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* src/keyboard.c (input-decode-map, key-translation-map): Doc fixes.
[gnu-emacs] / src / w32.c
1 /* Utility and Unix shadow routines for GNU Emacs on the Microsoft Windows API.
2 Copyright (C) 1994-1995, 2000-2013 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
18
19 /*
20 Geoff Voelker (voelker@cs.washington.edu) 7-29-94
21 */
22 #include <stddef.h> /* for offsetof */
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <float.h> /* for DBL_EPSILON */
26 #include <io.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <ctype.h>
30 #include <signal.h>
31 #include <sys/file.h>
32 #include <sys/time.h>
33 #include <sys/utime.h>
34 #include <math.h>
35 #include <time.h>
36
37 /* must include CRT headers *before* config.h */
38
39 #include <config.h>
40 #include <mbstring.h> /* for _mbspbrk, _mbslwr, _mbsrchr, ... */
41
42 #undef access
43 #undef chdir
44 #undef chmod
45 #undef creat
46 #undef ctime
47 #undef fopen
48 #undef link
49 #undef mkdir
50 #undef mktemp
51 #undef open
52 #undef rename
53 #undef rmdir
54 #undef unlink
55
56 #undef close
57 #undef dup
58 #undef dup2
59 #undef pipe
60 #undef read
61 #undef write
62
63 #undef strerror
64
65 #undef localtime
66
67 #include "lisp.h"
68
69 #include <pwd.h>
70 #include <grp.h>
71
72 #ifdef __GNUC__
73 #define _ANONYMOUS_UNION
74 #define _ANONYMOUS_STRUCT
75 #endif
76 #include <windows.h>
77 /* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
78 use a different name to avoid compilation problems. */
79 typedef struct _MEMORY_STATUS_EX {
80 DWORD dwLength;
81 DWORD dwMemoryLoad;
82 DWORDLONG ullTotalPhys;
83 DWORDLONG ullAvailPhys;
84 DWORDLONG ullTotalPageFile;
85 DWORDLONG ullAvailPageFile;
86 DWORDLONG ullTotalVirtual;
87 DWORDLONG ullAvailVirtual;
88 DWORDLONG ullAvailExtendedVirtual;
89 } MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
90
91 #include <lmcons.h>
92 #include <shlobj.h>
93
94 #include <tlhelp32.h>
95 #include <psapi.h>
96 #ifndef _MSC_VER
97 #include <w32api.h>
98 #endif
99 #if !defined (__MINGW32__) || __W32API_MAJOR_VERSION < 3 || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 15)
100 /* This either is not in psapi.h or guarded by higher value of
101 _WIN32_WINNT than what we use. w32api supplied with MinGW 3.15
102 defines it in psapi.h */
103 typedef struct _PROCESS_MEMORY_COUNTERS_EX {
104 DWORD cb;
105 DWORD PageFaultCount;
106 SIZE_T PeakWorkingSetSize;
107 SIZE_T WorkingSetSize;
108 SIZE_T QuotaPeakPagedPoolUsage;
109 SIZE_T QuotaPagedPoolUsage;
110 SIZE_T QuotaPeakNonPagedPoolUsage;
111 SIZE_T QuotaNonPagedPoolUsage;
112 SIZE_T PagefileUsage;
113 SIZE_T PeakPagefileUsage;
114 SIZE_T PrivateUsage;
115 } PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;
116 #endif
117
118 #include <winioctl.h>
119 #include <aclapi.h>
120
121 #ifdef _MSC_VER
122 /* MSVC doesn't provide the definition of REPARSE_DATA_BUFFER and the
123 associated macros, except on ntifs.h, which cannot be included
124 because it triggers conflicts with other Windows API headers. So
125 we define it here by hand. */
126
127 typedef struct _REPARSE_DATA_BUFFER {
128 ULONG ReparseTag;
129 USHORT ReparseDataLength;
130 USHORT Reserved;
131 union {
132 struct {
133 USHORT SubstituteNameOffset;
134 USHORT SubstituteNameLength;
135 USHORT PrintNameOffset;
136 USHORT PrintNameLength;
137 ULONG Flags;
138 WCHAR PathBuffer[1];
139 } SymbolicLinkReparseBuffer;
140 struct {
141 USHORT SubstituteNameOffset;
142 USHORT SubstituteNameLength;
143 USHORT PrintNameOffset;
144 USHORT PrintNameLength;
145 WCHAR PathBuffer[1];
146 } MountPointReparseBuffer;
147 struct {
148 UCHAR DataBuffer[1];
149 } GenericReparseBuffer;
150 } DUMMYUNIONNAME;
151 } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
152
153 #ifndef FILE_DEVICE_FILE_SYSTEM
154 #define FILE_DEVICE_FILE_SYSTEM 9
155 #endif
156 #ifndef METHOD_BUFFERED
157 #define METHOD_BUFFERED 0
158 #endif
159 #ifndef FILE_ANY_ACCESS
160 #define FILE_ANY_ACCESS 0x00000000
161 #endif
162 #ifndef CTL_CODE
