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Implement cygw32
[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, 2000-2012 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 #include <stddef.h> /* for offsetof */
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <float.h> /* for DBL_EPSILON */
26 #include <io.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <ctype.h>
30 #include <signal.h>
31 #include <sys/file.h>
32 #include <sys/time.h>
33 #include <sys/utime.h>
34 #include <math.h>
35 #include <setjmp.h>
36 #include <time.h>
37
38 /* must include CRT headers *before* config.h */
39
40 #include <config.h>
41 #include <mbstring.h> /* for _mbspbrk */
42
43 #undef access
44 #undef chdir
45 #undef chmod
46 #undef creat
47 #undef ctime
48 #undef fopen
49 #undef link
50 #undef mkdir
51 #undef mktemp
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
70 #include <pwd.h>
71 #include <grp.h>
72
73 #ifdef __GNUC__
74 #define _ANONYMOUS_UNION
75 #define _ANONYMOUS_STRUCT
76 #endif
77 #include <windows.h>
78 /* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
79 use a different name to avoid compilation problems. */
80 typedef struct _MEMORY_STATUS_EX {
81 DWORD dwLength;
82 DWORD dwMemoryLoad;
83 DWORDLONG ullTotalPhys;
84 DWORDLONG ullAvailPhys;
85 DWORDLONG ullTotalPageFile;
86 DWORDLONG ullAvailPageFile;
87 DWORDLONG ullTotalVirtual;
88 DWORDLONG ullAvailVirtual;
89 DWORDLONG ullAvailExtendedVirtual;
90 } MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
91
92 #include <lmcons.h>
93 #include <shlobj.h>
94
95 #include <tlhelp32.h>
96 #include <psapi.h>
97 #ifndef _MSC_VER
98 #include <w32api.h>
99 #endif
100 #if !defined (__MINGW32__) || __W32API_MAJOR_VERSION < 3 || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 15)
101 /* This either is not in psapi.h or guarded by higher value of
102 _WIN32_WINNT than what we use. w32api supplied with MinGW 3.15
103 defines it in psapi.h */
104 typedef struct _PROCESS_MEMORY_COUNTERS_EX {
105 DWORD cb;
106 DWORD PageFaultCount;
107 DWORD PeakWorkingSetSize;
108 DWORD WorkingSetSize;
109 DWORD QuotaPeakPagedPoolUsage;
110 DWORD QuotaPagedPoolUsage;
111 DWORD QuotaPeakNonPagedPoolUsage;
112 DWORD QuotaNonPagedPoolUsage;
113 DWORD PagefileUsage;
114 DWORD PeakPagefileUsage;
115 DWORD PrivateUsage;
116 } PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;
117 #endif
118
119 #include <winioctl.h>
120 #include <aclapi.h>
121
122 #ifdef _MSC_VER
123 /* MSVC doesn't provide the definition of REPARSE_DATA_BUFFER, except
124 on ntifs.h, which cannot be included because it triggers conflicts
125 with other Windows API headers. So we define it here by hand. */
126
127 typedef struct _REPARSE_DATA_BUFFER {
128 ULONG ReparseTag;
129 USHORT ReparseDataLength;
130 USHORT Reserved;
131 union {
132 struct {
133 USHORT SubstituteNameOffset;
134 USHORT SubstituteNameLength;
135 USHORT PrintNameOffset;
136 USHORT PrintNameLength;
137 ULONG Flags;
138 WCHAR PathBuffer[1];
139 } SymbolicLinkReparseBuffer;
140 struct {
141 USHORT SubstituteNameOffset;
142 USHORT SubstituteNameLength;
143 USHORT PrintNameOffset;
144 USHORT PrintNameLength;
145 WCHAR PathBuffer[1];
146 } MountPointReparseBuffer;
147 struct {
148 UCHAR DataBuffer[1];
149 } GenericReparseBuffer;
150 } DUMMYUNIONNAME;
151 } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
152
153 #endif
154
155 /* TCP connection support. */
156 #include <sys/socket.h>
157 #undef socket
158 #undef bind
159 #undef connect
160 #undef htons
161 #undef ntohs
162 #undef inet_addr
163 #undef gethostname
164 #undef gethostbyname
165 #undef getservbyname
166 #undef getpeername
167 #undef shutdown
168 #undef setsockopt
169 #undef listen
170 #undef getsockname
171 #undef accept
172 #undef recvfrom
173 #undef sendto
174
175 #include "w32.h"
176 #include "ndir.h"
177 #include "w32heap.h"
178 #include "systime.h"
179 #include "dispextern.h" /* for xstrcasecmp */
180 #include "coding.h" /* for Vlocale_coding_system */
181
182 #include "careadlinkat.h"
183 #include "allocator.h"
184
185 /* For serial_configure and serial_open. */
186 #include "process.h"
187
188 typedef HRESULT (WINAPI * ShGetFolderPath_fn)
189 (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);
190
191 Lisp_Object QCloaded_from;
192
193 void globals_of_w32 (void);
194 static DWORD get_rid (PSID);
195 static int is_symlink (const char *);
196 static char * chase_symlinks (const char *);
197 static int enable_privilege (LPCTSTR, BOOL, TOKEN_PRIVILEGES *);
198 static int restore_privilege (TOKEN_PRIVILEGES *);
199 static BOOL WINAPI revert_to_self (void);
200
201 \f
202 /* Initialization states.
203
204 WARNING: If you add any more such variables for additional APIs,
205 you MUST add initialization for them to globals_of_w32
206 below. This is because these variables might get set
207 to non-NULL values during dumping, but the dumped Emacs
208 cannot reuse those values, because it could be run on a
209 different version of the OS, where API addresses are
210 different. */
211 static BOOL g_b_init_is_windows_9x;
212 static BOOL g_b_init_open_process_token;
213 static BOOL g_b_init_get_token_information;
214 static BOOL g_b_init_lookup_account_sid;
215 static BOOL g_b_init_get_sid_sub_authority;
216 static BOOL g_b_init_get_sid_sub_authority_count;
217 static BOOL g_b_init_get_security_info;
218 static BOOL g_b_init_get_file_security;
219 static BOOL g_b_init_get_security_descriptor_owner;
220 static BOOL g_b_init_get_security_descriptor_group;
221 static BOOL g_b_init_is_valid_sid;
222 static BOOL g_b_init_create_toolhelp32_snapshot;
223 static BOOL g_b_init_process32_first;
224 static BOOL g_b_init_process32_next;
225 static BOOL g_b_init_open_thread_token;
226 static BOOL g_b_init_impersonate_self;
227 static BOOL g_b_init_revert_to_self;
228 static BOOL g_b_init_get_process_memory_info;
229 static BOOL g_b_init_get_process_working_set_size;
230 static BOOL g_b_init_global_memory_status;
231 static BOOL g_b_init_global_memory_status_ex;
232 static BOOL g_b_init_get_length_sid;
233 static BOOL g_b_init_equal_sid;
234 static BOOL g_b_init_copy_sid;
235 static BOOL g_b_init_get_native_system_info;
236 static BOOL g_b_init_get_system_times;
237 static BOOL g_b_init_create_symbolic_link;
238
239 /*
240 BEGIN: Wrapper functions around OpenProcessToken
241 and other functions in advapi32.dll that are only
242 supported in Windows NT / 2k / XP
243 */
244 /* ** Function pointer typedefs ** */
245 typedef BOOL (WINAPI * OpenProcessToken_Proc) (
246 HANDLE ProcessHandle,
247 DWORD DesiredAccess,
248 PHANDLE TokenHandle);
249 typedef BOOL (WINAPI * GetTokenInformation_Proc) (
250 HANDLE TokenHandle,
251 TOKEN_INFORMATION_CLASS TokenInformationClass,
252 LPVOID TokenInformation,
253 DWORD TokenInformationLength,
254 PDWORD ReturnLength);
255 typedef BOOL (WINAPI * GetProcessTimes_Proc) (
256 HANDLE process_handle,
257 LPFILETIME creation_time,
258 LPFILETIME exit_time,
259 LPFILETIME kernel_time,
260 LPFILETIME user_time);
261
262 GetProcessTimes_Proc get_process_times_fn = NULL;
263
264 #ifdef _UNICODE
265 const char * const LookupAccountSid_Name = "LookupAccountSidW";
266 const char * const GetFileSecurity_Name = "GetFileSecurityW";
267 #else
268 const char * const LookupAccountSid_Name = "LookupAccountSidA";
269 const char * const GetFileSecurity_Name = "GetFileSecurityA";
270 #endif
271 typedef BOOL (WINAPI * LookupAccountSid_Proc) (
272 LPCTSTR lpSystemName,
273 PSID Sid,
274 LPTSTR Name,
275 LPDWORD cbName,
276 LPTSTR DomainName,
277 LPDWORD cbDomainName,
278 PSID_NAME_USE peUse);
279 typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
280 PSID pSid,
281 DWORD n);
282 typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
283 PSID pSid);
284 typedef DWORD (WINAPI * GetSecurityInfo_Proc) (
285 HANDLE handle,
286 SE_OBJECT_TYPE ObjectType,
287 SECURITY_INFORMATION SecurityInfo,
288 PSID *ppsidOwner,
289 PSID *ppsidGroup,
290 PACL *ppDacl,
291 PACL *ppSacl,
292 PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
293 typedef BOOL (WINAPI * GetFileSecurity_Proc) (
294 LPCTSTR lpFileName,
295 SECURITY_INFORMATION RequestedInformation,
296 PSECURITY_DESCRIPTOR pSecurityDescriptor,
297 DWORD nLength,
298 LPDWORD lpnLengthNeeded);
299 typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
300 PSECURITY_DESCRIPTOR pSecurityDescriptor,
301 PSID *pOwner,
302 LPBOOL lpbOwnerDefaulted);
303 typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
304 PSECURITY_DESCRIPTOR pSecurityDescriptor,
305 PSID *pGroup,
306 LPBOOL lpbGroupDefaulted);
307 typedef BOOL (WINAPI * IsValidSid_Proc) (
308 PSID sid);
309 typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
310 DWORD dwFlags,
311 DWORD th32ProcessID);
312 typedef BOOL (WINAPI * Process32First_Proc) (
313 HANDLE hSnapshot,
314 LPPROCESSENTRY32 lppe);
315 typedef BOOL (WINAPI * Process32Next_Proc) (
316 HANDLE hSnapshot,
317 LPPROCESSENTRY32 lppe);
318 typedef BOOL (WINAPI * OpenThreadToken_Proc) (
319 HANDLE ThreadHandle,
320 DWORD DesiredAccess,
321 BOOL OpenAsSelf,
322 PHANDLE TokenHandle);
323 typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
324 SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
325 typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
326 typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
327 HANDLE Process,
328 PPROCESS_MEMORY_COUNTERS ppsmemCounters,
329 DWORD cb);
330 typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
331 HANDLE hProcess,
332 DWORD * lpMinimumWorkingSetSize,
333 DWORD * lpMaximumWorkingSetSize);
334 typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
335 LPMEMORYSTATUS lpBuffer);
336 typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
337 LPMEMORY_STATUS_EX lpBuffer);
338 typedef BOOL (WINAPI * CopySid_Proc) (
339 DWORD nDestinationSidLength,
340 PSID pDestinationSid,
341 PSID pSourceSid);
342 typedef BOOL (WINAPI * EqualSid_Proc) (
343 PSID pSid1,
344 PSID pSid2);
345 typedef DWORD (WINAPI * GetLengthSid_Proc) (
346 PSID pSid);
347 typedef void (WINAPI * GetNativeSystemInfo_Proc) (
348 LPSYSTEM_INFO lpSystemInfo);
349 typedef BOOL (WINAPI * GetSystemTimes_Proc) (
350 LPFILETIME lpIdleTime,
351 LPFILETIME lpKernelTime,
352 LPFILETIME lpUserTime);
353 typedef BOOLEAN (WINAPI *CreateSymbolicLink_Proc) (
354 LPTSTR lpSymlinkFileName,
355 LPTSTR lpTargetFileName,
356 DWORD dwFlags);
357
358 /* ** A utility function ** */
359 static BOOL
360 is_windows_9x (void)
361 {
362 static BOOL s_b_ret = 0;
363 OSVERSIONINFO os_ver;
364 if (g_b_init_is_windows_9x == 0)
365 {
366 g_b_init_is_windows_9x = 1;
367 ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
368 os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
369 if (GetVersionEx (&os_ver))
370 {
371 s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
372 }
373 }
374 return s_b_ret;
375 }
376
377 static Lisp_Object ltime (ULONGLONG);
378
379 /* Get total user and system times for get-internal-run-time.
380 Returns a list of integers if the times are provided by the OS
381 (NT derivatives), otherwise it returns the result of current-time. */
382 Lisp_Object
383 w32_get_internal_run_time (void)
384 {
385 if (get_process_times_fn)
386 {
387 FILETIME create, exit, kernel, user;
388 HANDLE proc = GetCurrentProcess ();
389 if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
390 {
391 LARGE_INTEGER user_int, kernel_int, total;
392 user_int.LowPart = user.dwLowDateTime;
393 user_int.HighPart = user.dwHighDateTime;
394 kernel_int.LowPart = kernel.dwLowDateTime;
395 kernel_int.HighPart = kernel.dwHighDateTime;
396 total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
397 return ltime (total.QuadPart);
398 }
399 }
400
401 return Fcurrent_time ();
402 }
403
404 /* ** The wrapper functions ** */
405
406 static BOOL WINAPI
407 open_process_token (HANDLE ProcessHandle,
408 DWORD DesiredAccess,
409 PHANDLE TokenHandle)
410 {
411 static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
412 HMODULE hm_advapi32 = NULL;
413 if (is_windows_9x () == TRUE)
414 {
415 return FALSE;
416 }
417 if (g_b_init_open_process_token == 0)
418 {
419 g_b_init_open_process_token = 1;
420 hm_advapi32 = LoadLibrary ("Advapi32.dll");
421 s_pfn_Open_Process_Token =
422 (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
423 }
424 if (s_pfn_Open_Process_Token == NULL)
425 {
426 return FALSE;
427 }
428 return (
429 s_pfn_Open_Process_Token (
430 ProcessHandle,
431 DesiredAccess,
432 TokenHandle)
433 );
434 }
435
436 static BOOL WINAPI
437 get_token_information (HANDLE TokenHandle,
438 TOKEN_INFORMATION_CLASS TokenInformationClass,
439 LPVOID TokenInformation,
440 DWORD TokenInformationLength,
441 PDWORD ReturnLength)
442 {
443 static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
444 HMODULE hm_advapi32 = NULL;
445 if (is_windows_9x () == TRUE)
446 {
447 return FALSE;
448 }
449 if (g_b_init_get_token_information == 0)
450 {
451 g_b_init_get_token_information = 1;
452 hm_advapi32 = LoadLibrary ("Advapi32.dll");
453 s_pfn_Get_Token_Information =
454 (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
455 }
456 if (s_pfn_Get_Token_Information == NULL)
457 {
458 return FALSE;
459 }
460 return (
461 s_pfn_Get_Token_Information (
462 TokenHandle,
463 TokenInformationClass,
464 TokenInformation,
465 TokenInformationLength,
466 ReturnLength)
467 );
468 }
469
470 static BOOL WINAPI
471 lookup_account_sid (LPCTSTR lpSystemName,
472 PSID Sid,
473 LPTSTR Name,
474 LPDWORD cbName,
475 LPTSTR DomainName,
476 LPDWORD cbDomainName,
477 PSID_NAME_USE peUse)
478 {
479 static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
480 HMODULE hm_advapi32 = NULL;
481 if (is_windows_9x () == TRUE)
482 {
483 return FALSE;
484 }
485 if (g_b_init_lookup_account_sid == 0)
486 {
487 g_b_init_lookup_account_sid = 1;
488 hm_advapi32 = LoadLibrary ("Advapi32.dll");
489 s_pfn_Lookup_Account_Sid =
490 (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
491 }
492 if (s_pfn_Lookup_Account_Sid == NULL)
493 {
494 return FALSE;
495 }
496 return (
497 s_pfn_Lookup_Account_Sid (
498 lpSystemName,
499 Sid,
500 Name,
501 cbName,
502 DomainName,
503 cbDomainName,
504 peUse)
505 );
506 }
507
508 static PDWORD WINAPI
509 get_sid_sub_authority (PSID pSid, DWORD n)
510 {
511 static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
512 static DWORD zero = 0U;
513 HMODULE hm_advapi32 = NULL;
514 if (is_windows_9x () == TRUE)
515 {
516 return &zero;
517 }
518 if (g_b_init_get_sid_sub_authority == 0)
519 {
520 g_b_init_get_sid_sub_authority = 1;
521 hm_advapi32 = LoadLibrary ("Advapi32.dll");
522 s_pfn_Get_Sid_Sub_Authority =
523 (GetSidSubAuthority_Proc) GetProcAddress (
524 hm_advapi32, "GetSidSubAuthority");
525 }
526 if (s_pfn_Get_Sid_Sub_Authority == NULL)
527 {
528 return &zero;
529 }
530 return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
531 }
532
533 static PUCHAR WINAPI
534 get_sid_sub_authority_count (PSID pSid)
535 {
536 static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
537 static UCHAR zero = 0U;
538 HMODULE hm_advapi32 = NULL;
539 if (is_windows_9x () == TRUE)
540 {
541 return &zero;
542 }
543 if (g_b_init_get_sid_sub_authority_count == 0)
544 {
545 g_b_init_get_sid_sub_authority_count = 1;
546 hm_advapi32 = LoadLibrary ("Advapi32.dll");
547 s_pfn_Get_Sid_Sub_Authority_Count =
548 (GetSidSubAuthorityCount_Proc) GetProcAddress (
549 hm_advapi32, "GetSidSubAuthorityCount");
550 }
551 if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
552 {
553 return &zero;
554 }
555 return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
556 }
557
558 static DWORD WINAPI
559 get_security_info (HANDLE handle,
560 SE_OBJECT_TYPE ObjectType,
561 SECURITY_INFORMATION SecurityInfo,
562 PSID *ppsidOwner,
563 PSID *ppsidGroup,
564 PACL *ppDacl,
565 PACL *ppSacl,
566 PSECURITY_DESCRIPTOR *ppSecurityDescriptor)
567 {
568 static GetSecurityInfo_Proc s_pfn_Get_Security_Info = NULL;
569 HMODULE hm_advapi32 = NULL;
570 if (is_windows_9x () == TRUE)
571 {
572 return FALSE;
573 }
574 if (g_b_init_get_security_info == 0)
575 {
576 g_b_init_get_security_info = 1;
577 hm_advapi32 = LoadLibrary ("Advapi32.dll");
578 s_pfn_Get_Security_Info =
579 (GetSecurityInfo_Proc) GetProcAddress (
580 hm_advapi32, "GetSecurityInfo");
581 }
582 if (s_pfn_Get_Security_Info == NULL)
583 {
584 return FALSE;
585 }
586 return (s_pfn_Get_Security_Info (handle, ObjectType, SecurityInfo,
587 ppsidOwner, ppsidGroup, ppDacl, ppSacl,
588 ppSecurityDescriptor));
589 }
590
591 static BOOL WINAPI
592 get_file_security (LPCTSTR lpFileName,
593 SECURITY_INFORMATION RequestedInformation,
594 PSECURITY_DESCRIPTOR pSecurityDescriptor,
595 DWORD nLength,
596 LPDWORD lpnLengthNeeded)
597 {
598 static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
599 HMODULE hm_advapi32 = NULL;
600 if (is_windows_9x () == TRUE)
601 {
602 return FALSE;
603 }
604 if (g_b_init_get_file_security == 0)
605 {
606 g_b_init_get_file_security = 1;
607 hm_advapi32 = LoadLibrary ("Advapi32.dll");
608 s_pfn_Get_File_Security =
609 (GetFileSecurity_Proc) GetProcAddress (
610 hm_advapi32, GetFileSecurity_Name);
611 }
612 if (s_pfn_Get_File_Security == NULL)
613 {
614 return FALSE;
615 }
616 return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
617 pSecurityDescriptor, nLength,
618 lpnLengthNeeded));
619 }
620
621 static BOOL WINAPI
622 get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
623 PSID *pOwner,
624 LPBOOL lpbOwnerDefaulted)
625 {
626 static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
627 HMODULE hm_advapi32 = NULL;
628 if (is_windows_9x () == TRUE)
629 {
630 return FALSE;
631 }
632 if (g_b_init_get_security_descriptor_owner == 0)
633 {
634 g_b_init_get_security_descriptor_owner = 1;
635 hm_advapi32 = LoadLibrary ("Advapi32.dll");
636 s_pfn_Get_Security_Descriptor_Owner =
637 (GetSecurityDescriptorOwner_Proc) GetProcAddress (
638 hm_advapi32, "GetSecurityDescriptorOwner");
639 }
640 if (s_pfn_Get_Security_Descriptor_Owner == NULL)
641 {
642 return FALSE;
643 }
644 return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
645 lpbOwnerDefaulted));
646 }
647
648 static BOOL WINAPI
649 get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
650 PSID *pGroup,
651 LPBOOL lpbGroupDefaulted)
652 {
653 static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
654 HMODULE hm_advapi32 = NULL;
655 if (is_windows_9x () == TRUE)
656 {
657 return FALSE;
658 }
659 if (g_b_init_get_security_descriptor_group == 0)
660 {
661 g_b_init_get_security_descriptor_group = 1;
662 hm_advapi32 = LoadLibrary ("Advapi32.dll");
663 s_pfn_Get_Security_Descriptor_Group =
664 (GetSecurityDescriptorGroup_Proc) GetProcAddress (
665 hm_advapi32, "GetSecurityDescriptorGroup");
666 }
667 if (s_pfn_Get_Security_Descriptor_Group == NULL)
668 {
669 return FALSE;
670 }
671 return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
672 lpbGroupDefaulted));
673 }
674
675 static BOOL WINAPI
676 is_valid_sid (PSID sid)
677 {
678 static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
679 HMODULE hm_advapi32 = NULL;
680 if (is_windows_9x () == TRUE)
681 {
682 return FALSE;
683 }
684 if (g_b_init_is_valid_sid == 0)
685 {
686 g_b_init_is_valid_sid = 1;
687 hm_advapi32 = LoadLibrary ("Advapi32.dll");
688 s_pfn_Is_Valid_Sid =
689 (IsValidSid_Proc) GetProcAddress (
690 hm_advapi32, "IsValidSid");
691 }
692 if (s_pfn_Is_Valid_Sid == NULL)
693 {
694 return FALSE;
695 }
696 return (s_pfn_Is_Valid_Sid (sid));
697 }
698
699 static BOOL WINAPI
700 equal_sid (PSID sid1, PSID sid2)
701 {
702 static EqualSid_Proc s_pfn_Equal_Sid = NULL;
703 HMODULE hm_advapi32 = NULL;
704 if (is_windows_9x () == TRUE)
705 {
706 return FALSE;
707 }
708 if (g_b_init_equal_sid == 0)
709 {
710 g_b_init_equal_sid = 1;
711 hm_advapi32 = LoadLibrary ("Advapi32.dll");
712 s_pfn_Equal_Sid =
713 (EqualSid_Proc) GetProcAddress (
714 hm_advapi32, "EqualSid");
715 }
716 if (s_pfn_Equal_Sid == NULL)
717 {
718 return FALSE;
719 }
720 return (s_pfn_Equal_Sid (sid1, sid2));
721 }
722
723 static DWORD WINAPI
724 get_length_sid (PSID sid)
725 {
726 static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
727 HMODULE hm_advapi32 = NULL;
728 if (is_windows_9x () == TRUE)
729 {
730 return 0;
731 }
732 if (g_b_init_get_length_sid == 0)
733 {
734 g_b_init_get_length_sid = 1;
735 hm_advapi32 = LoadLibrary ("Advapi32.dll");
736 s_pfn_Get_Length_Sid =
737 (GetLengthSid_Proc) GetProcAddress (
738 hm_advapi32, "GetLengthSid");
739 }
740 if (s_pfn_Get_Length_Sid == NULL)
741 {
742 return 0;
743 }
744 return (s_pfn_Get_Length_Sid (sid));
745 }
746
747 static BOOL WINAPI
748 copy_sid (DWORD destlen, PSID dest, PSID src)
749 {
750 static CopySid_Proc s_pfn_Copy_Sid = NULL;
751 HMODULE hm_advapi32 = NULL;
752 if (is_windows_9x () == TRUE)
753 {
754 return FALSE;
755 }
756 if (g_b_init_copy_sid == 0)
757 {
758 g_b_init_copy_sid = 1;
759 hm_advapi32 = LoadLibrary ("Advapi32.dll");
760 s_pfn_Copy_Sid =
761 (CopySid_Proc) GetProcAddress (
762 hm_advapi32, "CopySid");
763 }
764 if (s_pfn_Copy_Sid == NULL)
765 {
766 return FALSE;
767 }
768 return (s_pfn_Copy_Sid (destlen, dest, src));
769 }
770
771 /*
772 END: Wrapper functions around OpenProcessToken
773 and other functions in advapi32.dll that are only
774 supported in Windows NT / 2k / XP
775 */
776
777 static void WINAPI
778 get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
779 {
780 static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
781 if (is_windows_9x () != TRUE)
782 {
783 if (g_b_init_get_native_system_info == 0)
784 {
785 g_b_init_get_native_system_info = 1;
786 s_pfn_Get_Native_System_Info =
787 (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
788 "GetNativeSystemInfo");
789 }
790 if (s_pfn_Get_Native_System_Info != NULL)
791 s_pfn_Get_Native_System_Info (lpSystemInfo);
792 }
793 else
794 lpSystemInfo->dwNumberOfProcessors = -1;
795 }
796
797 static BOOL WINAPI
798 get_system_times (LPFILETIME lpIdleTime,
799 LPFILETIME lpKernelTime,
800 LPFILETIME lpUserTime)
801 {
802 static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
803 if (is_windows_9x () == TRUE)
804 {
805 return FALSE;
806 }
807 if (g_b_init_get_system_times == 0)
808 {
809 g_b_init_get_system_times = 1;
810 s_pfn_Get_System_times =
811 (GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
812 "GetSystemTimes");
813 }
814 if (s_pfn_Get_System_times == NULL)
815 return FALSE;
816 return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
817 }
818
819 static BOOLEAN WINAPI
820 create_symbolic_link (LPTSTR lpSymlinkFilename,
821 LPTSTR lpTargetFileName,
822 DWORD dwFlags)
823 {
824 static CreateSymbolicLink_Proc s_pfn_Create_Symbolic_Link = NULL;
825 BOOLEAN retval;
826
827 if (is_windows_9x () == TRUE)
828 {
829 errno = ENOSYS;
830 return 0;
831 }
832 if (g_b_init_create_symbolic_link == 0)
833 {
834 g_b_init_create_symbolic_link = 1;
835 #ifdef _UNICODE
836 s_pfn_Create_Symbolic_Link =
837 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
838 "CreateSymbolicLinkW");
839 #else
840 s_pfn_Create_Symbolic_Link =
841 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
842 "CreateSymbolicLinkA");
843 #endif
844 }
845 if (s_pfn_Create_Symbolic_Link == NULL)
846 {
847 errno = ENOSYS;
848 return 0;
849 }
850
851 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
852 dwFlags);
853 /* If we were denied creation of the symlink, try again after
854 enabling the SeCreateSymbolicLinkPrivilege for our process. */
855 if (!retval)
856 {
857 TOKEN_PRIVILEGES priv_current;
858
859 if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE, &priv_current))
860 {
861 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
862 dwFlags);
863 restore_privilege (&priv_current);
864 revert_to_self ();
865 }
866 }
867 return retval;
868 }
869 \f
870
871 /* Return 1 if P is a valid pointer to an object of size SIZE. Return
872 0 if P is NOT a valid pointer. Return -1 if we cannot validate P.
