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Adapt 'utime' and enhance its error handling.
[bpt/emacs.git] / src / w32.c
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1/* Utility and Unix shadow routines for GNU Emacs on the Microsoft Windows API.
2 Copyright (C) 1994-1995, 2000-2013 Free Software Foundation, Inc.
3
4This file is part of GNU Emacs.
5
6GNU Emacs is free software: you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation, either version 3 of the License, or
9(at your option) any later version.
10
11GNU Emacs is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
18
19/*
20 Geoff Voelker (voelker@cs.washington.edu) 7-29-94
21*/
22
23#include <mingw_time.h>
24#include <stddef.h> /* for offsetof */
25#include <stdlib.h>
26#include <stdio.h>
27#include <float.h> /* for DBL_EPSILON */
28#include <io.h>
29#include <errno.h>
30#include <fcntl.h>
31#include <ctype.h>
32#include <signal.h>
33#include <sys/file.h>
34#include <time.h> /* must be before nt/inc/sys/time.h, for MinGW64 */
35#include <sys/time.h>
36#include <sys/utime.h>
37#include <math.h>
38
39/* must include CRT headers *before* config.h */
40
41#include <config.h>
42#include <mbstring.h> /* for _mbspbrk, _mbslwr, _mbsrchr, ... */
43
44#undef access
45#undef chdir
46#undef chmod
47#undef creat
48#undef ctime
49#undef fopen
50#undef link
51#undef mkdir
52#undef open
53#undef rename
54#undef rmdir
55#undef unlink
56
57#undef close
58#undef dup
59#undef dup2
60#undef pipe
61#undef read
62#undef write
63
64#undef strerror
65
66#undef localtime
67
68#include "lisp.h"
69#include "epaths.h" /* for SHELL */
70
71#include <pwd.h>
72#include <grp.h>
73
74/* MinGW64 (_W64) defines these in its _mingw.h. */
75#if defined(__GNUC__) && !defined(_W64)
76#define _ANONYMOUS_UNION
77#define _ANONYMOUS_STRUCT
78#endif
79#include <windows.h>
80/* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
81 use a different name to avoid compilation problems. */
82typedef struct _MEMORY_STATUS_EX {
83 DWORD dwLength;
84 DWORD dwMemoryLoad;
85 DWORDLONG ullTotalPhys;
86 DWORDLONG ullAvailPhys;
87 DWORDLONG ullTotalPageFile;
88 DWORDLONG ullAvailPageFile;
89 DWORDLONG ullTotalVirtual;
90 DWORDLONG ullAvailVirtual;
91 DWORDLONG ullAvailExtendedVirtual;
92} MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
93
94/* These are here so that GDB would know about these data types. This
95 allows to attach GDB to Emacs when a fatal exception is triggered
96 and Windows pops up the "application needs to be closed" dialog.
97 At that point, _gnu_exception_handler, the top-level exception
98 handler installed by the MinGW startup code, is somewhere on the
99 call-stack of the main thread, so going to that call frame and
100 looking at the argument to _gnu_exception_handler, which is a
101 PEXCEPTION_POINTERS pointer, can reveal the exception code
102 (excptr->ExceptionRecord->ExceptionCode) and the address where the
103 exception happened (excptr->ExceptionRecord->ExceptionAddress), as
104 well as some additional information specific to the exception. */
105PEXCEPTION_POINTERS excptr;
106PEXCEPTION_RECORD excprec;
107PCONTEXT ctxrec;
108
109#include <lmcons.h>
110#include <shlobj.h>
111
112#include <tlhelp32.h>
113#include <psapi.h>
114#ifndef _MSC_VER
115#include <w32api.h>
116#endif
117#if _WIN32_WINNT < 0x0500
118#if !defined (__MINGW32__) || __W32API_MAJOR_VERSION < 3 || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 15)
119/* This either is not in psapi.h or guarded by higher value of
120 _WIN32_WINNT than what we use. w32api supplied with MinGW 3.15
121 defines it in psapi.h */
122typedef struct _PROCESS_MEMORY_COUNTERS_EX {
123 DWORD cb;
124 DWORD PageFaultCount;
125 SIZE_T PeakWorkingSetSize;
126 SIZE_T WorkingSetSize;
127 SIZE_T QuotaPeakPagedPoolUsage;
128 SIZE_T QuotaPagedPoolUsage;
129 SIZE_T QuotaPeakNonPagedPoolUsage;
130 SIZE_T QuotaNonPagedPoolUsage;
131 SIZE_T PagefileUsage;
132 SIZE_T PeakPagefileUsage;
133 SIZE_T PrivateUsage;
134} PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;
135#endif
136#endif
137
138#include <winioctl.h>
139#include <aclapi.h>
140#include <sddl.h>
141
142#include <sys/acl.h>
143
144/* This is not in MinGW's sddl.h (but they are in MSVC headers), so we
145 define them by hand if not already defined. */
146#ifndef SDDL_REVISION_1
147#define SDDL_REVISION_1 1
148#endif /* SDDL_REVISION_1 */
149
150#if defined(_MSC_VER) || defined(_W64)
151/* MSVC and MinGW64 don't provide the definition of
152 REPARSE_DATA_BUFFER and the associated macros, except on ntifs.h,
153 which cannot be included because it triggers conflicts with other
154 Windows API headers. So we define it here by hand. */
155
156typedef struct _REPARSE_DATA_BUFFER {
157 ULONG ReparseTag;
158 USHORT ReparseDataLength;
159 USHORT Reserved;
160 union {
161 struct {
162 USHORT SubstituteNameOffset;
163 USHORT SubstituteNameLength;
164 USHORT PrintNameOffset;
165 USHORT PrintNameLength;
166 ULONG Flags;
167 WCHAR PathBuffer[1];
168 } SymbolicLinkReparseBuffer;
169 struct {
170 USHORT SubstituteNameOffset;
171 USHORT SubstituteNameLength;
172 USHORT PrintNameOffset;
173 USHORT PrintNameLength;
174 WCHAR PathBuffer[1];
175 } MountPointReparseBuffer;
176 struct {
177 UCHAR DataBuffer[1];
178 } GenericReparseBuffer;
179 } DUMMYUNIONNAME;
180} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
181
182#ifndef FILE_DEVICE_FILE_SYSTEM
183#define FILE_DEVICE_FILE_SYSTEM 9
184#endif
185#ifndef METHOD_BUFFERED
186#define METHOD_BUFFERED 0
187#endif
188#ifndef FILE_ANY_ACCESS
189#define FILE_ANY_ACCESS 0x00000000
190#endif
191#ifndef CTL_CODE
192#define CTL_CODE(t,f,m,a) (((t)<<16)|((a)<<14)|((f)<<2)|(m))
193#endif
194/* MinGW64 defines FSCTL_GET_REPARSE_POINT on winioctl.h. */
195#ifndef FSCTL_GET_REPARSE_POINT
196#define FSCTL_GET_REPARSE_POINT \
197 CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
198#endif
199#endif
200
201/* TCP connection support. */
202#include <sys/socket.h>
203#undef socket
204#undef bind
205#undef connect
206#undef htons
207#undef ntohs
208#undef inet_addr
209#undef gethostname
210#undef gethostbyname
211#undef getservbyname
212#undef getpeername
213#undef shutdown
214#undef setsockopt
215#undef listen
216#undef getsockname
217#undef accept
218#undef recvfrom
219#undef sendto
220
221#include <iphlpapi.h> /* should be after winsock2.h */
222
223#include "w32.h"
224#include <dirent.h>
225#include "w32common.h"
226#include "w32heap.h"
227#include "w32select.h"
228#include "systime.h"
229#include "dispextern.h" /* for xstrcasecmp */
230#include "coding.h" /* for Vlocale_coding_system */
231
232#include "careadlinkat.h"
233#include "allocator.h"
234
235/* For serial_configure and serial_open. */
236#include "process.h"
237
238typedef HRESULT (WINAPI * ShGetFolderPath_fn)
239 (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);
240
241Lisp_Object QCloaded_from;
242
243void globals_of_w32 (void);
244static DWORD get_rid (PSID);
245static int is_symlink (const char *);
246static char * chase_symlinks (const char *);
247static int enable_privilege (LPCTSTR, BOOL, TOKEN_PRIVILEGES *);
248static int restore_privilege (TOKEN_PRIVILEGES *);
249static BOOL WINAPI revert_to_self (void);
250
251static int sys_access (const char *, int);
252extern void *e_malloc (size_t);
253extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
254 struct timespec *, void *);
255extern int sys_dup (int);
256
257
258
259\f
260/* Initialization states.
261
262 WARNING: If you add any more such variables for additional APIs,
263 you MUST add initialization for them to globals_of_w32
264 below. This is because these variables might get set
265 to non-NULL values during dumping, but the dumped Emacs
266 cannot reuse those values, because it could be run on a
267 different version of the OS, where API addresses are
268 different. */
269static BOOL g_b_init_is_windows_9x;
270static BOOL g_b_init_open_process_token;
271static BOOL g_b_init_get_token_information;
272static BOOL g_b_init_lookup_account_sid;
273static BOOL g_b_init_get_sid_sub_authority;
274static BOOL g_b_init_get_sid_sub_authority_count;
275static BOOL g_b_init_get_security_info;
276static BOOL g_b_init_get_file_security;
277static BOOL g_b_init_get_security_descriptor_owner;
278static BOOL g_b_init_get_security_descriptor_group;
279static BOOL g_b_init_is_valid_sid;
280static BOOL g_b_init_create_toolhelp32_snapshot;
281static BOOL g_b_init_process32_first;
282static BOOL g_b_init_process32_next;
283static BOOL g_b_init_open_thread_token;
284static BOOL g_b_init_impersonate_self;
285static BOOL g_b_init_revert_to_self;
286static BOOL g_b_init_get_process_memory_info;
287static BOOL g_b_init_get_process_working_set_size;
288static BOOL g_b_init_global_memory_status;
289static BOOL g_b_init_global_memory_status_ex;
290static BOOL g_b_init_get_length_sid;
291static BOOL g_b_init_equal_sid;
292static BOOL g_b_init_copy_sid;
293static BOOL g_b_init_get_native_system_info;
294static BOOL g_b_init_get_system_times;
295static BOOL g_b_init_create_symbolic_link;
296static BOOL g_b_init_get_security_descriptor_dacl;
297static BOOL g_b_init_convert_sd_to_sddl;
298static BOOL g_b_init_convert_sddl_to_sd;
299static BOOL g_b_init_is_valid_security_descriptor;
300static BOOL g_b_init_set_file_security;
301static BOOL g_b_init_get_adapters_info;
302
303/*
304 BEGIN: Wrapper functions around OpenProcessToken
305 and other functions in advapi32.dll that are only
306 supported in Windows NT / 2k / XP
307*/
308 /* ** Function pointer typedefs ** */
309typedef BOOL (WINAPI * OpenProcessToken_Proc) (
310 HANDLE ProcessHandle,
311 DWORD DesiredAccess,
312 PHANDLE TokenHandle);
313typedef BOOL (WINAPI * GetTokenInformation_Proc) (
314 HANDLE TokenHandle,
315 TOKEN_INFORMATION_CLASS TokenInformationClass,
316 LPVOID TokenInformation,
317 DWORD TokenInformationLength,
318 PDWORD ReturnLength);
319typedef BOOL (WINAPI * GetProcessTimes_Proc) (
320 HANDLE process_handle,
321 LPFILETIME creation_time,
322 LPFILETIME exit_time,
323 LPFILETIME kernel_time,
324 LPFILETIME user_time);
325
326GetProcessTimes_Proc get_process_times_fn = NULL;
327
328#ifdef _UNICODE
329const char * const LookupAccountSid_Name = "LookupAccountSidW";
330const char * const GetFileSecurity_Name = "GetFileSecurityW";
331const char * const SetFileSecurity_Name = "SetFileSecurityW";
332#else
333const char * const LookupAccountSid_Name = "LookupAccountSidA";
334const char * const GetFileSecurity_Name = "GetFileSecurityA";
335const char * const SetFileSecurity_Name = "SetFileSecurityA";
336#endif
337typedef BOOL (WINAPI * LookupAccountSid_Proc) (
338 LPCTSTR lpSystemName,
339 PSID Sid,
340 LPTSTR Name,
341 LPDWORD cbName,
342 LPTSTR DomainName,
343 LPDWORD cbDomainName,
344 PSID_NAME_USE peUse);
345typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
346 PSID pSid,
347 DWORD n);
348typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
349 PSID pSid);
350typedef DWORD (WINAPI * GetSecurityInfo_Proc) (
351 HANDLE handle,
352 SE_OBJECT_TYPE ObjectType,
353 SECURITY_INFORMATION SecurityInfo,
354 PSID *ppsidOwner,
355 PSID *ppsidGroup,
356 PACL *ppDacl,
357 PACL *ppSacl,
358 PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
359typedef BOOL (WINAPI * GetFileSecurity_Proc) (
360 LPCTSTR lpFileName,
361 SECURITY_INFORMATION RequestedInformation,
362 PSECURITY_DESCRIPTOR pSecurityDescriptor,
363 DWORD nLength,
364 LPDWORD lpnLengthNeeded);
365typedef BOOL (WINAPI *SetFileSecurity_Proc) (
366 LPCTSTR lpFileName,
367 SECURITY_INFORMATION SecurityInformation,
368 PSECURITY_DESCRIPTOR pSecurityDescriptor);
369typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
370 PSECURITY_DESCRIPTOR pSecurityDescriptor,
371 PSID *pOwner,
372 LPBOOL lpbOwnerDefaulted);
373typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
374 PSECURITY_DESCRIPTOR pSecurityDescriptor,
375 PSID *pGroup,
376 LPBOOL lpbGroupDefaulted);
377typedef BOOL (WINAPI *GetSecurityDescriptorDacl_Proc) (
378 PSECURITY_DESCRIPTOR pSecurityDescriptor,
379 LPBOOL lpbDaclPresent,
380 PACL *pDacl,
381 LPBOOL lpbDaclDefaulted);
382typedef BOOL (WINAPI * IsValidSid_Proc) (
383 PSID sid);
384typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
385 DWORD dwFlags,
386 DWORD th32ProcessID);
387typedef BOOL (WINAPI * Process32First_Proc) (
388 HANDLE hSnapshot,
389 LPPROCESSENTRY32 lppe);
390typedef BOOL (WINAPI * Process32Next_Proc) (
391 HANDLE hSnapshot,
392 LPPROCESSENTRY32 lppe);
393typedef BOOL (WINAPI * OpenThreadToken_Proc) (
394 HANDLE ThreadHandle,
395 DWORD DesiredAccess,
396 BOOL OpenAsSelf,
397 PHANDLE TokenHandle);
398typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
399 SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
400typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
401typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
402 HANDLE Process,
403 PPROCESS_MEMORY_COUNTERS ppsmemCounters,
404 DWORD cb);
405typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
406 HANDLE hProcess,
407 PSIZE_T lpMinimumWorkingSetSize,
408 PSIZE_T lpMaximumWorkingSetSize);
409typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
410 LPMEMORYSTATUS lpBuffer);
411typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
412 LPMEMORY_STATUS_EX lpBuffer);
413typedef BOOL (WINAPI * CopySid_Proc) (
414 DWORD nDestinationSidLength,
415 PSID pDestinationSid,
416 PSID pSourceSid);
417typedef BOOL (WINAPI * EqualSid_Proc) (
418 PSID pSid1,
419 PSID pSid2);
420typedef DWORD (WINAPI * GetLengthSid_Proc) (
421 PSID pSid);
422typedef void (WINAPI * GetNativeSystemInfo_Proc) (
423 LPSYSTEM_INFO lpSystemInfo);
424typedef BOOL (WINAPI * GetSystemTimes_Proc) (
425 LPFILETIME lpIdleTime,
426 LPFILETIME lpKernelTime,
427 LPFILETIME lpUserTime);
428typedef BOOLEAN (WINAPI *CreateSymbolicLink_Proc) (
429 LPTSTR lpSymlinkFileName,
430 LPTSTR lpTargetFileName,
431 DWORD dwFlags);
432typedef BOOL (WINAPI *ConvertStringSecurityDescriptorToSecurityDescriptor_Proc) (
433 LPCTSTR StringSecurityDescriptor,
434 DWORD StringSDRevision,
435 PSECURITY_DESCRIPTOR *SecurityDescriptor,
436 PULONG SecurityDescriptorSize);
437typedef BOOL (WINAPI *ConvertSecurityDescriptorToStringSecurityDescriptor_Proc) (
438 PSECURITY_DESCRIPTOR SecurityDescriptor,
439 DWORD RequestedStringSDRevision,
440 SECURITY_INFORMATION SecurityInformation,
441 LPTSTR *StringSecurityDescriptor,
442 PULONG StringSecurityDescriptorLen);
443typedef BOOL (WINAPI *IsValidSecurityDescriptor_Proc) (PSECURITY_DESCRIPTOR);
444typedef DWORD (WINAPI *GetAdaptersInfo_Proc) (
445 PIP_ADAPTER_INFO pAdapterInfo,
446 PULONG pOutBufLen);
447
448 /* ** A utility function ** */
449static BOOL
450is_windows_9x (void)
451{
452 static BOOL s_b_ret = 0;
453 OSVERSIONINFO os_ver;
454 if (g_b_init_is_windows_9x == 0)
455 {
456 g_b_init_is_windows_9x = 1;
457 ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
458 os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
459 if (GetVersionEx (&os_ver))
460 {
461 s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
462 }
463 }
464 return s_b_ret;
465}
466
467static Lisp_Object ltime (ULONGLONG);
468
469/* Get total user and system times for get-internal-run-time.
470 Returns a list of integers if the times are provided by the OS
471 (NT derivatives), otherwise it returns the result of current-time. */
472Lisp_Object
473w32_get_internal_run_time (void)
474{
475 if (get_process_times_fn)
476 {
477 FILETIME create, exit, kernel, user;
478 HANDLE proc = GetCurrentProcess ();
479 if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
480 {
481 LARGE_INTEGER user_int, kernel_int, total;
482 user_int.LowPart = user.dwLowDateTime;
483 user_int.HighPart = user.dwHighDateTime;
484 kernel_int.LowPart = kernel.dwLowDateTime;
485 kernel_int.HighPart = kernel.dwHighDateTime;
486 total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
487 return ltime (total.QuadPart);
488 }
489 }
490
491 return Fcurrent_time ();
492}
493
494 /* ** The wrapper functions ** */
495
496static BOOL WINAPI
497open_process_token (HANDLE ProcessHandle,
498 DWORD DesiredAccess,
499 PHANDLE TokenHandle)
500{
501 static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
502 HMODULE hm_advapi32 = NULL;
503 if (is_windows_9x () == TRUE)
504 {
505 return FALSE;
506 }
507 if (g_b_init_open_process_token == 0)
508 {
509 g_b_init_open_process_token = 1;
510 hm_advapi32 = LoadLibrary ("Advapi32.dll");
511 s_pfn_Open_Process_Token =
512 (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
513 }
514 if (s_pfn_Open_Process_Token == NULL)
515 {
516 return FALSE;
517 }
518 return (
519 s_pfn_Open_Process_Token (
520 ProcessHandle,
521 DesiredAccess,
522 TokenHandle)
523 );
524}
525
526static BOOL WINAPI
527get_token_information (HANDLE TokenHandle,
528 TOKEN_INFORMATION_CLASS TokenInformationClass,
529 LPVOID TokenInformation,
530 DWORD TokenInformationLength,
531 PDWORD ReturnLength)
532{
533 static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
534 HMODULE hm_advapi32 = NULL;
535 if (is_windows_9x () == TRUE)
536 {
537 return FALSE;
538 }
539 if (g_b_init_get_token_information == 0)
540 {
541 g_b_init_get_token_information = 1;
542 hm_advapi32 = LoadLibrary ("Advapi32.dll");
543 s_pfn_Get_Token_Information =
544 (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
545 }
546 if (s_pfn_Get_Token_Information == NULL)
547 {
548 return FALSE;
549 }
550 return (
551 s_pfn_Get_Token_Information (
552 TokenHandle,
553 TokenInformationClass,
554 TokenInformation,
555 TokenInformationLength,
556 ReturnLength)
557 );
558}
559
560static BOOL WINAPI
561lookup_account_sid (LPCTSTR lpSystemName,
562 PSID Sid,
563 LPTSTR Name,
564 LPDWORD cbName,
565 LPTSTR DomainName,
566 LPDWORD cbDomainName,
567 PSID_NAME_USE peUse)
568{
569 static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
570 HMODULE hm_advapi32 = NULL;
571 if (is_windows_9x () == TRUE)
572 {
573 return FALSE;
574 }
575 if (g_b_init_lookup_account_sid == 0)
576 {
577 g_b_init_lookup_account_sid = 1;
578 hm_advapi32 = LoadLibrary ("Advapi32.dll");
579 s_pfn_Lookup_Account_Sid =
580 (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
581 }
582 if (s_pfn_Lookup_Account_Sid == NULL)
583 {
584 return FALSE;
585 }
586 return (
587 s_pfn_Lookup_Account_Sid (
588 lpSystemName,
589 Sid,
590 Name,
591 cbName,
592 DomainName,
593 cbDomainName,
594 peUse)
595 );
596}
597
598static PDWORD WINAPI
599get_sid_sub_authority (PSID pSid, DWORD n)
600{
601 static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
602 static DWORD zero = 0U;
603 HMODULE hm_advapi32 = NULL;
604 if (is_windows_9x () == TRUE)
605 {
606 return &zero;
607 }
608 if (g_b_init_get_sid_sub_authority == 0)
609 {
610 g_b_init_get_sid_sub_authority = 1;
611 hm_advapi32 = LoadLibrary ("Advapi32.dll");
612 s_pfn_Get_Sid_Sub_Authority =
613 (GetSidSubAuthority_Proc) GetProcAddress (
614 hm_advapi32, "GetSidSubAuthority");
615 }
616 if (s_pfn_Get_Sid_Sub_Authority == NULL)
617 {
618 return &zero;
619 }
620 return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
621}
622
623static PUCHAR WINAPI
624get_sid_sub_authority_count (PSID pSid)
625{
626 static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
627 static UCHAR zero = 0U;
628 HMODULE hm_advapi32 = NULL;
629 if (is_windows_9x () == TRUE)
630 {
631 return &zero;
632 }
633 if (g_b_init_get_sid_sub_authority_count == 0)
634 {
635 g_b_init_get_sid_sub_authority_count = 1;
636 hm_advapi32 = LoadLibrary ("Advapi32.dll");
637 s_pfn_Get_Sid_Sub_Authority_Count =
638 (GetSidSubAuthorityCount_Proc) GetProcAddress (
639 hm_advapi32, "GetSidSubAuthorityCount");
640 }
641 if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
642 {
643 return &zero;
644 }
645 return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
646}
647
648static DWORD WINAPI
649get_security_info (HANDLE handle,
650 SE_OBJECT_TYPE ObjectType,
651 SECURITY_INFORMATION SecurityInfo,
652 PSID *ppsidOwner,
653 PSID *ppsidGroup,
654 PACL *ppDacl,
655 PACL *ppSacl,
656 PSECURITY_DESCRIPTOR *ppSecurityDescriptor)
657{
658 static GetSecurityInfo_Proc s_pfn_Get_Security_Info = NULL;
659 HMODULE hm_advapi32 = NULL;
660 if (is_windows_9x () == TRUE)
661 {
662 return FALSE;
663 }
664 if (g_b_init_get_security_info == 0)
665 {
666 g_b_init_get_security_info = 1;
667 hm_advapi32 = LoadLibrary ("Advapi32.dll");
668 s_pfn_Get_Security_Info =
669 (GetSecurityInfo_Proc) GetProcAddress (
670 hm_advapi32, "GetSecurityInfo");
671 }
672 if (s_pfn_Get_Security_Info == NULL)
673 {
674 return FALSE;
675 }
676 return (s_pfn_Get_Security_Info (handle, ObjectType, SecurityInfo,
677 ppsidOwner, ppsidGroup, ppDacl, ppSacl,
678 ppSecurityDescriptor));
679}
680
681static BOOL WINAPI
682get_file_security (LPCTSTR lpFileName,
683 SECURITY_INFORMATION RequestedInformation,
684 PSECURITY_DESCRIPTOR pSecurityDescriptor,
685 DWORD nLength,
686 LPDWORD lpnLengthNeeded)
687{
688 static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
689 HMODULE hm_advapi32 = NULL;
690 if (is_windows_9x () == TRUE)
691 {
692 errno = ENOTSUP;
693 return FALSE;
694 }
695 if (g_b_init_get_file_security == 0)
696 {
697 g_b_init_get_file_security = 1;
698 hm_advapi32 = LoadLibrary ("Advapi32.dll");
699 s_pfn_Get_File_Security =
700 (GetFileSecurity_Proc) GetProcAddress (
701 hm_advapi32, GetFileSecurity_Name);
702 }
703 if (s_pfn_Get_File_Security == NULL)
704 {
705 errno = ENOTSUP;
706 return FALSE;
707 }
708 return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
709 pSecurityDescriptor, nLength,
710 lpnLengthNeeded));
711}
712
713static BOOL WINAPI
714set_file_security (LPCTSTR lpFileName,
715 SECURITY_INFORMATION SecurityInformation,
716 PSECURITY_DESCRIPTOR pSecurityDescriptor)
717{
718 static SetFileSecurity_Proc s_pfn_Set_File_Security = NULL;
719 HMODULE hm_advapi32 = NULL;
720 if (is_windows_9x () == TRUE)
721 {
722 errno = ENOTSUP;
723 return FALSE;
724 }
725 if (g_b_init_set_file_security == 0)
726 {
727 g_b_init_set_file_security = 1;
728 hm_advapi32 = LoadLibrary ("Advapi32.dll");
729 s_pfn_Set_File_Security =
730 (SetFileSecurity_Proc) GetProcAddress (
731 hm_advapi32, SetFileSecurity_Name);
732 }
733 if (s_pfn_Set_File_Security == NULL)
734 {
735 errno = ENOTSUP;
736 return FALSE;
737 }
738 return (s_pfn_Set_File_Security (lpFileName, SecurityInformation,
739 pSecurityDescriptor));
740}
741
742static BOOL WINAPI
743get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
744 PSID *pOwner,
745 LPBOOL lpbOwnerDefaulted)
746{
747 static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
748 HMODULE hm_advapi32 = NULL;
749 if (is_windows_9x () == TRUE)
750 {
751 errno = ENOTSUP;
752 return FALSE;
753 }
754 if (g_b_init_get_security_descriptor_owner == 0)
755 {
756 g_b_init_get_security_descriptor_owner = 1;
757 hm_advapi32 = LoadLibrary ("Advapi32.dll");
758 s_pfn_Get_Security_Descriptor_Owner =
759 (GetSecurityDescriptorOwner_Proc) GetProcAddress (
760 hm_advapi32, "GetSecurityDescriptorOwner");
761 }
762 if (s_pfn_Get_Security_Descriptor_Owner == NULL)
763 {
764 errno = ENOTSUP;
765 return FALSE;
766 }
767 return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
768 lpbOwnerDefaulted));
769}
770
771static BOOL WINAPI
772get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
773 PSID *pGroup,
774 LPBOOL lpbGroupDefaulted)
775{
776 static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
777 HMODULE hm_advapi32 = NULL;
778 if (is_windows_9x () == TRUE)
779 {
780 errno = ENOTSUP;
781 return FALSE;
782 }
783 if (g_b_init_get_security_descriptor_group == 0)
784 {
785 g_b_init_get_security_descriptor_group = 1;
786 hm_advapi32 = LoadLibrary ("Advapi32.dll");
787 s_pfn_Get_Security_Descriptor_Group =
788 (GetSecurityDescriptorGroup_Proc) GetProcAddress (
789 hm_advapi32, "GetSecurityDescriptorGroup");
790 }
791 if (s_pfn_Get_Security_Descriptor_Group == NULL)
792 {
793 errno = ENOTSUP;
794 return FALSE;
795 }
796 return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
797 lpbGroupDefaulted));
798}
799
800static BOOL WINAPI
801get_security_descriptor_dacl (PSECURITY_DESCRIPTOR pSecurityDescriptor,
802 LPBOOL lpbDaclPresent,
803 PACL *pDacl,
804 LPBOOL lpbDaclDefaulted)
805{
806 static GetSecurityDescriptorDacl_Proc s_pfn_Get_Security_Descriptor_Dacl = NULL;
807 HMODULE hm_advapi32 = NULL;
808 if (is_windows_9x () == TRUE)
809 {
810 errno = ENOTSUP;
811 return FALSE;
812 }
813 if (g_b_init_get_security_descriptor_dacl == 0)
814 {
815 g_b_init_get_security_descriptor_dacl = 1;
816 hm_advapi32 = LoadLibrary ("Advapi32.dll");
817 s_pfn_Get_Security_Descriptor_Dacl =
818 (GetSecurityDescriptorDacl_Proc) GetProcAddress (
819 hm_advapi32, "GetSecurityDescriptorDacl");
820 }
821 if (s_pfn_Get_Security_Descriptor_Dacl == NULL)
822 {
823 errno = ENOTSUP;
824 return FALSE;
825 }
826 return (s_pfn_Get_Security_Descriptor_Dacl (pSecurityDescriptor,
827 lpbDaclPresent, pDacl,
828 lpbDaclDefaulted));
829}
830
831static BOOL WINAPI
832is_valid_sid (PSID sid)
833{
834 static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
835 HMODULE hm_advapi32 = NULL;
836 if (is_windows_9x () == TRUE)
837 {
838 return FALSE;
839 }
840 if (g_b_init_is_valid_sid == 0)
841 {
842 g_b_init_is_valid_sid = 1;
843 hm_advapi32 = LoadLibrary ("Advapi32.dll");
844 s_pfn_Is_Valid_Sid =
845 (IsValidSid_Proc) GetProcAddress (
846 hm_advapi32, "IsValidSid");
847 }
848 if (s_pfn_Is_Valid_Sid == NULL)
849 {
850 return FALSE;
851 }
852 return (s_pfn_Is_Valid_Sid (sid));
853}
854
855static BOOL WINAPI
856equal_sid (PSID sid1, PSID sid2)
857{
858 static EqualSid_Proc s_pfn_Equal_Sid = NULL;
859 HMODULE hm_advapi32 = NULL;
860 if (is_windows_9x () == TRUE)
861 {
862 return FALSE;
863 }
864 if (g_b_init_equal_sid == 0)
865 {
866 g_b_init_equal_sid = 1;
867 hm_advapi32 = LoadLibrary ("Advapi32.dll");
868 s_pfn_Equal_Sid =
869 (EqualSid_Proc) GetProcAddress (
870 hm_advapi32, "EqualSid");
871 }
872 if (s_pfn_Equal_Sid == NULL)
873 {
874 return FALSE;
875 }
876 return (s_pfn_Equal_Sid (sid1, sid2));
877}
878
879static DWORD WINAPI
880get_length_sid (PSID sid)
881{
882 static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
883 HMODULE hm_advapi32 = NULL;
884 if (is_windows_9x () == TRUE)
885 {
886 return 0;
887 }
888 if (g_b_init_get_length_sid == 0)
889 {
890 g_b_init_get_length_sid = 1;
891 hm_advapi32 = LoadLibrary ("Advapi32.dll");
892 s_pfn_Get_Length_Sid =
893 (GetLengthSid_Proc) GetProcAddress (
894 hm_advapi32, "GetLengthSid");
895 }
896 if (s_pfn_Get_Length_Sid == NULL)
897 {
898 return 0;
899 }
900 return (s_pfn_Get_Length_Sid (sid));
901}
902
903static BOOL WINAPI
904copy_sid (DWORD destlen, PSID dest, PSID src)
905{
906 static CopySid_Proc s_pfn_Copy_Sid = NULL;
907 HMODULE hm_advapi32 = NULL;
908 if (is_windows_9x () == TRUE)
909 {
910 return FALSE;
911 }
912 if (g_b_init_copy_sid == 0)
913 {
914 g_b_init_copy_sid = 1;
915 hm_advapi32 = LoadLibrary ("Advapi32.dll");
916 s_pfn_Copy_Sid =
917 (CopySid_Proc) GetProcAddress (
918 hm_advapi32, "CopySid");
919 }
920 if (s_pfn_Copy_Sid == NULL)
921 {
922 return FALSE;
923 }
924 return (s_pfn_Copy_Sid (destlen, dest, src));
925}
926
927/*
928 END: Wrapper functions around OpenProcessToken
929 and other functions in advapi32.dll that are only
930 supported in Windows NT / 2k / XP
931*/
932
933static void WINAPI
934get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
935{
936 static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
937 if (is_windows_9x () != TRUE)
938 {
939 if (g_b_init_get_native_system_info == 0)
940 {
941 g_b_init_get_native_system_info = 1;
942 s_pfn_Get_Native_System_Info =
943 (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
944 "GetNativeSystemInfo");
945 }
946 if (s_pfn_Get_Native_System_Info != NULL)
947 s_pfn_Get_Native_System_Info (lpSystemInfo);
948 }
949 else
950 lpSystemInfo->dwNumberOfProcessors = -1;
951}
952
953static BOOL WINAPI
954get_system_times (LPFILETIME lpIdleTime,
955 LPFILETIME lpKernelTime,
956 LPFILETIME lpUserTime)
957{
958 static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
959 if (is_windows_9x () == TRUE)
960 {
961 return FALSE;
962 }
963 if (g_b_init_get_system_times == 0)
964 {
965 g_b_init_get_system_times = 1;
966 s_pfn_Get_System_times =
967 (GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
968 "GetSystemTimes");
969 }
970 if (s_pfn_Get_System_times == NULL)
971 return FALSE;
972 return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
973}
974
975static BOOLEAN WINAPI
976create_symbolic_link (LPTSTR lpSymlinkFilename,
977 LPTSTR lpTargetFileName,
978 DWORD dwFlags)
979{
980 static CreateSymbolicLink_Proc s_pfn_Create_Symbolic_Link = NULL;
981 BOOLEAN retval;
982
983 if (is_windows_9x () == TRUE)
984 {
985 errno = ENOSYS;
986 return 0;
987 }
988 if (g_b_init_create_symbolic_link == 0)
989 {
990 g_b_init_create_symbolic_link = 1;
991#ifdef _UNICODE
992 s_pfn_Create_Symbolic_Link =
993 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
994 "CreateSymbolicLinkW");
995#else
996 s_pfn_Create_Symbolic_Link =
997 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
998 "CreateSymbolicLinkA");
999#endif
1000 }
1001 if (s_pfn_Create_Symbolic_Link == NULL)
1002 {
1003 errno = ENOSYS;
1004 return 0;
1005 }
1006
1007 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
1008 dwFlags);
1009 /* If we were denied creation of the symlink, try again after
1010 enabling the SeCreateSymbolicLinkPrivilege for our process. */
1011 if (!retval)
1012 {
1013 TOKEN_PRIVILEGES priv_current;
1014
1015 if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE, &priv_current))
1016 {
1017 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
1018 dwFlags);
1019 restore_privilege (&priv_current);
1020 revert_to_self ();
1021 }
1022 }
1023 return retval;
1024}
1025
1026static BOOL WINAPI
1027is_valid_security_descriptor (PSECURITY_DESCRIPTOR pSecurityDescriptor)
1028{
1029 static IsValidSecurityDescriptor_Proc s_pfn_Is_Valid_Security_Descriptor_Proc = NULL;
1030
1031 if (is_windows_9x () == TRUE)
1032 {
1033 errno = ENOTSUP;
1034 return FALSE;
1035 }
1036
1037 if (g_b_init_is_valid_security_descriptor == 0)
1038 {
1039 g_b_init_is_valid_security_descriptor = 1;
1040 s_pfn_Is_Valid_Security_Descriptor_Proc =
1041 (IsValidSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1042 "IsValidSecurityDescriptor");
1043 }
1044 if (s_pfn_Is_Valid_Security_Descriptor_Proc == NULL)
1045 {
1046 errno = ENOTSUP;
1047 return FALSE;
1048 }
1049
1050 return s_pfn_Is_Valid_Security_Descriptor_Proc (pSecurityDescriptor);
1051}
1052
1053static BOOL WINAPI
1054convert_sd_to_sddl (PSECURITY_DESCRIPTOR SecurityDescriptor,
1055 DWORD RequestedStringSDRevision,
1056 SECURITY_INFORMATION SecurityInformation,
1057 LPTSTR *StringSecurityDescriptor,
1058 PULONG StringSecurityDescriptorLen)
1059{
1060 static ConvertSecurityDescriptorToStringSecurityDescriptor_Proc s_pfn_Convert_SD_To_SDDL = NULL;
1061 BOOL retval;
1062
1063 if (is_windows_9x () == TRUE)
1064 {
1065 errno = ENOTSUP;
1066 return FALSE;
1067 }
1068
1069 if (g_b_init_convert_sd_to_sddl == 0)
1070 {
1071 g_b_init_convert_sd_to_sddl = 1;
1072#ifdef _UNICODE
1073 s_pfn_Convert_SD_To_SDDL =
1074 (ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1075 "ConvertSecurityDescriptorToStringSecurityDescriptorW");
1076#else
1077 s_pfn_Convert_SD_To_SDDL =
1078 (ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1079 "ConvertSecurityDescriptorToStringSecurityDescriptorA");
1080#endif
1081 }
1082 if (s_pfn_Convert_SD_To_SDDL == NULL)
1083 {
1084 errno = ENOTSUP;
1085 return FALSE;
1086 }
1087
1088 retval = s_pfn_Convert_SD_To_SDDL (SecurityDescriptor,
1089 RequestedStringSDRevision,
1090 SecurityInformation,
1091 StringSecurityDescriptor,
1092 StringSecurityDescriptorLen);
1093
1094 return retval;
1095}
1096
1097static BOOL WINAPI
1098convert_sddl_to_sd (LPCTSTR StringSecurityDescriptor,
1099 DWORD StringSDRevision,
1100 PSECURITY_DESCRIPTOR *SecurityDescriptor,
1101 PULONG SecurityDescriptorSize)
1102{
1103 static ConvertStringSecurityDescriptorToSecurityDescriptor_Proc s_pfn_Convert_SDDL_To_SD = NULL;
1104 BOOL retval;
1105
1106 if (is_windows_9x () == TRUE)
1107 {
1108 errno = ENOTSUP;
1109 return FALSE;
1110 }
1111
1112 if (g_b_init_convert_sddl_to_sd == 0)
1113 {
1114 g_b_init_convert_sddl_to_sd = 1;
1115#ifdef _UNICODE
1116 s_pfn_Convert_SDDL_To_SD =
1117 (ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1118 "ConvertStringSecurityDescriptorToSecurityDescriptorW");
1119#else
1120 s_pfn_Convert_SDDL_To_SD =
1121 (ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)GetProcAddress (GetModuleHandle ("Advapi32.dll"),
1122 "ConvertStringSecurityDescriptorToSecurityDescriptorA");
1123#endif
1124 }
1125 if (s_pfn_Convert_SDDL_To_SD == NULL)
1126 {
1127 errno = ENOTSUP;
1128 return FALSE;
1129 }
1130
1131 retval = s_pfn_Convert_SDDL_To_SD (StringSecurityDescriptor,
1132 StringSDRevision,
1133 SecurityDescriptor,
1134 SecurityDescriptorSize);
1135
1136 return retval;
1137}
1138
1139static DWORD WINAPI
1140get_adapters_info (PIP_ADAPTER_INFO pAdapterInfo, PULONG pOutBufLen)
1141{
1142 static GetAdaptersInfo_Proc s_pfn_Get_Adapters_Info = NULL;
1143 HMODULE hm_iphlpapi = NULL;
1144
1145 if (is_windows_9x () == TRUE)
1146 return ERROR_NOT_SUPPORTED;
1147
1148 if (g_b_init_get_adapters_info == 0)
1149 {
1150 g_b_init_get_adapters_info = 1;
1151 hm_iphlpapi = LoadLibrary ("Iphlpapi.dll");
1152 if (hm_iphlpapi)
1153 s_pfn_Get_Adapters_Info = (GetAdaptersInfo_Proc)
1154 GetProcAddress (hm_iphlpapi, "GetAdaptersInfo");
1155 }
1156 if (s_pfn_Get_Adapters_Info == NULL)
1157 return ERROR_NOT_SUPPORTED;
1158 return s_pfn_Get_Adapters_Info (pAdapterInfo, pOutBufLen);
1159}
1160
1161\f
1162
1163/* Return 1 if P is a valid pointer to an object of size SIZE. Return
1164 0 if P is NOT a valid pointer. Return -1 if we cannot validate P.