163 #define CTL_CODE(t,f,m,a) (((t)<<16)|((a)<<14)|((f)<<2)|(m))
164 #endif
165 #define FSCTL_GET_REPARSE_POINT \
166 CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 42, METHOD_BUFFERED, FILE_ANY_ACCESS)
167 #endif
168
169 /* TCP connection support. */
170 #include <sys/socket.h>
171 #undef socket
172 #undef bind
173 #undef connect
174 #undef htons
175 #undef ntohs
176 #undef inet_addr
177 #undef gethostname
178 #undef gethostbyname
179 #undef getservbyname
180 #undef getpeername
181 #undef shutdown
182 #undef setsockopt
183 #undef listen
184 #undef getsockname
185 #undef accept
186 #undef recvfrom
187 #undef sendto
188
189 #include "w32.h"
190 #include "ndir.h"
191 #include "w32common.h"
192 #include "w32heap.h"
193 #include "w32select.h"
194 #include "systime.h"
195 #include "dispextern.h" /* for xstrcasecmp */
196 #include "coding.h" /* for Vlocale_coding_system */
197
198 #include "careadlinkat.h"
199 #include "allocator.h"
200
201 /* For serial_configure and serial_open. */
202 #include "process.h"
203
204 typedef HRESULT (WINAPI * ShGetFolderPath_fn)
205 (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);
206
207 Lisp_Object QCloaded_from;
208
209 void globals_of_w32 (void);
210 static DWORD get_rid (PSID);
211 static int is_symlink (const char *);
212 static char * chase_symlinks (const char *);
213 static int enable_privilege (LPCTSTR, BOOL, TOKEN_PRIVILEGES *);
214 static int restore_privilege (TOKEN_PRIVILEGES *);
215 static BOOL WINAPI revert_to_self (void);
216
217 extern int sys_access (const char *, int);
218 extern void *e_malloc (size_t);
219 extern int sys_select (int, SELECT_TYPE *, SELECT_TYPE *, SELECT_TYPE *,
220 EMACS_TIME *, void *);
221
222
223 \f
224 /* Initialization states.
225
226 WARNING: If you add any more such variables for additional APIs,
227 you MUST add initialization for them to globals_of_w32
228 below. This is because these variables might get set
229 to non-NULL values during dumping, but the dumped Emacs
230 cannot reuse those values, because it could be run on a
231 different version of the OS, where API addresses are
232 different. */
233 static BOOL g_b_init_is_windows_9x;
234 static BOOL g_b_init_open_process_token;
235 static BOOL g_b_init_get_token_information;
236 static BOOL g_b_init_lookup_account_sid;
237 static BOOL g_b_init_get_sid_sub_authority;
238 static BOOL g_b_init_get_sid_sub_authority_count;
239 static BOOL g_b_init_get_security_info;
240 static BOOL g_b_init_get_file_security;
241 static BOOL g_b_init_get_security_descriptor_owner;
242 static BOOL g_b_init_get_security_descriptor_group;
243 static BOOL g_b_init_is_valid_sid;
244 static BOOL g_b_init_create_toolhelp32_snapshot;
245 static BOOL g_b_init_process32_first;
246 static BOOL g_b_init_process32_next;
247 static BOOL g_b_init_open_thread_token;
248 static BOOL g_b_init_impersonate_self;
249 static BOOL g_b_init_revert_to_self;
250 static BOOL g_b_init_get_process_memory_info;
251 static BOOL g_b_init_get_process_working_set_size;
252 static BOOL g_b_init_global_memory_status;
253 static BOOL g_b_init_global_memory_status_ex;
254 static BOOL g_b_init_get_length_sid;
255 static BOOL g_b_init_equal_sid;
256 static BOOL g_b_init_copy_sid;
257 static BOOL g_b_init_get_native_system_info;
258 static BOOL g_b_init_get_system_times;
259 static BOOL g_b_init_create_symbolic_link;
260
261 /*
262 BEGIN: Wrapper functions around OpenProcessToken
263 and other functions in advapi32.dll that are only
264 supported in Windows NT / 2k / XP
265 */
266 /* ** Function pointer typedefs ** */
267 typedef BOOL (WINAPI * OpenProcessToken_Proc) (
268 HANDLE ProcessHandle,
269 DWORD DesiredAccess,
270 PHANDLE TokenHandle);
271 typedef BOOL (WINAPI * GetTokenInformation_Proc) (
272 HANDLE TokenHandle,
273 TOKEN_INFORMATION_CLASS TokenInformationClass,
274 LPVOID TokenInformation,
275 DWORD TokenInformationLength,
276 PDWORD ReturnLength);
277 typedef BOOL (WINAPI * GetProcessTimes_Proc) (
278 HANDLE process_handle,
279 LPFILETIME creation_time,