873
874 This is called from alloc.c:valid_pointer_p. */
875 int
876 w32_valid_pointer_p (void *p, int size)
877 {
878 SIZE_T done;
879 HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());
880
881 if (h)
882 {
883 unsigned char *buf = alloca (size);
884 int retval = ReadProcessMemory (h, p, buf, size, &done);
885
886 CloseHandle (h);
887 return retval;
888 }
889 else
890 return -1;
891 }
892
893 static char startup_dir[MAXPATHLEN];
894
895 /* Get the current working directory. */
896 char *
897 getwd (char *dir)
898 {
899 #if 0
900 if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
901 return dir;
902 return NULL;
903 #else
904 /* Emacs doesn't actually change directory itself, it stays in the
905 same directory where it was started. */
906 strcpy (dir, startup_dir);
907 return dir;
908 #endif
909 }
910
911 /* Emulate getloadavg. */
912
913 struct load_sample {
914 time_t sample_time;
915 ULONGLONG idle;
916 ULONGLONG kernel;
917 ULONGLONG user;
918 };
919
920 /* Number of processors on this machine. */
921 static unsigned num_of_processors;
922
923 /* We maintain 1-sec samples for the last 16 minutes in a circular buffer. */
924 static struct load_sample samples[16*60];
925 static int first_idx = -1, last_idx = -1;
926 static int max_idx = sizeof (samples) / sizeof (samples[0]);
927
928 static int
929 buf_next (int from)
930 {
931 int next_idx = from + 1;
932
933 if (next_idx >= max_idx)
934 next_idx = 0;
935
936 return next_idx;
937 }
938
939 static int
940 buf_prev (int from)
941 {
942 int prev_idx = from - 1;
943
944 if (prev_idx < 0)
945 prev_idx = max_idx - 1;
946
947 return prev_idx;
948 }
949
950 static void
951 sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
952 {
953 SYSTEM_INFO sysinfo;
954 FILETIME ft_idle, ft_user, ft_kernel;
955
956 /* Initialize the number of processors on this machine. */
957 if (num_of_processors <= 0)
958 {
959 get_native_system_info (&sysinfo);
960 num_of_processors = sysinfo.dwNumberOfProcessors;
961 if (num_of_processors <= 0)
962 {
963 GetSystemInfo (&sysinfo);
964 num_of_processors = sysinfo.dwNumberOfProcessors;
965 }
966 if (num_of_processors <= 0)
967 num_of_processors = 1;
968 }
969
970 /* TODO: Take into account threads that are ready to run, by
971 sampling the "\System\Processor Queue Length" performance
972 counter. The code below accounts only for threads that are
973 actually running. */
974
975 if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
976 {
977 ULARGE_INTEGER uidle, ukernel, uuser;
978
979 memcpy (&uidle, &ft_idle, sizeof (ft_idle));
980 memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
981 memcpy (&uuser, &ft_user, sizeof (ft_user));
982 *idle = uidle.QuadPart;
983 *kernel = ukernel.QuadPart;
984 *user = uuser.QuadPart;
985 }
986 else
987 {
988 *idle = 0;
989 *kernel = 0;
990 *user = 0;
991 }
992 }
993
994 /* Produce the load average for a given time interval, using the
995 samples in the samples[] array. WHICH can be 0, 1, or 2, meaning
996 1-minute, 5-minute, or 15-minute average, respectively. */
997 static double
998 getavg (int which)
999 {
1000 double retval = -1.0;
1001 double tdiff;
1002 int idx;
1003 double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
1004 time_t now = samples[last_idx].sample_time;
1005
1006 if (first_idx != last_idx)
1007 {
1008 for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
1009 {
1010 tdiff = difftime (now, samples[idx].sample_time);
1011 if (tdiff >= span - 2*DBL_EPSILON*now)
1012 {
1013 long double sys =
1014 samples[last_idx].kernel + samples[last_idx].user
1015 - (samples[idx].kernel + samples[idx].user);
1016 long double idl = samples[last_idx].idle - samples[idx].idle;
1017
1018 retval = (1.0 - idl / sys) * num_of_processors;
1019 break;
1020 }
1021 if (idx == first_idx)
1022 break;
1023 }
1024 }
1025
1026 return retval;
1027 }
1028
1029 int
1030 getloadavg (double loadavg[], int nelem)
1031 {
1032 int elem;
1033 ULONGLONG idle, kernel, user;
1034 time_t now = time (NULL);
1035
1036 /* Store another sample. We ignore samples that are less than 1 sec
1037 apart. */
1038 if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
1039 {
1040 sample_system_load (&idle, &kernel, &user);
1041 last_idx = buf_next (last_idx);
1042 samples[last_idx].sample_time = now;
1043 samples[last_idx].idle = idle;
1044 samples[last_idx].kernel = kernel;
1045 samples[last_idx].user = user;
1046 /* If the buffer has more that 15 min worth of samples, discard
1047 the old ones. */
1048 if (first_idx == -1)
1049 first_idx = last_idx;
1050 while (first_idx != last_idx
1051 && (difftime (now, samples[first_idx].sample_time)
1052 >= 15.0*60 + 2*DBL_EPSILON*now))
1053 first_idx = buf_next (first_idx);
1054 }
1055
1056 for (elem = 0; elem < nelem; elem++)
1057 {
1058 double avg = getavg (elem);
1059
1060 if (avg < 0)
1061 break;
1062 loadavg[elem] = avg;
1063 }
1064
1065 return elem;
1066 }
1067
1068 /* Emulate getpwuid, getpwnam and others. */
1069
1070 #define PASSWD_FIELD_SIZE 256
1071
1072 static char dflt_passwd_name[PASSWD_FIELD_SIZE];
1073 static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
1074 static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
1075 static char dflt_passwd_dir[PASSWD_FIELD_SIZE];
1076 static char dflt_passwd_shell[PASSWD_FIELD_SIZE];
1077
1078 static struct passwd dflt_passwd =
1079 {
1080 dflt_passwd_name,
1081 dflt_passwd_passwd,
1082 0,
1083 0,
1084 0,
1085 dflt_passwd_gecos,
1086 dflt_passwd_dir,
1087 dflt_passwd_shell,
1088 };
1089
1090 static char dflt_group_name[GNLEN+1];
1091
1092 static struct group dflt_group =
1093 {
1094 /* When group information is not available, we return this as the
1095 group for all files. */
1096 dflt_group_name,
1097 0,
1098 };
1099
1100 unsigned
1101 getuid (void)
1102 {
1103 return dflt_passwd.pw_uid;
1104 }
1105
1106 unsigned
1107 geteuid (void)
1108 {
1109 /* I could imagine arguing for checking to see whether the user is
1110 in the Administrators group and returning a UID of 0 for that
1111 case, but I don't know how wise that would be in the long run. */
1112 return getuid ();
1113 }
1114
1115 unsigned
1116 getgid (void)
1117 {
1118 return dflt_passwd.pw_gid;
1119 }
1120
1121 unsigned
1122 getegid (void)
1123 {
1124 return getgid ();
1125 }
1126
1127 struct passwd *
1128 getpwuid (unsigned uid)
1129 {
1130 if (uid == dflt_passwd.pw_uid)
1131 return &dflt_passwd;
1132 return NULL;
1133 }
1134
1135 struct group *
1136 getgrgid (gid_t gid)
1137 {
1138 return &dflt_group;
1139 }
1140
1141 struct passwd *
1142 getpwnam (char *name)
1143 {
1144 struct passwd *pw;
1145
1146 pw = getpwuid (getuid ());
1147 if (!pw)
1148 return pw;
1149
1150 if (xstrcasecmp (name, pw->pw_name))
1151 return NULL;
1152
1153 return pw;
1154 }
1155
1156 static void
1157 init_user_info (void)
1158 {
1159 /* Find the user's real name by opening the process token and
1160 looking up the name associated with the user-sid in that token.
1161
1162 Use the relative portion of the identifier authority value from
1163 the user-sid as the user id value (same for group id using the
1164 primary group sid from the process token). */
1165
1166 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
1167 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
1168 DWORD glength = sizeof (gname);
1169 HANDLE token = NULL;
1170 SID_NAME_USE user_type;
1171 unsigned char *buf = NULL;
1172 DWORD blen = 0;
1173 TOKEN_USER user_token;
1174 TOKEN_PRIMARY_GROUP group_token;
1175 BOOL result;
1176
1177 result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
1178 if (result)
1179 {
1180 result = get_token_information (token, TokenUser, NULL, 0, &blen);
1181 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1182 {
1183 buf = xmalloc (blen);
1184 result = get_token_information (token, TokenUser,
1185 (LPVOID)buf, blen, &needed);
1186 if (result)
1187 {
1188 memcpy (&user_token, buf, sizeof (user_token));
1189 result = lookup_account_sid (NULL, user_token.User.Sid,
1190 uname, &ulength,
1191 domain, &dlength, &user_type);
1192 }
1193 }
1194 else
1195 result = FALSE;
1196 }
1197 if (result)
1198 {
1199 strcpy (dflt_passwd.pw_name, uname);
1200 /* Determine a reasonable uid value. */
1201 if (xstrcasecmp ("administrator", uname) == 0)
1202 {
1203 dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
1204 dflt_passwd.pw_gid = 513; /* well-known None gid */
1205 }
1206 else
1207 {
1208 /* Use the last sub-authority value of the RID, the relative
1209 portion of the SID, as user/group ID. */
1210 dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
1211
1212 /* Get group id and name. */
1213 result = get_token_information (token, TokenPrimaryGroup,
1214 (LPVOID)buf, blen, &needed);
1215 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1216 {
1217 buf = xrealloc (buf, blen = needed);
1218 result = get_token_information (token, TokenPrimaryGroup,
1219 (LPVOID)buf, blen, &needed);
1220 }
1221 if (result)
1222 {
1223 memcpy (&group_token, buf, sizeof (group_token));
1224 dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
1225 dlength = sizeof (domain);
1226 /* If we can get at the real Primary Group name, use that.
1227 Otherwise, the default group name was already set to
1228 "None" in globals_of_w32. */
1229 if (lookup_account_sid (NULL, group_token.PrimaryGroup,
1230 gname, &glength, NULL, &dlength,
1231 &user_type))
1232 strcpy (dflt_group_name, gname);
1233 }
1234 else
1235 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1236 }
1237 }
1238 /* If security calls are not supported (presumably because we
1239 are running under Windows 9X), fallback to this: */
1240 else if (GetUserName (uname, &ulength))
1241 {
1242 strcpy (dflt_passwd.pw_name, uname);
1243 if (xstrcasecmp ("administrator", uname) == 0)
1244 dflt_passwd.pw_uid = 0;
1245 else
1246 dflt_passwd.pw_uid = 123;
1247 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1248 }
1249 else
1250 {
1251 strcpy (dflt_passwd.pw_name, "unknown");
1252 dflt_passwd.pw_uid = 123;
1253 dflt_passwd.pw_gid = 123;
1254 }
1255 dflt_group.gr_gid = dflt_passwd.pw_gid;
1256
1257 /* Ensure HOME and SHELL are defined. */
1258 if (getenv ("HOME") == NULL)
1259 abort ();
1260 if (getenv ("SHELL") == NULL)
1261 abort ();
1262
1263 /* Set dir and shell from environment variables. */
1264 strcpy (dflt_passwd.pw_dir, getenv ("HOME"));
1265 strcpy (dflt_passwd.pw_shell, getenv ("SHELL"));
1266
1267 xfree (buf);
1268 if (token)
1269 CloseHandle (token);
1270 }
1271
1272 int
1273 random (void)
1274 {
1275 /* rand () on NT gives us 15 random bits...hack together 30 bits. */
1276 return ((rand () << 15) | rand ());
1277 }
1278
1279 void
1280 srandom (int seed)
1281 {
1282 srand (seed);
1283 }
1284
1285
1286 /* Normalize filename by converting all path separators to
1287 the specified separator. Also conditionally convert upper
1288 case path name components to lower case. */
1289
1290 static void
1291 normalize_filename (register char *fp, char path_sep)
1292 {
1293 char sep;
1294 char *elem;
1295
1296 /* Always lower-case drive letters a-z, even if the filesystem
1297 preserves case in filenames.
1298 This is so filenames can be compared by string comparison
1299 functions that are case-sensitive. Even case-preserving filesystems
1300 do not distinguish case in drive letters. */
1301 if (fp[1] == ':' && *fp >= 'A' && *fp <= 'Z')
1302 {
1303 *fp += 'a' - 'A';
1304 fp += 2;
1305 }
1306
1307 if (NILP (Vw32_downcase_file_names))
1308 {
1309 while (*fp)
1310 {
1311 if (*fp == '/' || *fp == '\\')
1312 *fp = path_sep;
1313 fp++;
1314 }
1315 return;
1316 }
1317
1318 sep = path_sep; /* convert to this path separator */
1319 elem = fp; /* start of current path element */
1320
1321 do {
1322 if (*fp >= 'a' && *fp <= 'z')
1323 elem = 0; /* don't convert this element */
1324
1325 if (*fp == 0 || *fp == ':')
1326 {
1327 sep = *fp; /* restore current separator (or 0) */
1328 *fp = '/'; /* after conversion of this element */
1329 }
1330
1331 if (*fp == '/' || *fp == '\\')
1332 {
1333 if (elem && elem != fp)
1334 {
1335 *fp = 0; /* temporary end of string */
1336 _strlwr (elem); /* while we convert to lower case */
1337 }
1338 *fp = sep; /* convert (or restore) path separator */
1339 elem = fp + 1; /* next element starts after separator */
1340 sep = path_sep;
1341 }
1342 } while (*fp++);
1343 }
1344
1345 /* Destructively turn backslashes into slashes. */
1346 void
1347 dostounix_filename (register char *p)
1348 {
1349 normalize_filename (p, '/');
1350 }
1351
1352 /* Destructively turn slashes into backslashes. */
1353 void
1354 unixtodos_filename (register char *p)
1355 {
1356 normalize_filename (p, '\\');
1357 }
1358
1359 /* Remove all CR's that are followed by a LF.
1360 (From msdos.c...probably should figure out a way to share it,
1361 although this code isn't going to ever change.) */
1362 static int
1363 crlf_to_lf (register int n, register unsigned char *buf)
1364 {
1365 unsigned char *np = buf;
1366 unsigned char *startp = buf;
1367 unsigned char *endp = buf + n;
1368
1369 if (n == 0)
1370 return n;
1371 while (buf < endp - 1)
1372 {
1373 if (*buf == 0x0d)
1374 {
1375 if (*(++buf) != 0x0a)
1376 *np++ = 0x0d;
1377 }
1378 else
1379 *np++ = *buf++;
1380 }
1381 if (buf < endp)
1382 *np++ = *buf++;
1383 return np - startp;
1384 }
1385
1386 /* Parse the root part of file name, if present. Return length and
1387 optionally store pointer to char after root. */
1388 static int
1389 parse_root (char * name, char ** pPath)
1390 {
1391 char * start = name;
1392
1393 if (name == NULL)
1394 return 0;
1395
1396 /* find the root name of the volume if given */
1397 if (isalpha (name[0]) && name[1] == ':')
1398 {
1399 /* skip past drive specifier */
1400 name += 2;
1401 if (IS_DIRECTORY_SEP (name[0]))
1402 name++;
1403 }
1404 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
1405 {
1406 int slashes = 2;
1407 name += 2;
1408 do
1409 {
1410 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
1411 break;
1412 name++;
1413 }
1414 while ( *name );
1415 if (IS_DIRECTORY_SEP (name[0]))
1416 name++;
1417 }
1418
1419 if (pPath)
1420 *pPath = name;
1421
1422 return name - start;
1423 }
1424
1425 /* Get long base name for name; name is assumed to be absolute. */
1426 static int
1427 get_long_basename (char * name, char * buf, int size)
1428 {
1429 WIN32_FIND_DATA find_data;
1430 HANDLE dir_handle;
1431 int len = 0;
1432
1433 /* must be valid filename, no wild cards or other invalid characters */
1434 if (_mbspbrk (name, "*?|<>\""))
1435 return 0;
1436
1437 dir_handle = FindFirstFile (name, &find_data);
1438 if (dir_handle != INVALID_HANDLE_VALUE)
1439 {
1440 if ((len = strlen (find_data.cFileName)) < size)
1441 memcpy (buf, find_data.cFileName, len + 1);
1442 else
1443 len = 0;
1444 FindClose (dir_handle);
1445 }
1446 return len;
1447 }
1448
1449 /* Get long name for file, if possible (assumed to be absolute). */
1450 BOOL
1451 w32_get_long_filename (char * name, char * buf, int size)
1452 {
1453 char * o = buf;
1454 char * p;
1455 char * q;
1456 char full[ MAX_PATH ];
1457 int len;
1458
1459 len = strlen (name);
1460 if (len >= MAX_PATH)
1461 return FALSE;
1462
1463 /* Use local copy for destructive modification. */
1464 memcpy (full, name, len+1);
1465 unixtodos_filename (full);
1466
1467 /* Copy root part verbatim. */
1468 len = parse_root (full, &p);
1469 memcpy (o, full, len);
1470 o += len;
1471 *o = '\0';
1472 size -= len;
1473
1474 while (p != NULL && *p)
1475 {
1476 q = p;
1477 p = strchr (q, '\\');
1478 if (p) *p = '\0';
1479 len = get_long_basename (full, o, size);
1480 if (len > 0)
1481 {
1482 o += len;
1483 size -= len;
1484 if (p != NULL)
1485 {
1486 *p++ = '\\';
1487 if (size < 2)
1488 return FALSE;
1489 *o++ = '\\';
1490 size--;
1491 *o = '\0';
1492 }
1493 }
1494 else
1495 return FALSE;
1496 }
1497
1498 return TRUE;
1499 }
1500
1501 static int
1502 is_unc_volume (const char *filename)
1503 {
1504 const char *ptr = filename;
1505
1506 if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
1507 return 0;
1508
1509 if (_mbspbrk (ptr + 2, "*?|<>\"\\/"))
1510 return 0;
1511
1512 return 1;
1513 }
1514
1515 /* Routines that are no-ops on NT but are defined to get Emacs to compile. */
1516
1517 int
1518 sigsetmask (int signal_mask)
1519 {
1520 return 0;
1521 }
1522
1523 int
1524 sigmask (int sig)
1525 {
1526 return 0;
1527 }
1528
1529 int
1530 sigblock (int sig)
1531 {
1532 return 0;
1533 }
1534
1535 int
1536 sigunblock (int sig)
1537 {
1538 return 0;
1539 }
1540
1541 int
1542 sigemptyset (sigset_t *set)
1543 {
1544 return 0;
1545 }
1546
1547 int
1548 sigaddset (sigset_t *set, int signo)
1549 {
1550 return 0;
1551 }
1552
1553 int
1554 sigfillset (sigset_t *set)
1555 {
1556 return 0;
1557 }
1558
1559 int
1560 sigprocmask (int how, const sigset_t *set, sigset_t *oset)
1561 {
1562 return 0;
1563 }
1564
1565 int
1566 pthread_sigmask (int how, const sigset_t *set, sigset_t *oset)
1567 {
1568 if (sigprocmask (how, set, oset) == -1)
1569 return EINVAL;
1570 return 0;
1571 }
1572
1573 int
1574 setpgrp (int pid, int gid)
1575 {
1576 return 0;
1577 }
1578
1579 int
1580 alarm (int seconds)
1581 {
1582 return 0;
1583 }
1584
1585 #define REG_ROOT "SOFTWARE\\GNU\\Emacs"
1586
1587 LPBYTE
1588 w32_get_resource (char *key, LPDWORD lpdwtype)
1589 {
1590 LPBYTE lpvalue;
1591 HKEY hrootkey = NULL;
1592 DWORD cbData;
1593
1594 /* Check both the current user and the local machine to see if
1595 we have any resources. */
1596
1597 if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
1598 {
1599 lpvalue = NULL;
1600
1601 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
1602 && (lpvalue = xmalloc (cbData)) != NULL
1603 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
1604 {
1605 RegCloseKey (hrootkey);
1606 return (lpvalue);
1607 }
1608
1609 xfree (lpvalue);
1610
1611 RegCloseKey (hrootkey);
1612 }
1613
1614 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
1615 {
1616 lpvalue = NULL;
1617
1618 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
1619 && (lpvalue = xmalloc (cbData)) != NULL
1620 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
1621 {
1622 RegCloseKey (hrootkey);
1623 return (lpvalue);
1624 }
1625
1626 xfree (lpvalue);
1627
1628 RegCloseKey (hrootkey);
1629 }
1630
1631 return (NULL);
1632 }
1633
1634 char *get_emacs_configuration (void);
1635
1636 void
1637 init_environment (char ** argv)
1638 {
1639 static const char * const tempdirs[] = {
1640 "$TMPDIR", "$TEMP", "$TMP", "c:/"
1641 };
1642
1643 int i;
1644
1645 const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);
1646
1647 /* Make sure they have a usable $TMPDIR. Many Emacs functions use
1648 temporary files and assume "/tmp" if $TMPDIR is unset, which
1649 will break on DOS/Windows. Refuse to work if we cannot find
1650 a directory, not even "c:/", usable for that purpose. */
1651 for (i = 0; i < imax ; i++)
1652 {
1653 const char *tmp = tempdirs[i];
1654
1655 if (*tmp == '$')
1656 tmp = getenv (tmp + 1);
1657 /* Note that `access' can lie to us if the directory resides on a
1658 read-only filesystem, like CD-ROM or a write-protected floppy.
1659 The only way to be really sure is to actually create a file and
1660 see if it succeeds. But I think that's too much to ask. */
1661
1662 /* MSVCRT's _access crashes with D_OK. */
1663 if (tmp && sys_access (tmp, D_OK) == 0)
1664 {
1665 char * var = alloca (strlen (tmp) + 8);
1666 sprintf (var, "TMPDIR=%s", tmp);
1667 _putenv (strdup (var));
1668 break;
1669 }
1670 }
1671 if (i >= imax)
1672 cmd_error_internal
1673 (Fcons (Qerror,
1674 Fcons (build_string ("no usable temporary directories found!!"),
1675 Qnil)),
1676 "While setting TMPDIR: ");
1677
1678 /* Check for environment variables and use registry settings if they
1679 don't exist. Fallback on default values where applicable. */
1680 {
1681 int i;
1682 LPBYTE lpval;
1683 DWORD dwType;
1684 char locale_name[32];
1685 struct stat ignored;
1686 char default_home[MAX_PATH];
1687 int appdata = 0;
1688
1689 static const struct env_entry
1690 {
1691 char * name;
1692 char * def_value;
1693 } dflt_envvars[] =
1694 {
1695 /* If the default value is NULL, we will use the value from the
1696 outside environment or the Registry, but will not push the
1697 variable into the Emacs environment if it is defined neither
1698 in the Registry nor in the outside environment. */
1699 {"HOME", "C:/"},
1700 {"PRELOAD_WINSOCK", NULL},
1701 {"emacs_dir", "C:/emacs"},
1702 {"EMACSLOADPATH", NULL},
1703 {"SHELL", "%emacs_dir%/bin/cmdproxy.exe"},
1704 {"EMACSDATA", NULL},
1705 {"EMACSPATH", NULL},
1706 {"INFOPATH", NULL},
1707 {"EMACSDOC", NULL},
1708 {"TERM", "cmd"},
1709 {"LANG", NULL},
1710 };
1711
1712 #define N_ENV_VARS sizeof (dflt_envvars)/sizeof (dflt_envvars[0])
1713
1714 /* We need to copy dflt_envvars[] and work on the copy because we
1715 don't want the dumped Emacs to inherit the values of
1716 environment variables we saw during dumping (which could be on
1717 a different system). The defaults above must be left intact. */
1718 struct env_entry env_vars[N_ENV_VARS];
1719
1720 for (i = 0; i < N_ENV_VARS; i++)
1721 env_vars[i] = dflt_envvars[i];
1722
1723 /* For backwards compatibility, check if a .emacs file exists in C:/
1724 If not, then we can try to default to the appdata directory under the
1725 user's profile, which is more likely to be writable. */
1726 if (stat ("C:/.emacs", &ignored) < 0)
1727 {
1728 HRESULT profile_result;
1729 /* Dynamically load ShGetFolderPath, as it won't exist on versions
1730 of Windows 95 and NT4 that have not been updated to include
1731 MSIE 5. */
1732 ShGetFolderPath_fn get_folder_path;
1733 get_folder_path = (ShGetFolderPath_fn)
1734 GetProcAddress (GetModuleHandle ("shell32.dll"), "SHGetFolderPathA");
1735
1736 if (get_folder_path != NULL)
1737 {
1738 profile_result = get_folder_path (NULL, CSIDL_APPDATA, NULL,
1739 0, default_home);
1740
1741 /* If we can't get the appdata dir, revert to old behavior. */
1742 if (profile_result == S_OK)
1743 {
1744 env_vars[0].def_value = default_home;
1745 appdata = 1;
1746 }
1747 }
1748 }
1749
1750 /* Get default locale info and use it for LANG. */
1751 if (GetLocaleInfo (LOCALE_USER_DEFAULT,
1752 LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
1753 locale_name, sizeof (locale_name)))
1754 {
1755 for (i = 0; i < N_ENV_VARS; i++)
1756 {
1757 if (strcmp (env_vars[i].name, "LANG") == 0)
1758 {
1759 env_vars[i].def_value = locale_name;
1760 break;
1761 }
1762 }
1763 }
1764
1765 #define SET_ENV_BUF_SIZE (4 * MAX_PATH) /* to cover EMACSLOADPATH */
1766
1767 /* Treat emacs_dir specially: set it unconditionally based on our
1768 location. */
1769 {
1770 char *p;
1771 char modname[MAX_PATH];
1772
1773 if (!GetModuleFileName (NULL, modname, MAX_PATH))
1774 abort ();
1775 if ((p = strrchr (modname, '\\')) == NULL)
1776 abort ();
1777 *p = 0;
1778
1779 if ((p = strrchr (modname, '\\')) && xstrcasecmp (p, "\\bin") == 0)
1780 {
1781 char buf[SET_ENV_BUF_SIZE];
1782
1783 *p = 0;
1784 for (p = modname; *p; p++)
1785 if (*p == '\\') *p = '/';
1786
1787 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
1788 _putenv (strdup (buf));
1789 }
1790 /* Handle running emacs from the build directory: src/oo-spd/i386/ */
1791
1792 /* FIXME: should use substring of get_emacs_configuration ().
1793 But I don't think the Windows build supports alpha, mips etc
1794 anymore, so have taken the easy option for now. */
1795 else if (p && xstrcasecmp (p, "\\i386") == 0)
1796 {
1797 *p = 0;
1798 p = strrchr (modname, '\\');
1799 if (p != NULL)
1800 {
1801 *p = 0;
1802 p = strrchr (modname, '\\');
1803 if (p && xstrcasecmp (p, "\\src") == 0)
1804 {
1805 char buf[SET_ENV_BUF_SIZE];
1806
1807 *p = 0;
1808 for (p = modname; *p; p++)
1809 if (*p == '\\') *p = '/';
1810
1811 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
1812 _putenv (strdup (buf));
1813 }
1814 }
1815 }
1816 }
1817
1818 for (i = 0; i < N_ENV_VARS; i++)
1819 {
1820 if (!getenv (env_vars[i].name))
1821 {
1822 int dont_free = 0;
1823
1824 if ((lpval = w32_get_resource (env_vars[i].name, &dwType)) == NULL
1825 /* Also ignore empty environment variables. */
1826 || *lpval == 0)
1827 {
1828 xfree (lpval);
1829 lpval = env_vars[i].def_value;
1830 dwType = REG_EXPAND_SZ;
1831 dont_free = 1;
1832 if (!strcmp (env_vars[i].name, "HOME") && !appdata)
1833 Vdelayed_warnings_list
1834 = Fcons (listn (CONSTYPE_HEAP, 2,
1835 intern ("initialization"),
1836 build_string ("Setting HOME to C:\\ by default is deprecated")),
1837 Vdelayed_warnings_list);
1838 }
1839
1840 if (lpval)
1841 {
1842 char buf1[SET_ENV_BUF_SIZE], buf2[SET_ENV_BUF_SIZE];
1843
1844 if (dwType == REG_EXPAND_SZ)
1845 ExpandEnvironmentStrings ((LPSTR) lpval, buf1, sizeof (buf1));
1846 else if (dwType == REG_SZ)
1847 strcpy (buf1, lpval);
1848 if (dwType == REG_EXPAND_SZ || dwType == REG_SZ)
1849 {
1850 _snprintf (buf2, sizeof (buf2)-1, "%s=%s", env_vars[i].name,
1851 buf1);
1852 _putenv (strdup (buf2));
1853 }
1854
1855 if (!dont_free)
1856 xfree (lpval);
1857 }
1858 }
1859 }
1860 }
1861
1862 /* Rebuild system configuration to reflect invoking system. */
1863 Vsystem_configuration = build_string (EMACS_CONFIGURATION);
1864
1865 /* Another special case: on NT, the PATH variable is actually named
1866 "Path" although cmd.exe (perhaps NT itself) arranges for
1867 environment variable lookup and setting to be case insensitive.
1868 However, Emacs assumes a fully case sensitive environment, so we
1869 need to change "Path" to "PATH" to match the expectations of
1870 various elisp packages. We do this by the sneaky method of
1871 modifying the string in the C runtime environ entry.
1872
1873 The same applies to COMSPEC. */
1874 {
1875 char ** envp;
1876
1877 for (envp = environ; *envp; envp++)
1878 if (_strnicmp (*envp, "PATH=", 5) == 0)
1879 memcpy (*envp, "PATH=", 5);
1880 else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
1881 memcpy (*envp, "COMSPEC=", 8);
1882 }
1883
1884 /* Remember the initial working directory for getwd. */
1885 /* FIXME: Do we need to resolve possible symlinks in startup_dir?
