If the last element of PATH is a symlink, we need to resolve it
3361 to get the attributes of its target file. Note: any symlinks in
3362 PATH elements other than the last one are transparently resolved
3363 by GetFileAttributes below. */
3364 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0
3365 && (flags & AT_SYMLINK_NOFOLLOW) == 0)
3366 path = chase_symlinks (path);
3367
3368 if (w32_unicode_filenames)
3369 {
3370 wchar_t path_w[MAX_PATH];
3371
3372 filename_to_utf16 (path, path_w);
3373 attributes = GetFileAttributesW (path_w);
3374 }
3375 else
3376 {
3377 char path_a[MAX_PATH];
3378
3379 filename_to_ansi (path, path_a);
3380 attributes = GetFileAttributesA (path_a);
3381 }
3382
3383 if (attributes == -1)
3384 {
3385 DWORD w32err = GetLastError ();
3386
3387 switch (w32err)
3388 {
3389 case ERROR_INVALID_NAME:
3390 case ERROR_BAD_PATHNAME:
3391 if (is_unc_volume (path))
3392 {
3393 attributes = unc_volume_file_attributes (path);
3394 if (attributes == -1)
3395 {
3396 errno = EACCES;
3397 return -1;
3398 }
3399 break;
3400 }
3401 /* FALLTHROUGH */
3402 case ERROR_FILE_NOT_FOUND:
3403 case ERROR_BAD_NETPATH:
3404 errno = ENOENT;
3405 break;
3406 default:
3407 errno = EACCES;
3408 break;
3409 }
3410 return -1;
3411 }
3412 if ((mode & X_OK) != 0
3413 && !(is_exec (path) || (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0))
3414 {
3415 errno = EACCES;
3416 return -1;
3417 }
3418 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
3419 {
3420 errno = EACCES;
3421 return -1;
3422 }
3423 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
3424 {
3425 errno = EACCES;
3426 return -1;
3427 }
3428 return 0;
3429 }
3430
3431 /* A version of 'access' to be used locally with file names in
3432 locale-specific encoding. Does not resolve symlinks and does not
3433 support file names on FAT12 and FAT16 volumes, but that's OK, since
3434 we only invoke this function for files inside the Emacs source or
3435 installation tree, on directories (so any symlinks should have the
3436 directory bit set), and on short file names such as "C:/.emacs". */
3437 static int
3438 sys_access (const char *fname, int mode)
3439 {
3440 char fname_copy[MAX_PATH], *p;
3441 DWORD attributes;
3442
3443 strcpy (fname_copy, fname);
3444 /* Do the equivalent of unixtodos_filename. */
3445 for (p = fname_copy; *p; p = CharNext (p))
3446 if (*p == '/')
3447 *p = '\\';
3448
3449 if ((attributes = GetFileAttributesA (fname_copy)) == -1)
3450 {
3451 DWORD w32err = GetLastError ();
3452
3453 switch (w32err)
3454 {
3455 case ERROR_INVALID_NAME:
3456 case ERROR_BAD_PATHNAME:
3457 case ERROR_FILE_NOT_FOUND:
3458 case ERROR_BAD_NETPATH:
3459 errno = ENOENT;
3460 break;
3461 default:
3462 errno = EACCES;
3463 break;
3464 }
3465 return -1;
3466 }
3467 if ((mode & X_OK) != 0
3468 && !(is_exec (fname_copy)
3469 || (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0))
3470 {
3471 errno = EACCES;
3472 return -1;
3473 }
3474 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
3475 {
3476 errno = EACCES;
3477 return -1;
3478 }
3479 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
3480 {
3481 errno = EACCES;
3482 return -1;
3483 }
3484 return 0;
3485 }
3486
3487 /* Shadow some MSVC runtime functions to map requests for long filenames
3488 to reasonable short names if necessary. This was originally added to
3489 permit running Emacs on NT 3.1 on a FAT partition, which doesn't support
3490 long file names. */
3491
3492 int
3493 sys_chdir (const char * path)
3494 {
3495 path = map_w32_filename (path, NULL);
3496 if (w32_unicode_filenames)
3497 {
3498 wchar_t newdir_w[MAX_PATH];
3499
3500 if (filename_to_utf16 (path, newdir_w) == 0)
3501 return _wchdir (newdir_w);
3502 return -1;
3503 }
3504 else
3505 {
3506 char newdir_a[MAX_PATH];
3507
3508 if (filename_to_ansi (path, newdir_a) == 0)
3509 return _chdir (newdir_a);
3510 return -1;
3511 }
3512 }
3513
3514 int
3515 sys_chmod (const char * path, int mode)
3516 {
3517 path = chase_symlinks (map_w32_filename (path, NULL));
3518 if (w32_unicode_filenames)
3519 {
3520 wchar_t path_w[MAX_PATH];
3521
3522 filename_to_utf16 (path, path_w);
3523 return _wchmod (path_w, mode);
3524 }
3525 else
3526 {
3527 char path_a[MAX_PATH];
3528
3529 filename_to_ansi (path, path_a);
3530 return _chmod (path_a, mode);
3531 }
3532 }
3533
3534 int
3535 sys_creat (const char * path, int mode)
3536 {
3537 path = map_w32_filename (path, NULL);
3538 if (w32_unicode_filenames)
3539 {
3540 wchar_t path_w[MAX_PATH];
3541
3542 filename_to_utf16 (path, path_w);
3543 return _wcreat (path_w, mode);
3544 }
3545 else
3546 {
3547 char path_a[MAX_PATH];
3548
3549 filename_to_ansi (path, path_a);
3550 return _creat (path_a, mode);
3551 }
3552 }
3553
3554 FILE *
3555 sys_fopen (const char * path, const char * mode)
3556 {
3557 int fd;
3558 int oflag;
3559 const char * mode_save = mode;
3560
3561 /* Force all file handles to be non-inheritable. This is necessary to
3562 ensure child processes don't unwittingly inherit handles that might
3563 prevent future file access. */
3564
3565 if (mode[0] == 'r')
3566 oflag = O_RDONLY;
3567 else if (mode[0] == 'w' || mode[0] == 'a')
3568 oflag = O_WRONLY | O_CREAT | O_TRUNC;
3569 else
3570 return NULL;
3571
3572 /* Only do simplistic option parsing. */
3573 while (*++mode)
3574 if (mode[0] == '+')
3575 {
3576 oflag &= ~(O_RDONLY | O_WRONLY);
3577 oflag |= O_RDWR;
3578 }
3579 else if (mode[0] == 'b')
3580 {
3581 oflag &= ~O_TEXT;
3582 oflag |= O_BINARY;
3583 }
3584 else if (mode[0] == 't')
3585 {
3586 oflag &= ~O_BINARY;
3587 oflag |= O_TEXT;
3588 }
3589 else break;
3590
3591 path = map_w32_filename (path, NULL);
3592 if (w32_unicode_filenames)
3593 {
3594 wchar_t path_w[MAX_PATH];
3595
3596 filename_to_utf16 (path, path_w);
3597 fd = _wopen (path_w, oflag | _O_NOINHERIT, 0644);
3598 }
3599 else
3600 {
3601 char path_a[MAX_PATH];
3602
3603 filename_to_ansi (path, path_a);
3604 fd = _open (path_a, oflag | _O_NOINHERIT, 0644);
3605 }
3606 if (fd < 0)
3607 return NULL;
3608
3609 return _fdopen (fd, mode_save);
3610 }
3611
3612 /* This only works on NTFS volumes, but is useful to have. */
3613 int
3614 sys_link (const char * old, const char * new)
3615 {
3616 HANDLE fileh;
3617 int result = -1;
3618 char oldname[MAX_UTF8_PATH], newname[MAX_UTF8_PATH];
3619 wchar_t oldname_w[MAX_PATH];
3620 char oldname_a[MAX_PATH];
3621
3622 if (old == NULL || new == NULL)
3623 {
3624 errno = ENOENT;
3625 return -1;
3626 }
3627
3628 strcpy (oldname, map_w32_filename (old, NULL));
3629 strcpy (newname, map_w32_filename (new, NULL));
3630
3631 if (w32_unicode_filenames)
3632 {
3633 filename_to_utf16 (oldname, oldname_w);
3634 fileh = CreateFileW (oldname_w, 0, 0, NULL, OPEN_EXISTING,
3635 FILE_FLAG_BACKUP_SEMANTICS, NULL);
3636 }
3637 else
3638 {
3639 filename_to_ansi (oldname, oldname_a);
3640 fileh = CreateFileA (oldname_a, 0, 0, NULL, OPEN_EXISTING,
3641 FILE_FLAG_BACKUP_SEMANTICS, NULL);
3642 }
3643 if (fileh != INVALID_HANDLE_VALUE)
3644 {
3645 int wlen;
3646
3647 /* Confusingly, the "alternate" stream name field does not apply
3648 when restoring a hard link, and instead contains the actual
3649 stream data for the link (ie. the name of the link to create).
3650 The WIN32_STREAM_ID structure before the cStreamName field is
3651 the stream header, which is then immediately followed by the
3652 stream data. */
3653
3654 struct {
3655 WIN32_STREAM_ID wid;
3656 WCHAR wbuffer[MAX_PATH]; /* extra space for link name */
3657 } data;
3658
3659 /* We used to pass MB_PRECOMPOSED as the 2nd arg here, but MSDN
3660 indicates that flag is unsupported for CP_UTF8, and OTOH says
3661 it is the default anyway. */
3662 wlen = MultiByteToWideChar (CP_UTF8, 0, newname, -1,
3663 data.wid.cStreamName, MAX_PATH);
3664 if (wlen > 0)
3665 {
3666 LPVOID context = NULL;
3667 DWORD wbytes = 0;
3668
3669 data.wid.dwStreamId = BACKUP_LINK;
3670 data.wid.dwStreamAttributes = 0;
3671 data.wid.Size.LowPart = wlen * sizeof (WCHAR);
3672 data.wid.Size.HighPart = 0;
3673 data.wid.dwStreamNameSize = 0;
3674
3675 if (BackupWrite (fileh, (LPBYTE)&data,
3676 offsetof (WIN32_STREAM_ID, cStreamName)
3677 + data.wid.Size.LowPart,
3678 &wbytes, FALSE, FALSE, &context)
3679 && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
3680 {
3681 /* succeeded */
3682 result = 0;
3683 }
3684 else
3685 {
3686 DWORD err = GetLastError ();
3687 DWORD attributes;
3688
3689 switch (err)
3690 {
3691 case ERROR_ACCESS_DENIED:
3692 /* This is what happens when OLDNAME is a directory,
3693 since Windows doesn't support hard links to
3694 directories. Posix says to set errno to EPERM in
3695 that case. */
3696 if (w32_unicode_filenames)
3697 attributes = GetFileAttributesW (oldname_w);
3698 else
3699 attributes = GetFileAttributesA (oldname_a);
3700 if (attributes != -1
3701 && (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
3702 errno = EPERM;
3703 else if (attributes == -1
3704 && is_unc_volume (oldname)
3705 && unc_volume_file_attributes (oldname) != -1)
3706 errno = EPERM;
3707 else
3708 errno = EACCES;
3709 break;
3710 case ERROR_TOO_MANY_LINKS:
3711 errno = EMLINK;
3712 break;
3713 case ERROR_NOT_SAME_DEVICE:
3714 errno = EXDEV;
3715 break;
3716 default:
3717 errno = EINVAL;
3718 break;
3719 }
3720 }
3721 }
3722
3723 CloseHandle (fileh);
3724 }
3725 else
3726 errno = ENOENT;
3727
3728 return result;
3729 }
3730
3731 int
3732 sys_mkdir (const char * path)
3733 {
3734 path = map_w32_filename (path, NULL);
3735
3736 if (w32_unicode_filenames)
3737 {
3738 wchar_t path_w[MAX_PATH];
3739
3740 filename_to_utf16 (path, path_w);
3741 return _wmkdir (path_w);
3742 }
3743 else
3744 {
3745 char path_a[MAX_PATH];
3746
3747 filename_to_ansi (path, path_a);
3748 return _mkdir (path_a);
3749 }
3750 }
3751
3752 int
3753 sys_open (const char * path, int oflag, int mode)
3754 {
3755 const char* mpath = map_w32_filename (path, NULL);
3756 int res = -1;
3757
3758 if (w32_unicode_filenames)
3759 {
3760 wchar_t mpath_w[MAX_PATH];
3761
3762 filename_to_utf16 (mpath, mpath_w);
3763 /* If possible, try to open file without _O_CREAT, to be able to
3764 write to existing hidden and system files. Force all file
3765 handles to be non-inheritable. */
3766 if ((oflag & (_O_CREAT | _O_EXCL)) != (_O_CREAT | _O_EXCL))
3767 res = _wopen (mpath_w, (oflag & ~_O_CREAT) | _O_NOINHERIT, mode);
3768 if (res < 0)
3769 res = _wopen (mpath_w, oflag | _O_NOINHERIT, mode);
3770 }
3771 else
3772 {
3773 char mpath_a[MAX_PATH];
3774
3775 filename_to_ansi (mpath, mpath_a);
3776 if ((oflag & (_O_CREAT | _O_EXCL)) != (_O_CREAT | _O_EXCL))
3777 res = _open (mpath_a, (oflag & ~_O_CREAT) | _O_NOINHERIT, mode);
3778 if (res < 0)
3779 res = _open (mpath_a, oflag | _O_NOINHERIT, mode);
3780 }
3781
3782 return res;
3783 }
3784
3785 /* Implementation of mkostemp for MS-Windows, to avoid race conditions
3786 when using mktemp.
3787
3788 Standard algorithm for generating a temporary file name seems to be
3789 use pid or tid with a letter on the front (in place of the 6 X's)
3790 and cycle through the letters to find a unique name. We extend
3791 that to allow any reasonable character as the first of the 6 X's,
3792 so that the number of simultaneously used temporary files will be
3793 greater. */
3794
3795 int
3796 mkostemp (char * template, int flags)
3797 {
3798 char * p;
3799 int i, fd = -1;
3800 unsigned uid = GetCurrentThreadId ();
3801 int save_errno = errno;
3802 static char first_char[] = "abcdefghijklmnopqrstuvwyz0123456789!%-_@#";
3803
3804 errno = EINVAL;
3805 if (template == NULL)
3806 return -1;
3807
3808 p = template + strlen (template);
3809 i = 5;
3810 /* replace up to the last 5 X's with uid in decimal */
3811 while (--p >= template && p[0] == 'X' && --i >= 0)
3812 {
3813 p[0] = '0' + uid % 10;
3814 uid /= 10;
3815 }
3816
3817 if (i < 0 && p[0] == 'X')
3818 {
3819 i = 0;
3820 do
3821 {
3822 p[0] = first_char[i];
3823 if ((fd = sys_open (template,
3824 flags | _O_CREAT | _O_EXCL | _O_RDWR,
3825 S_IRUSR | S_IWUSR)) >= 0
3826 || errno != EEXIST)
3827 {
3828 if (fd >= 0)
3829 errno = save_errno;
3830 return fd;
3831 }
3832 }
3833 while (++i < sizeof (first_char));
3834 }
3835
3836 /* Template is badly formed or else we can't generate a unique name. */
3837 return -1;
3838 }
3839
3840 int
3841 fchmod (int fd, mode_t mode)
3842 {
3843 return 0;
3844 }
3845
3846 int
3847 sys_rename_replace (const char *oldname, const char *newname, BOOL force)
3848 {
3849 BOOL result;
3850 char temp[MAX_PATH];
3851 int newname_dev;
3852 int oldname_dev;
3853
3854 /* MoveFile on Windows 95 doesn't correctly change the short file name
3855 alias in a number of circumstances (it is not easy to predict when
3856 just by looking at oldname and newname, unfortunately). In these
3857 cases, renaming through a temporary name avoids the problem.
3858
3859 A second problem on Windows 95 is that renaming through a temp name when
3860 newname is uppercase fails (the final long name ends up in
3861 lowercase, although the short alias might be uppercase) UNLESS the
3862 long temp name is not 8.3.
3863
3864 So, on Windows 95 we always rename through a temp name, and we make sure
3865 the temp name has a long extension to ensure correct renaming. */
3866
3867 strcpy (temp, map_w32_filename (oldname, NULL));
3868
3869 /* volume_info is set indirectly by map_w32_filename. */
3870 oldname_dev = volume_info.serialnum;
3871
3872 if (os_subtype == OS_9X)
3873 {
3874 char * o;
3875 char * p;
3876 int i = 0;
3877
3878 oldname = map_w32_filename (oldname, NULL);
3879 if ((o = strrchr (oldname, '\\')))
3880 o++;
3881 else
3882 o = (char *) oldname;
3883
3884 if ((p = strrchr (temp, '\\')))
3885 p++;
3886 else
3887 p = temp;
3888
3889 do
3890 {
3891 /* Force temp name to require a manufactured 8.3 alias - this
3892 seems to make the second rename work properly. */
3893 sprintf (p, "_.%s.%u", o, i);
3894 i++;
3895 result = rename (oldname, temp);
3896 }
3897 /* This loop must surely terminate! */
3898 while (result < 0 && errno == EEXIST);
3899 if (result < 0)
3900 return -1;
3901 }
3902
3903 /* If FORCE, emulate Unix behavior - newname is deleted if it already exists
3904 (at least if it is a file; don't do this for directories).