1165
1166 This is called from alloc.c:valid_pointer_p. */
1167int
1168w32_valid_pointer_p (void *p, int size)
1169{
1170 SIZE_T done;
1171 HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());
1172
1173 if (h)
1174 {
1175 unsigned char *buf = alloca (size);
1176 int retval = ReadProcessMemory (h, p, buf, size, &done);
1177
1178 CloseHandle (h);
1179 return retval;
1180 }
1181 else
1182 return -1;
1183}
1184
1185\f
1186
1187/* Converting file names from UTF-8 to either UTF-16 or the ANSI
1188 codepage defined by file-name-coding-system. */
1189
1190/* Current codepage for encoding file names. */
1191static int file_name_codepage;
1192
1193/* Produce a Windows ANSI codepage suitable for encoding file names.
1194 Return the information about that codepage in CP_INFO. */
1195static int
1196codepage_for_filenames (CPINFO *cp_info)
1197{
1198 /* A simple cache to avoid calling GetCPInfo every time we need to
1199 encode/decode a file name. The file-name encoding is not
1200 supposed to be changed too frequently, if ever. */
1201 static Lisp_Object last_file_name_encoding;
1202 static CPINFO cp;
1203 Lisp_Object current_encoding;
1204
1205 current_encoding = Vfile_name_coding_system;
1206 if (NILP (current_encoding))
1207 current_encoding = Vdefault_file_name_coding_system;
1208
1209 if (!EQ (last_file_name_encoding, current_encoding))
1210 {
1211 /* Default to the current ANSI codepage. */
1212 file_name_codepage = w32_ansi_code_page;
1213
1214 if (NILP (current_encoding))
1215 {
1216 char *cpname = SDATA (SYMBOL_NAME (current_encoding));
1217 char *cp = NULL, *end;
1218 int cpnum;
1219
1220 if (strncmp (cpname, "cp", 2) == 0)
1221 cp = cpname + 2;
1222 else if (strncmp (cpname, "windows-", 8) == 0)
1223 cp = cpname + 8;
1224
1225 if (cp)
1226 {
1227 end = cp;
1228 cpnum = strtol (cp, &end, 10);
1229 if (cpnum && *end == '\0' && end - cp >= 2)
1230 file_name_codepage = cpnum;
1231 }
1232 }
1233
1234 if (!file_name_codepage)
1235 file_name_codepage = CP_ACP; /* CP_ACP = 0, but let's not assume that */
1236
1237 if (!GetCPInfo (file_name_codepage, &cp))
1238 {
1239 file_name_codepage = CP_ACP;
1240 if (!GetCPInfo (file_name_codepage, &cp))
1241 emacs_abort ();
1242 }
1243 }
1244 if (cp_info)
1245 *cp_info = cp;
1246
1247 return file_name_codepage;
1248}
1249
1250static int
1251filename_to_utf16 (const char *fn_in, wchar_t *fn_out)
1252{
1253 int result = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, fn_in, -1,
1254 fn_out, MAX_PATH);
1255
1256 if (!result)
1257 {
1258 DWORD err = GetLastError ();
1259
1260 switch (err)
1261 {
1262 case ERROR_INVALID_FLAGS:
1263 case ERROR_INVALID_PARAMETER:
1264 errno = EINVAL;
1265 break;
1266 case ERROR_INSUFFICIENT_BUFFER:
1267 case ERROR_NO_UNICODE_TRANSLATION:
1268 default:
1269 errno = ENOENT;
1270 break;
1271 }
1272 return -1;
1273 }
1274 return 0;
1275}
1276
1277static int
1278filename_from_utf16 (const wchar_t *fn_in, char *fn_out)
1279{
1280 int result = WideCharToMultiByte (CP_UTF8, 0, fn_in, -1,
1281 fn_out, MAX_UTF8_PATH, NULL, NULL);
1282
1283 if (!result)
1284 {
1285 DWORD err = GetLastError ();
1286
1287 switch (err)
1288 {
1289 case ERROR_INVALID_FLAGS:
1290 case ERROR_INVALID_PARAMETER:
1291 errno = EINVAL;
1292 break;
1293 case ERROR_INSUFFICIENT_BUFFER:
1294 case ERROR_NO_UNICODE_TRANSLATION:
1295 default:
1296 errno = ENOENT;
1297 break;
1298 }
1299 return -1;
1300 }
1301 return 0;
1302}
1303
1304static int
1305filename_to_ansi (const char *fn_in, char *fn_out)
1306{
1307 wchar_t fn_utf16[MAX_PATH];
1308
1309 if (filename_to_utf16 (fn_in, fn_utf16) == 0)
1310 {
1311 int result;
1312 int codepage = codepage_for_filenames (NULL);
1313
1314 result = WideCharToMultiByte (codepage, 0, fn_utf16, -1,
1315 fn_out, MAX_PATH, NULL, NULL);
1316 if (!result)
1317 {
1318 DWORD err = GetLastError ();
1319
1320 switch (err)
1321 {
1322 case ERROR_INVALID_FLAGS:
1323 case ERROR_INVALID_PARAMETER:
1324 errno = EINVAL;
1325 break;
1326 case ERROR_INSUFFICIENT_BUFFER:
1327 case ERROR_NO_UNICODE_TRANSLATION:
1328 default:
1329 errno = ENOENT;
1330 break;
1331 }
1332 return -1;
1333 }
1334 return 0;
1335 }
1336 return -1;
1337}
1338
1339int
1340filename_from_ansi (const char *fn_in, char *fn_out)
1341{
1342 wchar_t fn_utf16[MAX_PATH];
1343 int codepage = codepage_for_filenames (NULL);
1344 int result = MultiByteToWideChar (codepage, MB_ERR_INVALID_CHARS, fn_in, -1,
1345 fn_utf16, MAX_PATH);
1346
1347 if (!result)
1348 {
1349 DWORD err = GetLastError ();
1350
1351 switch (err)
1352 {
1353 case ERROR_INVALID_FLAGS:
1354 case ERROR_INVALID_PARAMETER:
1355 errno = EINVAL;
1356 break;
1357 case ERROR_INSUFFICIENT_BUFFER:
1358 case ERROR_NO_UNICODE_TRANSLATION:
1359 default:
1360 errno = ENOENT;
1361 break;
1362 }
1363 return -1;
1364 }
1365 return filename_from_utf16 (fn_utf16, fn_out);
1366}
1367
1368\f
1369
1370/* The directory where we started, in UTF-8. */
1371static char startup_dir[MAX_UTF8_PATH];
1372
1373/* Get the current working directory. */
1374char *
1375getcwd (char *dir, int dirsize)
1376{
1377 if (!dirsize)
1378 {
1379 errno = EINVAL;
1380 return NULL;
1381 }
1382 if (dirsize <= strlen (startup_dir))
1383 {
1384 errno = ERANGE;
1385 return NULL;
1386 }
1387#if 0
1388 if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
1389 return dir;
1390 return NULL;
1391#else
1392 /* Emacs doesn't actually change directory itself, it stays in the
1393 same directory where it was started. */
1394 strcpy (dir, startup_dir);
1395 return dir;
1396#endif
1397}
1398
1399/* Emulate getloadavg. */
1400
1401struct load_sample {
1402 time_t sample_time;
1403 ULONGLONG idle;
1404 ULONGLONG kernel;
1405 ULONGLONG user;
1406};
1407
1408/* Number of processors on this machine. */
1409static unsigned num_of_processors;
1410
1411/* We maintain 1-sec samples for the last 16 minutes in a circular buffer. */
1412static struct load_sample samples[16*60];
1413static int first_idx = -1, last_idx = -1;
1414static int max_idx = sizeof (samples) / sizeof (samples[0]);
1415
1416static int
1417buf_next (int from)
1418{
1419 int next_idx = from + 1;
1420
1421 if (next_idx >= max_idx)
1422 next_idx = 0;
1423
1424 return next_idx;
1425}
1426
1427static int
1428buf_prev (int from)
1429{
1430 int prev_idx = from - 1;
1431
1432 if (prev_idx < 0)
1433 prev_idx = max_idx - 1;
1434
1435 return prev_idx;
1436}
1437
1438static void
1439sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
1440{
1441 SYSTEM_INFO sysinfo;
1442 FILETIME ft_idle, ft_user, ft_kernel;
1443
1444 /* Initialize the number of processors on this machine. */
1445 if (num_of_processors <= 0)
1446 {
1447 get_native_system_info (&sysinfo);
1448 num_of_processors = sysinfo.dwNumberOfProcessors;
1449 if (num_of_processors <= 0)
1450 {
1451 GetSystemInfo (&sysinfo);
1452 num_of_processors = sysinfo.dwNumberOfProcessors;
1453 }
1454 if (num_of_processors <= 0)
1455 num_of_processors = 1;
1456 }
1457
1458 /* TODO: Take into account threads that are ready to run, by
1459 sampling the "\System\Processor Queue Length" performance
1460 counter. The code below accounts only for threads that are
1461 actually running. */
1462
1463 if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
1464 {
1465 ULARGE_INTEGER uidle, ukernel, uuser;
1466
1467 memcpy (&uidle, &ft_idle, sizeof (ft_idle));
1468 memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
1469 memcpy (&uuser, &ft_user, sizeof (ft_user));
1470 *idle = uidle.QuadPart;
1471 *kernel = ukernel.QuadPart;
1472 *user = uuser.QuadPart;
1473 }
1474 else
1475 {
1476 *idle = 0;
1477 *kernel = 0;
1478 *user = 0;
1479 }
1480}
1481
1482/* Produce the load average for a given time interval, using the
1483 samples in the samples[] array. WHICH can be 0, 1, or 2, meaning
1484 1-minute, 5-minute, or 15-minute average, respectively. */
1485static double
1486getavg (int which)
1487{
1488 double retval = -1.0;
1489 double tdiff;
1490 int idx;
1491 double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
1492 time_t now = samples[last_idx].sample_time;
1493
1494 if (first_idx != last_idx)
1495 {
1496 for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
1497 {
1498 tdiff = difftime (now, samples[idx].sample_time);
1499 if (tdiff >= span - 2*DBL_EPSILON*now)
1500 {
1501 long double sys =
1502 samples[last_idx].kernel + samples[last_idx].user
1503 - (samples[idx].kernel + samples[idx].user);
1504 long double idl = samples[last_idx].idle - samples[idx].idle;
1505
1506 retval = (1.0 - idl / sys) * num_of_processors;
1507 break;
1508 }
1509 if (idx == first_idx)
1510 break;
1511 }
1512 }
1513
1514 return retval;
1515}
1516
1517int
1518getloadavg (double loadavg[], int nelem)
1519{
1520 int elem;
1521 ULONGLONG idle, kernel, user;
1522 time_t now = time (NULL);
1523
1524 /* Store another sample. We ignore samples that are less than 1 sec
1525 apart. */
1526 if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
1527 {
1528 sample_system_load (&idle, &kernel, &user);
1529 last_idx = buf_next (last_idx);
1530 samples[last_idx].sample_time = now;
1531 samples[last_idx].idle = idle;
1532 samples[last_idx].kernel = kernel;
1533 samples[last_idx].user = user;
1534 /* If the buffer has more that 15 min worth of samples, discard
1535 the old ones. */
1536 if (first_idx == -1)
1537 first_idx = last_idx;
1538 while (first_idx != last_idx
1539 && (difftime (now, samples[first_idx].sample_time)
1540 >= 15.0*60 + 2*DBL_EPSILON*now))
1541 first_idx = buf_next (first_idx);
1542 }
1543
1544 for (elem = 0; elem < nelem; elem++)
1545 {
1546 double avg = getavg (elem);
1547
1548 if (avg < 0)
1549 break;
1550 loadavg[elem] = avg;
1551 }
1552
1553 return elem;
1554}
1555
1556/* Emulate getpwuid, getpwnam and others. */
1557
1558#define PASSWD_FIELD_SIZE 256
1559
1560static char dflt_passwd_name[PASSWD_FIELD_SIZE];
1561static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
1562static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
1563static char dflt_passwd_dir[MAX_UTF8_PATH];
1564static char dflt_passwd_shell[MAX_UTF8_PATH];
1565
1566static struct passwd dflt_passwd =
1567{
1568 dflt_passwd_name,
1569 dflt_passwd_passwd,
1570 0,
1571 0,
1572 0,
1573 dflt_passwd_gecos,
1574 dflt_passwd_dir,
1575 dflt_passwd_shell,
1576};
1577
1578static char dflt_group_name[GNLEN+1];
1579
1580static struct group dflt_group =
1581{
1582 /* When group information is not available, we return this as the
1583 group for all files. */
1584 dflt_group_name,
1585 0,
1586};
1587
1588unsigned
1589getuid (void)
1590{
1591 return dflt_passwd.pw_uid;
1592}
1593
1594unsigned
1595geteuid (void)
1596{
1597 /* I could imagine arguing for checking to see whether the user is
1598 in the Administrators group and returning a UID of 0 for that
1599 case, but I don't know how wise that would be in the long run. */
1600 return getuid ();
1601}
1602
1603unsigned
1604getgid (void)
1605{
1606 return dflt_passwd.pw_gid;
1607}
1608
1609unsigned
1610getegid (void)
1611{
1612 return getgid ();
1613}
1614
1615struct passwd *
1616getpwuid (unsigned uid)
1617{
1618 if (uid == dflt_passwd.pw_uid)
1619 return &dflt_passwd;
1620 return NULL;
1621}
1622
1623struct group *
1624getgrgid (gid_t gid)
1625{
1626 return &dflt_group;
1627}
1628
1629struct passwd *
1630getpwnam (char *name)
1631{
1632 struct passwd *pw;
1633
1634 pw = getpwuid (getuid ());
1635 if (!pw)
1636 return pw;
1637
1638 if (xstrcasecmp (name, pw->pw_name))
1639 return NULL;
1640
1641 return pw;
1642}
1643
1644static void
1645init_user_info (void)
1646{
1647 /* Find the user's real name by opening the process token and
1648 looking up the name associated with the user-sid in that token.
1649
1650 Use the relative portion of the identifier authority value from
1651 the user-sid as the user id value (same for group id using the
1652 primary group sid from the process token). */
1653
1654 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
1655 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
1656 DWORD glength = sizeof (gname);
1657 HANDLE token = NULL;
1658 SID_NAME_USE user_type;
1659 unsigned char *buf = NULL;
1660 DWORD blen = 0;
1661 TOKEN_USER user_token;
1662 TOKEN_PRIMARY_GROUP group_token;
1663 BOOL result;
1664
1665 result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
1666 if (result)
1667 {
1668 result = get_token_information (token, TokenUser, NULL, 0, &blen);
1669 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1670 {
1671 buf = xmalloc (blen);
1672 result = get_token_information (token, TokenUser,
1673 (LPVOID)buf, blen, &needed);
1674 if (result)
1675 {
1676 memcpy (&user_token, buf, sizeof (user_token));
1677 result = lookup_account_sid (NULL, user_token.User.Sid,
1678 uname, &ulength,
1679 domain, &dlength, &user_type);
1680 }
1681 }
1682 else
1683 result = FALSE;
1684 }
1685 if (result)
1686 {
1687 strcpy (dflt_passwd.pw_name, uname);
1688 /* Determine a reasonable uid value. */
1689 if (xstrcasecmp ("administrator", uname) == 0)
1690 {
1691 dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
1692 dflt_passwd.pw_gid = 513; /* well-known None gid */
1693 }
1694 else
1695 {
1696 /* Use the last sub-authority value of the RID, the relative
1697 portion of the SID, as user/group ID. */
1698 dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
1699
1700 /* Get group id and name. */
1701 result = get_token_information (token, TokenPrimaryGroup,
1702 (LPVOID)buf, blen, &needed);
1703 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1704 {
1705 buf = xrealloc (buf, blen = needed);
1706 result = get_token_information (token, TokenPrimaryGroup,
1707 (LPVOID)buf, blen, &needed);
1708 }
1709 if (result)
1710 {
1711 memcpy (&group_token, buf, sizeof (group_token));
1712 dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
1713 dlength = sizeof (domain);
1714 /* If we can get at the real Primary Group name, use that.
1715 Otherwise, the default group name was already set to
1716 "None" in globals_of_w32. */
1717 if (lookup_account_sid (NULL, group_token.PrimaryGroup,
1718 gname, &glength, NULL, &dlength,
1719 &user_type))
1720 strcpy (dflt_group_name, gname);
1721 }
1722 else
1723 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1724 }
1725 }
1726 /* If security calls are not supported (presumably because we
1727 are running under Windows 9X), fallback to this: */
1728 else if (GetUserName (uname, &ulength))
1729 {
1730 strcpy (dflt_passwd.pw_name, uname);
1731 if (xstrcasecmp ("administrator", uname) == 0)
1732 dflt_passwd.pw_uid = 0;
1733 else
1734 dflt_passwd.pw_uid = 123;
1735 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1736 }
1737 else
1738 {
1739 strcpy (dflt_passwd.pw_name, "unknown");
1740 dflt_passwd.pw_uid = 123;
1741 dflt_passwd.pw_gid = 123;
1742 }
1743 dflt_group.gr_gid = dflt_passwd.pw_gid;
1744
1745 /* Set dir and shell from environment variables. */
1746 if (w32_unicode_filenames)
1747 {
1748 wchar_t *home = _wgetenv (L"HOME");
1749 wchar_t *shell = _wgetenv (L"SHELL");
1750
1751 /* Ensure HOME and SHELL are defined. */
1752 if (home == NULL)
1753 emacs_abort ();
1754 if (shell == NULL)
1755 emacs_abort ();
1756 filename_from_utf16 (home, dflt_passwd.pw_dir);
1757 filename_from_utf16 (shell, dflt_passwd.pw_shell);
1758 }
1759 else
1760 {
1761 char *home = getenv ("HOME");
1762 char *shell = getenv ("SHELL");
1763
1764 if (home == NULL)
1765 emacs_abort ();
1766 if (shell == NULL)
1767 emacs_abort ();
1768 filename_from_ansi (home, dflt_passwd.pw_dir);
1769 filename_from_ansi (shell, dflt_passwd.pw_shell);
1770 }
1771
1772 xfree (buf);
1773 if (token)
1774 CloseHandle (token);
1775}
1776
1777int
1778random (void)
1779{
1780 /* rand () on NT gives us 15 random bits...hack together 30 bits. */
1781 return ((rand () << 15) | rand ());
1782}
1783
1784void
1785srandom (int seed)
1786{
1787 srand (seed);
1788}
1789
1790/* Return the maximum length in bytes of a multibyte character
1791 sequence encoded in the current ANSI codepage. This is required to
1792 correctly walk the encoded file names one character at a time. */
1793static int
1794max_filename_mbslen (void)
1795{
1796 CPINFO cp_info;
1797
1798 codepage_for_filenames (&cp_info);
1799 return cp_info.MaxCharSize;
1800}
1801
1802/* Normalize filename by converting in-place all of its path
1803 separators to the separator specified by PATH_SEP. */
1804
1805static void
1806normalize_filename (register char *fp, char path_sep)
1807{
1808 char *p2;
1809
1810 /* Always lower-case drive letters a-z, even if the filesystem
1811 preserves case in filenames.
1812 This is so filenames can be compared by string comparison
1813 functions that are case-sensitive. Even case-preserving filesystems
1814 do not distinguish case in drive letters. */
1815 p2 = fp + 1;
1816
1817 if (*p2 == ':' && *fp >= 'A' && *fp <= 'Z')
1818 {
1819 *fp += 'a' - 'A';
1820 fp += 2;
1821 }
1822
1823 while (*fp)
1824 {
1825 if (*fp == '/' || *fp == '\\')
1826 *fp = path_sep;
1827 fp++;
1828 }
1829}
1830
1831/* Destructively turn backslashes into slashes. */
1832void
1833dostounix_filename (register char *p)
1834{
1835 normalize_filename (p, '/');
1836}
1837
1838/* Destructively turn slashes into backslashes. */
1839void
1840unixtodos_filename (register char *p)
1841{
1842 normalize_filename (p, '\\');
1843}
1844
1845/* Remove all CR's that are followed by a LF.
1846 (From msdos.c...probably should figure out a way to share it,
1847 although this code isn't going to ever change.) */
1848static int
1849crlf_to_lf (register int n, register unsigned char *buf)
1850{
1851 unsigned char *np = buf;
1852 unsigned char *startp = buf;
1853 unsigned char *endp = buf + n;
1854
1855 if (n == 0)
1856 return n;
1857 while (buf < endp - 1)
1858 {
1859 if (*buf == 0x0d)
1860 {
1861 if (*(++buf) != 0x0a)
1862 *np++ = 0x0d;
1863 }
1864 else
1865 *np++ = *buf++;
1866 }
1867 if (buf < endp)
1868 *np++ = *buf++;
1869 return np - startp;
1870}
1871
1872/* Parse the root part of file name, if present. Return length and
1873 optionally store pointer to char after root. */
1874static int
1875parse_root (char * name, char ** pPath)
1876{
1877 char * start = name;
1878
1879 if (name == NULL)
1880 return 0;
1881
1882 /* find the root name of the volume if given */
1883 if (isalpha (name[0]) && name[1] == ':')
1884 {
1885 /* skip past drive specifier */
1886 name += 2;
1887 if (IS_DIRECTORY_SEP (name[0]))
1888 name++;
1889 }
1890 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
1891 {
1892 int slashes = 2;
1893
1894 name += 2;
1895 do
1896 {
1897 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
1898 break;
1899 name++;
1900 }
1901 while ( *name );
1902 if (IS_DIRECTORY_SEP (name[0]))
1903 name++;
1904 }
1905
1906 if (pPath)
1907 *pPath = name;
1908
1909 return name - start;
1910}
1911
1912/* Get long base name for name; name is assumed to be absolute. */
1913static int
1914get_long_basename (char * name, char * buf, int size)
1915{
1916 HANDLE dir_handle;
1917 char fname_utf8[MAX_UTF8_PATH];
1918 int len = 0;
1919 int cstatus;
1920
1921 /* Must be valid filename, no wild cards or other invalid characters. */
1922 if (strpbrk (name, "*?|<>\""))
1923 return 0;
1924
1925 if (w32_unicode_filenames)
1926 {
1927 wchar_t fname_utf16[MAX_PATH];
1928 WIN32_FIND_DATAW find_data_wide;
1929
1930 filename_to_utf16 (name, fname_utf16);
1931 dir_handle = FindFirstFileW (fname_utf16, &find_data_wide);
1932 if (dir_handle != INVALID_HANDLE_VALUE)
1933 cstatus = filename_from_utf16 (find_data_wide.cFileName, fname_utf8);
1934 }
1935 else
1936 {
1937 char fname_ansi[MAX_PATH];
1938 WIN32_FIND_DATAA find_data_ansi;
1939
1940 filename_to_ansi (name, fname_ansi);
1941 dir_handle = FindFirstFileA (fname_ansi, &find_data_ansi);
1942 if (dir_handle != INVALID_HANDLE_VALUE)
1943 cstatus = filename_from_ansi (find_data_ansi.cFileName, fname_utf8);
1944 }
1945
1946 if (cstatus == 0 && (len = strlen (fname_utf8)) < size)
1947 memcpy (buf, fname_utf8, len + 1);
1948 else
1949 len = 0;
1950
1951 if (dir_handle != INVALID_HANDLE_VALUE)
1952 FindClose (dir_handle);
1953
1954 return len;
1955}
1956
1957/* Get long name for file, if possible (assumed to be absolute). */
1958BOOL
1959w32_get_long_filename (char * name, char * buf, int size)
1960{
1961 char * o = buf;
1962 char * p;
1963 char * q;
1964 char full[ MAX_UTF8_PATH ];
1965 int len;
1966
1967 len = strlen (name);
1968 if (len >= MAX_UTF8_PATH)
1969 return FALSE;
1970
1971 /* Use local copy for destructive modification. */
1972 memcpy (full, name, len+1);
1973 unixtodos_filename (full);
1974
1975 /* Copy root part verbatim. */
1976 len = parse_root (full, &p);
1977 memcpy (o, full, len);
1978 o += len;
1979 *o = '\0';
1980 size -= len;
1981
1982 while (p != NULL && *p)
1983 {
1984 q = p;
1985 p = strchr (q, '\\');
1986 if (p) *p = '\0';
1987 len = get_long_basename (full, o, size);
1988 if (len > 0)
1989 {
1990 o += len;
1991 size -= len;
1992 if (p != NULL)
1993 {
1994 *p++ = '\\';
1995 if (size < 2)
1996 return FALSE;
1997 *o++ = '\\';
1998 size--;
1999 *o = '\0';
2000 }
2001 }
2002 else
2003 return FALSE;
2004 }
2005
2006 return TRUE;
2007}
2008
2009unsigned int
2010w32_get_short_filename (char * name, char * buf, int size)
2011{
2012 if (w32_unicode_filenames)
2013 {
2014 wchar_t name_utf16[MAX_PATH], short_name[MAX_PATH];
2015 unsigned int retval;
2016
2017 filename_to_utf16 (name, name_utf16);
2018 retval = GetShortPathNameW (name_utf16, short_name, size);
2019 if (retval && retval < size)
2020 filename_from_utf16 (short_name, buf);
2021 return retval;
2022 }
2023 else
2024 {
2025 char name_ansi[MAX_PATH];
2026
2027 filename_to_ansi (name, name_ansi);
2028 return GetShortPathNameA (name_ansi, buf, size);
2029 }
2030}
2031
2032static int
2033is_unc_volume (const char *filename)
2034{
2035 const char *ptr = filename;
2036
2037 if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
2038 return 0;
2039
2040 if (strpbrk (ptr + 2, "*?|<>\"\\/"))
2041 return 0;
2042
2043 return 1;
2044}
2045
2046/* Emulate the Posix unsetenv. */
2047int
2048unsetenv (const char *name)
2049{
2050 char *var;
2051 size_t name_len;
2052 int retval;
2053
2054 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
2055 {
2056 errno = EINVAL;
2057 return -1;
2058 }
2059 name_len = strlen (name);
2060 /* MS docs says an environment variable cannot be longer than 32K. */
2061 if (name_len > 32767)
2062 {
2063 errno = ENOMEM;
2064 return 0;
2065 }
2066 /* It is safe to use 'alloca' with 32K size, since the stack is at
2067 least 2MB, and we set it to 8MB in the link command line. */
2068 var = alloca (name_len + 2);
2069 strncpy (var, name, name_len);
2070 var[name_len++] = '=';
2071 var[name_len] = '\0';
2072 return _putenv (var);
2073}
2074
2075/* MS _putenv doesn't support removing a variable when the argument
2076 does not include the '=' character, so we fix that here. */
2077int
2078sys_putenv (char *str)
2079{
2080 const char *const name_end = strchr (str, '=');
2081
2082 if (name_end == NULL)
2083 {
2084 /* Remove the variable from the environment. */
2085 return unsetenv (str);
2086 }
2087
2088 return _putenv (str);
2089}
2090
2091#define REG_ROOT "SOFTWARE\\GNU\\Emacs"
2092
2093LPBYTE
2094w32_get_resource (char *key, LPDWORD lpdwtype)
2095{
2096 LPBYTE lpvalue;
2097 HKEY hrootkey = NULL;
2098 DWORD cbData;
2099
2100 /* Check both the current user and the local machine to see if
2101 we have any resources. */
2102
2103 if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
2104 {
2105 lpvalue = NULL;
2106
2107 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
2108 && (lpvalue = xmalloc (cbData)) != NULL
2109 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
2110 {
2111 RegCloseKey (hrootkey);
2112 return (lpvalue);
2113 }
2114
2115 xfree (lpvalue);
2116
2117 RegCloseKey (hrootkey);
2118 }
2119
2120 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
2121 {
2122 lpvalue = NULL;
2123
2124 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
2125 && (lpvalue = xmalloc (cbData)) != NULL
2126 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
2127 {
2128 RegCloseKey (hrootkey);
2129 return (lpvalue);
2130 }
2131
2132 xfree (lpvalue);
2133
2134 RegCloseKey (hrootkey);
2135 }
2136
2137 return (NULL);
2138}
2139
2140void
2141init_environment (char ** argv)
2142{
2143 static const char * const tempdirs[] = {
2144 "$TMPDIR", "$TEMP", "$TMP", "c:/"
2145 };
2146
2147 int i;
2148
2149 const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);
2150
2151 /* Implementation note: This function explicitly works with ANSI
2152 file names, not with UTF-8 encoded file names. This is because
2153 this function pushes variables into the Emacs's environment, and
2154 the environment variables are always assumed to be in the
2155 locale-specific encoding. Do NOT call any functions that accept
2156 UTF-8 file names from this function! */
2157
2158 /* Make sure they have a usable $TMPDIR. Many Emacs functions use
2159 temporary files and assume "/tmp" if $TMPDIR is unset, which
2160 will break on DOS/Windows. Refuse to work if we cannot find
2161 a directory, not even "c:/", usable for that purpose. */
2162 for (i = 0; i < imax ; i++)
2163 {
2164 const char *tmp = tempdirs[i];
2165
2166 if (*tmp == '$')
2167 tmp = getenv (tmp + 1);
2168 /* Note that `access' can lie to us if the directory resides on a
2169 read-only filesystem, like CD-ROM or a write-protected floppy.