1886 Does it matter anywhere in Emacs? */
1887 if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
1888 abort ();
1889
1890 {
1891 static char modname[MAX_PATH];
1892
1893 if (!GetModuleFileName (NULL, modname, MAX_PATH))
1894 abort ();
1895 argv[0] = modname;
1896 }
1897
1898 /* Determine if there is a middle mouse button, to allow parse_button
1899 to decide whether right mouse events should be mouse-2 or
1900 mouse-3. */
1901 w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
1902
1903 init_user_info ();
1904 }
1905
1906 /* Called from expand-file-name when default-directory is not a string. */
1907
1908 char *
1909 emacs_root_dir (void)
1910 {
1911 static char root_dir[FILENAME_MAX];
1912 const char *p;
1913
1914 p = getenv ("emacs_dir");
1915 if (p == NULL)
1916 abort ();
1917 strcpy (root_dir, p);
1918 root_dir[parse_root (root_dir, NULL)] = '\0';
1919 dostounix_filename (root_dir);
1920 return root_dir;
1921 }
1922
1923 /* We don't have scripts to automatically determine the system configuration
1924 for Emacs before it's compiled, and we don't want to have to make the
1925 user enter it, so we define EMACS_CONFIGURATION to invoke this runtime
1926 routine. */
1927
1928 char *
1929 get_emacs_configuration (void)
1930 {
1931 char *arch, *oem, *os;
1932 int build_num;
1933 static char configuration_buffer[32];
1934
1935 /* Determine the processor type. */
1936 switch (get_processor_type ())
1937 {
1938
1939 #ifdef PROCESSOR_INTEL_386
1940 case PROCESSOR_INTEL_386:
1941 case PROCESSOR_INTEL_486:
1942 case PROCESSOR_INTEL_PENTIUM:
1943 arch = "i386";
1944 break;
1945 #endif
1946
1947 #ifdef PROCESSOR_MIPS_R2000
1948 case PROCESSOR_MIPS_R2000:
1949 case PROCESSOR_MIPS_R3000:
1950 case PROCESSOR_MIPS_R4000:
1951 arch = "mips";
1952 break;
1953 #endif
1954
1955 #ifdef PROCESSOR_ALPHA_21064
1956 case PROCESSOR_ALPHA_21064:
1957 arch = "alpha";
1958 break;
1959 #endif
1960
1961 default:
1962 arch = "unknown";
1963 break;
1964 }
1965
1966 /* Use the OEM field to reflect the compiler/library combination. */
1967 #ifdef _MSC_VER
1968 #define COMPILER_NAME "msvc"
1969 #else
1970 #ifdef __GNUC__
1971 #define COMPILER_NAME "mingw"
1972 #else
1973 #define COMPILER_NAME "unknown"
1974 #endif
1975 #endif
1976 oem = COMPILER_NAME;
1977
1978 switch (osinfo_cache.dwPlatformId) {
1979 case VER_PLATFORM_WIN32_NT:
1980 os = "nt";
1981 build_num = osinfo_cache.dwBuildNumber;
1982 break;
1983 case VER_PLATFORM_WIN32_WINDOWS:
1984 if (osinfo_cache.dwMinorVersion == 0) {
1985 os = "windows95";
1986 } else {
1987 os = "windows98";
1988 }
1989 build_num = LOWORD (osinfo_cache.dwBuildNumber);
1990 break;
1991 case VER_PLATFORM_WIN32s:
1992 /* Not supported, should not happen. */
1993 os = "windows32s";
1994 build_num = LOWORD (osinfo_cache.dwBuildNumber);
1995 break;
1996 default:
1997 os = "unknown";
1998 build_num = 0;
1999 break;
2000 }
2001
2002 if (osinfo_cache.dwPlatformId == VER_PLATFORM_WIN32_NT) {
2003 sprintf (configuration_buffer, "%s-%s-%s%d.%d.%d", arch, oem, os,
2004 get_w32_major_version (), get_w32_minor_version (), build_num);
2005 } else {
2006 sprintf (configuration_buffer, "%s-%s-%s.%d", arch, oem, os, build_num);
2007 }
2008
2009 return configuration_buffer;
2010 }
2011
2012 char *
2013 get_emacs_configuration_options (void)
2014 {
2015 static char *options_buffer;
2016 char cv[32]; /* Enough for COMPILER_VERSION. */
2017 char *options[] = {
2018 cv, /* To be filled later. */
2019 #ifdef EMACSDEBUG
2020 " --no-opt",
2021 #endif
2022 #ifdef ENABLE_CHECKING
2023 " --enable-checking",
2024 #endif
2025 /* configure.bat already sets USER_CFLAGS and USER_LDFLAGS
2026 with a starting space to save work here. */
2027 #ifdef USER_CFLAGS
2028 " --cflags", USER_CFLAGS,
2029 #endif
2030 #ifdef USER_LDFLAGS
2031 " --ldflags", USER_LDFLAGS,
2032 #endif
2033 NULL
2034 };
2035 size_t size = 0;
2036 int i;
2037
2038 /* Work out the effective configure options for this build. */
2039 #ifdef _MSC_VER
2040 #define COMPILER_VERSION "--with-msvc (%d.%02d)", _MSC_VER / 100, _MSC_VER % 100
2041 #else
2042 #ifdef __GNUC__
2043 #define COMPILER_VERSION "--with-gcc (%d.%d)", __GNUC__, __GNUC_MINOR__
2044 #else
2045 #define COMPILER_VERSION ""
2046 #endif
2047 #endif
2048
2049 if (_snprintf (cv, sizeof (cv) - 1, COMPILER_VERSION) < 0)
2050 return "Error: not enough space for compiler version";
2051 cv[sizeof (cv) - 1] = '\0';
2052
2053 for (i = 0; options[i]; i++)
2054 size += strlen (options[i]);
2055
2056 options_buffer = xmalloc (size + 1);
2057 options_buffer[0] = '\0';
2058
2059 for (i = 0; options[i]; i++)
2060 strcat (options_buffer, options[i]);
2061
2062 return options_buffer;
2063 }
2064
2065
2066 #include <sys/timeb.h>
2067
2068 /* Emulate gettimeofday (Ulrich Leodolter, 1/11/95). */
2069 void
2070 gettimeofday (struct timeval *tv, struct timezone *tz)
2071 {
2072 struct _timeb tb;
2073 _ftime (&tb);
2074
2075 tv->tv_sec = tb.time;
2076 tv->tv_usec = tb.millitm * 1000L;
2077 /* Implementation note: _ftime sometimes doesn't update the dstflag
2078 according to the new timezone when the system timezone is
2079 changed. We could fix that by using GetSystemTime and
2080 GetTimeZoneInformation, but that doesn't seem necessary, since
2081 Emacs always calls gettimeofday with the 2nd argument NULL (see
2082 current_emacs_time). */
2083 if (tz)
2084 {
2085 tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich */
2086 tz->tz_dsttime = tb.dstflag; /* type of dst correction */
2087 }
2088 }
2089
2090 /* Emulate fdutimens. */
2091
2092 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
2093 TIMESPEC[0] and TIMESPEC[1], respectively.
2094 FD must be either negative -- in which case it is ignored --
2095 or a file descriptor that is open on FILE.
2096 If FD is nonnegative, then FILE can be NULL, which means
2097 use just futimes instead of utimes.
2098 If TIMESPEC is null, FAIL.
2099 Return 0 on success, -1 (setting errno) on failure. */
2100
2101 int
2102 fdutimens (int fd, char const *file, struct timespec const timespec[2])
2103 {
2104 struct _utimbuf ut;
2105
2106 if (!timespec)
2107 {
2108 errno = ENOSYS;
2109 return -1;
2110 }
2111 if (fd < 0 && !file)
2112 {
2113 errno = EBADF;
2114 return -1;
2115 }
2116 ut.actime = timespec[0].tv_sec;
2117 ut.modtime = timespec[1].tv_sec;
2118 if (fd >= 0)
2119 return _futime (fd, &ut);
2120 else
2121 return _utime (file, &ut);
2122 }
2123
2124
2125 /* ------------------------------------------------------------------------- */
2126 /* IO support and wrapper functions for the Windows API. */
2127 /* ------------------------------------------------------------------------- */
2128
2129 /* Place a wrapper around the MSVC version of ctime. It returns NULL
2130 on network directories, so we handle that case here.
2131 (Ulrich Leodolter, 1/11/95). */
2132 char *
2133 sys_ctime (const time_t *t)
2134 {
2135 char *str = (char *) ctime (t);
2136 return (str ? str : "Sun Jan 01 00:00:00 1970");
2137 }
2138
2139 /* Emulate sleep...we could have done this with a define, but that
2140 would necessitate including windows.h in the files that used it.
2141 This is much easier. */
2142 void
2143 sys_sleep (int seconds)
2144 {
2145 Sleep (seconds * 1000);
2146 }
2147
2148 /* Internal MSVC functions for low-level descriptor munging */
2149 extern int __cdecl _set_osfhnd (int fd, long h);
2150 extern int __cdecl _free_osfhnd (int fd);
2151
2152 /* parallel array of private info on file handles */
2153 filedesc fd_info [ MAXDESC ];
2154
2155 typedef struct volume_info_data {
2156 struct volume_info_data * next;
2157
2158 /* time when info was obtained */
2159 DWORD timestamp;
2160
2161 /* actual volume info */
2162 char * root_dir;
2163 DWORD serialnum;
2164 DWORD maxcomp;
2165 DWORD flags;
2166 char * name;
2167 char * type;
2168 } volume_info_data;
2169
2170 /* Global referenced by various functions. */
2171 static volume_info_data volume_info;
2172
2173 /* Vector to indicate which drives are local and fixed (for which cached
2174 data never expires). */
2175 static BOOL fixed_drives[26];
2176
2177 /* Consider cached volume information to be stale if older than 10s,
2178 at least for non-local drives. Info for fixed drives is never stale. */
2179 #define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
2180 #define VOLINFO_STILL_VALID( root_dir, info ) \
2181 ( ( isalpha (root_dir[0]) && \
2182 fixed_drives[ DRIVE_INDEX (root_dir[0]) ] ) \
2183 || GetTickCount () - info->timestamp < 10000 )
2184
2185 /* Cache support functions. */
2186
2187 /* Simple linked list with linear search is sufficient. */
2188 static volume_info_data *volume_cache = NULL;
2189
2190 static volume_info_data *
2191 lookup_volume_info (char * root_dir)
2192 {
2193 volume_info_data * info;
2194
2195 for (info = volume_cache; info; info = info->next)
2196 if (xstrcasecmp (info->root_dir, root_dir) == 0)
2197 break;
2198 return info;
2199 }
2200
2201 static void
2202 add_volume_info (char * root_dir, volume_info_data * info)
2203 {
2204 info->root_dir = xstrdup (root_dir);
2205 info->next = volume_cache;
2206 volume_cache = info;
2207 }
2208
2209
2210 /* Wrapper for GetVolumeInformation, which uses caching to avoid
2211 performance penalty (~2ms on 486 for local drives, 7.5ms for local
2212 cdrom drive, ~5-10ms or more for remote drives on LAN). */
2213 static volume_info_data *
2214 GetCachedVolumeInformation (char * root_dir)
2215 {
2216 volume_info_data * info;
2217 char default_root[ MAX_PATH ];
2218
2219 /* NULL for root_dir means use root from current directory. */
2220 if (root_dir == NULL)
2221 {
2222 if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
2223 return NULL;
2224 parse_root (default_root, &root_dir);
2225 *root_dir = 0;
2226 root_dir = default_root;
2227 }
2228
2229 /* Local fixed drives can be cached permanently. Removable drives
2230 cannot be cached permanently, since the volume name and serial
2231 number (if nothing else) can change. Remote drives should be
2232 treated as if they are removable, since there is no sure way to
2233 tell whether they are or not. Also, the UNC association of drive
2234 letters mapped to remote volumes can be changed at any time (even
2235 by other processes) without notice.
2236
2237 As a compromise, so we can benefit from caching info for remote
2238 volumes, we use a simple expiry mechanism to invalidate cache
2239 entries that are more than ten seconds old. */
2240
2241 #if 0
2242 /* No point doing this, because WNetGetConnection is even slower than
2243 GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
2244 GetDriveType is about the only call of this type which does not
2245 involve network access, and so is extremely quick). */
2246
2247 /* Map drive letter to UNC if remote. */
2248 if (isalpha (root_dir[0]) && !fixed[DRIVE_INDEX (root_dir[0])])
2249 {
2250 char remote_name[ 256 ];
2251 char drive[3] = { root_dir[0], ':' };
2252
2253 if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
2254 == NO_ERROR)
2255 /* do something */ ;
2256 }
2257 #endif
2258
2259 info = lookup_volume_info (root_dir);
2260
2261 if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
2262 {
2263 char name[ 256 ];
2264 DWORD serialnum;
2265 DWORD maxcomp;
2266 DWORD flags;
2267 char type[ 256 ];
2268
2269 /* Info is not cached, or is stale. */
2270 if (!GetVolumeInformation (root_dir,
2271 name, sizeof (name),
2272 &serialnum,
2273 &maxcomp,
2274 &flags,
2275 type, sizeof (type)))
2276 return NULL;
2277
2278 /* Cache the volume information for future use, overwriting existing
2279 entry if present. */
2280 if (info == NULL)
2281 {
2282 info = xmalloc (sizeof (volume_info_data));
2283 add_volume_info (root_dir, info);
2284 }
2285 else
2286 {
2287 xfree (info->name);
2288 xfree (info->type);
2289 }
2290
2291 info->name = xstrdup (name);
2292 info->serialnum = serialnum;
2293 info->maxcomp = maxcomp;
2294 info->flags = flags;
2295 info->type = xstrdup (type);
2296 info->timestamp = GetTickCount ();
2297 }
2298
2299 return info;
2300 }
2301
2302 /* Get information on the volume where NAME is held; set path pointer to
2303 start of pathname in NAME (past UNC header\volume header if present),
2304 if pPath is non-NULL.
2305
2306 Note: if NAME includes symlinks, the information is for the volume
2307 of the symlink, not of its target. That's because, even though
2308 GetVolumeInformation returns information about the symlink target
2309 of its argument, we only pass the root directory to
2310 GetVolumeInformation, not the full NAME. */
2311 static int
2312 get_volume_info (const char * name, const char ** pPath)
2313 {
2314 char temp[MAX_PATH];
2315 char *rootname = NULL; /* default to current volume */
2316 volume_info_data * info;
2317
2318 if (name == NULL)
2319 return FALSE;
2320
2321 /* Find the root name of the volume if given. */
2322 if (isalpha (name[0]) && name[1] == ':')
2323 {
2324 rootname = temp;
2325 temp[0] = *name++;
2326 temp[1] = *name++;
2327 temp[2] = '\\';
2328 temp[3] = 0;
2329 }
2330 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
2331 {
2332 char *str = temp;
2333 int slashes = 4;
2334 rootname = temp;
2335 do
2336 {
2337 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
2338 break;
2339 *str++ = *name++;
2340 }
2341 while ( *name );
2342
2343 *str++ = '\\';
2344 *str = 0;
2345 }
2346
2347 if (pPath)
2348 *pPath = name;
2349
2350 info = GetCachedVolumeInformation (rootname);
2351 if (info != NULL)
2352 {
2353 /* Set global referenced by other functions. */
2354 volume_info = *info;
2355 return TRUE;
2356 }
2357 return FALSE;
2358 }
2359
2360 /* Determine if volume is FAT format (ie. only supports short 8.3
2361 names); also set path pointer to start of pathname in name, if
2362 pPath is non-NULL. */
2363 static int
2364 is_fat_volume (const char * name, const char ** pPath)
2365 {
2366 if (get_volume_info (name, pPath))
2367 return (volume_info.maxcomp == 12);
2368 return FALSE;
2369 }
2370
2371 /* Map filename to a valid 8.3 name if necessary.
2372 The result is a pointer to a static buffer, so CAVEAT EMPTOR! */
2373 const char *
2374 map_w32_filename (const char * name, const char ** pPath)
2375 {
2376 static char shortname[MAX_PATH];
2377 char * str = shortname;
2378 char c;
2379 char * path;
2380 const char * save_name = name;
2381
2382 if (strlen (name) >= MAX_PATH)
2383 {
2384 /* Return a filename which will cause callers to fail. */
2385 strcpy (shortname, "?");
2386 return shortname;
2387 }
2388
2389 if (is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
2390 {
2391 register int left = 8; /* maximum number of chars in part */
2392 register int extn = 0; /* extension added? */
2393 register int dots = 2; /* maximum number of dots allowed */
2394
2395 while (name < path)
2396 *str++ = *name++; /* skip past UNC header */
2397
2398 while ((c = *name++))
2399 {
2400 switch ( c )
2401 {
2402 case ':':
2403 case '\\':
2404 case '/':
2405 *str++ = (c == ':' ? ':' : '\\');
2406 extn = 0; /* reset extension flags */
2407 dots = 2; /* max 2 dots */
2408 left = 8; /* max length 8 for main part */
2409 break;
2410 case '.':
2411 if ( dots )
2412 {
2413 /* Convert path components of the form .xxx to _xxx,
2414 but leave . and .. as they are. This allows .emacs
2415 to be read as _emacs, for example. */
2416
2417 if (! *name ||
2418 *name == '.' ||
2419 IS_DIRECTORY_SEP (*name))
2420 {
2421 *str++ = '.';
2422 dots--;
2423 }
2424 else
2425 {
2426 *str++ = '_';
2427 left--;
2428 dots = 0;
2429 }
2430 }
2431 else if ( !extn )
2432 {
2433 *str++ = '.';
2434 extn = 1; /* we've got an extension */
2435 left = 3; /* 3 chars in extension */
2436 }
2437 else
2438 {
2439 /* any embedded dots after the first are converted to _ */
2440 *str++ = '_';
2441 }
2442 break;
2443 case '~':
2444 case '#': /* don't lose these, they're important */
2445 if ( ! left )
2446 str[-1] = c; /* replace last character of part */
2447 /* FALLTHRU */
2448 default:
2449 if ( left )
2450 {
2451 *str++ = tolower (c); /* map to lower case (looks nicer) */
2452 left--;
2453 dots = 0; /* started a path component */
2454 }
2455 break;
2456 }
2457 }
2458 *str = '\0';
2459 }
2460 else
2461 {
2462 strcpy (shortname, name);
2463 unixtodos_filename (shortname);
2464 }
2465
2466 if (pPath)
2467 *pPath = shortname + (path - save_name);
2468
2469 return shortname;
2470 }
2471
2472 static int
2473 is_exec (const char * name)
2474 {
2475 char * p = strrchr (name, '.');
2476 return
2477 (p != NULL
2478 && (xstrcasecmp (p, ".exe") == 0 ||
2479 xstrcasecmp (p, ".com") == 0 ||
2480 xstrcasecmp (p, ".bat") == 0 ||
2481 xstrcasecmp (p, ".cmd") == 0));
2482 }
2483
2484 /* Emulate the Unix directory procedures opendir, closedir,
2485 and readdir. We can't use the procedures supplied in sysdep.c,
2486 so we provide them here. */
2487
2488 struct direct dir_static; /* simulated directory contents */
2489 static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
2490 static int dir_is_fat;
2491 static char dir_pathname[MAXPATHLEN+1];
2492 static WIN32_FIND_DATA dir_find_data;
2493
2494 /* Support shares on a network resource as subdirectories of a read-only
2495 root directory. */
2496 static HANDLE wnet_enum_handle = INVALID_HANDLE_VALUE;
2497 static HANDLE open_unc_volume (const char *);
2498 static char *read_unc_volume (HANDLE, char *, int);
2499 static void close_unc_volume (HANDLE);
2500
2501 DIR *
2502 opendir (char *filename)
2503 {
2504 DIR *dirp;
2505
2506 /* Opening is done by FindFirstFile. However, a read is inherent to
2507 this operation, so we defer the open until read time. */
2508
2509 if (dir_find_handle != INVALID_HANDLE_VALUE)
2510 return NULL;
2511 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2512 return NULL;
2513
2514 /* Note: We don't support traversal of UNC volumes via symlinks.
2515 Doing so would mean punishing 99.99% of use cases by resolving
2516 all the possible symlinks in FILENAME, recursively. */
2517 if (is_unc_volume (filename))
2518 {
2519 wnet_enum_handle = open_unc_volume (filename);
2520 if (wnet_enum_handle == INVALID_HANDLE_VALUE)
2521 return NULL;
2522 }
2523
2524 if (!(dirp = (DIR *) malloc (sizeof (DIR))))
2525 return NULL;
2526
2527 dirp->dd_fd = 0;
2528 dirp->dd_loc = 0;
2529 dirp->dd_size = 0;
2530
2531 strncpy (dir_pathname, map_w32_filename (filename, NULL), MAXPATHLEN);
2532 dir_pathname[MAXPATHLEN] = '\0';
2533 /* Note: We don't support symlinks to file names on FAT volumes.
2534 Doing so would mean punishing 99.99% of use cases by resolving
2535 all the possible symlinks in FILENAME, recursively. */
2536 dir_is_fat = is_fat_volume (filename, NULL);
2537
2538 return dirp;
2539 }
2540
2541 void
2542 closedir (DIR *dirp)
2543 {
2544 /* If we have a find-handle open, close it. */
2545 if (dir_find_handle != INVALID_HANDLE_VALUE)
2546 {
2547 FindClose (dir_find_handle);
2548 dir_find_handle = INVALID_HANDLE_VALUE;
2549 }
2550 else if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2551 {
2552 close_unc_volume (wnet_enum_handle);
2553 wnet_enum_handle = INVALID_HANDLE_VALUE;
2554 }
2555 xfree ((char *) dirp);
2556 }
2557
2558 struct direct *
2559 readdir (DIR *dirp)
2560 {
2561 int downcase = !NILP (Vw32_downcase_file_names);
2562
2563 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2564 {
2565 if (!read_unc_volume (wnet_enum_handle,
2566 dir_find_data.cFileName,
2567 MAX_PATH))
2568 return NULL;
2569 }
2570 /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
2571 else if (dir_find_handle == INVALID_HANDLE_VALUE)
2572 {
2573 char filename[MAXNAMLEN + 3];
2574 int ln;
2575
2576 strcpy (filename, dir_pathname);
2577 ln = strlen (filename) - 1;
2578 if (!IS_DIRECTORY_SEP (filename[ln]))
2579 strcat (filename, "\\");
2580 strcat (filename, "*");
2581
2582 /* Note: No need to resolve symlinks in FILENAME, because
2583 FindFirst opens the directory that is the target of a
2584 symlink. */
2585 dir_find_handle = FindFirstFile (filename, &dir_find_data);
2586
2587 if (dir_find_handle == INVALID_HANDLE_VALUE)
2588 return NULL;
2589 }
2590 else
2591 {
2592 if (!FindNextFile (dir_find_handle, &dir_find_data))
2593 return NULL;
2594 }
2595
2596 /* Emacs never uses this value, so don't bother making it match
2597 value returned by stat(). */
2598 dir_static.d_ino = 1;
2599
2600 strcpy (dir_static.d_name, dir_find_data.cFileName);
2601
2602 /* If the file name in cFileName[] includes `?' characters, it means
2603 the original file name used characters that cannot be represented
2604 by the current ANSI codepage. To avoid total lossage, retrieve
2605 the short 8+3 alias of the long file name. */
2606 if (_mbspbrk (dir_static.d_name, "?"))
2607 {
2608 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
2609 downcase = 1; /* 8+3 aliases are returned in all caps */
2610 }
2611 dir_static.d_namlen = strlen (dir_static.d_name);
2612 dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
2613 dir_static.d_namlen - dir_static.d_namlen % 4;
2614
2615 /* If the file name in cFileName[] includes `?' characters, it means
2616 the original file name used characters that cannot be represented
2617 by the current ANSI codepage. To avoid total lossage, retrieve
2618 the short 8+3 alias of the long file name. */
2619 if (_mbspbrk (dir_find_data.cFileName, "?"))
2620 {
2621 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
2622 /* 8+3 aliases are returned in all caps, which could break
2623 various alists that look at filenames' extensions. */
2624 downcase = 1;
2625 }
2626 else
2627 strcpy (dir_static.d_name, dir_find_data.cFileName);
2628 dir_static.d_namlen = strlen (dir_static.d_name);
2629 if (dir_is_fat)
2630 _strlwr (dir_static.d_name);
2631 else if (downcase)
2632 {
2633 register char *p;
2634 for (p = dir_static.d_name; *p; p++)
2635 if (*p >= 'a' && *p <= 'z')
2636 break;
2637 if (!*p)
2638 _strlwr (dir_static.d_name);
2639 }
2640
2641 return &dir_static;
2642 }
2643
2644 static HANDLE
2645 open_unc_volume (const char *path)
2646 {
2647 NETRESOURCE nr;
2648 HANDLE henum;
2649 int result;
2650
2651 nr.dwScope = RESOURCE_GLOBALNET;
2652 nr.dwType = RESOURCETYPE_DISK;
2653 nr.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER;
2654 nr.dwUsage = RESOURCEUSAGE_CONTAINER;
2655 nr.lpLocalName = NULL;
2656 nr.lpRemoteName = (LPSTR)map_w32_filename (path, NULL);
2657 nr.lpComment = NULL;
2658 nr.lpProvider = NULL;
2659
2660 result = WNetOpenEnum (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
2661 RESOURCEUSAGE_CONNECTABLE, &nr, &henum);
2662
2663 if (result == NO_ERROR)
2664 return henum;
2665 else
2666 return INVALID_HANDLE_VALUE;
2667 }
2668
2669 static char *
2670 read_unc_volume (HANDLE henum, char *readbuf, int size)
2671 {
2672 DWORD count;
2673 int result;
2674 DWORD bufsize = 512;
2675 char *buffer;
2676 char *ptr;
2677
2678 count = 1;
2679 buffer = alloca (bufsize);
2680 result = WNetEnumResource (henum, &count, buffer, &bufsize);
2681 if (result != NO_ERROR)
2682 return NULL;
2683
2684 /* WNetEnumResource returns \\resource\share...skip forward to "share". */
2685 ptr = ((LPNETRESOURCE) buffer)->lpRemoteName;
2686 ptr += 2;
2687 while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
2688 ptr++;
2689
2690 strncpy (readbuf, ptr, size);
2691 return readbuf;
2692 }
2693
2694 static void
2695 close_unc_volume (HANDLE henum)
2696 {
2697 if (henum != INVALID_HANDLE_VALUE)
2698 WNetCloseEnum (henum);
2699 }
2700
2701 static DWORD
2702 unc_volume_file_attributes (const char *path)
2703 {
2704 HANDLE henum;
2705 DWORD attrs;
2706
2707 henum = open_unc_volume (path);
2708 if (henum == INVALID_HANDLE_VALUE)
2709 return -1;
2710
2711 attrs = FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY;
2712
2713 close_unc_volume (henum);
2714
2715 return attrs;
2716 }
2717
2718 /* Ensure a network connection is authenticated. */
2719 static void
2720 logon_network_drive (const char *path)
2721 {
2722 NETRESOURCE resource;
2723 char share[MAX_PATH];
2724 int i, n_slashes;
2725 char drive[4];
2726 UINT drvtype;
2727
2728 if (IS_DIRECTORY_SEP (path[0]) && IS_DIRECTORY_SEP (path[1]))
2729 drvtype = DRIVE_REMOTE;
2730 else if (path[0] == '\0' || path[1] != ':')
2731 drvtype = GetDriveType (NULL);
2732 else
2733 {
2734 drive[0] = path[0];
2735 drive[1] = ':';
2736 drive[2] = '\\';
2737 drive[3] = '\0';
2738 drvtype = GetDriveType (drive);
2739 }
2740
2741 /* Only logon to networked drives. */
2742 if (drvtype != DRIVE_REMOTE)
2743 return;
2744
2745 n_slashes = 2;
2746 strncpy (share, path, MAX_PATH);
2747 /* Truncate to just server and share name. */
2748 for (i = 2; i < MAX_PATH; i++)
2749 {
2750 if (IS_DIRECTORY_SEP (share[i]) && ++n_slashes > 3)
2751 {
2752 share[i] = '\0';
2753 break;
2754 }
2755 }
2756
2757 resource.dwType = RESOURCETYPE_DISK;
2758 resource.lpLocalName = NULL;
2759 resource.lpRemoteName = share;
2760 resource.lpProvider = NULL;
2761
2762 WNetAddConnection2 (&resource, NULL, NULL, CONNECT_INTERACTIVE);
2763 }
2764
2765 /* Shadow some MSVC runtime functions to map requests for long filenames
2766 to reasonable short names if necessary. This was originally added to
2767 permit running Emacs on NT 3.1 on a FAT partition, which doesn't support
2768 long file names. */
2769
2770 int
2771 sys_access (const char * path, int mode)
2772 {
2773 DWORD attributes;
2774
2775 /* MSVCRT implementation of 'access' doesn't recognize D_OK, and its
2776 newer versions blow up when passed D_OK. */
2777 path = map_w32_filename (path, NULL);
2778 /* If the last element of PATH is a symlink, we need to resolve it
2779 to get the attributes of its target file. Note: any symlinks in
2780 PATH elements other than the last one are transparently resolved
2781 by GetFileAttributes below. */
2782 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
2783 path = chase_symlinks (path);
2784
2785 if ((attributes = GetFileAttributes (path)) == -1)
2786 {
2787 DWORD w32err = GetLastError ();
2788
2789 switch (w32err)
2790 {
2791 case ERROR_INVALID_NAME:
2792 case ERROR_BAD_PATHNAME:
2793 if (is_unc_volume (path))
2794 {
2795 attributes = unc_volume_file_attributes (path);
2796 if (attributes == -1)
2797 {
2798 errno = EACCES;
2799 return -1;
2800 }
2801 break;
2802 }
2803 /* FALLTHROUGH */
2804 case ERROR_FILE_NOT_FOUND:
2805 case ERROR_BAD_NETPATH:
2806 errno = ENOENT;
2807 break;
2808 default:
2809 errno = EACCES;
2810 break;
2811 }
2812 return -1;
2813 }
2814 if ((mode & X_OK) != 0 && !is_exec (path))
2815 {
2816 errno = EACCES;
2817 return -1;
2818 }
2819 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
2820 {
2821 errno = EACCES;
2822 return -1;
2823 }
2824 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
2825 {
2826 errno = EACCES;
2827 return -1;
2828 }
2829 return 0;
2830 }
2831
2832 int
2833 sys_chdir (const char * path)
2834 {
2835 return _chdir (map_w32_filename (path, NULL));
2836 }
2837
2838 int
2839 sys_chmod (const char * path, int mode)
2840 {
2841 path = chase_symlinks (map_w32_filename (path, NULL));
2842 return _chmod (path, mode);
2843 }
2844
2845 int
2846 sys_chown (const char *path, uid_t owner, gid_t group)
2847 {
2848 if (sys_chmod (path, S_IREAD) == -1) /* check if file exists */
2849 return -1;
2850 return 0;
2851 }
2852
2853 int
2854 sys_creat (const char * path, int mode)
2855 {
2856 return _creat (map_w32_filename (path, NULL), mode);
2857 }
2858
2859 FILE *
2860 sys_fopen (const char * path, const char * mode)
2861 {
2862 int fd;
2863 int oflag;
2864 const char * mode_save = mode;
2865
2866 /* Force all file handles to be non-inheritable. This is necessary to
2867 ensure child processes don't unwittingly inherit handles that might
2868 prevent future file access. */
2869
2870 if (mode[0] == 'r')
2871 oflag = O_RDONLY;
2872 else if (mode[0] == 'w' || mode[0] == 'a')
2873 oflag = O_WRONLY | O_CREAT | O_TRUNC;
2874 else
2875 return NULL;
2876
2877 /* Only do simplistic option parsing. */
2878 while (*++mode)
2879 if (mode[0] == '+')
2880 {
2881 oflag &= ~(O_RDONLY | O_WRONLY);
2882 oflag |= O_RDWR;
2883 }
2884 else if (mode[0] == 'b')
2885 {
2886 oflag &= ~O_TEXT;
2887 oflag |= O_BINARY;
2888 }
2889 else if (mode[0] == 't')
2890 {
2891 oflag &= ~O_BINARY;
2892 oflag |= O_TEXT;
2893 }
2894 else break;
2895
2896 fd = _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
2897 if (fd < 0)
2898 return NULL;
2899
2900 return _fdopen (fd, mode_save);
2901 }
2902
2903 /* This only works on NTFS volumes, but is useful to have. */
2904 int
2905 sys_link (const char * old, const char * new)
2906 {
2907 HANDLE fileh;
2908 int result = -1;
2909 char oldname[MAX_PATH], newname[MAX_PATH];
2910
2911 if (old == NULL || new == NULL)
2912 {
2913 errno = ENOENT;
2914 return -1;
2915 }
2916
2917 strcpy (oldname, map_w32_filename (old, NULL));
2918 strcpy (newname, map_w32_filename (new, NULL));
2919
2920 fileh = CreateFile (oldname, 0, 0, NULL, OPEN_EXISTING,
2921 FILE_FLAG_BACKUP_SEMANTICS, NULL);
2922 if (fileh != INVALID_HANDLE_VALUE)
2923 {
2924 int wlen;
2925
2926 /* Confusingly, the "alternate" stream name field does not apply
2927 when restoring a hard link, and instead contains the actual
2928 stream data for the link (ie. the name of the link to create).