280 LPFILETIME exit_time,
281 LPFILETIME kernel_time,
282 LPFILETIME user_time);
283
284 GetProcessTimes_Proc get_process_times_fn = NULL;
285
286 #ifdef _UNICODE
287 const char * const LookupAccountSid_Name = "LookupAccountSidW";
288 const char * const GetFileSecurity_Name = "GetFileSecurityW";
289 #else
290 const char * const LookupAccountSid_Name = "LookupAccountSidA";
291 const char * const GetFileSecurity_Name = "GetFileSecurityA";
292 #endif
293 typedef BOOL (WINAPI * LookupAccountSid_Proc) (
294 LPCTSTR lpSystemName,
295 PSID Sid,
296 LPTSTR Name,
297 LPDWORD cbName,
298 LPTSTR DomainName,
299 LPDWORD cbDomainName,
300 PSID_NAME_USE peUse);
301 typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
302 PSID pSid,
303 DWORD n);
304 typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
305 PSID pSid);
306 typedef DWORD (WINAPI * GetSecurityInfo_Proc) (
307 HANDLE handle,
308 SE_OBJECT_TYPE ObjectType,
309 SECURITY_INFORMATION SecurityInfo,
310 PSID *ppsidOwner,
311 PSID *ppsidGroup,
312 PACL *ppDacl,
313 PACL *ppSacl,
314 PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
315 typedef BOOL (WINAPI * GetFileSecurity_Proc) (
316 LPCTSTR lpFileName,
317 SECURITY_INFORMATION RequestedInformation,
318 PSECURITY_DESCRIPTOR pSecurityDescriptor,
319 DWORD nLength,
320 LPDWORD lpnLengthNeeded);
321 typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
322 PSECURITY_DESCRIPTOR pSecurityDescriptor,
323 PSID *pOwner,
324 LPBOOL lpbOwnerDefaulted);
325 typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
326 PSECURITY_DESCRIPTOR pSecurityDescriptor,
327 PSID *pGroup,
328 LPBOOL lpbGroupDefaulted);
329 typedef BOOL (WINAPI * IsValidSid_Proc) (
330 PSID sid);
331 typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
332 DWORD dwFlags,
333 DWORD th32ProcessID);
334 typedef BOOL (WINAPI * Process32First_Proc) (
335 HANDLE hSnapshot,
336 LPPROCESSENTRY32 lppe);
337 typedef BOOL (WINAPI * Process32Next_Proc) (
338 HANDLE hSnapshot,
339 LPPROCESSENTRY32 lppe);
340 typedef BOOL (WINAPI * OpenThreadToken_Proc) (
341 HANDLE ThreadHandle,
342 DWORD DesiredAccess,
343 BOOL OpenAsSelf,
344 PHANDLE TokenHandle);
345 typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
346 SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
347 typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
348 typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
349 HANDLE Process,
350 PPROCESS_MEMORY_COUNTERS ppsmemCounters,
351 DWORD cb);
352 typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
353 HANDLE hProcess,
354 PSIZE_T lpMinimumWorkingSetSize,
355 PSIZE_T lpMaximumWorkingSetSize);
356 typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
357 LPMEMORYSTATUS lpBuffer);
358 typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
359 LPMEMORY_STATUS_EX lpBuffer);
360 typedef BOOL (WINAPI * CopySid_Proc) (
361 DWORD nDestinationSidLength,
362 PSID pDestinationSid,
363 PSID pSourceSid);
364 typedef BOOL (WINAPI * EqualSid_Proc) (
365 PSID pSid1,
366 PSID pSid2);
367 typedef DWORD (WINAPI * GetLengthSid_Proc) (
368 PSID pSid);
369 typedef void (WINAPI * GetNativeSystemInfo_Proc) (
370 LPSYSTEM_INFO lpSystemInfo);
371 typedef BOOL (WINAPI * GetSystemTimes_Proc) (
372 LPFILETIME lpIdleTime,
373 LPFILETIME lpKernelTime,
374 LPFILETIME lpUserTime);
375 typedef BOOLEAN (WINAPI *CreateSymbolicLink_Proc) (
376 LPTSTR lpSymlinkFileName,
377 LPTSTR lpTargetFileName,
378 DWORD dwFlags);
379
380 /* ** A utility function ** */
381 static BOOL
382 is_windows_9x (void)
383 {
384 static BOOL s_b_ret = 0;
385 OSVERSIONINFO os_ver;
386 if (g_b_init_is_windows_9x == 0)
387 {
388 g_b_init_is_windows_9x = 1;
389 ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
390 os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
391 if (GetVersionEx (&os_ver))
392 {
393 s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
394 }
395 }
396 return s_b_ret;
397 }
398
399 static Lisp_Object ltime (ULONGLONG);
400
401 /* Get total user and system times for get-internal-run-time.