3905
3906 Since we mustn't do this if we are just changing the case of the
3907 file name (we would end up deleting the file we are trying to
3908 rename!), we let rename detect if the destination file already
3909 exists - that way we avoid the possible pitfalls of trying to
3910 determine ourselves whether two names really refer to the same
3911 file, which is not always possible in the general case. (Consider
3912 all the permutations of shared or subst'd drives, etc.) */
3913
3914 newname = map_w32_filename (newname, NULL);
3915
3916 /* volume_info is set indirectly by map_w32_filename. */
3917 newname_dev = volume_info.serialnum;
3918
3919 result = rename (temp, newname);
3920
3921 if (result < 0 && force)
3922 {
3923 DWORD w32err = GetLastError ();
3924
3925 if (errno == EACCES
3926 && newname_dev != oldname_dev)
3927 {
3928 /* The implementation of `rename' on Windows does not return
3929 errno = EXDEV when you are moving a directory to a
3930 different storage device (ex. logical disk). It returns
3931 EACCES instead. So here we handle such situations and
3932 return EXDEV. */
3933 DWORD attributes;
3934
3935 if ((attributes = GetFileAttributes (temp)) != -1
3936 && (attributes & FILE_ATTRIBUTE_DIRECTORY))
3937 errno = EXDEV;
3938 }
3939 else if (errno == EEXIST)
3940 {
3941 if (_chmod (newname, 0666) != 0)
3942 return result;
3943 if (_unlink (newname) != 0)
3944 return result;
3945 result = rename (temp, newname);
3946 }
3947 else if (w32err == ERROR_PRIVILEGE_NOT_HELD
3948 && is_symlink (temp))
3949 {
3950 /* This is Windows prohibiting the user from creating a
3951 symlink in another place, since that requires
3952 privileges. */
3953 errno = EPERM;
3954 }
3955 }
3956
3957 return result;
3958 }
3959
3960 int
3961 sys_rename (char const *old, char const *new)
3962 {
3963 return sys_rename_replace (old, new, TRUE);
3964 }
3965
3966 int
3967 sys_rmdir (const char * path)
3968 {
3969 return _rmdir (map_w32_filename (path, NULL));
3970 }
3971
3972 int
3973 sys_unlink (const char * path)
3974 {
3975 path = map_w32_filename (path, NULL);
3976
3977 /* On Unix, unlink works without write permission. */
3978 _chmod (path, 0666);
3979 return _unlink (path);
3980 }
3981
3982 static FILETIME utc_base_ft;
3983 static ULONGLONG utc_base; /* In 100ns units */
3984 static int init = 0;
3985
3986 #define FILETIME_TO_U64(result, ft) \
3987 do { \
3988 ULARGE_INTEGER uiTemp; \
3989 uiTemp.LowPart = (ft).dwLowDateTime; \
3990 uiTemp.HighPart = (ft).dwHighDateTime; \
3991 result = uiTemp.QuadPart; \
3992 } while (0)
3993
3994 static void
3995 initialize_utc_base (void)
3996 {
3997 /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
3998 SYSTEMTIME st;
3999
4000 st.wYear = 1970;
4001 st.wMonth = 1;
4002 st.wDay = 1;
4003 st.wHour = 0;
4004 st.wMinute = 0;
4005 st.wSecond = 0;
4006 st.wMilliseconds = 0;
4007
4008 SystemTimeToFileTime (&st, &utc_base_ft);
4009 FILETIME_TO_U64 (utc_base, utc_base_ft);
4010 }
4011
4012 static time_t
4013 convert_time (FILETIME ft)
4014 {
4015 ULONGLONG tmp;
4016
4017 if (!init)
4018 {
4019 initialize_utc_base ();
4020 init = 1;
4021 }
4022
4023 if (CompareFileTime (&ft, &utc_base_ft) < 0)
4024 return 0;
4025
4026 FILETIME_TO_U64 (tmp, ft);
4027 return (time_t) ((tmp - utc_base) / 10000000L);
4028 }
4029
4030 static void
4031 convert_from_time_t (time_t time, FILETIME * pft)
4032 {
4033 ULARGE_INTEGER tmp;
4034
4035 if (!init)
4036 {
4037 initialize_utc_base ();
4038 init = 1;
4039 }
4040
4041 /* time in 100ns units since 1-Jan-1601 */
4042 tmp.QuadPart = (ULONGLONG) time * 10000000L + utc_base;
4043 pft->dwHighDateTime = tmp.HighPart;
4044 pft->dwLowDateTime = tmp.LowPart;
4045 }
4046
4047 static PSECURITY_DESCRIPTOR
4048 get_file_security_desc_by_handle (HANDLE h)
4049 {
4050 PSECURITY_DESCRIPTOR psd = NULL;
4051 DWORD err;
4052 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
4053 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
4054
4055 err = get_security_info (h, SE_FILE_OBJECT, si,
4056 NULL, NULL, NULL, NULL, &psd);
4057 if (err != ERROR_SUCCESS)
4058 return NULL;
4059
4060 return psd;
4061 }
4062
4063 static PSECURITY_DESCRIPTOR
4064 get_file_security_desc_by_name (const char *fname)
4065 {
4066 PSECURITY_DESCRIPTOR psd = NULL;
4067 DWORD sd_len, err;
4068 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
4069 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
4070
4071 if (!get_file_security (fname, si, psd, 0, &sd_len))
4072 {
4073 err = GetLastError ();
4074 if (err != ERROR_INSUFFICIENT_BUFFER)
4075 return NULL;
4076 }
4077
4078 psd = xmalloc (sd_len);
4079 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
4080 {
4081 xfree (psd);
4082 return NULL;
4083 }
4084
4085 return psd;
4086 }
4087
4088 static DWORD
4089 get_rid (PSID sid)
4090 {
4091 unsigned n_subauthorities;
4092
4093 /* Use the last sub-authority value of the RID, the relative
4094 portion of the SID, as user/group ID. */
4095 n_subauthorities = *get_sid_sub_authority_count (sid);
4096 if (n_subauthorities < 1)
4097 return 0; /* the "World" RID */
4098 return *get_sid_sub_authority (sid, n_subauthorities - 1);
4099 }
4100
4101 /* Caching SID and account values for faster lokup. */
4102
4103 struct w32_id {
4104 unsigned rid;
4105 struct w32_id *next;
4106 char name[GNLEN+1];
4107 unsigned char sid[FLEXIBLE_ARRAY_MEMBER];
4108 };
4109
4110 static struct w32_id *w32_idlist;
4111
4112 static int
4113 w32_cached_id (PSID sid, unsigned *id, char *name)
4114 {
4115 struct w32_id *tail, *found;
4116
4117 for (found = NULL, tail = w32_idlist; tail; tail = tail->next)
4118 {
4119 if (equal_sid ((PSID)tail->sid, sid))
4120 {
4121 found = tail;
4122 break;
4123 }
4124 }
4125 if (found)
4126 {
4127 *id = found->rid;
4128 strcpy (name, found->name);
4129 return 1;
4130 }
4131 else
4132 return 0;
4133 }
4134
4135 static void
4136 w32_add_to_cache (PSID sid, unsigned id, char *name)
4137 {
4138 DWORD sid_len;
4139 struct w32_id *new_entry;
4140
4141 /* We don't want to leave behind stale cache from when Emacs was
4142 dumped. */
4143 if (initialized)
4144 {
4145 sid_len = get_length_sid (sid);
4146 new_entry = xmalloc (offsetof (struct w32_id, sid) + sid_len);
4147 if (new_entry)
4148 {
4149 new_entry->rid = id;
4150 strcpy (new_entry->name, name);
4151 copy_sid (sid_len, (PSID)new_entry->sid, sid);
4152 new_entry->next = w32_idlist;
4153 w32_idlist = new_entry;
4154 }
4155 }
4156 }
4157
4158 #define UID 1
4159 #define GID 2
4160
4161 static int
4162 get_name_and_id (PSECURITY_DESCRIPTOR psd, unsigned *id, char *nm, int what)
4163 {
4164 PSID sid = NULL;
4165 BOOL dflt;
4166 SID_NAME_USE ignore;
4167 char name[UNLEN+1];
4168 DWORD name_len = sizeof (name);
4169 char domain[1024];
4170 DWORD domain_len = sizeof (domain);
4171 int use_dflt = 0;
4172 int result;
4173
4174 if (what == UID)
4175 result = get_security_descriptor_owner (psd, &sid, &dflt);
4176 else if (what == GID)
4177 result = get_security_descriptor_group (psd, &sid, &dflt);
4178 else
4179 result = 0;
4180
4181 if (!result || !is_valid_sid (sid))
4182 use_dflt = 1;
4183 else if (!w32_cached_id (sid, id, nm))
4184 {
4185 if (!lookup_account_sid (NULL, sid, name, &name_len,
4186 domain, &domain_len, &ignore)
4187 || name_len > UNLEN+1)
4188 use_dflt = 1;
4189 else
4190 {
4191 *id = get_rid (sid);
4192 strcpy (nm, name);
4193 w32_add_to_cache (sid, *id, name);
4194 }
4195 }
4196 return use_dflt;
4197 }
4198
4199 static void
4200 get_file_owner_and_group (PSECURITY_DESCRIPTOR psd, struct stat *st)
4201 {
4202 int dflt_usr = 0, dflt_grp = 0;
4203
4204 if (!psd)
4205 {
4206 dflt_usr = 1;
4207 dflt_grp = 1;
4208 }
4209 else
4210 {
4211 if (get_name_and_id (psd, &st->st_uid, st->st_uname, UID))
4212 dflt_usr = 1;
4213 if (get_name_and_id (psd, &st->st_gid, st->st_gname, GID))
4214 dflt_grp = 1;
4215 }
4216 /* Consider files to belong to current user/group, if we cannot get
4217 more accurate information. */
4218 if (dflt_usr)
4219 {
4220 st->st_uid = dflt_passwd.pw_uid;
4221 strcpy (st->st_uname, dflt_passwd.pw_name);
4222 }
4223 if (dflt_grp)
4224 {
4225 st->st_gid = dflt_passwd.pw_gid;
4226 strcpy (st->st_gname, dflt_group.gr_name);
4227 }
4228 }
4229
4230 /* Return non-zero if NAME is a potentially slow filesystem. */
4231 int
4232 is_slow_fs (const char *name)
4233 {
4234 char drive_root[4];
4235 UINT devtype;
4236
4237 if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
4238 devtype = DRIVE_REMOTE; /* assume UNC name is remote */
4239 else if (!(strlen (name) >= 2 && IS_DEVICE_SEP (name[1])))
4240 devtype = GetDriveType (NULL); /* use root of current drive */
4241 else
4242 {
4243 /* GetDriveType needs the root directory of the drive. */
4244 strncpy (drive_root, name, 2);
4245 drive_root[2] = '\\';
4246 drive_root[3] = '\0';
4247 devtype = GetDriveType (drive_root);
4248 }
4249 return !(devtype == DRIVE_FIXED || devtype == DRIVE_RAMDISK);
4250 }
4251
4252 /* If this is non-zero, the caller wants accurate information about
4253 file's owner and group, which could be expensive to get. */
4254 int w32_stat_get_owner_group;
4255
4256 /* MSVC stat function can't cope with UNC names and has other bugs, so
4257 replace it with our own. This also allows us to calculate consistent
4258 inode values and owner/group without hacks in the main Emacs code. */
4259
4260 static int
4261 stat_worker (const char * path, struct stat * buf, int follow_symlinks)
4262 {
4263 char *name, *save_name, *r;
4264 WIN32_FIND_DATA wfd;
4265 HANDLE fh;
4266 unsigned __int64 fake_inode = 0;
4267 int permission;
4268 int len;
4269 int rootdir = FALSE;
4270 PSECURITY_DESCRIPTOR psd = NULL;
4271 int is_a_symlink = 0;
4272 DWORD file_flags = FILE_FLAG_BACKUP_SEMANTICS;
4273 DWORD access_rights = 0;
4274 DWORD fattrs = 0, serialnum = 0, fs_high = 0, fs_low = 0, nlinks = 1;
4275 FILETIME ctime, atime, wtime;
4276 int dbcs_p;
4277
4278 if (path == NULL || buf == NULL)
4279 {
4280 errno = EFAULT;
4281 return -1;
4282 }
4283
4284 save_name = name = (char *) map_w32_filename (path, &path);
4285 /* Must be valid filename, no wild cards or other invalid
4286 characters. We use _mbspbrk to support multibyte strings that
4287 might look to strpbrk as if they included literal *, ?, and other
4288 characters mentioned below that are disallowed by Windows
4289 filesystems. */
4290 if (_mbspbrk (name, "*?|<>\""))
4291 {
4292 errno = ENOENT;
4293 return -1;
4294 }
4295
4296 /* Remove trailing directory separator, unless name is the root
4297 directory of a drive or UNC volume in which case ensure there
4298 is a trailing separator. */
4299 len = strlen (name);
4300 name = strcpy (alloca (len + 2), name);
4301
4302 /* Avoid a somewhat costly call to is_symlink if the filesystem
4303 doesn't support symlinks. */
4304 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
4305 is_a_symlink = is_symlink (name);
4306
4307 /* Plan A: Open the file and get all the necessary information via
4308 the resulting handle. This solves several issues in one blow:
4309
4310 . retrieves attributes for the target of a symlink, if needed
4311 . gets attributes of root directories and symlinks pointing to
4312 root directories, thus avoiding the need for special-casing
4313 these and detecting them by examining the file-name format
4314 . retrieves more accurate attributes (e.g., non-zero size for
4315 some directories, esp. directories that are junction points)
4316 . correctly resolves "c:/..", "/.." and similar file names
4317 . avoids run-time penalties for 99% of use cases
4318
4319 Plan A is always tried first, unless the user asked not to (but
4320 if the file is a symlink and we need to follow links, we try Plan
4321 A even if the user asked not to).
4322
4323 If Plan A fails, we go to Plan B (below), where various
4324 potentially expensive techniques must be used to handle "special"
4325 files such as UNC volumes etc. */
4326 if (!(NILP (Vw32_get_true_file_attributes)
4327 || (EQ (Vw32_get_true_file_attributes, Qlocal) && is_slow_fs (name)))
4328 /* Following symlinks requires getting the info by handle. */
4329 || (is_a_symlink && follow_symlinks))
4330 {
4331 BY_HANDLE_FILE_INFORMATION info;
4332
4333 if (is_a_symlink && !follow_symlinks)
4334 file_flags |= FILE_FLAG_OPEN_REPARSE_POINT;
4335 /* READ_CONTROL access rights are required to get security info
4336 by handle. But if the OS doesn't support security in the
4337 first place, we don't need to try. */
4338 if (is_windows_9x () != TRUE)
4339 access_rights |= READ_CONTROL;
4340
4341 fh = CreateFile (name, access_rights, 0, NULL, OPEN_EXISTING,
4342 file_flags, NULL);
4343 /* If CreateFile fails with READ_CONTROL, try again with zero as
4344 access rights. */
4345 if (fh == INVALID_HANDLE_VALUE && access_rights)
4346 fh = CreateFile (name, 0, 0, NULL, OPEN_EXISTING,
4347 file_flags, NULL);
4348 if (fh == INVALID_HANDLE_VALUE)
4349 goto no_true_file_attributes;
4350
4351 /* This is more accurate in terms of getting the correct number
4352 of links, but is quite slow (it is noticeable when Emacs is
4353 making a list of file name completions). */
4354 if (GetFileInformationByHandle (fh, &info))
4355 {
4356 nlinks = info.nNumberOfLinks;
4357 /* Might as well use file index to fake inode values, but this
4358 is not guaranteed to be unique unless we keep a handle open
4359 all the time (even then there are situations where it is
4360 not unique). Reputedly, there are at most 48 bits of info
4361 (on NTFS, presumably less on FAT). */
4362 fake_inode = info.nFileIndexHigh;
4363 fake_inode <<= 32;
4364 fake_inode += info.nFileIndexLow;
4365 serialnum = info.dwVolumeSerialNumber;
4366 fs_high = info.nFileSizeHigh;
4367 fs_low = info.nFileSizeLow;
4368 ctime = info.ftCreationTime;
4369 atime = info.ftLastAccessTime;
4370 wtime = info.ftLastWriteTime;
4371 fattrs = info.dwFileAttributes;
4372 }
4373 else
4374 {
4375 /* We don't go to Plan B here, because it's not clear that
4376 it's a good idea. The only known use case where
4377 CreateFile succeeds, but GetFileInformationByHandle fails
4378 (with ERROR_INVALID_FUNCTION) is for character devices
4379 such as NUL, PRN, etc. For these, switching to Plan B is
4380 a net loss, because we lose the character device
4381 attribute returned by GetFileType below (FindFirstFile
4382 doesn't set that bit in the attributes), and the other
4383 fields don't make sense for character devices anyway.
4384 Emacs doesn't really care for non-file entities in the
4385 context of l?stat, so neither do we. */
4386
4387 /* w32err is assigned so one could put a breakpoint here and
4388 examine its value, when GetFileInformationByHandle
4389 fails. */
4390 DWORD w32err = GetLastError ();
4391
4392 switch (w32err)
4393 {
4394 case ERROR_FILE_NOT_FOUND: /* can this ever happen? */
4395 errno = ENOENT;
4396 return -1;
4397 }
4398 }
4399
4400 /* Test for a symlink before testing for a directory, since
4401 symlinks to directories have the directory bit set, but we
4402 don't want them to appear as directories. */
4403 if (is_a_symlink && !follow_symlinks)
4404 buf->st_mode = S_IFLNK;
4405 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4406 buf->st_mode = S_IFDIR;
4407 else
4408 {
4409 DWORD ftype = GetFileType (fh);
4410
4411 switch (ftype)
4412 {
4413 case FILE_TYPE_DISK:
4414 buf->st_mode = S_IFREG;
4415 break;
4416 case FILE_TYPE_PIPE:
4417 buf->st_mode = S_IFIFO;
4418 break;
4419 case FILE_TYPE_CHAR:
4420 case FILE_TYPE_UNKNOWN:
4421 default:
4422 buf->st_mode = S_IFCHR;
4423 }
4424 }
4425 /* We produce the fallback owner and group data, based on the
4426 current user that runs Emacs, in the following cases:
4427
4428 . caller didn't request owner and group info
4429 . this is Windows 9X
4430 . getting security by handle failed, and we need to produce
4431 information for the target of a symlink (this is better
4432 than producing a potentially misleading info about the
4433 symlink itself)
4434
4435 If getting security by handle fails, and we don't need to
4436 resolve symlinks, we try getting security by name. */
4437 if (!w32_stat_get_owner_group || is_windows_9x () == TRUE)
4438 get_file_owner_and_group (NULL, buf);
4439 else
4440 {
4441 psd = get_file_security_desc_by_handle (fh);
4442 if (psd)
4443 {
4444 get_file_owner_and_group (psd, buf);
4445 LocalFree (psd);
4446 }
4447 else if (!(is_a_symlink && follow_symlinks))
4448 {
4449 psd = get_file_security_desc_by_name (name);
4450 get_file_owner_and_group (psd, buf);
4451 xfree (psd);
4452 }
4453 else
4454 get_file_owner_and_group (NULL, buf);
4455 }
4456 CloseHandle (fh);
4457 }
4458 else
4459 {
4460 no_true_file_attributes:
4461 /* Plan B: Either getting a handle on the file failed, or the
4462 caller explicitly asked us to not bother making this
4463 information more accurate.
4464
4465 Implementation note: In Plan B, we never bother to resolve
4466 symlinks, even if we got here because we tried Plan A and
4467 failed. That's because, even if the caller asked for extra
4468 precision by setting Vw32_get_true_file_attributes to t,
4469 resolving symlinks requires acquiring a file handle to the
4470 symlink, which we already know will fail. And if the user
4471 did not ask for extra precision, resolving symlinks will fly
4472 in the face of that request, since the user then wants the
4473 lightweight version of the code. */
4474 dbcs_p = max_filename_mbslen () > 1;
4475 rootdir = (path >= save_name + len - 1
4476 && (IS_DIRECTORY_SEP (*path) || *path == 0));
4477
4478 /* If name is "c:/.." or "/.." then stat "c:/" or "/". */
4479 r = IS_DEVICE_SEP (name[1]) ? &name[2] : name;
4480 if (IS_DIRECTORY_SEP (r[0])
4481 && r[1] == '.' && r[2] == '.' && r[3] == '\0')
4482 r[1] = r[2] = '\0';
4483
4484 /* Note: If NAME is a symlink to the root of a UNC volume
4485 (i.e. "\\SERVER"), we will not detect that here, and we will
4486 return data about the symlink as result of FindFirst below.
4487 This is unfortunate, but that marginal use case does not
4488 justify a call to chase_symlinks which would impose a penalty
4489 on all the other use cases. (We get here for symlinks to
4490 roots of UNC volumes because CreateFile above fails for them,
4491 unlike with symlinks to root directories X:\ of drives.) */
4492 if (is_unc_volume (name))
4493 {
4494 fattrs = unc_volume_file_attributes (name);
4495 if (fattrs == -1)
4496 return -1;
4497
4498 ctime = atime = wtime = utc_base_ft;
4499 }
4500 else if (rootdir)
4501 {
4502 if (!dbcs_p)
4503 {
4504 if (!IS_DIRECTORY_SEP (name[len-1]))
4505 strcat (name, "\\");
4506 }
4507 else
4508 {
4509 char *end = name + len;
4510 char *n = CharPrevExA (file_name_codepage, name, end, 0);
4511
4512 if (!IS_DIRECTORY_SEP (*n))
4513 strcat (name, "\\");
4514 }
4515 if (GetDriveType (name) < 2)
4516 {
4517 errno = ENOENT;
4518 return -1;
4519 }
4520
4521 fattrs = FILE_ATTRIBUTE_DIRECTORY;
4522 ctime = atime = wtime = utc_base_ft;
4523 }
4524 else
4525 {
4526 if (!dbcs_p)
4527 {
4528 if (IS_DIRECTORY_SEP (name[len-1]))
4529 name[len - 1] = 0;
4530 }
4531 else
4532 {
4533 char *end = name + len;
4534 char *n = CharPrevExA (file_name_codepage, name, end, 0);
4535
4536 if (IS_DIRECTORY_SEP (*n))
4537 *n = 0;
4538 }
4539
4540 /* (This is hacky, but helps when doing file completions on
4541 network drives.) Optimize by using information available from
4542 active readdir if possible. */
4543 len = strlen (dir_pathname);
4544 if (!dbcs_p)
4545 {
4546 if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
4547 len--;
4548 }
4549 else
4550 {
4551 char *end = dir_pathname + len;
4552 char *n = CharPrevExA (file_name_codepage, dir_pathname, end, 0);
4553
4554 if (IS_DIRECTORY_SEP (*n))
4555 len--;
4556 }
4557 if (dir_find_handle != INVALID_HANDLE_VALUE
4558 && !(is_a_symlink && follow_symlinks)
4559 && strnicmp (save_name, dir_pathname, len) == 0
4560 && IS_DIRECTORY_SEP (name[len])
4561 && xstrcasecmp (name + len + 1, dir_static.d_name) == 0)
4562 {
4563 /* This was the last entry returned by readdir. */
4564 wfd = dir_find_data_a; /* FIXME!!! */
4565 }
4566 else
4567 {
4568 logon_network_drive (name);
4569
4570 fh = FindFirstFile (name, &wfd);
4571 if (fh == INVALID_HANDLE_VALUE)
4572 {
4573 errno = ENOENT;
4574 return -1;
4575 }
4576 FindClose (fh);
4577 }
4578 /* Note: if NAME is a symlink, the information we get from
4579 FindFirstFile is for the symlink, not its target. */
4580 fattrs = wfd.dwFileAttributes;
4581 ctime = wfd.ftCreationTime;
4582 atime = wfd.ftLastAccessTime;
4583 wtime = wfd.ftLastWriteTime;
4584 fs_high = wfd.nFileSizeHigh;
4585 fs_low = wfd.nFileSizeLow;
4586 fake_inode = 0;
4587 nlinks = 1;
4588 serialnum = volume_info.serialnum;
4589 }
4590 if (is_a_symlink && !follow_symlinks)
4591 buf->st_mode = S_IFLNK;
4592 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4593 buf->st_mode = S_IFDIR;
4594 else
4595 buf->st_mode = S_IFREG;
4596
4597 get_file_owner_and_group (NULL, buf);
4598 }
4599
4600 #if 0
4601 /* Not sure if there is any point in this. */
4602 if (!NILP (Vw32_generate_fake_inodes))
4603 fake_inode = generate_inode_val (name);
4604 else if (fake_inode == 0)
4605 {
4606 /* For want of something better, try to make everything unique. */
4607 static DWORD gen_num = 0;
4608 fake_inode = ++gen_num;
4609 }
4610 #endif
4611
4612 buf->st_ino = fake_inode;
4613
4614 buf->st_dev = serialnum;
4615 buf->st_rdev = serialnum;
4616
4617 buf->st_size = fs_high;
4618 buf->st_size <<= 32;
4619 buf->st_size += fs_low;
4620 buf->st_nlink = nlinks;
4621
4622 /* Convert timestamps to Unix format. */
4623 buf->st_mtime = convert_time (wtime);
4624 buf->st_atime = convert_time (atime);
4625 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
4626 buf->st_ctime = convert_time (ctime);
4627 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
4628
4629 /* determine rwx permissions */
4630 if (is_a_symlink && !follow_symlinks)
4631 permission = S_IREAD | S_IWRITE | S_IEXEC; /* Posix expectations */
4632 else
4633 {
4634 if (fattrs & FILE_ATTRIBUTE_READONLY)
4635 permission = S_IREAD;
4636 else
4637 permission = S_IREAD | S_IWRITE;
4638
4639 if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4640 permission |= S_IEXEC;
4641 else if (is_exec (name))
4642 permission |= S_IEXEC;
4643 }
4644
4645 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
4646
4647 return 0;
4648 }
4649
4650 int
4651 stat (const char * path, struct stat * buf)
4652 {
4653 return stat_worker (path, buf, 1);
4654 }
4655
4656 int
4657 lstat (const char * path, struct stat * buf)
4658 {
4659 return stat_worker (path, buf, 0);
4660 }
4661
4662 int
4663 fstatat (int fd, char const *name, struct stat *st, int flags)
4664 {
4665 /* Rely on a hack: an open directory is modeled as file descriptor 0.
4666 This is good enough for the current usage in Emacs, but is fragile.
4667
4668 FIXME: Add proper support for fdopendir, fstatat, readlinkat.
4669 Gnulib does this and can serve as a model. */
4670 char fullname[MAX_PATH];
4671
4672 if (fd != AT_FDCWD)
4673 {
4674 if (_snprintf (fullname, sizeof fullname, "%s/%s", dir_pathname, name)
4675 < 0)
4676 {
4677 errno = ENAMETOOLONG;
4678 return -1;
4679 }
4680 name = fullname;
4681 }
4682
4683 return stat_worker (name, st, ! (flags & AT_SYMLINK_NOFOLLOW));
4684 }
4685
4686 /* Provide fstat and utime as well as stat for consistent handling of
4687 file timestamps. */
4688 int
4689 fstat (int desc, struct stat * buf)
4690 {
4691 HANDLE fh = (HANDLE) _get_osfhandle (desc);
4692 BY_HANDLE_FILE_INFORMATION info;
4693 unsigned __int64 fake_inode;
4694 int permission;
4695
4696 switch (GetFileType (fh) & ~FILE_TYPE_REMOTE)
4697 {
4698 case FILE_TYPE_DISK:
4699 buf->st_mode = S_IFREG;
4700 if (!GetFileInformationByHandle (fh, &info))
4701 {
4702 errno = EACCES;
4703 return -1;
4704 }
4705 break;
4706 case FILE_TYPE_PIPE:
4707 buf->st_mode = S_IFIFO;
4708 goto non_disk;
4709 case FILE_TYPE_CHAR:
4710 case FILE_TYPE_UNKNOWN:
4711 default:
4712 buf->st_mode = S_IFCHR;
4713 non_disk:
4714 memset (&info, 0, sizeof (info));
4715 info.dwFileAttributes = 0;
4716 info.ftCreationTime = utc_base_ft;
4717 info.ftLastAccessTime = utc_base_ft;
4718 info.ftLastWriteTime = utc_base_ft;
4719 }
4720
4721 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4722 buf->st_mode = S_IFDIR;
4723
4724 buf->st_nlink = info.nNumberOfLinks;
4725 /* Might as well use file index to fake inode values, but this
4726 is not guaranteed to be unique unless we keep a handle open
4727 all the time (even then there are situations where it is
4728 not unique). Reputedly, there are at most 48 bits of info
4729 (on NTFS, presumably less on FAT). */
4730 fake_inode = info.nFileIndexHigh;
4731 fake_inode <<= 32;
4732 fake_inode += info.nFileIndexLow;
4733
4734 /* MSVC defines _ino_t to be short; other libc's might not. */
4735 if (sizeof (buf->st_ino) == 2)
4736 buf->st_ino = fake_inode ^ (fake_inode >> 16);
4737 else
4738 buf->st_ino = fake_inode;
4739
4740 /* If the caller so requested, get the true file owner and group.