2170 The only way to be really sure is to actually create a file and
2171 see if it succeeds. But I think that's too much to ask. */
2172
2173 /* MSVCRT's _access crashes with D_OK, so we use our replacement. */
2174 if (tmp && sys_access (tmp, D_OK) == 0)
2175 {
2176 char * var = alloca (strlen (tmp) + 8);
2177 sprintf (var, "TMPDIR=%s", tmp);
2178 _putenv (strdup (var));
2179 break;
2180 }
2181 }
2182 if (i >= imax)
2183 cmd_error_internal
2184 (Fcons (Qerror,
2185 Fcons (build_string ("no usable temporary directories found!!"),
2186 Qnil)),
2187 "While setting TMPDIR: ");
2188
2189 /* Check for environment variables and use registry settings if they
2190 don't exist. Fallback on default values where applicable. */
2191 {
2192 int i;
2193 LPBYTE lpval;
2194 DWORD dwType;
2195 char locale_name[32];
2196 char default_home[MAX_PATH];
2197 int appdata = 0;
2198
2199 static const struct env_entry
2200 {
2201 char * name;
2202 char * def_value;
2203 } dflt_envvars[] =
2204 {
2205 /* If the default value is NULL, we will use the value from the
2206 outside environment or the Registry, but will not push the
2207 variable into the Emacs environment if it is defined neither
2208 in the Registry nor in the outside environment. */
2209 {"HOME", "C:/"},
2210 {"PRELOAD_WINSOCK", NULL},
2211 {"emacs_dir", "C:/emacs"},
2212 {"EMACSLOADPATH", NULL},
2213 {"SHELL", "cmdproxy.exe"}, /* perhaps it is somewhere on PATH */
2214 {"EMACSDATA", NULL},
2215 {"EMACSPATH", NULL},
2216 {"INFOPATH", NULL},
2217 {"EMACSDOC", NULL},
2218 {"TERM", "cmd"},
2219 {"LANG", NULL},
2220 };
2221
2222#define N_ENV_VARS sizeof (dflt_envvars)/sizeof (dflt_envvars[0])
2223
2224 /* We need to copy dflt_envvars[] and work on the copy because we
2225 don't want the dumped Emacs to inherit the values of
2226 environment variables we saw during dumping (which could be on
2227 a different system). The defaults above must be left intact. */
2228 struct env_entry env_vars[N_ENV_VARS];
2229
2230 for (i = 0; i < N_ENV_VARS; i++)
2231 env_vars[i] = dflt_envvars[i];
2232
2233 /* For backwards compatibility, check if a .emacs file exists in C:/
2234 If not, then we can try to default to the appdata directory under the
2235 user's profile, which is more likely to be writable. */
2236 if (sys_access ("C:/.emacs", F_OK) != 0)
2237 {
2238 HRESULT profile_result;
2239 /* Dynamically load ShGetFolderPath, as it won't exist on versions
2240 of Windows 95 and NT4 that have not been updated to include
2241 MSIE 5. */
2242 ShGetFolderPath_fn get_folder_path;
2243 get_folder_path = (ShGetFolderPath_fn)
2244 GetProcAddress (GetModuleHandle ("shell32.dll"), "SHGetFolderPathA");
2245
2246 if (get_folder_path != NULL)
2247 {
2248 profile_result = get_folder_path (NULL, CSIDL_APPDATA, NULL,
2249 0, default_home);
2250
2251 /* If we can't get the appdata dir, revert to old behavior. */
2252 if (profile_result == S_OK)
2253 {
2254 env_vars[0].def_value = default_home;
2255 appdata = 1;
2256 }
2257 }
2258 }
2259
2260 /* Get default locale info and use it for LANG. */
2261 if (GetLocaleInfo (LOCALE_USER_DEFAULT,
2262 LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
2263 locale_name, sizeof (locale_name)))
2264 {
2265 for (i = 0; i < N_ENV_VARS; i++)
2266 {
2267 if (strcmp (env_vars[i].name, "LANG") == 0)
2268 {
2269 env_vars[i].def_value = locale_name;
2270 break;
2271 }
2272 }
2273 }
2274
2275#define SET_ENV_BUF_SIZE (4 * MAX_PATH) /* to cover EMACSLOADPATH */
2276
2277 /* Treat emacs_dir specially: set it unconditionally based on our
2278 location. */
2279 {
2280 char *p;
2281 char modname[MAX_PATH];
2282
2283 if (!GetModuleFileName (NULL, modname, MAX_PATH))
2284 emacs_abort ();
2285 if ((p = _mbsrchr (modname, '\\')) == NULL)
2286 emacs_abort ();
2287 *p = 0;
2288
2289 if ((p = _mbsrchr (modname, '\\'))
2290 /* From bin means installed Emacs, from src means uninstalled. */
2291 && (xstrcasecmp (p, "\\bin") == 0 || xstrcasecmp (p, "\\src") == 0))
2292 {
2293 char buf[SET_ENV_BUF_SIZE];
2294 int within_build_tree = xstrcasecmp (p, "\\src") == 0;
2295
2296 *p = 0;
2297 for (p = modname; *p; p = CharNext (p))
2298 if (*p == '\\') *p = '/';
2299
2300 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
2301 _putenv (strdup (buf));
2302 /* If we are running from the Posix-like build tree, define
2303 SHELL to point to our own cmdproxy. The loop below will
2304 then disregard PATH_EXEC and the default value. */
2305 if (within_build_tree)
2306 {
2307 _snprintf (buf, sizeof (buf) - 1,
2308 "SHELL=%s/nt/cmdproxy.exe", modname);
2309 _putenv (strdup (buf));
2310 }
2311 }
2312 }
2313
2314 for (i = 0; i < N_ENV_VARS; i++)
2315 {
2316 if (!getenv (env_vars[i].name))
2317 {
2318 int dont_free = 0;
2319 char bufc[SET_ENV_BUF_SIZE];
2320
2321 if ((lpval = w32_get_resource (env_vars[i].name, &dwType)) == NULL
2322 /* Also ignore empty environment variables. */
2323 || *lpval == 0)
2324 {
2325 xfree (lpval);
2326 dont_free = 1;
2327 if (strcmp (env_vars[i].name, "SHELL") == 0)
2328 {
2329 /* Look for cmdproxy.exe in every directory in
2330 PATH_EXEC. FIXME: This does not find cmdproxy
2331 in nt/ when we run uninstalled. */
2332 char fname[MAX_PATH];
2333 const char *pstart = PATH_EXEC, *pend;
2334
2335 do {
2336 pend = _mbschr (pstart, ';');
2337 if (!pend)
2338 pend = pstart + strlen (pstart);
2339 /* Be defensive against series of ;;; characters. */
2340 if (pend > pstart)
2341 {
2342 strncpy (fname, pstart, pend - pstart);
2343 fname[pend - pstart] = '/';
2344 strcpy (&fname[pend - pstart + 1], "cmdproxy.exe");
2345 ExpandEnvironmentStrings ((LPSTR) fname, bufc,
2346 sizeof (bufc));
2347 if (sys_access (bufc, F_OK) == 0)
2348 {
2349 lpval = bufc;
2350 dwType = REG_SZ;
2351 break;
2352 }
2353 }
2354 if (*pend)
2355 pstart = pend + 1;
2356 else
2357 pstart = pend;
2358 if (!*pstart)
2359 {
2360 /* If not found in any directory, use the
2361 default as the last resort. */
2362 lpval = env_vars[i].def_value;
2363 dwType = REG_EXPAND_SZ;
2364 }
2365 } while (*pstart);
2366 }
2367 else
2368 {
2369 lpval = env_vars[i].def_value;
2370 dwType = REG_EXPAND_SZ;
2371 }
2372 if (strcmp (env_vars[i].name, "HOME") == 0 && !appdata)
2373 Vdelayed_warnings_list
2374 = Fcons (listn (CONSTYPE_HEAP, 2,
2375 intern ("initialization"),
2376 build_string ("Setting HOME to C:\\ by default is deprecated")),
2377 Vdelayed_warnings_list);
2378 }
2379
2380 if (lpval)
2381 {
2382 char buf1[SET_ENV_BUF_SIZE], buf2[SET_ENV_BUF_SIZE];
2383
2384 if (dwType == REG_EXPAND_SZ)
2385 ExpandEnvironmentStrings ((LPSTR) lpval, buf1, sizeof (buf1));
2386 else if (dwType == REG_SZ)
2387 strcpy (buf1, lpval);
2388 if (dwType == REG_EXPAND_SZ || dwType == REG_SZ)
2389 {
2390 _snprintf (buf2, sizeof (buf2)-1, "%s=%s", env_vars[i].name,
2391 buf1);
2392 _putenv (strdup (buf2));
2393 }
2394
2395 if (!dont_free)
2396 xfree (lpval);
2397 }
2398 }
2399 }
2400 }
2401
2402 /* Rebuild system configuration to reflect invoking system. */
2403 Vsystem_configuration = build_string (EMACS_CONFIGURATION);
2404
2405 /* Another special case: on NT, the PATH variable is actually named
2406 "Path" although cmd.exe (perhaps NT itself) arranges for
2407 environment variable lookup and setting to be case insensitive.
2408 However, Emacs assumes a fully case sensitive environment, so we
2409 need to change "Path" to "PATH" to match the expectations of
2410 various elisp packages. We do this by the sneaky method of
2411 modifying the string in the C runtime environ entry.
2412
2413 The same applies to COMSPEC. */
2414 {
2415 char ** envp;
2416
2417 for (envp = environ; *envp; envp++)
2418 if (_strnicmp (*envp, "PATH=", 5) == 0)
2419 memcpy (*envp, "PATH=", 5);
2420 else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
2421 memcpy (*envp, "COMSPEC=", 8);
2422 }
2423
2424 /* Remember the initial working directory for getcwd. */
2425 /* FIXME: Do we need to resolve possible symlinks in startup_dir?
2426 Does it matter anywhere in Emacs? */
2427 if (w32_unicode_filenames)
2428 {
2429 wchar_t wstartup_dir[MAX_PATH];
2430
2431 if (!GetCurrentDirectoryW (MAX_PATH, wstartup_dir))
2432 emacs_abort ();
2433 filename_from_utf16 (wstartup_dir, startup_dir);
2434 }
2435 else
2436 {
2437 char astartup_dir[MAX_PATH];
2438
2439 if (!GetCurrentDirectoryA (MAX_PATH, astartup_dir))
2440 emacs_abort ();
2441 filename_from_ansi (astartup_dir, startup_dir);
2442 }
2443
2444 {
2445 static char modname[MAX_PATH];
2446
2447 if (!GetModuleFileName (NULL, modname, MAX_PATH))
2448 emacs_abort ();
2449 argv[0] = modname;
2450 }
2451
2452 /* Determine if there is a middle mouse button, to allow parse_button
2453 to decide whether right mouse events should be mouse-2 or
2454 mouse-3. */
2455 w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
2456
2457 init_user_info ();
2458}
2459
2460/* Called from expand-file-name when default-directory is not a string. */
2461
2462char *
2463emacs_root_dir (void)
2464{
2465 static char root_dir[MAX_UTF8_PATH];
2466 const char *p;
2467
2468 p = getenv ("emacs_dir");
2469 if (p == NULL)
2470 emacs_abort ();
2471 filename_from_ansi (p, root_dir);
2472 root_dir[parse_root (root_dir, NULL)] = '\0';
2473 dostounix_filename (root_dir);
2474 return root_dir;
2475}
2476
2477#include <sys/timeb.h>
2478
2479/* Emulate gettimeofday (Ulrich Leodolter, 1/11/95). */
2480int
2481gettimeofday (struct timeval *__restrict tv, struct timezone *__restrict tz)
2482{
2483 struct _timeb tb;
2484 _ftime (&tb);
2485
2486 tv->tv_sec = tb.time;
2487 tv->tv_usec = tb.millitm * 1000L;
2488 /* Implementation note: _ftime sometimes doesn't update the dstflag
2489 according to the new timezone when the system timezone is
2490 changed. We could fix that by using GetSystemTime and
2491 GetTimeZoneInformation, but that doesn't seem necessary, since
2492 Emacs always calls gettimeofday with the 2nd argument NULL (see
2493 current_emacs_time). */
2494 if (tz)
2495 {
2496 tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich */
2497 tz->tz_dsttime = tb.dstflag; /* type of dst correction */
2498 }
2499 return 0;
2500}
2501
2502/* Emulate fdutimens. */
2503
2504/* Set the access and modification time stamps of FD (a.k.a. FILE) to be
2505 TIMESPEC[0] and TIMESPEC[1], respectively.
2506 FD must be either negative -- in which case it is ignored --
2507 or a file descriptor that is open on FILE.
2508 If FD is nonnegative, then FILE can be NULL, which means
2509 use just futimes instead of utimes.
2510 If TIMESPEC is null, FAIL.
2511 Return 0 on success, -1 (setting errno) on failure. */
2512
2513int
2514fdutimens (int fd, char const *file, struct timespec const timespec[2])
2515{
2516 if (!timespec)
2517 {
2518 errno = ENOSYS;
2519 return -1;
2520 }
2521 if (fd < 0 && !file)
2522 {
2523 errno = EBADF;
2524 return -1;
2525 }
2526 /* _futime's prototype defines 2nd arg as having the type 'struct
2527 _utimbuf', while utime needs to accept 'struct utimbuf' for
2528 compatibility with Posix. So we need to use 2 different (but
2529 equivalent) types to avoid compiler warnings, sigh. */
2530 if (fd >= 0)
2531 {
2532 struct _utimbuf _ut;
2533
2534 _ut.actime = timespec[0].tv_sec;
2535 _ut.modtime = timespec[1].tv_sec;
2536 return _futime (fd, &_ut);
2537 }
2538 else
2539 {
2540 struct utimbuf ut;
2541
2542 ut.actime = timespec[0].tv_sec;
2543 ut.modtime = timespec[1].tv_sec;
2544 /* Call 'utime', which is implemented below, not the MS library
2545 function, which fails on directories. */
2546 return utime (file, &ut);
2547 }
2548}
2549
2550
2551/* ------------------------------------------------------------------------- */
2552/* IO support and wrapper functions for the Windows API. */
2553/* ------------------------------------------------------------------------- */
2554
2555/* Place a wrapper around the MSVC version of ctime. It returns NULL
2556 on network directories, so we handle that case here.
2557 (Ulrich Leodolter, 1/11/95). */
2558char *
2559sys_ctime (const time_t *t)
2560{
2561 char *str = (char *) ctime (t);
2562 return (str ? str : "Sun Jan 01 00:00:00 1970");
2563}
2564
2565/* Emulate sleep...we could have done this with a define, but that
2566 would necessitate including windows.h in the files that used it.
2567 This is much easier. */
2568void
2569sys_sleep (int seconds)
2570{
2571 Sleep (seconds * 1000);
2572}
2573
2574/* Internal MSVC functions for low-level descriptor munging */
2575extern int __cdecl _set_osfhnd (int fd, long h);
2576extern int __cdecl _free_osfhnd (int fd);
2577
2578/* parallel array of private info on file handles */
2579filedesc fd_info [ MAXDESC ];
2580
2581typedef struct volume_info_data {
2582 struct volume_info_data * next;
2583
2584 /* time when info was obtained */
2585 DWORD timestamp;
2586
2587 /* actual volume info */
2588 char * root_dir;
2589 DWORD serialnum;
2590 DWORD maxcomp;
2591 DWORD flags;
2592 char * name;
2593 char * type;
2594} volume_info_data;
2595
2596/* Global referenced by various functions. */
2597static volume_info_data volume_info;
2598
2599/* Vector to indicate which drives are local and fixed (for which cached
2600 data never expires). */
2601static BOOL fixed_drives[26];
2602
2603/* Consider cached volume information to be stale if older than 10s,
2604 at least for non-local drives. Info for fixed drives is never stale. */
2605#define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
2606#define VOLINFO_STILL_VALID( root_dir, info ) \
2607 ( ( isalpha (root_dir[0]) && \
2608 fixed_drives[ DRIVE_INDEX (root_dir[0]) ] ) \
2609 || GetTickCount () - info->timestamp < 10000 )
2610
2611/* Cache support functions. */
2612
2613/* Simple linked list with linear search is sufficient. */
2614static volume_info_data *volume_cache = NULL;
2615
2616static volume_info_data *
2617lookup_volume_info (char * root_dir)
2618{
2619 volume_info_data * info;
2620
2621 for (info = volume_cache; info; info = info->next)
2622 if (xstrcasecmp (info->root_dir, root_dir) == 0)
2623 break;
2624 return info;
2625}
2626
2627static void
2628add_volume_info (char * root_dir, volume_info_data * info)
2629{
2630 info->root_dir = xstrdup (root_dir);
2631 info->next = volume_cache;
2632 volume_cache = info;
2633}
2634
2635
2636/* Wrapper for GetVolumeInformation, which uses caching to avoid
2637 performance penalty (~2ms on 486 for local drives, 7.5ms for local
2638 cdrom drive, ~5-10ms or more for remote drives on LAN). */
2639static volume_info_data *
2640GetCachedVolumeInformation (char * root_dir)
2641{
2642 volume_info_data * info;
2643 char default_root[ MAX_PATH ];
2644
2645 /* NULL for root_dir means use root from current directory. */
2646 if (root_dir == NULL)
2647 {
2648 if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
2649 return NULL;
2650 parse_root (default_root, &root_dir);
2651 *root_dir = 0;
2652 root_dir = default_root;
2653 }
2654
2655 /* Local fixed drives can be cached permanently. Removable drives
2656 cannot be cached permanently, since the volume name and serial
2657 number (if nothing else) can change. Remote drives should be
2658 treated as if they are removable, since there is no sure way to
2659 tell whether they are or not. Also, the UNC association of drive
2660 letters mapped to remote volumes can be changed at any time (even
2661 by other processes) without notice.
2662
2663 As a compromise, so we can benefit from caching info for remote
2664 volumes, we use a simple expiry mechanism to invalidate cache
2665 entries that are more than ten seconds old. */
2666
2667#if 0
2668 /* No point doing this, because WNetGetConnection is even slower than
2669 GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
2670 GetDriveType is about the only call of this type which does not
2671 involve network access, and so is extremely quick). */
2672
2673 /* Map drive letter to UNC if remote. */
2674 if (isalpha (root_dir[0]) && !fixed[DRIVE_INDEX (root_dir[0])])
2675 {
2676 char remote_name[ 256 ];
2677 char drive[3] = { root_dir[0], ':' };
2678
2679 if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
2680 == NO_ERROR)
2681 /* do something */ ;
2682 }
2683#endif
2684
2685 info = lookup_volume_info (root_dir);
2686
2687 if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
2688 {
2689 char name[ 256 ];
2690 DWORD serialnum;
2691 DWORD maxcomp;
2692 DWORD flags;
2693 char type[ 256 ];
2694
2695 /* Info is not cached, or is stale. */
2696 if (!GetVolumeInformation (root_dir,
2697 name, sizeof (name),
2698 &serialnum,
2699 &maxcomp,
2700 &flags,
2701 type, sizeof (type)))
2702 return NULL;
2703
2704 /* Cache the volume information for future use, overwriting existing
2705 entry if present. */
2706 if (info == NULL)
2707 {
2708 info = xmalloc (sizeof (volume_info_data));
2709 add_volume_info (root_dir, info);
2710 }
2711 else
2712 {
2713 xfree (info->name);
2714 xfree (info->type);
2715 }
2716
2717 info->name = xstrdup (name);
2718 info->serialnum = serialnum;
2719 info->maxcomp = maxcomp;
2720 info->flags = flags;
2721 info->type = xstrdup (type);
2722 info->timestamp = GetTickCount ();
2723 }
2724
2725 return info;
2726}
2727
2728/* Get information on the volume where NAME is held; set path pointer to
2729 start of pathname in NAME (past UNC header\volume header if present),
2730 if pPath is non-NULL.
2731
2732 Note: if NAME includes symlinks, the information is for the volume
2733 of the symlink, not of its target. That's because, even though
2734 GetVolumeInformation returns information about the symlink target
2735 of its argument, we only pass the root directory to
2736 GetVolumeInformation, not the full NAME. */
2737static int
2738get_volume_info (const char * name, const char ** pPath)
2739{
2740 char temp[MAX_PATH];
2741 char *rootname = NULL; /* default to current volume */
2742 volume_info_data * info;
2743
2744 if (name == NULL)
2745 return FALSE;
2746
2747 /* Find the root name of the volume if given. */
2748 if (isalpha (name[0]) && name[1] == ':')
2749 {
2750 rootname = temp;
2751 temp[0] = *name++;
2752 temp[1] = *name++;
2753 temp[2] = '\\';
2754 temp[3] = 0;
2755 }
2756 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
2757 {
2758 char *str = temp;
2759 int slashes = 4;
2760 int dbcs_p = max_filename_mbslen () > 1;
2761
2762 rootname = temp;
2763 do
2764 {
2765 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
2766 break;
2767 if (!dbcs_p)
2768 *str++ = *name++;
2769 else
2770 {
2771 const char *p = name;
2772
2773 name = CharNextExA (file_name_codepage, name, 0);
2774 memcpy (str, p, name - p);
2775 str += name - p;
2776 }
2777 }
2778 while ( *name );
2779
2780 *str++ = '\\';
2781 *str = 0;
2782 }
2783
2784 if (pPath)
2785 *pPath = name;
2786
2787 info = GetCachedVolumeInformation (rootname);
2788 if (info != NULL)
2789 {
2790 /* Set global referenced by other functions. */
2791 volume_info = *info;
2792 return TRUE;
2793 }
2794 return FALSE;
2795}
2796
2797/* Determine if volume is FAT format (ie. only supports short 8.3
2798 names); also set path pointer to start of pathname in name, if
2799 pPath is non-NULL. */
2800static int
2801is_fat_volume (const char * name, const char ** pPath)
2802{
2803 if (get_volume_info (name, pPath))
2804 return (volume_info.maxcomp == 12);
2805 return FALSE;
2806}
2807
2808/* Map filename to a valid 8.3 name if necessary.
2809 The result is a pointer to a static buffer, so CAVEAT EMPTOR! */
2810const char *
2811map_w32_filename (const char * name, const char ** pPath)
2812{
2813 static char shortname[MAX_PATH];
2814 char * str = shortname;
2815 char c;
2816 char * path;
2817 const char * save_name = name;
2818
2819 if (strlen (name) >= MAX_PATH)
2820 {
2821 /* Return a filename which will cause callers to fail. */
2822 strcpy (shortname, "?");
2823 return shortname;
2824 }
2825
2826 if (is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
2827 {
2828 register int left = 8; /* maximum number of chars in part */
2829 register int extn = 0; /* extension added? */
2830 register int dots = 2; /* maximum number of dots allowed */
2831
2832 while (name < path)
2833 *str++ = *name++; /* skip past UNC header */
2834
2835 while ((c = *name++))
2836 {
2837 switch ( c )
2838 {
2839 case ':':
2840 case '\\':
2841 case '/':
2842 *str++ = (c == ':' ? ':' : '\\');
2843 extn = 0; /* reset extension flags */
2844 dots = 2; /* max 2 dots */
2845 left = 8; /* max length 8 for main part */
2846 break;
2847 case '.':
2848 if ( dots )
2849 {
2850 /* Convert path components of the form .xxx to _xxx,
2851 but leave . and .. as they are. This allows .emacs
2852 to be read as _emacs, for example. */
2853
2854 if (! *name ||
2855 *name == '.' ||
2856 IS_DIRECTORY_SEP (*name))
2857 {
2858 *str++ = '.';
2859 dots--;
2860 }
2861 else
2862 {
2863 *str++ = '_';
2864 left--;
2865 dots = 0;
2866 }
2867 }
2868 else if ( !extn )
2869 {
2870 *str++ = '.';
2871 extn = 1; /* we've got an extension */
2872 left = 3; /* 3 chars in extension */
2873 }
2874 else
2875 {
2876 /* any embedded dots after the first are converted to _ */
2877 *str++ = '_';
2878 }
2879 break;
2880 case '~':
2881 case '#': /* don't lose these, they're important */
2882 if ( ! left )
2883 str[-1] = c; /* replace last character of part */
2884 /* FALLTHRU */
2885 default:
2886 if ( left )
2887 {
2888 *str++ = tolower (c); /* map to lower case (looks nicer) */
2889 left--;
2890 dots = 0; /* started a path component */
2891 }
2892 break;
2893 }
2894 }
2895 *str = '\0';
2896 }
2897 else
2898 {
2899 strcpy (shortname, name);
2900 unixtodos_filename (shortname);
2901 }
2902
2903 if (pPath)
2904 *pPath = shortname + (path - save_name);
2905
2906 return shortname;
2907}
2908
2909static int
2910is_exec (const char * name)
2911{
2912 char * p = strrchr (name, '.');
2913 return
2914 (p != NULL
2915 && (xstrcasecmp (p, ".exe") == 0 ||
2916 xstrcasecmp (p, ".com") == 0 ||
2917 xstrcasecmp (p, ".bat") == 0 ||
2918 xstrcasecmp (p, ".cmd") == 0));
2919}
2920
2921/* Emulate the Unix directory procedures opendir, closedir,
2922 and readdir. We can't use the procedures supplied in sysdep.c,
2923 so we provide them here. */
2924
2925struct dirent dir_static; /* simulated directory contents */
2926static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
2927static int dir_is_fat;
2928static char dir_pathname[MAXPATHLEN+1];
2929static WIN32_FIND_DATA dir_find_data;
2930
2931/* Support shares on a network resource as subdirectories of a read-only
2932 root directory. */
2933static HANDLE wnet_enum_handle = INVALID_HANDLE_VALUE;
2934static HANDLE open_unc_volume (const char *);
2935static char *read_unc_volume (HANDLE, char *, int);
2936static void close_unc_volume (HANDLE);
2937
2938DIR *
2939opendir (const char *filename)
2940{
2941 DIR *dirp;
2942
2943 /* Opening is done by FindFirstFile. However, a read is inherent to
2944 this operation, so we defer the open until read time. */
2945
2946 if (dir_find_handle != INVALID_HANDLE_VALUE)
2947 return NULL;
2948 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2949 return NULL;
2950
2951 /* Note: We don't support traversal of UNC volumes via symlinks.
2952 Doing so would mean punishing 99.99% of use cases by resolving
2953 all the possible symlinks in FILENAME, recursively. */
2954 if (is_unc_volume (filename))
2955 {
2956 wnet_enum_handle = open_unc_volume (filename);
2957 if (wnet_enum_handle == INVALID_HANDLE_VALUE)
2958 return NULL;
2959 }
2960
2961 if (!(dirp = (DIR *) malloc (sizeof (DIR))))
2962 return NULL;
2963
2964 dirp->dd_fd = 0;
2965 dirp->dd_loc = 0;
2966 dirp->dd_size = 0;
2967
2968 strncpy (dir_pathname, map_w32_filename (filename, NULL), MAXPATHLEN);
2969 dir_pathname[MAXPATHLEN] = '\0';
2970 /* Note: We don't support symlinks to file names on FAT volumes.
2971 Doing so would mean punishing 99.99% of use cases by resolving
2972 all the possible symlinks in FILENAME, recursively. */
2973 dir_is_fat = is_fat_volume (filename, NULL);
2974
2975 return dirp;
2976}
2977
2978void
2979closedir (DIR *dirp)
2980{
2981 /* If we have a find-handle open, close it. */
2982 if (dir_find_handle != INVALID_HANDLE_VALUE)
2983 {
2984 FindClose (dir_find_handle);
2985 dir_find_handle = INVALID_HANDLE_VALUE;
2986 }
2987 else if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2988 {
2989 close_unc_volume (wnet_enum_handle);
2990 wnet_enum_handle = INVALID_HANDLE_VALUE;
2991 }
2992 xfree ((char *) dirp);
2993}
2994
2995struct dirent *
2996readdir (DIR *dirp)
2997{
2998 int downcase = !NILP (Vw32_downcase_file_names);
2999
3000 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
3001 {
3002 if (!read_unc_volume (wnet_enum_handle,
3003 dir_find_data.cFileName,
3004 MAX_PATH))
3005 return NULL;
3006 }
3007 /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
3008 else if (dir_find_handle == INVALID_HANDLE_VALUE)
3009 {
3010 char filename[MAXNAMLEN + 3];
3011 int ln;
3012 int dbcs_p = max_filename_mbslen () > 1;
3013
3014 strcpy (filename, dir_pathname);
3015 ln = strlen (filename) - 1;
3016 if (!dbcs_p)
3017 {
3018 if (!IS_DIRECTORY_SEP (filename[ln]))
3019 strcat (filename, "\\");
3020 }
3021 else
3022 {
3023 char *end = filename + ln + 1;
3024 char *last_char = CharPrevExA (file_name_codepage, filename, end, 0);
3025
3026 if (!IS_DIRECTORY_SEP (*last_char))
3027 strcat (filename, "\\");
3028 }
3029 strcat (filename, "*");
3030
3031 /* Note: No need to resolve symlinks in FILENAME, because
3032 FindFirst opens the directory that is the target of a
3033 symlink. */
3034 dir_find_handle = FindFirstFile (filename, &dir_find_data);
3035
3036 if (dir_find_handle == INVALID_HANDLE_VALUE)
3037 return NULL;
3038 }
3039 else
3040 {
3041 if (!FindNextFile (dir_find_handle, &dir_find_data))
3042 return NULL;
3043 }
3044
3045 /* Emacs never uses this value, so don't bother making it match
3046 value returned by stat(). */
3047 dir_static.d_ino = 1;
3048
3049 strcpy (dir_static.d_name, dir_find_data.cFileName);
3050
3051 /* If the file name in cFileName[] includes `?' characters, it means
3052 the original file name used characters that cannot be represented
3053 by the current ANSI codepage. To avoid total lossage, retrieve
3054 the short 8+3 alias of the long file name. */
3055 if (_mbspbrk (dir_static.d_name, "?"))
3056 {
3057 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
3058 downcase = 1; /* 8+3 aliases are returned in all caps */
3059 }
3060 dir_static.d_namlen = strlen (dir_static.d_name);
3061 dir_static.d_reclen = sizeof (struct dirent) - MAXNAMLEN + 3 +
3062 dir_static.d_namlen - dir_static.d_namlen % 4;
3063
3064 /* If the file name in cFileName[] includes `?' characters, it means
3065 the original file name used characters that cannot be represented
3066 by the current ANSI codepage. To avoid total lossage, retrieve
3067 the short 8+3 alias of the long file name. */
3068 if (_mbspbrk (dir_find_data.cFileName, "?"))