2929 The WIN32_STREAM_ID structure before the cStreamName field is
2930 the stream header, which is then immediately followed by the
2931 stream data. */
2932
2933 struct {
2934 WIN32_STREAM_ID wid;
2935 WCHAR wbuffer[MAX_PATH]; /* extra space for link name */
2936 } data;
2937
2938 wlen = MultiByteToWideChar (CP_ACP, MB_PRECOMPOSED, newname, -1,
2939 data.wid.cStreamName, MAX_PATH);
2940 if (wlen > 0)
2941 {
2942 LPVOID context = NULL;
2943 DWORD wbytes = 0;
2944
2945 data.wid.dwStreamId = BACKUP_LINK;
2946 data.wid.dwStreamAttributes = 0;
2947 data.wid.Size.LowPart = wlen * sizeof (WCHAR);
2948 data.wid.Size.HighPart = 0;
2949 data.wid.dwStreamNameSize = 0;
2950
2951 if (BackupWrite (fileh, (LPBYTE)&data,
2952 offsetof (WIN32_STREAM_ID, cStreamName)
2953 + data.wid.Size.LowPart,
2954 &wbytes, FALSE, FALSE, &context)
2955 && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
2956 {
2957 /* succeeded */
2958 result = 0;
2959 }
2960 else
2961 {
2962 /* Should try mapping GetLastError to errno; for now just
2963 indicate a general error (eg. links not supported). */
2964 errno = EINVAL; // perhaps EMLINK?
2965 }
2966 }
2967
2968 CloseHandle (fileh);
2969 }
2970 else
2971 errno = ENOENT;
2972
2973 return result;
2974 }
2975
2976 int
2977 sys_mkdir (const char * path)
2978 {
2979 return _mkdir (map_w32_filename (path, NULL));
2980 }
2981
2982 /* Because of long name mapping issues, we need to implement this
2983 ourselves. Also, MSVC's _mktemp returns NULL when it can't generate
2984 a unique name, instead of setting the input template to an empty
2985 string.
2986
2987 Standard algorithm seems to be use pid or tid with a letter on the
2988 front (in place of the 6 X's) and cycle through the letters to find a
2989 unique name. We extend that to allow any reasonable character as the
2990 first of the 6 X's. */
2991 char *
2992 sys_mktemp (char * template)
2993 {
2994 char * p;
2995 int i;
2996 unsigned uid = GetCurrentThreadId ();
2997 static char first_char[] = "abcdefghijklmnopqrstuvwyz0123456789!%-_@#";
2998
2999 if (template == NULL)
3000 return NULL;
3001 p = template + strlen (template);
3002 i = 5;
3003 /* replace up to the last 5 X's with uid in decimal */
3004 while (--p >= template && p[0] == 'X' && --i >= 0)
3005 {
3006 p[0] = '0' + uid % 10;
3007 uid /= 10;
3008 }
3009
3010 if (i < 0 && p[0] == 'X')
3011 {
3012 i = 0;
3013 do
3014 {
3015 int save_errno = errno;
3016 p[0] = first_char[i];
3017 if (sys_access (template, 0) < 0)
3018 {
3019 errno = save_errno;
3020 return template;
3021 }
3022 }
3023 while (++i < sizeof (first_char));
3024 }
3025
3026 /* Template is badly formed or else we can't generate a unique name,
3027 so return empty string */
3028 template[0] = 0;
3029 return template;
3030 }
3031
3032 int
3033 sys_open (const char * path, int oflag, int mode)
3034 {
3035 const char* mpath = map_w32_filename (path, NULL);
3036 /* Try to open file without _O_CREAT, to be able to write to hidden
3037 and system files. Force all file handles to be
3038 non-inheritable. */
3039 int res = _open (mpath, (oflag & ~_O_CREAT) | _O_NOINHERIT, mode);
3040 if (res >= 0)
3041 return res;
3042 return _open (mpath, oflag | _O_NOINHERIT, mode);
3043 }
3044
3045 int
3046 sys_rename (const char * oldname, const char * newname)
3047 {
3048 BOOL result;
3049 char temp[MAX_PATH];
3050 int newname_dev;
3051 int oldname_dev;
3052
3053 /* MoveFile on Windows 95 doesn't correctly change the short file name
3054 alias in a number of circumstances (it is not easy to predict when
3055 just by looking at oldname and newname, unfortunately). In these
3056 cases, renaming through a temporary name avoids the problem.
3057
3058 A second problem on Windows 95 is that renaming through a temp name when
3059 newname is uppercase fails (the final long name ends up in
3060 lowercase, although the short alias might be uppercase) UNLESS the
3061 long temp name is not 8.3.
3062
3063 So, on Windows 95 we always rename through a temp name, and we make sure
3064 the temp name has a long extension to ensure correct renaming. */
3065
3066 strcpy (temp, map_w32_filename (oldname, NULL));
3067
3068 /* volume_info is set indirectly by map_w32_filename. */
3069 oldname_dev = volume_info.serialnum;
3070
3071 if (os_subtype == OS_9X)
3072 {
3073 char * o;
3074 char * p;
3075 int i = 0;
3076
3077 oldname = map_w32_filename (oldname, NULL);
3078 if ((o = strrchr (oldname, '\\')))
3079 o++;
3080 else
3081 o = (char *) oldname;
3082
3083 if ((p = strrchr (temp, '\\')))
3084 p++;
3085 else
3086 p = temp;
3087
3088 do
3089 {
3090 /* Force temp name to require a manufactured 8.3 alias - this
3091 seems to make the second rename work properly. */
3092 sprintf (p, "_.%s.%u", o, i);
3093 i++;
3094 result = rename (oldname, temp);
3095 }
3096 /* This loop must surely terminate! */
3097 while (result < 0 && errno == EEXIST);
3098 if (result < 0)
3099 return -1;
3100 }
3101
3102 /* Emulate Unix behavior - newname is deleted if it already exists
3103 (at least if it is a file; don't do this for directories).
3104
3105 Since we mustn't do this if we are just changing the case of the
3106 file name (we would end up deleting the file we are trying to
3107 rename!), we let rename detect if the destination file already
3108 exists - that way we avoid the possible pitfalls of trying to
3109 determine ourselves whether two names really refer to the same
3110 file, which is not always possible in the general case. (Consider
3111 all the permutations of shared or subst'd drives, etc.) */
3112
3113 newname = map_w32_filename (newname, NULL);
3114
3115 /* volume_info is set indirectly by map_w32_filename. */
3116 newname_dev = volume_info.serialnum;
3117
3118 result = rename (temp, newname);
3119
3120 if (result < 0)
3121 {
3122 DWORD w32err = GetLastError ();
3123
3124 if (errno == EACCES
3125 && newname_dev != oldname_dev)
3126 {
3127 /* The implementation of `rename' on Windows does not return
3128 errno = EXDEV when you are moving a directory to a
3129 different storage device (ex. logical disk). It returns
3130 EACCES instead. So here we handle such situations and
3131 return EXDEV. */
3132 DWORD attributes;
3133
3134 if ((attributes = GetFileAttributes (temp)) != -1
3135 && (attributes & FILE_ATTRIBUTE_DIRECTORY))
3136 errno = EXDEV;
3137 }
3138 else if (errno == EEXIST)
3139 {
3140 if (_chmod (newname, 0666) != 0)
3141 return result;
3142 if (_unlink (newname) != 0)
3143 return result;
3144 result = rename (temp, newname);
3145 }
3146 else if (w32err == ERROR_PRIVILEGE_NOT_HELD
3147 && is_symlink (temp))
3148 {
3149 /* This is Windows prohibiting the user from creating a
3150 symlink in another place, since that requires
3151 privileges. */
3152 errno = EPERM;
3153 }
3154 }
3155
3156 return result;
3157 }
3158
3159 int
3160 sys_rmdir (const char * path)
3161 {
3162 return _rmdir (map_w32_filename (path, NULL));
3163 }
3164
3165 int
3166 sys_unlink (const char * path)
3167 {
3168 path = map_w32_filename (path, NULL);
3169
3170 /* On Unix, unlink works without write permission. */
3171 _chmod (path, 0666);
3172 return _unlink (path);
3173 }
3174
3175 static FILETIME utc_base_ft;
3176 static ULONGLONG utc_base; /* In 100ns units */
3177 static int init = 0;
3178
3179 #define FILETIME_TO_U64(result, ft) \
3180 do { \
3181 ULARGE_INTEGER uiTemp; \
3182 uiTemp.LowPart = (ft).dwLowDateTime; \
3183 uiTemp.HighPart = (ft).dwHighDateTime; \
3184 result = uiTemp.QuadPart; \
3185 } while (0)
3186
3187 static void
3188 initialize_utc_base (void)
3189 {
3190 /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
3191 SYSTEMTIME st;
3192
3193 st.wYear = 1970;
3194 st.wMonth = 1;
3195 st.wDay = 1;
3196 st.wHour = 0;
3197 st.wMinute = 0;
3198 st.wSecond = 0;
3199 st.wMilliseconds = 0;
3200
3201 SystemTimeToFileTime (&st, &utc_base_ft);
3202 FILETIME_TO_U64 (utc_base, utc_base_ft);
3203 }
3204
3205 static time_t
3206 convert_time (FILETIME ft)
3207 {
3208 ULONGLONG tmp;
3209
3210 if (!init)
3211 {
3212 initialize_utc_base ();
3213 init = 1;
3214 }
3215
3216 if (CompareFileTime (&ft, &utc_base_ft) < 0)
3217 return 0;
3218
3219 FILETIME_TO_U64 (tmp, ft);
3220 return (time_t) ((tmp - utc_base) / 10000000L);
3221 }
3222
3223 static void
3224 convert_from_time_t (time_t time, FILETIME * pft)
3225 {
3226 ULARGE_INTEGER tmp;
3227
3228 if (!init)
3229 {
3230 initialize_utc_base ();
3231 init = 1;
3232 }
3233
3234 /* time in 100ns units since 1-Jan-1601 */
3235 tmp.QuadPart = (ULONGLONG) time * 10000000L + utc_base;
3236 pft->dwHighDateTime = tmp.HighPart;
3237 pft->dwLowDateTime = tmp.LowPart;
3238 }
3239
3240 #if 0
3241 /* No reason to keep this; faking inode values either by hashing or even
3242 using the file index from GetInformationByHandle, is not perfect and
3243 so by default Emacs doesn't use the inode values on Windows.
3244 Instead, we now determine file-truename correctly (except for
3245 possible drive aliasing etc). */
3246
3247 /* Modified version of "PJW" algorithm (see the "Dragon" compiler book). */
3248 static unsigned
3249 hashval (const unsigned char * str)
3250 {
3251 unsigned h = 0;
3252 while (*str)
3253 {
3254 h = (h << 4) + *str++;
3255 h ^= (h >> 28);
3256 }
3257 return h;
3258 }
3259
3260 /* Return the hash value of the canonical pathname, excluding the
3261 drive/UNC header, to get a hopefully unique inode number. */
3262 static DWORD
3263 generate_inode_val (const char * name)
3264 {
3265 char fullname[ MAX_PATH ];
3266 char * p;
3267 unsigned hash;
3268
3269 /* Get the truly canonical filename, if it exists. (Note: this
3270 doesn't resolve aliasing due to subst commands, or recognize hard
3271 links. */
3272 if (!w32_get_long_filename ((char *)name, fullname, MAX_PATH))
3273 abort ();
3274
3275 parse_root (fullname, &p);
3276 /* Normal W32 filesystems are still case insensitive. */
3277 _strlwr (p);
3278 return hashval (p);
3279 }
3280
3281 #endif
3282
3283 static PSECURITY_DESCRIPTOR
3284 get_file_security_desc_by_handle (HANDLE h)
3285 {
3286 PSECURITY_DESCRIPTOR psd = NULL;
3287 DWORD err;
3288 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3289 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3290
3291 err = get_security_info (h, SE_FILE_OBJECT, si,
3292 NULL, NULL, NULL, NULL, &psd);
3293 if (err != ERROR_SUCCESS)
3294 return NULL;
3295
3296 return psd;
3297 }
3298
3299 static PSECURITY_DESCRIPTOR
3300 get_file_security_desc_by_name (const char *fname)
3301 {
3302 PSECURITY_DESCRIPTOR psd = NULL;
3303 DWORD sd_len, err;
3304 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3305 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3306
3307 if (!get_file_security (fname, si, psd, 0, &sd_len))
3308 {
3309 err = GetLastError ();
3310 if (err != ERROR_INSUFFICIENT_BUFFER)
3311 return NULL;
3312 }
3313
3314 psd = xmalloc (sd_len);
3315 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
3316 {
3317 xfree (psd);
3318 return NULL;
3319 }
3320
3321 return psd;
3322 }
3323
3324 static DWORD
3325 get_rid (PSID sid)
3326 {
3327 unsigned n_subauthorities;
3328
3329 /* Use the last sub-authority value of the RID, the relative
3330 portion of the SID, as user/group ID. */
3331 n_subauthorities = *get_sid_sub_authority_count (sid);
3332 if (n_subauthorities < 1)
3333 return 0; /* the "World" RID */
3334 return *get_sid_sub_authority (sid, n_subauthorities - 1);
3335 }
3336
3337 /* Caching SID and account values for faster lokup. */
3338
3339 #ifdef __GNUC__
3340 # define FLEXIBLE_ARRAY_MEMBER
3341 #else
3342 # define FLEXIBLE_ARRAY_MEMBER 1
3343 #endif
3344
3345 struct w32_id {
3346 unsigned rid;
3347 struct w32_id *next;
3348 char name[GNLEN+1];
3349 unsigned char sid[FLEXIBLE_ARRAY_MEMBER];
3350 };
3351
3352 static struct w32_id *w32_idlist;
3353
3354 static int
3355 w32_cached_id (PSID sid, unsigned *id, char *name)
3356 {
3357 struct w32_id *tail, *found;
3358
3359 for (found = NULL, tail = w32_idlist; tail; tail = tail->next)
3360 {
3361 if (equal_sid ((PSID)tail->sid, sid))
3362 {
3363 found = tail;
3364 break;
3365 }
3366 }
3367 if (found)
3368 {
3369 *id = found->rid;
3370 strcpy (name, found->name);
3371 return 1;
3372 }
3373 else
3374 return 0;
3375 }
3376
3377 static void
3378 w32_add_to_cache (PSID sid, unsigned id, char *name)
3379 {
3380 DWORD sid_len;
3381 struct w32_id *new_entry;
3382
3383 /* We don't want to leave behind stale cache from when Emacs was
3384 dumped. */
3385 if (initialized)
3386 {
3387 sid_len = get_length_sid (sid);
3388 new_entry = xmalloc (offsetof (struct w32_id, sid) + sid_len);
3389 if (new_entry)
3390 {
3391 new_entry->rid = id;
3392 strcpy (new_entry->name, name);
3393 copy_sid (sid_len, (PSID)new_entry->sid, sid);
3394 new_entry->next = w32_idlist;
3395 w32_idlist = new_entry;
3396 }
3397 }
3398 }
3399
3400 #define UID 1
3401 #define GID 2
3402
3403 static int
3404 get_name_and_id (PSECURITY_DESCRIPTOR psd, const char *fname,
3405 unsigned *id, char *nm, int what)
3406 {
3407 PSID sid = NULL;
3408 char machine[MAX_COMPUTERNAME_LENGTH+1];
3409 BOOL dflt;
3410 SID_NAME_USE ignore;
3411 char name[UNLEN+1];
3412 DWORD name_len = sizeof (name);
3413 char domain[1024];
3414 DWORD domain_len = sizeof (domain);
3415 char *mp = NULL;
3416 int use_dflt = 0;
3417 int result;
3418
3419 if (what == UID)
3420 result = get_security_descriptor_owner (psd, &sid, &dflt);
3421 else if (what == GID)
3422 result = get_security_descriptor_group (psd, &sid, &dflt);
3423 else
3424 result = 0;
3425
3426 if (!result || !is_valid_sid (sid))
3427 use_dflt = 1;
3428 else if (!w32_cached_id (sid, id, nm))
3429 {
3430 /* If FNAME is a UNC, we need to lookup account on the
3431 specified machine. */
3432 if (IS_DIRECTORY_SEP (fname[0]) && IS_DIRECTORY_SEP (fname[1])
3433 && fname[2] != '\0')
3434 {
3435 const char *s;
3436 char *p;
3437
3438 for (s = fname + 2, p = machine;
3439 *s && !IS_DIRECTORY_SEP (*s); s++, p++)
3440 *p = *s;
3441 *p = '\0';
3442 mp = machine;
3443 }
3444
3445 if (!lookup_account_sid (mp, sid, name, &name_len,
3446 domain, &domain_len, &ignore)
3447 || name_len > UNLEN+1)
3448 use_dflt = 1;
3449 else
3450 {
3451 *id = get_rid (sid);
3452 strcpy (nm, name);
3453 w32_add_to_cache (sid, *id, name);
3454 }
3455 }
3456 return use_dflt;
3457 }
3458
3459 static void
3460 get_file_owner_and_group (PSECURITY_DESCRIPTOR psd,
3461 const char *fname,
3462 struct stat *st)
3463 {
3464 int dflt_usr = 0, dflt_grp = 0;
3465
3466 if (!psd)
3467 {
3468 dflt_usr = 1;
3469 dflt_grp = 1;
3470 }
3471 else
3472 {
3473 if (get_name_and_id (psd, fname, &st->st_uid, st->st_uname, UID))
3474 dflt_usr = 1;
3475 if (get_name_and_id (psd, fname, &st->st_gid, st->st_gname, GID))
3476 dflt_grp = 1;
3477 }
3478 /* Consider files to belong to current user/group, if we cannot get
3479 more accurate information. */
3480 if (dflt_usr)
3481 {
3482 st->st_uid = dflt_passwd.pw_uid;
3483 strcpy (st->st_uname, dflt_passwd.pw_name);
3484 }
3485 if (dflt_grp)
3486 {
3487 st->st_gid = dflt_passwd.pw_gid;
3488 strcpy (st->st_gname, dflt_group.gr_name);
3489 }
3490 }
3491
3492 /* Return non-zero if NAME is a potentially slow filesystem. */
3493 int
3494 is_slow_fs (const char *name)
3495 {
3496 char drive_root[4];
3497 UINT devtype;
3498
3499 if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
3500 devtype = DRIVE_REMOTE; /* assume UNC name is remote */
3501 else if (!(strlen (name) >= 2 && IS_DEVICE_SEP (name[1])))
3502 devtype = GetDriveType (NULL); /* use root of current drive */
3503 else
3504 {
3505 /* GetDriveType needs the root directory of the drive. */
3506 strncpy (drive_root, name, 2);
3507 drive_root[2] = '\\';
3508 drive_root[3] = '\0';
3509 devtype = GetDriveType (drive_root);
3510 }
3511 return !(devtype == DRIVE_FIXED || devtype == DRIVE_RAMDISK);
3512 }
3513
3514 /* MSVC stat function can't cope with UNC names and has other bugs, so
3515 replace it with our own. This also allows us to calculate consistent
3516 inode values and owner/group without hacks in the main Emacs code. */
3517
3518 static int
3519 stat_worker (const char * path, struct stat * buf, int follow_symlinks)
3520 {
3521 char *name, *save_name, *r;
3522 WIN32_FIND_DATA wfd;
3523 HANDLE fh;
3524 unsigned __int64 fake_inode = 0;
3525 int permission;
3526 int len;
3527 int rootdir = FALSE;
3528 PSECURITY_DESCRIPTOR psd = NULL;
3529 int is_a_symlink = 0;
3530 DWORD file_flags = FILE_FLAG_BACKUP_SEMANTICS;
3531 DWORD access_rights = 0;
3532 DWORD fattrs = 0, serialnum = 0, fs_high = 0, fs_low = 0, nlinks = 1;
3533 FILETIME ctime, atime, wtime;
3534
3535 if (path == NULL || buf == NULL)
3536 {
3537 errno = EFAULT;
3538 return -1;
3539 }
3540
3541 save_name = name = (char *) map_w32_filename (path, &path);
3542 /* Must be valid filename, no wild cards or other invalid
3543 characters. We use _mbspbrk to support multibyte strings that
3544 might look to strpbrk as if they included literal *, ?, and other
3545 characters mentioned below that are disallowed by Windows
3546 filesystems. */
3547 if (_mbspbrk (name, "*?|<>\""))
3548 {
3549 errno = ENOENT;
3550 return -1;
3551 }
3552
3553 /* Remove trailing directory separator, unless name is the root
3554 directory of a drive or UNC volume in which case ensure there
3555 is a trailing separator. */
3556 len = strlen (name);
3557 name = strcpy (alloca (len + 2), name);
3558
3559 /* Avoid a somewhat costly call to is_symlink if the filesystem
3560 doesn't support symlinks. */
3561 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
3562 is_a_symlink = is_symlink (name);
3563
3564 /* Plan A: Open the file and get all the necessary information via
3565 the resulting handle. This solves several issues in one blow:
3566
3567 . retrieves attributes for the target of a symlink, if needed
3568 . gets attributes of root directories and symlinks pointing to
3569 root directories, thus avoiding the need for special-casing
3570 these and detecting them by examining the file-name format
3571 . retrieves more accurate attributes (e.g., non-zero size for
3572 some directories, esp. directories that are junction points)
3573 . correctly resolves "c:/..", "/.." and similar file names
3574 . avoids run-time penalties for 99% of use cases
3575
3576 Plan A is always tried first, unless the user asked not to (but
3577 if the file is a symlink and we need to follow links, we try Plan
3578 A even if the user asked not to).
3579
3580 If Plan A fails, we go to Plan B (below), where various
3581 potentially expensive techniques must be used to handle "special"
3582 files such as UNC volumes etc. */
3583 if (!(NILP (Vw32_get_true_file_attributes)
3584 || (EQ (Vw32_get_true_file_attributes, Qlocal) && is_slow_fs (name)))
3585 /* Following symlinks requires getting the info by handle. */
3586 || (is_a_symlink && follow_symlinks))
3587 {
3588 BY_HANDLE_FILE_INFORMATION info;
3589
3590 if (is_a_symlink && !follow_symlinks)
3591 file_flags |= FILE_FLAG_OPEN_REPARSE_POINT;
3592 /* READ_CONTROL access rights are required to get security info
3593 by handle. But if the OS doesn't support security in the
3594 first place, we don't need to try. */
3595 if (is_windows_9x () != TRUE)
3596 access_rights |= READ_CONTROL;
3597
3598 fh = CreateFile (name, access_rights, 0, NULL, OPEN_EXISTING,
3599 file_flags, NULL);
3600 /* If CreateFile fails with READ_CONTROL, try again with zero as
3601 access rights. */
3602 if (fh == INVALID_HANDLE_VALUE && access_rights)
3603 fh = CreateFile (name, 0, 0, NULL, OPEN_EXISTING,
3604 file_flags, NULL);
3605 if (fh == INVALID_HANDLE_VALUE)
3606 goto no_true_file_attributes;
3607
3608 /* This is more accurate in terms of getting the correct number
3609 of links, but is quite slow (it is noticeable when Emacs is
3610 making a list of file name completions). */
3611 if (GetFileInformationByHandle (fh, &info))
3612 {
3613 nlinks = info.nNumberOfLinks;
3614 /* Might as well use file index to fake inode values, but this
3615 is not guaranteed to be unique unless we keep a handle open
3616 all the time (even then there are situations where it is
3617 not unique). Reputedly, there are at most 48 bits of info
3618 (on NTFS, presumably less on FAT). */
3619 fake_inode = info.nFileIndexHigh;
3620 fake_inode <<= 32;
3621 fake_inode += info.nFileIndexLow;
3622 serialnum = info.dwVolumeSerialNumber;
3623 fs_high = info.nFileSizeHigh;
3624 fs_low = info.nFileSizeLow;
3625 ctime = info.ftCreationTime;
3626 atime = info.ftLastAccessTime;
3627 wtime = info.ftLastWriteTime;
3628 fattrs = info.dwFileAttributes;
3629 }
3630 else
3631 {
3632 /* We don't go to Plan B here, because it's not clear that
3633 it's a good idea. The only known use case where
3634 CreateFile succeeds, but GetFileInformationByHandle fails
3635 (with ERROR_INVALID_FUNCTION) is for character devices
3636 such as NUL, PRN, etc. For these, switching to Plan B is
3637 a net loss, because we lose the character device
3638 attribute returned by GetFileType below (FindFirstFile
3639 doesn't set that bit in the attributes), and the other
3640 fields don't make sense for character devices anyway.
3641 Emacs doesn't really care for non-file entities in the
3642 context of l?stat, so neither do we. */
3643
3644 /* w32err is assigned so one could put a breakpoint here and
3645 examine its value, when GetFileInformationByHandle
3646 fails. */
3647 DWORD w32err = GetLastError ();
3648
3649 switch (w32err)
3650 {
3651 case ERROR_FILE_NOT_FOUND: /* can this ever happen? */
3652 errno = ENOENT;
3653 return -1;
3654 }
3655 }
3656
3657 /* Test for a symlink before testing for a directory, since
3658 symlinks to directories have the directory bit set, but we
3659 don't want them to appear as directories. */
3660 if (is_a_symlink && !follow_symlinks)
3661 buf->st_mode = S_IFLNK;
3662 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3663 buf->st_mode = S_IFDIR;
3664 else
3665 {
3666 DWORD ftype = GetFileType (fh);
3667
3668 switch (ftype)
3669 {
3670 case FILE_TYPE_DISK:
3671 buf->st_mode = S_IFREG;
3672 break;
3673 case FILE_TYPE_PIPE:
3674 buf->st_mode = S_IFIFO;
3675 break;
3676 case FILE_TYPE_CHAR:
3677 case FILE_TYPE_UNKNOWN:
3678 default:
3679 buf->st_mode = S_IFCHR;
3680 }
3681 }
3682 /* We produce the fallback owner and group data, based on the
3683 current user that runs Emacs, in the following cases:
3684
3685 . this is Windows 9X
3686 . getting security by handle failed, and we need to produce
3687 information for the target of a symlink (this is better
3688 than producing a potentially misleading info about the
3689 symlink itself)
3690
3691 If getting security by handle fails, and we don't need to
3692 resolve symlinks, we try getting security by name. */
3693 if (is_windows_9x () != TRUE)
3694 psd = get_file_security_desc_by_handle (fh);
3695 if (psd)
3696 {
3697 get_file_owner_and_group (psd, name, buf);
3698 LocalFree (psd);
3699 }
3700 else if (is_windows_9x () == TRUE)
3701 get_file_owner_and_group (NULL, name, buf);
3702 else if (!(is_a_symlink && follow_symlinks))
3703 {
3704 psd = get_file_security_desc_by_name (name);
3705 get_file_owner_and_group (psd, name, buf);
3706 xfree (psd);
3707 }
3708 else
3709 get_file_owner_and_group (NULL, name, buf);
3710 CloseHandle (fh);
3711 }
3712 else
3713 {
3714 no_true_file_attributes:
3715 /* Plan B: Either getting a handle on the file failed, or the
3716 caller explicitly asked us to not bother making this
3717 information more accurate.