4741 Otherwise, consider the file to belong to the current user. */
4742 if (!w32_stat_get_owner_group || is_windows_9x () == TRUE)
4743 get_file_owner_and_group (NULL, buf);
4744 else
4745 {
4746 PSECURITY_DESCRIPTOR psd = NULL;
4747
4748 psd = get_file_security_desc_by_handle (fh);
4749 if (psd)
4750 {
4751 get_file_owner_and_group (psd, buf);
4752 LocalFree (psd);
4753 }
4754 else
4755 get_file_owner_and_group (NULL, buf);
4756 }
4757
4758 buf->st_dev = info.dwVolumeSerialNumber;
4759 buf->st_rdev = info.dwVolumeSerialNumber;
4760
4761 buf->st_size = info.nFileSizeHigh;
4762 buf->st_size <<= 32;
4763 buf->st_size += info.nFileSizeLow;
4764
4765 /* Convert timestamps to Unix format. */
4766 buf->st_mtime = convert_time (info.ftLastWriteTime);
4767 buf->st_atime = convert_time (info.ftLastAccessTime);
4768 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
4769 buf->st_ctime = convert_time (info.ftCreationTime);
4770 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
4771
4772 /* determine rwx permissions */
4773 if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
4774 permission = S_IREAD;
4775 else
4776 permission = S_IREAD | S_IWRITE;
4777
4778 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4779 permission |= S_IEXEC;
4780 else
4781 {
4782 #if 0 /* no way of knowing the filename */
4783 char * p = strrchr (name, '.');
4784 if (p != NULL &&
4785 (xstrcasecmp (p, ".exe") == 0 ||
4786 xstrcasecmp (p, ".com") == 0 ||
4787 xstrcasecmp (p, ".bat") == 0 ||
4788 xstrcasecmp (p, ".cmd") == 0))
4789 permission |= S_IEXEC;
4790 #endif
4791 }
4792
4793 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
4794
4795 return 0;
4796 }
4797
4798 /* A version of 'utime' which handles directories as well as
4799 files. */
4800
4801 int
4802 utime (const char *name, struct utimbuf *times)
4803 {
4804 struct utimbuf deftime;
4805 HANDLE fh;
4806 FILETIME mtime;
4807 FILETIME atime;
4808
4809 if (times == NULL)
4810 {
4811 deftime.modtime = deftime.actime = time (NULL);
4812 times = &deftime;
4813 }
4814
4815 if (w32_unicode_filenames)
4816 {
4817 wchar_t name_utf16[MAX_PATH];
4818
4819 if (filename_to_utf16 (name, name_utf16) != 0)
4820 return -1; /* errno set by filename_to_utf16 */
4821
4822 /* Need write access to set times. */
4823 fh = CreateFileW (name_utf16, FILE_WRITE_ATTRIBUTES,
4824 /* If NAME specifies a directory, FILE_SHARE_DELETE
4825 allows other processes to delete files inside it,
4826 while we have the directory open. */
4827 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
4828 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
4829 }
4830 else
4831 {
4832 char name_ansi[MAX_PATH];
4833
4834 if (filename_to_ansi (name, name_ansi) != 0)
4835 return -1; /* errno set by filename_to_ansi */
4836
4837 fh = CreateFileA (name_ansi, FILE_WRITE_ATTRIBUTES,
4838 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
4839 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
4840 }
4841 if (fh != INVALID_HANDLE_VALUE)
4842 {
4843 convert_from_time_t (times->actime, &atime);
4844 convert_from_time_t (times->modtime, &mtime);
4845 if (!SetFileTime (fh, NULL, &atime, &mtime))
4846 {
4847 CloseHandle (fh);
4848 errno = EACCES;
4849 return -1;
4850 }
4851 CloseHandle (fh);
4852 }
4853 else
4854 {
4855 DWORD err = GetLastError ();
4856
4857 switch (err)
4858 {
4859 case ERROR_FILE_NOT_FOUND:
4860 case ERROR_PATH_NOT_FOUND:
4861 case ERROR_INVALID_DRIVE:
4862 case ERROR_BAD_NETPATH:
4863 case ERROR_DEV_NOT_EXIST:
4864 /* ERROR_INVALID_NAME is the error CreateFile sets when the
4865 file name includes ?s, i.e. translation to ANSI failed. */
4866 case ERROR_INVALID_NAME:
4867 errno = ENOENT;
4868 break;
4869 case ERROR_TOO_MANY_OPEN_FILES:
4870 errno = ENFILE;
4871 break;
4872 case ERROR_ACCESS_DENIED:
4873 case ERROR_SHARING_VIOLATION:
4874 errno = EACCES;
4875 break;
4876 default:
4877 errno = EINVAL;
4878 break;
4879 }
4880 return -1;
4881 }
4882 return 0;
4883 }
4884
4885 \f
4886 /* Symlink-related functions. */
4887 #ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
4888 #define SYMBOLIC_LINK_FLAG_DIRECTORY 0x1
4889 #endif
4890
4891 int
4892 symlink (char const *filename, char const *linkname)
4893 {
4894 char linkfn[MAX_PATH], *tgtfn;
4895 DWORD flags = 0;
4896 int dir_access, filename_ends_in_slash;
4897 int dbcs_p;
4898
4899 /* Diagnostics follows Posix as much as possible. */
4900 if (filename == NULL || linkname == NULL)
4901 {
4902 errno = EFAULT;
4903 return -1;
4904 }
4905 if (!*filename)
4906 {
4907 errno = ENOENT;
4908 return -1;
4909 }
4910 if (strlen (filename) > MAX_PATH || strlen (linkname) > MAX_PATH)
4911 {
4912 errno = ENAMETOOLONG;
4913 return -1;
4914 }
4915
4916 strcpy (linkfn, map_w32_filename (linkname, NULL));
4917 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0)
4918 {
4919 errno = EPERM;
4920 return -1;
4921 }
4922
4923 dbcs_p = max_filename_mbslen () > 1;
4924
4925 /* Note: since empty FILENAME was already rejected, we can safely
4926 refer to FILENAME[1]. */
4927 if (!(IS_DIRECTORY_SEP (filename[0]) || IS_DEVICE_SEP (filename[1])))
4928 {
4929 /* Non-absolute FILENAME is understood as being relative to
4930 LINKNAME's directory. We need to prepend that directory to
4931 FILENAME to get correct results from faccessat below, since
4932 otherwise it will interpret FILENAME relative to the
4933 directory where the Emacs process runs. Note that
4934 make-symbolic-link always makes sure LINKNAME is a fully
4935 expanded file name. */
4936 char tem[MAX_PATH];
4937 char *p = linkfn + strlen (linkfn);
4938
4939 if (!dbcs_p)
4940 {
4941 while (p > linkfn && !IS_ANY_SEP (p[-1]))
4942 p--;
4943 }
4944 else
4945 {
4946 char *p1 = CharPrevExA (file_name_codepage, linkfn, p, 0);
4947
4948 while (p > linkfn && !IS_ANY_SEP (*p1))
4949 {
4950 p = p1;
4951 p1 = CharPrevExA (file_name_codepage, linkfn, p1, 0);
4952 }
4953 }
4954 if (p > linkfn)
4955 strncpy (tem, linkfn, p - linkfn);
4956 tem[p - linkfn] = '\0';
4957 strcat (tem, filename);
4958 dir_access = faccessat (AT_FDCWD, tem, D_OK, AT_EACCESS);
4959 }
4960 else
4961 dir_access = faccessat (AT_FDCWD, filename, D_OK, AT_EACCESS);
4962
4963 /* Since Windows distinguishes between symlinks to directories and
4964 to files, we provide a kludgy feature: if FILENAME doesn't
4965 exist, but ends in a slash, we create a symlink to directory. If
4966 FILENAME exists and is a directory, we always create a symlink to
4967 directory. */
4968 if (!dbcs_p)
4969 filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
4970 else
4971 {
4972 const char *end = filename + strlen (filename);
4973 const char *n = CharPrevExA (file_name_codepage, filename, end, 0);
4974
4975 filename_ends_in_slash = IS_DIRECTORY_SEP (*n);
4976 }
4977 if (dir_access == 0 || filename_ends_in_slash)
4978 flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
4979
4980 tgtfn = (char *)map_w32_filename (filename, NULL);
4981 if (filename_ends_in_slash)
4982 tgtfn[strlen (tgtfn) - 1] = '\0';
4983
4984 errno = 0;
4985 if (!create_symbolic_link (linkfn, tgtfn, flags))
4986 {
4987 /* ENOSYS is set by create_symbolic_link, when it detects that
4988 the OS doesn't support the CreateSymbolicLink API. */
4989 if (errno != ENOSYS)
4990 {
4991 DWORD w32err = GetLastError ();
4992
4993 switch (w32err)
4994 {
4995 /* ERROR_SUCCESS is sometimes returned when LINKFN and
4996 TGTFN point to the same file name, go figure. */
4997 case ERROR_SUCCESS:
4998 case ERROR_FILE_EXISTS:
4999 errno = EEXIST;
5000 break;
5001 case ERROR_ACCESS_DENIED:
5002 errno = EACCES;
5003 break;
5004 case ERROR_FILE_NOT_FOUND:
5005 case ERROR_PATH_NOT_FOUND:
5006 case ERROR_BAD_NETPATH:
5007 case ERROR_INVALID_REPARSE_DATA:
5008 errno = ENOENT;
5009 break;
5010 case ERROR_DIRECTORY:
5011 errno = EISDIR;
5012 break;
5013 case ERROR_PRIVILEGE_NOT_HELD:
5014 case ERROR_NOT_ALL_ASSIGNED:
5015 errno = EPERM;
5016 break;
5017 case ERROR_DISK_FULL:
5018 errno = ENOSPC;
5019 break;
5020 default:
5021 errno = EINVAL;
5022 break;
5023 }
5024 }
5025 return -1;
5026 }
5027 return 0;
5028 }
5029
5030 /* A quick inexpensive test of whether FILENAME identifies a file that
5031 is a symlink. Returns non-zero if it is, zero otherwise. FILENAME
5032 must already be in the normalized form returned by
5033 map_w32_filename.
5034
5035 Note: for repeated operations on many files, it is best to test
5036 whether the underlying volume actually supports symlinks, by
5037 testing the FILE_SUPPORTS_REPARSE_POINTS bit in volume's flags, and
5038 avoid the call to this function if it doesn't. That's because the
5039 call to GetFileAttributes takes a non-negligible time, especially
5040 on non-local or removable filesystems. See stat_worker for an
5041 example of how to do that. */
5042 static int
5043 is_symlink (const char *filename)
5044 {
5045 DWORD attrs;
5046 WIN32_FIND_DATA wfd;
5047 HANDLE fh;
5048
5049 attrs = GetFileAttributes (filename);
5050 if (attrs == -1)
5051 {
5052 DWORD w32err = GetLastError ();
5053
5054 switch (w32err)
5055 {
5056 case ERROR_BAD_NETPATH: /* network share, can't be a symlink */
5057 break;
5058 case ERROR_ACCESS_DENIED:
5059 errno = EACCES;
5060 break;
5061 case ERROR_FILE_NOT_FOUND:
5062 case ERROR_PATH_NOT_FOUND:
5063 default:
5064 errno = ENOENT;
5065 break;
5066 }
5067 return 0;
5068 }
5069 if ((attrs & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
5070 return 0;
5071 logon_network_drive (filename);
5072 fh = FindFirstFile (filename, &wfd);
5073 if (fh == INVALID_HANDLE_VALUE)
5074 return 0;
5075 FindClose (fh);
5076 return (wfd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0
5077 && (wfd.dwReserved0 & IO_REPARSE_TAG_SYMLINK) == IO_REPARSE_TAG_SYMLINK;
5078 }
5079
5080 /* If NAME identifies a symbolic link, copy into BUF the file name of
5081 the symlink's target. Copy at most BUF_SIZE bytes, and do NOT
5082 null-terminate the target name, even if it fits. Return the number
5083 of bytes copied, or -1 if NAME is not a symlink or any error was
5084 encountered while resolving it. The file name copied into BUF is
5085 encoded in the current ANSI codepage. */
5086 ssize_t
5087 readlink (const char *name, char *buf, size_t buf_size)
5088 {
5089 const char *path;
5090 TOKEN_PRIVILEGES privs;
5091 int restore_privs = 0;
5092 HANDLE sh;
5093 ssize_t retval;
5094
5095 if (name == NULL)
5096 {
5097 errno = EFAULT;
5098 return -1;
5099 }
5100 if (!*name)
5101 {
5102 errno = ENOENT;
5103 return -1;
5104 }
5105
5106 path = map_w32_filename (name, NULL);
5107
5108 if (strlen (path) > MAX_PATH)
5109 {
5110 errno = ENAMETOOLONG;
5111 return -1;
5112 }
5113
5114 errno = 0;
5115 if (is_windows_9x () == TRUE
5116 || (volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0
5117 || !is_symlink (path))
5118 {
5119 if (!errno)
5120 errno = EINVAL; /* not a symlink */
5121 return -1;
5122 }
5123
5124 /* Done with simple tests, now we're in for some _real_ work. */
5125 if (enable_privilege (SE_BACKUP_NAME, TRUE, &privs))
5126 restore_privs = 1;
5127 /* Implementation note: From here and onward, don't return early,
5128 since that will fail to restore the original set of privileges of
5129 the calling thread. */
5130
5131 retval = -1; /* not too optimistic, are we? */
5132
5133 /* Note: In the next call to CreateFile, we use zero as the 2nd
5134 argument because, when the symlink is a hidden/system file,
5135 e.g. 'C:\Users\All Users', GENERIC_READ fails with
5136 ERROR_ACCESS_DENIED. Zero seems to work just fine, both for file
5137 and directory symlinks. */
5138 sh = CreateFile (path, 0, 0, NULL, OPEN_EXISTING,
5139 FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
5140 NULL);
5141 if (sh != INVALID_HANDLE_VALUE)
5142 {
5143 BYTE reparse_buf[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
5144 REPARSE_DATA_BUFFER *reparse_data = (REPARSE_DATA_BUFFER *)&reparse_buf[0];
5145 DWORD retbytes;
5146
5147 if (!DeviceIoControl (sh, FSCTL_GET_REPARSE_POINT, NULL, 0,
5148 reparse_buf, MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
5149 &retbytes, NULL))
5150 errno = EIO;
5151 else if (reparse_data->ReparseTag != IO_REPARSE_TAG_SYMLINK)
5152 errno = EINVAL;
5153 else
5154 {
5155 /* Copy the link target name, in wide characters, from
5156 reparse_data, then convert it to multibyte encoding in
5157 the current locale's codepage. */
5158 WCHAR *lwname;
5159 BYTE lname[MAX_PATH];
5160 USHORT lname_len;
5161 USHORT lwname_len =
5162 reparse_data->SymbolicLinkReparseBuffer.PrintNameLength;
5163 WCHAR *lwname_src =
5164 reparse_data->SymbolicLinkReparseBuffer.PathBuffer
5165 + reparse_data->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR);
5166 /* This updates file_name_codepage which we need below. */
5167 int dbcs_p = max_filename_mbslen () > 1;
5168
5169 /* According to MSDN, PrintNameLength does not include the
5170 terminating null character. */
5171 lwname = alloca ((lwname_len + 1) * sizeof(WCHAR));
5172 memcpy (lwname, lwname_src, lwname_len);
5173 lwname[lwname_len/sizeof(WCHAR)] = 0; /* null-terminate */
5174
5175 lname_len = WideCharToMultiByte (file_name_codepage, 0, lwname, -1,
5176 lname, MAX_PATH, NULL, NULL);
5177 if (!lname_len)
5178 {
5179 /* WideCharToMultiByte failed. */
5180 DWORD w32err1 = GetLastError ();
5181
5182 switch (w32err1)
5183 {
5184 case ERROR_INSUFFICIENT_BUFFER:
5185 errno = ENAMETOOLONG;
5186 break;
5187 case ERROR_INVALID_PARAMETER:
5188 errno = EFAULT;
5189 break;
5190 case ERROR_NO_UNICODE_TRANSLATION:
5191 errno = ENOENT;
5192 break;
5193 default:
5194 errno = EINVAL;
5195 break;
5196 }
5197 }
5198 else
5199 {
5200 size_t size_to_copy = buf_size;
5201 BYTE *p = lname, *p2;
5202 BYTE *pend = p + lname_len;
5203
5204 /* Normalize like dostounix_filename does, but we don't
5205 want to assume that lname is null-terminated. */
5206 if (dbcs_p)
5207 p2 = CharNextExA (file_name_codepage, p, 0);
5208 else
5209 p2 = p + 1;
5210 if (*p && *p2 == ':' && *p >= 'A' && *p <= 'Z')
5211 {
5212 *p += 'a' - 'A';
5213 p += 2;
5214 }
5215 while (p <= pend)
5216 {
5217 if (*p == '\\')
5218 *p = '/';
5219 if (dbcs_p)
5220 {
5221 p = CharNextExA (file_name_codepage, p, 0);
5222 /* CharNextExA doesn't advance at null character. */
5223 if (!*p)
5224 break;
5225 }
5226 else
5227 ++p;
5228 }
5229 /* Testing for null-terminated LNAME is paranoia:
5230 WideCharToMultiByte should always return a
5231 null-terminated string when its 4th argument is -1
5232 and its 3rd argument is null-terminated (which they
5233 are, see above). */
5234 if (lname[lname_len - 1] == '\0')
5235 lname_len--;
5236 if (lname_len <= buf_size)
5237 size_to_copy = lname_len;
5238 strncpy (buf, lname, size_to_copy);
5239 /* Success! */
5240 retval = size_to_copy;
5241 }
5242 }
5243 CloseHandle (sh);
5244 }
5245 else
5246 {
5247 /* CreateFile failed. */
5248 DWORD w32err2 = GetLastError ();
5249
5250 switch (w32err2)
5251 {
5252 case ERROR_FILE_NOT_FOUND:
5253 case ERROR_PATH_NOT_FOUND:
5254 errno = ENOENT;
5255 break;
5256 case ERROR_ACCESS_DENIED:
5257 case ERROR_TOO_MANY_OPEN_FILES:
5258 errno = EACCES;
5259 break;
5260 default:
5261 errno = EPERM;
5262 break;
5263 }
5264 }
5265 if (restore_privs)
5266 {
5267 restore_privilege (&privs);
5268 revert_to_self ();
5269 }
5270
5271 return retval;
5272 }
5273
5274 ssize_t
5275 readlinkat (int fd, char const *name, char *buffer,
5276 size_t buffer_size)
5277 {
5278 /* Rely on a hack: an open directory is modeled as file descriptor 0,
5279 as in fstatat. FIXME: Add proper support for readlinkat. */
5280 char fullname[MAX_PATH];
5281
5282 if (fd != AT_FDCWD)
5283 {
5284 if (_snprintf (fullname, sizeof fullname, "%s/%s", dir_pathname, name)
5285 < 0)
5286 {
5287 errno = ENAMETOOLONG;
5288 return -1;
5289 }
5290 name = fullname;
5291 }
5292
5293 return readlink (name, buffer, buffer_size);
5294 }
5295
5296 /* If FILE is a symlink, return its target (stored in a static
5297 buffer); otherwise return FILE.
5298
5299 This function repeatedly resolves symlinks in the last component of
5300 a chain of symlink file names, as in foo -> bar -> baz -> ...,
5301 until it arrives at a file whose last component is not a symlink,
5302 or some error occurs. It returns the target of the last
5303 successfully resolved symlink in the chain. If it succeeds to
5304 resolve even a single symlink, the value returned is an absolute
5305 file name with backslashes (result of GetFullPathName). By
5306 contrast, if the original FILE is returned, it is unaltered.
5307
5308 Note: This function can set errno even if it succeeds.
5309
5310 Implementation note: we only resolve the last portion ("basename")
5311 of the argument FILE and of each following file in the chain,
5312 disregarding any possible symlinks in its leading directories.