3069 {
3070 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
3071 /* 8+3 aliases are returned in all caps, which could break
3072 various alists that look at filenames' extensions. */
3073 downcase = 1;
3074 }
3075 else
3076 strcpy (dir_static.d_name, dir_find_data.cFileName);
3077 dir_static.d_namlen = strlen (dir_static.d_name);
3078 if (dir_is_fat)
3079 _mbslwr (dir_static.d_name);
3080 else if (downcase)
3081 {
3082 register char *p;
3083 int dbcs_p = max_filename_mbslen () > 1;
3084 for (p = dir_static.d_name; *p; )
3085 {
3086 if (*p >= 'a' && *p <= 'z')
3087 break;
3088 if (dbcs_p)
3089 p = CharNextExA (file_name_codepage, p, 0);
3090 else
3091 p++;
3092 }
3093 if (!*p)
3094 _mbslwr (dir_static.d_name);
3095 }
3096
3097 return &dir_static;
3098}
3099
3100static HANDLE
3101open_unc_volume (const char *path)
3102{
3103 NETRESOURCE nr;
3104 HANDLE henum;
3105 int result;
3106
3107 nr.dwScope = RESOURCE_GLOBALNET;
3108 nr.dwType = RESOURCETYPE_DISK;
3109 nr.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER;
3110 nr.dwUsage = RESOURCEUSAGE_CONTAINER;
3111 nr.lpLocalName = NULL;
3112 nr.lpRemoteName = (LPSTR)map_w32_filename (path, NULL);
3113 nr.lpComment = NULL;
3114 nr.lpProvider = NULL;
3115
3116 result = WNetOpenEnum (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
3117 RESOURCEUSAGE_CONNECTABLE, &nr, &henum);
3118
3119 if (result == NO_ERROR)
3120 return henum;
3121 else
3122 return INVALID_HANDLE_VALUE;
3123}
3124
3125static char *
3126read_unc_volume (HANDLE henum, char *readbuf, int size)
3127{
3128 DWORD count;
3129 int result;
3130 DWORD bufsize = 512;
3131 char *buffer;
3132 char *ptr;
3133 int dbcs_p = max_filename_mbslen () > 1;
3134
3135 count = 1;
3136 buffer = alloca (bufsize);
3137 result = WNetEnumResource (henum, &count, buffer, &bufsize);
3138 if (result != NO_ERROR)
3139 return NULL;
3140
3141 /* WNetEnumResource returns \\resource\share...skip forward to "share". */
3142 ptr = ((LPNETRESOURCE) buffer)->lpRemoteName;
3143 ptr += 2;
3144 if (!dbcs_p)
3145 while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
3146 else
3147 {
3148 while (*ptr && !IS_DIRECTORY_SEP (*ptr))
3149 ptr = CharNextExA (file_name_codepage, ptr, 0);
3150 }
3151 ptr++;
3152
3153 strncpy (readbuf, ptr, size);
3154 return readbuf;
3155}
3156
3157static void
3158close_unc_volume (HANDLE henum)
3159{
3160 if (henum != INVALID_HANDLE_VALUE)
3161 WNetCloseEnum (henum);
3162}
3163
3164static DWORD
3165unc_volume_file_attributes (const char *path)
3166{
3167 HANDLE henum;
3168 DWORD attrs;
3169
3170 henum = open_unc_volume (path);
3171 if (henum == INVALID_HANDLE_VALUE)
3172 return -1;
3173
3174 attrs = FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY;
3175
3176 close_unc_volume (henum);
3177
3178 return attrs;
3179}
3180
3181/* Ensure a network connection is authenticated. */
3182static void
3183logon_network_drive (const char *path)
3184{
3185 NETRESOURCE resource;
3186 char share[MAX_PATH];
3187 int n_slashes;
3188 char drive[4];
3189 UINT drvtype;
3190 char *p;
3191 int dbcs_p;
3192
3193 if (IS_DIRECTORY_SEP (path[0]) && IS_DIRECTORY_SEP (path[1]))
3194 drvtype = DRIVE_REMOTE;
3195 else if (path[0] == '\0' || path[1] != ':')
3196 drvtype = GetDriveType (NULL);
3197 else
3198 {
3199 drive[0] = path[0];
3200 drive[1] = ':';
3201 drive[2] = '\\';
3202 drive[3] = '\0';
3203 drvtype = GetDriveType (drive);
3204 }
3205
3206 /* Only logon to networked drives. */
3207 if (drvtype != DRIVE_REMOTE)
3208 return;
3209
3210 n_slashes = 2;
3211 strncpy (share, path, MAX_PATH);
3212 /* Truncate to just server and share name. */
3213 dbcs_p = max_filename_mbslen () > 1;
3214 for (p = share + 2; *p && p < share + MAX_PATH; )
3215 {
3216 if (IS_DIRECTORY_SEP (*p) && ++n_slashes > 3)
3217 {
3218 *p = '\0';
3219 break;
3220 }
3221 if (dbcs_p)
3222 p = CharNextExA (file_name_codepage, p, 0);
3223 else
3224 p++;
3225 }
3226
3227 resource.dwType = RESOURCETYPE_DISK;
3228 resource.lpLocalName = NULL;
3229 resource.lpRemoteName = share;
3230 resource.lpProvider = NULL;
3231
3232 WNetAddConnection2 (&resource, NULL, NULL, CONNECT_INTERACTIVE);
3233}
3234
3235/* Emulate faccessat(2). */
3236int
3237faccessat (int dirfd, const char * path, int mode, int flags)
3238{
3239 DWORD attributes;
3240
3241 if (dirfd != AT_FDCWD
3242 && !(IS_DIRECTORY_SEP (path[0])
3243 || IS_DEVICE_SEP (path[1])))
3244 {
3245 errno = EBADF;
3246 return -1;
3247 }
3248
3249 /* MSVCRT implementation of 'access' doesn't recognize D_OK, and its
3250 newer versions blow up when passed D_OK. */
3251 path = map_w32_filename (path, NULL);
3252 /* If the last element of PATH is a symlink, we need to resolve it
3253 to get the attributes of its target file. Note: any symlinks in
3254 PATH elements other than the last one are transparently resolved
3255 by GetFileAttributes below. */
3256 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0
3257 && (flags & AT_SYMLINK_NOFOLLOW) == 0)
3258 path = chase_symlinks (path);
3259
3260 if ((attributes = GetFileAttributes (path)) == -1)
3261 {
3262 DWORD w32err = GetLastError ();
3263
3264 switch (w32err)
3265 {
3266 case ERROR_INVALID_NAME:
3267 case ERROR_BAD_PATHNAME:
3268 if (is_unc_volume (path))
3269 {
3270 attributes = unc_volume_file_attributes (path);
3271 if (attributes == -1)
3272 {
3273 errno = EACCES;
3274 return -1;
3275 }
3276 break;
3277 }
3278 /* FALLTHROUGH */
3279 case ERROR_FILE_NOT_FOUND:
3280 case ERROR_BAD_NETPATH:
3281 errno = ENOENT;
3282 break;
3283 default:
3284 errno = EACCES;
3285 break;
3286 }
3287 return -1;
3288 }
3289 if ((mode & X_OK) != 0
3290 && !(is_exec (path) || (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0))
3291 {
3292 errno = EACCES;
3293 return -1;
3294 }
3295 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
3296 {
3297 errno = EACCES;
3298 return -1;
3299 }
3300 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
3301 {
3302 errno = EACCES;
3303 return -1;
3304 }
3305 return 0;
3306}
3307
3308/* A version of 'access' to be used locally with file names in
3309 locale-specific encoding. Does not resolve symlinks and does not
3310 support file names on FAT12 and FAT16 volumes, but that's OK, since
3311 we only invoke this function for files inside the Emacs source or
3312 installation tree, on directories (so any symlinks should have the
3313 directory bit set), and on short file names such as "C:/.emacs". */
3314static int
3315sys_access (const char *fname, int mode)
3316{
3317 char fname_copy[MAX_PATH], *p;
3318 DWORD attributes;
3319
3320 strcpy (fname_copy, fname);
3321 /* Do the equivalent of unixtodos_filename. */
3322 for (p = fname_copy; *p; p = CharNext (p))
3323 if (*p == '/')
3324 *p = '\\';
3325
3326 if ((attributes = GetFileAttributesA (fname_copy)) == -1)
3327 {
3328 DWORD w32err = GetLastError ();
3329
3330 switch (w32err)
3331 {
3332 case ERROR_INVALID_NAME:
3333 case ERROR_BAD_PATHNAME:
3334 case ERROR_FILE_NOT_FOUND:
3335 case ERROR_BAD_NETPATH:
3336 errno = ENOENT;
3337 break;
3338 default:
3339 errno = EACCES;
3340 break;
3341 }
3342 return -1;
3343 }
3344 if ((mode & X_OK) != 0
3345 && !(is_exec (fname_copy)
3346 || (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0))
3347 {
3348 errno = EACCES;
3349 return -1;
3350 }
3351 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
3352 {
3353 errno = EACCES;
3354 return -1;
3355 }
3356 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
3357 {
3358 errno = EACCES;
3359 return -1;
3360 }
3361 return 0;
3362}
3363
3364/* Shadow some MSVC runtime functions to map requests for long filenames
3365 to reasonable short names if necessary. This was originally added to
3366 permit running Emacs on NT 3.1 on a FAT partition, which doesn't support
3367 long file names. */
3368
3369int
3370sys_chdir (const char * path)
3371{
3372 /* FIXME: Temporary. Also, figure out what to do with
3373 map_w32_filename, as the original code did this:
3374 _chdir(map_w32_filename (path, NULL)). */
3375 if (w32_unicode_filenames)
3376 {
3377 wchar_t newdir[MAXPATHLEN];
3378
3379 if (filename_to_utf16 (path, newdir) == 0)
3380 return _wchdir (newdir);
3381 return -1;
3382 }
3383 else
3384 {
3385 char newdir[MAXPATHLEN];
3386
3387 if (filename_to_ansi (path, newdir) == 0)
3388 return _chdir (path);
3389 return -1;
3390 }
3391}
3392
3393int
3394sys_chmod (const char * path, int mode)
3395{
3396 path = chase_symlinks (map_w32_filename (path, NULL));
3397 return _chmod (path, mode);
3398}
3399
3400int
3401sys_creat (const char * path, int mode)
3402{
3403 return _creat (map_w32_filename (path, NULL), mode);
3404}
3405
3406FILE *
3407sys_fopen (const char * path, const char * mode)
3408{
3409 int fd;
3410 int oflag;
3411 const char * mode_save = mode;
3412
3413 /* Force all file handles to be non-inheritable. This is necessary to
3414 ensure child processes don't unwittingly inherit handles that might
3415 prevent future file access. */
3416
3417 if (mode[0] == 'r')
3418 oflag = O_RDONLY;
3419 else if (mode[0] == 'w' || mode[0] == 'a')
3420 oflag = O_WRONLY | O_CREAT | O_TRUNC;
3421 else
3422 return NULL;
3423
3424 /* Only do simplistic option parsing. */
3425 while (*++mode)
3426 if (mode[0] == '+')
3427 {
3428 oflag &= ~(O_RDONLY | O_WRONLY);
3429 oflag |= O_RDWR;
3430 }
3431 else if (mode[0] == 'b')
3432 {
3433 oflag &= ~O_TEXT;
3434 oflag |= O_BINARY;
3435 }
3436 else if (mode[0] == 't')
3437 {
3438 oflag &= ~O_BINARY;
3439 oflag |= O_TEXT;
3440 }
3441 else break;
3442
3443 fd = _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
3444 if (fd < 0)
3445 return NULL;
3446
3447 return _fdopen (fd, mode_save);
3448}
3449
3450/* This only works on NTFS volumes, but is useful to have. */
3451int
3452sys_link (const char * old, const char * new)
3453{
3454 HANDLE fileh;
3455 int result = -1;
3456 char oldname[MAX_PATH], newname[MAX_PATH];
3457
3458 if (old == NULL || new == NULL)
3459 {
3460 errno = ENOENT;
3461 return -1;
3462 }
3463
3464 strcpy (oldname, map_w32_filename (old, NULL));
3465 strcpy (newname, map_w32_filename (new, NULL));
3466
3467 fileh = CreateFile (oldname, 0, 0, NULL, OPEN_EXISTING,
3468 FILE_FLAG_BACKUP_SEMANTICS, NULL);
3469 if (fileh != INVALID_HANDLE_VALUE)
3470 {
3471 int wlen;
3472
3473 /* Confusingly, the "alternate" stream name field does not apply
3474 when restoring a hard link, and instead contains the actual
3475 stream data for the link (ie. the name of the link to create).
3476 The WIN32_STREAM_ID structure before the cStreamName field is
3477 the stream header, which is then immediately followed by the
3478 stream data. */
3479
3480 struct {
3481 WIN32_STREAM_ID wid;
3482 WCHAR wbuffer[MAX_PATH]; /* extra space for link name */
3483 } data;
3484
3485 wlen = MultiByteToWideChar (CP_ACP, MB_PRECOMPOSED, newname, -1,
3486 data.wid.cStreamName, MAX_PATH);
3487 if (wlen > 0)
3488 {
3489 LPVOID context = NULL;
3490 DWORD wbytes = 0;
3491
3492 data.wid.dwStreamId = BACKUP_LINK;
3493 data.wid.dwStreamAttributes = 0;
3494 data.wid.Size.LowPart = wlen * sizeof (WCHAR);
3495 data.wid.Size.HighPart = 0;
3496 data.wid.dwStreamNameSize = 0;
3497
3498 if (BackupWrite (fileh, (LPBYTE)&data,
3499 offsetof (WIN32_STREAM_ID, cStreamName)
3500 + data.wid.Size.LowPart,
3501 &wbytes, FALSE, FALSE, &context)
3502 && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
3503 {
3504 /* succeeded */
3505 result = 0;
3506 }
3507 else
3508 {
3509 /* Should try mapping GetLastError to errno; for now just
3510 indicate a general error (eg. links not supported). */
3511 errno = EINVAL; // perhaps EMLINK?
3512 }
3513 }
3514
3515 CloseHandle (fileh);
3516 }
3517 else
3518 errno = ENOENT;
3519
3520 return result;
3521}
3522
3523int
3524sys_mkdir (const char * path)
3525{
3526 return _mkdir (map_w32_filename (path, NULL));
3527}
3528
3529int
3530sys_open (const char * path, int oflag, int mode)
3531{
3532 const char* mpath = map_w32_filename (path, NULL);
3533 int res = -1;
3534
3535 /* If possible, try to open file without _O_CREAT, to be able to
3536 write to existing hidden and system files. Force all file
3537 handles to be non-inheritable. */
3538 if ((oflag & (_O_CREAT | _O_EXCL)) != (_O_CREAT | _O_EXCL))
3539 res = _open (mpath, (oflag & ~_O_CREAT) | _O_NOINHERIT, mode);
3540 if (res < 0)
3541 res = _open (mpath, oflag | _O_NOINHERIT, mode);
3542
3543 return res;
3544}
3545
3546/* Implementation of mkostemp for MS-Windows, to avoid race conditions
3547 when using mktemp.
3548
3549 Standard algorithm for generating a temporary file name seems to be
3550 use pid or tid with a letter on the front (in place of the 6 X's)
3551 and cycle through the letters to find a unique name. We extend
3552 that to allow any reasonable character as the first of the 6 X's,
3553 so that the number of simultaneously used temporary files will be
3554 greater. */
3555
3556int
3557mkostemp (char * template, int flags)
3558{
3559 char * p;
3560 int i, fd = -1;
3561 unsigned uid = GetCurrentThreadId ();
3562 int save_errno = errno;
3563 static char first_char[] = "abcdefghijklmnopqrstuvwyz0123456789!%-_@#";
3564
3565 errno = EINVAL;
3566 if (template == NULL)
3567 return -1;
3568
3569 p = template + strlen (template);
3570 i = 5;
3571 /* replace up to the last 5 X's with uid in decimal */
3572 while (--p >= template && p[0] == 'X' && --i >= 0)
3573 {
3574 p[0] = '0' + uid % 10;
3575 uid /= 10;
3576 }
3577
3578 if (i < 0 && p[0] == 'X')
3579 {
3580 i = 0;
3581 do
3582 {
3583 p[0] = first_char[i];
3584 if ((fd = sys_open (template,
3585 flags | _O_CREAT | _O_EXCL | _O_RDWR,
3586 S_IRUSR | S_IWUSR)) >= 0
3587 || errno != EEXIST)
3588 {
3589 if (fd >= 0)
3590 errno = save_errno;
3591 return fd;
3592 }
3593 }
3594 while (++i < sizeof (first_char));
3595 }
3596
3597 /* Template is badly formed or else we can't generate a unique name. */
3598 return -1;
3599}
3600
3601int
3602fchmod (int fd, mode_t mode)
3603{
3604 return 0;
3605}
3606
3607int
3608sys_rename_replace (const char *oldname, const char *newname, BOOL force)
3609{
3610 BOOL result;
3611 char temp[MAX_PATH];
3612 int newname_dev;
3613 int oldname_dev;
3614
3615 /* MoveFile on Windows 95 doesn't correctly change the short file name
3616 alias in a number of circumstances (it is not easy to predict when
3617 just by looking at oldname and newname, unfortunately). In these
3618 cases, renaming through a temporary name avoids the problem.
3619
3620 A second problem on Windows 95 is that renaming through a temp name when
3621 newname is uppercase fails (the final long name ends up in
3622 lowercase, although the short alias might be uppercase) UNLESS the
3623 long temp name is not 8.3.
3624
3625 So, on Windows 95 we always rename through a temp name, and we make sure
3626 the temp name has a long extension to ensure correct renaming. */
3627
3628 strcpy (temp, map_w32_filename (oldname, NULL));
3629
3630 /* volume_info is set indirectly by map_w32_filename. */
3631 oldname_dev = volume_info.serialnum;
3632
3633 if (os_subtype == OS_9X)
3634 {
3635 char * o;
3636 char * p;
3637 int i = 0;
3638
3639 oldname = map_w32_filename (oldname, NULL);
3640 if ((o = strrchr (oldname, '\\')))
3641 o++;
3642 else
3643 o = (char *) oldname;
3644
3645 if ((p = strrchr (temp, '\\')))
3646 p++;
3647 else
3648 p = temp;
3649
3650 do
3651 {
3652 /* Force temp name to require a manufactured 8.3 alias - this
3653 seems to make the second rename work properly. */
3654 sprintf (p, "_.%s.%u", o, i);
3655 i++;
3656 result = rename (oldname, temp);
3657 }
3658 /* This loop must surely terminate! */
3659 while (result < 0 && errno == EEXIST);
3660 if (result < 0)
3661 return -1;
3662 }
3663
3664 /* If FORCE, emulate Unix behavior - newname is deleted if it already exists
3665 (at least if it is a file; don't do this for directories).
3666
3667 Since we mustn't do this if we are just changing the case of the
3668 file name (we would end up deleting the file we are trying to
3669 rename!), we let rename detect if the destination file already
3670 exists - that way we avoid the possible pitfalls of trying to
3671 determine ourselves whether two names really refer to the same
3672 file, which is not always possible in the general case. (Consider
3673 all the permutations of shared or subst'd drives, etc.) */
3674
3675 newname = map_w32_filename (newname, NULL);
3676
3677 /* volume_info is set indirectly by map_w32_filename. */
3678 newname_dev = volume_info.serialnum;
3679
3680 result = rename (temp, newname);
3681
3682 if (result < 0 && force)
3683 {
3684 DWORD w32err = GetLastError ();
3685
3686 if (errno == EACCES
3687 && newname_dev != oldname_dev)
3688 {
3689 /* The implementation of `rename' on Windows does not return
3690 errno = EXDEV when you are moving a directory to a
3691 different storage device (ex. logical disk). It returns
3692 EACCES instead. So here we handle such situations and
3693 return EXDEV. */
3694 DWORD attributes;
3695
3696 if ((attributes = GetFileAttributes (temp)) != -1
3697 && (attributes & FILE_ATTRIBUTE_DIRECTORY))
3698 errno = EXDEV;
3699 }
3700 else if (errno == EEXIST)
3701 {
3702 if (_chmod (newname, 0666) != 0)
3703 return result;
3704 if (_unlink (newname) != 0)
3705 return result;
3706 result = rename (temp, newname);
3707 }
3708 else if (w32err == ERROR_PRIVILEGE_NOT_HELD
3709 && is_symlink (temp))
3710 {
3711 /* This is Windows prohibiting the user from creating a
3712 symlink in another place, since that requires
3713 privileges. */
3714 errno = EPERM;
3715 }
3716 }
3717
3718 return result;
3719}
3720
3721int
3722sys_rename (char const *old, char const *new)
3723{
3724 return sys_rename_replace (old, new, TRUE);
3725}
3726
3727int
3728sys_rmdir (const char * path)
3729{
3730 return _rmdir (map_w32_filename (path, NULL));
3731}
3732
3733int
3734sys_unlink (const char * path)
3735{
3736 path = map_w32_filename (path, NULL);
3737
3738 /* On Unix, unlink works without write permission. */
3739 _chmod (path, 0666);
3740 return _unlink (path);
3741}
3742
3743static FILETIME utc_base_ft;
3744static ULONGLONG utc_base; /* In 100ns units */
3745static int init = 0;
3746
3747#define FILETIME_TO_U64(result, ft) \
3748 do { \
3749 ULARGE_INTEGER uiTemp; \
3750 uiTemp.LowPart = (ft).dwLowDateTime; \
3751 uiTemp.HighPart = (ft).dwHighDateTime; \
3752 result = uiTemp.QuadPart; \
3753 } while (0)
3754
3755static void
3756initialize_utc_base (void)
3757{
3758 /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
3759 SYSTEMTIME st;
3760
3761 st.wYear = 1970;
3762 st.wMonth = 1;
3763 st.wDay = 1;
3764 st.wHour = 0;
3765 st.wMinute = 0;
3766 st.wSecond = 0;
3767 st.wMilliseconds = 0;
3768
3769 SystemTimeToFileTime (&st, &utc_base_ft);
3770 FILETIME_TO_U64 (utc_base, utc_base_ft);
3771}
3772
3773static time_t
3774convert_time (FILETIME ft)
3775{
3776 ULONGLONG tmp;
3777
3778 if (!init)
3779 {
3780 initialize_utc_base ();
3781 init = 1;
3782 }
3783
3784 if (CompareFileTime (&ft, &utc_base_ft) < 0)
3785 return 0;
3786
3787 FILETIME_TO_U64 (tmp, ft);
3788 return (time_t) ((tmp - utc_base) / 10000000L);
3789}
3790
3791static void
3792convert_from_time_t (time_t time, FILETIME * pft)
3793{
3794 ULARGE_INTEGER tmp;
3795
3796 if (!init)
3797 {
3798 initialize_utc_base ();
3799 init = 1;
3800 }
3801
3802 /* time in 100ns units since 1-Jan-1601 */
3803 tmp.QuadPart = (ULONGLONG) time * 10000000L + utc_base;
3804 pft->dwHighDateTime = tmp.HighPart;
3805 pft->dwLowDateTime = tmp.LowPart;
3806}
3807
3808static PSECURITY_DESCRIPTOR
3809get_file_security_desc_by_handle (HANDLE h)
3810{
3811 PSECURITY_DESCRIPTOR psd = NULL;
3812 DWORD err;
3813 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3814 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3815
3816 err = get_security_info (h, SE_FILE_OBJECT, si,
3817 NULL, NULL, NULL, NULL, &psd);
3818 if (err != ERROR_SUCCESS)
3819 return NULL;
3820
3821 return psd;
3822}
3823
3824static PSECURITY_DESCRIPTOR
3825get_file_security_desc_by_name (const char *fname)
3826{
3827 PSECURITY_DESCRIPTOR psd = NULL;
3828 DWORD sd_len, err;
3829 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3830 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3831
3832 if (!get_file_security (fname, si, psd, 0, &sd_len))
3833 {
3834 err = GetLastError ();
3835 if (err != ERROR_INSUFFICIENT_BUFFER)
3836 return NULL;
3837 }
3838
3839 psd = xmalloc (sd_len);
3840 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
3841 {
3842 xfree (psd);
3843 return NULL;
3844 }
3845
3846 return psd;
3847}
3848
3849static DWORD
3850get_rid (PSID sid)
3851{
3852 unsigned n_subauthorities;
3853
3854 /* Use the last sub-authority value of the RID, the relative
3855 portion of the SID, as user/group ID. */
3856 n_subauthorities = *get_sid_sub_authority_count (sid);
3857 if (n_subauthorities < 1)
3858 return 0; /* the "World" RID */
3859 return *get_sid_sub_authority (sid, n_subauthorities - 1);
3860}
3861
3862/* Caching SID and account values for faster lokup. */
3863
3864struct w32_id {
3865 unsigned rid;
3866 struct w32_id *next;
3867 char name[GNLEN+1];
3868 unsigned char sid[FLEXIBLE_ARRAY_MEMBER];
3869};
3870
3871static struct w32_id *w32_idlist;
3872
3873static int
3874w32_cached_id (PSID sid, unsigned *id, char *name)
3875{
3876 struct w32_id *tail, *found;
3877
3878 for (found = NULL, tail = w32_idlist; tail; tail = tail->next)
3879 {
3880 if (equal_sid ((PSID)tail->sid, sid))
3881 {
3882 found = tail;
3883 break;
3884 }
3885 }
3886 if (found)
3887 {
3888 *id = found->rid;
3889 strcpy (name, found->name);
3890 return 1;
3891 }
3892 else
3893 return 0;
3894}
3895
3896static void
3897w32_add_to_cache (PSID sid, unsigned id, char *name)
3898{
3899 DWORD sid_len;
3900 struct w32_id *new_entry;
3901
3902 /* We don't want to leave behind stale cache from when Emacs was
3903 dumped. */
3904 if (initialized)
3905 {
3906 sid_len = get_length_sid (sid);
3907 new_entry = xmalloc (offsetof (struct w32_id, sid) + sid_len);
3908 if (new_entry)
3909 {
3910 new_entry->rid = id;
3911 strcpy (new_entry->name, name);
3912 copy_sid (sid_len, (PSID)new_entry->sid, sid);
3913 new_entry->next = w32_idlist;
3914 w32_idlist = new_entry;
3915 }
3916 }
3917}
3918
3919#define UID 1
3920#define GID 2
3921
3922static int
3923get_name_and_id (PSECURITY_DESCRIPTOR psd, unsigned *id, char *nm, int what)
3924{
3925 PSID sid = NULL;
3926 BOOL dflt;
3927 SID_NAME_USE ignore;
3928 char name[UNLEN+1];
3929 DWORD name_len = sizeof (name);
3930 char domain[1024];
3931 DWORD domain_len = sizeof (domain);
3932 int use_dflt = 0;
3933 int result;
3934
3935 if (what == UID)
3936 result = get_security_descriptor_owner (psd, &sid, &dflt);
3937 else if (what == GID)
3938 result = get_security_descriptor_group (psd, &sid, &dflt);
3939 else
3940 result = 0;
3941
3942 if (!result || !is_valid_sid (sid))
3943 use_dflt = 1;
3944 else if (!w32_cached_id (sid, id, nm))
3945 {
3946 if (!lookup_account_sid (NULL, sid, name, &name_len,
3947 domain, &domain_len, &ignore)
3948 || name_len > UNLEN+1)
3949 use_dflt = 1;
3950 else
3951 {
3952 *id = get_rid (sid);
3953 strcpy (nm, name);
3954 w32_add_to_cache (sid, *id, name);
3955 }
3956 }
3957 return use_dflt;
3958}
3959
3960static void
3961get_file_owner_and_group (PSECURITY_DESCRIPTOR psd, struct stat *st)
3962{
3963 int dflt_usr = 0, dflt_grp = 0;
3964
3965 if (!psd)
3966 {
3967 dflt_usr = 1;
3968 dflt_grp = 1;
3969 }
3970 else
3971 {
3972 if (get_name_and_id (psd, &st->st_uid, st->st_uname, UID))
3973 dflt_usr = 1;
3974 if (get_name_and_id (psd, &st->st_gid, st->st_gname, GID))
3975 dflt_grp = 1;
3976 }
3977 /* Consider files to belong to current user/group, if we cannot get
3978 more accurate information. */
3979 if (dflt_usr)
3980 {
3981 st->st_uid = dflt_passwd.pw_uid;
3982 strcpy (st->st_uname, dflt_passwd.pw_name);
3983 }
3984 if (dflt_grp)
3985 {
3986 st->st_gid = dflt_passwd.pw_gid;
3987 strcpy (st->st_gname, dflt_group.gr_name);
3988 }
3989}
3990
3991/* Return non-zero if NAME is a potentially slow filesystem. */
3992int
3993is_slow_fs (const char *name)
3994{
3995 char drive_root[4];
3996 UINT devtype;
3997
3998 if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
3999 devtype = DRIVE_REMOTE; /* assume UNC name is remote */
4000 else if (!(strlen (name) >= 2 && IS_DEVICE_SEP (name[1])))
4001 devtype = GetDriveType (NULL); /* use root of current drive */
4002 else
4003 {
4004 /* GetDriveType needs the root directory of the drive. */
4005 strncpy (drive_root, name, 2);
4006 drive_root[2] = '\\';
4007 drive_root[3] = '\0';
4008 devtype = GetDriveType (drive_root);
4009 }
4010 return !(devtype == DRIVE_FIXED || devtype == DRIVE_RAMDISK);
4011}
4012
4013/* If this is non-zero, the caller wants accurate information about
4014 file's owner and group, which could be expensive to get. */
4015int w32_stat_get_owner_group;
4016
4017/* MSVC stat function can't cope with UNC names and has other bugs, so
4018 replace it with our own. This also allows us to calculate consistent
4019 inode values and owner/group without hacks in the main Emacs code. */
4020
4021static int
4022stat_worker (const char * path, struct stat * buf, int follow_symlinks)
4023{
4024 char *name, *save_name, *r;
4025 WIN32_FIND_DATA wfd;
4026 HANDLE fh;
4027 unsigned __int64 fake_inode = 0;
4028 int permission;
4029 int len;
4030 int rootdir = FALSE;
4031 PSECURITY_DESCRIPTOR psd = NULL;
4032 int is_a_symlink = 0;
4033 DWORD file_flags = FILE_FLAG_BACKUP_SEMANTICS;
4034 DWORD access_rights = 0;
4035 DWORD fattrs = 0, serialnum = 0, fs_high = 0, fs_low = 0, nlinks = 1;
4036 FILETIME ctime, atime, wtime;
4037 int dbcs_p;
4038
4039 if (path == NULL || buf == NULL)
4040 {
4041 errno = EFAULT;
4042 return -1;
4043 }
4044
4045 save_name = name = (char *) map_w32_filename (path, &path);
4046 /* Must be valid filename, no wild cards or other invalid
4047 characters. We use _mbspbrk to support multibyte strings that
4048 might look to strpbrk as if they included literal *, ?, and other
4049 characters mentioned below that are disallowed by Windows
4050 filesystems. */
4051 if (_mbspbrk (name, "*?|<>\""))
4052 {
4053 errno = ENOENT;
4054 return -1;
4055 }
4056
4057 /* Remove trailing directory separator, unless name is the root
4058 directory of a drive or UNC volume in which case ensure there
4059 is a trailing separator. */
4060 len = strlen (name);
4061 name = strcpy (alloca (len + 2), name);
4062
4063 /* Avoid a somewhat costly call to is_symlink if the filesystem
4064 doesn't support symlinks. */
4065 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
4066 is_a_symlink = is_symlink (name);
4067
4068 /* Plan A: Open the file and get all the necessary information via
4069 the resulting handle. This solves several issues in one blow:
4070
4071 . retrieves attributes for the target of a symlink, if needed
4072 . gets attributes of root directories and symlinks pointing to
4073 root directories, thus avoiding the need for special-casing
4074 these and detecting them by examining the file-name format
4075 . retrieves more accurate attributes (e.g., non-zero size for
4076 some directories, esp. directories that are junction points)
4077 . correctly resolves "c:/..", "/.." and similar file names
4078 . avoids run-time penalties for 99% of use cases
4079
4080 Plan A is always tried first, unless the user asked not to (but
4081 if the file is a symlink and we need to follow links, we try Plan
4082 A even if the user asked not to).
4083
4084 If Plan A fails, we go to Plan B (below), where various
4085 potentially expensive techniques must be used to handle "special"
4086 files such as UNC volumes etc. */
4087 if (!(NILP (Vw32_get_true_file_attributes)
4088 || (EQ (Vw32_get_true_file_attributes, Qlocal) && is_slow_fs (name)))
4089 /* Following symlinks requires getting the info by handle. */
4090 || (is_a_symlink && follow_symlinks))
4091 {
4092 BY_HANDLE_FILE_INFORMATION info;
4093
4094 if (is_a_symlink && !follow_symlinks)
4095 file_flags |= FILE_FLAG_OPEN_REPARSE_POINT;
4096 /* READ_CONTROL access rights are required to get security info
4097 by handle. But if the OS doesn't support security in the
4098 first place, we don't need to try. */
4099 if (is_windows_9x () != TRUE)
4100 access_rights |= READ_CONTROL;
4101
4102 fh = CreateFile (name, access_rights, 0, NULL, OPEN_EXISTING,
4103 file_flags, NULL);
4104 /* If CreateFile fails with READ_CONTROL, try again with zero as
4105 access rights. */
4106 if (fh == INVALID_HANDLE_VALUE && access_rights)
4107 fh = CreateFile (name, 0, 0, NULL, OPEN_EXISTING,
4108 file_flags, NULL);
4109 if (fh == INVALID_HANDLE_VALUE)
4110 goto no_true_file_attributes;
4111
4112 /* This is more accurate in terms of getting the correct number
4113 of links, but is quite slow (it is noticeable when Emacs is
4114 making a list of file name completions). */
4115 if (GetFileInformationByHandle (fh, &info))
4116 {
4117 nlinks = info.nNumberOfLinks;
4118 /* Might as well use file index to fake inode values, but this
4119 is not guaranteed to be unique unless we keep a handle open
4120 all the time (even then there are situations where it is
4121 not unique). Reputedly, there are at most 48 bits of info
4122 (on NTFS, presumably less on FAT). */
4123 fake_inode = info.nFileIndexHigh;
4124 fake_inode <<= 32;
4125 fake_inode += info.nFileIndexLow;
4126 serialnum = info.dwVolumeSerialNumber;
4127 fs_high = info.nFileSizeHigh;
4128 fs_low = info.nFileSizeLow;
4129 ctime = info.ftCreationTime;
4130 atime = info.ftLastAccessTime;
4131 wtime = info.ftLastWriteTime;
4132 fattrs = info.dwFileAttributes;
4133 }
4134 else
4135 {
4136 /* We don't go to Plan B here, because it's not clear that
4137 it's a good idea. The only known use case where
4138 CreateFile succeeds, but GetFileInformationByHandle fails
4139 (with ERROR_INVALID_FUNCTION) is for character devices
4140 such as NUL, PRN, etc. For these, switching to Plan B is
4141 a net loss, because we lose the character device
4142 attribute returned by GetFileType below (FindFirstFile
4143 doesn't set that bit in the attributes), and the other
4144 fields don't make sense for character devices anyway.
4145 Emacs doesn't really care for non-file entities in the
4146 context of l?stat, so neither do we. */
4147
4148 /* w32err is assigned so one could put a breakpoint here and
4149 examine its value, when GetFileInformationByHandle
4150 fails. */
4151 DWORD w32err = GetLastError ();
4152
4153 switch (w32err)
4154 {
4155 case ERROR_FILE_NOT_FOUND: /* can this ever happen? */
4156 errno = ENOENT;
4157 return -1;
4158 }
4159 }
4160
4161 /* Test for a symlink before testing for a directory, since
4162 symlinks to directories have the directory bit set, but we
4163 don't want them to appear as directories. */
4164 if (is_a_symlink && !follow_symlinks)
4165 buf->st_mode = S_IFLNK;
4166 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4167 buf->st_mode = S_IFDIR;
4168 else
4169 {
4170 DWORD ftype = GetFileType (fh);
4171
4172 switch (ftype)
4173 {
4174 case FILE_TYPE_DISK:
4175 buf->st_mode = S_IFREG;
4176 break;
4177 case FILE_TYPE_PIPE:
4178 buf->st_mode = S_IFIFO;
4179 break;
4180 case FILE_TYPE_CHAR:
4181 case FILE_TYPE_UNKNOWN:
4182 default:
4183 buf->st_mode = S_IFCHR;
4184 }
4185 }
4186 /* We produce the fallback owner and group data, based on the
4187 current user that runs Emacs, in the following cases:
4188
4189 . caller didn't request owner and group info
4190 . this is Windows 9X
4191 . getting security by handle failed, and we need to produce
4192 information for the target of a symlink (this is better
4193 than producing a potentially misleading info about the
4194 symlink itself)
4195
4196 If getting security by handle fails, and we don't need to
4197 resolve symlinks, we try getting security by name. */
4198 if (!w32_stat_get_owner_group || is_windows_9x () == TRUE)
4199 get_file_owner_and_group (NULL, buf);
4200 else
4201 {
4202 psd = get_file_security_desc_by_handle (fh);
4203 if (psd)
4204 {
4205 get_file_owner_and_group (psd, buf);
4206 LocalFree (psd);
4207 }
4208 else if (!(is_a_symlink && follow_symlinks))
4209 {
4210 psd = get_file_security_desc_by_name (name);
4211 get_file_owner_and_group (psd, buf);
4212 xfree (psd);
4213 }
4214 else
4215 get_file_owner_and_group (NULL, buf);
4216 }
4217 CloseHandle (fh);
4218 }
4219 else
4220 {
4221 no_true_file_attributes:
4222 /* Plan B: Either getting a handle on the file failed, or the
4223 caller explicitly asked us to not bother making this
4224 information more accurate.
4225
4226 Implementation note: In Plan B, we never bother to resolve
4227 symlinks, even if we got here because we tried Plan A and
4228 failed. That's because, even if the caller asked for extra
4229 precision by setting Vw32_get_true_file_attributes to t,
4230 resolving symlinks requires acquiring a file handle to the
4231 symlink, which we already know will fail. And if the user
4232 did not ask for extra precision, resolving symlinks will fly
4233 in the face of that request, since the user then wants the
4234 lightweight version of the code. */
4235 dbcs_p = max_filename_mbslen () > 1;
4236 rootdir = (path >= save_name + len - 1
4237 && (IS_DIRECTORY_SEP (*path) || *path == 0));
4238
4239 /* If name is "c:/.." or "/.." then stat "c:/" or "/". */
4240 r = IS_DEVICE_SEP (name[1]) ? &name[2] : name;
4241 if (IS_DIRECTORY_SEP (r[0])
4242 && r[1] == '.' && r[2] == '.' && r[3] == '\0')
4243 r[1] = r[2] = '\0';
4244
4245 /* Note: If NAME is a symlink to the root of a UNC volume
4246 (i.e. "\\SERVER"), we will not detect that here, and we will
4247 return data about the symlink as result of FindFirst below.