3718
3719 Implementation note: In Plan B, we never bother to resolve
3720 symlinks, even if we got here because we tried Plan A and
3721 failed. That's because, even if the caller asked for extra
3722 precision by setting Vw32_get_true_file_attributes to t,
3723 resolving symlinks requires acquiring a file handle to the
3724 symlink, which we already know will fail. And if the user
3725 did not ask for extra precision, resolving symlinks will fly
3726 in the face of that request, since the user then wants the
3727 lightweight version of the code. */
3728 rootdir = (path >= save_name + len - 1
3729 && (IS_DIRECTORY_SEP (*path) || *path == 0));
3730
3731 /* If name is "c:/.." or "/.." then stat "c:/" or "/". */
3732 r = IS_DEVICE_SEP (name[1]) ? &name[2] : name;
3733 if (IS_DIRECTORY_SEP (r[0])
3734 && r[1] == '.' && r[2] == '.' && r[3] == '\0')
3735 r[1] = r[2] = '\0';
3736
3737 /* Note: If NAME is a symlink to the root of a UNC volume
3738 (i.e. "\\SERVER"), we will not detect that here, and we will
3739 return data about the symlink as result of FindFirst below.
3740 This is unfortunate, but that marginal use case does not
3741 justify a call to chase_symlinks which would impose a penalty
3742 on all the other use cases. (We get here for symlinks to
3743 roots of UNC volumes because CreateFile above fails for them,
3744 unlike with symlinks to root directories X:\ of drives.) */
3745 if (is_unc_volume (name))
3746 {
3747 fattrs = unc_volume_file_attributes (name);
3748 if (fattrs == -1)
3749 return -1;
3750
3751 ctime = atime = wtime = utc_base_ft;
3752 }
3753 else if (rootdir)
3754 {
3755 if (!IS_DIRECTORY_SEP (name[len-1]))
3756 strcat (name, "\\");
3757 if (GetDriveType (name) < 2)
3758 {
3759 errno = ENOENT;
3760 return -1;
3761 }
3762
3763 fattrs = FILE_ATTRIBUTE_DIRECTORY;
3764 ctime = atime = wtime = utc_base_ft;
3765 }
3766 else
3767 {
3768 if (IS_DIRECTORY_SEP (name[len-1]))
3769 name[len - 1] = 0;
3770
3771 /* (This is hacky, but helps when doing file completions on
3772 network drives.) Optimize by using information available from
3773 active readdir if possible. */
3774 len = strlen (dir_pathname);
3775 if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
3776 len--;
3777 if (dir_find_handle != INVALID_HANDLE_VALUE
3778 && !(is_a_symlink && follow_symlinks)
3779 && strnicmp (save_name, dir_pathname, len) == 0
3780 && IS_DIRECTORY_SEP (name[len])
3781 && xstrcasecmp (name + len + 1, dir_static.d_name) == 0)
3782 {
3783 /* This was the last entry returned by readdir. */
3784 wfd = dir_find_data;
3785 }
3786 else
3787 {
3788 logon_network_drive (name);
3789
3790 fh = FindFirstFile (name, &wfd);
3791 if (fh == INVALID_HANDLE_VALUE)
3792 {
3793 errno = ENOENT;
3794 return -1;
3795 }
3796 FindClose (fh);
3797 }
3798 /* Note: if NAME is a symlink, the information we get from
3799 FindFirstFile is for the symlink, not its target. */
3800 fattrs = wfd.dwFileAttributes;
3801 ctime = wfd.ftCreationTime;
3802 atime = wfd.ftLastAccessTime;
3803 wtime = wfd.ftLastWriteTime;
3804 fs_high = wfd.nFileSizeHigh;
3805 fs_low = wfd.nFileSizeLow;
3806 fake_inode = 0;
3807 nlinks = 1;
3808 serialnum = volume_info.serialnum;
3809 }
3810 if (is_a_symlink && !follow_symlinks)
3811 buf->st_mode = S_IFLNK;
3812 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3813 buf->st_mode = S_IFDIR;
3814 else
3815 buf->st_mode = S_IFREG;
3816
3817 get_file_owner_and_group (NULL, name, buf);
3818 }
3819
3820 #if 0
3821 /* Not sure if there is any point in this. */
3822 if (!NILP (Vw32_generate_fake_inodes))
3823 fake_inode = generate_inode_val (name);
3824 else if (fake_inode == 0)
3825 {
3826 /* For want of something better, try to make everything unique. */
3827 static DWORD gen_num = 0;
3828 fake_inode = ++gen_num;
3829 }
3830 #endif
3831
3832 buf->st_ino = fake_inode;
3833
3834 buf->st_dev = serialnum;
3835 buf->st_rdev = serialnum;
3836
3837 buf->st_size = fs_high;
3838 buf->st_size <<= 32;
3839 buf->st_size += fs_low;
3840 buf->st_nlink = nlinks;
3841
3842 /* Convert timestamps to Unix format. */
3843 buf->st_mtime = convert_time (wtime);
3844 buf->st_atime = convert_time (atime);
3845 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
3846 buf->st_ctime = convert_time (ctime);
3847 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
3848
3849 /* determine rwx permissions */
3850 if (is_a_symlink && !follow_symlinks)
3851 permission = S_IREAD | S_IWRITE | S_IEXEC; /* Posix expectations */
3852 else
3853 {
3854 if (fattrs & FILE_ATTRIBUTE_READONLY)
3855 permission = S_IREAD;
3856 else
3857 permission = S_IREAD | S_IWRITE;
3858
3859 if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3860 permission |= S_IEXEC;
3861 else if (is_exec (name))
3862 permission |= S_IEXEC;
3863 }
3864
3865 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
3866
3867 return 0;
3868 }
3869
3870 int
3871 stat (const char * path, struct stat * buf)
3872 {
3873 return stat_worker (path, buf, 1);
3874 }
3875
3876 int
3877 lstat (const char * path, struct stat * buf)
3878 {
3879 return stat_worker (path, buf, 0);
3880 }
3881
3882 /* Provide fstat and utime as well as stat for consistent handling of
3883 file timestamps. */
3884 int
3885 fstat (int desc, struct stat * buf)
3886 {
3887 HANDLE fh = (HANDLE) _get_osfhandle (desc);
3888 BY_HANDLE_FILE_INFORMATION info;
3889 unsigned __int64 fake_inode;
3890 int permission;
3891
3892 switch (GetFileType (fh) & ~FILE_TYPE_REMOTE)
3893 {
3894 case FILE_TYPE_DISK:
3895 buf->st_mode = S_IFREG;
3896 if (!GetFileInformationByHandle (fh, &info))
3897 {
3898 errno = EACCES;
3899 return -1;
3900 }
3901 break;
3902 case FILE_TYPE_PIPE:
3903 buf->st_mode = S_IFIFO;
3904 goto non_disk;
3905 case FILE_TYPE_CHAR:
3906 case FILE_TYPE_UNKNOWN:
3907 default:
3908 buf->st_mode = S_IFCHR;
3909 non_disk:
3910 memset (&info, 0, sizeof (info));
3911 info.dwFileAttributes = 0;
3912 info.ftCreationTime = utc_base_ft;
3913 info.ftLastAccessTime = utc_base_ft;
3914 info.ftLastWriteTime = utc_base_ft;
3915 }
3916
3917 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
3918 buf->st_mode = S_IFDIR;
3919
3920 buf->st_nlink = info.nNumberOfLinks;
3921 /* Might as well use file index to fake inode values, but this
3922 is not guaranteed to be unique unless we keep a handle open
3923 all the time (even then there are situations where it is
3924 not unique). Reputedly, there are at most 48 bits of info
3925 (on NTFS, presumably less on FAT). */
3926 fake_inode = info.nFileIndexHigh;
3927 fake_inode <<= 32;
3928 fake_inode += info.nFileIndexLow;
3929
3930 /* MSVC defines _ino_t to be short; other libc's might not. */
3931 if (sizeof (buf->st_ino) == 2)
3932 buf->st_ino = fake_inode ^ (fake_inode >> 16);
3933 else
3934 buf->st_ino = fake_inode;
3935
3936 /* Consider files to belong to current user.
3937 FIXME: this should use GetSecurityInfo API, but it is only
3938 available for _WIN32_WINNT >= 0x501. */
3939 buf->st_uid = dflt_passwd.pw_uid;
3940 buf->st_gid = dflt_passwd.pw_gid;
3941 strcpy (buf->st_uname, dflt_passwd.pw_name);
3942 strcpy (buf->st_gname, dflt_group.gr_name);
3943
3944 buf->st_dev = info.dwVolumeSerialNumber;
3945 buf->st_rdev = info.dwVolumeSerialNumber;
3946
3947 buf->st_size = info.nFileSizeHigh;
3948 buf->st_size <<= 32;
3949 buf->st_size += info.nFileSizeLow;
3950
3951 /* Convert timestamps to Unix format. */
3952 buf->st_mtime = convert_time (info.ftLastWriteTime);
3953 buf->st_atime = convert_time (info.ftLastAccessTime);
3954 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
3955 buf->st_ctime = convert_time (info.ftCreationTime);
3956 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
3957
3958 /* determine rwx permissions */
3959 if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
3960 permission = S_IREAD;
3961 else
3962 permission = S_IREAD | S_IWRITE;
3963
3964 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
3965 permission |= S_IEXEC;
3966 else
3967 {
3968 #if 0 /* no way of knowing the filename */
3969 char * p = strrchr (name, '.');
3970 if (p != NULL &&
3971 (xstrcasecmp (p, ".exe") == 0 ||
3972 xstrcasecmp (p, ".com") == 0 ||
3973 xstrcasecmp (p, ".bat") == 0 ||
3974 xstrcasecmp (p, ".cmd") == 0))
3975 permission |= S_IEXEC;
3976 #endif
3977 }
3978
3979 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
3980
3981 return 0;
3982 }
3983
3984 int
3985 utime (const char *name, struct utimbuf *times)
3986 {
3987 struct utimbuf deftime;
3988 HANDLE fh;
3989 FILETIME mtime;
3990 FILETIME atime;
3991
3992 if (times == NULL)
3993 {
3994 deftime.modtime = deftime.actime = time (NULL);
3995 times = &deftime;
3996 }
3997
3998 /* Need write access to set times. */
3999 fh = CreateFile (name, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
4000 0, OPEN_EXISTING, 0, NULL);
4001 if (fh)
4002 {
4003 convert_from_time_t (times->actime, &atime);
4004 convert_from_time_t (times->modtime, &mtime);
4005 if (!SetFileTime (fh, NULL, &atime, &mtime))
4006 {
4007 CloseHandle (fh);
4008 errno = EACCES;
4009 return -1;
4010 }
4011 CloseHandle (fh);
4012 }
4013 else
4014 {
4015 errno = EINVAL;
4016 return -1;
4017 }
4018 return 0;
4019 }
4020
4021 \f
4022 /* Symlink-related functions. */
4023 #ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
4024 #define SYMBOLIC_LINK_FLAG_DIRECTORY 0x1
4025 #endif
4026
4027 int
4028 symlink (char const *filename, char const *linkname)
4029 {
4030 char linkfn[MAX_PATH], *tgtfn;
4031 DWORD flags = 0;
4032 int dir_access, filename_ends_in_slash;
4033
4034 /* Diagnostics follows Posix as much as possible. */
4035 if (filename == NULL || linkname == NULL)
4036 {
4037 errno = EFAULT;
4038 return -1;
4039 }
4040 if (!*filename)
4041 {
4042 errno = ENOENT;
4043 return -1;
4044 }
4045 if (strlen (filename) > MAX_PATH || strlen (linkname) > MAX_PATH)
4046 {
4047 errno = ENAMETOOLONG;
4048 return -1;
4049 }
4050
4051 strcpy (linkfn, map_w32_filename (linkname, NULL));
4052 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0)
4053 {
4054 errno = EPERM;
4055 return -1;
4056 }
4057
4058 /* Note: since empty FILENAME was already rejected, we can safely
4059 refer to FILENAME[1]. */
4060 if (!(IS_DIRECTORY_SEP (filename[0]) || IS_DEVICE_SEP (filename[1])))
4061 {
4062 /* Non-absolute FILENAME is understood as being relative to
4063 LINKNAME's directory. We need to prepend that directory to
4064 FILENAME to get correct results from sys_access below, since
4065 otherwise it will interpret FILENAME relative to the
4066 directory where the Emacs process runs. Note that
4067 make-symbolic-link always makes sure LINKNAME is a fully
4068 expanded file name. */
4069 char tem[MAX_PATH];
4070 char *p = linkfn + strlen (linkfn);
4071
4072 while (p > linkfn && !IS_ANY_SEP (p[-1]))
4073 p--;
4074 if (p > linkfn)
4075 strncpy (tem, linkfn, p - linkfn);
4076 tem[p - linkfn] = '\0';
4077 strcat (tem, filename);
4078 dir_access = sys_access (tem, D_OK);
4079 }
4080 else
4081 dir_access = sys_access (filename, D_OK);
4082
4083 /* Since Windows distinguishes between symlinks to directories and
4084 to files, we provide a kludgy feature: if FILENAME doesn't
4085 exist, but ends in a slash, we create a symlink to directory. If
4086 FILENAME exists and is a directory, we always create a symlink to
4087 directory. */
4088 filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
4089 if (dir_access == 0 || filename_ends_in_slash)
4090 flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
4091
4092 tgtfn = (char *)map_w32_filename (filename, NULL);
4093 if (filename_ends_in_slash)
4094 tgtfn[strlen (tgtfn) - 1] = '\0';
4095
4096 errno = 0;
4097 if (!create_symbolic_link (linkfn, tgtfn, flags))
4098 {
4099 /* ENOSYS is set by create_symbolic_link, when it detects that
4100 the OS doesn't support the CreateSymbolicLink API. */
4101 if (errno != ENOSYS)
4102 {
4103 DWORD w32err = GetLastError ();
4104
4105 switch (w32err)
4106 {
4107 /* ERROR_SUCCESS is sometimes returned when LINKFN and
4108 TGTFN point to the same file name, go figure. */
4109 case ERROR_SUCCESS:
4110 case ERROR_FILE_EXISTS:
4111 errno = EEXIST;
4112 break;
4113 case ERROR_ACCESS_DENIED:
4114 errno = EACCES;
4115 break;
4116 case ERROR_FILE_NOT_FOUND:
4117 case ERROR_PATH_NOT_FOUND:
4118 case ERROR_BAD_NETPATH:
4119 case ERROR_INVALID_REPARSE_DATA:
4120 errno = ENOENT;
4121 break;
4122 case ERROR_DIRECTORY:
4123 errno = EISDIR;
4124 break;
4125 case ERROR_PRIVILEGE_NOT_HELD:
4126 case ERROR_NOT_ALL_ASSIGNED:
4127 errno = EPERM;
4128 break;
4129 case ERROR_DISK_FULL:
4130 errno = ENOSPC;
4131 break;
4132 default:
4133 errno = EINVAL;
4134 break;
4135 }
4136 }
4137 return -1;
4138 }
4139 return 0;
4140 }
4141
4142 /* A quick inexpensive test of whether FILENAME identifies a file that
4143 is a symlink. Returns non-zero if it is, zero otherwise. FILENAME
4144 must already be in the normalized form returned by
4145 map_w32_filename.
4146
4147 Note: for repeated operations on many files, it is best to test
4148 whether the underlying volume actually supports symlinks, by
4149 testing the FILE_SUPPORTS_REPARSE_POINTS bit in volume's flags, and
4150 avoid the call to this function if it doesn't. That's because the
4151 call to GetFileAttributes takes a non-negligible time, especially
4152 on non-local or removable filesystems. See stat_worker for an
4153 example of how to do that. */
4154 static int
4155 is_symlink (const char *filename)
4156 {
4157 DWORD attrs;
4158 WIN32_FIND_DATA wfd;
4159 HANDLE fh;
4160
4161 attrs = GetFileAttributes (filename);
4162 if (attrs == -1)
4163 {
4164 DWORD w32err = GetLastError ();
4165
4166 switch (w32err)
4167 {
4168 case ERROR_BAD_NETPATH: /* network share, can't be a symlink */
4169 break;
4170 case ERROR_ACCESS_DENIED:
4171 errno = EACCES;
4172 break;
4173 case ERROR_FILE_NOT_FOUND:
4174 case ERROR_PATH_NOT_FOUND:
4175 default:
4176 errno = ENOENT;
4177 break;
4178 }
4179 return 0;
4180 }
4181 if ((attrs & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
4182 return 0;
4183 logon_network_drive (filename);
4184 fh = FindFirstFile (filename, &wfd);
4185 if (fh == INVALID_HANDLE_VALUE)
4186 return 0;
4187 FindClose (fh);
4188 return (wfd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0
4189 && (wfd.dwReserved0 & IO_REPARSE_TAG_SYMLINK) == IO_REPARSE_TAG_SYMLINK;
4190 }
4191
4192 /* If NAME identifies a symbolic link, copy into BUF the file name of
4193 the symlink's target. Copy at most BUF_SIZE bytes, and do NOT
4194 null-terminate the target name, even if it fits. Return the number
4195 of bytes copied, or -1 if NAME is not a symlink or any error was
4196 encountered while resolving it. The file name copied into BUF is
4197 encoded in the current ANSI codepage. */
4198 ssize_t
4199 readlink (const char *name, char *buf, size_t buf_size)
4200 {
4201 const char *path;
4202 TOKEN_PRIVILEGES privs;
4203 int restore_privs = 0;
4204 HANDLE sh;
4205 ssize_t retval;
4206
4207 if (name == NULL)
4208 {
4209 errno = EFAULT;
4210 return -1;
4211 }
4212 if (!*name)
4213 {
4214 errno = ENOENT;
4215 return -1;
4216 }
4217
4218 path = map_w32_filename (name, NULL);
4219
4220 if (strlen (path) > MAX_PATH)
4221 {
4222 errno = ENAMETOOLONG;
4223 return -1;
4224 }
4225
4226 errno = 0;
4227 if (is_windows_9x () == TRUE
4228 || (volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0
4229 || !is_symlink (path))
4230 {
4231 if (!errno)
4232 errno = EINVAL; /* not a symlink */
4233 return -1;
4234 }
4235
4236 /* Done with simple tests, now we're in for some _real_ work. */
4237 if (enable_privilege (SE_BACKUP_NAME, TRUE, &privs))
4238 restore_privs = 1;
4239 /* Implementation note: From here and onward, don't return early,
4240 since that will fail to restore the original set of privileges of
4241 the calling thread. */
4242
4243 retval = -1; /* not too optimistic, are we? */
4244
4245 /* Note: In the next call to CreateFile, we use zero as the 2nd
4246 argument because, when the symlink is a hidden/system file,
4247 e.g. 'C:\Users\All Users', GENERIC_READ fails with
4248 ERROR_ACCESS_DENIED. Zero seems to work just fine, both for file
4249 and directory symlinks. */
4250 sh = CreateFile (path, 0, 0, NULL, OPEN_EXISTING,
4251 FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
4252 NULL);
4253 if (sh != INVALID_HANDLE_VALUE)
4254 {
4255 BYTE reparse_buf[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
4256 REPARSE_DATA_BUFFER *reparse_data = (REPARSE_DATA_BUFFER *)&reparse_buf[0];
4257 DWORD retbytes;
4258
4259 if (!DeviceIoControl (sh, FSCTL_GET_REPARSE_POINT, NULL, 0,
4260 reparse_buf, MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
4261 &retbytes, NULL))
4262 errno = EIO;
4263 else if (reparse_data->ReparseTag != IO_REPARSE_TAG_SYMLINK)
4264 errno = EINVAL;
4265 else
4266 {
4267 /* Copy the link target name, in wide characters, fro
4268 reparse_data, then convert it to multibyte encoding in
4269 the current locale's codepage. */
4270 WCHAR *lwname;
4271 BYTE lname[MAX_PATH];
4272 USHORT lname_len;
4273 USHORT lwname_len =
4274 reparse_data->SymbolicLinkReparseBuffer.PrintNameLength;
4275 WCHAR *lwname_src =
4276 reparse_data->SymbolicLinkReparseBuffer.PathBuffer
4277 + reparse_data->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR);
4278
4279 /* According to MSDN, PrintNameLength does not include the
4280 terminating null character. */
4281 lwname = alloca ((lwname_len + 1) * sizeof(WCHAR));
4282 memcpy (lwname, lwname_src, lwname_len);
4283 lwname[lwname_len/sizeof(WCHAR)] = 0; /* null-terminate */
4284
4285 /* FIXME: Should we use the current file-name coding system
4286 instead of the fixed value of the ANSI codepage? */
4287 lname_len = WideCharToMultiByte (w32_ansi_code_page, 0, lwname, -1,
4288 lname, MAX_PATH, NULL, NULL);
4289 if (!lname_len)
4290 {
4291 /* WideCharToMultiByte failed. */
4292 DWORD w32err1 = GetLastError ();
4293
4294 switch (w32err1)
4295 {
4296 case ERROR_INSUFFICIENT_BUFFER:
4297 errno = ENAMETOOLONG;
4298 break;
4299 case ERROR_INVALID_PARAMETER:
4300 errno = EFAULT;
4301 break;
4302 case ERROR_NO_UNICODE_TRANSLATION:
4303 errno = ENOENT;
4304 break;
4305 default:
4306 errno = EINVAL;
4307 break;
4308 }
4309 }
4310 else
4311 {
4312 size_t size_to_copy = buf_size;
4313 BYTE *p = lname;
4314 BYTE *pend = p + lname_len;
4315
4316 /* Normalize like dostounix_filename does, but we don't
4317 want to assume that lname is null-terminated. */
4318 if (*p && p[1] == ':' && *p >= 'A' && *p <= 'Z')
4319 *p += 'a' - 'A';
4320 while (p <= pend)
4321 {
4322 if (*p == '\\')
4323 *p = '/';
4324 ++p;
4325 }
4326 /* Testing for null-terminated LNAME is paranoia:
4327 WideCharToMultiByte should always return a
4328 null-terminated string when its 4th argument is -1
4329 and its 3rd argument is null-terminated (which they
4330 are, see above). */
4331 if (lname[lname_len - 1] == '\0')
4332 lname_len--;
4333 if (lname_len <= buf_size)
4334 size_to_copy = lname_len;
4335 strncpy (buf, lname, size_to_copy);
4336 /* Success! */
4337 retval = size_to_copy;
4338 }
4339 }
4340 CloseHandle (sh);
4341 }
4342 else
4343 {
4344 /* CreateFile failed. */
4345 DWORD w32err2 = GetLastError ();
4346
4347 switch (w32err2)
4348 {
4349 case ERROR_FILE_NOT_FOUND:
4350 case ERROR_PATH_NOT_FOUND:
4351 errno = ENOENT;
4352 break;
4353 case ERROR_ACCESS_DENIED:
4354 case ERROR_TOO_MANY_OPEN_FILES:
4355 errno = EACCES;
4356 break;
4357 default:
4358 errno = EPERM;
4359 break;
4360 }
4361 }
4362 if (restore_privs)
4363 {
4364 restore_privilege (&privs);
4365 revert_to_self ();
4366 }
4367
4368 return retval;
4369 }
4370
4371 /* If FILE is a symlink, return its target (stored in a static
4372 buffer); otherwise return FILE.
4373
4374 This function repeatedly resolves symlinks in the last component of
4375 a chain of symlink file names, as in foo -> bar -> baz -> ...,
4376 until it arrives at a file whose last component is not a symlink,
4377 or some error occurs. It returns the target of the last
4378 successfully resolved symlink in the chain. If it succeeds to
4379 resolve even a single symlink, the value returned is an absolute
4380 file name with backslashes (result of GetFullPathName). By
4381 contrast, if the original FILE is returned, it is unaltered.
4382
4383 Note: This function can set errno even if it succeeds.
4384
4385 Implementation note: we only resolve the last portion ("basename")
4386 of the argument FILE and of each following file in the chain,
4387 disregarding any possible symlinks in its leading directories.