5313 This is because Windows system calls and library functions
5314 transparently resolve symlinks in leading directories and return
5315 correct information, as long as the basename is not a symlink. */
5316 static char *
5317 chase_symlinks (const char *file)
5318 {
5319 static char target[MAX_PATH];
5320 char link[MAX_PATH];
5321 ssize_t res, link_len;
5322 int loop_count = 0;
5323 int dbcs_p;
5324
5325 if (is_windows_9x () == TRUE || !is_symlink (file))
5326 return (char *)file;
5327
5328 if ((link_len = GetFullPathName (file, MAX_PATH, link, NULL)) == 0)
5329 return (char *)file;
5330
5331 dbcs_p = max_filename_mbslen () > 1;
5332 target[0] = '\0';
5333 do {
5334
5335 /* Remove trailing slashes, as we want to resolve the last
5336 non-trivial part of the link name. */
5337 if (!dbcs_p)
5338 {
5339 while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
5340 link[link_len--] = '\0';
5341 }
5342 else if (link_len > 3)
5343 {
5344 char *n = CharPrevExA (file_name_codepage, link, link + link_len, 0);
5345
5346 while (n >= link + 2 && IS_DIRECTORY_SEP (*n))
5347 {
5348 n[1] = '\0';
5349 n = CharPrevExA (file_name_codepage, link, n, 0);
5350 }
5351 }
5352
5353 res = readlink (link, target, MAX_PATH);
5354 if (res > 0)
5355 {
5356 target[res] = '\0';
5357 if (!(IS_DEVICE_SEP (target[1])
5358 || (IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))))
5359 {
5360 /* Target is relative. Append it to the directory part of
5361 the symlink, then copy the result back to target. */
5362 char *p = link + link_len;
5363
5364 if (!dbcs_p)
5365 {
5366 while (p > link && !IS_ANY_SEP (p[-1]))
5367 p--;
5368 }
5369 else
5370 {
5371 char *p1 = CharPrevExA (file_name_codepage, link, p, 0);
5372
5373 while (p > link && !IS_ANY_SEP (*p1))
5374 {
5375 p = p1;
5376 p1 = CharPrevExA (file_name_codepage, link, p1, 0);
5377 }
5378 }
5379 strcpy (p, target);
5380 strcpy (target, link);
5381 }
5382 /* Resolve any "." and ".." to get a fully-qualified file name
5383 in link[] again. */
5384 link_len = GetFullPathName (target, MAX_PATH, link, NULL);
5385 }
5386 } while (res > 0 && link_len > 0 && ++loop_count <= 100);
5387
5388 if (loop_count > 100)
5389 errno = ELOOP;
5390
5391 if (target[0] == '\0') /* not a single call to readlink succeeded */
5392 return (char *)file;
5393 return target;
5394 }
5395
5396 \f
5397 /* Posix ACL emulation. */
5398
5399 int
5400 acl_valid (acl_t acl)
5401 {
5402 return is_valid_security_descriptor ((PSECURITY_DESCRIPTOR)acl) ? 0 : -1;
5403 }
5404
5405 char *
5406 acl_to_text (acl_t acl, ssize_t *size)
5407 {
5408 LPTSTR str_acl;
5409 SECURITY_INFORMATION flags =
5410 OWNER_SECURITY_INFORMATION |
5411 GROUP_SECURITY_INFORMATION |
5412 DACL_SECURITY_INFORMATION;
5413 char *retval = NULL;
5414 ULONG local_size;
5415 int e = errno;
5416
5417 errno = 0;
5418
5419 if (convert_sd_to_sddl ((PSECURITY_DESCRIPTOR)acl, SDDL_REVISION_1, flags, &str_acl, &local_size))
5420 {
5421 errno = e;
5422 /* We don't want to mix heaps, so we duplicate the string in our
5423 heap and free the one allocated by the API. */
5424 retval = xstrdup (str_acl);
5425 if (size)
5426 *size = local_size;
5427 LocalFree (str_acl);
5428 }
5429 else if (errno != ENOTSUP)
5430 errno = EINVAL;
5431
5432 return retval;
5433 }
5434
5435 acl_t
5436 acl_from_text (const char *acl_str)
5437 {
5438 PSECURITY_DESCRIPTOR psd, retval = NULL;
5439 ULONG sd_size;
5440 int e = errno;
5441
5442 errno = 0;
5443
5444 if (convert_sddl_to_sd (acl_str, SDDL_REVISION_1, &psd, &sd_size))
5445 {
5446 errno = e;
5447 retval = xmalloc (sd_size);
5448 memcpy (retval, psd, sd_size);
5449 LocalFree (psd);
5450 }
5451 else if (errno != ENOTSUP)
5452 errno = EINVAL;
5453
5454 return retval;
5455 }
5456
5457 int
5458 acl_free (void *ptr)
5459 {
5460 xfree (ptr);
5461 return 0;
5462 }
5463
5464 acl_t
5465 acl_get_file (const char *fname, acl_type_t type)
5466 {
5467 PSECURITY_DESCRIPTOR psd = NULL;
5468 const char *filename;
5469
5470 if (type == ACL_TYPE_ACCESS)
5471 {
5472 DWORD sd_len, err;
5473 SECURITY_INFORMATION si =
5474 OWNER_SECURITY_INFORMATION |
5475 GROUP_SECURITY_INFORMATION |
5476 DACL_SECURITY_INFORMATION ;
5477 int e = errno;
5478
5479 filename = map_w32_filename (fname, NULL);
5480 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
5481 fname = chase_symlinks (filename);
5482 else
5483 fname = filename;
5484
5485 errno = 0;
5486 if (!get_file_security (fname, si, psd, 0, &sd_len)
5487 && errno != ENOTSUP)
5488 {
5489 err = GetLastError ();
5490 if (err == ERROR_INSUFFICIENT_BUFFER)
5491 {
5492 psd = xmalloc (sd_len);
5493 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
5494 {
5495 xfree (psd);
5496 errno = EIO;
5497 psd = NULL;
5498 }
5499 }
5500 else if (err == ERROR_FILE_NOT_FOUND
5501 || err == ERROR_PATH_NOT_FOUND)
5502 errno = ENOENT;
5503 else
5504 errno = EIO;
5505 }
5506 else if (!errno)
5507 errno = e;
5508 }
5509 else if (type != ACL_TYPE_DEFAULT)
5510 errno = EINVAL;
5511
5512 return psd;
5513 }
5514
5515 int
5516 acl_set_file (const char *fname, acl_type_t type, acl_t acl)
5517 {
5518 TOKEN_PRIVILEGES old1, old2;
5519 DWORD err;
5520 int st = 0, retval = -1;
5521 SECURITY_INFORMATION flags = 0;
5522 PSID psid;
5523 PACL pacl;
5524 BOOL dflt;
5525 BOOL dacl_present;
5526 int e;
5527 const char *filename;
5528
5529 if (acl_valid (acl) != 0
5530 || (type != ACL_TYPE_DEFAULT && type != ACL_TYPE_ACCESS))
5531 {
5532 errno = EINVAL;
5533 return -1;
5534 }
5535
5536 if (type == ACL_TYPE_DEFAULT)
5537 {
5538 errno = ENOSYS;
5539 return -1;
5540 }
5541
5542 filename = map_w32_filename (fname, NULL);
5543 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
5544 fname = chase_symlinks (filename);
5545 else
5546 fname = filename;
5547
5548 if (get_security_descriptor_owner ((PSECURITY_DESCRIPTOR)acl, &psid, &dflt)
5549 && psid)
5550 flags |= OWNER_SECURITY_INFORMATION;
5551 if (get_security_descriptor_group ((PSECURITY_DESCRIPTOR)acl, &psid, &dflt)
5552 && psid)
5553 flags |= GROUP_SECURITY_INFORMATION;
5554 if (get_security_descriptor_dacl ((PSECURITY_DESCRIPTOR)acl, &dacl_present,
5555 &pacl, &dflt)
5556 && dacl_present)
5557 flags |= DACL_SECURITY_INFORMATION;
5558 if (!flags)
5559 return 0;
5560
5561 /* According to KB-245153, setting the owner will succeed if either:
5562 (1) the caller is the user who will be the new owner, and has the
5563 SE_TAKE_OWNERSHIP privilege, or
5564 (2) the caller has the SE_RESTORE privilege, in which case she can
5565 set any valid user or group as the owner
5566
5567 We request below both SE_TAKE_OWNERSHIP and SE_RESTORE
5568 privileges, and disregard any failures in obtaining them. If
5569 these privileges cannot be obtained, and do not already exist in
5570 the calling thread's security token, this function could fail
5571 with EPERM. */
5572 if (enable_privilege (SE_TAKE_OWNERSHIP_NAME, TRUE, &old1))
5573 st++;
5574 if (enable_privilege (SE_RESTORE_NAME, TRUE, &old2))
5575 st++;
5576
5577 e = errno;
5578 errno = 0;
5579 if (!set_file_security ((char *)fname, flags, (PSECURITY_DESCRIPTOR)acl))
5580 {
5581 err = GetLastError ();
5582
5583 if (errno == ENOTSUP)
5584 ;
5585 else if (err == ERROR_INVALID_OWNER
5586 || err == ERROR_NOT_ALL_ASSIGNED
5587 || err == ERROR_ACCESS_DENIED)
5588 {
5589 /* Maybe the requested ACL and the one the file already has
5590 are identical, in which case we can silently ignore the
5591 failure. (And no, Windows doesn't.) */
5592 acl_t current_acl = acl_get_file (fname, ACL_TYPE_ACCESS);
5593
5594 errno = EPERM;
5595 if (current_acl)
5596 {
5597 char *acl_from = acl_to_text (current_acl, NULL);
5598 char *acl_to = acl_to_text (acl, NULL);
5599
5600 if (acl_from && acl_to && xstrcasecmp (acl_from, acl_to) == 0)
5601 {
5602 retval = 0;
5603 errno = e;
5604 }
5605 if (acl_from)
5606 acl_free (acl_from);
5607 if (acl_to)
5608 acl_free (acl_to);
5609 acl_free (current_acl);
5610 }
5611 }
5612 else if (err == ERROR_FILE_NOT_FOUND || err == ERROR_PATH_NOT_FOUND)
5613 errno = ENOENT;
5614 else
5615 errno = EACCES;
5616 }
5617 else
5618 {
5619 retval = 0;
5620 errno = e;
5621 }
5622
5623 if (st)
5624 {
5625 if (st >= 2)
5626 restore_privilege (&old2);
5627 restore_privilege (&old1);
5628 revert_to_self ();
5629 }
5630
5631 return retval;
5632 }
5633
5634 \f
5635 /* MS-Windows version of careadlinkat (cf. ../lib/careadlinkat.c). We
5636 have a fixed max size for file names, so we don't need the kind of
5637 alloc/malloc/realloc dance the gnulib version does. We also don't
5638 support FD-relative symlinks. */
5639 char *
5640 careadlinkat (int fd, char const *filename,
5641 char *buffer, size_t buffer_size,
5642 struct allocator const *alloc,
5643 ssize_t (*preadlinkat) (int, char const *, char *, size_t))
5644 {
5645 char linkname[MAX_PATH];
5646 ssize_t link_size;
5647
5648 link_size = preadlinkat (fd, filename, linkname, sizeof(linkname));
5649
5650 if (link_size > 0)
5651 {
5652 char *retval = buffer;
5653
5654 linkname[link_size++] = '\0';
5655 if (link_size > buffer_size)
5656 retval = (char *)(alloc ? alloc->allocate : xmalloc) (link_size);
5657 if (retval)
5658 memcpy (retval, linkname, link_size);
5659
5660 return retval;
5661 }
5662 return NULL;
5663 }
5664
5665 \f
5666 /* Support for browsing other processes and their attributes. See
5667 process.c for the Lisp bindings. */
5668
5669 /* Helper wrapper functions. */
5670
5671 static HANDLE WINAPI
5672 create_toolhelp32_snapshot (DWORD Flags, DWORD Ignored)
5673 {
5674 static CreateToolhelp32Snapshot_Proc s_pfn_Create_Toolhelp32_Snapshot = NULL;
5675
5676 if (g_b_init_create_toolhelp32_snapshot == 0)
5677 {
5678 g_b_init_create_toolhelp32_snapshot = 1;
5679 s_pfn_Create_Toolhelp32_Snapshot = (CreateToolhelp32Snapshot_Proc)
5680 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5681 "CreateToolhelp32Snapshot");
5682 }
5683 if (s_pfn_Create_Toolhelp32_Snapshot == NULL)
5684 {
5685 return INVALID_HANDLE_VALUE;
5686 }
5687 return (s_pfn_Create_Toolhelp32_Snapshot (Flags, Ignored));
5688 }
5689
5690 static BOOL WINAPI
5691 process32_first (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
5692 {
5693 static Process32First_Proc s_pfn_Process32_First = NULL;
5694
5695 if (g_b_init_process32_first == 0)
5696 {
5697 g_b_init_process32_first = 1;
5698 s_pfn_Process32_First = (Process32First_Proc)
5699 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5700 "Process32First");
5701 }
5702 if (s_pfn_Process32_First == NULL)
5703 {
5704 return FALSE;
5705 }
5706 return (s_pfn_Process32_First (hSnapshot, lppe));
5707 }
5708
5709 static BOOL WINAPI
5710 process32_next (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
5711 {
5712 static Process32Next_Proc s_pfn_Process32_Next = NULL;
5713
5714 if (g_b_init_process32_next == 0)
5715 {
5716 g_b_init_process32_next = 1;
5717 s_pfn_Process32_Next = (Process32Next_Proc)
5718 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5719 "Process32Next");
5720 }
5721 if (s_pfn_Process32_Next == NULL)
5722 {
5723 return FALSE;
5724 }
5725 return (s_pfn_Process32_Next (hSnapshot, lppe));
5726 }
5727
5728 static BOOL WINAPI
5729 open_thread_token (HANDLE ThreadHandle,
5730 DWORD DesiredAccess,
5731 BOOL OpenAsSelf,
5732 PHANDLE TokenHandle)
5733 {
5734 static OpenThreadToken_Proc s_pfn_Open_Thread_Token = NULL;
5735 HMODULE hm_advapi32 = NULL;
5736 if (is_windows_9x () == TRUE)
5737 {
5738 SetLastError (ERROR_NOT_SUPPORTED);
5739 return FALSE;
5740 }
5741 if (g_b_init_open_thread_token == 0)
5742 {
5743 g_b_init_open_thread_token = 1;
5744 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5745 s_pfn_Open_Thread_Token =
5746 (OpenThreadToken_Proc) GetProcAddress (hm_advapi32, "OpenThreadToken");
5747 }
5748 if (s_pfn_Open_Thread_Token == NULL)
5749 {
5750 SetLastError (ERROR_NOT_SUPPORTED);
5751 return FALSE;
5752 }
5753 return (
5754 s_pfn_Open_Thread_Token (
5755 ThreadHandle,
5756 DesiredAccess,
5757 OpenAsSelf,
5758 TokenHandle)
5759 );
5760 }
5761
5762 static BOOL WINAPI
5763 impersonate_self (SECURITY_IMPERSONATION_LEVEL ImpersonationLevel)
5764 {
5765 static ImpersonateSelf_Proc s_pfn_Impersonate_Self = NULL;
5766 HMODULE hm_advapi32 = NULL;
5767 if (is_windows_9x () == TRUE)
5768 {
5769 return FALSE;
5770 }
5771 if (g_b_init_impersonate_self == 0)
5772 {
5773 g_b_init_impersonate_self = 1;
5774 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5775 s_pfn_Impersonate_Self =
5776 (ImpersonateSelf_Proc) GetProcAddress (hm_advapi32, "ImpersonateSelf");
5777 }
5778 if (s_pfn_Impersonate_Self == NULL)
5779 {
5780 return FALSE;
5781 }
5782 return s_pfn_Impersonate_Self (ImpersonationLevel);
5783 }
5784
5785 static BOOL WINAPI
5786 revert_to_self (void)
5787 {
5788 static RevertToSelf_Proc s_pfn_Revert_To_Self = NULL;
5789 HMODULE hm_advapi32 = NULL;
5790 if (is_windows_9x () == TRUE)
5791 {
5792 return FALSE;
5793 }
5794 if (g_b_init_revert_to_self == 0)
5795 {
5796 g_b_init_revert_to_self = 1;
5797 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5798 s_pfn_Revert_To_Self =
5799 (RevertToSelf_Proc) GetProcAddress (hm_advapi32, "RevertToSelf");
5800 }
5801 if (s_pfn_Revert_To_Self == NULL)
5802 {
5803 return FALSE;
5804 }
5805 return s_pfn_Revert_To_Self ();
5806 }
5807
5808 static BOOL WINAPI
5809 get_process_memory_info (HANDLE h_proc,
5810 PPROCESS_MEMORY_COUNTERS mem_counters,
5811 DWORD bufsize)
5812 {
5813 static GetProcessMemoryInfo_Proc s_pfn_Get_Process_Memory_Info = NULL;
5814 HMODULE hm_psapi = NULL;
5815 if (is_windows_9x () == TRUE)
5816 {
5817 return FALSE;
5818 }
5819 if (g_b_init_get_process_memory_info == 0)
5820 {
5821 g_b_init_get_process_memory_info = 1;
5822 hm_psapi = LoadLibrary ("Psapi.dll");
5823 if (hm_psapi)
5824 s_pfn_Get_Process_Memory_Info = (GetProcessMemoryInfo_Proc)
5825 GetProcAddress (hm_psapi, "GetProcessMemoryInfo");
5826 }
5827 if (s_pfn_Get_Process_Memory_Info == NULL)
5828 {
5829 return FALSE;
5830 }
5831 return s_pfn_Get_Process_Memory_Info (h_proc, mem_counters, bufsize);
5832 }
5833
5834 static BOOL WINAPI
5835 get_process_working_set_size (HANDLE h_proc,
5836 PSIZE_T minrss,
5837 PSIZE_T maxrss)
5838 {
5839 static GetProcessWorkingSetSize_Proc
5840 s_pfn_Get_Process_Working_Set_Size = NULL;
5841
5842 if (is_windows_9x () == TRUE)
5843 {
5844 return FALSE;
5845 }
5846 if (g_b_init_get_process_working_set_size == 0)
5847 {
5848 g_b_init_get_process_working_set_size = 1;
5849 s_pfn_Get_Process_Working_Set_Size = (GetProcessWorkingSetSize_Proc)
5850 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5851 "GetProcessWorkingSetSize");
5852 }
5853 if (s_pfn_Get_Process_Working_Set_Size == NULL)
5854 {
5855 return FALSE;
5856 }
5857 return s_pfn_Get_Process_Working_Set_Size (h_proc, minrss, maxrss);
5858 }
5859
5860 static BOOL WINAPI
5861 global_memory_status (MEMORYSTATUS *buf)
5862 {
5863 static GlobalMemoryStatus_Proc s_pfn_Global_Memory_Status = NULL;
5864
5865 if (is_windows_9x () == TRUE)
5866 {
5867 return FALSE;
5868 }
5869 if (g_b_init_global_memory_status == 0)
5870 {
5871 g_b_init_global_memory_status = 1;
5872 s_pfn_Global_Memory_Status = (GlobalMemoryStatus_Proc)
5873 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5874 "GlobalMemoryStatus");
5875 }
5876 if (s_pfn_Global_Memory_Status == NULL)
5877 {
5878 return FALSE;
5879 }
5880 return s_pfn_Global_Memory_Status (buf);
5881 }
5882
5883 static BOOL WINAPI
5884 global_memory_status_ex (MEMORY_STATUS_EX *buf)
5885 {
5886 static GlobalMemoryStatusEx_Proc s_pfn_Global_Memory_Status_Ex = NULL;
5887
5888 if (is_windows_9x () == TRUE)
5889 {
5890 return FALSE;
5891 }
5892 if (g_b_init_global_memory_status_ex == 0)
5893 {
5894 g_b_init_global_memory_status_ex = 1;
5895 s_pfn_Global_Memory_Status_Ex = (GlobalMemoryStatusEx_Proc)
5896 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5897 "GlobalMemoryStatusEx");
5898 }
5899 if (s_pfn_Global_Memory_Status_Ex == NULL)
5900 {
5901 return FALSE;
5902 }
5903 return s_pfn_Global_Memory_Status_Ex (buf);
5904 }
5905
5906 Lisp_Object
5907 list_system_processes (void)
5908 {
5909 struct gcpro gcpro1;
5910 Lisp_Object proclist = Qnil;
5911 HANDLE h_snapshot;
5912
5913 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
5914
5915 if (h_snapshot != INVALID_HANDLE_VALUE)
5916 {
5917 PROCESSENTRY32 proc_entry;
5918 DWORD proc_id;
5919 BOOL res;
5920
5921 GCPRO1 (proclist);
5922
5923 proc_entry.dwSize = sizeof (PROCESSENTRY32);
5924 for (res = process32_first (h_snapshot, &proc_entry); res;
5925 res = process32_next (h_snapshot, &proc_entry))
5926 {
5927 proc_id = proc_entry.th32ProcessID;
5928 proclist = Fcons (make_fixnum_or_float (proc_id), proclist);
5929 }
5930
5931 CloseHandle (h_snapshot);
5932 UNGCPRO;
5933 proclist = Fnreverse (proclist);
5934 }
5935
5936 return proclist;
5937 }
5938
5939 static int
5940 enable_privilege (LPCTSTR priv_name, BOOL enable_p, TOKEN_PRIVILEGES *old_priv)
5941 {
5942 TOKEN_PRIVILEGES priv;
5943 DWORD priv_size = sizeof (priv);
5944 DWORD opriv_size = sizeof (*old_priv);
5945 HANDLE h_token = NULL;
5946 HANDLE h_thread = GetCurrentThread ();
5947 int ret_val = 0;
5948 BOOL res;
5949
5950 res = open_thread_token (h_thread,
5951 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5952 FALSE, &h_token);
5953 if (!res && GetLastError () == ERROR_NO_TOKEN)
5954 {
5955 if (impersonate_self (SecurityImpersonation))
5956 res = open_thread_token (h_thread,
5957 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5958 FALSE, &h_token);
5959 }
5960 if (res)
5961 {
5962 priv.PrivilegeCount = 1;
5963 priv.Privileges[0].Attributes = enable_p ? SE_PRIVILEGE_ENABLED : 0;
5964 LookupPrivilegeValue (NULL, priv_name, &priv.Privileges[0].Luid);
5965 if (AdjustTokenPrivileges (h_token, FALSE, &priv, priv_size,
5966 old_priv, &opriv_size)
5967 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
5968 ret_val = 1;
5969 }
5970 if (h_token)
5971 CloseHandle (h_token);
5972
5973 return ret_val;
5974 }
5975
5976 static int
5977 restore_privilege (TOKEN_PRIVILEGES *priv)
5978 {
5979 DWORD priv_size = sizeof (*priv);
5980 HANDLE h_token = NULL;
5981 int ret_val = 0;
5982
5983 if (open_thread_token (GetCurrentThread (),
5984 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5985 FALSE, &h_token))
5986 {
5987 if (AdjustTokenPrivileges (h_token, FALSE, priv, priv_size, NULL, NULL)
5988 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
5989 ret_val = 1;
5990 }
5991 if (h_token)
5992 CloseHandle (h_token);
5993
5994 return ret_val;
5995 }
5996
5997 static Lisp_Object
5998 ltime (ULONGLONG time_100ns)
5999 {
6000 ULONGLONG time_sec = time_100ns / 10000000;
6001 int subsec = time_100ns % 10000000;
6002 return list4i (time_sec >> 16, time_sec & 0xffff,
6003 subsec / 10, subsec % 10 * 100000);
6004 }
6005
6006 #define U64_TO_LISP_TIME(time) ltime (time)
6007
6008 static int
6009 process_times (HANDLE h_proc, Lisp_Object *ctime, Lisp_Object *etime,
6010 Lisp_Object *stime, Lisp_Object *utime, Lisp_Object *ttime,
6011 double *pcpu)
6012 {
6013 FILETIME ft_creation, ft_exit, ft_kernel, ft_user, ft_current;
6014 ULONGLONG tem1, tem2, tem3, tem;
6015
6016 if (!h_proc
6017 || !get_process_times_fn
6018 || !(*get_process_times_fn) (h_proc, &ft_creation, &ft_exit,
6019 &ft_kernel, &ft_user))
6020 return 0;
6021
6022 GetSystemTimeAsFileTime (&ft_current);
6023
6024 FILETIME_TO_U64 (tem1, ft_kernel);
6025 *stime = U64_TO_LISP_TIME (tem1);
6026
6027 FILETIME_TO_U64 (tem2, ft_user);
6028 *utime = U64_TO_LISP_TIME (tem2);
6029
6030 tem3 = tem1 + tem2;
6031 *ttime = U64_TO_LISP_TIME (tem3);
6032
6033 FILETIME_TO_U64 (tem, ft_creation);
6034 /* Process no 4 (System) returns zero creation time. */
6035 if (tem)
6036 tem -= utc_base;
6037 *ctime = U64_TO_LISP_TIME (tem);