4248 This is unfortunate, but that marginal use case does not
4249 justify a call to chase_symlinks which would impose a penalty
4250 on all the other use cases. (We get here for symlinks to
4251 roots of UNC volumes because CreateFile above fails for them,
4252 unlike with symlinks to root directories X:\ of drives.) */
4253 if (is_unc_volume (name))
4254 {
4255 fattrs = unc_volume_file_attributes (name);
4256 if (fattrs == -1)
4257 return -1;
4258
4259 ctime = atime = wtime = utc_base_ft;
4260 }
4261 else if (rootdir)
4262 {
4263 if (!dbcs_p)
4264 {
4265 if (!IS_DIRECTORY_SEP (name[len-1]))
4266 strcat (name, "\\");
4267 }
4268 else
4269 {
4270 char *end = name + len;
4271 char *n = CharPrevExA (file_name_codepage, name, end, 0);
4272
4273 if (!IS_DIRECTORY_SEP (*n))
4274 strcat (name, "\\");
4275 }
4276 if (GetDriveType (name) < 2)
4277 {
4278 errno = ENOENT;
4279 return -1;
4280 }
4281
4282 fattrs = FILE_ATTRIBUTE_DIRECTORY;
4283 ctime = atime = wtime = utc_base_ft;
4284 }
4285 else
4286 {
4287 if (!dbcs_p)
4288 {
4289 if (IS_DIRECTORY_SEP (name[len-1]))
4290 name[len - 1] = 0;
4291 }
4292 else
4293 {
4294 char *end = name + len;
4295 char *n = CharPrevExA (file_name_codepage, name, end, 0);
4296
4297 if (IS_DIRECTORY_SEP (*n))
4298 *n = 0;
4299 }
4300
4301 /* (This is hacky, but helps when doing file completions on
4302 network drives.) Optimize by using information available from
4303 active readdir if possible. */
4304 len = strlen (dir_pathname);
4305 if (!dbcs_p)
4306 {
4307 if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
4308 len--;
4309 }
4310 else
4311 {
4312 char *end = dir_pathname + len;
4313 char *n = CharPrevExA (file_name_codepage, dir_pathname, end, 0);
4314
4315 if (IS_DIRECTORY_SEP (*n))
4316 len--;
4317 }
4318 if (dir_find_handle != INVALID_HANDLE_VALUE
4319 && !(is_a_symlink && follow_symlinks)
4320 && strnicmp (save_name, dir_pathname, len) == 0
4321 && IS_DIRECTORY_SEP (name[len])
4322 && xstrcasecmp (name + len + 1, dir_static.d_name) == 0)
4323 {
4324 /* This was the last entry returned by readdir. */
4325 wfd = dir_find_data;
4326 }
4327 else
4328 {
4329 logon_network_drive (name);
4330
4331 fh = FindFirstFile (name, &wfd);
4332 if (fh == INVALID_HANDLE_VALUE)
4333 {
4334 errno = ENOENT;
4335 return -1;
4336 }
4337 FindClose (fh);
4338 }
4339 /* Note: if NAME is a symlink, the information we get from
4340 FindFirstFile is for the symlink, not its target. */
4341 fattrs = wfd.dwFileAttributes;
4342 ctime = wfd.ftCreationTime;
4343 atime = wfd.ftLastAccessTime;
4344 wtime = wfd.ftLastWriteTime;
4345 fs_high = wfd.nFileSizeHigh;
4346 fs_low = wfd.nFileSizeLow;
4347 fake_inode = 0;
4348 nlinks = 1;
4349 serialnum = volume_info.serialnum;
4350 }
4351 if (is_a_symlink && !follow_symlinks)
4352 buf->st_mode = S_IFLNK;
4353 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4354 buf->st_mode = S_IFDIR;
4355 else
4356 buf->st_mode = S_IFREG;
4357
4358 get_file_owner_and_group (NULL, buf);
4359 }
4360
4361#if 0
4362 /* Not sure if there is any point in this. */
4363 if (!NILP (Vw32_generate_fake_inodes))
4364 fake_inode = generate_inode_val (name);
4365 else if (fake_inode == 0)
4366 {
4367 /* For want of something better, try to make everything unique. */
4368 static DWORD gen_num = 0;
4369 fake_inode = ++gen_num;
4370 }
4371#endif
4372
4373 buf->st_ino = fake_inode;
4374
4375 buf->st_dev = serialnum;
4376 buf->st_rdev = serialnum;
4377
4378 buf->st_size = fs_high;
4379 buf->st_size <<= 32;
4380 buf->st_size += fs_low;
4381 buf->st_nlink = nlinks;
4382
4383 /* Convert timestamps to Unix format. */
4384 buf->st_mtime = convert_time (wtime);
4385 buf->st_atime = convert_time (atime);
4386 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
4387 buf->st_ctime = convert_time (ctime);
4388 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
4389
4390 /* determine rwx permissions */
4391 if (is_a_symlink && !follow_symlinks)
4392 permission = S_IREAD | S_IWRITE | S_IEXEC; /* Posix expectations */
4393 else
4394 {
4395 if (fattrs & FILE_ATTRIBUTE_READONLY)
4396 permission = S_IREAD;
4397 else
4398 permission = S_IREAD | S_IWRITE;
4399
4400 if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
4401 permission |= S_IEXEC;
4402 else if (is_exec (name))
4403 permission |= S_IEXEC;
4404 }
4405
4406 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
4407
4408 return 0;
4409}
4410
4411int
4412stat (const char * path, struct stat * buf)
4413{
4414 return stat_worker (path, buf, 1);
4415}
4416
4417int
4418lstat (const char * path, struct stat * buf)
4419{
4420 return stat_worker (path, buf, 0);
4421}
4422
4423int
4424fstatat (int fd, char const *name, struct stat *st, int flags)
4425{
4426 /* Rely on a hack: an open directory is modeled as file descriptor 0.
4427 This is good enough for the current usage in Emacs, but is fragile.
4428
4429 FIXME: Add proper support for fdopendir, fstatat, readlinkat.
4430 Gnulib does this and can serve as a model. */
4431 char fullname[MAX_PATH];
4432
4433 if (fd != AT_FDCWD)
4434 {
4435 if (_snprintf (fullname, sizeof fullname, "%s/%s", dir_pathname, name)
4436 < 0)
4437 {
4438 errno = ENAMETOOLONG;
4439 return -1;
4440 }
4441 name = fullname;
4442 }
4443
4444 return stat_worker (name, st, ! (flags & AT_SYMLINK_NOFOLLOW));
4445}
4446
4447/* Provide fstat and utime as well as stat for consistent handling of
4448 file timestamps. */
4449int
4450fstat (int desc, struct stat * buf)
4451{
4452 HANDLE fh = (HANDLE) _get_osfhandle (desc);
4453 BY_HANDLE_FILE_INFORMATION info;
4454 unsigned __int64 fake_inode;
4455 int permission;
4456
4457 switch (GetFileType (fh) & ~FILE_TYPE_REMOTE)
4458 {
4459 case FILE_TYPE_DISK:
4460 buf->st_mode = S_IFREG;
4461 if (!GetFileInformationByHandle (fh, &info))
4462 {
4463 errno = EACCES;
4464 return -1;
4465 }
4466 break;
4467 case FILE_TYPE_PIPE:
4468 buf->st_mode = S_IFIFO;
4469 goto non_disk;
4470 case FILE_TYPE_CHAR:
4471 case FILE_TYPE_UNKNOWN:
4472 default:
4473 buf->st_mode = S_IFCHR;
4474 non_disk:
4475 memset (&info, 0, sizeof (info));
4476 info.dwFileAttributes = 0;
4477 info.ftCreationTime = utc_base_ft;
4478 info.ftLastAccessTime = utc_base_ft;
4479 info.ftLastWriteTime = utc_base_ft;
4480 }
4481
4482 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4483 buf->st_mode = S_IFDIR;
4484
4485 buf->st_nlink = info.nNumberOfLinks;
4486 /* Might as well use file index to fake inode values, but this
4487 is not guaranteed to be unique unless we keep a handle open
4488 all the time (even then there are situations where it is
4489 not unique). Reputedly, there are at most 48 bits of info
4490 (on NTFS, presumably less on FAT). */
4491 fake_inode = info.nFileIndexHigh;
4492 fake_inode <<= 32;
4493 fake_inode += info.nFileIndexLow;
4494
4495 /* MSVC defines _ino_t to be short; other libc's might not. */
4496 if (sizeof (buf->st_ino) == 2)
4497 buf->st_ino = fake_inode ^ (fake_inode >> 16);
4498 else
4499 buf->st_ino = fake_inode;
4500
4501 /* If the caller so requested, get the true file owner and group.
4502 Otherwise, consider the file to belong to the current user. */
4503 if (!w32_stat_get_owner_group || is_windows_9x () == TRUE)
4504 get_file_owner_and_group (NULL, buf);
4505 else
4506 {
4507 PSECURITY_DESCRIPTOR psd = NULL;
4508
4509 psd = get_file_security_desc_by_handle (fh);
4510 if (psd)
4511 {
4512 get_file_owner_and_group (psd, buf);
4513 LocalFree (psd);
4514 }
4515 else
4516 get_file_owner_and_group (NULL, buf);
4517 }
4518
4519 buf->st_dev = info.dwVolumeSerialNumber;
4520 buf->st_rdev = info.dwVolumeSerialNumber;
4521
4522 buf->st_size = info.nFileSizeHigh;
4523 buf->st_size <<= 32;
4524 buf->st_size += info.nFileSizeLow;
4525
4526 /* Convert timestamps to Unix format. */
4527 buf->st_mtime = convert_time (info.ftLastWriteTime);
4528 buf->st_atime = convert_time (info.ftLastAccessTime);
4529 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
4530 buf->st_ctime = convert_time (info.ftCreationTime);
4531 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
4532
4533 /* determine rwx permissions */
4534 if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
4535 permission = S_IREAD;
4536 else
4537 permission = S_IREAD | S_IWRITE;
4538
4539 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4540 permission |= S_IEXEC;
4541 else
4542 {
4543#if 0 /* no way of knowing the filename */
4544 char * p = strrchr (name, '.');
4545 if (p != NULL &&
4546 (xstrcasecmp (p, ".exe") == 0 ||
4547 xstrcasecmp (p, ".com") == 0 ||
4548 xstrcasecmp (p, ".bat") == 0 ||
4549 xstrcasecmp (p, ".cmd") == 0))
4550 permission |= S_IEXEC;
4551#endif
4552 }
4553
4554 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
4555
4556 return 0;
4557}
4558
4559/* A version of 'utime' which handles directories as well as
4560 files. */
4561
4562int
4563utime (const char *name, struct utimbuf *times)
4564{
4565 struct utimbuf deftime;
4566 HANDLE fh;
4567 FILETIME mtime;
4568 FILETIME atime;
4569
4570 if (times == NULL)
4571 {
4572 deftime.modtime = deftime.actime = time (NULL);
4573 times = &deftime;
4574 }
4575
4576 if (w32_unicode_filenames)
4577 {
4578 wchar_t name_utf16[MAX_PATH];
4579
4580 if (filename_to_utf16 (name, name_utf16) != 0)
4581 return -1; /* errno set by filename_to_utf16 */
4582
4583 /* Need write access to set times. */
4584 fh = CreateFileW (name_utf16, FILE_WRITE_ATTRIBUTES,
4585 /* If NAME specifies a directory, FILE_SHARE_DELETE
4586 allows other processes to delete files inside it,
4587 while we have the directory open. */
4588 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
4589 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
4590 }
4591 else
4592 {
4593 char name_ansi[MAX_PATH];
4594
4595 if (filename_to_ansi (name, name_ansi) != 0)
4596 return -1; /* errno set by filename_to_ansi */
4597
4598 fh = CreateFileA (name_ansi, FILE_WRITE_ATTRIBUTES,
4599 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
4600 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
4601 }
4602 if (fh != INVALID_HANDLE_VALUE)
4603 {
4604 convert_from_time_t (times->actime, &atime);
4605 convert_from_time_t (times->modtime, &mtime);
4606 if (!SetFileTime (fh, NULL, &atime, &mtime))
4607 {
4608 CloseHandle (fh);
4609 errno = EACCES;
4610 return -1;
4611 }
4612 CloseHandle (fh);
4613 }
4614 else
4615 {
4616 DWORD err = GetLastError ();
4617
4618 switch (err)
4619 {
4620 case ERROR_FILE_NOT_FOUND:
4621 case ERROR_PATH_NOT_FOUND:
4622 case ERROR_INVALID_DRIVE:
4623 case ERROR_BAD_NETPATH:
4624 case ERROR_DEV_NOT_EXIST:
4625 /* ERROR_INVALID_NAME is the error CreateFile sets when the
4626 file name includes ?s, i.e. translation to ANSI failed. */
4627 case ERROR_INVALID_NAME:
4628 errno = ENOENT;
4629 break;
4630 case ERROR_TOO_MANY_OPEN_FILES:
4631 errno = ENFILE;
4632 break;
4633 case ERROR_ACCESS_DENIED:
4634 case ERROR_SHARING_VIOLATION:
4635 errno = EACCES;
4636 break;
4637 default:
4638 errno = EINVAL;
4639 break;
4640 }
4641 return -1;
4642 }
4643 return 0;
4644}
4645
4646\f
4647/* Symlink-related functions. */
4648#ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
4649#define SYMBOLIC_LINK_FLAG_DIRECTORY 0x1
4650#endif
4651
4652int
4653symlink (char const *filename, char const *linkname)
4654{
4655 char linkfn[MAX_PATH], *tgtfn;
4656 DWORD flags = 0;
4657 int dir_access, filename_ends_in_slash;
4658 int dbcs_p;
4659
4660 /* Diagnostics follows Posix as much as possible. */
4661 if (filename == NULL || linkname == NULL)
4662 {
4663 errno = EFAULT;
4664 return -1;
4665 }
4666 if (!*filename)
4667 {
4668 errno = ENOENT;
4669 return -1;
4670 }
4671 if (strlen (filename) > MAX_PATH || strlen (linkname) > MAX_PATH)
4672 {
4673 errno = ENAMETOOLONG;
4674 return -1;
4675 }
4676
4677 strcpy (linkfn, map_w32_filename (linkname, NULL));
4678 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0)
4679 {
4680 errno = EPERM;
4681 return -1;
4682 }
4683
4684 dbcs_p = max_filename_mbslen () > 1;
4685
4686 /* Note: since empty FILENAME was already rejected, we can safely
4687 refer to FILENAME[1]. */
4688 if (!(IS_DIRECTORY_SEP (filename[0]) || IS_DEVICE_SEP (filename[1])))
4689 {
4690 /* Non-absolute FILENAME is understood as being relative to
4691 LINKNAME's directory. We need to prepend that directory to
4692 FILENAME to get correct results from faccessat below, since
4693 otherwise it will interpret FILENAME relative to the
4694 directory where the Emacs process runs. Note that
4695 make-symbolic-link always makes sure LINKNAME is a fully
4696 expanded file name. */
4697 char tem[MAX_PATH];
4698 char *p = linkfn + strlen (linkfn);
4699
4700 if (!dbcs_p)
4701 {
4702 while (p > linkfn && !IS_ANY_SEP (p[-1]))
4703 p--;
4704 }
4705 else
4706 {
4707 char *p1 = CharPrevExA (file_name_codepage, linkfn, p, 0);
4708
4709 while (p > linkfn && !IS_ANY_SEP (*p1))
4710 {
4711 p = p1;
4712 p1 = CharPrevExA (file_name_codepage, linkfn, p1, 0);
4713 }
4714 }
4715 if (p > linkfn)
4716 strncpy (tem, linkfn, p - linkfn);
4717 tem[p - linkfn] = '\0';
4718 strcat (tem, filename);
4719 dir_access = faccessat (AT_FDCWD, tem, D_OK, AT_EACCESS);
4720 }
4721 else
4722 dir_access = faccessat (AT_FDCWD, filename, D_OK, AT_EACCESS);
4723
4724 /* Since Windows distinguishes between symlinks to directories and
4725 to files, we provide a kludgy feature: if FILENAME doesn't
4726 exist, but ends in a slash, we create a symlink to directory. If
4727 FILENAME exists and is a directory, we always create a symlink to
4728 directory. */
4729 if (!dbcs_p)
4730 filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
4731 else
4732 {
4733 const char *end = filename + strlen (filename);
4734 const char *n = CharPrevExA (file_name_codepage, filename, end, 0);
4735
4736 filename_ends_in_slash = IS_DIRECTORY_SEP (*n);
4737 }
4738 if (dir_access == 0 || filename_ends_in_slash)
4739 flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
4740
4741 tgtfn = (char *)map_w32_filename (filename, NULL);
4742 if (filename_ends_in_slash)
4743 tgtfn[strlen (tgtfn) - 1] = '\0';
4744
4745 errno = 0;
4746 if (!create_symbolic_link (linkfn, tgtfn, flags))
4747 {
4748 /* ENOSYS is set by create_symbolic_link, when it detects that
4749 the OS doesn't support the CreateSymbolicLink API. */
4750 if (errno != ENOSYS)
4751 {
4752 DWORD w32err = GetLastError ();
4753
4754 switch (w32err)
4755 {
4756 /* ERROR_SUCCESS is sometimes returned when LINKFN and
4757 TGTFN point to the same file name, go figure. */
4758 case ERROR_SUCCESS:
4759 case ERROR_FILE_EXISTS:
4760 errno = EEXIST;
4761 break;
4762 case ERROR_ACCESS_DENIED:
4763 errno = EACCES;
4764 break;
4765 case ERROR_FILE_NOT_FOUND:
4766 case ERROR_PATH_NOT_FOUND:
4767 case ERROR_BAD_NETPATH:
4768 case ERROR_INVALID_REPARSE_DATA:
4769 errno = ENOENT;
4770 break;
4771 case ERROR_DIRECTORY:
4772 errno = EISDIR;
4773 break;
4774 case ERROR_PRIVILEGE_NOT_HELD:
4775 case ERROR_NOT_ALL_ASSIGNED:
4776 errno = EPERM;
4777 break;
4778 case ERROR_DISK_FULL:
4779 errno = ENOSPC;
4780 break;
4781 default:
4782 errno = EINVAL;
4783 break;
4784 }
4785 }
4786 return -1;
4787 }
4788 return 0;
4789}
4790
4791/* A quick inexpensive test of whether FILENAME identifies a file that
4792 is a symlink. Returns non-zero if it is, zero otherwise. FILENAME
4793 must already be in the normalized form returned by
4794 map_w32_filename.
4795
4796 Note: for repeated operations on many files, it is best to test
4797 whether the underlying volume actually supports symlinks, by
4798 testing the FILE_SUPPORTS_REPARSE_POINTS bit in volume's flags, and
4799 avoid the call to this function if it doesn't. That's because the
4800 call to GetFileAttributes takes a non-negligible time, especially
4801 on non-local or removable filesystems. See stat_worker for an
4802 example of how to do that. */
4803static int
4804is_symlink (const char *filename)
4805{
4806 DWORD attrs;
4807 WIN32_FIND_DATA wfd;
4808 HANDLE fh;
4809
4810 attrs = GetFileAttributes (filename);
4811 if (attrs == -1)
4812 {
4813 DWORD w32err = GetLastError ();
4814
4815 switch (w32err)
4816 {
4817 case ERROR_BAD_NETPATH: /* network share, can't be a symlink */
4818 break;
4819 case ERROR_ACCESS_DENIED:
4820 errno = EACCES;
4821 break;
4822 case ERROR_FILE_NOT_FOUND:
4823 case ERROR_PATH_NOT_FOUND:
4824 default:
4825 errno = ENOENT;
4826 break;
4827 }
4828 return 0;
4829 }
4830 if ((attrs & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
4831 return 0;
4832 logon_network_drive (filename);
4833 fh = FindFirstFile (filename, &wfd);
4834 if (fh == INVALID_HANDLE_VALUE)
4835 return 0;
4836 FindClose (fh);
4837 return (wfd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0
4838 && (wfd.dwReserved0 & IO_REPARSE_TAG_SYMLINK) == IO_REPARSE_TAG_SYMLINK;
4839}
4840
4841/* If NAME identifies a symbolic link, copy into BUF the file name of
4842 the symlink's target. Copy at most BUF_SIZE bytes, and do NOT
4843 null-terminate the target name, even if it fits. Return the number
4844 of bytes copied, or -1 if NAME is not a symlink or any error was
4845 encountered while resolving it. The file name copied into BUF is
4846 encoded in the current ANSI codepage. */
4847ssize_t
4848readlink (const char *name, char *buf, size_t buf_size)
4849{
4850 const char *path;
4851 TOKEN_PRIVILEGES privs;
4852 int restore_privs = 0;
4853 HANDLE sh;
4854 ssize_t retval;
4855
4856 if (name == NULL)
4857 {
4858 errno = EFAULT;
4859 return -1;
4860 }
4861 if (!*name)
4862 {
4863 errno = ENOENT;
4864 return -1;
4865 }
4866
4867 path = map_w32_filename (name, NULL);
4868
4869 if (strlen (path) > MAX_PATH)
4870 {
4871 errno = ENAMETOOLONG;
4872 return -1;
4873 }
4874
4875 errno = 0;
4876 if (is_windows_9x () == TRUE
4877 || (volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0
4878 || !is_symlink (path))
4879 {
4880 if (!errno)
4881 errno = EINVAL; /* not a symlink */
4882 return -1;
4883 }
4884
4885 /* Done with simple tests, now we're in for some _real_ work. */
4886 if (enable_privilege (SE_BACKUP_NAME, TRUE, &privs))
4887 restore_privs = 1;
4888 /* Implementation note: From here and onward, don't return early,
4889 since that will fail to restore the original set of privileges of
4890 the calling thread. */
4891
4892 retval = -1; /* not too optimistic, are we? */
4893
4894 /* Note: In the next call to CreateFile, we use zero as the 2nd
4895 argument because, when the symlink is a hidden/system file,
4896 e.g. 'C:\Users\All Users', GENERIC_READ fails with
4897 ERROR_ACCESS_DENIED. Zero seems to work just fine, both for file
4898 and directory symlinks. */
4899 sh = CreateFile (path, 0, 0, NULL, OPEN_EXISTING,
4900 FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
4901 NULL);
4902 if (sh != INVALID_HANDLE_VALUE)
4903 {
4904 BYTE reparse_buf[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
4905 REPARSE_DATA_BUFFER *reparse_data = (REPARSE_DATA_BUFFER *)&reparse_buf[0];
4906 DWORD retbytes;
4907
4908 if (!DeviceIoControl (sh, FSCTL_GET_REPARSE_POINT, NULL, 0,
4909 reparse_buf, MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
4910 &retbytes, NULL))
4911 errno = EIO;
4912 else if (reparse_data->ReparseTag != IO_REPARSE_TAG_SYMLINK)
4913 errno = EINVAL;
4914 else
4915 {
4916 /* Copy the link target name, in wide characters, from
4917 reparse_data, then convert it to multibyte encoding in
4918 the current locale's codepage. */
4919 WCHAR *lwname;
4920 BYTE lname[MAX_PATH];
4921 USHORT lname_len;
4922 USHORT lwname_len =
4923 reparse_data->SymbolicLinkReparseBuffer.PrintNameLength;
4924 WCHAR *lwname_src =
4925 reparse_data->SymbolicLinkReparseBuffer.PathBuffer
4926 + reparse_data->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR);
4927 /* This updates file_name_codepage which we need below. */
4928 int dbcs_p = max_filename_mbslen () > 1;
4929
4930 /* According to MSDN, PrintNameLength does not include the
4931 terminating null character. */
4932 lwname = alloca ((lwname_len + 1) * sizeof(WCHAR));
4933 memcpy (lwname, lwname_src, lwname_len);
4934 lwname[lwname_len/sizeof(WCHAR)] = 0; /* null-terminate */
4935
4936 lname_len = WideCharToMultiByte (file_name_codepage, 0, lwname, -1,
4937 lname, MAX_PATH, NULL, NULL);
4938 if (!lname_len)
4939 {
4940 /* WideCharToMultiByte failed. */
4941 DWORD w32err1 = GetLastError ();
4942
4943 switch (w32err1)
4944 {
4945 case ERROR_INSUFFICIENT_BUFFER:
4946 errno = ENAMETOOLONG;
4947 break;
4948 case ERROR_INVALID_PARAMETER:
4949 errno = EFAULT;
4950 break;
4951 case ERROR_NO_UNICODE_TRANSLATION:
4952 errno = ENOENT;
4953 break;
4954 default:
4955 errno = EINVAL;
4956 break;
4957 }
4958 }
4959 else
4960 {
4961 size_t size_to_copy = buf_size;
4962 BYTE *p = lname, *p2;
4963 BYTE *pend = p + lname_len;
4964
4965 /* Normalize like dostounix_filename does, but we don't
4966 want to assume that lname is null-terminated. */
4967 if (dbcs_p)
4968 p2 = CharNextExA (file_name_codepage, p, 0);
4969 else
4970 p2 = p + 1;
4971 if (*p && *p2 == ':' && *p >= 'A' && *p <= 'Z')
4972 {
4973 *p += 'a' - 'A';
4974 p += 2;
4975 }
4976 while (p <= pend)
4977 {
4978 if (*p == '\\')
4979 *p = '/';
4980 if (dbcs_p)
4981 {
4982 p = CharNextExA (file_name_codepage, p, 0);
4983 /* CharNextExA doesn't advance at null character. */
4984 if (!*p)
4985 break;
4986 }
4987 else
4988 ++p;
4989 }
4990 /* Testing for null-terminated LNAME is paranoia:
4991 WideCharToMultiByte should always return a
4992 null-terminated string when its 4th argument is -1
4993 and its 3rd argument is null-terminated (which they
4994 are, see above). */
4995 if (lname[lname_len - 1] == '\0')
4996 lname_len--;
4997 if (lname_len <= buf_size)
4998 size_to_copy = lname_len;
4999 strncpy (buf, lname, size_to_copy);
5000 /* Success! */
5001 retval = size_to_copy;
5002 }
5003 }
5004 CloseHandle (sh);
5005 }
5006 else
5007 {
5008 /* CreateFile failed. */
5009 DWORD w32err2 = GetLastError ();
5010
5011 switch (w32err2)
5012 {
5013 case ERROR_FILE_NOT_FOUND:
5014 case ERROR_PATH_NOT_FOUND:
5015 errno = ENOENT;
5016 break;
5017 case ERROR_ACCESS_DENIED:
5018 case ERROR_TOO_MANY_OPEN_FILES:
5019 errno = EACCES;
5020 break;
5021 default:
5022 errno = EPERM;
5023 break;
5024 }
5025 }
5026 if (restore_privs)
5027 {
5028 restore_privilege (&privs);
5029 revert_to_self ();
5030 }
5031
5032 return retval;
5033}
5034
5035ssize_t
5036readlinkat (int fd, char const *name, char *buffer,
5037 size_t buffer_size)
5038{
5039 /* Rely on a hack: an open directory is modeled as file descriptor 0,
5040 as in fstatat. FIXME: Add proper support for readlinkat. */
5041 char fullname[MAX_PATH];
5042
5043 if (fd != AT_FDCWD)
5044 {
5045 if (_snprintf (fullname, sizeof fullname, "%s/%s", dir_pathname, name)
5046 < 0)
5047 {
5048 errno = ENAMETOOLONG;
5049 return -1;
5050 }
5051 name = fullname;
5052 }
5053
5054 return readlink (name, buffer, buffer_size);
5055}
5056
5057/* If FILE is a symlink, return its target (stored in a static
5058 buffer); otherwise return FILE.
5059
5060 This function repeatedly resolves symlinks in the last component of
5061 a chain of symlink file names, as in foo -> bar -> baz -> ...,
5062 until it arrives at a file whose last component is not a symlink,
5063 or some error occurs. It returns the target of the last
5064 successfully resolved symlink in the chain. If it succeeds to
5065 resolve even a single symlink, the value returned is an absolute
5066 file name with backslashes (result of GetFullPathName). By
5067 contrast, if the original FILE is returned, it is unaltered.
5068
5069 Note: This function can set errno even if it succeeds.
5070
5071 Implementation note: we only resolve the last portion ("basename")
5072 of the argument FILE and of each following file in the chain,
5073 disregarding any possible symlinks in its leading directories.