4388 This is because Windows system calls and library functions
4389 transparently resolve symlinks in leading directories and return
4390 correct information, as long as the basename is not a symlink. */
4391 static char *
4392 chase_symlinks (const char *file)
4393 {
4394 static char target[MAX_PATH];
4395 char link[MAX_PATH];
4396 ssize_t res, link_len;
4397 int loop_count = 0;
4398
4399 if (is_windows_9x () == TRUE || !is_symlink (file))
4400 return (char *)file;
4401
4402 if ((link_len = GetFullPathName (file, MAX_PATH, link, NULL)) == 0)
4403 return (char *)file;
4404
4405 target[0] = '\0';
4406 do {
4407
4408 /* Remove trailing slashes, as we want to resolve the last
4409 non-trivial part of the link name. */
4410 while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
4411 link[link_len--] = '\0';
4412
4413 res = readlink (link, target, MAX_PATH);
4414 if (res > 0)
4415 {
4416 target[res] = '\0';
4417 if (!(IS_DEVICE_SEP (target[1])
4418 || (IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))))
4419 {
4420 /* Target is relative. Append it to the directory part of
4421 the symlink, then copy the result back to target. */
4422 char *p = link + link_len;
4423
4424 while (p > link && !IS_ANY_SEP (p[-1]))
4425 p--;
4426 strcpy (p, target);
4427 strcpy (target, link);
4428 }
4429 /* Resolve any "." and ".." to get a fully-qualified file name
4430 in link[] again. */
4431 link_len = GetFullPathName (target, MAX_PATH, link, NULL);
4432 }
4433 } while (res > 0 && link_len > 0 && ++loop_count <= 100);
4434
4435 if (loop_count > 100)
4436 errno = ELOOP;
4437
4438 if (target[0] == '\0') /* not a single call to readlink succeeded */
4439 return (char *)file;
4440 return target;
4441 }
4442
4443 /* MS-Windows version of careadlinkat (cf. ../lib/careadlinkat.c). We
4444 have a fixed max size for file names, so we don't need the kind of
4445 alloc/malloc/realloc dance the gnulib version does. We also don't
4446 support FD-relative symlinks. */
4447 char *
4448 careadlinkat (int fd, char const *filename,
4449 char *buffer, size_t buffer_size,
4450 struct allocator const *alloc,
4451 ssize_t (*preadlinkat) (int, char const *, char *, size_t))
4452 {
4453 char linkname[MAX_PATH];
4454 ssize_t link_size;
4455
4456 if (fd != AT_FDCWD)
4457 {
4458 errno = EINVAL;
4459 return NULL;
4460 }
4461
4462 link_size = preadlinkat (fd, filename, linkname, sizeof(linkname));
4463
4464 if (link_size > 0)
4465 {
4466 char *retval = buffer;
4467
4468 linkname[link_size++] = '\0';
4469 if (link_size > buffer_size)
4470 retval = (char *)(alloc ? alloc->allocate : xmalloc) (link_size);
4471 if (retval)
4472 memcpy (retval, linkname, link_size);
4473
4474 return retval;
4475 }
4476 return NULL;
4477 }
4478
4479 ssize_t
4480 careadlinkatcwd (int fd, char const *filename, char *buffer,
4481 size_t buffer_size)
4482 {
4483 (void) fd;
4484 return readlink (filename, buffer, buffer_size);
4485 }
4486
4487 \f
4488 /* Support for browsing other processes and their attributes. See
4489 process.c for the Lisp bindings. */
4490
4491 /* Helper wrapper functions. */
4492
4493 static HANDLE WINAPI
4494 create_toolhelp32_snapshot (DWORD Flags, DWORD Ignored)
4495 {
4496 static CreateToolhelp32Snapshot_Proc s_pfn_Create_Toolhelp32_Snapshot = NULL;
4497
4498 if (g_b_init_create_toolhelp32_snapshot == 0)
4499 {
4500 g_b_init_create_toolhelp32_snapshot = 1;
4501 s_pfn_Create_Toolhelp32_Snapshot = (CreateToolhelp32Snapshot_Proc)
4502 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4503 "CreateToolhelp32Snapshot");
4504 }
4505 if (s_pfn_Create_Toolhelp32_Snapshot == NULL)
4506 {
4507 return INVALID_HANDLE_VALUE;
4508 }
4509 return (s_pfn_Create_Toolhelp32_Snapshot (Flags, Ignored));
4510 }
4511
4512 static BOOL WINAPI
4513 process32_first (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
4514 {
4515 static Process32First_Proc s_pfn_Process32_First = NULL;
4516
4517 if (g_b_init_process32_first == 0)
4518 {
4519 g_b_init_process32_first = 1;
4520 s_pfn_Process32_First = (Process32First_Proc)
4521 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4522 "Process32First");
4523 }
4524 if (s_pfn_Process32_First == NULL)
4525 {
4526 return FALSE;
4527 }
4528 return (s_pfn_Process32_First (hSnapshot, lppe));
4529 }
4530
4531 static BOOL WINAPI
4532 process32_next (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
4533 {
4534 static Process32Next_Proc s_pfn_Process32_Next = NULL;
4535
4536 if (g_b_init_process32_next == 0)
4537 {
4538 g_b_init_process32_next = 1;
4539 s_pfn_Process32_Next = (Process32Next_Proc)
4540 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4541 "Process32Next");
4542 }
4543 if (s_pfn_Process32_Next == NULL)
4544 {
4545 return FALSE;
4546 }
4547 return (s_pfn_Process32_Next (hSnapshot, lppe));
4548 }
4549
4550 static BOOL WINAPI
4551 open_thread_token (HANDLE ThreadHandle,
4552 DWORD DesiredAccess,
4553 BOOL OpenAsSelf,
4554 PHANDLE TokenHandle)
4555 {
4556 static OpenThreadToken_Proc s_pfn_Open_Thread_Token = NULL;
4557 HMODULE hm_advapi32 = NULL;
4558 if (is_windows_9x () == TRUE)
4559 {
4560 SetLastError (ERROR_NOT_SUPPORTED);
4561 return FALSE;
4562 }
4563 if (g_b_init_open_thread_token == 0)
4564 {
4565 g_b_init_open_thread_token = 1;
4566 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4567 s_pfn_Open_Thread_Token =
4568 (OpenThreadToken_Proc) GetProcAddress (hm_advapi32, "OpenThreadToken");
4569 }
4570 if (s_pfn_Open_Thread_Token == NULL)
4571 {
4572 SetLastError (ERROR_NOT_SUPPORTED);
4573 return FALSE;
4574 }
4575 return (
4576 s_pfn_Open_Thread_Token (
4577 ThreadHandle,
4578 DesiredAccess,
4579 OpenAsSelf,
4580 TokenHandle)
4581 );
4582 }
4583
4584 static BOOL WINAPI
4585 impersonate_self (SECURITY_IMPERSONATION_LEVEL ImpersonationLevel)
4586 {
4587 static ImpersonateSelf_Proc s_pfn_Impersonate_Self = NULL;
4588 HMODULE hm_advapi32 = NULL;
4589 if (is_windows_9x () == TRUE)
4590 {
4591 return FALSE;
4592 }
4593 if (g_b_init_impersonate_self == 0)
4594 {
4595 g_b_init_impersonate_self = 1;
4596 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4597 s_pfn_Impersonate_Self =
4598 (ImpersonateSelf_Proc) GetProcAddress (hm_advapi32, "ImpersonateSelf");
4599 }
4600 if (s_pfn_Impersonate_Self == NULL)
4601 {
4602 return FALSE;
4603 }
4604 return s_pfn_Impersonate_Self (ImpersonationLevel);
4605 }
4606
4607 static BOOL WINAPI
4608 revert_to_self (void)
4609 {
4610 static RevertToSelf_Proc s_pfn_Revert_To_Self = NULL;
4611 HMODULE hm_advapi32 = NULL;
4612 if (is_windows_9x () == TRUE)
4613 {
4614 return FALSE;
4615 }
4616 if (g_b_init_revert_to_self == 0)
4617 {
4618 g_b_init_revert_to_self = 1;
4619 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4620 s_pfn_Revert_To_Self =
4621 (RevertToSelf_Proc) GetProcAddress (hm_advapi32, "RevertToSelf");
4622 }
4623 if (s_pfn_Revert_To_Self == NULL)
4624 {
4625 return FALSE;
4626 }
4627 return s_pfn_Revert_To_Self ();
4628 }
4629
4630 static BOOL WINAPI
4631 get_process_memory_info (HANDLE h_proc,
4632 PPROCESS_MEMORY_COUNTERS mem_counters,
4633 DWORD bufsize)
4634 {
4635 static GetProcessMemoryInfo_Proc s_pfn_Get_Process_Memory_Info = NULL;
4636 HMODULE hm_psapi = NULL;
4637 if (is_windows_9x () == TRUE)
4638 {
4639 return FALSE;
4640 }
4641 if (g_b_init_get_process_memory_info == 0)
4642 {
4643 g_b_init_get_process_memory_info = 1;
4644 hm_psapi = LoadLibrary ("Psapi.dll");
4645 if (hm_psapi)
4646 s_pfn_Get_Process_Memory_Info = (GetProcessMemoryInfo_Proc)
4647 GetProcAddress (hm_psapi, "GetProcessMemoryInfo");
4648 }
4649 if (s_pfn_Get_Process_Memory_Info == NULL)
4650 {
4651 return FALSE;
4652 }
4653 return s_pfn_Get_Process_Memory_Info (h_proc, mem_counters, bufsize);
4654 }
4655
4656 static BOOL WINAPI
4657 get_process_working_set_size (HANDLE h_proc,
4658 DWORD *minrss,
4659 DWORD *maxrss)
4660 {
4661 static GetProcessWorkingSetSize_Proc
4662 s_pfn_Get_Process_Working_Set_Size = NULL;
4663
4664 if (is_windows_9x () == TRUE)
4665 {
4666 return FALSE;
4667 }
4668 if (g_b_init_get_process_working_set_size == 0)
4669 {
4670 g_b_init_get_process_working_set_size = 1;
4671 s_pfn_Get_Process_Working_Set_Size = (GetProcessWorkingSetSize_Proc)
4672 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4673 "GetProcessWorkingSetSize");
4674 }
4675 if (s_pfn_Get_Process_Working_Set_Size == NULL)
4676 {
4677 return FALSE;
4678 }
4679 return s_pfn_Get_Process_Working_Set_Size (h_proc, minrss, maxrss);
4680 }
4681
4682 static BOOL WINAPI
4683 global_memory_status (MEMORYSTATUS *buf)
4684 {
4685 static GlobalMemoryStatus_Proc s_pfn_Global_Memory_Status = NULL;
4686
4687 if (is_windows_9x () == TRUE)
4688 {
4689 return FALSE;
4690 }
4691 if (g_b_init_global_memory_status == 0)
4692 {
4693 g_b_init_global_memory_status = 1;
4694 s_pfn_Global_Memory_Status = (GlobalMemoryStatus_Proc)
4695 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4696 "GlobalMemoryStatus");
4697 }
4698 if (s_pfn_Global_Memory_Status == NULL)
4699 {
4700 return FALSE;
4701 }
4702 return s_pfn_Global_Memory_Status (buf);
4703 }
4704
4705 static BOOL WINAPI
4706 global_memory_status_ex (MEMORY_STATUS_EX *buf)
4707 {
4708 static GlobalMemoryStatusEx_Proc s_pfn_Global_Memory_Status_Ex = NULL;
4709
4710 if (is_windows_9x () == TRUE)
4711 {
4712 return FALSE;
4713 }
4714 if (g_b_init_global_memory_status_ex == 0)
4715 {
4716 g_b_init_global_memory_status_ex = 1;
4717 s_pfn_Global_Memory_Status_Ex = (GlobalMemoryStatusEx_Proc)
4718 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4719 "GlobalMemoryStatusEx");
4720 }
4721 if (s_pfn_Global_Memory_Status_Ex == NULL)
4722 {
4723 return FALSE;
4724 }
4725 return s_pfn_Global_Memory_Status_Ex (buf);
4726 }
4727
4728 Lisp_Object
4729 list_system_processes (void)
4730 {
4731 struct gcpro gcpro1;
4732 Lisp_Object proclist = Qnil;
4733 HANDLE h_snapshot;
4734
4735 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
4736
4737 if (h_snapshot != INVALID_HANDLE_VALUE)
4738 {
4739 PROCESSENTRY32 proc_entry;
4740 DWORD proc_id;
4741 BOOL res;
4742
4743 GCPRO1 (proclist);
4744
4745 proc_entry.dwSize = sizeof (PROCESSENTRY32);
4746 for (res = process32_first (h_snapshot, &proc_entry); res;
4747 res = process32_next (h_snapshot, &proc_entry))
4748 {
4749 proc_id = proc_entry.th32ProcessID;
4750 proclist = Fcons (make_fixnum_or_float (proc_id), proclist);
4751 }
4752
4753 CloseHandle (h_snapshot);
4754 UNGCPRO;
4755 proclist = Fnreverse (proclist);
4756 }
4757
4758 return proclist;
4759 }
4760
4761 static int
4762 enable_privilege (LPCTSTR priv_name, BOOL enable_p, TOKEN_PRIVILEGES *old_priv)
4763 {
4764 TOKEN_PRIVILEGES priv;
4765 DWORD priv_size = sizeof (priv);
4766 DWORD opriv_size = sizeof (*old_priv);
4767 HANDLE h_token = NULL;
4768 HANDLE h_thread = GetCurrentThread ();
4769 int ret_val = 0;
4770 BOOL res;
4771
4772 res = open_thread_token (h_thread,
4773 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4774 FALSE, &h_token);
4775 if (!res && GetLastError () == ERROR_NO_TOKEN)
4776 {
4777 if (impersonate_self (SecurityImpersonation))
4778 res = open_thread_token (h_thread,
4779 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4780 FALSE, &h_token);
4781 }
4782 if (res)
4783 {
4784 priv.PrivilegeCount = 1;
4785 priv.Privileges[0].Attributes = enable_p ? SE_PRIVILEGE_ENABLED : 0;
4786 LookupPrivilegeValue (NULL, priv_name, &priv.Privileges[0].Luid);
4787 if (AdjustTokenPrivileges (h_token, FALSE, &priv, priv_size,
4788 old_priv, &opriv_size)
4789 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
4790 ret_val = 1;
4791 }
4792 if (h_token)
4793 CloseHandle (h_token);
4794
4795 return ret_val;
4796 }
4797
4798 static int
4799 restore_privilege (TOKEN_PRIVILEGES *priv)
4800 {
4801 DWORD priv_size = sizeof (*priv);
4802 HANDLE h_token = NULL;
4803 int ret_val = 0;
4804
4805 if (open_thread_token (GetCurrentThread (),
4806 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4807 FALSE, &h_token))
4808 {
4809 if (AdjustTokenPrivileges (h_token, FALSE, priv, priv_size, NULL, NULL)
4810 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
4811 ret_val = 1;
4812 }
4813 if (h_token)
4814 CloseHandle (h_token);
4815
4816 return ret_val;
4817 }
4818
4819 static Lisp_Object
4820 ltime (ULONGLONG time_100ns)
4821 {
4822 ULONGLONG time_sec = time_100ns / 10000000;
4823 int subsec = time_100ns % 10000000;
4824 return list4 (make_number (time_sec >> 16),
4825 make_number (time_sec & 0xffff),
4826 make_number (subsec / 10),
4827 make_number (subsec % 10 * 100000));
4828 }
4829
4830 #define U64_TO_LISP_TIME(time) ltime (time)
4831
4832 static int
4833 process_times (HANDLE h_proc, Lisp_Object *ctime, Lisp_Object *etime,
4834 Lisp_Object *stime, Lisp_Object *utime, Lisp_Object *ttime,
4835 double *pcpu)
4836 {
4837 FILETIME ft_creation, ft_exit, ft_kernel, ft_user, ft_current;
4838 ULONGLONG tem1, tem2, tem3, tem;
4839
4840 if (!h_proc
4841 || !get_process_times_fn
4842 || !(*get_process_times_fn) (h_proc, &ft_creation, &ft_exit,
4843 &ft_kernel, &ft_user))
4844 return 0;
4845
4846 GetSystemTimeAsFileTime (&ft_current);
4847
4848 FILETIME_TO_U64 (tem1, ft_kernel);
4849 *stime = U64_TO_LISP_TIME (tem1);
4850
4851 FILETIME_TO_U64 (tem2, ft_user);
4852 *utime = U64_TO_LISP_TIME (tem2);
4853
4854 tem3 = tem1 + tem2;
4855 *ttime = U64_TO_LISP_TIME (tem3);
4856
4857 FILETIME_TO_U64 (tem, ft_creation);
4858 /* Process no 4 (System) returns zero creation time. */
4859 if (tem)
4860 tem -= utc_base;
4861 *ctime = U64_TO_LISP_TIME (tem);
4862
4863 if (tem)
4864 {
4865 FILETIME_TO_U64 (tem3, ft_current);
4866 tem = (tem3 - utc_base) - tem;
4867 }
4868 *etime = U64_TO_LISP_TIME (tem);
4869
4870 if (tem)
4871 {
4872 *pcpu = 100.0 * (tem1 + tem2) / tem;
4873 if (*pcpu > 100)
4874 *pcpu = 100.0;
4875 }
4876 else
4877 *pcpu = 0;
4878
4879 return 1;
4880 }
4881
4882 Lisp_Object
4883 system_process_attributes (Lisp_Object pid)
4884 {
4885 struct gcpro gcpro1, gcpro2, gcpro3;
4886 Lisp_Object attrs = Qnil;
4887 Lisp_Object cmd_str, decoded_cmd, tem;
4888 HANDLE h_snapshot, h_proc;
4889 DWORD proc_id;
4890 int found_proc = 0;
4891 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
4892 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
4893 DWORD glength = sizeof (gname);
4894 HANDLE token = NULL;
4895 SID_NAME_USE user_type;
4896 unsigned char *buf = NULL;
4897 DWORD blen = 0;
4898 TOKEN_USER user_token;
4899 TOKEN_PRIMARY_GROUP group_token;
4900 unsigned euid;
4901 unsigned egid;
4902 PROCESS_MEMORY_COUNTERS mem;
4903 PROCESS_MEMORY_COUNTERS_EX mem_ex;
4904 DWORD minrss, maxrss;
4905 MEMORYSTATUS memst;
4906 MEMORY_STATUS_EX memstex;
4907 double totphys = 0.0;
4908 Lisp_Object ctime, stime, utime, etime, ttime;
4909 double pcpu;
4910 BOOL result = FALSE;
4911
4912 CHECK_NUMBER_OR_FLOAT (pid);
4913 proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
4914
4915 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
4916
4917 GCPRO3 (attrs, decoded_cmd, tem);
4918
4919 if (h_snapshot != INVALID_HANDLE_VALUE)
4920 {
4921 PROCESSENTRY32 pe;
4922 BOOL res;
4923
4924 pe.dwSize = sizeof (PROCESSENTRY32);
4925 for (res = process32_first (h_snapshot, &pe); res;
4926 res = process32_next (h_snapshot, &pe))
4927 {
4928 if (proc_id == pe.th32ProcessID)
4929 {
4930 if (proc_id == 0)
4931 decoded_cmd = build_string ("Idle");
4932 else
4933 {
4934 /* Decode the command name from locale-specific
4935 encoding. */
4936 cmd_str = make_unibyte_string (pe.szExeFile,
4937 strlen (pe.szExeFile));
4938 decoded_cmd =
4939 code_convert_string_norecord (cmd_str,
4940 Vlocale_coding_system, 0);
4941 }
4942 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
4943 attrs = Fcons (Fcons (Qppid,
4944 make_fixnum_or_float (pe.th32ParentProcessID)),
4945 attrs);
4946 attrs = Fcons (Fcons (Qpri, make_number (pe.pcPriClassBase)),
4947 attrs);
4948 attrs = Fcons (Fcons (Qthcount,
4949 make_fixnum_or_float (pe.cntThreads)),
4950 attrs);
4951 found_proc = 1;
4952 break;
4953 }
4954 }
4955
4956 CloseHandle (h_snapshot);
4957 }
4958
4959 if (!found_proc)
4960 {
4961 UNGCPRO;
4962 return Qnil;
4963 }
4964
4965 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
4966 FALSE, proc_id);
4967 /* If we were denied a handle to the process, try again after
4968 enabling the SeDebugPrivilege in our process. */
4969 if (!h_proc)
4970 {
4971 TOKEN_PRIVILEGES priv_current;
4972
4973 if (enable_privilege (SE_DEBUG_NAME, TRUE, &priv_current))
4974 {
4975 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
4976 FALSE, proc_id);
4977 restore_privilege (&priv_current);
4978 revert_to_self ();
4979 }
4980 }
4981 if (h_proc)
4982 {
4983 result = open_process_token (h_proc, TOKEN_QUERY, &token);
4984 if (result)
4985 {
4986 result = get_token_information (token, TokenUser, NULL, 0, &blen);
4987 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
4988 {
4989 buf = xmalloc (blen);
4990 result = get_token_information (token, TokenUser,
4991 (LPVOID)buf, blen, &needed);
4992 if (result)
4993 {
4994 memcpy (&user_token, buf, sizeof (user_token));
4995 if (!w32_cached_id (user_token.User.Sid, &euid, uname))
4996 {
4997 euid = get_rid (user_token.User.Sid);
4998 result = lookup_account_sid (NULL, user_token.User.Sid,
4999 uname, &ulength,
5000 domain, &dlength,
5001 &user_type);
5002 if (result)
5003 w32_add_to_cache (user_token.User.Sid, euid, uname);
5004 else
5005 {
5006 strcpy (uname, "unknown");
5007 result = TRUE;
5008 }
5009 }
5010 ulength = strlen (uname);
5011 }
5012 }
5013 }
5014 if (result)
5015 {
5016 /* Determine a reasonable euid and gid values. */
5017 if (xstrcasecmp ("administrator", uname) == 0)
5018 {
5019 euid = 500; /* well-known Administrator uid */
5020 egid = 513; /* well-known None gid */
5021 }
5022 else
5023 {
5024 /* Get group id and name. */
5025 result = get_token_information (token, TokenPrimaryGroup,
5026 (LPVOID)buf, blen, &needed);
5027 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
5028 {
5029 buf = xrealloc (buf, blen = needed);
5030 result = get_token_information (token, TokenPrimaryGroup,
5031 (LPVOID)buf, blen, &needed);
5032 }
5033 if (result)
5034 {
5035 memcpy (&group_token, buf, sizeof (group_token));
5036 if (!w32_cached_id (group_token.PrimaryGroup, &egid, gname))
5037 {
5038 egid = get_rid (group_token.PrimaryGroup);
5039 dlength = sizeof (domain);
5040 result =
5041 lookup_account_sid (NULL, group_token.PrimaryGroup,
5042 gname, &glength, NULL, &dlength,
5043 &user_type);
5044 if (result)
5045 w32_add_to_cache (group_token.PrimaryGroup,
5046 egid, gname);
5047 else
5048 {
5049 strcpy (gname, "None");
5050 result = TRUE;
5051 }
5052 }
5053 glength = strlen (gname);
5054 }
5055 }
5056 }
5057 xfree (buf);
5058 }
5059 if (!result)
5060 {
5061 if (!is_windows_9x ())
5062 {
5063 /* We couldn't open the process token, presumably because of
5064 insufficient access rights. Assume this process is run
5065 by the system. */
5066 strcpy (uname, "SYSTEM");
5067 strcpy (gname, "None");
5068 euid = 18; /* SYSTEM */
5069 egid = 513; /* None */
5070 glength = strlen (gname);
5071 ulength = strlen (uname);
5072 }
5073 /* If we are running under Windows 9X, where security calls are
5074 not supported, we assume all processes are run by the current
5075 user. */
5076 else if (GetUserName (uname, &ulength))
5077 {
5078 if (xstrcasecmp ("administrator", uname) == 0)
5079 euid = 0;
5080 else
5081 euid = 123;
5082 egid = euid;
5083 strcpy (gname, "None");
5084 glength = strlen (gname);
5085 ulength = strlen (uname);
5086 }
5087 else
5088 {
5089 euid = 123;
5090 egid = 123;
5091 strcpy (uname, "administrator");
5092 ulength = strlen (uname);
5093 strcpy (gname, "None");
5094 glength = strlen (gname);
5095 }
5096 if (token)
5097 CloseHandle (token);
5098 }
5099
5100 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (euid)), attrs);
5101 tem = make_unibyte_string (uname, ulength);
5102 attrs = Fcons (Fcons (Quser,
5103 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
5104 attrs);
5105 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (egid)), attrs);
5106 tem = make_unibyte_string (gname, glength);
5107 attrs = Fcons (Fcons (Qgroup,
5108 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
5109 attrs);
5110
5111 if (global_memory_status_ex (&memstex))
5112 #if __GNUC__ || (defined (_MSC_VER) && _MSC_VER >= 1300)
5113 totphys = memstex.ullTotalPhys / 1024.0;
5114 #else
5115 /* Visual Studio 6 cannot convert an unsigned __int64 type to
5116 double, so we need to do this for it... */
5117 {
5118 DWORD tot_hi = memstex.ullTotalPhys >> 32;
5119 DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffff) >> 10;
5120 DWORD tot_lo = memstex.ullTotalPhys % 1024;
5121
5122 totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
5123 }
5124 #endif /* __GNUC__ || _MSC_VER >= 1300 */
5125 else if (global_memory_status (&memst))
5126 totphys = memst.dwTotalPhys / 1024.0;
5127
5128 if (h_proc
5129 && get_process_memory_info (h_proc, (PROCESS_MEMORY_COUNTERS *)&mem_ex,
5130 sizeof (mem_ex)))
5131 {
5132 DWORD rss = mem_ex.WorkingSetSize / 1024;
5133
5134 attrs = Fcons (Fcons (Qmajflt,
5135 make_fixnum_or_float (mem_ex.PageFaultCount)),
5136 attrs);
5137 attrs = Fcons (Fcons (Qvsize,
5138 make_fixnum_or_float (mem_ex.PrivateUsage / 1024)),
5139 attrs);
5140 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
5141 if (totphys)
5142 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5143 }
5144 else if (h_proc
5145 && get_process_memory_info (h_proc, &mem, sizeof (mem)))
5146 {
5147 DWORD rss = mem_ex.WorkingSetSize / 1024;
5148
5149 attrs = Fcons (Fcons (Qmajflt,
5150 make_fixnum_or_float (mem.PageFaultCount)),
5151 attrs);
5152 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
5153 if (totphys)
5154 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5155 }
5156 else if (h_proc
5157 && get_process_working_set_size (h_proc, &minrss, &maxrss))
5158 {
5159 DWORD rss = maxrss / 1024;
5160
5161 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (maxrss / 1024)), attrs);
5162 if (totphys)
5163 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5164 }
5165
5166 if (process_times (h_proc, &ctime, &etime, &stime, &utime, &ttime, &pcpu))
5167 {
5168 attrs = Fcons (Fcons (Qutime, utime), attrs);
5169 attrs = Fcons (Fcons (Qstime, stime), attrs);
5170 attrs = Fcons (Fcons (Qtime, ttime), attrs);
5171 attrs = Fcons (Fcons (Qstart, ctime), attrs);
5172 attrs = Fcons (Fcons (Qetime, etime), attrs);
5173 attrs = Fcons (Fcons (Qpcpu, make_float (pcpu)), attrs);
5174 }
5175
5176 /* FIXME: Retrieve command line by walking the PEB of the process. */
5177
5178 if (h_proc)
5179 CloseHandle (h_proc);
5180 UNGCPRO;
5181 return attrs;
5182 }
5183
5184 \f
5185 /* Wrappers for winsock functions to map between our file descriptors
5186 and winsock's handles; also set h_errno for convenience.