6038
6039 if (tem)
6040 {
6041 FILETIME_TO_U64 (tem3, ft_current);
6042 tem = (tem3 - utc_base) - tem;
6043 }
6044 *etime = U64_TO_LISP_TIME (tem);
6045
6046 if (tem)
6047 {
6048 *pcpu = 100.0 * (tem1 + tem2) / tem;
6049 if (*pcpu > 100)
6050 *pcpu = 100.0;
6051 }
6052 else
6053 *pcpu = 0;
6054
6055 return 1;
6056 }
6057
6058 Lisp_Object
6059 system_process_attributes (Lisp_Object pid)
6060 {
6061 struct gcpro gcpro1, gcpro2, gcpro3;
6062 Lisp_Object attrs = Qnil;
6063 Lisp_Object cmd_str, decoded_cmd, tem;
6064 HANDLE h_snapshot, h_proc;
6065 DWORD proc_id;
6066 int found_proc = 0;
6067 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
6068 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
6069 DWORD glength = sizeof (gname);
6070 HANDLE token = NULL;
6071 SID_NAME_USE user_type;
6072 unsigned char *buf = NULL;
6073 DWORD blen = 0;
6074 TOKEN_USER user_token;
6075 TOKEN_PRIMARY_GROUP group_token;
6076 unsigned euid;
6077 unsigned egid;
6078 PROCESS_MEMORY_COUNTERS mem;
6079 PROCESS_MEMORY_COUNTERS_EX mem_ex;
6080 SIZE_T minrss, maxrss;
6081 MEMORYSTATUS memst;
6082 MEMORY_STATUS_EX memstex;
6083 double totphys = 0.0;
6084 Lisp_Object ctime, stime, utime, etime, ttime;
6085 double pcpu;
6086 BOOL result = FALSE;
6087
6088 CHECK_NUMBER_OR_FLOAT (pid);
6089 proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
6090
6091 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
6092
6093 GCPRO3 (attrs, decoded_cmd, tem);
6094
6095 if (h_snapshot != INVALID_HANDLE_VALUE)
6096 {
6097 PROCESSENTRY32 pe;
6098 BOOL res;
6099
6100 pe.dwSize = sizeof (PROCESSENTRY32);
6101 for (res = process32_first (h_snapshot, &pe); res;
6102 res = process32_next (h_snapshot, &pe))
6103 {
6104 if (proc_id == pe.th32ProcessID)
6105 {
6106 if (proc_id == 0)
6107 decoded_cmd = build_string ("Idle");
6108 else
6109 {
6110 /* Decode the command name from locale-specific
6111 encoding. */
6112 cmd_str = build_unibyte_string (pe.szExeFile);
6113
6114 decoded_cmd =
6115 code_convert_string_norecord (cmd_str,
6116 Vlocale_coding_system, 0);
6117 }
6118 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
6119 attrs = Fcons (Fcons (Qppid,
6120 make_fixnum_or_float (pe.th32ParentProcessID)),
6121 attrs);
6122 attrs = Fcons (Fcons (Qpri, make_number (pe.pcPriClassBase)),
6123 attrs);
6124 attrs = Fcons (Fcons (Qthcount,
6125 make_fixnum_or_float (pe.cntThreads)),
6126 attrs);
6127 found_proc = 1;
6128 break;
6129 }
6130 }
6131
6132 CloseHandle (h_snapshot);
6133 }
6134
6135 if (!found_proc)
6136 {
6137 UNGCPRO;
6138 return Qnil;
6139 }
6140
6141 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
6142 FALSE, proc_id);
6143 /* If we were denied a handle to the process, try again after
6144 enabling the SeDebugPrivilege in our process. */
6145 if (!h_proc)
6146 {
6147 TOKEN_PRIVILEGES priv_current;
6148
6149 if (enable_privilege (SE_DEBUG_NAME, TRUE, &priv_current))
6150 {
6151 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
6152 FALSE, proc_id);
6153 restore_privilege (&priv_current);
6154 revert_to_self ();
6155 }
6156 }
6157 if (h_proc)
6158 {
6159 result = open_process_token (h_proc, TOKEN_QUERY, &token);
6160 if (result)
6161 {
6162 result = get_token_information (token, TokenUser, NULL, 0, &blen);
6163 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
6164 {
6165 buf = xmalloc (blen);
6166 result = get_token_information (token, TokenUser,
6167 (LPVOID)buf, blen, &needed);
6168 if (result)
6169 {
6170 memcpy (&user_token, buf, sizeof (user_token));
6171 if (!w32_cached_id (user_token.User.Sid, &euid, uname))
6172 {
6173 euid = get_rid (user_token.User.Sid);
6174 result = lookup_account_sid (NULL, user_token.User.Sid,
6175 uname, &ulength,
6176 domain, &dlength,
6177 &user_type);
6178 if (result)
6179 w32_add_to_cache (user_token.User.Sid, euid, uname);
6180 else
6181 {
6182 strcpy (uname, "unknown");
6183 result = TRUE;
6184 }
6185 }
6186 ulength = strlen (uname);
6187 }
6188 }
6189 }
6190 if (result)
6191 {
6192 /* Determine a reasonable euid and gid values. */
6193 if (xstrcasecmp ("administrator", uname) == 0)
6194 {
6195 euid = 500; /* well-known Administrator uid */
6196 egid = 513; /* well-known None gid */
6197 }
6198 else
6199 {
6200 /* Get group id and name. */
6201 result = get_token_information (token, TokenPrimaryGroup,
6202 (LPVOID)buf, blen, &needed);
6203 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
6204 {
6205 buf = xrealloc (buf, blen = needed);
6206 result = get_token_information (token, TokenPrimaryGroup,
6207 (LPVOID)buf, blen, &needed);
6208 }
6209 if (result)
6210 {
6211 memcpy (&group_token, buf, sizeof (group_token));
6212 if (!w32_cached_id (group_token.PrimaryGroup, &egid, gname))
6213 {
6214 egid = get_rid (group_token.PrimaryGroup);
6215 dlength = sizeof (domain);
6216 result =
6217 lookup_account_sid (NULL, group_token.PrimaryGroup,
6218 gname, &glength, NULL, &dlength,
6219 &user_type);
6220 if (result)
6221 w32_add_to_cache (group_token.PrimaryGroup,
6222 egid, gname);
6223 else
6224 {
6225 strcpy (gname, "None");
6226 result = TRUE;
6227 }
6228 }
6229 glength = strlen (gname);
6230 }
6231 }
6232 }
6233 xfree (buf);
6234 }
6235 if (!result)
6236 {
6237 if (!is_windows_9x ())
6238 {
6239 /* We couldn't open the process token, presumably because of
6240 insufficient access rights. Assume this process is run
6241 by the system. */
6242 strcpy (uname, "SYSTEM");
6243 strcpy (gname, "None");
6244 euid = 18; /* SYSTEM */
6245 egid = 513; /* None */
6246 glength = strlen (gname);
6247 ulength = strlen (uname);
6248 }
6249 /* If we are running under Windows 9X, where security calls are
6250 not supported, we assume all processes are run by the current
6251 user. */
6252 else if (GetUserName (uname, &ulength))
6253 {
6254 if (xstrcasecmp ("administrator", uname) == 0)
6255 euid = 0;
6256 else
6257 euid = 123;
6258 egid = euid;
6259 strcpy (gname, "None");
6260 glength = strlen (gname);
6261 ulength = strlen (uname);
6262 }
6263 else
6264 {
6265 euid = 123;
6266 egid = 123;
6267 strcpy (uname, "administrator");
6268 ulength = strlen (uname);
6269 strcpy (gname, "None");
6270 glength = strlen (gname);
6271 }
6272 if (token)
6273 CloseHandle (token);
6274 }
6275
6276 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (euid)), attrs);
6277 tem = make_unibyte_string (uname, ulength);
6278 attrs = Fcons (Fcons (Quser,
6279 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
6280 attrs);
6281 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (egid)), attrs);
6282 tem = make_unibyte_string (gname, glength);
6283 attrs = Fcons (Fcons (Qgroup,
6284 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
6285 attrs);
6286
6287 if (global_memory_status_ex (&memstex))
6288 #if __GNUC__ || (defined (_MSC_VER) && _MSC_VER >= 1300)
6289 totphys = memstex.ullTotalPhys / 1024.0;
6290 #else
6291 /* Visual Studio 6 cannot convert an unsigned __int64 type to
6292 double, so we need to do this for it... */
6293 {
6294 DWORD tot_hi = memstex.ullTotalPhys >> 32;
6295 DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffff) >> 10;
6296 DWORD tot_lo = memstex.ullTotalPhys % 1024;
6297
6298 totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
6299 }
6300 #endif /* __GNUC__ || _MSC_VER >= 1300 */
6301 else if (global_memory_status (&memst))
6302 totphys = memst.dwTotalPhys / 1024.0;
6303
6304 if (h_proc
6305 && get_process_memory_info (h_proc, (PROCESS_MEMORY_COUNTERS *)&mem_ex,
6306 sizeof (mem_ex)))
6307 {
6308 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
6309
6310 attrs = Fcons (Fcons (Qmajflt,
6311 make_fixnum_or_float (mem_ex.PageFaultCount)),
6312 attrs);
6313 attrs = Fcons (Fcons (Qvsize,
6314 make_fixnum_or_float (mem_ex.PrivateUsage / 1024)),
6315 attrs);
6316 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
6317 if (totphys)
6318 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6319 }
6320 else if (h_proc
6321 && get_process_memory_info (h_proc, &mem, sizeof (mem)))
6322 {
6323 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
6324
6325 attrs = Fcons (Fcons (Qmajflt,
6326 make_fixnum_or_float (mem.PageFaultCount)),
6327 attrs);
6328 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
6329 if (totphys)
6330 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6331 }
6332 else if (h_proc
6333 && get_process_working_set_size (h_proc, &minrss, &maxrss))
6334 {
6335 DWORD rss = maxrss / 1024;
6336
6337 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (maxrss / 1024)), attrs);
6338 if (totphys)
6339 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6340 }
6341
6342 if (process_times (h_proc, &ctime, &etime, &stime, &utime, &ttime, &pcpu))
6343 {
6344 attrs = Fcons (Fcons (Qutime, utime), attrs);
6345 attrs = Fcons (Fcons (Qstime, stime), attrs);
6346 attrs = Fcons (Fcons (Qtime, ttime), attrs);
6347 attrs = Fcons (Fcons (Qstart, ctime), attrs);
6348 attrs = Fcons (Fcons (Qetime, etime), attrs);
6349 attrs = Fcons (Fcons (Qpcpu, make_float (pcpu)), attrs);
6350 }
6351
6352 /* FIXME: Retrieve command line by walking the PEB of the process. */
6353
6354 if (h_proc)
6355 CloseHandle (h_proc);
6356 UNGCPRO;
6357 return attrs;
6358 }
6359
6360 \f
6361 /* Wrappers for winsock functions to map between our file descriptors
6362 and winsock's handles; also set h_errno for convenience.
6363
6364 To allow Emacs to run on systems which don't have winsock support
6365 installed, we dynamically link to winsock on startup if present, and
6366 otherwise provide the minimum necessary functionality
6367 (eg. gethostname). */
6368
6369 /* function pointers for relevant socket functions */
6370 int (PASCAL *pfn_WSAStartup) (WORD wVersionRequired, LPWSADATA lpWSAData);
6371 void (PASCAL *pfn_WSASetLastError) (int iError);
6372 int (PASCAL *pfn_WSAGetLastError) (void);
6373 int (PASCAL *pfn_WSAEventSelect) (SOCKET s, HANDLE hEventObject, long lNetworkEvents);
6374 HANDLE (PASCAL *pfn_WSACreateEvent) (void);
6375 int (PASCAL *pfn_WSACloseEvent) (HANDLE hEvent);
6376 int (PASCAL *pfn_socket) (int af, int type, int protocol);
6377 int (PASCAL *pfn_bind) (SOCKET s, const struct sockaddr *addr, int namelen);
6378 int (PASCAL *pfn_connect) (SOCKET s, const struct sockaddr *addr, int namelen);
6379 int (PASCAL *pfn_ioctlsocket) (SOCKET s, long cmd, u_long *argp);
6380 int (PASCAL *pfn_recv) (SOCKET s, char * buf, int len, int flags);
6381 int (PASCAL *pfn_send) (SOCKET s, const char * buf, int len, int flags);
6382 int (PASCAL *pfn_closesocket) (SOCKET s);
6383 int (PASCAL *pfn_shutdown) (SOCKET s, int how);
6384 int (PASCAL *pfn_WSACleanup) (void);
6385
6386 u_short (PASCAL *pfn_htons) (u_short hostshort);
6387 u_short (PASCAL *pfn_ntohs) (u_short netshort);
6388 unsigned long (PASCAL *pfn_inet_addr) (const char * cp);
6389 int (PASCAL *pfn_gethostname) (char * name, int namelen);
6390 struct hostent * (PASCAL *pfn_gethostbyname) (const char * name);
6391 struct servent * (PASCAL *pfn_getservbyname) (const char * name, const char * proto);
6392 int (PASCAL *pfn_getpeername) (SOCKET s, struct sockaddr *addr, int * namelen);
6393 int (PASCAL *pfn_setsockopt) (SOCKET s, int level, int optname,
6394 const char * optval, int optlen);
6395 int (PASCAL *pfn_listen) (SOCKET s, int backlog);
6396 int (PASCAL *pfn_getsockname) (SOCKET s, struct sockaddr * name,
6397 int * namelen);
6398 SOCKET (PASCAL *pfn_accept) (SOCKET s, struct sockaddr * addr, int * addrlen);
6399 int (PASCAL *pfn_recvfrom) (SOCKET s, char * buf, int len, int flags,
6400 struct sockaddr * from, int * fromlen);
6401 int (PASCAL *pfn_sendto) (SOCKET s, const char * buf, int len, int flags,
6402 const struct sockaddr * to, int tolen);
6403
6404 /* SetHandleInformation is only needed to make sockets non-inheritable. */
6405 BOOL (WINAPI *pfn_SetHandleInformation) (HANDLE object, DWORD mask, DWORD flags);
6406 #ifndef HANDLE_FLAG_INHERIT
6407 #define HANDLE_FLAG_INHERIT 1
6408 #endif
6409
6410 HANDLE winsock_lib;
6411 static int winsock_inuse;
6412
6413 BOOL
6414 term_winsock (void)
6415 {
6416 if (winsock_lib != NULL && winsock_inuse == 0)
6417 {
6418 release_listen_threads ();
6419 /* Not sure what would cause WSAENETDOWN, or even if it can happen
6420 after WSAStartup returns successfully, but it seems reasonable
6421 to allow unloading winsock anyway in that case. */
6422 if (pfn_WSACleanup () == 0 ||
6423 pfn_WSAGetLastError () == WSAENETDOWN)
6424 {
6425 if (FreeLibrary (winsock_lib))
6426 winsock_lib = NULL;
6427 return TRUE;
6428 }
6429 }
6430 return FALSE;
6431 }
6432
6433 BOOL
6434 init_winsock (int load_now)
6435 {
6436 WSADATA winsockData;
6437
6438 if (winsock_lib != NULL)
6439 return TRUE;
6440
6441 pfn_SetHandleInformation
6442 = (void *) GetProcAddress (GetModuleHandle ("kernel32.dll"),
6443 "SetHandleInformation");
6444
6445 winsock_lib = LoadLibrary ("Ws2_32.dll");
6446
6447 if (winsock_lib != NULL)
6448 {
6449 /* dynamically link to socket functions */
6450
6451 #define LOAD_PROC(fn) \
6452 if ((pfn_##fn = (void *) GetProcAddress (winsock_lib, #fn)) == NULL) \
6453 goto fail;
6454
6455 LOAD_PROC (WSAStartup);
6456 LOAD_PROC (WSASetLastError);
6457 LOAD_PROC (WSAGetLastError);
6458 LOAD_PROC (WSAEventSelect);
6459 LOAD_PROC (WSACreateEvent);
6460 LOAD_PROC (WSACloseEvent);
6461 LOAD_PROC (socket);
6462 LOAD_PROC (bind);
6463 LOAD_PROC (connect);
6464 LOAD_PROC (ioctlsocket);
6465 LOAD_PROC (recv);
6466 LOAD_PROC (send);
6467 LOAD_PROC (closesocket);
6468 LOAD_PROC (shutdown);
6469 LOAD_PROC (htons);
6470 LOAD_PROC (ntohs);
6471 LOAD_PROC (inet_addr);
6472 LOAD_PROC (gethostname);
6473 LOAD_PROC (gethostbyname);
6474 LOAD_PROC (getservbyname);
6475 LOAD_PROC (getpeername);
6476 LOAD_PROC (WSACleanup);
6477 LOAD_PROC (setsockopt);
6478 LOAD_PROC (listen);
6479 LOAD_PROC (getsockname);
6480 LOAD_PROC (accept);
6481 LOAD_PROC (recvfrom);
6482 LOAD_PROC (sendto);
6483 #undef LOAD_PROC
6484
6485 /* specify version 1.1 of winsock */
6486 if (pfn_WSAStartup (0x101, &winsockData) == 0)
6487 {
6488 if (winsockData.wVersion != 0x101)
6489 goto fail;
6490
6491 if (!load_now)
6492 {
6493 /* Report that winsock exists and is usable, but leave
6494 socket functions disabled. I am assuming that calling
6495 WSAStartup does not require any network interaction,
6496 and in particular does not cause or require a dial-up
6497 connection to be established. */
6498
6499 pfn_WSACleanup ();
6500 FreeLibrary (winsock_lib);
6501 winsock_lib = NULL;
6502 }
6503 winsock_inuse = 0;
6504 return TRUE;
6505 }
6506
6507 fail:
6508 FreeLibrary (winsock_lib);
6509 winsock_lib = NULL;
6510 }
6511
6512 return FALSE;
6513 }
6514
6515
6516 int h_errno = 0;
6517
6518 /* Function to map winsock error codes to errno codes for those errno
6519 code defined in errno.h (errno values not defined by errno.h are
6520 already in nt/inc/sys/socket.h). */
6521 static void
6522 set_errno (void)
6523 {
6524 int wsa_err;
6525
6526 h_errno = 0;
6527 if (winsock_lib == NULL)
6528 wsa_err = EINVAL;
6529 else
6530 wsa_err = pfn_WSAGetLastError ();
6531
6532 switch (wsa_err)
6533 {
6534 case WSAEACCES: errno = EACCES; break;
6535 case WSAEBADF: errno = EBADF; break;
6536 case WSAEFAULT: errno = EFAULT; break;
6537 case WSAEINTR: errno = EINTR; break;
6538 case WSAEINVAL: errno = EINVAL; break;
6539 case WSAEMFILE: errno = EMFILE; break;
6540 case WSAENAMETOOLONG: errno = ENAMETOOLONG; break;
6541 case WSAENOTEMPTY: errno = ENOTEMPTY; break;
6542 default: errno = wsa_err; break;
6543 }
6544 }
6545
6546 static void
6547 check_errno (void)
6548 {
6549 h_errno = 0;
6550 if (winsock_lib != NULL)
6551 pfn_WSASetLastError (0);
6552 }
6553
6554 /* Extend strerror to handle the winsock-specific error codes. */
6555 struct {
6556 int errnum;
6557 char * msg;
6558 } _wsa_errlist[] = {
6559 {WSAEINTR , "Interrupted function call"},
6560 {WSAEBADF , "Bad file descriptor"},
6561 {WSAEACCES , "Permission denied"},
6562 {WSAEFAULT , "Bad address"},
6563 {WSAEINVAL , "Invalid argument"},
6564 {WSAEMFILE , "Too many open files"},
6565
6566 {WSAEWOULDBLOCK , "Resource temporarily unavailable"},
6567 {WSAEINPROGRESS , "Operation now in progress"},
6568 {WSAEALREADY , "Operation already in progress"},
6569 {WSAENOTSOCK , "Socket operation on non-socket"},
6570 {WSAEDESTADDRREQ , "Destination address required"},
6571 {WSAEMSGSIZE , "Message too long"},
6572 {WSAEPROTOTYPE , "Protocol wrong type for socket"},
6573 {WSAENOPROTOOPT , "Bad protocol option"},
6574 {WSAEPROTONOSUPPORT , "Protocol not supported"},
6575 {WSAESOCKTNOSUPPORT , "Socket type not supported"},
6576 {WSAEOPNOTSUPP , "Operation not supported"},
6577 {WSAEPFNOSUPPORT , "Protocol family not supported"},
6578 {WSAEAFNOSUPPORT , "Address family not supported by protocol family"},
6579 {WSAEADDRINUSE , "Address already in use"},
6580 {WSAEADDRNOTAVAIL , "Cannot assign requested address"},
6581 {WSAENETDOWN , "Network is down"},
6582 {WSAENETUNREACH , "Network is unreachable"},
6583 {WSAENETRESET , "Network dropped connection on reset"},
6584 {WSAECONNABORTED , "Software caused connection abort"},
6585 {WSAECONNRESET , "Connection reset by peer"},
6586 {WSAENOBUFS , "No buffer space available"},
6587 {WSAEISCONN , "Socket is already connected"},
6588 {WSAENOTCONN , "Socket is not connected"},
6589 {WSAESHUTDOWN , "Cannot send after socket shutdown"},
6590 {WSAETOOMANYREFS , "Too many references"}, /* not sure */
6591 {WSAETIMEDOUT , "Connection timed out"},
6592 {WSAECONNREFUSED , "Connection refused"},
6593 {WSAELOOP , "Network loop"}, /* not sure */
6594 {WSAENAMETOOLONG , "Name is too long"},
6595 {WSAEHOSTDOWN , "Host is down"},
6596 {WSAEHOSTUNREACH , "No route to host"},
6597 {WSAENOTEMPTY , "Buffer not empty"}, /* not sure */
6598 {WSAEPROCLIM , "Too many processes"},
6599 {WSAEUSERS , "Too many users"}, /* not sure */
6600 {WSAEDQUOT , "Double quote in host name"}, /* really not sure */
6601 {WSAESTALE , "Data is stale"}, /* not sure */
6602 {WSAEREMOTE , "Remote error"}, /* not sure */
6603
6604 {WSASYSNOTREADY , "Network subsystem is unavailable"},
6605 {WSAVERNOTSUPPORTED , "WINSOCK.DLL version out of range"},
6606 {WSANOTINITIALISED , "Winsock not initialized successfully"},
6607 {WSAEDISCON , "Graceful shutdown in progress"},
6608 #ifdef WSAENOMORE
6609 {WSAENOMORE , "No more operations allowed"}, /* not sure */
6610 {WSAECANCELLED , "Operation cancelled"}, /* not sure */
6611 {WSAEINVALIDPROCTABLE , "Invalid procedure table from service provider"},
6612 {WSAEINVALIDPROVIDER , "Invalid service provider version number"},
6613 {WSAEPROVIDERFAILEDINIT , "Unable to initialize a service provider"},
6614 {WSASYSCALLFAILURE , "System call failure"},
6615 {WSASERVICE_NOT_FOUND , "Service not found"}, /* not sure */
6616 {WSATYPE_NOT_FOUND , "Class type not found"},
6617 {WSA_E_NO_MORE , "No more resources available"}, /* really not sure */
6618 {WSA_E_CANCELLED , "Operation already cancelled"}, /* really not sure */
6619 {WSAEREFUSED , "Operation refused"}, /* not sure */
6620 #endif
6621
6622 {WSAHOST_NOT_FOUND , "Host not found"},
6623 {WSATRY_AGAIN , "Authoritative host not found during name lookup"},
6624 {WSANO_RECOVERY , "Non-recoverable error during name lookup"},
6625 {WSANO_DATA , "Valid name, no data record of requested type"},
6626
6627 {-1, NULL}
6628 };
6629
6630 char *
6631 sys_strerror (int error_no)
6632 {
6633 int i;
6634 static char unknown_msg[40];
6635
6636 if (error_no >= 0 && error_no < sys_nerr)
6637 return sys_errlist[error_no];
6638
6639 for (i = 0; _wsa_errlist[i].errnum >= 0; i++)
6640 if (_wsa_errlist[i].errnum == error_no)
6641 return _wsa_errlist[i].msg;
6642
6643 sprintf (unknown_msg, "Unidentified error: %d", error_no);