5074 This is because Windows system calls and library functions
5075 transparently resolve symlinks in leading directories and return
5076 correct information, as long as the basename is not a symlink. */
5077static char *
5078chase_symlinks (const char *file)
5079{
5080 static char target[MAX_PATH];
5081 char link[MAX_PATH];
5082 ssize_t res, link_len;
5083 int loop_count = 0;
5084 int dbcs_p;
5085
5086 if (is_windows_9x () == TRUE || !is_symlink (file))
5087 return (char *)file;
5088
5089 if ((link_len = GetFullPathName (file, MAX_PATH, link, NULL)) == 0)
5090 return (char *)file;
5091
5092 dbcs_p = max_filename_mbslen () > 1;
5093 target[0] = '\0';
5094 do {
5095
5096 /* Remove trailing slashes, as we want to resolve the last
5097 non-trivial part of the link name. */
5098 if (!dbcs_p)
5099 {
5100 while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
5101 link[link_len--] = '\0';
5102 }
5103 else if (link_len > 3)
5104 {
5105 char *n = CharPrevExA (file_name_codepage, link, link + link_len, 0);
5106
5107 while (n >= link + 2 && IS_DIRECTORY_SEP (*n))
5108 {
5109 n[1] = '\0';
5110 n = CharPrevExA (file_name_codepage, link, n, 0);
5111 }
5112 }
5113
5114 res = readlink (link, target, MAX_PATH);
5115 if (res > 0)
5116 {
5117 target[res] = '\0';
5118 if (!(IS_DEVICE_SEP (target[1])
5119 || (IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))))
5120 {
5121 /* Target is relative. Append it to the directory part of
5122 the symlink, then copy the result back to target. */
5123 char *p = link + link_len;
5124
5125 if (!dbcs_p)
5126 {
5127 while (p > link && !IS_ANY_SEP (p[-1]))
5128 p--;
5129 }
5130 else
5131 {
5132 char *p1 = CharPrevExA (file_name_codepage, link, p, 0);
5133
5134 while (p > link && !IS_ANY_SEP (*p1))
5135 {
5136 p = p1;
5137 p1 = CharPrevExA (file_name_codepage, link, p1, 0);
5138 }
5139 }
5140 strcpy (p, target);
5141 strcpy (target, link);
5142 }
5143 /* Resolve any "." and ".." to get a fully-qualified file name
5144 in link[] again. */
5145 link_len = GetFullPathName (target, MAX_PATH, link, NULL);
5146 }
5147 } while (res > 0 && link_len > 0 && ++loop_count <= 100);
5148
5149 if (loop_count > 100)
5150 errno = ELOOP;
5151
5152 if (target[0] == '\0') /* not a single call to readlink succeeded */
5153 return (char *)file;
5154 return target;
5155}
5156
5157\f
5158/* Posix ACL emulation. */
5159
5160int
5161acl_valid (acl_t acl)
5162{
5163 return is_valid_security_descriptor ((PSECURITY_DESCRIPTOR)acl) ? 0 : -1;
5164}
5165
5166char *
5167acl_to_text (acl_t acl, ssize_t *size)
5168{
5169 LPTSTR str_acl;
5170 SECURITY_INFORMATION flags =
5171 OWNER_SECURITY_INFORMATION |
5172 GROUP_SECURITY_INFORMATION |
5173 DACL_SECURITY_INFORMATION;
5174 char *retval = NULL;
5175 ULONG local_size;
5176 int e = errno;
5177
5178 errno = 0;
5179
5180 if (convert_sd_to_sddl ((PSECURITY_DESCRIPTOR)acl, SDDL_REVISION_1, flags, &str_acl, &local_size))
5181 {
5182 errno = e;
5183 /* We don't want to mix heaps, so we duplicate the string in our
5184 heap and free the one allocated by the API. */
5185 retval = xstrdup (str_acl);
5186 if (size)
5187 *size = local_size;
5188 LocalFree (str_acl);
5189 }
5190 else if (errno != ENOTSUP)
5191 errno = EINVAL;
5192
5193 return retval;
5194}
5195
5196acl_t
5197acl_from_text (const char *acl_str)
5198{
5199 PSECURITY_DESCRIPTOR psd, retval = NULL;
5200 ULONG sd_size;
5201 int e = errno;
5202
5203 errno = 0;
5204
5205 if (convert_sddl_to_sd (acl_str, SDDL_REVISION_1, &psd, &sd_size))
5206 {
5207 errno = e;
5208 retval = xmalloc (sd_size);
5209 memcpy (retval, psd, sd_size);
5210 LocalFree (psd);
5211 }
5212 else if (errno != ENOTSUP)
5213 errno = EINVAL;
5214
5215 return retval;
5216}
5217
5218int
5219acl_free (void *ptr)
5220{
5221 xfree (ptr);
5222 return 0;
5223}
5224
5225acl_t
5226acl_get_file (const char *fname, acl_type_t type)
5227{
5228 PSECURITY_DESCRIPTOR psd = NULL;
5229 const char *filename;
5230
5231 if (type == ACL_TYPE_ACCESS)
5232 {
5233 DWORD sd_len, err;
5234 SECURITY_INFORMATION si =
5235 OWNER_SECURITY_INFORMATION |
5236 GROUP_SECURITY_INFORMATION |
5237 DACL_SECURITY_INFORMATION ;
5238 int e = errno;
5239
5240 filename = map_w32_filename (fname, NULL);
5241 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
5242 fname = chase_symlinks (filename);
5243 else
5244 fname = filename;
5245
5246 errno = 0;
5247 if (!get_file_security (fname, si, psd, 0, &sd_len)
5248 && errno != ENOTSUP)
5249 {
5250 err = GetLastError ();
5251 if (err == ERROR_INSUFFICIENT_BUFFER)
5252 {
5253 psd = xmalloc (sd_len);
5254 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
5255 {
5256 xfree (psd);
5257 errno = EIO;
5258 psd = NULL;
5259 }
5260 }
5261 else if (err == ERROR_FILE_NOT_FOUND
5262 || err == ERROR_PATH_NOT_FOUND)
5263 errno = ENOENT;
5264 else
5265 errno = EIO;
5266 }
5267 else if (!errno)
5268 errno = e;
5269 }
5270 else if (type != ACL_TYPE_DEFAULT)
5271 errno = EINVAL;
5272
5273 return psd;
5274}
5275
5276int
5277acl_set_file (const char *fname, acl_type_t type, acl_t acl)
5278{
5279 TOKEN_PRIVILEGES old1, old2;
5280 DWORD err;
5281 int st = 0, retval = -1;
5282 SECURITY_INFORMATION flags = 0;
5283 PSID psid;
5284 PACL pacl;
5285 BOOL dflt;
5286 BOOL dacl_present;
5287 int e;
5288 const char *filename;
5289
5290 if (acl_valid (acl) != 0
5291 || (type != ACL_TYPE_DEFAULT && type != ACL_TYPE_ACCESS))
5292 {
5293 errno = EINVAL;
5294 return -1;
5295 }
5296
5297 if (type == ACL_TYPE_DEFAULT)
5298 {
5299 errno = ENOSYS;
5300 return -1;
5301 }
5302
5303 filename = map_w32_filename (fname, NULL);
5304 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
5305 fname = chase_symlinks (filename);
5306 else
5307 fname = filename;
5308
5309 if (get_security_descriptor_owner ((PSECURITY_DESCRIPTOR)acl, &psid, &dflt)
5310 && psid)
5311 flags |= OWNER_SECURITY_INFORMATION;
5312 if (get_security_descriptor_group ((PSECURITY_DESCRIPTOR)acl, &psid, &dflt)
5313 && psid)
5314 flags |= GROUP_SECURITY_INFORMATION;
5315 if (get_security_descriptor_dacl ((PSECURITY_DESCRIPTOR)acl, &dacl_present,
5316 &pacl, &dflt)
5317 && dacl_present)
5318 flags |= DACL_SECURITY_INFORMATION;
5319 if (!flags)
5320 return 0;
5321
5322 /* According to KB-245153, setting the owner will succeed if either:
5323 (1) the caller is the user who will be the new owner, and has the
5324 SE_TAKE_OWNERSHIP privilege, or
5325 (2) the caller has the SE_RESTORE privilege, in which case she can
5326 set any valid user or group as the owner
5327
5328 We request below both SE_TAKE_OWNERSHIP and SE_RESTORE
5329 privileges, and disregard any failures in obtaining them. If
5330 these privileges cannot be obtained, and do not already exist in
5331 the calling thread's security token, this function could fail
5332 with EPERM. */
5333 if (enable_privilege (SE_TAKE_OWNERSHIP_NAME, TRUE, &old1))
5334 st++;
5335 if (enable_privilege (SE_RESTORE_NAME, TRUE, &old2))
5336 st++;
5337
5338 e = errno;
5339 errno = 0;
5340 if (!set_file_security ((char *)fname, flags, (PSECURITY_DESCRIPTOR)acl))
5341 {
5342 err = GetLastError ();
5343
5344 if (errno == ENOTSUP)
5345 ;
5346 else if (err == ERROR_INVALID_OWNER
5347 || err == ERROR_NOT_ALL_ASSIGNED
5348 || err == ERROR_ACCESS_DENIED)
5349 {
5350 /* Maybe the requested ACL and the one the file already has
5351 are identical, in which case we can silently ignore the
5352 failure. (And no, Windows doesn't.) */
5353 acl_t current_acl = acl_get_file (fname, ACL_TYPE_ACCESS);
5354
5355 errno = EPERM;
5356 if (current_acl)
5357 {
5358 char *acl_from = acl_to_text (current_acl, NULL);
5359 char *acl_to = acl_to_text (acl, NULL);
5360
5361 if (acl_from && acl_to && xstrcasecmp (acl_from, acl_to) == 0)
5362 {
5363 retval = 0;
5364 errno = e;
5365 }
5366 if (acl_from)
5367 acl_free (acl_from);
5368 if (acl_to)
5369 acl_free (acl_to);
5370 acl_free (current_acl);
5371 }
5372 }
5373 else if (err == ERROR_FILE_NOT_FOUND || err == ERROR_PATH_NOT_FOUND)
5374 errno = ENOENT;
5375 else
5376 errno = EACCES;
5377 }
5378 else
5379 {
5380 retval = 0;
5381 errno = e;
5382 }
5383
5384 if (st)
5385 {
5386 if (st >= 2)
5387 restore_privilege (&old2);
5388 restore_privilege (&old1);
5389 revert_to_self ();
5390 }
5391
5392 return retval;
5393}
5394
5395\f
5396/* MS-Windows version of careadlinkat (cf. ../lib/careadlinkat.c). We
5397 have a fixed max size for file names, so we don't need the kind of
5398 alloc/malloc/realloc dance the gnulib version does. We also don't
5399 support FD-relative symlinks. */
5400char *
5401careadlinkat (int fd, char const *filename,
5402 char *buffer, size_t buffer_size,
5403 struct allocator const *alloc,
5404 ssize_t (*preadlinkat) (int, char const *, char *, size_t))
5405{
5406 char linkname[MAX_PATH];
5407 ssize_t link_size;
5408
5409 link_size = preadlinkat (fd, filename, linkname, sizeof(linkname));
5410
5411 if (link_size > 0)
5412 {
5413 char *retval = buffer;
5414
5415 linkname[link_size++] = '\0';
5416 if (link_size > buffer_size)
5417 retval = (char *)(alloc ? alloc->allocate : xmalloc) (link_size);
5418 if (retval)
5419 memcpy (retval, linkname, link_size);
5420
5421 return retval;
5422 }
5423 return NULL;
5424}
5425
5426\f
5427/* Support for browsing other processes and their attributes. See
5428 process.c for the Lisp bindings. */
5429
5430/* Helper wrapper functions. */
5431
5432static HANDLE WINAPI
5433create_toolhelp32_snapshot (DWORD Flags, DWORD Ignored)
5434{
5435 static CreateToolhelp32Snapshot_Proc s_pfn_Create_Toolhelp32_Snapshot = NULL;
5436
5437 if (g_b_init_create_toolhelp32_snapshot == 0)
5438 {
5439 g_b_init_create_toolhelp32_snapshot = 1;
5440 s_pfn_Create_Toolhelp32_Snapshot = (CreateToolhelp32Snapshot_Proc)
5441 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5442 "CreateToolhelp32Snapshot");
5443 }
5444 if (s_pfn_Create_Toolhelp32_Snapshot == NULL)
5445 {
5446 return INVALID_HANDLE_VALUE;
5447 }
5448 return (s_pfn_Create_Toolhelp32_Snapshot (Flags, Ignored));
5449}
5450
5451static BOOL WINAPI
5452process32_first (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
5453{
5454 static Process32First_Proc s_pfn_Process32_First = NULL;
5455
5456 if (g_b_init_process32_first == 0)
5457 {
5458 g_b_init_process32_first = 1;
5459 s_pfn_Process32_First = (Process32First_Proc)
5460 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5461 "Process32First");
5462 }
5463 if (s_pfn_Process32_First == NULL)
5464 {
5465 return FALSE;
5466 }
5467 return (s_pfn_Process32_First (hSnapshot, lppe));
5468}
5469
5470static BOOL WINAPI
5471process32_next (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
5472{
5473 static Process32Next_Proc s_pfn_Process32_Next = NULL;
5474
5475 if (g_b_init_process32_next == 0)
5476 {
5477 g_b_init_process32_next = 1;
5478 s_pfn_Process32_Next = (Process32Next_Proc)
5479 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5480 "Process32Next");
5481 }
5482 if (s_pfn_Process32_Next == NULL)
5483 {
5484 return FALSE;
5485 }
5486 return (s_pfn_Process32_Next (hSnapshot, lppe));
5487}
5488
5489static BOOL WINAPI
5490open_thread_token (HANDLE ThreadHandle,
5491 DWORD DesiredAccess,
5492 BOOL OpenAsSelf,
5493 PHANDLE TokenHandle)
5494{
5495 static OpenThreadToken_Proc s_pfn_Open_Thread_Token = NULL;
5496 HMODULE hm_advapi32 = NULL;
5497 if (is_windows_9x () == TRUE)
5498 {
5499 SetLastError (ERROR_NOT_SUPPORTED);
5500 return FALSE;
5501 }
5502 if (g_b_init_open_thread_token == 0)
5503 {
5504 g_b_init_open_thread_token = 1;
5505 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5506 s_pfn_Open_Thread_Token =
5507 (OpenThreadToken_Proc) GetProcAddress (hm_advapi32, "OpenThreadToken");
5508 }
5509 if (s_pfn_Open_Thread_Token == NULL)
5510 {
5511 SetLastError (ERROR_NOT_SUPPORTED);
5512 return FALSE;
5513 }
5514 return (
5515 s_pfn_Open_Thread_Token (
5516 ThreadHandle,
5517 DesiredAccess,
5518 OpenAsSelf,
5519 TokenHandle)
5520 );
5521}
5522
5523static BOOL WINAPI
5524impersonate_self (SECURITY_IMPERSONATION_LEVEL ImpersonationLevel)
5525{
5526 static ImpersonateSelf_Proc s_pfn_Impersonate_Self = NULL;
5527 HMODULE hm_advapi32 = NULL;
5528 if (is_windows_9x () == TRUE)
5529 {
5530 return FALSE;
5531 }
5532 if (g_b_init_impersonate_self == 0)
5533 {
5534 g_b_init_impersonate_self = 1;
5535 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5536 s_pfn_Impersonate_Self =
5537 (ImpersonateSelf_Proc) GetProcAddress (hm_advapi32, "ImpersonateSelf");
5538 }
5539 if (s_pfn_Impersonate_Self == NULL)
5540 {
5541 return FALSE;
5542 }
5543 return s_pfn_Impersonate_Self (ImpersonationLevel);
5544}
5545
5546static BOOL WINAPI
5547revert_to_self (void)
5548{
5549 static RevertToSelf_Proc s_pfn_Revert_To_Self = NULL;
5550 HMODULE hm_advapi32 = NULL;
5551 if (is_windows_9x () == TRUE)
5552 {
5553 return FALSE;
5554 }
5555 if (g_b_init_revert_to_self == 0)
5556 {
5557 g_b_init_revert_to_self = 1;
5558 hm_advapi32 = LoadLibrary ("Advapi32.dll");
5559 s_pfn_Revert_To_Self =
5560 (RevertToSelf_Proc) GetProcAddress (hm_advapi32, "RevertToSelf");
5561 }
5562 if (s_pfn_Revert_To_Self == NULL)
5563 {
5564 return FALSE;
5565 }
5566 return s_pfn_Revert_To_Self ();
5567}
5568
5569static BOOL WINAPI
5570get_process_memory_info (HANDLE h_proc,
5571 PPROCESS_MEMORY_COUNTERS mem_counters,
5572 DWORD bufsize)
5573{
5574 static GetProcessMemoryInfo_Proc s_pfn_Get_Process_Memory_Info = NULL;
5575 HMODULE hm_psapi = NULL;
5576 if (is_windows_9x () == TRUE)
5577 {
5578 return FALSE;
5579 }
5580 if (g_b_init_get_process_memory_info == 0)
5581 {
5582 g_b_init_get_process_memory_info = 1;
5583 hm_psapi = LoadLibrary ("Psapi.dll");
5584 if (hm_psapi)
5585 s_pfn_Get_Process_Memory_Info = (GetProcessMemoryInfo_Proc)
5586 GetProcAddress (hm_psapi, "GetProcessMemoryInfo");
5587 }
5588 if (s_pfn_Get_Process_Memory_Info == NULL)
5589 {
5590 return FALSE;
5591 }
5592 return s_pfn_Get_Process_Memory_Info (h_proc, mem_counters, bufsize);
5593}
5594
5595static BOOL WINAPI
5596get_process_working_set_size (HANDLE h_proc,
5597 PSIZE_T minrss,
5598 PSIZE_T maxrss)
5599{
5600 static GetProcessWorkingSetSize_Proc
5601 s_pfn_Get_Process_Working_Set_Size = NULL;
5602
5603 if (is_windows_9x () == TRUE)
5604 {
5605 return FALSE;
5606 }
5607 if (g_b_init_get_process_working_set_size == 0)
5608 {
5609 g_b_init_get_process_working_set_size = 1;
5610 s_pfn_Get_Process_Working_Set_Size = (GetProcessWorkingSetSize_Proc)
5611 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5612 "GetProcessWorkingSetSize");
5613 }
5614 if (s_pfn_Get_Process_Working_Set_Size == NULL)
5615 {
5616 return FALSE;
5617 }
5618 return s_pfn_Get_Process_Working_Set_Size (h_proc, minrss, maxrss);
5619}
5620
5621static BOOL WINAPI
5622global_memory_status (MEMORYSTATUS *buf)
5623{
5624 static GlobalMemoryStatus_Proc s_pfn_Global_Memory_Status = NULL;
5625
5626 if (is_windows_9x () == TRUE)
5627 {
5628 return FALSE;
5629 }
5630 if (g_b_init_global_memory_status == 0)
5631 {
5632 g_b_init_global_memory_status = 1;
5633 s_pfn_Global_Memory_Status = (GlobalMemoryStatus_Proc)
5634 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5635 "GlobalMemoryStatus");
5636 }
5637 if (s_pfn_Global_Memory_Status == NULL)
5638 {
5639 return FALSE;
5640 }
5641 return s_pfn_Global_Memory_Status (buf);
5642}
5643
5644static BOOL WINAPI
5645global_memory_status_ex (MEMORY_STATUS_EX *buf)
5646{
5647 static GlobalMemoryStatusEx_Proc s_pfn_Global_Memory_Status_Ex = NULL;
5648
5649 if (is_windows_9x () == TRUE)
5650 {
5651 return FALSE;
5652 }
5653 if (g_b_init_global_memory_status_ex == 0)
5654 {
5655 g_b_init_global_memory_status_ex = 1;
5656 s_pfn_Global_Memory_Status_Ex = (GlobalMemoryStatusEx_Proc)
5657 GetProcAddress (GetModuleHandle ("kernel32.dll"),
5658 "GlobalMemoryStatusEx");
5659 }
5660 if (s_pfn_Global_Memory_Status_Ex == NULL)
5661 {
5662 return FALSE;
5663 }
5664 return s_pfn_Global_Memory_Status_Ex (buf);
5665}
5666
5667Lisp_Object
5668list_system_processes (void)
5669{
5670 struct gcpro gcpro1;
5671 Lisp_Object proclist = Qnil;
5672 HANDLE h_snapshot;
5673
5674 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
5675
5676 if (h_snapshot != INVALID_HANDLE_VALUE)
5677 {
5678 PROCESSENTRY32 proc_entry;
5679 DWORD proc_id;
5680 BOOL res;
5681
5682 GCPRO1 (proclist);
5683
5684 proc_entry.dwSize = sizeof (PROCESSENTRY32);
5685 for (res = process32_first (h_snapshot, &proc_entry); res;
5686 res = process32_next (h_snapshot, &proc_entry))
5687 {
5688 proc_id = proc_entry.th32ProcessID;
5689 proclist = Fcons (make_fixnum_or_float (proc_id), proclist);
5690 }
5691
5692 CloseHandle (h_snapshot);
5693 UNGCPRO;
5694 proclist = Fnreverse (proclist);
5695 }
5696
5697 return proclist;
5698}
5699
5700static int
5701enable_privilege (LPCTSTR priv_name, BOOL enable_p, TOKEN_PRIVILEGES *old_priv)
5702{
5703 TOKEN_PRIVILEGES priv;
5704 DWORD priv_size = sizeof (priv);
5705 DWORD opriv_size = sizeof (*old_priv);
5706 HANDLE h_token = NULL;
5707 HANDLE h_thread = GetCurrentThread ();
5708 int ret_val = 0;
5709 BOOL res;
5710
5711 res = open_thread_token (h_thread,
5712 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5713 FALSE, &h_token);
5714 if (!res && GetLastError () == ERROR_NO_TOKEN)
5715 {
5716 if (impersonate_self (SecurityImpersonation))
5717 res = open_thread_token (h_thread,
5718 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5719 FALSE, &h_token);
5720 }
5721 if (res)
5722 {
5723 priv.PrivilegeCount = 1;
5724 priv.Privileges[0].Attributes = enable_p ? SE_PRIVILEGE_ENABLED : 0;
5725 LookupPrivilegeValue (NULL, priv_name, &priv.Privileges[0].Luid);
5726 if (AdjustTokenPrivileges (h_token, FALSE, &priv, priv_size,
5727 old_priv, &opriv_size)
5728 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
5729 ret_val = 1;
5730 }
5731 if (h_token)
5732 CloseHandle (h_token);
5733
5734 return ret_val;
5735}
5736
5737static int
5738restore_privilege (TOKEN_PRIVILEGES *priv)
5739{
5740 DWORD priv_size = sizeof (*priv);
5741 HANDLE h_token = NULL;
5742 int ret_val = 0;
5743
5744 if (open_thread_token (GetCurrentThread (),
5745 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
5746 FALSE, &h_token))
5747 {
5748 if (AdjustTokenPrivileges (h_token, FALSE, priv, priv_size, NULL, NULL)
5749 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
5750 ret_val = 1;
5751 }
5752 if (h_token)
5753 CloseHandle (h_token);
5754
5755 return ret_val;
5756}
5757
5758static Lisp_Object
5759ltime (ULONGLONG time_100ns)
5760{
5761 ULONGLONG time_sec = time_100ns / 10000000;
5762 int subsec = time_100ns % 10000000;
5763 return list4i (time_sec >> 16, time_sec & 0xffff,
5764 subsec / 10, subsec % 10 * 100000);
5765}
5766
5767#define U64_TO_LISP_TIME(time) ltime (time)
5768
5769static int
5770process_times (HANDLE h_proc, Lisp_Object *ctime, Lisp_Object *etime,
5771 Lisp_Object *stime, Lisp_Object *utime, Lisp_Object *ttime,
5772 double *pcpu)
5773{
5774 FILETIME ft_creation, ft_exit, ft_kernel, ft_user, ft_current;
5775 ULONGLONG tem1, tem2, tem3, tem;
5776
5777 if (!h_proc
5778 || !get_process_times_fn
5779 || !(*get_process_times_fn) (h_proc, &ft_creation, &ft_exit,
5780 &ft_kernel, &ft_user))
5781 return 0;
5782
5783 GetSystemTimeAsFileTime (&ft_current);
5784
5785 FILETIME_TO_U64 (tem1, ft_kernel);
5786 *stime = U64_TO_LISP_TIME (tem1);
5787
5788 FILETIME_TO_U64 (tem2, ft_user);
5789 *utime = U64_TO_LISP_TIME (tem2);
5790
5791 tem3 = tem1 + tem2;
5792 *ttime = U64_TO_LISP_TIME (tem3);
5793
5794 FILETIME_TO_U64 (tem, ft_creation);
5795 /* Process no 4 (System) returns zero creation time. */
5796 if (tem)
5797 tem -= utc_base;
5798 *ctime = U64_TO_LISP_TIME (tem);
5799
5800 if (tem)
5801 {
5802 FILETIME_TO_U64 (tem3, ft_current);
5803 tem = (tem3 - utc_base) - tem;
5804 }
5805 *etime = U64_TO_LISP_TIME (tem);
5806
5807 if (tem)
5808 {
5809 *pcpu = 100.0 * (tem1 + tem2) / tem;
5810 if (*pcpu > 100)
5811 *pcpu = 100.0;
5812 }
5813 else
5814 *pcpu = 0;
5815
5816 return 1;
5817}
5818
5819Lisp_Object
5820system_process_attributes (Lisp_Object pid)
5821{
5822 struct gcpro gcpro1, gcpro2, gcpro3;
5823 Lisp_Object attrs = Qnil;
5824 Lisp_Object cmd_str, decoded_cmd, tem;
5825 HANDLE h_snapshot, h_proc;
5826 DWORD proc_id;
5827 int found_proc = 0;
5828 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
5829 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
5830 DWORD glength = sizeof (gname);
5831 HANDLE token = NULL;
5832 SID_NAME_USE user_type;
5833 unsigned char *buf = NULL;
5834 DWORD blen = 0;
5835 TOKEN_USER user_token;
5836 TOKEN_PRIMARY_GROUP group_token;
5837 unsigned euid;
5838 unsigned egid;
5839 PROCESS_MEMORY_COUNTERS mem;
5840 PROCESS_MEMORY_COUNTERS_EX mem_ex;
5841 SIZE_T minrss, maxrss;
5842 MEMORYSTATUS memst;
5843 MEMORY_STATUS_EX memstex;
5844 double totphys = 0.0;
5845 Lisp_Object ctime, stime, utime, etime, ttime;
5846 double pcpu;
5847 BOOL result = FALSE;
5848
5849 CHECK_NUMBER_OR_FLOAT (pid);
5850 proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
5851
5852 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
5853
5854 GCPRO3 (attrs, decoded_cmd, tem);
5855
5856 if (h_snapshot != INVALID_HANDLE_VALUE)
5857 {
5858 PROCESSENTRY32 pe;
5859 BOOL res;
5860
5861 pe.dwSize = sizeof (PROCESSENTRY32);
5862 for (res = process32_first (h_snapshot, &pe); res;
5863 res = process32_next (h_snapshot, &pe))
5864 {
5865 if (proc_id == pe.th32ProcessID)
5866 {
5867 if (proc_id == 0)
5868 decoded_cmd = build_string ("Idle");
5869 else
5870 {
5871 /* Decode the command name from locale-specific
5872 encoding. */
5873 cmd_str = build_unibyte_string (pe.szExeFile);
5874
5875 decoded_cmd =
5876 code_convert_string_norecord (cmd_str,
5877 Vlocale_coding_system, 0);
5878 }
5879 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
5880 attrs = Fcons (Fcons (Qppid,
5881 make_fixnum_or_float (pe.th32ParentProcessID)),
5882 attrs);
5883 attrs = Fcons (Fcons (Qpri, make_number (pe.pcPriClassBase)),
5884 attrs);
5885 attrs = Fcons (Fcons (Qthcount,
5886 make_fixnum_or_float (pe.cntThreads)),
5887 attrs);
5888 found_proc = 1;
5889 break;
5890 }
5891 }
5892
5893 CloseHandle (h_snapshot);
5894 }
5895
5896 if (!found_proc)
5897 {
5898 UNGCPRO;
5899 return Qnil;
5900 }
5901
5902 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
5903 FALSE, proc_id);
5904 /* If we were denied a handle to the process, try again after
5905 enabling the SeDebugPrivilege in our process. */
5906 if (!h_proc)
5907 {
5908 TOKEN_PRIVILEGES priv_current;
5909
5910 if (enable_privilege (SE_DEBUG_NAME, TRUE, &priv_current))
5911 {
5912 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
5913 FALSE, proc_id);
5914 restore_privilege (&priv_current);
5915 revert_to_self ();
5916 }
5917 }
5918 if (h_proc)
5919 {
5920 result = open_process_token (h_proc, TOKEN_QUERY, &token);
5921 if (result)
5922 {
5923 result = get_token_information (token, TokenUser, NULL, 0, &blen);
5924 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
5925 {
5926 buf = xmalloc (blen);
5927 result = get_token_information (token, TokenUser,
5928 (LPVOID)buf, blen, &needed);
5929 if (result)
5930 {
5931 memcpy (&user_token, buf, sizeof (user_token));
5932 if (!w32_cached_id (user_token.User.Sid, &euid, uname))
5933 {
5934 euid = get_rid (user_token.User.Sid);
5935 result = lookup_account_sid (NULL, user_token.User.Sid,
5936 uname, &ulength,
5937 domain, &dlength,
5938 &user_type);
5939 if (result)
5940 w32_add_to_cache (user_token.User.Sid, euid, uname);
5941 else
5942 {
5943 strcpy (uname, "unknown");
5944 result = TRUE;
5945 }
5946 }
5947 ulength = strlen (uname);
5948 }
5949 }
5950 }
5951 if (result)
5952 {
5953 /* Determine a reasonable euid and gid values. */
5954 if (xstrcasecmp ("administrator", uname) == 0)
5955 {
5956 euid = 500; /* well-known Administrator uid */
5957 egid = 513; /* well-known None gid */
5958 }
5959 else
5960 {
5961 /* Get group id and name. */
5962 result = get_token_information (token, TokenPrimaryGroup,
5963 (LPVOID)buf, blen, &needed);
5964 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
5965 {
5966 buf = xrealloc (buf, blen = needed);
5967 result = get_token_information (token, TokenPrimaryGroup,
5968 (LPVOID)buf, blen, &needed);
5969 }
5970 if (result)
5971 {
5972 memcpy (&group_token, buf, sizeof (group_token));
5973 if (!w32_cached_id (group_token.PrimaryGroup, &egid, gname))
5974 {
5975 egid = get_rid (group_token.PrimaryGroup);
5976 dlength = sizeof (domain);
5977 result =
5978 lookup_account_sid (NULL, group_token.PrimaryGroup,
5979 gname, &glength, NULL, &dlength,
5980 &user_type);
5981 if (result)
5982 w32_add_to_cache (group_token.PrimaryGroup,
5983 egid, gname);
5984 else
5985 {
5986 strcpy (gname, "None");
5987 result = TRUE;
5988 }
5989 }
5990 glength = strlen (gname);
5991 }
5992 }
5993 }
5994 xfree (buf);
5995 }
5996 if (!result)
5997 {
5998 if (!is_windows_9x ())
5999 {
6000 /* We couldn't open the process token, presumably because of
6001 insufficient access rights. Assume this process is run
6002 by the system. */
6003 strcpy (uname, "SYSTEM");
6004 strcpy (gname, "None");
6005 euid = 18; /* SYSTEM */
6006 egid = 513; /* None */
6007 glength = strlen (gname);
6008 ulength = strlen (uname);
6009 }
6010 /* If we are running under Windows 9X, where security calls are
6011 not supported, we assume all processes are run by the current
6012 user. */
6013 else if (GetUserName (uname, &ulength))
6014 {
6015 if (xstrcasecmp ("administrator", uname) == 0)
6016 euid = 0;
6017 else
6018 euid = 123;
6019 egid = euid;
6020 strcpy (gname, "None");
6021 glength = strlen (gname);
6022 ulength = strlen (uname);
6023 }
6024 else
6025 {
6026 euid = 123;
6027 egid = 123;
6028 strcpy (uname, "administrator");
6029 ulength = strlen (uname);
6030 strcpy (gname, "None");
6031 glength = strlen (gname);
6032 }
6033 if (token)
6034 CloseHandle (token);
6035 }
6036
6037 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (euid)), attrs);
6038 tem = make_unibyte_string (uname, ulength);
6039 attrs = Fcons (Fcons (Quser,
6040 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
6041 attrs);
6042 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (egid)), attrs);
6043 tem = make_unibyte_string (gname, glength);
6044 attrs = Fcons (Fcons (Qgroup,
6045 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
6046 attrs);
6047
6048 if (global_memory_status_ex (&memstex))
6049#if __GNUC__ || (defined (_MSC_VER) && _MSC_VER >= 1300)
6050 totphys = memstex.ullTotalPhys / 1024.0;
6051#else
6052 /* Visual Studio 6 cannot convert an unsigned __int64 type to
6053 double, so we need to do this for it... */
6054 {
6055 DWORD tot_hi = memstex.ullTotalPhys >> 32;
6056 DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffff) >> 10;
6057 DWORD tot_lo = memstex.ullTotalPhys % 1024;
6058
6059 totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
6060 }
6061#endif /* __GNUC__ || _MSC_VER >= 1300 */
6062 else if (global_memory_status (&memst))
6063 totphys = memst.dwTotalPhys / 1024.0;
6064
6065 if (h_proc
6066 && get_process_memory_info (h_proc, (PROCESS_MEMORY_COUNTERS *)&mem_ex,
6067 sizeof (mem_ex)))
6068 {
6069 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
6070
6071 attrs = Fcons (Fcons (Qmajflt,
6072 make_fixnum_or_float (mem_ex.PageFaultCount)),
6073 attrs);
6074 attrs = Fcons (Fcons (Qvsize,
6075 make_fixnum_or_float (mem_ex.PrivateUsage / 1024)),
6076 attrs);
6077 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
6078 if (totphys)
6079 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6080 }
6081 else if (h_proc
6082 && get_process_memory_info (h_proc, &mem, sizeof (mem)))
6083 {
6084 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
6085
6086 attrs = Fcons (Fcons (Qmajflt,
6087 make_fixnum_or_float (mem.PageFaultCount)),
6088 attrs);
6089 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
6090 if (totphys)
6091 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6092 }
6093 else if (h_proc
6094 && get_process_working_set_size (h_proc, &minrss, &maxrss))
6095 {
6096 DWORD rss = maxrss / 1024;
6097
6098 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (maxrss / 1024)), attrs);
6099 if (totphys)
6100 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
6101 }
6102
6103 if (process_times (h_proc, &ctime, &etime, &stime, &utime, &ttime, &pcpu))
6104 {
6105 attrs = Fcons (Fcons (Qutime, utime), attrs);
6106 attrs = Fcons (Fcons (Qstime, stime), attrs);
6107 attrs = Fcons (Fcons (Qtime, ttime), attrs);
6108 attrs = Fcons (Fcons (Qstart, ctime), attrs);
6109 attrs = Fcons (Fcons (Qetime, etime), attrs);
6110 attrs = Fcons (Fcons (Qpcpu, make_float (pcpu)), attrs);
6111 }
6112
6113 /* FIXME: Retrieve command line by walking the PEB of the process. */
6114
6115 if (h_proc)
6116 CloseHandle (h_proc);
6117 UNGCPRO;
6118 return attrs;
6119}
6120
6121\f
6122/* Wrappers for winsock functions to map between our file descriptors
6123 and winsock's handles; also set h_errno for convenience.