5187
5188 To allow Emacs to run on systems which don't have winsock support
5189 installed, we dynamically link to winsock on startup if present, and
5190 otherwise provide the minimum necessary functionality
5191 (eg. gethostname). */
5192
5193 /* function pointers for relevant socket functions */
5194 int (PASCAL *pfn_WSAStartup) (WORD wVersionRequired, LPWSADATA lpWSAData);
5195 void (PASCAL *pfn_WSASetLastError) (int iError);
5196 int (PASCAL *pfn_WSAGetLastError) (void);
5197 int (PASCAL *pfn_WSAEventSelect) (SOCKET s, HANDLE hEventObject, long lNetworkEvents);
5198 HANDLE (PASCAL *pfn_WSACreateEvent) (void);
5199 int (PASCAL *pfn_WSACloseEvent) (HANDLE hEvent);
5200 int (PASCAL *pfn_socket) (int af, int type, int protocol);
5201 int (PASCAL *pfn_bind) (SOCKET s, const struct sockaddr *addr, int namelen);
5202 int (PASCAL *pfn_connect) (SOCKET s, const struct sockaddr *addr, int namelen);
5203 int (PASCAL *pfn_ioctlsocket) (SOCKET s, long cmd, u_long *argp);
5204 int (PASCAL *pfn_recv) (SOCKET s, char * buf, int len, int flags);
5205 int (PASCAL *pfn_send) (SOCKET s, const char * buf, int len, int flags);
5206 int (PASCAL *pfn_closesocket) (SOCKET s);
5207 int (PASCAL *pfn_shutdown) (SOCKET s, int how);
5208 int (PASCAL *pfn_WSACleanup) (void);
5209
5210 u_short (PASCAL *pfn_htons) (u_short hostshort);
5211 u_short (PASCAL *pfn_ntohs) (u_short netshort);
5212 unsigned long (PASCAL *pfn_inet_addr) (const char * cp);
5213 int (PASCAL *pfn_gethostname) (char * name, int namelen);
5214 struct hostent * (PASCAL *pfn_gethostbyname) (const char * name);
5215 struct servent * (PASCAL *pfn_getservbyname) (const char * name, const char * proto);
5216 int (PASCAL *pfn_getpeername) (SOCKET s, struct sockaddr *addr, int * namelen);
5217 int (PASCAL *pfn_setsockopt) (SOCKET s, int level, int optname,
5218 const char * optval, int optlen);
5219 int (PASCAL *pfn_listen) (SOCKET s, int backlog);
5220 int (PASCAL *pfn_getsockname) (SOCKET s, struct sockaddr * name,
5221 int * namelen);
5222 SOCKET (PASCAL *pfn_accept) (SOCKET s, struct sockaddr * addr, int * addrlen);
5223 int (PASCAL *pfn_recvfrom) (SOCKET s, char * buf, int len, int flags,
5224 struct sockaddr * from, int * fromlen);
5225 int (PASCAL *pfn_sendto) (SOCKET s, const char * buf, int len, int flags,
5226 const struct sockaddr * to, int tolen);
5227
5228 /* SetHandleInformation is only needed to make sockets non-inheritable. */
5229 BOOL (WINAPI *pfn_SetHandleInformation) (HANDLE object, DWORD mask, DWORD flags);
5230 #ifndef HANDLE_FLAG_INHERIT
5231 #define HANDLE_FLAG_INHERIT 1
5232 #endif
5233
5234 HANDLE winsock_lib;
5235 static int winsock_inuse;
5236
5237 BOOL
5238 term_winsock (void)
5239 {
5240 if (winsock_lib != NULL && winsock_inuse == 0)
5241 {
5242 /* Not sure what would cause WSAENETDOWN, or even if it can happen
5243 after WSAStartup returns successfully, but it seems reasonable
5244 to allow unloading winsock anyway in that case. */
5245 if (pfn_WSACleanup () == 0 ||
5246 pfn_WSAGetLastError () == WSAENETDOWN)
5247 {
5248 if (FreeLibrary (winsock_lib))
5249 winsock_lib = NULL;
5250 return TRUE;
5251 }
5252 }
5253 return FALSE;
5254 }
5255
5256 BOOL
5257 init_winsock (int load_now)
5258 {
5259 WSADATA winsockData;
5260
5261 if (winsock_lib != NULL)
5262 return TRUE;
5263
5264 pfn_SetHandleInformation
5265 = (void *) GetProcAddress (GetModuleHandle ("kernel32.dll"),
5266 "SetHandleInformation");
5267
5268 winsock_lib = LoadLibrary ("Ws2_32.dll");
5269
5270 if (winsock_lib != NULL)
5271 {
5272 /* dynamically link to socket functions */
5273
5274 #define LOAD_PROC(fn) \
5275 if ((pfn_##fn = (void *) GetProcAddress (winsock_lib, #fn)) == NULL) \
5276 goto fail;
5277
5278 LOAD_PROC (WSAStartup);
5279 LOAD_PROC (WSASetLastError);
5280 LOAD_PROC (WSAGetLastError);
5281 LOAD_PROC (WSAEventSelect);
5282 LOAD_PROC (WSACreateEvent);
5283 LOAD_PROC (WSACloseEvent);
5284 LOAD_PROC (socket);
5285 LOAD_PROC (bind);
5286 LOAD_PROC (connect);
5287 LOAD_PROC (ioctlsocket);
5288 LOAD_PROC (recv);
5289 LOAD_PROC (send);
5290 LOAD_PROC (closesocket);
5291 LOAD_PROC (shutdown);
5292 LOAD_PROC (htons);
5293 LOAD_PROC (ntohs);
5294 LOAD_PROC (inet_addr);
5295 LOAD_PROC (gethostname);
5296 LOAD_PROC (gethostbyname);
5297 LOAD_PROC (getservbyname);
5298 LOAD_PROC (getpeername);
5299 LOAD_PROC (WSACleanup);
5300 LOAD_PROC (setsockopt);
5301 LOAD_PROC (listen);
5302 LOAD_PROC (getsockname);
5303 LOAD_PROC (accept);
5304 LOAD_PROC (recvfrom);
5305 LOAD_PROC (sendto);
5306 #undef LOAD_PROC
5307
5308 /* specify version 1.1 of winsock */
5309 if (pfn_WSAStartup (0x101, &winsockData) == 0)
5310 {
5311 if (winsockData.wVersion != 0x101)
5312 goto fail;
5313
5314 if (!load_now)
5315 {
5316 /* Report that winsock exists and is usable, but leave
5317 socket functions disabled. I am assuming that calling
5318 WSAStartup does not require any network interaction,
5319 and in particular does not cause or require a dial-up
5320 connection to be established. */
5321
5322 pfn_WSACleanup ();
5323 FreeLibrary (winsock_lib);
5324 winsock_lib = NULL;
5325 }
5326 winsock_inuse = 0;
5327 return TRUE;
5328 }
5329
5330 fail:
5331 FreeLibrary (winsock_lib);
5332 winsock_lib = NULL;
5333 }
5334
5335 return FALSE;
5336 }
5337
5338
5339 int h_errno = 0;
5340
5341 /* function to set h_errno for compatibility; map winsock error codes to
5342 normal system codes where they overlap (non-overlapping definitions
5343 are already in <sys/socket.h> */
5344 static void
5345 set_errno (void)
5346 {
5347 if (winsock_lib == NULL)
5348 h_errno = EINVAL;
5349 else
5350 h_errno = pfn_WSAGetLastError ();
5351
5352 switch (h_errno)
5353 {
5354 case WSAEACCES: h_errno = EACCES; break;
5355 case WSAEBADF: h_errno = EBADF; break;
5356 case WSAEFAULT: h_errno = EFAULT; break;
5357 case WSAEINTR: h_errno = EINTR; break;
5358 case WSAEINVAL: h_errno = EINVAL; break;
5359 case WSAEMFILE: h_errno = EMFILE; break;
5360 case WSAENAMETOOLONG: h_errno = ENAMETOOLONG; break;
5361 case WSAENOTEMPTY: h_errno = ENOTEMPTY; break;
5362 }
5363 errno = h_errno;
5364 }
5365
5366 static void
5367 check_errno (void)
5368 {
5369 if (h_errno == 0 && winsock_lib != NULL)
5370 pfn_WSASetLastError (0);
5371 }
5372
5373 /* Extend strerror to handle the winsock-specific error codes. */
5374 struct {
5375 int errnum;
5376 char * msg;
5377 } _wsa_errlist[] = {
5378 {WSAEINTR , "Interrupted function call"},
5379 {WSAEBADF , "Bad file descriptor"},
5380 {WSAEACCES , "Permission denied"},
5381 {WSAEFAULT , "Bad address"},
5382 {WSAEINVAL , "Invalid argument"},
5383 {WSAEMFILE , "Too many open files"},
5384
5385 {WSAEWOULDBLOCK , "Resource temporarily unavailable"},
5386 {WSAEINPROGRESS , "Operation now in progress"},
5387 {WSAEALREADY , "Operation already in progress"},
5388 {WSAENOTSOCK , "Socket operation on non-socket"},
5389 {WSAEDESTADDRREQ , "Destination address required"},
5390 {WSAEMSGSIZE , "Message too long"},
5391 {WSAEPROTOTYPE , "Protocol wrong type for socket"},
5392 {WSAENOPROTOOPT , "Bad protocol option"},
5393 {WSAEPROTONOSUPPORT , "Protocol not supported"},
5394 {WSAESOCKTNOSUPPORT , "Socket type not supported"},
5395 {WSAEOPNOTSUPP , "Operation not supported"},
5396 {WSAEPFNOSUPPORT , "Protocol family not supported"},
5397 {WSAEAFNOSUPPORT , "Address family not supported by protocol family"},
5398 {WSAEADDRINUSE , "Address already in use"},
5399 {WSAEADDRNOTAVAIL , "Cannot assign requested address"},
5400 {WSAENETDOWN , "Network is down"},
5401 {WSAENETUNREACH , "Network is unreachable"},
5402 {WSAENETRESET , "Network dropped connection on reset"},
5403 {WSAECONNABORTED , "Software caused connection abort"},
5404 {WSAECONNRESET , "Connection reset by peer"},
5405 {WSAENOBUFS , "No buffer space available"},
5406 {WSAEISCONN , "Socket is already connected"},
5407 {WSAENOTCONN , "Socket is not connected"},
5408 {WSAESHUTDOWN , "Cannot send after socket shutdown"},
5409 {WSAETOOMANYREFS , "Too many references"}, /* not sure */
5410 {WSAETIMEDOUT , "Connection timed out"},
5411 {WSAECONNREFUSED , "Connection refused"},
5412 {WSAELOOP , "Network loop"}, /* not sure */
5413 {WSAENAMETOOLONG , "Name is too long"},
5414 {WSAEHOSTDOWN , "Host is down"},
5415 {WSAEHOSTUNREACH , "No route to host"},
5416 {WSAENOTEMPTY , "Buffer not empty"}, /* not sure */
5417 {WSAEPROCLIM , "Too many processes"},
5418 {WSAEUSERS , "Too many users"}, /* not sure */
5419 {WSAEDQUOT , "Double quote in host name"}, /* really not sure */
5420 {WSAESTALE , "Data is stale"}, /* not sure */
5421 {WSAEREMOTE , "Remote error"}, /* not sure */
5422
5423 {WSASYSNOTREADY , "Network subsystem is unavailable"},
5424 {WSAVERNOTSUPPORTED , "WINSOCK.DLL version out of range"},
5425 {WSANOTINITIALISED , "Winsock not initialized successfully"},
5426 {WSAEDISCON , "Graceful shutdown in progress"},
5427 #ifdef WSAENOMORE
5428 {WSAENOMORE , "No more operations allowed"}, /* not sure */
5429 {WSAECANCELLED , "Operation cancelled"}, /* not sure */
5430 {WSAEINVALIDPROCTABLE , "Invalid procedure table from service provider"},
5431 {WSAEINVALIDPROVIDER , "Invalid service provider version number"},
5432 {WSAEPROVIDERFAILEDINIT , "Unable to initialize a service provider"},
5433 {WSASYSCALLFAILURE , "System call failure"},
5434 {WSASERVICE_NOT_FOUND , "Service not found"}, /* not sure */
5435 {WSATYPE_NOT_FOUND , "Class type not found"},
5436 {WSA_E_NO_MORE , "No more resources available"}, /* really not sure */
5437 {WSA_E_CANCELLED , "Operation already cancelled"}, /* really not sure */
5438 {WSAEREFUSED , "Operation refused"}, /* not sure */
5439 #endif
5440
5441 {WSAHOST_NOT_FOUND , "Host not found"},
5442 {WSATRY_AGAIN , "Authoritative host not found during name lookup"},
5443 {WSANO_RECOVERY , "Non-recoverable error during name lookup"},
5444 {WSANO_DATA , "Valid name, no data record of requested type"},
5445
5446 {-1, NULL}
5447 };
5448
5449 char *
5450 sys_strerror (int error_no)
5451 {
5452 int i;
5453 static char unknown_msg[40];
5454
5455 if (error_no >= 0 && error_no < sys_nerr)
5456 return sys_errlist[error_no];
5457
5458 for (i = 0; _wsa_errlist[i].errnum >= 0; i++)
5459 if (_wsa_errlist[i].errnum == error_no)
5460 return _wsa_errlist[i].msg;
5461
5462 sprintf (unknown_msg, "Unidentified error: %d", error_no);
5463 return unknown_msg;
5464 }
5465
5466 /* [andrewi 3-May-96] I've had conflicting results using both methods,
5467 but I believe the method of keeping the socket handle separate (and
5468 insuring it is not inheritable) is the correct one. */
5469
5470 #define SOCK_HANDLE(fd) ((SOCKET) fd_info[fd].hnd)
5471
5472 static int socket_to_fd (SOCKET s);
5473
5474 int
5475 sys_socket (int af, int type, int protocol)
5476 {
5477 SOCKET s;
5478
5479 if (winsock_lib == NULL)
5480 {
5481 h_errno = ENETDOWN;
5482 return INVALID_SOCKET;
5483 }
5484
5485 check_errno ();
5486
5487 /* call the real socket function */
5488 s = pfn_socket (af, type, protocol);
5489
5490 if (s != INVALID_SOCKET)
5491 return socket_to_fd (s);
5492
5493 set_errno ();
5494 return -1;
5495 }
5496
5497 /* Convert a SOCKET to a file descriptor. */
5498 static int
5499 socket_to_fd (SOCKET s)
5500 {
5501 int fd;
5502 child_process * cp;
5503
5504 /* Although under NT 3.5 _open_osfhandle will accept a socket
5505 handle, if opened with SO_OPENTYPE == SO_SYNCHRONOUS_NONALERT,
5506 that does not work under NT 3.1. However, we can get the same
5507 effect by using a backdoor function to replace an existing
5508 descriptor handle with the one we want. */
5509
5510 /* allocate a file descriptor (with appropriate flags) */
5511 fd = _open ("NUL:", _O_RDWR);
5512 if (fd >= 0)
5513 {
5514 /* Make a non-inheritable copy of the socket handle. Note
5515 that it is possible that sockets aren't actually kernel
5516 handles, which appears to be the case on Windows 9x when
5517 the MS Proxy winsock client is installed. */
5518 {
5519 /* Apparently there is a bug in NT 3.51 with some service
5520 packs, which prevents using DuplicateHandle to make a
5521 socket handle non-inheritable (causes WSACleanup to
5522 hang). The work-around is to use SetHandleInformation
5523 instead if it is available and implemented. */
5524 if (pfn_SetHandleInformation)
5525 {
5526 pfn_SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
5527 }
5528 else
5529 {
5530 HANDLE parent = GetCurrentProcess ();
5531 HANDLE new_s = INVALID_HANDLE_VALUE;
5532
5533 if (DuplicateHandle (parent,
5534 (HANDLE) s,
5535 parent,
5536 &new_s,
5537 0,
5538 FALSE,
5539 DUPLICATE_SAME_ACCESS))
5540 {
5541 /* It is possible that DuplicateHandle succeeds even
5542 though the socket wasn't really a kernel handle,
5543 because a real handle has the same value. So
5544 test whether the new handle really is a socket. */
5545 long nonblocking = 0;
5546 if (pfn_ioctlsocket ((SOCKET) new_s, FIONBIO, &nonblocking) == 0)
5547 {
5548 pfn_closesocket (s);
5549 s = (SOCKET) new_s;
5550 }
5551 else
5552 {
5553 CloseHandle (new_s);
5554 }
5555 }
5556 }
5557 }
5558 fd_info[fd].hnd = (HANDLE) s;
5559
5560 /* set our own internal flags */
5561 fd_info[fd].flags = FILE_SOCKET | FILE_BINARY | FILE_READ | FILE_WRITE;
5562
5563 cp = new_child ();
5564 if (cp)
5565 {
5566 cp->fd = fd;
5567 cp->status = STATUS_READ_ACKNOWLEDGED;
5568
5569 /* attach child_process to fd_info */
5570 if (fd_info[ fd ].cp != NULL)
5571 {
5572 DebPrint (("sys_socket: fd_info[%d] apparently in use!\n", fd));
5573 abort ();
5574 }
5575
5576 fd_info[ fd ].cp = cp;
5577
5578 /* success! */
5579 winsock_inuse++; /* count open sockets */
5580 return fd;
5581 }
5582
5583 /* clean up */
5584 _close (fd);
5585 }
5586 pfn_closesocket (s);
5587 h_errno = EMFILE;
5588 return -1;
5589 }
5590
5591 int
5592 sys_bind (int s, const struct sockaddr * addr, int namelen)
5593 {
5594 if (winsock_lib == NULL)
5595 {
5596 h_errno = ENOTSOCK;
5597 return SOCKET_ERROR;
5598 }
5599
5600 check_errno ();
5601 if (fd_info[s].flags & FILE_SOCKET)
5602 {
5603 int rc = pfn_bind (SOCK_HANDLE (s), addr, namelen);
5604 if (rc == SOCKET_ERROR)
5605 set_errno ();
5606 return rc;
5607 }
5608 h_errno = ENOTSOCK;
5609 return SOCKET_ERROR;
5610 }
5611
5612 int
5613 sys_connect (int s, const struct sockaddr * name, int namelen)
5614 {
5615 if (winsock_lib == NULL)
5616 {
5617 h_errno = ENOTSOCK;
5618 return SOCKET_ERROR;
5619 }
5620
5621 check_errno ();
5622 if (fd_info[s].flags & FILE_SOCKET)
5623 {
5624 int rc = pfn_connect (SOCK_HANDLE (s), name, namelen);
5625 if (rc == SOCKET_ERROR)
5626 set_errno ();
5627 return rc;
5628 }
5629 h_errno = ENOTSOCK;
5630 return SOCKET_ERROR;
5631 }
5632
5633 u_short
5634 sys_htons (u_short hostshort)
5635 {
5636 return (winsock_lib != NULL) ?
5637 pfn_htons (hostshort) : hostshort;
5638 }
5639
5640 u_short
5641 sys_ntohs (u_short netshort)
5642 {
5643 return (winsock_lib != NULL) ?
5644 pfn_ntohs (netshort) : netshort;
5645 }
5646
5647 unsigned long
5648 sys_inet_addr (const char * cp)
5649 {
5650 return (winsock_lib != NULL) ?
5651 pfn_inet_addr (cp) : INADDR_NONE;
5652 }
5653
5654 int
5655 sys_gethostname (char * name, int namelen)
5656 {
5657 if (winsock_lib != NULL)
5658 return pfn_gethostname (name, namelen);
5659
5660 if (namelen > MAX_COMPUTERNAME_LENGTH)
5661 return !GetComputerName (name, (DWORD *)&namelen);
5662
5663 h_errno = EFAULT;
5664 return SOCKET_ERROR;
5665 }
5666
5667 struct hostent *
5668 sys_gethostbyname (const char * name)
5669 {
5670 struct hostent * host;
5671
5672 if (winsock_lib == NULL)
5673 {
5674 h_errno = ENETDOWN;
5675 return NULL;
5676 }
5677
5678 check_errno ();
5679 host = pfn_gethostbyname (name);
5680 if (!host)
5681 set_errno ();
5682 return host;
5683 }
5684
5685 struct servent *
5686 sys_getservbyname (const char * name, const char * proto)
5687 {
5688 struct servent * serv;
5689
5690 if (winsock_lib == NULL)
5691 {
5692 h_errno = ENETDOWN;
5693 return NULL;
5694 }
5695
5696 check_errno ();
5697 serv = pfn_getservbyname (name, proto);
5698 if (!serv)
5699 set_errno ();
5700 return serv;
5701 }
5702
5703 int
5704 sys_getpeername (int s, struct sockaddr *addr, int * namelen)
5705 {
5706 if (winsock_lib == NULL)
5707 {
5708 h_errno = ENETDOWN;
5709 return SOCKET_ERROR;
5710 }
5711
5712 check_errno ();
5713 if (fd_info[s].flags & FILE_SOCKET)
5714 {
5715 int rc = pfn_getpeername (SOCK_HANDLE (s), addr, namelen);
5716 if (rc == SOCKET_ERROR)
5717 set_errno ();
5718 return rc;
5719 }
5720 h_errno = ENOTSOCK;
5721 return SOCKET_ERROR;
5722 }
5723
5724 int
5725 sys_shutdown (int s, int how)
5726 {
5727 if (winsock_lib == NULL)
5728 {
5729 h_errno = ENETDOWN;
5730 return SOCKET_ERROR;
5731 }
5732
5733 check_errno ();
5734 if (fd_info[s].flags & FILE_SOCKET)
5735 {
5736 int rc = pfn_shutdown (SOCK_HANDLE (s), how);
5737 if (rc == SOCKET_ERROR)
5738 set_errno ();
5739 return rc;
5740 }
5741 h_errno = ENOTSOCK;
5742 return SOCKET_ERROR;
5743 }
5744
5745 int
5746 sys_setsockopt (int s, int level, int optname, const void * optval, int optlen)
5747 {
5748 if (winsock_lib == NULL)
5749 {
5750 h_errno = ENETDOWN;
5751 return SOCKET_ERROR;
5752 }
5753
5754 check_errno ();
5755 if (fd_info[s].flags & FILE_SOCKET)
5756 {
5757 int rc = pfn_setsockopt (SOCK_HANDLE (s), level, optname,
5758 (const char *)optval, optlen);
5759 if (rc == SOCKET_ERROR)
5760 set_errno ();
5761 return rc;
5762 }
5763 h_errno = ENOTSOCK;
5764 return SOCKET_ERROR;
5765 }
5766
5767 int
5768 sys_listen (int s, int backlog)
5769 {
5770 if (winsock_lib == NULL)
5771 {
5772 h_errno = ENETDOWN;
5773 return SOCKET_ERROR;
5774 }
5775
5776 check_errno ();
5777 if (fd_info[s].flags & FILE_SOCKET)
5778 {
5779 int rc = pfn_listen (SOCK_HANDLE (s), backlog);
5780 if (rc == SOCKET_ERROR)
5781 set_errno ();
5782 else
5783 fd_info[s].flags |= FILE_LISTEN;
5784 return rc;
5785 }
5786 h_errno = ENOTSOCK;
5787 return SOCKET_ERROR;
5788 }
5789
5790 int
5791 sys_getsockname (int s, struct sockaddr * name, int * namelen)
5792 {
5793 if (winsock_lib == NULL)
5794 {
5795 h_errno = ENETDOWN;
5796 return SOCKET_ERROR;
5797 }
5798
5799 check_errno ();
5800 if (fd_info[s].flags & FILE_SOCKET)
5801 {
5802 int rc = pfn_getsockname (SOCK_HANDLE (s), name, namelen);
5803 if (rc == SOCKET_ERROR)
5804 set_errno ();
5805 return rc;
5806 }
5807 h_errno = ENOTSOCK;
5808 return SOCKET_ERROR;
5809 }
5810
5811 int
5812 sys_accept (int s, struct sockaddr * addr, int * addrlen)
5813 {
5814 if (winsock_lib == NULL)
5815 {
5816 h_errno = ENETDOWN;
5817 return -1;
5818 }
5819
5820 check_errno ();
5821 if (fd_info[s].flags & FILE_LISTEN)
5822 {
5823 SOCKET t = pfn_accept (SOCK_HANDLE (s), addr, addrlen);
5824 int fd = -1;
5825 if (t == INVALID_SOCKET)
5826 set_errno ();
5827 else
5828 fd = socket_to_fd (t);
5829
5830 fd_info[s].cp->status = STATUS_READ_ACKNOWLEDGED;
5831 ResetEvent (fd_info[s].cp->char_avail);
5832 return fd;
5833 }
5834 h_errno = ENOTSOCK;
5835 return -1;
5836 }
5837
5838 int
5839 sys_recvfrom (int s, char * buf, int len, int flags,
5840 struct sockaddr * from, int * fromlen)
5841 {
5842 if (winsock_lib == NULL)
5843 {
5844 h_errno = ENETDOWN;
5845 return SOCKET_ERROR;
5846 }
5847
5848 check_errno ();
5849 if (fd_info[s].flags & FILE_SOCKET)
5850 {
5851 int rc = pfn_recvfrom (SOCK_HANDLE (s), buf, len, flags, from, fromlen);
5852 if (rc == SOCKET_ERROR)
5853 set_errno ();
5854 return rc;
5855 }
5856 h_errno = ENOTSOCK;
5857 return SOCKET_ERROR;
5858 }
5859
5860 int
5861 sys_sendto (int s, const char * buf, int len, int flags,
5862 const struct sockaddr * to, int tolen)
5863 {
5864 if (winsock_lib == NULL)
5865 {
5866 h_errno = ENETDOWN;
5867 return SOCKET_ERROR;
5868 }
5869
5870 check_errno ();
5871 if (fd_info[s].flags & FILE_SOCKET)
5872 {
5873 int rc = pfn_sendto (SOCK_HANDLE (s), buf, len, flags, to, tolen);
5874 if (rc == SOCKET_ERROR)
5875 set_errno ();
5876 return rc;
5877 }
5878 h_errno = ENOTSOCK;
5879 return SOCKET_ERROR;
5880 }
5881
5882 /* Windows does not have an fcntl function. Provide an implementation
5883 solely for making sockets non-blocking. */
5884 int
5885 fcntl (int s, int cmd, int options)
5886 {
5887 if (winsock_lib == NULL)
5888 {
5889 h_errno = ENETDOWN;
5890 return -1;
5891 }
5892
5893 check_errno ();
5894 if (fd_info[s].flags & FILE_SOCKET)
5895 {
5896 if (cmd == F_SETFL && options == O_NDELAY)
5897 {
5898 unsigned long nblock = 1;
5899 int rc = pfn_ioctlsocket (SOCK_HANDLE (s), FIONBIO, &nblock);
5900 if (rc == SOCKET_ERROR)
5901 set_errno ();
5902 /* Keep track of the fact that we set this to non-blocking. */
5903 fd_info[s].flags |= FILE_NDELAY;
5904 return rc;
5905 }
5906 else
5907 {
5908 h_errno = EINVAL;
5909 return SOCKET_ERROR;
5910 }
5911 }
5912 h_errno = ENOTSOCK;
5913 return SOCKET_ERROR;
5914 }
5915
5916
5917 /* Shadow main io functions: we need to handle pipes and sockets more
5918 intelligently, and implement non-blocking mode as well. */
5919
5920 int
5921 sys_close (int fd)
5922 {
5923 int rc;
5924
5925 if (fd < 0)
5926 {
5927 errno = EBADF;
5928 return -1;
5929 }
5930
5931 if (fd < MAXDESC && fd_info[fd].cp)
5932 {
5933 child_process * cp = fd_info[fd].cp;
5934
5935 fd_info[fd].cp = NULL;
5936
5937 if (CHILD_ACTIVE (cp))
5938 {
5939 /* if last descriptor to active child_process then cleanup */
5940 int i;
5941 for (i = 0; i < MAXDESC; i++)
5942 {
5943 if (i == fd)
5944 continue;
5945 if (fd_info[i].cp == cp)
5946 break;
5947 }
5948 if (i == MAXDESC)
5949 {
5950 if (fd_info[fd].flags & FILE_SOCKET)
5951 {
5952 if (winsock_lib == NULL) abort ();
5953
5954 pfn_shutdown (SOCK_HANDLE (fd), 2);
5955 rc = pfn_closesocket (SOCK_HANDLE (fd));
5956
5957 winsock_inuse--; /* count open sockets */
5958 }
5959 delete_child (cp);
5960 }
5961 }
5962 }
5963
5964 /* Note that sockets do not need special treatment here (at least on
5965 NT and Windows 95 using the standard tcp/ip stacks) - it appears that
5966 closesocket is equivalent to CloseHandle, which is to be expected
5967 because socket handles are fully fledged kernel handles. */
5968 rc = _close (fd);
5969
5970 if (rc == 0 && fd < MAXDESC)
5971 fd_info[fd].flags = 0;
5972
5973 return rc;
5974 }
5975
5976 int
5977 sys_dup (int fd)
5978 {
5979 int new_fd;
5980
5981 new_fd = _dup (fd);
5982 if (new_fd >= 0 && new_fd < MAXDESC)
5983 {
5984 /* duplicate our internal info as well */
5985 fd_info[new_fd] = fd_info[fd];
5986 }
5987 return new_fd;
5988 }
5989
5990 int
5991 sys_dup2 (int src, int dst)
5992 {
5993 int rc;
5994
5995 if (dst < 0 || dst >= MAXDESC)
5996 {
5997 errno = EBADF;
5998 return -1;
5999 }
6000
6001 /* make sure we close the destination first if it's a pipe or socket */
6002 if (src != dst && fd_info[dst].flags != 0)
6003 sys_close (dst);
6004
6005 rc = _dup2 (src, dst);
6006 if (rc == 0)
6007 {
6008 /* duplicate our internal info as well */
6009 fd_info[dst] = fd_info[src];
6010 }
6011 return rc;
6012 }
6013
6014 /* Unix pipe() has only one arg */
6015 int
6016 sys_pipe (int * phandles)
6017 {
6018 int rc;
6019 unsigned flags;
6020
6021 /* make pipe handles non-inheritable; when we spawn a child, we
6022 replace the relevant handle with an inheritable one. Also put
6023 pipes into binary mode; we will do text mode translation ourselves
6024 if required. */
6025 rc = _pipe (phandles, 0, _O_NOINHERIT | _O_BINARY);
6026
6027 if (rc == 0)
6028 {
6029 /* Protect against overflow, since Windows can open more handles than
6030 our fd_info array has room for. */
6031 if (phandles[0] >= MAXDESC || phandles[1] >= MAXDESC)
6032 {
6033 _close (phandles[0]);
6034 _close (phandles[1]);
6035 rc = -1;
6036 }
6037 else
6038 {
6039 flags = FILE_PIPE | FILE_READ | FILE_BINARY;
6040 fd_info[phandles[0]].flags = flags;
6041
6042 flags = FILE_PIPE | FILE_WRITE | FILE_BINARY;
6043 fd_info[phandles[1]].flags = flags;
6044 }
6045 }
6046
6047 return rc;
6048 }
6049
6050 /* Function to do blocking read of one byte, needed to implement
6051 select. It is only allowed on sockets and pipes. */
6052 int
6053 _sys_read_ahead (int fd)
6054 {
6055 child_process * cp;
6056 int rc;
6057
6058 if (fd < 0 || fd >= MAXDESC)
6059 return STATUS_READ_ERROR;
6060
6061 cp = fd_info[fd].cp;
6062
6063 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
6064 return STATUS_READ_ERROR;
6065
6066 if ((fd_info[fd].flags & (FILE_PIPE | FILE_SERIAL | FILE_SOCKET)) == 0
6067 || (fd_info[fd].flags & FILE_READ) == 0)
6068 {
6069 DebPrint (("_sys_read_ahead: internal error: fd %d is not a pipe, serial port, or socket!\n", fd));
6070 abort ();
6071 }
6072
6073 cp->status = STATUS_READ_IN_PROGRESS;
6074
6075 if (fd_info[fd].flags & FILE_PIPE)
6076 {
6077 rc = _read (fd, &cp->chr, sizeof (char));
6078
6079 /* Give subprocess time to buffer some more output for us before
6080 reporting that input is available; we need this because Windows 95
6081 connects DOS programs to pipes by making the pipe appear to be
6082 the normal console stdout - as a result most DOS programs will
6083 write to stdout without buffering, ie. one character at a
6084 time. Even some W32 programs do this - "dir" in a command
6085 shell on NT is very slow if we don't do this. */
6086 if (rc > 0)
6087 {
6088 int wait = w32_pipe_read_delay;
6089
6090 if (wait > 0)
6091 Sleep (wait);
6092 else if (wait < 0)
6093 while (++wait <= 0)
6094 /* Yield remainder of our time slice, effectively giving a
6095 temporary priority boost to the child process. */
6096 Sleep (0);
6097 }
6098 }
6099 else if (fd_info[fd].flags & FILE_SERIAL)
6100 {
6101 HANDLE hnd = fd_info[fd].hnd;
6102 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
6103 COMMTIMEOUTS ct;
6104
6105 /* Configure timeouts for blocking read. */
6106 if (!GetCommTimeouts (hnd, &ct))
6107 return STATUS_READ_ERROR;
6108 ct.ReadIntervalTimeout = 0;
6109 ct.ReadTotalTimeoutMultiplier = 0;
6110 ct.ReadTotalTimeoutConstant = 0;
6111 if (!SetCommTimeouts (hnd, &ct))
6112 return STATUS_READ_ERROR;
6113
6114 if (!ReadFile (hnd, &cp->chr, sizeof (char), (DWORD*) &rc, ovl))
6115 {
6116 if (GetLastError () != ERROR_IO_PENDING)
6117 return STATUS_READ_ERROR;
6118 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
6119 return STATUS_READ_ERROR;
6120 }
6121 }
6122 else if (fd_info[fd].flags & FILE_SOCKET)
6123 {
6124 unsigned long nblock = 0;
6125 /* We always want this to block, so temporarily disable NDELAY. */
6126 if (fd_info[fd].flags & FILE_NDELAY)
6127 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6128
6129 rc = pfn_recv (SOCK_HANDLE (fd), &cp->chr, sizeof (char), 0);
6130
6131 if (fd_info[fd].flags & FILE_NDELAY)
6132 {
6133 nblock = 1;
6134 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6135 }
6136 }
6137
6138 if (rc == sizeof (char))
6139 cp->status = STATUS_READ_SUCCEEDED;
6140 else
6141 cp->status = STATUS_READ_FAILED;
6142
6143 return cp->status;
6144 }
6145
6146 int
6147 _sys_wait_accept (int fd)
6148 {
6149 HANDLE hEv;
6150 child_process * cp;
6151 int rc;
6152
6153 if (fd < 0 || fd >= MAXDESC)
6154 return STATUS_READ_ERROR;
6155
6156 cp = fd_info[fd].cp;
6157
6158 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
6159 return STATUS_READ_ERROR;
6160
6161 cp->status = STATUS_READ_FAILED;
6162
6163 hEv = pfn_WSACreateEvent ();
6164 rc = pfn_WSAEventSelect (SOCK_HANDLE (fd), hEv, FD_ACCEPT);
6165 if (rc != SOCKET_ERROR)
6166 {
6167 rc = WaitForSingleObject (hEv, INFINITE);
6168 pfn_WSAEventSelect (SOCK_HANDLE (fd), NULL, 0);
6169 if (rc == WAIT_OBJECT_0)
6170 cp->status = STATUS_READ_SUCCEEDED;
6171 }
6172 pfn_WSACloseEvent (hEv);
6173
6174 return cp->status;
6175 }
6176
6177 int
6178 sys_read (int fd, char * buffer, unsigned int count)
6179 {
6180 int nchars;
6181 int to_read;
6182 DWORD waiting;
6183 char * orig_buffer = buffer;
6184
6185 if (fd < 0)
6186 {
6187 errno = EBADF;
6188 return -1;
6189 }
6190
6191 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
6192 {
6193 child_process *cp = fd_info[fd].cp;
6194
6195 if ((fd_info[fd].flags & FILE_READ) == 0)
6196 {
6197 errno = EBADF;
6198 return -1;
6199 }
6200
6201 nchars = 0;
6202
6203 /* re-read CR carried over from last read */
6204 if (fd_info[fd].flags & FILE_LAST_CR)
6205 {
6206 if (fd_info[fd].flags & FILE_BINARY) abort ();
6207 *buffer++ = 0x0d;
6208 count--;
6209 nchars++;
6210 fd_info[fd].flags &= ~FILE_LAST_CR;
6211 }
6212
6213 /* presence of a child_process structure means we are operating in
6214 non-blocking mode - otherwise we just call _read directly.