6644 return unknown_msg;
6645 }
6646
6647 /* [andrewi 3-May-96] I've had conflicting results using both methods,
6648 but I believe the method of keeping the socket handle separate (and
6649 insuring it is not inheritable) is the correct one. */
6650
6651 #define SOCK_HANDLE(fd) ((SOCKET) fd_info[fd].hnd)
6652
6653 static int socket_to_fd (SOCKET s);
6654
6655 int
6656 sys_socket (int af, int type, int protocol)
6657 {
6658 SOCKET s;
6659
6660 if (winsock_lib == NULL)
6661 {
6662 errno = ENETDOWN;
6663 return INVALID_SOCKET;
6664 }
6665
6666 check_errno ();
6667
6668 /* call the real socket function */
6669 s = pfn_socket (af, type, protocol);
6670
6671 if (s != INVALID_SOCKET)
6672 return socket_to_fd (s);
6673
6674 set_errno ();
6675 return -1;
6676 }
6677
6678 /* Convert a SOCKET to a file descriptor. */
6679 static int
6680 socket_to_fd (SOCKET s)
6681 {
6682 int fd;
6683 child_process * cp;
6684
6685 /* Although under NT 3.5 _open_osfhandle will accept a socket
6686 handle, if opened with SO_OPENTYPE == SO_SYNCHRONOUS_NONALERT,
6687 that does not work under NT 3.1. However, we can get the same
6688 effect by using a backdoor function to replace an existing
6689 descriptor handle with the one we want. */
6690
6691 /* allocate a file descriptor (with appropriate flags) */
6692 fd = _open ("NUL:", _O_RDWR);
6693 if (fd >= 0)
6694 {
6695 /* Make a non-inheritable copy of the socket handle. Note
6696 that it is possible that sockets aren't actually kernel
6697 handles, which appears to be the case on Windows 9x when
6698 the MS Proxy winsock client is installed. */
6699 {
6700 /* Apparently there is a bug in NT 3.51 with some service
6701 packs, which prevents using DuplicateHandle to make a
6702 socket handle non-inheritable (causes WSACleanup to
6703 hang). The work-around is to use SetHandleInformation
6704 instead if it is available and implemented. */
6705 if (pfn_SetHandleInformation)
6706 {
6707 pfn_SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
6708 }
6709 else
6710 {
6711 HANDLE parent = GetCurrentProcess ();
6712 HANDLE new_s = INVALID_HANDLE_VALUE;
6713
6714 if (DuplicateHandle (parent,
6715 (HANDLE) s,
6716 parent,
6717 &new_s,
6718 0,
6719 FALSE,
6720 DUPLICATE_SAME_ACCESS))
6721 {
6722 /* It is possible that DuplicateHandle succeeds even
6723 though the socket wasn't really a kernel handle,
6724 because a real handle has the same value. So
6725 test whether the new handle really is a socket. */
6726 long nonblocking = 0;
6727 if (pfn_ioctlsocket ((SOCKET) new_s, FIONBIO, &nonblocking) == 0)
6728 {
6729 pfn_closesocket (s);
6730 s = (SOCKET) new_s;
6731 }
6732 else
6733 {
6734 CloseHandle (new_s);
6735 }
6736 }
6737 }
6738 }
6739 eassert (fd < MAXDESC);
6740 fd_info[fd].hnd = (HANDLE) s;
6741
6742 /* set our own internal flags */
6743 fd_info[fd].flags = FILE_SOCKET | FILE_BINARY | FILE_READ | FILE_WRITE;
6744
6745 cp = new_child ();
6746 if (cp)
6747 {
6748 cp->fd = fd;
6749 cp->status = STATUS_READ_ACKNOWLEDGED;
6750
6751 /* attach child_process to fd_info */
6752 if (fd_info[ fd ].cp != NULL)
6753 {
6754 DebPrint (("sys_socket: fd_info[%d] apparently in use!\n", fd));
6755 emacs_abort ();
6756 }
6757
6758 fd_info[ fd ].cp = cp;
6759
6760 /* success! */
6761 winsock_inuse++; /* count open sockets */
6762 return fd;
6763 }
6764
6765 /* clean up */
6766 _close (fd);
6767 }
6768 else
6769 pfn_closesocket (s);
6770 errno = EMFILE;
6771 return -1;
6772 }
6773
6774 int
6775 sys_bind (int s, const struct sockaddr * addr, int namelen)
6776 {
6777 if (winsock_lib == NULL)
6778 {
6779 errno = ENOTSOCK;
6780 return SOCKET_ERROR;
6781 }
6782
6783 check_errno ();
6784 if (fd_info[s].flags & FILE_SOCKET)
6785 {
6786 int rc = pfn_bind (SOCK_HANDLE (s), addr, namelen);
6787 if (rc == SOCKET_ERROR)
6788 set_errno ();
6789 return rc;
6790 }
6791 errno = ENOTSOCK;
6792 return SOCKET_ERROR;
6793 }
6794
6795 int
6796 sys_connect (int s, const struct sockaddr * name, int namelen)
6797 {
6798 if (winsock_lib == NULL)
6799 {
6800 errno = ENOTSOCK;
6801 return SOCKET_ERROR;
6802 }
6803
6804 check_errno ();
6805 if (fd_info[s].flags & FILE_SOCKET)
6806 {
6807 int rc = pfn_connect (SOCK_HANDLE (s), name, namelen);
6808 if (rc == SOCKET_ERROR)
6809 set_errno ();
6810 return rc;
6811 }
6812 errno = ENOTSOCK;
6813 return SOCKET_ERROR;
6814 }
6815
6816 u_short
6817 sys_htons (u_short hostshort)
6818 {
6819 return (winsock_lib != NULL) ?
6820 pfn_htons (hostshort) : hostshort;
6821 }
6822
6823 u_short
6824 sys_ntohs (u_short netshort)
6825 {
6826 return (winsock_lib != NULL) ?
6827 pfn_ntohs (netshort) : netshort;
6828 }
6829
6830 unsigned long
6831 sys_inet_addr (const char * cp)
6832 {
6833 return (winsock_lib != NULL) ?
6834 pfn_inet_addr (cp) : INADDR_NONE;
6835 }
6836
6837 int
6838 sys_gethostname (char * name, int namelen)
6839 {
6840 if (winsock_lib != NULL)
6841 {
6842 int retval;
6843
6844 check_errno ();
6845 retval = pfn_gethostname (name, namelen);
6846 if (retval == SOCKET_ERROR)
6847 set_errno ();
6848 return retval;
6849 }
6850
6851 if (namelen > MAX_COMPUTERNAME_LENGTH)
6852 return !GetComputerName (name, (DWORD *)&namelen);
6853
6854 errno = EFAULT;
6855 return SOCKET_ERROR;
6856 }
6857
6858 struct hostent *
6859 sys_gethostbyname (const char * name)
6860 {
6861 struct hostent * host;
6862 int h_err = h_errno;
6863
6864 if (winsock_lib == NULL)
6865 {
6866 h_errno = NO_RECOVERY;
6867 errno = ENETDOWN;
6868 return NULL;
6869 }
6870
6871 check_errno ();
6872 host = pfn_gethostbyname (name);
6873 if (!host)
6874 {
6875 set_errno ();
6876 h_errno = errno;
6877 }
6878 else
6879 h_errno = h_err;
6880 return host;
6881 }
6882
6883 struct servent *
6884 sys_getservbyname (const char * name, const char * proto)
6885 {
6886 struct servent * serv;
6887
6888 if (winsock_lib == NULL)
6889 {
6890 errno = ENETDOWN;
6891 return NULL;
6892 }
6893
6894 check_errno ();
6895 serv = pfn_getservbyname (name, proto);
6896 if (!serv)
6897 set_errno ();
6898 return serv;
6899 }
6900
6901 int
6902 sys_getpeername (int s, struct sockaddr *addr, int * namelen)
6903 {
6904 if (winsock_lib == NULL)
6905 {
6906 errno = ENETDOWN;
6907 return SOCKET_ERROR;
6908 }
6909
6910 check_errno ();
6911 if (fd_info[s].flags & FILE_SOCKET)
6912 {
6913 int rc = pfn_getpeername (SOCK_HANDLE (s), addr, namelen);
6914 if (rc == SOCKET_ERROR)
6915 set_errno ();
6916 return rc;
6917 }
6918 errno = ENOTSOCK;
6919 return SOCKET_ERROR;
6920 }
6921
6922 int
6923 sys_shutdown (int s, int how)
6924 {
6925 if (winsock_lib == NULL)
6926 {
6927 errno = ENETDOWN;
6928 return SOCKET_ERROR;
6929 }
6930
6931 check_errno ();
6932 if (fd_info[s].flags & FILE_SOCKET)
6933 {
6934 int rc = pfn_shutdown (SOCK_HANDLE (s), how);
6935 if (rc == SOCKET_ERROR)
6936 set_errno ();
6937 return rc;
6938 }
6939 errno = ENOTSOCK;
6940 return SOCKET_ERROR;
6941 }
6942
6943 int
6944 sys_setsockopt (int s, int level, int optname, const void * optval, int optlen)
6945 {
6946 if (winsock_lib == NULL)
6947 {
6948 errno = ENETDOWN;
6949 return SOCKET_ERROR;
6950 }
6951
6952 check_errno ();
6953 if (fd_info[s].flags & FILE_SOCKET)
6954 {
6955 int rc = pfn_setsockopt (SOCK_HANDLE (s), level, optname,
6956 (const char *)optval, optlen);
6957 if (rc == SOCKET_ERROR)
6958 set_errno ();
6959 return rc;
6960 }
6961 errno = ENOTSOCK;
6962 return SOCKET_ERROR;
6963 }
6964
6965 int
6966 sys_listen (int s, int backlog)
6967 {
6968 if (winsock_lib == NULL)
6969 {
6970 errno = ENETDOWN;
6971 return SOCKET_ERROR;
6972 }
6973
6974 check_errno ();
6975 if (fd_info[s].flags & FILE_SOCKET)
6976 {
6977 int rc = pfn_listen (SOCK_HANDLE (s), backlog);
6978 if (rc == SOCKET_ERROR)
6979 set_errno ();
6980 else
6981 fd_info[s].flags |= FILE_LISTEN;
6982 return rc;
6983 }
6984 errno = ENOTSOCK;
6985 return SOCKET_ERROR;
6986 }
6987
6988 int
6989 sys_getsockname (int s, struct sockaddr * name, int * namelen)
6990 {
6991 if (winsock_lib == NULL)
6992 {
6993 errno = ENETDOWN;
6994 return SOCKET_ERROR;
6995 }
6996
6997 check_errno ();
6998 if (fd_info[s].flags & FILE_SOCKET)
6999 {
7000 int rc = pfn_getsockname (SOCK_HANDLE (s), name, namelen);
7001 if (rc == SOCKET_ERROR)
7002 set_errno ();
7003 return rc;
7004 }
7005 errno = ENOTSOCK;
7006 return SOCKET_ERROR;
7007 }
7008
7009 int
7010 sys_accept (int s, struct sockaddr * addr, int * addrlen)
7011 {
7012 if (winsock_lib == NULL)
7013 {
7014 errno = ENETDOWN;
7015 return -1;
7016 }
7017
7018 check_errno ();
7019 if (fd_info[s].flags & FILE_LISTEN)
7020 {
7021 SOCKET t = pfn_accept (SOCK_HANDLE (s), addr, addrlen);
7022 int fd = -1;
7023 if (t == INVALID_SOCKET)
7024 set_errno ();
7025 else
7026 fd = socket_to_fd (t);
7027
7028 if (fd >= 0)
7029 {
7030 fd_info[s].cp->status = STATUS_READ_ACKNOWLEDGED;
7031 ResetEvent (fd_info[s].cp->char_avail);
7032 }
7033 return fd;
7034 }
7035 errno = ENOTSOCK;
7036 return -1;
7037 }
7038
7039 int
7040 sys_recvfrom (int s, char * buf, int len, int flags,
7041 struct sockaddr * from, int * fromlen)
7042 {
7043 if (winsock_lib == NULL)
7044 {
7045 errno = ENETDOWN;
7046 return SOCKET_ERROR;
7047 }
7048
7049 check_errno ();
7050 if (fd_info[s].flags & FILE_SOCKET)
7051 {
7052 int rc = pfn_recvfrom (SOCK_HANDLE (s), buf, len, flags, from, fromlen);
7053 if (rc == SOCKET_ERROR)
7054 set_errno ();
7055 return rc;
7056 }
7057 errno = ENOTSOCK;
7058 return SOCKET_ERROR;
7059 }
7060
7061 int
7062 sys_sendto (int s, const char * buf, int len, int flags,
7063 const struct sockaddr * to, int tolen)
7064 {
7065 if (winsock_lib == NULL)
7066 {
7067 errno = ENETDOWN;
7068 return SOCKET_ERROR;
7069 }
7070
7071 check_errno ();
7072 if (fd_info[s].flags & FILE_SOCKET)
7073 {
7074 int rc = pfn_sendto (SOCK_HANDLE (s), buf, len, flags, to, tolen);
7075 if (rc == SOCKET_ERROR)
7076 set_errno ();
7077 return rc;
7078 }
7079 errno = ENOTSOCK;
7080 return SOCKET_ERROR;
7081 }
7082
7083 /* Windows does not have an fcntl function. Provide an implementation
7084 good enough for Emacs. */
7085 int
7086 fcntl (int s, int cmd, int options)
7087 {
7088 /* In the w32 Emacs port, fcntl (fd, F_DUPFD_CLOEXEC, fd1) is always
7089 invoked in a context where fd1 is closed and all descriptors less
7090 than fd1 are open, so sys_dup is an adequate implementation. */
7091 if (cmd == F_DUPFD_CLOEXEC)
7092 return sys_dup (s);
7093
7094 if (winsock_lib == NULL)
7095 {
7096 errno = ENETDOWN;
7097 return -1;
7098 }
7099
7100 check_errno ();
7101 if (fd_info[s].flags & FILE_SOCKET)
7102 {
7103 if (cmd == F_SETFL && options == O_NONBLOCK)
7104 {
7105 unsigned long nblock = 1;
7106 int rc = pfn_ioctlsocket (SOCK_HANDLE (s), FIONBIO, &nblock);
7107 if (rc == SOCKET_ERROR)
7108 set_errno ();
7109 /* Keep track of the fact that we set this to non-blocking. */
7110 fd_info[s].flags |= FILE_NDELAY;
7111 return rc;
7112 }
7113 else
7114 {
7115 errno = EINVAL;
7116 return SOCKET_ERROR;
7117 }
7118 }
7119 errno = ENOTSOCK;
7120 return SOCKET_ERROR;
7121 }
7122
7123
7124 /* Shadow main io functions: we need to handle pipes and sockets more
7125 intelligently, and implement non-blocking mode as well. */
7126
7127 int
7128 sys_close (int fd)
7129 {
7130 int rc;
7131
7132 if (fd < 0)
7133 {
7134 errno = EBADF;
7135 return -1;
7136 }
7137
7138 if (fd < MAXDESC && fd_info[fd].cp)
7139 {
7140 child_process * cp = fd_info[fd].cp;
7141
7142 fd_info[fd].cp = NULL;
7143
7144 if (CHILD_ACTIVE (cp))
7145 {
7146 /* if last descriptor to active child_process then cleanup */
7147 int i;
7148 for (i = 0; i < MAXDESC; i++)
7149 {
7150 if (i == fd)
7151 continue;
7152 if (fd_info[i].cp == cp)
7153 break;
7154 }
7155 if (i == MAXDESC)
7156 {
7157 if (fd_info[fd].flags & FILE_SOCKET)
7158 {
7159 if (winsock_lib == NULL) emacs_abort ();
7160
7161 pfn_shutdown (SOCK_HANDLE (fd), 2);
7162 rc = pfn_closesocket (SOCK_HANDLE (fd));
7163
7164 winsock_inuse--; /* count open sockets */
7165 }
7166 /* If the process handle is NULL, it's either a socket
7167 or serial connection, or a subprocess that was
7168 already reaped by reap_subprocess, but whose
7169 resources were not yet freed, because its output was
7170 not fully read yet by the time it was reaped. (This
7171 usually happens with async subprocesses whose output
7172 is being read by Emacs.) Otherwise, this process was
7173 not reaped yet, so we set its FD to a negative value
7174 to make sure sys_select will eventually get to
7175 calling the SIGCHLD handler for it, which will then
7176 invoke waitpid and reap_subprocess. */
7177 if (cp->procinfo.hProcess == NULL)
7178 delete_child (cp);
7179 else
7180 cp->fd = -1;
7181 }
7182 }
7183 }
7184
7185 if (fd >= 0 && fd < MAXDESC)
7186 fd_info[fd].flags = 0;
7187
7188 /* Note that sockets do not need special treatment here (at least on
7189 NT and Windows 95 using the standard tcp/ip stacks) - it appears that
7190 closesocket is equivalent to CloseHandle, which is to be expected
7191 because socket handles are fully fledged kernel handles. */
7192 rc = _close (fd);
7193
7194 return rc;
7195 }
7196
7197 int
7198 sys_dup (int fd)
7199 {
7200 int new_fd;
7201
7202 new_fd = _dup (fd);
7203 if (new_fd >= 0 && new_fd < MAXDESC)
7204 {
7205 /* duplicate our internal info as well */
7206 fd_info[new_fd] = fd_info[fd];
7207 }
7208 return new_fd;
7209 }
7210
7211 int
7212 sys_dup2 (int src, int dst)
7213 {
7214 int rc;
7215
7216 if (dst < 0 || dst >= MAXDESC)
7217 {
7218 errno = EBADF;
7219 return -1;
7220 }
7221
7222 /* make sure we close the destination first if it's a pipe or socket */
7223 if (src != dst && fd_info[dst].flags != 0)
7224 sys_close (dst);
7225
7226 rc = _dup2 (src, dst);
7227 if (rc == 0)
7228 {
7229 /* duplicate our internal info as well */
7230 fd_info[dst] = fd_info[src];
7231 }
7232 return rc;
7233 }
7234
7235 int
7236 pipe2 (int * phandles, int pipe2_flags)
7237 {
7238 int rc;
7239 unsigned flags;
7240
7241 eassert (pipe2_flags == O_CLOEXEC);
7242
7243 /* make pipe handles non-inheritable; when we spawn a child, we
7244 replace the relevant handle with an inheritable one. Also put
7245 pipes into binary mode; we will do text mode translation ourselves
7246 if required. */
7247 rc = _pipe (phandles, 0, _O_NOINHERIT | _O_BINARY);
7248
7249 if (rc == 0)
7250 {
7251 /* Protect against overflow, since Windows can open more handles than
7252 our fd_info array has room for. */
7253 if (phandles[0] >= MAXDESC || phandles[1] >= MAXDESC)
7254 {
7255 _close (phandles[0]);
7256 _close (phandles[1]);
7257 errno = EMFILE;
7258 rc = -1;
7259 }
7260 else
7261 {
7262 flags = FILE_PIPE | FILE_READ | FILE_BINARY;
7263 fd_info[phandles[0]].flags = flags;
7264
7265 flags = FILE_PIPE | FILE_WRITE | FILE_BINARY;
7266 fd_info[phandles[1]].flags = flags;
7267 }
7268 }
7269
7270 return rc;
7271 }
7272
7273 /* Function to do blocking read of one byte, needed to implement
7274 select. It is only allowed on communication ports, sockets, or
7275 pipes. */
7276 int
7277 _sys_read_ahead (int fd)
7278 {
7279 child_process * cp;
7280 int rc;
7281
7282 if (fd < 0 || fd >= MAXDESC)
7283 return STATUS_READ_ERROR;
7284
7285 cp = fd_info[fd].cp;
7286
7287 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
7288 return STATUS_READ_ERROR;
7289
7290 if ((fd_info[fd].flags & (FILE_PIPE | FILE_SERIAL | FILE_SOCKET)) == 0
7291 || (fd_info[fd].flags & FILE_READ) == 0)
7292 {
7293 DebPrint (("_sys_read_ahead: internal error: fd %d is not a pipe, serial port, or socket!\n", fd));
7294 emacs_abort ();
7295 }
7296
7297 cp->status = STATUS_READ_IN_PROGRESS;
7298
7299 if (fd_info[fd].flags & FILE_PIPE)
7300 {
7301 rc = _read (fd, &cp->chr, sizeof (char));
7302
7303 /* Give subprocess time to buffer some more output for us before
7304 reporting that input is available; we need this because Windows 95
7305 connects DOS programs to pipes by making the pipe appear to be
7306 the normal console stdout - as a result most DOS programs will
7307 write to stdout without buffering, ie. one character at a
7308 time. Even some W32 programs do this - "dir" in a command
7309 shell on NT is very slow if we don't do this. */
7310 if (rc > 0)
7311 {
7312 int wait = w32_pipe_read_delay;
7313
7314 if (wait > 0)
7315 Sleep (wait);
7316 else if (wait < 0)
7317 while (++wait <= 0)
7318 /* Yield remainder of our time slice, effectively giving a
7319 temporary priority boost to the child process. */
7320 Sleep (0);
7321 }
7322 }
7323 else if (fd_info[fd].flags & FILE_SERIAL)
7324 {
7325 HANDLE hnd = fd_info[fd].hnd;
7326 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
7327 COMMTIMEOUTS ct;
7328
7329 /* Configure timeouts for blocking read. */
7330 if (!GetCommTimeouts (hnd, &ct))
7331 {
7332 cp->status = STATUS_READ_ERROR;
7333 return STATUS_READ_ERROR;
7334 }
7335 ct.ReadIntervalTimeout = 0;
7336 ct.ReadTotalTimeoutMultiplier = 0;
7337 ct.ReadTotalTimeoutConstant = 0;
7338 if (!SetCommTimeouts (hnd, &ct))
7339 {
7340 cp->status = STATUS_READ_ERROR;
7341 return STATUS_READ_ERROR;
7342 }
7343
7344 if (!ReadFile (hnd, &cp->chr, sizeof (char), (DWORD*) &rc, ovl))
7345 {
7346 if (GetLastError () != ERROR_IO_PENDING)
7347 {
7348 cp->status = STATUS_READ_ERROR;
7349 return STATUS_READ_ERROR;
7350 }
7351 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
7352 {
7353 cp->status = STATUS_READ_ERROR;
7354 return STATUS_READ_ERROR;
7355 }
7356 }
7357 }
7358 else if (fd_info[fd].flags & FILE_SOCKET)
7359 {
7360 unsigned long nblock = 0;
7361 /* We always want this to block, so temporarily disable NDELAY. */
7362 if (fd_info[fd].flags & FILE_NDELAY)
7363 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7364
7365 rc = pfn_recv (SOCK_HANDLE (fd), &cp->chr, sizeof (char), 0);
7366
7367 if (fd_info[fd].flags & FILE_NDELAY)
7368 {
7369 nblock = 1;
7370 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7371 }
7372 }
7373
7374 if (rc == sizeof (char))
7375 cp->status = STATUS_READ_SUCCEEDED;
7376 else
7377 cp->status = STATUS_READ_FAILED;
7378
7379 return cp->status;
7380 }
7381
7382 int
7383 _sys_wait_accept (int fd)
7384 {
7385 HANDLE hEv;
7386 child_process * cp;
7387 int rc;
7388
7389 if (fd < 0 || fd >= MAXDESC)
7390 return STATUS_READ_ERROR;
7391
7392 cp = fd_info[fd].cp;
7393
7394 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
7395 return STATUS_READ_ERROR;
7396
7397 cp->status = STATUS_READ_FAILED;
7398
7399 hEv = pfn_WSACreateEvent ();
7400 rc = pfn_WSAEventSelect (SOCK_HANDLE (fd), hEv, FD_ACCEPT);
7401 if (rc != SOCKET_ERROR)
7402 {
7403 do {
7404 rc = WaitForSingleObject (hEv, 500);
7405 Sleep (5);
7406 } while (rc == WAIT_TIMEOUT
7407 && cp->status != STATUS_READ_ERROR
7408 && cp->char_avail);
7409 pfn_WSAEventSelect (SOCK_HANDLE (fd), NULL, 0);
7410 if (rc == WAIT_OBJECT_0)
7411 cp->status = STATUS_READ_SUCCEEDED;
7412 }
7413 pfn_WSACloseEvent (hEv);
7414
7415 return cp->status;
7416 }
7417
7418 int
7419 sys_read (int fd, char * buffer, unsigned int count)
7420 {
7421 int nchars;
7422 int to_read;
7423 DWORD waiting;
7424 char * orig_buffer = buffer;
7425
7426 if (fd < 0)
7427 {
7428 errno = EBADF;
7429 return -1;
7430 }
7431
7432 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
7433 {
7434 child_process *cp = fd_info[fd].cp;
7435
7436 if ((fd_info[fd].flags & FILE_READ) == 0)
7437 {
7438 errno = EBADF;
7439 return -1;
7440 }
7441
7442 nchars = 0;
7443
7444 /* re-read CR carried over from last read */
7445 if (fd_info[fd].flags & FILE_LAST_CR)
7446 {
7447 if (fd_info[fd].flags & FILE_BINARY) emacs_abort ();
7448 *buffer++ = 0x0d;
7449 count--;
7450 nchars++;
7451 fd_info[fd].flags &= ~FILE_LAST_CR;
7452 }
7453
7454 /* presence of a child_process structure means we are operating in
7455 non-blocking mode - otherwise we just call _read directly.