6124
6125 To allow Emacs to run on systems which don't have winsock support
6126 installed, we dynamically link to winsock on startup if present, and
6127 otherwise provide the minimum necessary functionality
6128 (eg. gethostname). */
6129
6130/* function pointers for relevant socket functions */
6131int (PASCAL *pfn_WSAStartup) (WORD wVersionRequired, LPWSADATA lpWSAData);
6132void (PASCAL *pfn_WSASetLastError) (int iError);
6133int (PASCAL *pfn_WSAGetLastError) (void);
6134int (PASCAL *pfn_WSAEventSelect) (SOCKET s, HANDLE hEventObject, long lNetworkEvents);
6135HANDLE (PASCAL *pfn_WSACreateEvent) (void);
6136int (PASCAL *pfn_WSACloseEvent) (HANDLE hEvent);
6137int (PASCAL *pfn_socket) (int af, int type, int protocol);
6138int (PASCAL *pfn_bind) (SOCKET s, const struct sockaddr *addr, int namelen);
6139int (PASCAL *pfn_connect) (SOCKET s, const struct sockaddr *addr, int namelen);
6140int (PASCAL *pfn_ioctlsocket) (SOCKET s, long cmd, u_long *argp);
6141int (PASCAL *pfn_recv) (SOCKET s, char * buf, int len, int flags);
6142int (PASCAL *pfn_send) (SOCKET s, const char * buf, int len, int flags);
6143int (PASCAL *pfn_closesocket) (SOCKET s);
6144int (PASCAL *pfn_shutdown) (SOCKET s, int how);
6145int (PASCAL *pfn_WSACleanup) (void);
6146
6147u_short (PASCAL *pfn_htons) (u_short hostshort);
6148u_short (PASCAL *pfn_ntohs) (u_short netshort);
6149unsigned long (PASCAL *pfn_inet_addr) (const char * cp);
6150int (PASCAL *pfn_gethostname) (char * name, int namelen);
6151struct hostent * (PASCAL *pfn_gethostbyname) (const char * name);
6152struct servent * (PASCAL *pfn_getservbyname) (const char * name, const char * proto);
6153int (PASCAL *pfn_getpeername) (SOCKET s, struct sockaddr *addr, int * namelen);
6154int (PASCAL *pfn_setsockopt) (SOCKET s, int level, int optname,
6155 const char * optval, int optlen);
6156int (PASCAL *pfn_listen) (SOCKET s, int backlog);
6157int (PASCAL *pfn_getsockname) (SOCKET s, struct sockaddr * name,
6158 int * namelen);
6159SOCKET (PASCAL *pfn_accept) (SOCKET s, struct sockaddr * addr, int * addrlen);
6160int (PASCAL *pfn_recvfrom) (SOCKET s, char * buf, int len, int flags,
6161 struct sockaddr * from, int * fromlen);
6162int (PASCAL *pfn_sendto) (SOCKET s, const char * buf, int len, int flags,
6163 const struct sockaddr * to, int tolen);
6164
6165/* SetHandleInformation is only needed to make sockets non-inheritable. */
6166BOOL (WINAPI *pfn_SetHandleInformation) (HANDLE object, DWORD mask, DWORD flags);
6167#ifndef HANDLE_FLAG_INHERIT
6168#define HANDLE_FLAG_INHERIT 1
6169#endif
6170
6171HANDLE winsock_lib;
6172static int winsock_inuse;
6173
6174BOOL
6175term_winsock (void)
6176{
6177 if (winsock_lib != NULL && winsock_inuse == 0)
6178 {
6179 release_listen_threads ();
6180 /* Not sure what would cause WSAENETDOWN, or even if it can happen
6181 after WSAStartup returns successfully, but it seems reasonable
6182 to allow unloading winsock anyway in that case. */
6183 if (pfn_WSACleanup () == 0 ||
6184 pfn_WSAGetLastError () == WSAENETDOWN)
6185 {
6186 if (FreeLibrary (winsock_lib))
6187 winsock_lib = NULL;
6188 return TRUE;
6189 }
6190 }
6191 return FALSE;
6192}
6193
6194BOOL
6195init_winsock (int load_now)
6196{
6197 WSADATA winsockData;
6198
6199 if (winsock_lib != NULL)
6200 return TRUE;
6201
6202 pfn_SetHandleInformation
6203 = (void *) GetProcAddress (GetModuleHandle ("kernel32.dll"),
6204 "SetHandleInformation");
6205
6206 winsock_lib = LoadLibrary ("Ws2_32.dll");
6207
6208 if (winsock_lib != NULL)
6209 {
6210 /* dynamically link to socket functions */
6211
6212#define LOAD_PROC(fn) \
6213 if ((pfn_##fn = (void *) GetProcAddress (winsock_lib, #fn)) == NULL) \
6214 goto fail;
6215
6216 LOAD_PROC (WSAStartup);
6217 LOAD_PROC (WSASetLastError);
6218 LOAD_PROC (WSAGetLastError);
6219 LOAD_PROC (WSAEventSelect);
6220 LOAD_PROC (WSACreateEvent);
6221 LOAD_PROC (WSACloseEvent);
6222 LOAD_PROC (socket);
6223 LOAD_PROC (bind);
6224 LOAD_PROC (connect);
6225 LOAD_PROC (ioctlsocket);
6226 LOAD_PROC (recv);
6227 LOAD_PROC (send);
6228 LOAD_PROC (closesocket);
6229 LOAD_PROC (shutdown);
6230 LOAD_PROC (htons);
6231 LOAD_PROC (ntohs);
6232 LOAD_PROC (inet_addr);
6233 LOAD_PROC (gethostname);
6234 LOAD_PROC (gethostbyname);
6235 LOAD_PROC (getservbyname);
6236 LOAD_PROC (getpeername);
6237 LOAD_PROC (WSACleanup);
6238 LOAD_PROC (setsockopt);
6239 LOAD_PROC (listen);
6240 LOAD_PROC (getsockname);
6241 LOAD_PROC (accept);
6242 LOAD_PROC (recvfrom);
6243 LOAD_PROC (sendto);
6244#undef LOAD_PROC
6245
6246 /* specify version 1.1 of winsock */
6247 if (pfn_WSAStartup (0x101, &winsockData) == 0)
6248 {
6249 if (winsockData.wVersion != 0x101)
6250 goto fail;
6251
6252 if (!load_now)
6253 {
6254 /* Report that winsock exists and is usable, but leave
6255 socket functions disabled. I am assuming that calling
6256 WSAStartup does not require any network interaction,
6257 and in particular does not cause or require a dial-up
6258 connection to be established. */
6259
6260 pfn_WSACleanup ();
6261 FreeLibrary (winsock_lib);
6262 winsock_lib = NULL;
6263 }
6264 winsock_inuse = 0;
6265 return TRUE;
6266 }
6267
6268 fail:
6269 FreeLibrary (winsock_lib);
6270 winsock_lib = NULL;
6271 }
6272
6273 return FALSE;
6274}
6275
6276
6277int h_errno = 0;
6278
6279/* Function to map winsock error codes to errno codes for those errno
6280 code defined in errno.h (errno values not defined by errno.h are
6281 already in nt/inc/sys/socket.h). */
6282static void
6283set_errno (void)
6284{
6285 int wsa_err;
6286
6287 h_errno = 0;
6288 if (winsock_lib == NULL)
6289 wsa_err = EINVAL;
6290 else
6291 wsa_err = pfn_WSAGetLastError ();
6292
6293 switch (wsa_err)
6294 {
6295 case WSAEACCES: errno = EACCES; break;
6296 case WSAEBADF: errno = EBADF; break;
6297 case WSAEFAULT: errno = EFAULT; break;
6298 case WSAEINTR: errno = EINTR; break;
6299 case WSAEINVAL: errno = EINVAL; break;
6300 case WSAEMFILE: errno = EMFILE; break;
6301 case WSAENAMETOOLONG: errno = ENAMETOOLONG; break;
6302 case WSAENOTEMPTY: errno = ENOTEMPTY; break;
6303 default: errno = wsa_err; break;
6304 }
6305}
6306
6307static void
6308check_errno (void)
6309{
6310 h_errno = 0;
6311 if (winsock_lib != NULL)
6312 pfn_WSASetLastError (0);
6313}
6314
6315/* Extend strerror to handle the winsock-specific error codes. */
6316struct {
6317 int errnum;
6318 char * msg;
6319} _wsa_errlist[] = {
6320 {WSAEINTR , "Interrupted function call"},
6321 {WSAEBADF , "Bad file descriptor"},
6322 {WSAEACCES , "Permission denied"},
6323 {WSAEFAULT , "Bad address"},
6324 {WSAEINVAL , "Invalid argument"},
6325 {WSAEMFILE , "Too many open files"},
6326
6327 {WSAEWOULDBLOCK , "Resource temporarily unavailable"},
6328 {WSAEINPROGRESS , "Operation now in progress"},
6329 {WSAEALREADY , "Operation already in progress"},
6330 {WSAENOTSOCK , "Socket operation on non-socket"},
6331 {WSAEDESTADDRREQ , "Destination address required"},
6332 {WSAEMSGSIZE , "Message too long"},
6333 {WSAEPROTOTYPE , "Protocol wrong type for socket"},
6334 {WSAENOPROTOOPT , "Bad protocol option"},
6335 {WSAEPROTONOSUPPORT , "Protocol not supported"},
6336 {WSAESOCKTNOSUPPORT , "Socket type not supported"},
6337 {WSAEOPNOTSUPP , "Operation not supported"},
6338 {WSAEPFNOSUPPORT , "Protocol family not supported"},
6339 {WSAEAFNOSUPPORT , "Address family not supported by protocol family"},
6340 {WSAEADDRINUSE , "Address already in use"},
6341 {WSAEADDRNOTAVAIL , "Cannot assign requested address"},
6342 {WSAENETDOWN , "Network is down"},
6343 {WSAENETUNREACH , "Network is unreachable"},
6344 {WSAENETRESET , "Network dropped connection on reset"},
6345 {WSAECONNABORTED , "Software caused connection abort"},
6346 {WSAECONNRESET , "Connection reset by peer"},
6347 {WSAENOBUFS , "No buffer space available"},
6348 {WSAEISCONN , "Socket is already connected"},
6349 {WSAENOTCONN , "Socket is not connected"},
6350 {WSAESHUTDOWN , "Cannot send after socket shutdown"},
6351 {WSAETOOMANYREFS , "Too many references"}, /* not sure */
6352 {WSAETIMEDOUT , "Connection timed out"},
6353 {WSAECONNREFUSED , "Connection refused"},
6354 {WSAELOOP , "Network loop"}, /* not sure */
6355 {WSAENAMETOOLONG , "Name is too long"},
6356 {WSAEHOSTDOWN , "Host is down"},
6357 {WSAEHOSTUNREACH , "No route to host"},
6358 {WSAENOTEMPTY , "Buffer not empty"}, /* not sure */
6359 {WSAEPROCLIM , "Too many processes"},
6360 {WSAEUSERS , "Too many users"}, /* not sure */
6361 {WSAEDQUOT , "Double quote in host name"}, /* really not sure */
6362 {WSAESTALE , "Data is stale"}, /* not sure */
6363 {WSAEREMOTE , "Remote error"}, /* not sure */
6364
6365 {WSASYSNOTREADY , "Network subsystem is unavailable"},
6366 {WSAVERNOTSUPPORTED , "WINSOCK.DLL version out of range"},
6367 {WSANOTINITIALISED , "Winsock not initialized successfully"},
6368 {WSAEDISCON , "Graceful shutdown in progress"},
6369#ifdef WSAENOMORE
6370 {WSAENOMORE , "No more operations allowed"}, /* not sure */
6371 {WSAECANCELLED , "Operation cancelled"}, /* not sure */
6372 {WSAEINVALIDPROCTABLE , "Invalid procedure table from service provider"},
6373 {WSAEINVALIDPROVIDER , "Invalid service provider version number"},
6374 {WSAEPROVIDERFAILEDINIT , "Unable to initialize a service provider"},
6375 {WSASYSCALLFAILURE , "System call failure"},
6376 {WSASERVICE_NOT_FOUND , "Service not found"}, /* not sure */
6377 {WSATYPE_NOT_FOUND , "Class type not found"},
6378 {WSA_E_NO_MORE , "No more resources available"}, /* really not sure */
6379 {WSA_E_CANCELLED , "Operation already cancelled"}, /* really not sure */
6380 {WSAEREFUSED , "Operation refused"}, /* not sure */
6381#endif
6382
6383 {WSAHOST_NOT_FOUND , "Host not found"},
6384 {WSATRY_AGAIN , "Authoritative host not found during name lookup"},
6385 {WSANO_RECOVERY , "Non-recoverable error during name lookup"},
6386 {WSANO_DATA , "Valid name, no data record of requested type"},
6387
6388 {-1, NULL}
6389};
6390
6391char *
6392sys_strerror (int error_no)
6393{
6394 int i;
6395 static char unknown_msg[40];
6396
6397 if (error_no >= 0 && error_no < sys_nerr)
6398 return sys_errlist[error_no];
6399
6400 for (i = 0; _wsa_errlist[i].errnum >= 0; i++)
6401 if (_wsa_errlist[i].errnum == error_no)
6402 return _wsa_errlist[i].msg;
6403
6404 sprintf (unknown_msg, "Unidentified error: %d", error_no);
6405 return unknown_msg;
6406}
6407
6408/* [andrewi 3-May-96] I've had conflicting results using both methods,
6409 but I believe the method of keeping the socket handle separate (and
6410 insuring it is not inheritable) is the correct one. */
6411
6412#define SOCK_HANDLE(fd) ((SOCKET) fd_info[fd].hnd)
6413
6414static int socket_to_fd (SOCKET s);
6415
6416int
6417sys_socket (int af, int type, int protocol)
6418{
6419 SOCKET s;
6420
6421 if (winsock_lib == NULL)
6422 {
6423 errno = ENETDOWN;
6424 return INVALID_SOCKET;
6425 }
6426
6427 check_errno ();
6428
6429 /* call the real socket function */
6430 s = pfn_socket (af, type, protocol);
6431
6432 if (s != INVALID_SOCKET)
6433 return socket_to_fd (s);
6434
6435 set_errno ();
6436 return -1;
6437}
6438
6439/* Convert a SOCKET to a file descriptor. */
6440static int
6441socket_to_fd (SOCKET s)
6442{
6443 int fd;
6444 child_process * cp;
6445
6446 /* Although under NT 3.5 _open_osfhandle will accept a socket
6447 handle, if opened with SO_OPENTYPE == SO_SYNCHRONOUS_NONALERT,
6448 that does not work under NT 3.1. However, we can get the same
6449 effect by using a backdoor function to replace an existing
6450 descriptor handle with the one we want. */
6451
6452 /* allocate a file descriptor (with appropriate flags) */
6453 fd = _open ("NUL:", _O_RDWR);
6454 if (fd >= 0)
6455 {
6456 /* Make a non-inheritable copy of the socket handle. Note
6457 that it is possible that sockets aren't actually kernel
6458 handles, which appears to be the case on Windows 9x when
6459 the MS Proxy winsock client is installed. */
6460 {
6461 /* Apparently there is a bug in NT 3.51 with some service
6462 packs, which prevents using DuplicateHandle to make a
6463 socket handle non-inheritable (causes WSACleanup to
6464 hang). The work-around is to use SetHandleInformation
6465 instead if it is available and implemented. */
6466 if (pfn_SetHandleInformation)
6467 {
6468 pfn_SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
6469 }
6470 else
6471 {
6472 HANDLE parent = GetCurrentProcess ();
6473 HANDLE new_s = INVALID_HANDLE_VALUE;
6474
6475 if (DuplicateHandle (parent,
6476 (HANDLE) s,
6477 parent,
6478 &new_s,
6479 0,
6480 FALSE,
6481 DUPLICATE_SAME_ACCESS))
6482 {
6483 /* It is possible that DuplicateHandle succeeds even
6484 though the socket wasn't really a kernel handle,
6485 because a real handle has the same value. So
6486 test whether the new handle really is a socket. */
6487 long nonblocking = 0;
6488 if (pfn_ioctlsocket ((SOCKET) new_s, FIONBIO, &nonblocking) == 0)
6489 {
6490 pfn_closesocket (s);
6491 s = (SOCKET) new_s;
6492 }
6493 else
6494 {
6495 CloseHandle (new_s);
6496 }
6497 }
6498 }
6499 }
6500 eassert (fd < MAXDESC);
6501 fd_info[fd].hnd = (HANDLE) s;
6502
6503 /* set our own internal flags */
6504 fd_info[fd].flags = FILE_SOCKET | FILE_BINARY | FILE_READ | FILE_WRITE;
6505
6506 cp = new_child ();
6507 if (cp)
6508 {
6509 cp->fd = fd;
6510 cp->status = STATUS_READ_ACKNOWLEDGED;
6511
6512 /* attach child_process to fd_info */
6513 if (fd_info[ fd ].cp != NULL)
6514 {
6515 DebPrint (("sys_socket: fd_info[%d] apparently in use!\n", fd));
6516 emacs_abort ();
6517 }
6518
6519 fd_info[ fd ].cp = cp;
6520
6521 /* success! */
6522 winsock_inuse++; /* count open sockets */
6523 return fd;
6524 }
6525
6526 /* clean up */
6527 _close (fd);
6528 }
6529 else
6530 pfn_closesocket (s);
6531 errno = EMFILE;
6532 return -1;
6533}
6534
6535int
6536sys_bind (int s, const struct sockaddr * addr, int namelen)
6537{
6538 if (winsock_lib == NULL)
6539 {
6540 errno = ENOTSOCK;
6541 return SOCKET_ERROR;
6542 }
6543
6544 check_errno ();
6545 if (fd_info[s].flags & FILE_SOCKET)
6546 {
6547 int rc = pfn_bind (SOCK_HANDLE (s), addr, namelen);
6548 if (rc == SOCKET_ERROR)
6549 set_errno ();
6550 return rc;
6551 }
6552 errno = ENOTSOCK;
6553 return SOCKET_ERROR;
6554}
6555
6556int
6557sys_connect (int s, const struct sockaddr * name, int namelen)
6558{
6559 if (winsock_lib == NULL)
6560 {
6561 errno = ENOTSOCK;
6562 return SOCKET_ERROR;
6563 }
6564
6565 check_errno ();
6566 if (fd_info[s].flags & FILE_SOCKET)
6567 {
6568 int rc = pfn_connect (SOCK_HANDLE (s), name, namelen);
6569 if (rc == SOCKET_ERROR)
6570 set_errno ();
6571 return rc;
6572 }
6573 errno = ENOTSOCK;
6574 return SOCKET_ERROR;
6575}
6576
6577u_short
6578sys_htons (u_short hostshort)
6579{
6580 return (winsock_lib != NULL) ?
6581 pfn_htons (hostshort) : hostshort;
6582}
6583
6584u_short
6585sys_ntohs (u_short netshort)
6586{
6587 return (winsock_lib != NULL) ?
6588 pfn_ntohs (netshort) : netshort;
6589}
6590
6591unsigned long
6592sys_inet_addr (const char * cp)
6593{
6594 return (winsock_lib != NULL) ?
6595 pfn_inet_addr (cp) : INADDR_NONE;
6596}
6597
6598int
6599sys_gethostname (char * name, int namelen)
6600{
6601 if (winsock_lib != NULL)
6602 {
6603 int retval;
6604
6605 check_errno ();
6606 retval = pfn_gethostname (name, namelen);
6607 if (retval == SOCKET_ERROR)
6608 set_errno ();
6609 return retval;
6610 }
6611
6612 if (namelen > MAX_COMPUTERNAME_LENGTH)
6613 return !GetComputerName (name, (DWORD *)&namelen);
6614
6615 errno = EFAULT;
6616 return SOCKET_ERROR;
6617}
6618
6619struct hostent *
6620sys_gethostbyname (const char * name)
6621{
6622 struct hostent * host;
6623 int h_err = h_errno;
6624
6625 if (winsock_lib == NULL)
6626 {
6627 h_errno = NO_RECOVERY;
6628 errno = ENETDOWN;
6629 return NULL;
6630 }
6631
6632 check_errno ();
6633 host = pfn_gethostbyname (name);
6634 if (!host)
6635 {
6636 set_errno ();
6637 h_errno = errno;
6638 }
6639 else
6640 h_errno = h_err;
6641 return host;
6642}
6643
6644struct servent *
6645sys_getservbyname (const char * name, const char * proto)
6646{
6647 struct servent * serv;
6648
6649 if (winsock_lib == NULL)
6650 {
6651 errno = ENETDOWN;
6652 return NULL;
6653 }
6654
6655 check_errno ();
6656 serv = pfn_getservbyname (name, proto);
6657 if (!serv)
6658 set_errno ();
6659 return serv;
6660}
6661
6662int
6663sys_getpeername (int s, struct sockaddr *addr, int * namelen)
6664{
6665 if (winsock_lib == NULL)
6666 {
6667 errno = ENETDOWN;
6668 return SOCKET_ERROR;
6669 }
6670
6671 check_errno ();
6672 if (fd_info[s].flags & FILE_SOCKET)
6673 {
6674 int rc = pfn_getpeername (SOCK_HANDLE (s), addr, namelen);
6675 if (rc == SOCKET_ERROR)
6676 set_errno ();
6677 return rc;
6678 }
6679 errno = ENOTSOCK;
6680 return SOCKET_ERROR;
6681}
6682
6683int
6684sys_shutdown (int s, int how)
6685{
6686 if (winsock_lib == NULL)
6687 {
6688 errno = ENETDOWN;
6689 return SOCKET_ERROR;
6690 }
6691
6692 check_errno ();
6693 if (fd_info[s].flags & FILE_SOCKET)
6694 {
6695 int rc = pfn_shutdown (SOCK_HANDLE (s), how);
6696 if (rc == SOCKET_ERROR)
6697 set_errno ();
6698 return rc;
6699 }
6700 errno = ENOTSOCK;
6701 return SOCKET_ERROR;
6702}
6703
6704int
6705sys_setsockopt (int s, int level, int optname, const void * optval, int optlen)
6706{
6707 if (winsock_lib == NULL)
6708 {
6709 errno = ENETDOWN;
6710 return SOCKET_ERROR;
6711 }
6712
6713 check_errno ();
6714 if (fd_info[s].flags & FILE_SOCKET)
6715 {
6716 int rc = pfn_setsockopt (SOCK_HANDLE (s), level, optname,
6717 (const char *)optval, optlen);
6718 if (rc == SOCKET_ERROR)
6719 set_errno ();
6720 return rc;
6721 }
6722 errno = ENOTSOCK;
6723 return SOCKET_ERROR;
6724}
6725
6726int
6727sys_listen (int s, int backlog)
6728{
6729 if (winsock_lib == NULL)
6730 {
6731 errno = ENETDOWN;
6732 return SOCKET_ERROR;
6733 }
6734
6735 check_errno ();
6736 if (fd_info[s].flags & FILE_SOCKET)
6737 {
6738 int rc = pfn_listen (SOCK_HANDLE (s), backlog);
6739 if (rc == SOCKET_ERROR)
6740 set_errno ();
6741 else
6742 fd_info[s].flags |= FILE_LISTEN;
6743 return rc;
6744 }
6745 errno = ENOTSOCK;
6746 return SOCKET_ERROR;
6747}
6748
6749int
6750sys_getsockname (int s, struct sockaddr * name, int * namelen)
6751{
6752 if (winsock_lib == NULL)
6753 {
6754 errno = ENETDOWN;
6755 return SOCKET_ERROR;
6756 }
6757
6758 check_errno ();
6759 if (fd_info[s].flags & FILE_SOCKET)
6760 {
6761 int rc = pfn_getsockname (SOCK_HANDLE (s), name, namelen);
6762 if (rc == SOCKET_ERROR)
6763 set_errno ();
6764 return rc;
6765 }
6766 errno = ENOTSOCK;
6767 return SOCKET_ERROR;
6768}
6769
6770int
6771sys_accept (int s, struct sockaddr * addr, int * addrlen)
6772{
6773 if (winsock_lib == NULL)
6774 {
6775 errno = ENETDOWN;
6776 return -1;
6777 }
6778
6779 check_errno ();
6780 if (fd_info[s].flags & FILE_LISTEN)
6781 {
6782 SOCKET t = pfn_accept (SOCK_HANDLE (s), addr, addrlen);
6783 int fd = -1;
6784 if (t == INVALID_SOCKET)
6785 set_errno ();
6786 else
6787 fd = socket_to_fd (t);
6788
6789 if (fd >= 0)
6790 {
6791 fd_info[s].cp->status = STATUS_READ_ACKNOWLEDGED;
6792 ResetEvent (fd_info[s].cp->char_avail);
6793 }
6794 return fd;
6795 }
6796 errno = ENOTSOCK;
6797 return -1;
6798}
6799
6800int
6801sys_recvfrom (int s, char * buf, int len, int flags,
6802 struct sockaddr * from, int * fromlen)
6803{
6804 if (winsock_lib == NULL)
6805 {
6806 errno = ENETDOWN;
6807 return SOCKET_ERROR;
6808 }
6809
6810 check_errno ();
6811 if (fd_info[s].flags & FILE_SOCKET)
6812 {
6813 int rc = pfn_recvfrom (SOCK_HANDLE (s), buf, len, flags, from, fromlen);
6814 if (rc == SOCKET_ERROR)
6815 set_errno ();
6816 return rc;
6817 }
6818 errno = ENOTSOCK;
6819 return SOCKET_ERROR;
6820}
6821
6822int
6823sys_sendto (int s, const char * buf, int len, int flags,
6824 const struct sockaddr * to, int tolen)
6825{
6826 if (winsock_lib == NULL)
6827 {
6828 errno = ENETDOWN;
6829 return SOCKET_ERROR;
6830 }
6831
6832 check_errno ();
6833 if (fd_info[s].flags & FILE_SOCKET)
6834 {
6835 int rc = pfn_sendto (SOCK_HANDLE (s), buf, len, flags, to, tolen);
6836 if (rc == SOCKET_ERROR)
6837 set_errno ();
6838 return rc;
6839 }
6840 errno = ENOTSOCK;
6841 return SOCKET_ERROR;
6842}
6843
6844/* Windows does not have an fcntl function. Provide an implementation
6845 good enough for Emacs. */
6846int
6847fcntl (int s, int cmd, int options)
6848{
6849 /* In the w32 Emacs port, fcntl (fd, F_DUPFD_CLOEXEC, fd1) is always
6850 invoked in a context where fd1 is closed and all descriptors less
6851 than fd1 are open, so sys_dup is an adequate implementation. */
6852 if (cmd == F_DUPFD_CLOEXEC)
6853 return sys_dup (s);
6854
6855 if (winsock_lib == NULL)
6856 {
6857 errno = ENETDOWN;
6858 return -1;
6859 }
6860
6861 check_errno ();
6862 if (fd_info[s].flags & FILE_SOCKET)
6863 {
6864 if (cmd == F_SETFL && options == O_NONBLOCK)
6865 {
6866 unsigned long nblock = 1;
6867 int rc = pfn_ioctlsocket (SOCK_HANDLE (s), FIONBIO, &nblock);
6868 if (rc == SOCKET_ERROR)
6869 set_errno ();
6870 /* Keep track of the fact that we set this to non-blocking. */
6871 fd_info[s].flags |= FILE_NDELAY;
6872 return rc;
6873 }
6874 else
6875 {
6876 errno = EINVAL;
6877 return SOCKET_ERROR;
6878 }
6879 }
6880 errno = ENOTSOCK;
6881 return SOCKET_ERROR;
6882}
6883
6884
6885/* Shadow main io functions: we need to handle pipes and sockets more
6886 intelligently, and implement non-blocking mode as well. */
6887
6888int
6889sys_close (int fd)
6890{
6891 int rc;
6892
6893 if (fd < 0)
6894 {
6895 errno = EBADF;
6896 return -1;
6897 }
6898
6899 if (fd < MAXDESC && fd_info[fd].cp)
6900 {
6901 child_process * cp = fd_info[fd].cp;
6902
6903 fd_info[fd].cp = NULL;
6904
6905 if (CHILD_ACTIVE (cp))
6906 {
6907 /* if last descriptor to active child_process then cleanup */
6908 int i;
6909 for (i = 0; i < MAXDESC; i++)
6910 {
6911 if (i == fd)
6912 continue;
6913 if (fd_info[i].cp == cp)
6914 break;
6915 }
6916 if (i == MAXDESC)
6917 {
6918 if (fd_info[fd].flags & FILE_SOCKET)
6919 {
6920 if (winsock_lib == NULL) emacs_abort ();
6921
6922 pfn_shutdown (SOCK_HANDLE (fd), 2);
6923 rc = pfn_closesocket (SOCK_HANDLE (fd));
6924
6925 winsock_inuse--; /* count open sockets */
6926 }
6927 /* If the process handle is NULL, it's either a socket
6928 or serial connection, or a subprocess that was
6929 already reaped by reap_subprocess, but whose
6930 resources were not yet freed, because its output was
6931 not fully read yet by the time it was reaped. (This
6932 usually happens with async subprocesses whose output
6933 is being read by Emacs.) Otherwise, this process was
6934 not reaped yet, so we set its FD to a negative value
6935 to make sure sys_select will eventually get to
6936 calling the SIGCHLD handler for it, which will then
6937 invoke waitpid and reap_subprocess. */
6938 if (cp->procinfo.hProcess == NULL)
6939 delete_child (cp);
6940 else
6941 cp->fd = -1;
6942 }
6943 }
6944 }
6945
6946 if (fd >= 0 && fd < MAXDESC)
6947 fd_info[fd].flags = 0;
6948
6949 /* Note that sockets do not need special treatment here (at least on
6950 NT and Windows 95 using the standard tcp/ip stacks) - it appears that
6951 closesocket is equivalent to CloseHandle, which is to be expected
6952 because socket handles are fully fledged kernel handles. */
6953 rc = _close (fd);
6954
6955 return rc;
6956}
6957
6958int
6959sys_dup (int fd)
6960{
6961 int new_fd;
6962
6963 new_fd = _dup (fd);
6964 if (new_fd >= 0 && new_fd < MAXDESC)
6965 {
6966 /* duplicate our internal info as well */
6967 fd_info[new_fd] = fd_info[fd];
6968 }
6969 return new_fd;
6970}
6971
6972int
6973sys_dup2 (int src, int dst)
6974{
6975 int rc;
6976
6977 if (dst < 0 || dst >= MAXDESC)
6978 {
6979 errno = EBADF;
6980 return -1;
6981 }
6982
6983 /* make sure we close the destination first if it's a pipe or socket */
6984 if (src != dst && fd_info[dst].flags != 0)
6985 sys_close (dst);
6986
6987 rc = _dup2 (src, dst);
6988 if (rc == 0)
6989 {
6990 /* duplicate our internal info as well */
6991 fd_info[dst] = fd_info[src];
6992 }
6993 return rc;
6994}
6995
6996int
6997pipe2 (int * phandles, int pipe2_flags)
6998{
6999 int rc;
7000 unsigned flags;
7001
7002 eassert (pipe2_flags == O_CLOEXEC);
7003
7004 /* make pipe handles non-inheritable; when we spawn a child, we
7005 replace the relevant handle with an inheritable one. Also put
7006 pipes into binary mode; we will do text mode translation ourselves
7007 if required. */
7008 rc = _pipe (phandles, 0, _O_NOINHERIT | _O_BINARY);
7009
7010 if (rc == 0)
7011 {
7012 /* Protect against overflow, since Windows can open more handles than
7013 our fd_info array has room for. */
7014 if (phandles[0] >= MAXDESC || phandles[1] >= MAXDESC)
7015 {
7016 _close (phandles[0]);
7017 _close (phandles[1]);
7018 errno = EMFILE;
7019 rc = -1;
7020 }
7021 else
7022 {
7023 flags = FILE_PIPE | FILE_READ | FILE_BINARY;
7024 fd_info[phandles[0]].flags = flags;
7025
7026 flags = FILE_PIPE | FILE_WRITE | FILE_BINARY;
7027 fd_info[phandles[1]].flags = flags;
7028 }
7029 }
7030
7031 return rc;
7032}
7033
7034/* Function to do blocking read of one byte, needed to implement
7035 select. It is only allowed on communication ports, sockets, or
7036 pipes. */
7037int
7038_sys_read_ahead (int fd)
7039{
7040 child_process * cp;
7041 int rc;
7042
7043 if (fd < 0 || fd >= MAXDESC)
7044 return STATUS_READ_ERROR;
7045
7046 cp = fd_info[fd].cp;
7047
7048 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
7049 return STATUS_READ_ERROR;
7050
7051 if ((fd_info[fd].flags & (FILE_PIPE | FILE_SERIAL | FILE_SOCKET)) == 0
7052 || (fd_info[fd].flags & FILE_READ) == 0)
7053 {
7054 DebPrint (("_sys_read_ahead: internal error: fd %d is not a pipe, serial port, or socket!\n", fd));
7055 emacs_abort ();
7056 }
7057
7058 cp->status = STATUS_READ_IN_PROGRESS;
7059
7060 if (fd_info[fd].flags & FILE_PIPE)
7061 {
7062 rc = _read (fd, &cp->chr, sizeof (char));
7063
7064 /* Give subprocess time to buffer some more output for us before
7065 reporting that input is available; we need this because Windows 95
7066 connects DOS programs to pipes by making the pipe appear to be
7067 the normal console stdout - as a result most DOS programs will
7068 write to stdout without buffering, ie. one character at a
7069 time. Even some W32 programs do this - "dir" in a command
7070 shell on NT is very slow if we don't do this. */
7071 if (rc > 0)
7072 {
7073 int wait = w32_pipe_read_delay;
7074
7075 if (wait > 0)
7076 Sleep (wait);
7077 else if (wait < 0)
7078 while (++wait <= 0)
7079 /* Yield remainder of our time slice, effectively giving a
7080 temporary priority boost to the child process. */
7081 Sleep (0);
7082 }
7083 }
7084 else if (fd_info[fd].flags & FILE_SERIAL)
7085 {
7086 HANDLE hnd = fd_info[fd].hnd;
7087 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
7088 COMMTIMEOUTS ct;
7089
7090 /* Configure timeouts for blocking read. */
7091 if (!GetCommTimeouts (hnd, &ct))
7092 {
7093 cp->status = STATUS_READ_ERROR;
7094 return STATUS_READ_ERROR;
7095 }
7096 ct.ReadIntervalTimeout = 0;
7097 ct.ReadTotalTimeoutMultiplier = 0;
7098 ct.ReadTotalTimeoutConstant = 0;
7099 if (!SetCommTimeouts (hnd, &ct))
7100 {
7101 cp->status = STATUS_READ_ERROR;
7102 return STATUS_READ_ERROR;
7103 }
7104
7105 if (!ReadFile (hnd, &cp->chr, sizeof (char), (DWORD*) &rc, ovl))
7106 {
7107 if (GetLastError () != ERROR_IO_PENDING)
7108 {
7109 cp->status = STATUS_READ_ERROR;
7110 return STATUS_READ_ERROR;
7111 }
7112 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
7113 {
7114 cp->status = STATUS_READ_ERROR;
7115 return STATUS_READ_ERROR;
7116 }
7117 }
7118 }
7119 else if (fd_info[fd].flags & FILE_SOCKET)
7120 {
7121 unsigned long nblock = 0;
7122 /* We always want this to block, so temporarily disable NDELAY. */
7123 if (fd_info[fd].flags & FILE_NDELAY)
7124 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7125
7126 rc = pfn_recv (SOCK_HANDLE (fd), &cp->chr, sizeof (char), 0);
7127
7128 if (fd_info[fd].flags & FILE_NDELAY)
7129 {
7130 nblock = 1;
7131 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7132 }
7133 }
7134
7135 if (rc == sizeof (char))
7136 cp->status = STATUS_READ_SUCCEEDED;
7137 else
7138 cp->status = STATUS_READ_FAILED;
7139
7140 return cp->status;
7141}
7142
7143int
7144_sys_wait_accept (int fd)
7145{
7146 HANDLE hEv;
7147 child_process * cp;
7148 int rc;
7149
7150 if (fd < 0 || fd >= MAXDESC)
7151 return STATUS_READ_ERROR;
7152
7153 cp = fd_info[fd].cp;
7154
7155 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
7156 return STATUS_READ_ERROR;
7157
7158 cp->status = STATUS_READ_FAILED;
7159
7160 hEv = pfn_WSACreateEvent ();
7161 rc = pfn_WSAEventSelect (SOCK_HANDLE (fd), hEv, FD_ACCEPT);
7162 if (rc != SOCKET_ERROR)
7163 {
7164 do {
7165 rc = WaitForSingleObject (hEv, 500);
7166 Sleep (5);
7167 } while (rc == WAIT_TIMEOUT
7168 && cp->status != STATUS_READ_ERROR
7169 && cp->char_avail);
7170 pfn_WSAEventSelect (SOCK_HANDLE (fd), NULL, 0);
7171 if (rc == WAIT_OBJECT_0)
7172 cp->status = STATUS_READ_SUCCEEDED;
7173 }
7174 pfn_WSACloseEvent (hEv);
7175
7176 return cp->status;
7177}
7178
7179int
7180sys_read (int fd, char * buffer, unsigned int count)
7181{
7182 int nchars;
7183 int to_read;
7184 DWORD waiting;
7185 char * orig_buffer = buffer;
7186
7187 if (fd < 0)
7188 {
7189 errno = EBADF;
7190 return -1;
7191 }
7192
7193 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
7194 {
7195 child_process *cp = fd_info[fd].cp;
7196
7197 if ((fd_info[fd].flags & FILE_READ) == 0)
7198 {
7199 errno = EBADF;
7200 return -1;
7201 }
7202
7203 nchars = 0;
7204
7205 /* re-read CR carried over from last read */
7206 if (fd_info[fd].flags & FILE_LAST_CR)
7207 {
7208 if (fd_info[fd].flags & FILE_BINARY) emacs_abort ();
7209 *buffer++ = 0x0d;
7210 count--;
7211 nchars++;
7212 fd_info[fd].flags &= ~FILE_LAST_CR;
7213 }
7214
7215 /* presence of a child_process structure means we are operating in
7216 non-blocking mode - otherwise we just call _read directly.