6215 Note that the child_process structure might be missing because
6216 reap_subprocess has been called; in this case the pipe is
6217 already broken, so calling _read on it is okay. */
6218 if (cp)
6219 {
6220 int current_status = cp->status;
6221
6222 switch (current_status)
6223 {
6224 case STATUS_READ_FAILED:
6225 case STATUS_READ_ERROR:
6226 /* report normal EOF if nothing in buffer */
6227 if (nchars <= 0)
6228 fd_info[fd].flags |= FILE_AT_EOF;
6229 return nchars;
6230
6231 case STATUS_READ_READY:
6232 case STATUS_READ_IN_PROGRESS:
6233 DebPrint (("sys_read called when read is in progress\n"));
6234 errno = EWOULDBLOCK;
6235 return -1;
6236
6237 case STATUS_READ_SUCCEEDED:
6238 /* consume read-ahead char */
6239 *buffer++ = cp->chr;
6240 count--;
6241 nchars++;
6242 cp->status = STATUS_READ_ACKNOWLEDGED;
6243 ResetEvent (cp->char_avail);
6244
6245 case STATUS_READ_ACKNOWLEDGED:
6246 break;
6247
6248 default:
6249 DebPrint (("sys_read: bad status %d\n", current_status));
6250 errno = EBADF;
6251 return -1;
6252 }
6253
6254 if (fd_info[fd].flags & FILE_PIPE)
6255 {
6256 PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
6257 to_read = min (waiting, (DWORD) count);
6258
6259 if (to_read > 0)
6260 nchars += _read (fd, buffer, to_read);
6261 }
6262 else if (fd_info[fd].flags & FILE_SERIAL)
6263 {
6264 HANDLE hnd = fd_info[fd].hnd;
6265 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
6266 int rc = 0;
6267 COMMTIMEOUTS ct;
6268
6269 if (count > 0)
6270 {
6271 /* Configure timeouts for non-blocking read. */
6272 if (!GetCommTimeouts (hnd, &ct))
6273 {
6274 errno = EIO;
6275 return -1;
6276 }
6277 ct.ReadIntervalTimeout = MAXDWORD;
6278 ct.ReadTotalTimeoutMultiplier = 0;
6279 ct.ReadTotalTimeoutConstant = 0;
6280 if (!SetCommTimeouts (hnd, &ct))
6281 {
6282 errno = EIO;
6283 return -1;
6284 }
6285
6286 if (!ResetEvent (ovl->hEvent))
6287 {
6288 errno = EIO;
6289 return -1;
6290 }
6291 if (!ReadFile (hnd, buffer, count, (DWORD*) &rc, ovl))
6292 {
6293 if (GetLastError () != ERROR_IO_PENDING)
6294 {
6295 errno = EIO;
6296 return -1;
6297 }
6298 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
6299 {
6300 errno = EIO;
6301 return -1;
6302 }
6303 }
6304 nchars += rc;
6305 }
6306 }
6307 else /* FILE_SOCKET */
6308 {
6309 if (winsock_lib == NULL) abort ();
6310
6311 /* do the equivalent of a non-blocking read */
6312 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONREAD, &waiting);
6313 if (waiting == 0 && nchars == 0)
6314 {
6315 h_errno = errno = EWOULDBLOCK;
6316 return -1;
6317 }
6318
6319 if (waiting)
6320 {
6321 /* always use binary mode for sockets */
6322 int res = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
6323 if (res == SOCKET_ERROR)
6324 {
6325 DebPrint (("sys_read.recv failed with error %d on socket %ld\n",
6326 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
6327 set_errno ();
6328 return -1;
6329 }
6330 nchars += res;
6331 }
6332 }
6333 }
6334 else
6335 {
6336 int nread = _read (fd, buffer, count);
6337 if (nread >= 0)
6338 nchars += nread;
6339 else if (nchars == 0)
6340 nchars = nread;
6341 }
6342
6343 if (nchars <= 0)
6344 fd_info[fd].flags |= FILE_AT_EOF;
6345 /* Perform text mode translation if required. */
6346 else if ((fd_info[fd].flags & FILE_BINARY) == 0)
6347 {
6348 nchars = crlf_to_lf (nchars, orig_buffer);
6349 /* If buffer contains only CR, return that. To be absolutely
6350 sure we should attempt to read the next char, but in
6351 practice a CR to be followed by LF would not appear by
6352 itself in the buffer. */
6353 if (nchars > 1 && orig_buffer[nchars - 1] == 0x0d)
6354 {
6355 fd_info[fd].flags |= FILE_LAST_CR;
6356 nchars--;
6357 }
6358 }
6359 }
6360 else
6361 nchars = _read (fd, buffer, count);
6362
6363 return nchars;
6364 }
6365
6366 /* From w32xfns.c */
6367 extern HANDLE interrupt_handle;
6368
6369 /* For now, don't bother with a non-blocking mode */
6370 int
6371 sys_write (int fd, const void * buffer, unsigned int count)
6372 {
6373 int nchars;
6374
6375 if (fd < 0)
6376 {
6377 errno = EBADF;
6378 return -1;
6379 }
6380
6381 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
6382 {
6383 if ((fd_info[fd].flags & FILE_WRITE) == 0)
6384 {
6385 errno = EBADF;
6386 return -1;
6387 }
6388
6389 /* Perform text mode translation if required. */
6390 if ((fd_info[fd].flags & FILE_BINARY) == 0)
6391 {
6392 char * tmpbuf = alloca (count * 2);
6393 unsigned char * src = (void *)buffer;
6394 unsigned char * dst = tmpbuf;
6395 int nbytes = count;
6396
6397 while (1)
6398 {
6399 unsigned char *next;
6400 /* copy next line or remaining bytes */
6401 next = _memccpy (dst, src, '\n', nbytes);
6402 if (next)
6403 {
6404 /* copied one line ending with '\n' */
6405 int copied = next - dst;
6406 nbytes -= copied;
6407 src += copied;
6408 /* insert '\r' before '\n' */
6409 next[-1] = '\r';
6410 next[0] = '\n';
6411 dst = next + 1;
6412 count++;
6413 }
6414 else
6415 /* copied remaining partial line -> now finished */
6416 break;
6417 }
6418 buffer = tmpbuf;
6419 }
6420 }
6421
6422 if (fd < MAXDESC && fd_info[fd].flags & FILE_SERIAL)
6423 {
6424 HANDLE hnd = (HANDLE) _get_osfhandle (fd);
6425 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_write;
6426 HANDLE wait_hnd[2] = { interrupt_handle, ovl->hEvent };
6427 DWORD active = 0;
6428
6429 if (!WriteFile (hnd, buffer, count, (DWORD*) &nchars, ovl))
6430 {
6431 if (GetLastError () != ERROR_IO_PENDING)
6432 {
6433 errno = EIO;
6434 return -1;
6435 }
6436 if (detect_input_pending ())
6437 active = MsgWaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE,
6438 QS_ALLINPUT);
6439 else
6440 active = WaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE);
6441 if (active == WAIT_OBJECT_0)
6442 { /* User pressed C-g, cancel write, then leave. Don't bother
6443 cleaning up as we may only get stuck in buggy drivers. */
6444 PurgeComm (hnd, PURGE_TXABORT | PURGE_TXCLEAR);
6445 CancelIo (hnd);
6446 errno = EIO;
6447 return -1;
6448 }
6449 if (active == WAIT_OBJECT_0 + 1
6450 && !GetOverlappedResult (hnd, ovl, (DWORD*) &nchars, TRUE))
6451 {
6452 errno = EIO;
6453 return -1;
6454 }
6455 }
6456 }
6457 else if (fd < MAXDESC && fd_info[fd].flags & FILE_SOCKET)
6458 {
6459 unsigned long nblock = 0;
6460 if (winsock_lib == NULL) abort ();
6461
6462 /* TODO: implement select() properly so non-blocking I/O works. */
6463 /* For now, make sure the write blocks. */
6464 if (fd_info[fd].flags & FILE_NDELAY)
6465 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6466
6467 nchars = pfn_send (SOCK_HANDLE (fd), buffer, count, 0);
6468
6469 /* Set the socket back to non-blocking if it was before,
6470 for other operations that support it. */
6471 if (fd_info[fd].flags & FILE_NDELAY)
6472 {
6473 nblock = 1;
6474 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6475 }
6476
6477 if (nchars == SOCKET_ERROR)
6478 {
6479 DebPrint (("sys_write.send failed with error %d on socket %ld\n",
6480 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
6481 set_errno ();
6482 }
6483 }
6484 else
6485 {
6486 /* Some networked filesystems don't like too large writes, so
6487 break them into smaller chunks. See the Comments section of
6488 the MSDN documentation of WriteFile for details behind the
6489 choice of the value of CHUNK below. See also the thread
6490 http://thread.gmane.org/gmane.comp.version-control.git/145294
6491 in the git mailing list. */
6492 const unsigned char *p = buffer;
6493 const unsigned chunk = 30 * 1024 * 1024;
6494
6495 nchars = 0;
6496 while (count > 0)
6497 {
6498 unsigned this_chunk = count < chunk ? count : chunk;
6499 int n = _write (fd, p, this_chunk);
6500
6501 nchars += n;
6502 if (n < 0)
6503 {
6504 nchars = n;
6505 break;
6506 }
6507 else if (n < this_chunk)
6508 break;
6509 count -= n;
6510 p += n;
6511 }
6512 }
6513
6514 return nchars;
6515 }
6516
6517 /* The Windows CRT functions are "optimized for speed", so they don't
6518 check for timezone and DST changes if they were last called less
6519 than 1 minute ago (see http://support.microsoft.com/kb/821231). So
6520 all Emacs features that repeatedly call time functions (e.g.,
6521 display-time) are in real danger of missing timezone and DST
6522 changes. Calling tzset before each localtime call fixes that. */
6523 struct tm *
6524 sys_localtime (const time_t *t)
6525 {
6526 tzset ();
6527 return localtime (t);
6528 }
6529
6530
6531 \f
6532 /* Delayed loading of libraries. */
6533
6534 Lisp_Object Vlibrary_cache;
6535
6536 /* The argument LIBRARIES is an alist that associates a symbol
6537 LIBRARY_ID, identifying an external DLL library known to Emacs, to
6538 a list of filenames under which the library is usually found. In
6539 most cases, the argument passed as LIBRARIES is the variable
6540 `dynamic-library-alist', which is initialized to a list of common
6541 library names. If the function loads the library successfully, it
6542 returns the handle of the DLL, and records the filename in the
6543 property :loaded-from of LIBRARY_ID; it returns NULL if the library
6544 could not be found, or when it was already loaded (because the
6545 handle is not recorded anywhere, and so is lost after use). It
6546 would be trivial to save the handle too in :loaded-from, but
6547 currently there's no use case for it. */
6548 HMODULE
6549 w32_delayed_load (Lisp_Object libraries, Lisp_Object library_id)
6550 {
6551 HMODULE library_dll = NULL;
6552
6553 CHECK_SYMBOL (library_id);
6554
6555 if (CONSP (libraries) && NILP (Fassq (library_id, Vlibrary_cache)))
6556 {
6557 Lisp_Object found = Qnil;
6558 Lisp_Object dlls = Fassq (library_id, libraries);
6559
6560 if (CONSP (dlls))
6561 for (dlls = XCDR (dlls); CONSP (dlls); dlls = XCDR (dlls))
6562 {
6563 CHECK_STRING_CAR (dlls);
6564 if ((library_dll = LoadLibrary (SDATA (XCAR (dlls)))))
6565 {
6566 char name[MAX_PATH];
6567 DWORD len;
6568
6569 len = GetModuleFileNameA (library_dll, name, sizeof (name));
6570 found = Fcons (XCAR (dlls),
6571 (len > 0)
6572 /* Possibly truncated */
6573 ? make_specified_string (name, -1, len, 1)
6574 : Qnil);
6575 break;
6576 }
6577 }
6578
6579 Fput (library_id, QCloaded_from, found);
6580 }
6581
6582 return library_dll;
6583 }
6584
6585 \f
6586 void
6587 check_windows_init_file (void)
6588 {
6589 /* A common indication that Emacs is not installed properly is when
6590 it cannot find the Windows installation file. If this file does
6591 not exist in the expected place, tell the user. */
6592
6593 if (!noninteractive && !inhibit_window_system
6594 /* Vload_path is not yet initialized when we are loading
6595 loadup.el. */
6596 && NILP (Vpurify_flag))
6597 {
6598 Lisp_Object init_file;
6599 int fd;
6600
6601 init_file = build_string ("term/w32-win");
6602 fd = openp (Vload_path, init_file, Fget_load_suffixes (), NULL, Qnil);
6603 if (fd < 0)
6604 {
6605 Lisp_Object load_path_print = Fprin1_to_string (Vload_path, Qnil);
6606 char *init_file_name = SDATA (init_file);
6607 char *load_path = SDATA (load_path_print);
6608 char *buffer = alloca (1024
6609 + strlen (init_file_name)
6610 + strlen (load_path));
6611
6612 sprintf (buffer,
6613 "The Emacs Windows initialization file \"%s.el\" "
6614 "could not be found in your Emacs installation. "
6615 "Emacs checked the following directories for this file:\n"
6616 "\n%s\n\n"
6617 "When Emacs cannot find this file, it usually means that it "
6618 "was not installed properly, or its distribution file was "
6619 "not unpacked properly.\nSee the README.W32 file in the "
6620 "top-level Emacs directory for more information.",
6621 init_file_name, load_path);
6622 MessageBox (NULL,
6623 buffer,
6624 "Emacs Abort Dialog",
6625 MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
6626 /* Use the low-level Emacs abort. */
6627 #undef abort
6628 abort ();
6629 }
6630 else
6631 {
6632 _close (fd);
6633 }
6634 }
6635 }
6636
6637 void
6638 term_ntproc (void)
6639 {
6640 /* shutdown the socket interface if necessary */
6641 term_winsock ();
6642
6643 term_w32select ();
6644 }
6645
6646 void
6647 init_ntproc (void)
6648 {
6649 /* Initialize the socket interface now if available and requested by
6650 the user by defining PRELOAD_WINSOCK; otherwise loading will be
6651 delayed until open-network-stream is called (w32-has-winsock can
6652 also be used to dynamically load or reload winsock).
6653
6654 Conveniently, init_environment is called before us, so
6655 PRELOAD_WINSOCK can be set in the registry. */
6656
6657 /* Always initialize this correctly. */
6658 winsock_lib = NULL;
6659
6660 if (getenv ("PRELOAD_WINSOCK") != NULL)
6661 init_winsock (TRUE);
6662
6663 /* Initial preparation for subprocess support: replace our standard
6664 handles with non-inheritable versions. */
6665 {
6666 HANDLE parent;
6667 HANDLE stdin_save = INVALID_HANDLE_VALUE;
6668 HANDLE stdout_save = INVALID_HANDLE_VALUE;
6669 HANDLE stderr_save = INVALID_HANDLE_VALUE;
6670
6671 parent = GetCurrentProcess ();
6672
6673 /* ignore errors when duplicating and closing; typically the
6674 handles will be invalid when running as a gui program. */
6675 DuplicateHandle (parent,
6676 GetStdHandle (STD_INPUT_HANDLE),
6677 parent,
6678 &stdin_save,
6679 0,
6680 FALSE,
6681 DUPLICATE_SAME_ACCESS);
6682
6683 DuplicateHandle (parent,
6684 GetStdHandle (STD_OUTPUT_HANDLE),
6685 parent,
6686 &stdout_save,
6687 0,
6688 FALSE,
6689 DUPLICATE_SAME_ACCESS);
6690
6691 DuplicateHandle (parent,
6692 GetStdHandle (STD_ERROR_HANDLE),
6693 parent,
6694 &stderr_save,
6695 0,
6696 FALSE,
6697 DUPLICATE_SAME_ACCESS);
6698
6699 fclose (stdin);
6700 fclose (stdout);
6701 fclose (stderr);
6702
6703 if (stdin_save != INVALID_HANDLE_VALUE)
6704 _open_osfhandle ((long) stdin_save, O_TEXT);
6705 else
6706 _open ("nul", O_TEXT | O_NOINHERIT | O_RDONLY);
6707 _fdopen (0, "r");
6708
6709 if (stdout_save != INVALID_HANDLE_VALUE)
6710 _open_osfhandle ((long) stdout_save, O_TEXT);
6711 else
6712 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
6713 _fdopen (1, "w");
6714
6715 if (stderr_save != INVALID_HANDLE_VALUE)
6716 _open_osfhandle ((long) stderr_save, O_TEXT);
6717 else
6718 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
6719 _fdopen (2, "w");
6720 }
6721
6722 /* unfortunately, atexit depends on implementation of malloc */
6723 /* atexit (term_ntproc); */
6724 signal (SIGABRT, term_ntproc);
6725
6726 /* determine which drives are fixed, for GetCachedVolumeInformation */
6727 {
6728 /* GetDriveType must have trailing backslash. */
6729 char drive[] = "A:\\";
6730
6731 /* Loop over all possible drive letters */
6732 while (*drive <= 'Z')
6733 {
6734 /* Record if this drive letter refers to a fixed drive. */
6735 fixed_drives[DRIVE_INDEX (*drive)] =
6736 (GetDriveType (drive) == DRIVE_FIXED);
6737
6738 (*drive)++;
6739 }
6740
6741 /* Reset the volume info cache. */
6742 volume_cache = NULL;
6743 }
6744 }
6745
6746 /*
6747 shutdown_handler ensures that buffers' autosave files are
6748 up to date when the user logs off, or the system shuts down.
6749 */
6750 static BOOL WINAPI
6751 shutdown_handler (DWORD type)
6752 {
6753 /* Ctrl-C and Ctrl-Break are already suppressed, so don't handle them. */
6754 if (type == CTRL_CLOSE_EVENT /* User closes console window. */
6755 || type == CTRL_LOGOFF_EVENT /* User logs off. */
6756 || type == CTRL_SHUTDOWN_EVENT) /* User shutsdown. */
6757 {
6758 /* Shut down cleanly, making sure autosave files are up to date. */
6759 shut_down_emacs (0, 0, Qnil);
6760 }
6761
6762 /* Allow other handlers to handle this signal. */
6763 return FALSE;
6764 }
6765
6766 /*
6767 globals_of_w32 is used to initialize those global variables that
6768 must always be initialized on startup even when the global variable
6769 initialized is non zero (see the function main in emacs.c).
6770 */
6771 void
6772 globals_of_w32 (void)
6773 {
6774 HMODULE kernel32 = GetModuleHandle ("kernel32.dll");
6775
6776 get_process_times_fn = (GetProcessTimes_Proc)
6777 GetProcAddress (kernel32, "GetProcessTimes");
6778
6779 DEFSYM (QCloaded_from, ":loaded-from");
6780
6781 Vlibrary_cache = Qnil;
6782 staticpro (&Vlibrary_cache);
6783
6784 g_b_init_is_windows_9x = 0;
6785 g_b_init_open_process_token = 0;
6786 g_b_init_get_token_information = 0;
6787 g_b_init_lookup_account_sid = 0;
6788 g_b_init_get_sid_sub_authority = 0;
6789 g_b_init_get_sid_sub_authority_count = 0;
6790 g_b_init_get_security_info = 0;
6791 g_b_init_get_file_security = 0;
6792 g_b_init_get_security_descriptor_owner = 0;
6793 g_b_init_get_security_descriptor_group = 0;
6794 g_b_init_is_valid_sid = 0;
6795 g_b_init_create_toolhelp32_snapshot = 0;
6796 g_b_init_process32_first = 0;
6797 g_b_init_process32_next = 0;
6798 g_b_init_open_thread_token = 0;
6799 g_b_init_impersonate_self = 0;
6800 g_b_init_revert_to_self = 0;
6801 g_b_init_get_process_memory_info = 0;
6802 g_b_init_get_process_working_set_size = 0;
6803 g_b_init_global_memory_status = 0;
6804 g_b_init_global_memory_status_ex = 0;
6805 g_b_init_equal_sid = 0;
6806 g_b_init_copy_sid = 0;
6807 g_b_init_get_length_sid = 0;
6808 g_b_init_get_native_system_info = 0;
6809 g_b_init_get_system_times = 0;
6810 g_b_init_create_symbolic_link = 0;
6811 num_of_processors = 0;
6812 /* The following sets a handler for shutdown notifications for
6813 console apps. This actually applies to Emacs in both console and
6814 GUI modes, since we had to fool windows into thinking emacs is a
6815 console application to get console mode to work. */
6816 SetConsoleCtrlHandler (shutdown_handler, TRUE);
6817
6818 /* "None" is the default group name on standalone workstations. */
6819 strcpy (dflt_group_name, "None");
6820 }
6821
6822 /* For make-serial-process */
6823 int
6824 serial_open (char *port)
6825 {
6826 HANDLE hnd;
6827 child_process *cp;
6828 int fd = -1;
6829
6830 hnd = CreateFile (port, GENERIC_READ | GENERIC_WRITE, 0, 0,
6831 OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
6832 if (hnd == INVALID_HANDLE_VALUE)
6833 error ("Could not open %s", port);
6834 fd = (int) _open_osfhandle ((int) hnd, 0);
6835 if (fd == -1)
6836 error ("Could not open %s", port);
6837
6838 cp = new_child ();
6839 if (!cp)
6840 error ("Could not create child process");
6841 cp->fd = fd;
6842 cp->status = STATUS_READ_ACKNOWLEDGED;
6843 fd_info[ fd ].hnd = hnd;
6844 fd_info[ fd ].flags |=
6845 FILE_READ | FILE_WRITE | FILE_BINARY | FILE_SERIAL;
6846 if (fd_info[ fd ].cp != NULL)
6847 {
6848 error ("fd_info[fd = %d] is already in use", fd);
6849 }
6850 fd_info[ fd ].cp = cp;
6851 cp->ovl_read.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
6852 if (cp->ovl_read.hEvent == NULL)
6853 error ("Could not create read event");
6854 cp->ovl_write.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
6855 if (cp->ovl_write.hEvent == NULL)
6856 error ("Could not create write event");
6857
6858 return fd;
6859 }
6860
6861 /* For serial-process-configure */
6862 void
6863 serial_configure (struct Lisp_Process *p, Lisp_Object contact)
6864 {
6865 Lisp_Object childp2 = Qnil;
6866 Lisp_Object tem = Qnil;
6867 HANDLE hnd;
6868 DCB dcb;
6869 COMMTIMEOUTS ct;
6870 char summary[4] = "???"; /* This usually becomes "8N1". */
6871
6872 if ((fd_info[ p->outfd ].flags & FILE_SERIAL) == 0)
6873 error ("Not a serial process");
6874 hnd = fd_info[ p->outfd ].hnd;
6875
6876 childp2 = Fcopy_sequence (p->childp);
6877
6878 /* Initialize timeouts for blocking read and blocking write. */
6879 if (!GetCommTimeouts (hnd, &ct))
6880 error ("GetCommTimeouts() failed");
6881 ct.ReadIntervalTimeout = 0;
6882 ct.ReadTotalTimeoutMultiplier = 0;
6883 ct.ReadTotalTimeoutConstant = 0;
6884 ct.WriteTotalTimeoutMultiplier = 0;
6885 ct.WriteTotalTimeoutConstant = 0;
6886 if (!SetCommTimeouts (hnd, &ct))
6887 error ("SetCommTimeouts() failed");
6888 /* Read port attributes and prepare default configuration. */
6889 memset (&dcb, 0, sizeof (dcb));
6890 dcb.DCBlength = sizeof (DCB);
6891 if (!GetCommState (hnd, &dcb))
6892 error ("GetCommState() failed");
6893 dcb.fBinary = TRUE;
6894 dcb.fNull = FALSE;
6895 dcb.fAbortOnError = FALSE;
6896 /* dcb.XonLim and dcb.XoffLim are set by GetCommState() */
6897 dcb.ErrorChar = 0;
6898 dcb.EofChar = 0;
6899 dcb.EvtChar = 0;
6900
6901 /* Configure speed. */
6902 if (!NILP (Fplist_member (contact, QCspeed)))
6903 tem = Fplist_get (contact, QCspeed);
6904 else
6905 tem = Fplist_get (p->childp, QCspeed);
6906 CHECK_NUMBER (tem);
6907 dcb.BaudRate = XINT (tem);
6908 childp2 = Fplist_put (childp2, QCspeed, tem);
6909
6910 /* Configure bytesize. */
6911 if (!NILP (Fplist_member (contact, QCbytesize)))
6912 tem = Fplist_get (contact, QCbytesize);
6913 else
6914 tem = Fplist_get (p->childp, QCbytesize);
6915 if (NILP (tem))
6916 tem = make_number (8);
6917 CHECK_NUMBER (tem);
6918 if (XINT (tem) != 7 && XINT (tem) != 8)
6919 error (":bytesize must be nil (8), 7, or 8");
6920 dcb.ByteSize = XINT (tem);
6921 summary[0] = XINT (tem) + '0';
6922 childp2 = Fplist_put (childp2, QCbytesize, tem);
6923
6924 /* Configure parity. */
6925 if (!NILP (Fplist_member (contact, QCparity)))
6926 tem = Fplist_get (contact, QCparity);
6927 else
6928 tem = Fplist_get (p->childp, QCparity);
6929 if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
6930 error (":parity must be nil (no parity), `even', or `odd'");
6931 dcb.fParity = FALSE;
6932 dcb.Parity = NOPARITY;
6933 dcb.fErrorChar = FALSE;
6934 if (NILP (tem))
6935 {
6936 summary[1] = 'N';
6937 }
6938 else if (EQ (tem, Qeven))
6939 {
6940 summary[1] = 'E';
6941 dcb.fParity = TRUE;
6942 dcb.Parity = EVENPARITY;
6943 dcb.fErrorChar = TRUE;
6944 }
6945 else if (EQ (tem, Qodd))
6946 {
6947 summary[1] = 'O';
6948 dcb.fParity = TRUE;
6949 dcb.Parity = ODDPARITY;
6950 dcb.fErrorChar = TRUE;
6951 }
6952 childp2 = Fplist_put (childp2, QCparity, tem);
6953
6954 /* Configure stopbits. */
6955 if (!NILP (Fplist_member (contact, QCstopbits)))
6956 tem = Fplist_get (contact, QCstopbits);
6957 else
6958 tem = Fplist_get (p->childp, QCstopbits);
6959 if (NILP (tem))
6960 tem = make_number (1);
6961 CHECK_NUMBER (tem);
6962 if (XINT (tem) != 1 && XINT (tem) != 2)
6963 error (":stopbits must be nil (1 stopbit), 1, or 2");
6964 summary[2] = XINT (tem) + '0';
6965 if (XINT (tem) == 1)
6966 dcb.StopBits = ONESTOPBIT;
6967 else if (XINT (tem) == 2)
6968 dcb.StopBits = TWOSTOPBITS;
6969 childp2 = Fplist_put (childp2, QCstopbits, tem);
6970
6971 /* Configure flowcontrol. */
6972 if (!NILP (Fplist_member (contact, QCflowcontrol)))
6973 tem = Fplist_get (contact, QCflowcontrol);
6974 else
6975 tem = Fplist_get (p->childp, QCflowcontrol);
6976 if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
6977 error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
6978 dcb.fOutxCtsFlow = FALSE;
6979 dcb.fOutxDsrFlow = FALSE;
6980 dcb.fDtrControl = DTR_CONTROL_DISABLE;
6981 dcb.fDsrSensitivity = FALSE;
6982 dcb.fTXContinueOnXoff = FALSE;
6983 dcb.fOutX = FALSE;
6984 dcb.fInX = FALSE;
6985 dcb.fRtsControl = RTS_CONTROL_DISABLE;
6986 dcb.XonChar = 17; /* Control-Q */
6987 dcb.XoffChar = 19; /* Control-S */
6988 if (NILP (tem))
6989 {
6990 /* Already configured. */
6991 }
6992 else if (EQ (tem, Qhw))
6993 {
6994 dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
6995 dcb.fOutxCtsFlow = TRUE;
6996 }
6997 else if (EQ (tem, Qsw))
6998 {
6999 dcb.fOutX = TRUE;
7000 dcb.fInX = TRUE;
7001 }
7002 childp2 = Fplist_put (childp2, QCflowcontrol, tem);
7003
7004 /* Activate configuration. */
7005 if (!SetCommState (hnd, &dcb))
7006 error ("SetCommState() failed");
7007
7008 childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
7009 pset_childp (p, childp2);
7010 }
7011
7012 #ifdef HAVE_GNUTLS
7013
7014 ssize_t
7015 emacs_gnutls_pull (gnutls_transport_ptr_t p, void* buf, size_t sz)
7016 {
7017 int n, sc, err;
7018 SELECT_TYPE fdset;
7019 struct timeval timeout;
7020 struct Lisp_Process *process = (struct Lisp_Process *)p;
7021 int fd = process->infd;
7022
7023 for (;;)
7024 {
7025 n = sys_read (fd, (char*)buf, sz);
7026
7027 if (n >= 0)
7028 return n;
7029
7030 err = errno;
7031
7032 if (err == EWOULDBLOCK)
7033 {
7034 /* Set a small timeout. */
7035 timeout.tv_sec = 1;
7036 timeout.tv_usec = 0;
7037 FD_ZERO (&fdset);
7038 FD_SET ((int)fd, &fdset);
7039
7040 /* Use select with the timeout to poll the selector. */
7041 sc = select (fd + 1, &fdset, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
7042 &timeout, NULL);
7043
7044 if (sc > 0)
7045 continue; /* Try again. */
7046
7047 /* Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN.
7048 Also accept select return 0 as an indicator to EAGAIN. */
7049 if (sc == 0 || errno == EWOULDBLOCK)
7050 err = EAGAIN;
7051 else
7052 err = errno; /* Other errors are just passed on. */
7053 }
7054
7055 emacs_gnutls_transport_set_errno (process->gnutls_state, err);
7056
7057 return -1;
7058 }
7059 }
7060
7061 ssize_t
7062 emacs_gnutls_push (gnutls_transport_ptr_t p, const void* buf, size_t sz)
7063 {
7064 struct Lisp_Process *process = (struct Lisp_Process *)p;
7065 int fd = process->outfd;
7066 ssize_t n = sys_write (fd, buf, sz);
7067
7068 /* 0 or more bytes written means everything went fine. */
7069 if (n >= 0)
7070 return n;
7071
7072 /* Negative bytes written means we got an error in errno.
7073 Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
7074 emacs_gnutls_transport_set_errno (process->gnutls_state,
7075 errno == EWOULDBLOCK ? EAGAIN : errno);
7076
7077 return -1;
7078 }
7079 #endif /* HAVE_GNUTLS */
7080
7081 /* end of w32.c */
Unnamed repository; edit this file 'description' to name the repository.