7456 Note that the child_process structure might be missing because
7457 reap_subprocess has been called; in this case the pipe is
7458 already broken, so calling _read on it is okay. */
7459 if (cp)
7460 {
7461 int current_status = cp->status;
7462
7463 switch (current_status)
7464 {
7465 case STATUS_READ_FAILED:
7466 case STATUS_READ_ERROR:
7467 /* report normal EOF if nothing in buffer */
7468 if (nchars <= 0)
7469 fd_info[fd].flags |= FILE_AT_EOF;
7470 return nchars;
7471
7472 case STATUS_READ_READY:
7473 case STATUS_READ_IN_PROGRESS:
7474 DebPrint (("sys_read called when read is in progress\n"));
7475 errno = EWOULDBLOCK;
7476 return -1;
7477
7478 case STATUS_READ_SUCCEEDED:
7479 /* consume read-ahead char */
7480 *buffer++ = cp->chr;
7481 count--;
7482 nchars++;
7483 cp->status = STATUS_READ_ACKNOWLEDGED;
7484 ResetEvent (cp->char_avail);
7485
7486 case STATUS_READ_ACKNOWLEDGED:
7487 break;
7488
7489 default:
7490 DebPrint (("sys_read: bad status %d\n", current_status));
7491 errno = EBADF;
7492 return -1;
7493 }
7494
7495 if (fd_info[fd].flags & FILE_PIPE)
7496 {
7497 PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
7498 to_read = min (waiting, (DWORD) count);
7499
7500 if (to_read > 0)
7501 nchars += _read (fd, buffer, to_read);
7502 }
7503 else if (fd_info[fd].flags & FILE_SERIAL)
7504 {
7505 HANDLE hnd = fd_info[fd].hnd;
7506 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
7507 int rc = 0;
7508 COMMTIMEOUTS ct;
7509
7510 if (count > 0)
7511 {
7512 /* Configure timeouts for non-blocking read. */
7513 if (!GetCommTimeouts (hnd, &ct))
7514 {
7515 errno = EIO;
7516 return -1;
7517 }
7518 ct.ReadIntervalTimeout = MAXDWORD;
7519 ct.ReadTotalTimeoutMultiplier = 0;
7520 ct.ReadTotalTimeoutConstant = 0;
7521 if (!SetCommTimeouts (hnd, &ct))
7522 {
7523 errno = EIO;
7524 return -1;
7525 }
7526
7527 if (!ResetEvent (ovl->hEvent))
7528 {
7529 errno = EIO;
7530 return -1;
7531 }
7532 if (!ReadFile (hnd, buffer, count, (DWORD*) &rc, ovl))
7533 {
7534 if (GetLastError () != ERROR_IO_PENDING)
7535 {
7536 errno = EIO;
7537 return -1;
7538 }
7539 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
7540 {
7541 errno = EIO;
7542 return -1;
7543 }
7544 }
7545 nchars += rc;
7546 }
7547 }
7548 else /* FILE_SOCKET */
7549 {
7550 if (winsock_lib == NULL) emacs_abort ();
7551
7552 /* do the equivalent of a non-blocking read */
7553 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONREAD, &waiting);
7554 if (waiting == 0 && nchars == 0)
7555 {
7556 errno = EWOULDBLOCK;
7557 return -1;
7558 }
7559
7560 if (waiting)
7561 {
7562 /* always use binary mode for sockets */
7563 int res = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
7564 if (res == SOCKET_ERROR)
7565 {
7566 DebPrint (("sys_read.recv failed with error %d on socket %ld\n",
7567 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
7568 set_errno ();
7569 return -1;
7570 }
7571 nchars += res;
7572 }
7573 }
7574 }
7575 else
7576 {
7577 int nread = _read (fd, buffer, count);
7578 if (nread >= 0)
7579 nchars += nread;
7580 else if (nchars == 0)
7581 nchars = nread;
7582 }
7583
7584 if (nchars <= 0)
7585 fd_info[fd].flags |= FILE_AT_EOF;
7586 /* Perform text mode translation if required. */
7587 else if ((fd_info[fd].flags & FILE_BINARY) == 0)
7588 {
7589 nchars = crlf_to_lf (nchars, orig_buffer);
7590 /* If buffer contains only CR, return that. To be absolutely
7591 sure we should attempt to read the next char, but in
7592 practice a CR to be followed by LF would not appear by
7593 itself in the buffer. */
7594 if (nchars > 1 && orig_buffer[nchars - 1] == 0x0d)
7595 {
7596 fd_info[fd].flags |= FILE_LAST_CR;
7597 nchars--;
7598 }
7599 }
7600 }
7601 else
7602 nchars = _read (fd, buffer, count);
7603
7604 return nchars;
7605 }
7606
7607 /* From w32xfns.c */
7608 extern HANDLE interrupt_handle;
7609
7610 /* For now, don't bother with a non-blocking mode */
7611 int
7612 sys_write (int fd, const void * buffer, unsigned int count)
7613 {
7614 int nchars;
7615
7616 if (fd < 0)
7617 {
7618 errno = EBADF;
7619 return -1;
7620 }
7621
7622 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
7623 {
7624 if ((fd_info[fd].flags & FILE_WRITE) == 0)
7625 {
7626 errno = EBADF;
7627 return -1;
7628 }
7629
7630 /* Perform text mode translation if required. */
7631 if ((fd_info[fd].flags & FILE_BINARY) == 0)
7632 {
7633 char * tmpbuf = alloca (count * 2);
7634 unsigned char * src = (void *)buffer;
7635 unsigned char * dst = tmpbuf;
7636 int nbytes = count;
7637
7638 while (1)
7639 {
7640 unsigned char *next;
7641 /* copy next line or remaining bytes */
7642 next = _memccpy (dst, src, '\n', nbytes);
7643 if (next)
7644 {
7645 /* copied one line ending with '\n' */
7646 int copied = next - dst;
7647 nbytes -= copied;
7648 src += copied;
7649 /* insert '\r' before '\n' */
7650 next[-1] = '\r';
7651 next[0] = '\n';
7652 dst = next + 1;
7653 count++;
7654 }
7655 else
7656 /* copied remaining partial line -> now finished */
7657 break;
7658 }
7659 buffer = tmpbuf;
7660 }
7661 }
7662
7663 if (fd < MAXDESC && fd_info[fd].flags & FILE_SERIAL)
7664 {
7665 HANDLE hnd = (HANDLE) _get_osfhandle (fd);
7666 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_write;
7667 HANDLE wait_hnd[2] = { interrupt_handle, ovl->hEvent };
7668 DWORD active = 0;
7669
7670 if (!WriteFile (hnd, buffer, count, (DWORD*) &nchars, ovl))
7671 {
7672 if (GetLastError () != ERROR_IO_PENDING)
7673 {
7674 errno = EIO;
7675 return -1;
7676 }
7677 if (detect_input_pending ())
7678 active = MsgWaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE,
7679 QS_ALLINPUT);
7680 else
7681 active = WaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE);
7682 if (active == WAIT_OBJECT_0)
7683 { /* User pressed C-g, cancel write, then leave. Don't bother
7684 cleaning up as we may only get stuck in buggy drivers. */
7685 PurgeComm (hnd, PURGE_TXABORT | PURGE_TXCLEAR);
7686 CancelIo (hnd);
7687 errno = EIO;
7688 return -1;
7689 }
7690 if (active == WAIT_OBJECT_0 + 1
7691 && !GetOverlappedResult (hnd, ovl, (DWORD*) &nchars, TRUE))
7692 {
7693 errno = EIO;
7694 return -1;
7695 }
7696 }
7697 }
7698 else if (fd < MAXDESC && fd_info[fd].flags & FILE_SOCKET)
7699 {
7700 unsigned long nblock = 0;
7701 if (winsock_lib == NULL) emacs_abort ();
7702
7703 /* TODO: implement select() properly so non-blocking I/O works. */
7704 /* For now, make sure the write blocks. */
7705 if (fd_info[fd].flags & FILE_NDELAY)
7706 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7707
7708 nchars = pfn_send (SOCK_HANDLE (fd), buffer, count, 0);
7709
7710 /* Set the socket back to non-blocking if it was before,
7711 for other operations that support it. */
7712 if (fd_info[fd].flags & FILE_NDELAY)
7713 {
7714 nblock = 1;
7715 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7716 }
7717
7718 if (nchars == SOCKET_ERROR)
7719 {
7720 DebPrint (("sys_write.send failed with error %d on socket %ld\n",
7721 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
7722 set_errno ();
7723 }
7724 }
7725 else
7726 {
7727 /* Some networked filesystems don't like too large writes, so
7728 break them into smaller chunks. See the Comments section of
7729 the MSDN documentation of WriteFile for details behind the
7730 choice of the value of CHUNK below. See also the thread
7731 http://thread.gmane.org/gmane.comp.version-control.git/145294
7732 in the git mailing list. */
7733 const unsigned char *p = buffer;
7734 const unsigned chunk = 30 * 1024 * 1024;
7735
7736 nchars = 0;
7737 while (count > 0)
7738 {
7739 unsigned this_chunk = count < chunk ? count : chunk;
7740 int n = _write (fd, p, this_chunk);
7741
7742 nchars += n;
7743 if (n < 0)
7744 {
7745 nchars = n;
7746 break;
7747 }
7748 else if (n < this_chunk)
7749 break;
7750 count -= n;
7751 p += n;
7752 }
7753 }
7754
7755 return nchars;
7756 }
7757
7758 \f
7759 /* Emulation of SIOCGIFCONF and getifaddrs, see process.c. */
7760
7761 extern Lisp_Object conv_sockaddr_to_lisp (struct sockaddr *, int);
7762
7763 /* Return information about network interface IFNAME, or about all
7764 interfaces (if IFNAME is nil). */
7765 static Lisp_Object
7766 network_interface_get_info (Lisp_Object ifname)
7767 {
7768 ULONG ainfo_len = sizeof (IP_ADAPTER_INFO);
7769 IP_ADAPTER_INFO *adapter, *ainfo = xmalloc (ainfo_len);
7770 DWORD retval = get_adapters_info (ainfo, &ainfo_len);
7771 Lisp_Object res = Qnil;
7772
7773 if (retval == ERROR_BUFFER_OVERFLOW)
7774 {
7775 ainfo = xrealloc (ainfo, ainfo_len);
7776 retval = get_adapters_info (ainfo, &ainfo_len);
7777 }
7778
7779 if (retval == ERROR_SUCCESS)
7780 {
7781 int eth_count = 0, tr_count = 0, fddi_count = 0, ppp_count = 0;
7782 int sl_count = 0, wlan_count = 0, lo_count = 0, ifx_count = 0;
7783 int if_num;
7784 struct sockaddr_in sa;
7785
7786 /* For the below, we need some winsock functions, so make sure
7787 the winsock DLL is loaded. If we cannot successfully load
7788 it, they will have no use of the information we provide,
7789 anyway, so punt. */
7790 if (!winsock_lib && !init_winsock (1))
7791 goto done;
7792
7793 for (adapter = ainfo; adapter; adapter = adapter->Next)
7794 {
7795 char namebuf[MAX_ADAPTER_NAME_LENGTH + 4];
7796 u_long ip_addr;
7797 /* Present Unix-compatible interface names, instead of the
7798 Windows names, which are really GUIDs not readable by
7799 humans. */
7800 static const char *ifmt[] = {
7801 "eth%d", "tr%d", "fddi%d", "ppp%d", "sl%d", "wlan%d",
7802 "lo", "ifx%d"
7803 };
7804 enum {
7805 NONE = -1,
7806 ETHERNET = 0,
7807 TOKENRING = 1,
7808 FDDI = 2,
7809 PPP = 3,
7810 SLIP = 4,
7811 WLAN = 5,
7812 LOOPBACK = 6,
7813 OTHER_IF = 7
7814 } ifmt_idx;
7815
7816 switch (adapter->Type)
7817 {
7818 case MIB_IF_TYPE_ETHERNET:
7819 /* Windows before Vista reports wireless adapters as
7820 Ethernet. Work around by looking at the Description
7821 string. */
7822 if (strstr (adapter->Description, "Wireless "))
7823 {
7824 ifmt_idx = WLAN;
7825 if_num = wlan_count++;
7826 }
7827 else
7828 {
7829 ifmt_idx = ETHERNET;
7830 if_num = eth_count++;
7831 }
7832 break;
7833 case MIB_IF_TYPE_TOKENRING:
7834 ifmt_idx = TOKENRING;
7835 if_num = tr_count++;
7836 break;
7837 case MIB_IF_TYPE_FDDI:
7838 ifmt_idx = FDDI;
7839 if_num = fddi_count++;
7840 break;
7841 case MIB_IF_TYPE_PPP:
7842 ifmt_idx = PPP;
7843 if_num = ppp_count++;
7844 break;
7845 case MIB_IF_TYPE_SLIP:
7846 ifmt_idx = SLIP;
7847 if_num = sl_count++;
7848 break;
7849 case IF_TYPE_IEEE80211:
7850 ifmt_idx = WLAN;
7851 if_num = wlan_count++;
7852 break;
7853 case MIB_IF_TYPE_LOOPBACK:
7854 if (lo_count < 0)
7855 {
7856 ifmt_idx = LOOPBACK;
7857 if_num = lo_count++;
7858 }
7859 else
7860 ifmt_idx = NONE;
7861 break;
7862 default:
7863 ifmt_idx = OTHER_IF;
7864 if_num = ifx_count++;
7865 break;
7866 }
7867 if (ifmt_idx == NONE)
7868 continue;
7869 sprintf (namebuf, ifmt[ifmt_idx], if_num);
7870
7871 sa.sin_family = AF_INET;
7872 ip_addr = sys_inet_addr (adapter->IpAddressList.IpAddress.String);
7873 if (ip_addr == INADDR_NONE)
7874 {
7875 /* Bogus address, skip this interface. */
7876 continue;
7877 }
7878 sa.sin_addr.s_addr = ip_addr;
7879 sa.sin_port = 0;
7880 if (NILP (ifname))
7881 res = Fcons (Fcons (build_string (namebuf),
7882 conv_sockaddr_to_lisp ((struct sockaddr*) &sa,
7883 sizeof (struct sockaddr))),
7884 res);
7885 else if (strcmp (namebuf, SSDATA (ifname)) == 0)
7886 {
7887 Lisp_Object hwaddr = Fmake_vector (make_number (6), Qnil);
7888 register struct Lisp_Vector *p = XVECTOR (hwaddr);
7889 Lisp_Object flags = Qnil;
7890 int n;
7891 u_long net_mask;
7892
7893 /* Flags. We guess most of them by type, since the
7894 Windows flags are different and hard to get by. */
7895 flags = Fcons (intern ("up"), flags);
7896 if (ifmt_idx == ETHERNET || ifmt_idx == WLAN)
7897 {
7898 flags = Fcons (intern ("broadcast"), flags);
7899 flags = Fcons (intern ("multicast"), flags);
7900 }
7901 flags = Fcons (intern ("running"), flags);
7902 if (ifmt_idx == PPP)
7903 {
7904 flags = Fcons (intern ("pointopoint"), flags);
7905 flags = Fcons (intern ("noarp"), flags);
7906 }
7907 if (adapter->HaveWins)
7908 flags = Fcons (intern ("WINS"), flags);
7909 if (adapter->DhcpEnabled)
7910 flags = Fcons (intern ("dynamic"), flags);
7911
7912 res = Fcons (flags, res);
7913
7914 /* Hardware address and its family. */
7915 for (n = 0; n < adapter->AddressLength; n++)
7916 p->u.contents[n] = make_number ((int) adapter->Address[n]);
7917 /* Windows does not support AF_LINK or AF_PACKET family
7918 of addresses. Use an arbitrary family number that is
7919 identical to what GNU/Linux returns. */
7920 res = Fcons (Fcons (make_number (1), hwaddr), res);
7921
7922 /* Network mask. */
7923 sa.sin_family = AF_INET;
7924 net_mask = sys_inet_addr (adapter->IpAddressList.IpMask.String);
7925 if (net_mask != INADDR_NONE)
7926 {
7927 sa.sin_addr.s_addr = net_mask;
7928 sa.sin_port = 0;
7929 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7930 sizeof (struct sockaddr)),
7931 res);
7932 }
7933 else
7934 res = Fcons (Qnil, res);
7935
7936 sa.sin_family = AF_INET;
7937 if (ip_addr != INADDR_NONE)
7938 {
7939 /* Broadcast address is only reported by
7940 GetAdaptersAddresses, which is of limited
7941 availability. Generate it on our own. */
7942 u_long bcast_addr = (ip_addr & net_mask) | ~net_mask;
7943
7944 sa.sin_addr.s_addr = bcast_addr;
7945 sa.sin_port = 0;
7946 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7947 sizeof (struct sockaddr)),
7948 res);
7949
7950 /* IP address. */
7951 sa.sin_addr.s_addr = ip_addr;
7952 sa.sin_port = 0;
7953 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7954 sizeof (struct sockaddr)),
7955 res);
7956 }
7957 else
7958 res = Fcons (Qnil, Fcons (Qnil, res));
7959 }
7960 }
7961 /* GetAdaptersInfo is documented to not report loopback
7962 interfaces, so we generate one out of thin air. */
7963 if (!lo_count)
7964 {
7965 sa.sin_family = AF_INET;
7966 sa.sin_port = 0;
7967 if (NILP (ifname))
7968 {
7969 sa.sin_addr.s_addr = sys_inet_addr ("127.0.0.1");
7970 res = Fcons (Fcons (build_string ("lo"),
7971 conv_sockaddr_to_lisp ((struct sockaddr*) &sa,
7972 sizeof (struct sockaddr))),
7973 res);
7974 }
7975 else if (strcmp (SSDATA (ifname), "lo") == 0)
7976 {
7977 res = Fcons (Fcons (intern ("running"),
7978 Fcons (intern ("loopback"),
7979 Fcons (intern ("up"), Qnil))), Qnil);
7980 /* 772 is what 3 different GNU/Linux systems report for
7981 the loopback interface. */
7982 res = Fcons (Fcons (make_number (772),
7983 Fmake_vector (make_number (6),
7984 make_number (0))),
7985 res);
7986 sa.sin_addr.s_addr = sys_inet_addr ("255.0.0.0");
7987 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7988 sizeof (struct sockaddr)),
7989 res);
7990 sa.sin_addr.s_addr = sys_inet_addr ("0.0.0.0");
7991 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7992 sizeof (struct sockaddr)),
7993 res);
7994 sa.sin_addr.s_addr = sys_inet_addr ("127.0.0.1");
7995 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7996 sizeof (struct sockaddr)),
7997 res);
7998 }
7999
8000 }
8001 }
8002
8003 done:
8004 xfree (ainfo);
8005 return res;
8006 }
8007
8008 Lisp_Object
8009 network_interface_list (void)
8010 {
8011 return network_interface_get_info (Qnil);
8012 }
8013
8014 Lisp_Object
8015 network_interface_info (Lisp_Object ifname)
8016 {
8017 return network_interface_get_info (ifname);
8018 }
8019
8020 \f
8021 /* The Windows CRT functions are "optimized for speed", so they don't
8022 check for timezone and DST changes if they were last called less
8023 than 1 minute ago (see http://support.microsoft.com/kb/821231). So
8024 all Emacs features that repeatedly call time functions (e.g.,
8025 display-time) are in real danger of missing timezone and DST
8026 changes. Calling tzset before each localtime call fixes that. */
8027 struct tm *
8028 sys_localtime (const time_t *t)
8029 {
8030 tzset ();
8031 return localtime (t);
8032 }
8033
8034
8035 \f
8036 /* Try loading LIBRARY_ID from the file(s) specified in
8037 Vdynamic_library_alist. If the library is loaded successfully,
8038 return the handle of the DLL, and record the filename in the
8039 property :loaded-from of LIBRARY_ID. If the library could not be
8040 found, or when it was already loaded (because the handle is not
8041 recorded anywhere, and so is lost after use), return NULL.