7217 Note that the child_process structure might be missing because
7218 reap_subprocess has been called; in this case the pipe is
7219 already broken, so calling _read on it is okay. */
7220 if (cp)
7221 {
7222 int current_status = cp->status;
7223
7224 switch (current_status)
7225 {
7226 case STATUS_READ_FAILED:
7227 case STATUS_READ_ERROR:
7228 /* report normal EOF if nothing in buffer */
7229 if (nchars <= 0)
7230 fd_info[fd].flags |= FILE_AT_EOF;
7231 return nchars;
7232
7233 case STATUS_READ_READY:
7234 case STATUS_READ_IN_PROGRESS:
7235 DebPrint (("sys_read called when read is in progress\n"));
7236 errno = EWOULDBLOCK;
7237 return -1;
7238
7239 case STATUS_READ_SUCCEEDED:
7240 /* consume read-ahead char */
7241 *buffer++ = cp->chr;
7242 count--;
7243 nchars++;
7244 cp->status = STATUS_READ_ACKNOWLEDGED;
7245 ResetEvent (cp->char_avail);
7246
7247 case STATUS_READ_ACKNOWLEDGED:
7248 break;
7249
7250 default:
7251 DebPrint (("sys_read: bad status %d\n", current_status));
7252 errno = EBADF;
7253 return -1;
7254 }
7255
7256 if (fd_info[fd].flags & FILE_PIPE)
7257 {
7258 PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
7259 to_read = min (waiting, (DWORD) count);
7260
7261 if (to_read > 0)
7262 nchars += _read (fd, buffer, to_read);
7263 }
7264 else if (fd_info[fd].flags & FILE_SERIAL)
7265 {
7266 HANDLE hnd = fd_info[fd].hnd;
7267 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
7268 int rc = 0;
7269 COMMTIMEOUTS ct;
7270
7271 if (count > 0)
7272 {
7273 /* Configure timeouts for non-blocking read. */
7274 if (!GetCommTimeouts (hnd, &ct))
7275 {
7276 errno = EIO;
7277 return -1;
7278 }
7279 ct.ReadIntervalTimeout = MAXDWORD;
7280 ct.ReadTotalTimeoutMultiplier = 0;
7281 ct.ReadTotalTimeoutConstant = 0;
7282 if (!SetCommTimeouts (hnd, &ct))
7283 {
7284 errno = EIO;
7285 return -1;
7286 }
7287
7288 if (!ResetEvent (ovl->hEvent))
7289 {
7290 errno = EIO;
7291 return -1;
7292 }
7293 if (!ReadFile (hnd, buffer, count, (DWORD*) &rc, ovl))
7294 {
7295 if (GetLastError () != ERROR_IO_PENDING)
7296 {
7297 errno = EIO;
7298 return -1;
7299 }
7300 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
7301 {
7302 errno = EIO;
7303 return -1;
7304 }
7305 }
7306 nchars += rc;
7307 }
7308 }
7309 else /* FILE_SOCKET */
7310 {
7311 if (winsock_lib == NULL) emacs_abort ();
7312
7313 /* do the equivalent of a non-blocking read */
7314 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONREAD, &waiting);
7315 if (waiting == 0 && nchars == 0)
7316 {
7317 errno = EWOULDBLOCK;
7318 return -1;
7319 }
7320
7321 if (waiting)
7322 {
7323 /* always use binary mode for sockets */
7324 int res = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
7325 if (res == SOCKET_ERROR)
7326 {
7327 DebPrint (("sys_read.recv failed with error %d on socket %ld\n",
7328 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
7329 set_errno ();
7330 return -1;
7331 }
7332 nchars += res;
7333 }
7334 }
7335 }
7336 else
7337 {
7338 int nread = _read (fd, buffer, count);
7339 if (nread >= 0)
7340 nchars += nread;
7341 else if (nchars == 0)
7342 nchars = nread;
7343 }
7344
7345 if (nchars <= 0)
7346 fd_info[fd].flags |= FILE_AT_EOF;
7347 /* Perform text mode translation if required. */
7348 else if ((fd_info[fd].flags & FILE_BINARY) == 0)
7349 {
7350 nchars = crlf_to_lf (nchars, orig_buffer);
7351 /* If buffer contains only CR, return that. To be absolutely
7352 sure we should attempt to read the next char, but in
7353 practice a CR to be followed by LF would not appear by
7354 itself in the buffer. */
7355 if (nchars > 1 && orig_buffer[nchars - 1] == 0x0d)
7356 {
7357 fd_info[fd].flags |= FILE_LAST_CR;
7358 nchars--;
7359 }
7360 }
7361 }
7362 else
7363 nchars = _read (fd, buffer, count);
7364
7365 return nchars;
7366}
7367
7368/* From w32xfns.c */
7369extern HANDLE interrupt_handle;
7370
7371/* For now, don't bother with a non-blocking mode */
7372int
7373sys_write (int fd, const void * buffer, unsigned int count)
7374{
7375 int nchars;
7376
7377 if (fd < 0)
7378 {
7379 errno = EBADF;
7380 return -1;
7381 }
7382
7383 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
7384 {
7385 if ((fd_info[fd].flags & FILE_WRITE) == 0)
7386 {
7387 errno = EBADF;
7388 return -1;
7389 }
7390
7391 /* Perform text mode translation if required. */
7392 if ((fd_info[fd].flags & FILE_BINARY) == 0)
7393 {
7394 char * tmpbuf = alloca (count * 2);
7395 unsigned char * src = (void *)buffer;
7396 unsigned char * dst = tmpbuf;
7397 int nbytes = count;
7398
7399 while (1)
7400 {
7401 unsigned char *next;
7402 /* copy next line or remaining bytes */
7403 next = _memccpy (dst, src, '\n', nbytes);
7404 if (next)
7405 {
7406 /* copied one line ending with '\n' */
7407 int copied = next - dst;
7408 nbytes -= copied;
7409 src += copied;
7410 /* insert '\r' before '\n' */
7411 next[-1] = '\r';
7412 next[0] = '\n';
7413 dst = next + 1;
7414 count++;
7415 }
7416 else
7417 /* copied remaining partial line -> now finished */
7418 break;
7419 }
7420 buffer = tmpbuf;
7421 }
7422 }
7423
7424 if (fd < MAXDESC && fd_info[fd].flags & FILE_SERIAL)
7425 {
7426 HANDLE hnd = (HANDLE) _get_osfhandle (fd);
7427 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_write;
7428 HANDLE wait_hnd[2] = { interrupt_handle, ovl->hEvent };
7429 DWORD active = 0;
7430
7431 if (!WriteFile (hnd, buffer, count, (DWORD*) &nchars, ovl))
7432 {
7433 if (GetLastError () != ERROR_IO_PENDING)
7434 {
7435 errno = EIO;
7436 return -1;
7437 }
7438 if (detect_input_pending ())
7439 active = MsgWaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE,
7440 QS_ALLINPUT);
7441 else
7442 active = WaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE);
7443 if (active == WAIT_OBJECT_0)
7444 { /* User pressed C-g, cancel write, then leave. Don't bother
7445 cleaning up as we may only get stuck in buggy drivers. */
7446 PurgeComm (hnd, PURGE_TXABORT | PURGE_TXCLEAR);
7447 CancelIo (hnd);
7448 errno = EIO;
7449 return -1;
7450 }
7451 if (active == WAIT_OBJECT_0 + 1
7452 && !GetOverlappedResult (hnd, ovl, (DWORD*) &nchars, TRUE))
7453 {
7454 errno = EIO;
7455 return -1;
7456 }
7457 }
7458 }
7459 else if (fd < MAXDESC && fd_info[fd].flags & FILE_SOCKET)
7460 {
7461 unsigned long nblock = 0;
7462 if (winsock_lib == NULL) emacs_abort ();
7463
7464 /* TODO: implement select() properly so non-blocking I/O works. */
7465 /* For now, make sure the write blocks. */
7466 if (fd_info[fd].flags & FILE_NDELAY)
7467 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7468
7469 nchars = pfn_send (SOCK_HANDLE (fd), buffer, count, 0);
7470
7471 /* Set the socket back to non-blocking if it was before,
7472 for other operations that support it. */
7473 if (fd_info[fd].flags & FILE_NDELAY)
7474 {
7475 nblock = 1;
7476 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
7477 }
7478
7479 if (nchars == SOCKET_ERROR)
7480 {
7481 DebPrint (("sys_write.send failed with error %d on socket %ld\n",
7482 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
7483 set_errno ();
7484 }
7485 }
7486 else
7487 {
7488 /* Some networked filesystems don't like too large writes, so
7489 break them into smaller chunks. See the Comments section of
7490 the MSDN documentation of WriteFile for details behind the
7491 choice of the value of CHUNK below. See also the thread
7492 http://thread.gmane.org/gmane.comp.version-control.git/145294
7493 in the git mailing list. */
7494 const unsigned char *p = buffer;
7495 const unsigned chunk = 30 * 1024 * 1024;
7496
7497 nchars = 0;
7498 while (count > 0)
7499 {
7500 unsigned this_chunk = count < chunk ? count : chunk;
7501 int n = _write (fd, p, this_chunk);
7502
7503 nchars += n;
7504 if (n < 0)
7505 {
7506 nchars = n;
7507 break;
7508 }
7509 else if (n < this_chunk)
7510 break;
7511 count -= n;
7512 p += n;
7513 }
7514 }
7515
7516 return nchars;
7517}
7518
7519\f
7520/* Emulation of SIOCGIFCONF and getifaddrs, see process.c. */
7521
7522extern Lisp_Object conv_sockaddr_to_lisp (struct sockaddr *, int);
7523
7524/* Return information about network interface IFNAME, or about all
7525 interfaces (if IFNAME is nil). */
7526static Lisp_Object
7527network_interface_get_info (Lisp_Object ifname)
7528{
7529 ULONG ainfo_len = sizeof (IP_ADAPTER_INFO);
7530 IP_ADAPTER_INFO *adapter, *ainfo = xmalloc (ainfo_len);
7531 DWORD retval = get_adapters_info (ainfo, &ainfo_len);
7532 Lisp_Object res = Qnil;
7533
7534 if (retval == ERROR_BUFFER_OVERFLOW)
7535 {
7536 ainfo = xrealloc (ainfo, ainfo_len);
7537 retval = get_adapters_info (ainfo, &ainfo_len);
7538 }
7539
7540 if (retval == ERROR_SUCCESS)
7541 {
7542 int eth_count = 0, tr_count = 0, fddi_count = 0, ppp_count = 0;
7543 int sl_count = 0, wlan_count = 0, lo_count = 0, ifx_count = 0;
7544 int if_num;
7545 struct sockaddr_in sa;
7546
7547 /* For the below, we need some winsock functions, so make sure
7548 the winsock DLL is loaded. If we cannot successfully load
7549 it, they will have no use of the information we provide,
7550 anyway, so punt. */
7551 if (!winsock_lib && !init_winsock (1))
7552 goto done;
7553
7554 for (adapter = ainfo; adapter; adapter = adapter->Next)
7555 {
7556 char namebuf[MAX_ADAPTER_NAME_LENGTH + 4];
7557 u_long ip_addr;
7558 /* Present Unix-compatible interface names, instead of the
7559 Windows names, which are really GUIDs not readable by
7560 humans. */
7561 static const char *ifmt[] = {
7562 "eth%d", "tr%d", "fddi%d", "ppp%d", "sl%d", "wlan%d",
7563 "lo", "ifx%d"
7564 };
7565 enum {
7566 NONE = -1,
7567 ETHERNET = 0,
7568 TOKENRING = 1,
7569 FDDI = 2,
7570 PPP = 3,
7571 SLIP = 4,
7572 WLAN = 5,
7573 LOOPBACK = 6,
7574 OTHER_IF = 7
7575 } ifmt_idx;
7576
7577 switch (adapter->Type)
7578 {
7579 case MIB_IF_TYPE_ETHERNET:
7580 /* Windows before Vista reports wireless adapters as
7581 Ethernet. Work around by looking at the Description
7582 string. */
7583 if (strstr (adapter->Description, "Wireless "))
7584 {
7585 ifmt_idx = WLAN;
7586 if_num = wlan_count++;
7587 }
7588 else
7589 {
7590 ifmt_idx = ETHERNET;
7591 if_num = eth_count++;
7592 }
7593 break;
7594 case MIB_IF_TYPE_TOKENRING:
7595 ifmt_idx = TOKENRING;
7596 if_num = tr_count++;
7597 break;
7598 case MIB_IF_TYPE_FDDI:
7599 ifmt_idx = FDDI;
7600 if_num = fddi_count++;
7601 break;
7602 case MIB_IF_TYPE_PPP:
7603 ifmt_idx = PPP;
7604 if_num = ppp_count++;
7605 break;
7606 case MIB_IF_TYPE_SLIP:
7607 ifmt_idx = SLIP;
7608 if_num = sl_count++;
7609 break;
7610 case IF_TYPE_IEEE80211:
7611 ifmt_idx = WLAN;
7612 if_num = wlan_count++;
7613 break;
7614 case MIB_IF_TYPE_LOOPBACK:
7615 if (lo_count < 0)
7616 {
7617 ifmt_idx = LOOPBACK;
7618 if_num = lo_count++;
7619 }
7620 else
7621 ifmt_idx = NONE;
7622 break;
7623 default:
7624 ifmt_idx = OTHER_IF;
7625 if_num = ifx_count++;
7626 break;
7627 }
7628 if (ifmt_idx == NONE)
7629 continue;
7630 sprintf (namebuf, ifmt[ifmt_idx], if_num);
7631
7632 sa.sin_family = AF_INET;
7633 ip_addr = sys_inet_addr (adapter->IpAddressList.IpAddress.String);
7634 if (ip_addr == INADDR_NONE)
7635 {
7636 /* Bogus address, skip this interface. */
7637 continue;
7638 }
7639 sa.sin_addr.s_addr = ip_addr;
7640 sa.sin_port = 0;
7641 if (NILP (ifname))
7642 res = Fcons (Fcons (build_string (namebuf),
7643 conv_sockaddr_to_lisp ((struct sockaddr*) &sa,
7644 sizeof (struct sockaddr))),
7645 res);
7646 else if (strcmp (namebuf, SSDATA (ifname)) == 0)
7647 {
7648 Lisp_Object hwaddr = Fmake_vector (make_number (6), Qnil);
7649 register struct Lisp_Vector *p = XVECTOR (hwaddr);
7650 Lisp_Object flags = Qnil;
7651 int n;
7652 u_long net_mask;
7653
7654 /* Flags. We guess most of them by type, since the
7655 Windows flags are different and hard to get by. */
7656 flags = Fcons (intern ("up"), flags);
7657 if (ifmt_idx == ETHERNET || ifmt_idx == WLAN)
7658 {
7659 flags = Fcons (intern ("broadcast"), flags);
7660 flags = Fcons (intern ("multicast"), flags);
7661 }
7662 flags = Fcons (intern ("running"), flags);
7663 if (ifmt_idx == PPP)
7664 {
7665 flags = Fcons (intern ("pointopoint"), flags);
7666 flags = Fcons (intern ("noarp"), flags);
7667 }
7668 if (adapter->HaveWins)
7669 flags = Fcons (intern ("WINS"), flags);
7670 if (adapter->DhcpEnabled)
7671 flags = Fcons (intern ("dynamic"), flags);
7672
7673 res = Fcons (flags, res);
7674
7675 /* Hardware address and its family. */
7676 for (n = 0; n < adapter->AddressLength; n++)
7677 p->u.contents[n] = make_number ((int) adapter->Address[n]);
7678 /* Windows does not support AF_LINK or AF_PACKET family
7679 of addresses. Use an arbitrary family number that is
7680 identical to what GNU/Linux returns. */
7681 res = Fcons (Fcons (make_number (1), hwaddr), res);
7682
7683 /* Network mask. */
7684 sa.sin_family = AF_INET;
7685 net_mask = sys_inet_addr (adapter->IpAddressList.IpMask.String);
7686 if (net_mask != INADDR_NONE)
7687 {
7688 sa.sin_addr.s_addr = net_mask;
7689 sa.sin_port = 0;
7690 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7691 sizeof (struct sockaddr)),
7692 res);
7693 }
7694 else
7695 res = Fcons (Qnil, res);
7696
7697 sa.sin_family = AF_INET;
7698 if (ip_addr != INADDR_NONE)
7699 {
7700 /* Broadcast address is only reported by
7701 GetAdaptersAddresses, which is of limited
7702 availability. Generate it on our own. */
7703 u_long bcast_addr = (ip_addr & net_mask) | ~net_mask;
7704
7705 sa.sin_addr.s_addr = bcast_addr;
7706 sa.sin_port = 0;
7707 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7708 sizeof (struct sockaddr)),
7709 res);
7710
7711 /* IP address. */
7712 sa.sin_addr.s_addr = ip_addr;
7713 sa.sin_port = 0;
7714 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7715 sizeof (struct sockaddr)),
7716 res);
7717 }
7718 else
7719 res = Fcons (Qnil, Fcons (Qnil, res));
7720 }
7721 }
7722 /* GetAdaptersInfo is documented to not report loopback
7723 interfaces, so we generate one out of thin air. */
7724 if (!lo_count)
7725 {
7726 sa.sin_family = AF_INET;
7727 sa.sin_port = 0;
7728 if (NILP (ifname))
7729 {
7730 sa.sin_addr.s_addr = sys_inet_addr ("127.0.0.1");
7731 res = Fcons (Fcons (build_string ("lo"),
7732 conv_sockaddr_to_lisp ((struct sockaddr*) &sa,
7733 sizeof (struct sockaddr))),
7734 res);
7735 }
7736 else if (strcmp (SSDATA (ifname), "lo") == 0)
7737 {
7738 res = Fcons (Fcons (intern ("running"),
7739 Fcons (intern ("loopback"),
7740 Fcons (intern ("up"), Qnil))), Qnil);
7741 /* 772 is what 3 different GNU/Linux systems report for
7742 the loopback interface. */
7743 res = Fcons (Fcons (make_number (772),
7744 Fmake_vector (make_number (6),
7745 make_number (0))),
7746 res);
7747 sa.sin_addr.s_addr = sys_inet_addr ("255.0.0.0");
7748 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7749 sizeof (struct sockaddr)),
7750 res);
7751 sa.sin_addr.s_addr = sys_inet_addr ("0.0.0.0");
7752 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7753 sizeof (struct sockaddr)),
7754 res);
7755 sa.sin_addr.s_addr = sys_inet_addr ("127.0.0.1");
7756 res = Fcons (conv_sockaddr_to_lisp ((struct sockaddr *) &sa,
7757 sizeof (struct sockaddr)),
7758 res);
7759 }
7760
7761 }
7762 }
7763
7764 done:
7765 xfree (ainfo);
7766 return res;
7767}
7768
7769Lisp_Object
7770network_interface_list (void)
7771{
7772 return network_interface_get_info (Qnil);
7773}
7774
7775Lisp_Object
7776network_interface_info (Lisp_Object ifname)
7777{
7778 return network_interface_get_info (ifname);
7779}
7780
7781\f
7782/* The Windows CRT functions are "optimized for speed", so they don't
7783 check for timezone and DST changes if they were last called less
7784 than 1 minute ago (see http://support.microsoft.com/kb/821231). So
7785 all Emacs features that repeatedly call time functions (e.g.,
7786 display-time) are in real danger of missing timezone and DST
7787 changes. Calling tzset before each localtime call fixes that. */
7788struct tm *
7789sys_localtime (const time_t *t)
7790{
7791 tzset ();
7792 return localtime (t);
7793}
7794
7795
7796\f
7797/* Try loading LIBRARY_ID from the file(s) specified in
7798 Vdynamic_library_alist. If the library is loaded successfully,
7799 return the handle of the DLL, and record the filename in the
7800 property :loaded-from of LIBRARY_ID. If the library could not be
7801 found, or when it was already loaded (because the handle is not
7802 recorded anywhere, and so is lost after use), return NULL.
7803
7804 We could also save the handle in :loaded-from, but currently
7805 there's no use case for it. */
7806HMODULE
7807w32_delayed_load (Lisp_Object library_id)
7808{
7809 HMODULE library_dll = NULL;
7810
7811 CHECK_SYMBOL (library_id);
7812
7813 if (CONSP (Vdynamic_library_alist)
7814 && NILP (Fassq (library_id, Vlibrary_cache)))
7815 {
7816 Lisp_Object found = Qnil;
7817 Lisp_Object dlls = Fassq (library_id, Vdynamic_library_alist);
7818
7819 if (CONSP (dlls))
7820 for (dlls = XCDR (dlls); CONSP (dlls); dlls = XCDR (dlls))
7821 {
7822 CHECK_STRING_CAR (dlls);
7823 if ((library_dll = LoadLibrary (SDATA (XCAR (dlls)))))
7824 {
7825 char name[MAX_PATH];
7826 DWORD len;
7827
7828 len = GetModuleFileNameA (library_dll, name, sizeof (name));
7829 found = Fcons (XCAR (dlls),
7830 (len > 0)
7831 /* Possibly truncated */
7832 ? make_specified_string (name, -1, len, 1)
7833 : Qnil);
7834 break;
7835 }
7836 }
7837
7838 Fput (library_id, QCloaded_from, found);
7839 }
7840
7841 return library_dll;
7842}
7843
7844\f
7845void
7846check_windows_init_file (void)
7847{
7848 /* A common indication that Emacs is not installed properly is when
7849 it cannot find the Windows installation file. If this file does
7850 not exist in the expected place, tell the user. */
7851
7852 if (!noninteractive && !inhibit_window_system
7853 /* Vload_path is not yet initialized when we are loading
7854 loadup.el. */
7855 && NILP (Vpurify_flag))
7856 {
7857 Lisp_Object init_file;
7858 int fd;
7859
7860 init_file = build_string ("term/w32-win");
7861 fd = openp (Vload_path, init_file, Fget_load_suffixes (), NULL, Qnil);
7862 if (fd < 0)
7863 {
7864 Lisp_Object load_path_print = Fprin1_to_string (Vload_path, Qnil);
7865 char *init_file_name = SDATA (init_file);
7866 char *load_path = SDATA (load_path_print);
7867 char *buffer = alloca (1024
7868 + strlen (init_file_name)
7869 + strlen (load_path));
7870
7871 sprintf (buffer,
7872 "The Emacs Windows initialization file \"%s.el\" "
7873 "could not be found in your Emacs installation. "
7874 "Emacs checked the following directories for this file:\n"
7875 "\n%s\n\n"
7876 "When Emacs cannot find this file, it usually means that it "
7877 "was not installed properly, or its distribution file was "
7878 "not unpacked properly.\nSee the README.W32 file in the "
7879 "top-level Emacs directory for more information.",
7880 init_file_name, load_path);
7881 MessageBox (NULL,
7882 buffer,
7883 "Emacs Abort Dialog",
7884 MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
7885 /* Use the low-level system abort. */
7886 abort ();
7887 }
7888 else
7889 {
7890 _close (fd);
7891 }
7892 }
7893}
7894
7895void
7896term_ntproc (int ignored)
7897{
7898 (void)ignored;
7899
7900 term_timers ();
7901
7902 /* shutdown the socket interface if necessary */
7903 term_winsock ();
7904
7905 term_w32select ();
7906}
7907
7908void
7909init_ntproc (int dumping)
7910{
7911 sigset_t initial_mask = 0;
7912
7913 /* Initialize the socket interface now if available and requested by
7914 the user by defining PRELOAD_WINSOCK; otherwise loading will be
7915 delayed until open-network-stream is called (w32-has-winsock can
7916 also be used to dynamically load or reload winsock).
7917
7918 Conveniently, init_environment is called before us, so
7919 PRELOAD_WINSOCK can be set in the registry. */
7920
7921 /* Always initialize this correctly. */
7922 winsock_lib = NULL;
7923
7924 if (getenv ("PRELOAD_WINSOCK") != NULL)
7925 init_winsock (TRUE);
7926
7927 /* Initial preparation for subprocess support: replace our standard
7928 handles with non-inheritable versions. */
7929 {
7930 HANDLE parent;
7931 HANDLE stdin_save = INVALID_HANDLE_VALUE;
7932 HANDLE stdout_save = INVALID_HANDLE_VALUE;
7933 HANDLE stderr_save = INVALID_HANDLE_VALUE;
7934
7935 parent = GetCurrentProcess ();
7936
7937 /* ignore errors when duplicating and closing; typically the
7938 handles will be invalid when running as a gui program. */
7939 DuplicateHandle (parent,
7940 GetStdHandle (STD_INPUT_HANDLE),
7941 parent,
7942 &stdin_save,
7943 0,
7944 FALSE,
7945 DUPLICATE_SAME_ACCESS);
7946
7947 DuplicateHandle (parent,
7948 GetStdHandle (STD_OUTPUT_HANDLE),
7949 parent,
7950 &stdout_save,
7951 0,
7952 FALSE,
7953 DUPLICATE_SAME_ACCESS);
7954
7955 DuplicateHandle (parent,
7956 GetStdHandle (STD_ERROR_HANDLE),
7957 parent,
7958 &stderr_save,
7959 0,
7960 FALSE,
7961 DUPLICATE_SAME_ACCESS);
7962
7963 fclose (stdin);
7964 fclose (stdout);
7965 fclose (stderr);
7966
7967 if (stdin_save != INVALID_HANDLE_VALUE)
7968 _open_osfhandle ((intptr_t) stdin_save, O_TEXT);
7969 else
7970 _open ("nul", O_TEXT | O_NOINHERIT | O_RDONLY);
7971 _fdopen (0, "r");
7972
7973 if (stdout_save != INVALID_HANDLE_VALUE)
7974 _open_osfhandle ((intptr_t) stdout_save, O_TEXT);
7975 else
7976 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
7977 _fdopen (1, "w");
7978
7979 if (stderr_save != INVALID_HANDLE_VALUE)
7980 _open_osfhandle ((intptr_t) stderr_save, O_TEXT);
7981 else
7982 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
7983 _fdopen (2, "w");
7984 }
7985
7986 /* unfortunately, atexit depends on implementation of malloc */
7987 /* atexit (term_ntproc); */
7988 if (!dumping)
7989 {
7990 /* Make sure we start with all signals unblocked. */
7991 sigprocmask (SIG_SETMASK, &initial_mask, NULL);
7992 signal (SIGABRT, term_ntproc);
7993 }
7994 init_timers ();
7995
7996 /* determine which drives are fixed, for GetCachedVolumeInformation */
7997 {
7998 /* GetDriveType must have trailing backslash. */
7999 char drive[] = "A:\\";
8000
8001 /* Loop over all possible drive letters */
8002 while (*drive <= 'Z')
8003 {
8004 /* Record if this drive letter refers to a fixed drive. */
8005 fixed_drives[DRIVE_INDEX (*drive)] =
8006 (GetDriveType (drive) == DRIVE_FIXED);
8007
8008 (*drive)++;
8009 }
8010
8011 /* Reset the volume info cache. */
8012 volume_cache = NULL;
8013 }
8014}
8015
8016/*
8017 shutdown_handler ensures that buffers' autosave files are
8018 up to date when the user logs off, or the system shuts down.
8019*/
8020static BOOL WINAPI
8021shutdown_handler (DWORD type)
8022{
8023 /* Ctrl-C and Ctrl-Break are already suppressed, so don't handle them. */
8024 if (type == CTRL_CLOSE_EVENT /* User closes console window. */
8025 || type == CTRL_LOGOFF_EVENT /* User logs off. */
8026 || type == CTRL_SHUTDOWN_EVENT) /* User shutsdown. */
8027 {
8028 /* Shut down cleanly, making sure autosave files are up to date. */
8029 shut_down_emacs (0, Qnil);
8030 }
8031
8032 /* Allow other handlers to handle this signal. */
8033 return FALSE;
8034}
8035
8036/*
8037 globals_of_w32 is used to initialize those global variables that
8038 must always be initialized on startup even when the global variable
8039 initialized is non zero (see the function main in emacs.c).
8040*/
8041void
8042globals_of_w32 (void)
8043{
8044 HMODULE kernel32 = GetModuleHandle ("kernel32.dll");
8045
8046 get_process_times_fn = (GetProcessTimes_Proc)
8047 GetProcAddress (kernel32, "GetProcessTimes");
8048
8049 DEFSYM (QCloaded_from, ":loaded-from");
8050
8051 g_b_init_is_windows_9x = 0;
8052 g_b_init_open_process_token = 0;
8053 g_b_init_get_token_information = 0;
8054 g_b_init_lookup_account_sid = 0;
8055 g_b_init_get_sid_sub_authority = 0;
8056 g_b_init_get_sid_sub_authority_count = 0;
8057 g_b_init_get_security_info = 0;
8058 g_b_init_get_file_security = 0;
8059 g_b_init_get_security_descriptor_owner = 0;
8060 g_b_init_get_security_descriptor_group = 0;
8061 g_b_init_is_valid_sid = 0;
8062 g_b_init_create_toolhelp32_snapshot = 0;
8063 g_b_init_process32_first = 0;
8064 g_b_init_process32_next = 0;
8065 g_b_init_open_thread_token = 0;
8066 g_b_init_impersonate_self = 0;
8067 g_b_init_revert_to_self = 0;
8068 g_b_init_get_process_memory_info = 0;
8069 g_b_init_get_process_working_set_size = 0;
8070 g_b_init_global_memory_status = 0;
8071 g_b_init_global_memory_status_ex = 0;
8072 g_b_init_equal_sid = 0;
8073 g_b_init_copy_sid = 0;
8074 g_b_init_get_length_sid = 0;
8075 g_b_init_get_native_system_info = 0;
8076 g_b_init_get_system_times = 0;
8077 g_b_init_create_symbolic_link = 0;
8078 g_b_init_get_security_descriptor_dacl = 0;
8079 g_b_init_convert_sd_to_sddl = 0;
8080 g_b_init_convert_sddl_to_sd = 0;
8081 g_b_init_is_valid_security_descriptor = 0;
8082 g_b_init_set_file_security = 0;
8083 g_b_init_get_adapters_info = 0;
8084 num_of_processors = 0;
8085 /* The following sets a handler for shutdown notifications for
8086 console apps. This actually applies to Emacs in both console and
8087 GUI modes, since we had to fool windows into thinking emacs is a
8088 console application to get console mode to work. */
8089 SetConsoleCtrlHandler (shutdown_handler, TRUE);
8090
8091 /* "None" is the default group name on standalone workstations. */
8092 strcpy (dflt_group_name, "None");
8093
8094 /* Reset, in case it has some value inherited from dump time. */
8095 w32_stat_get_owner_group = 0;
8096
8097 /* If w32_unicode_filenames is non-zero, we will be using Unicode
8098 (a.k.a. "wide") APIs to invoke functions that accept file
8099 names. */
8100 if (is_windows_9x ())
8101 w32_unicode_filenames = 0;
8102 else
8103 w32_unicode_filenames = 1;
8104}
8105
8106/* For make-serial-process */
8107int
8108serial_open (Lisp_Object port_obj)
8109{
8110 char *port = SSDATA (port_obj);
8111 HANDLE hnd;
8112 child_process *cp;
8113 int fd = -1;
8114
8115 hnd = CreateFile (port, GENERIC_READ | GENERIC_WRITE, 0, 0,
8116 OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
8117 if (hnd == INVALID_HANDLE_VALUE)
8118 error ("Could not open %s", port);
8119 fd = (int) _open_osfhandle ((intptr_t) hnd, 0);
8120 if (fd == -1)
8121 error ("Could not open %s", port);
8122
8123 cp = new_child ();
8124 if (!cp)
8125 error ("Could not create child process");
8126 cp->fd = fd;
8127 cp->status = STATUS_READ_ACKNOWLEDGED;
8128 fd_info[ fd ].hnd = hnd;
8129 fd_info[ fd ].flags |=
8130 FILE_READ | FILE_WRITE | FILE_BINARY | FILE_SERIAL;
8131 if (fd_info[ fd ].cp != NULL)
8132 {
8133 error ("fd_info[fd = %d] is already in use", fd);
8134 }
8135 fd_info[ fd ].cp = cp;
8136 cp->ovl_read.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
8137 if (cp->ovl_read.hEvent == NULL)
8138 error ("Could not create read event");
8139 cp->ovl_write.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
8140 if (cp->ovl_write.hEvent == NULL)
8141 error ("Could not create write event");
8142
8143 return fd;
8144}
8145
8146/* For serial-process-configure */
8147void
8148serial_configure (struct Lisp_Process *p, Lisp_Object contact)
8149{
8150 Lisp_Object childp2 = Qnil;
8151 Lisp_Object tem = Qnil;
8152 HANDLE hnd;
8153 DCB dcb;
8154 COMMTIMEOUTS ct;
8155 char summary[4] = "???"; /* This usually becomes "8N1". */
8156
8157 if ((fd_info[ p->outfd ].flags & FILE_SERIAL) == 0)
8158 error ("Not a serial process");
8159 hnd = fd_info[ p->outfd ].hnd;
8160
8161 childp2 = Fcopy_sequence (p->childp);
8162
8163 /* Initialize timeouts for blocking read and blocking write. */
8164 if (!GetCommTimeouts (hnd, &ct))
8165 error ("GetCommTimeouts() failed");
8166 ct.ReadIntervalTimeout = 0;
8167 ct.ReadTotalTimeoutMultiplier = 0;
8168 ct.ReadTotalTimeoutConstant = 0;
8169 ct.WriteTotalTimeoutMultiplier = 0;
8170 ct.WriteTotalTimeoutConstant = 0;
8171 if (!SetCommTimeouts (hnd, &ct))
8172 error ("SetCommTimeouts() failed");
8173 /* Read port attributes and prepare default configuration. */
8174 memset (&dcb, 0, sizeof (dcb));
8175 dcb.DCBlength = sizeof (DCB);
8176 if (!GetCommState (hnd, &dcb))
8177 error ("GetCommState() failed");
8178 dcb.fBinary = TRUE;
8179 dcb.fNull = FALSE;
8180 dcb.fAbortOnError = FALSE;
8181 /* dcb.XonLim and dcb.XoffLim are set by GetCommState() */
8182 dcb.ErrorChar = 0;
8183 dcb.EofChar = 0;
8184 dcb.EvtChar = 0;
8185
8186 /* Configure speed. */
8187 if (!NILP (Fplist_member (contact, QCspeed)))
8188 tem = Fplist_get (contact, QCspeed);
8189 else
8190 tem = Fplist_get (p->childp, QCspeed);
8191 CHECK_NUMBER (tem);
8192 dcb.BaudRate = XINT (tem);
8193 childp2 = Fplist_put (childp2, QCspeed, tem);
8194
8195 /* Configure bytesize. */
8196 if (!NILP (Fplist_member (contact, QCbytesize)))
8197 tem = Fplist_get (contact, QCbytesize);
8198 else
8199 tem = Fplist_get (p->childp, QCbytesize);
8200 if (NILP (tem))
8201 tem = make_number (8);
8202 CHECK_NUMBER (tem);
8203 if (XINT (tem) != 7 && XINT (tem) != 8)
8204 error (":bytesize must be nil (8), 7, or 8");
8205 dcb.ByteSize = XINT (tem);
8206 summary[0] = XINT (tem) + '0';
8207 childp2 = Fplist_put (childp2, QCbytesize, tem);
8208
8209 /* Configure parity. */
8210 if (!NILP (Fplist_member (contact, QCparity)))
8211 tem = Fplist_get (contact, QCparity);
8212 else
8213 tem = Fplist_get (p->childp, QCparity);
8214 if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
8215 error (":parity must be nil (no parity), `even', or `odd'");
8216 dcb.fParity = FALSE;
8217 dcb.Parity = NOPARITY;
8218 dcb.fErrorChar = FALSE;
8219 if (NILP (tem))
8220 {
8221 summary[1] = 'N';
8222 }
8223 else if (EQ (tem, Qeven))
8224 {
8225 summary[1] = 'E';
8226 dcb.fParity = TRUE;
8227 dcb.Parity = EVENPARITY;
8228 dcb.fErrorChar = TRUE;
8229 }
8230 else if (EQ (tem, Qodd))
8231 {
8232 summary[1] = 'O';
8233 dcb.fParity = TRUE;
8234 dcb.Parity = ODDPARITY;
8235 dcb.fErrorChar = TRUE;
8236 }
8237 childp2 = Fplist_put (childp2, QCparity, tem);
8238
8239 /* Configure stopbits. */
8240 if (!NILP (Fplist_member (contact, QCstopbits)))
8241 tem = Fplist_get (contact, QCstopbits);
8242 else
8243 tem = Fplist_get (p->childp, QCstopbits);
8244 if (NILP (tem))
8245 tem = make_number (1);
8246 CHECK_NUMBER (tem);
8247 if (XINT (tem) != 1 && XINT (tem) != 2)
8248 error (":stopbits must be nil (1 stopbit), 1, or 2");
8249 summary[2] = XINT (tem) + '0';
8250 if (XINT (tem) == 1)
8251 dcb.StopBits = ONESTOPBIT;
8252 else if (XINT (tem) == 2)
8253 dcb.StopBits = TWOSTOPBITS;
8254 childp2 = Fplist_put (childp2, QCstopbits, tem);
8255
8256 /* Configure flowcontrol. */
8257 if (!NILP (Fplist_member (contact, QCflowcontrol)))
8258 tem = Fplist_get (contact, QCflowcontrol);
8259 else
8260 tem = Fplist_get (p->childp, QCflowcontrol);
8261 if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
8262 error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
8263 dcb.fOutxCtsFlow = FALSE;
8264 dcb.fOutxDsrFlow = FALSE;
8265 dcb.fDtrControl = DTR_CONTROL_DISABLE;
8266 dcb.fDsrSensitivity = FALSE;
8267 dcb.fTXContinueOnXoff = FALSE;
8268 dcb.fOutX = FALSE;
8269 dcb.fInX = FALSE;
8270 dcb.fRtsControl = RTS_CONTROL_DISABLE;
8271 dcb.XonChar = 17; /* Control-Q */
8272 dcb.XoffChar = 19; /* Control-S */
8273 if (NILP (tem))
8274 {
8275 /* Already configured. */
8276 }
8277 else if (EQ (tem, Qhw))
8278 {
8279 dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
8280 dcb.fOutxCtsFlow = TRUE;
8281 }
8282 else if (EQ (tem, Qsw))
8283 {
8284 dcb.fOutX = TRUE;
8285 dcb.fInX = TRUE;
8286 }
8287 childp2 = Fplist_put (childp2, QCflowcontrol, tem);
8288
8289 /* Activate configuration. */
8290 if (!SetCommState (hnd, &dcb))
8291 error ("SetCommState() failed");
8292
8293 childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
8294 pset_childp (p, childp2);
8295}
8296
8297#ifdef HAVE_GNUTLS
8298
8299ssize_t
8300emacs_gnutls_pull (gnutls_transport_ptr_t p, void* buf, size_t sz)
8301{
8302 int n, err;
8303 SELECT_TYPE fdset;
8304 struct timespec timeout;
8305 struct Lisp_Process *process = (struct Lisp_Process *)p;
8306 int fd = process->infd;
8307
8308 n = sys_read (fd, (char*)buf, sz);
8309
8310 if (n >= 0)
8311 return n;
8312
8313 err = errno;
8314
8315 /* Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
8316 if (err == EWOULDBLOCK)
8317 err = EAGAIN;
8318
8319 emacs_gnutls_transport_set_errno (process->gnutls_state, err);
8320
8321 return -1;
8322}
8323
8324ssize_t
8325emacs_gnutls_push (gnutls_transport_ptr_t p, const void* buf, size_t sz)
8326{
8327 struct Lisp_Process *process = (struct Lisp_Process *)p;
8328 int fd = process->outfd;
8329 ssize_t n = sys_write (fd, buf, sz);
8330
8331 /* 0 or more bytes written means everything went fine. */
8332 if (n >= 0)
8333 return n;
8334
8335 /* Negative bytes written means we got an error in errno.
8336 Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
8337 emacs_gnutls_transport_set_errno (process->gnutls_state,
8338 errno == EWOULDBLOCK ? EAGAIN : errno);
8339
8340 return -1;
8341}
8342#endif /* HAVE_GNUTLS */
8343
8344/* end of w32.c */
Unnamed repository; edit this file 'description' to name the repository.