8042
8043 We could also save the handle in :loaded-from, but currently
8044 there's no use case for it. */
8045 HMODULE
8046 w32_delayed_load (Lisp_Object library_id)
8047 {
8048 HMODULE library_dll = NULL;
8049
8050 CHECK_SYMBOL (library_id);
8051
8052 if (CONSP (Vdynamic_library_alist)
8053 && NILP (Fassq (library_id, Vlibrary_cache)))
8054 {
8055 Lisp_Object found = Qnil;
8056 Lisp_Object dlls = Fassq (library_id, Vdynamic_library_alist);
8057
8058 if (CONSP (dlls))
8059 for (dlls = XCDR (dlls); CONSP (dlls); dlls = XCDR (dlls))
8060 {
8061 CHECK_STRING_CAR (dlls);
8062 if ((library_dll = LoadLibrary (SDATA (XCAR (dlls)))))
8063 {
8064 char name[MAX_PATH];
8065 DWORD len;
8066
8067 len = GetModuleFileNameA (library_dll, name, sizeof (name));
8068 found = Fcons (XCAR (dlls),
8069 (len > 0)
8070 /* Possibly truncated */
8071 ? make_specified_string (name, -1, len, 1)
8072 : Qnil);
8073 break;
8074 }
8075 }
8076
8077 Fput (library_id, QCloaded_from, found);
8078 }
8079
8080 return library_dll;
8081 }
8082
8083 \f
8084 void
8085 check_windows_init_file (void)
8086 {
8087 /* A common indication that Emacs is not installed properly is when
8088 it cannot find the Windows installation file. If this file does
8089 not exist in the expected place, tell the user. */
8090
8091 if (!noninteractive && !inhibit_window_system
8092 /* Vload_path is not yet initialized when we are loading
8093 loadup.el. */
8094 && NILP (Vpurify_flag))
8095 {
8096 Lisp_Object init_file;
8097 int fd;
8098
8099 init_file = build_string ("term/w32-win");
8100 fd = openp (Vload_path, init_file, Fget_load_suffixes (), NULL, Qnil);
8101 if (fd < 0)
8102 {
8103 Lisp_Object load_path_print = Fprin1_to_string (Vload_path, Qnil);
8104 char *init_file_name = SDATA (init_file);
8105 char *load_path = SDATA (load_path_print);
8106 char *buffer = alloca (1024
8107 + strlen (init_file_name)
8108 + strlen (load_path));
8109
8110 sprintf (buffer,
8111 "The Emacs Windows initialization file \"%s.el\" "
8112 "could not be found in your Emacs installation. "
8113 "Emacs checked the following directories for this file:\n"
8114 "\n%s\n\n"
8115 "When Emacs cannot find this file, it usually means that it "
8116 "was not installed properly, or its distribution file was "
8117 "not unpacked properly.\nSee the README.W32 file in the "
8118 "top-level Emacs directory for more information.",
8119 init_file_name, load_path);
8120 MessageBox (NULL,
8121 buffer,
8122 "Emacs Abort Dialog",
8123 MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
8124 /* Use the low-level system abort. */
8125 abort ();
8126 }
8127 else
8128 {
8129 _close (fd);
8130 }
8131 }
8132 }
8133
8134 void
8135 term_ntproc (int ignored)
8136 {
8137 (void)ignored;
8138
8139 term_timers ();
8140
8141 /* shutdown the socket interface if necessary */
8142 term_winsock ();
8143
8144 term_w32select ();
8145 }
8146
8147 void
8148 init_ntproc (int dumping)
8149 {
8150 sigset_t initial_mask = 0;
8151
8152 /* Initialize the socket interface now if available and requested by
8153 the user by defining PRELOAD_WINSOCK; otherwise loading will be
8154 delayed until open-network-stream is called (w32-has-winsock can
8155 also be used to dynamically load or reload winsock).
8156
8157 Conveniently, init_environment is called before us, so
8158 PRELOAD_WINSOCK can be set in the registry. */
8159
8160 /* Always initialize this correctly. */
8161 winsock_lib = NULL;
8162
8163 if (getenv ("PRELOAD_WINSOCK") != NULL)
8164 init_winsock (TRUE);
8165
8166 /* Initial preparation for subprocess support: replace our standard
8167 handles with non-inheritable versions. */
8168 {
8169 HANDLE parent;
8170 HANDLE stdin_save = INVALID_HANDLE_VALUE;
8171 HANDLE stdout_save = INVALID_HANDLE_VALUE;
8172 HANDLE stderr_save = INVALID_HANDLE_VALUE;
8173
8174 parent = GetCurrentProcess ();
8175
8176 /* ignore errors when duplicating and closing; typically the
8177 handles will be invalid when running as a gui program. */
8178 DuplicateHandle (parent,
8179 GetStdHandle (STD_INPUT_HANDLE),
8180 parent,
8181 &stdin_save,
8182 0,
8183 FALSE,
8184 DUPLICATE_SAME_ACCESS);
8185
8186 DuplicateHandle (parent,
8187 GetStdHandle (STD_OUTPUT_HANDLE),
8188 parent,
8189 &stdout_save,
8190 0,
8191 FALSE,
8192 DUPLICATE_SAME_ACCESS);
8193
8194 DuplicateHandle (parent,
8195 GetStdHandle (STD_ERROR_HANDLE),
8196 parent,
8197 &stderr_save,
8198 0,
8199 FALSE,
8200 DUPLICATE_SAME_ACCESS);
8201
8202 fclose (stdin);
8203 fclose (stdout);
8204 fclose (stderr);
8205
8206 if (stdin_save != INVALID_HANDLE_VALUE)
8207 _open_osfhandle ((intptr_t) stdin_save, O_TEXT);
8208 else
8209 _open ("nul", O_TEXT | O_NOINHERIT | O_RDONLY);
8210 _fdopen (0, "r");
8211
8212 if (stdout_save != INVALID_HANDLE_VALUE)
8213 _open_osfhandle ((intptr_t) stdout_save, O_TEXT);
8214 else
8215 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
8216 _fdopen (1, "w");
8217
8218 if (stderr_save != INVALID_HANDLE_VALUE)
8219 _open_osfhandle ((intptr_t) stderr_save, O_TEXT);
8220 else
8221 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
8222 _fdopen (2, "w");
8223 }
8224
8225 /* unfortunately, atexit depends on implementation of malloc */
8226 /* atexit (term_ntproc); */
8227 if (!dumping)
8228 {
8229 /* Make sure we start with all signals unblocked. */
8230 sigprocmask (SIG_SETMASK, &initial_mask, NULL);
8231 signal (SIGABRT, term_ntproc);
8232 }
8233 init_timers ();
8234
8235 /* determine which drives are fixed, for GetCachedVolumeInformation */
8236 {
8237 /* GetDriveType must have trailing backslash. */
8238 char drive[] = "A:\\";
8239
8240 /* Loop over all possible drive letters */
8241 while (*drive <= 'Z')
8242 {
8243 /* Record if this drive letter refers to a fixed drive. */
8244 fixed_drives[DRIVE_INDEX (*drive)] =
8245 (GetDriveType (drive) == DRIVE_FIXED);
8246
8247 (*drive)++;
8248 }
8249
8250 /* Reset the volume info cache. */
8251 volume_cache = NULL;
8252 }
8253 }
8254
8255 /*
8256 shutdown_handler ensures that buffers' autosave files are
8257 up to date when the user logs off, or the system shuts down.
8258 */
8259 static BOOL WINAPI
8260 shutdown_handler (DWORD type)
8261 {
8262 /* Ctrl-C and Ctrl-Break are already suppressed, so don't handle them. */
8263 if (type == CTRL_CLOSE_EVENT /* User closes console window. */
8264 || type == CTRL_LOGOFF_EVENT /* User logs off. */
8265 || type == CTRL_SHUTDOWN_EVENT) /* User shutsdown. */
8266 {
8267 /* Shut down cleanly, making sure autosave files are up to date. */
8268 shut_down_emacs (0, Qnil);
8269 }
8270
8271 /* Allow other handlers to handle this signal. */
8272 return FALSE;
8273 }
8274
8275 /*
8276 globals_of_w32 is used to initialize those global variables that
8277 must always be initialized on startup even when the global variable
8278 initialized is non zero (see the function main in emacs.c).
8279 */
8280 void
8281 globals_of_w32 (void)
8282 {
8283 HMODULE kernel32 = GetModuleHandle ("kernel32.dll");
8284
8285 get_process_times_fn = (GetProcessTimes_Proc)
8286 GetProcAddress (kernel32, "GetProcessTimes");
8287
8288 DEFSYM (QCloaded_from, ":loaded-from");
8289
8290 g_b_init_is_windows_9x = 0;
8291 g_b_init_open_process_token = 0;
8292 g_b_init_get_token_information = 0;
8293 g_b_init_lookup_account_sid = 0;
8294 g_b_init_get_sid_sub_authority = 0;
8295 g_b_init_get_sid_sub_authority_count = 0;
8296 g_b_init_get_security_info = 0;
8297 g_b_init_get_file_security = 0;
8298 g_b_init_get_security_descriptor_owner = 0;
8299 g_b_init_get_security_descriptor_group = 0;
8300 g_b_init_is_valid_sid = 0;
8301 g_b_init_create_toolhelp32_snapshot = 0;
8302 g_b_init_process32_first = 0;
8303 g_b_init_process32_next = 0;
8304 g_b_init_open_thread_token = 0;
8305 g_b_init_impersonate_self = 0;
8306 g_b_init_revert_to_self = 0;
8307 g_b_init_get_process_memory_info = 0;
8308 g_b_init_get_process_working_set_size = 0;
8309 g_b_init_global_memory_status = 0;
8310 g_b_init_global_memory_status_ex = 0;
8311 g_b_init_equal_sid = 0;
8312 g_b_init_copy_sid = 0;
8313 g_b_init_get_length_sid = 0;
8314 g_b_init_get_native_system_info = 0;
8315 g_b_init_get_system_times = 0;
8316 g_b_init_create_symbolic_link = 0;
8317 g_b_init_get_security_descriptor_dacl = 0;
8318 g_b_init_convert_sd_to_sddl = 0;
8319 g_b_init_convert_sddl_to_sd = 0;
8320 g_b_init_is_valid_security_descriptor = 0;
8321 g_b_init_set_file_security = 0;
8322 g_b_init_get_adapters_info = 0;
8323 num_of_processors = 0;
8324 /* The following sets a handler for shutdown notifications for
8325 console apps. This actually applies to Emacs in both console and
8326 GUI modes, since we had to fool windows into thinking emacs is a
8327 console application to get console mode to work. */
8328 SetConsoleCtrlHandler (shutdown_handler, TRUE);
8329
8330 /* "None" is the default group name on standalone workstations. */
8331 strcpy (dflt_group_name, "None");
8332
8333 /* Reset, in case it has some value inherited from dump time. */
8334 w32_stat_get_owner_group = 0;
8335
8336 /* If w32_unicode_filenames is non-zero, we will be using Unicode
8337 (a.k.a. "wide") APIs to invoke functions that accept file
8338 names. */
8339 if (is_windows_9x ())
8340 w32_unicode_filenames = 0;
8341 else
8342 w32_unicode_filenames = 1;
8343 }
8344
8345 /* For make-serial-process */
8346 int
8347 serial_open (Lisp_Object port_obj)
8348 {
8349 char *port = SSDATA (port_obj);
8350 HANDLE hnd;
8351 child_process *cp;
8352 int fd = -1;
8353
8354 hnd = CreateFile (port, GENERIC_READ | GENERIC_WRITE, 0, 0,
8355 OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
8356 if (hnd == INVALID_HANDLE_VALUE)
8357 error ("Could not open %s", port);
8358 fd = (int) _open_osfhandle ((intptr_t) hnd, 0);
8359 if (fd == -1)
8360 error ("Could not open %s", port);
8361
8362 cp = new_child ();
8363 if (!cp)
8364 error ("Could not create child process");
8365 cp->fd = fd;
8366 cp->status = STATUS_READ_ACKNOWLEDGED;
8367 fd_info[ fd ].hnd = hnd;
8368 fd_info[ fd ].flags |=
8369 FILE_READ | FILE_WRITE | FILE_BINARY | FILE_SERIAL;
8370 if (fd_info[ fd ].cp != NULL)
8371 {
8372 error ("fd_info[fd = %d] is already in use", fd);
8373 }
8374 fd_info[ fd ].cp = cp;
8375 cp->ovl_read.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
8376 if (cp->ovl_read.hEvent == NULL)
8377 error ("Could not create read event");
8378 cp->ovl_write.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
8379 if (cp->ovl_write.hEvent == NULL)
8380 error ("Could not create write event");
8381
8382 return fd;
8383 }
8384
8385 /* For serial-process-configure */
8386 void
8387 serial_configure (struct Lisp_Process *p, Lisp_Object contact)
8388 {
8389 Lisp_Object childp2 = Qnil;
8390 Lisp_Object tem = Qnil;
8391 HANDLE hnd;
8392 DCB dcb;
8393 COMMTIMEOUTS ct;
8394 char summary[4] = "???"; /* This usually becomes "8N1". */
8395
8396 if ((fd_info[ p->outfd ].flags & FILE_SERIAL) == 0)
8397 error ("Not a serial process");
8398 hnd = fd_info[ p->outfd ].hnd;
8399
8400 childp2 = Fcopy_sequence (p->childp);
8401
8402 /* Initialize timeouts for blocking read and blocking write. */
8403 if (!GetCommTimeouts (hnd, &ct))
8404 error ("GetCommTimeouts() failed");
8405 ct.ReadIntervalTimeout = 0;
8406 ct.ReadTotalTimeoutMultiplier = 0;
8407 ct.ReadTotalTimeoutConstant = 0;
8408 ct.WriteTotalTimeoutMultiplier = 0;
8409 ct.WriteTotalTimeoutConstant = 0;
8410 if (!SetCommTimeouts (hnd, &ct))
8411 error ("SetCommTimeouts() failed");
8412 /* Read port attributes and prepare default configuration. */
8413 memset (&dcb, 0, sizeof (dcb));
8414 dcb.DCBlength = sizeof (DCB);
8415 if (!GetCommState (hnd, &dcb))
8416 error ("GetCommState() failed");
8417 dcb.fBinary = TRUE;
8418 dcb.fNull = FALSE;
8419 dcb.fAbortOnError = FALSE;
8420 /* dcb.XonLim and dcb.XoffLim are set by GetCommState() */
8421 dcb.ErrorChar = 0;
8422 dcb.EofChar = 0;
8423 dcb.EvtChar = 0;
8424
8425 /* Configure speed. */
8426 if (!NILP (Fplist_member (contact, QCspeed)))
8427 tem = Fplist_get (contact, QCspeed);
8428 else
8429 tem = Fplist_get (p->childp, QCspeed);
8430 CHECK_NUMBER (tem);
8431 dcb.BaudRate = XINT (tem);
8432 childp2 = Fplist_put (childp2, QCspeed, tem);
8433
8434 /* Configure bytesize. */
8435 if (!NILP (Fplist_member (contact, QCbytesize)))
8436 tem = Fplist_get (contact, QCbytesize);
8437 else
8438 tem = Fplist_get (p->childp, QCbytesize);
8439 if (NILP (tem))
8440 tem = make_number (8);
8441 CHECK_NUMBER (tem);
8442 if (XINT (tem) != 7 && XINT (tem) != 8)
8443 error (":bytesize must be nil (8), 7, or 8");
8444 dcb.ByteSize = XINT (tem);
8445 summary[0] = XINT (tem) + '0';
8446 childp2 = Fplist_put (childp2, QCbytesize, tem);
8447
8448 /* Configure parity. */
8449 if (!NILP (Fplist_member (contact, QCparity)))
8450 tem = Fplist_get (contact, QCparity);
8451 else
8452 tem = Fplist_get (p->childp, QCparity);
8453 if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
8454 error (":parity must be nil (no parity), `even', or `odd'");
8455 dcb.fParity = FALSE;
8456 dcb.Parity = NOPARITY;
8457 dcb.fErrorChar = FALSE;
8458 if (NILP (tem))
8459 {
8460 summary[1] = 'N';
8461 }
8462 else if (EQ (tem, Qeven))
8463 {
8464 summary[1] = 'E';
8465 dcb.fParity = TRUE;
8466 dcb.Parity = EVENPARITY;
8467 dcb.fErrorChar = TRUE;
8468 }
8469 else if (EQ (tem, Qodd))
8470 {
8471 summary[1] = 'O';
8472 dcb.fParity = TRUE;
8473 dcb.Parity = ODDPARITY;
8474 dcb.fErrorChar = TRUE;
8475 }
8476 childp2 = Fplist_put (childp2, QCparity, tem);
8477
8478 /* Configure stopbits. */
8479 if (!NILP (Fplist_member (contact, QCstopbits)))
8480 tem = Fplist_get (contact, QCstopbits);
8481 else
8482 tem = Fplist_get (p->childp, QCstopbits);
8483 if (NILP (tem))
8484 tem = make_number (1);
8485 CHECK_NUMBER (tem);
8486 if (XINT (tem) != 1 && XINT (tem) != 2)
8487 error (":stopbits must be nil (1 stopbit), 1, or 2");
8488 summary[2] = XINT (tem) + '0';
8489 if (XINT (tem) == 1)
8490 dcb.StopBits = ONESTOPBIT;
8491 else if (XINT (tem) == 2)
8492 dcb.StopBits = TWOSTOPBITS;
8493 childp2 = Fplist_put (childp2, QCstopbits, tem);
8494
8495 /* Configure flowcontrol. */
8496 if (!NILP (Fplist_member (contact, QCflowcontrol)))
8497 tem = Fplist_get (contact, QCflowcontrol);
8498 else
8499 tem = Fplist_get (p->childp, QCflowcontrol);
8500 if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
8501 error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
8502 dcb.fOutxCtsFlow = FALSE;
8503 dcb.fOutxDsrFlow = FALSE;
8504 dcb.fDtrControl = DTR_CONTROL_DISABLE;
8505 dcb.fDsrSensitivity = FALSE;
8506 dcb.fTXContinueOnXoff = FALSE;
8507 dcb.fOutX = FALSE;
8508 dcb.fInX = FALSE;
8509 dcb.fRtsControl = RTS_CONTROL_DISABLE;
8510 dcb.XonChar = 17; /* Control-Q */
8511 dcb.XoffChar = 19; /* Control-S */
8512 if (NILP (tem))
8513 {
8514 /* Already configured. */
8515 }
8516 else if (EQ (tem, Qhw))
8517 {
8518 dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
8519 dcb.fOutxCtsFlow = TRUE;
8520 }
8521 else if (EQ (tem, Qsw))
8522 {
8523 dcb.fOutX = TRUE;
8524 dcb.fInX = TRUE;
8525 }
8526 childp2 = Fplist_put (childp2, QCflowcontrol, tem);
8527
8528 /* Activate configuration. */
8529 if (!SetCommState (hnd, &dcb))
8530 error ("SetCommState() failed");
8531
8532 childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
8533 pset_childp (p, childp2);
8534 }
8535
8536 #ifdef HAVE_GNUTLS
8537
8538 ssize_t
8539 emacs_gnutls_pull (gnutls_transport_ptr_t p, void* buf, size_t sz)
8540 {
8541 int n, err;
8542 SELECT_TYPE fdset;
8543 struct timespec timeout;
8544 struct Lisp_Process *process = (struct Lisp_Process *)p;
8545 int fd = process->infd;
8546
8547 n = sys_read (fd, (char*)buf, sz);
8548
8549 if (n >= 0)
8550 return n;
8551
8552 err = errno;
8553
8554 /* Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
8555 if (err == EWOULDBLOCK)
8556 err = EAGAIN;
8557
8558 emacs_gnutls_transport_set_errno (process->gnutls_state, err);
8559
8560 return -1;
8561 }
8562
8563 ssize_t
8564 emacs_gnutls_push (gnutls_transport_ptr_t p, const void* buf, size_t sz)
8565 {
8566 struct Lisp_Process *process = (struct Lisp_Process *)p;
8567 int fd = process->outfd;
8568 ssize_t n = sys_write (fd, buf, sz);
8569
8570 /* 0 or more bytes written means everything went fine. */
8571 if (n >= 0)
8572 return n;
8573
8574 /* Negative bytes written means we got an error in errno.
8575 Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
8576 emacs_gnutls_transport_set_errno (process->gnutls_state,
8577 errno == EWOULDBLOCK ? EAGAIN : errno);
8578
8579 return -1;
8580 }
8581 #endif /* HAVE_GNUTLS */
8582
8583 /* end of w32.c */
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