402 Returns a list of integers if the times are provided by the OS
403 (NT derivatives), otherwise it returns the result of current-time. */
404 Lisp_Object
405 w32_get_internal_run_time (void)
406 {
407 if (get_process_times_fn)
408 {
409 FILETIME create, exit, kernel, user;
410 HANDLE proc = GetCurrentProcess ();
411 if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
412 {
413 LARGE_INTEGER user_int, kernel_int, total;
414 user_int.LowPart = user.dwLowDateTime;
415 user_int.HighPart = user.dwHighDateTime;
416 kernel_int.LowPart = kernel.dwLowDateTime;
417 kernel_int.HighPart = kernel.dwHighDateTime;
418 total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
419 return ltime (total.QuadPart);
420 }
421 }
422
423 return Fcurrent_time ();
424 }
425
426 /* ** The wrapper functions ** */
427
428 static BOOL WINAPI
429 open_process_token (HANDLE ProcessHandle,
430 DWORD DesiredAccess,
431 PHANDLE TokenHandle)
432 {
433 static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
434 HMODULE hm_advapi32 = NULL;
435 if (is_windows_9x () == TRUE)
436 {
437 return FALSE;
438 }
439 if (g_b_init_open_process_token == 0)
440 {
441 g_b_init_open_process_token = 1;
442 hm_advapi32 = LoadLibrary ("Advapi32.dll");
443 s_pfn_Open_Process_Token =
444 (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
445 }
446 if (s_pfn_Open_Process_Token == NULL)
447 {
448 return FALSE;
449 }
450 return (
451 s_pfn_Open_Process_Token (
452 ProcessHandle,
453 DesiredAccess,
454 TokenHandle)
455 );
456 }
457
458 static BOOL WINAPI
459 get_token_information (HANDLE TokenHandle,
460 TOKEN_INFORMATION_CLASS TokenInformationClass,
461 LPVOID TokenInformation,
462 DWORD TokenInformationLength,
463 PDWORD ReturnLength)
464 {
465 static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
466 HMODULE hm_advapi32 = NULL;
467 if (is_windows_9x () == TRUE)
468 {
469 return FALSE;
470 }
471 if (g_b_init_get_token_information == 0)
472 {
473 g_b_init_get_token_information = 1;
474 hm_advapi32 = LoadLibrary ("Advapi32.dll");
475 s_pfn_Get_Token_Information =
476 (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
477 }
478 if (s_pfn_Get_Token_Information == NULL)
479 {
480 return FALSE;
481 }
482 return (
483 s_pfn_Get_Token_Information (
484 TokenHandle,
485 TokenInformationClass,
486 TokenInformation,
487 TokenInformationLength,
488 ReturnLength)
489 );
490 }
491
492 static BOOL WINAPI
493 lookup_account_sid (LPCTSTR lpSystemName,
494 PSID Sid,
495 LPTSTR Name,
496 LPDWORD cbName,
497 LPTSTR DomainName,
498 LPDWORD cbDomainName,
499 PSID_NAME_USE peUse)
500 {
501 static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
502 HMODULE hm_advapi32 = NULL;
503 if (is_windows_9x () == TRUE)
504 {
505 return FALSE;
506 }
507 if (g_b_init_lookup_account_sid == 0)
508 {
509 g_b_init_lookup_account_sid = 1;
510 hm_advapi32 = LoadLibrary ("Advapi32.dll");
511 s_pfn_Lookup_Account_Sid =
512 (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
513 }
514 if (s_pfn_Lookup_Account_Sid == NULL)
515 {
516 return FALSE;
517 }
518 return (
519 s_pfn_Lookup_Account_Sid (
520 lpSystemName,
521 Sid,
522 Name,
523 cbName,
524 DomainName,
525 cbDomainName,
526 peUse)
527 );
528 }
529
530 static PDWORD WINAPI
531 get_sid_sub_authority (PSID pSid, DWORD n)
532 {
533 static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
534 static DWORD zero = 0U;
535 HMODULE hm_advapi32 = NULL;
536 if (is_windows_9x () == TRUE)
537 {
538 return &zero;
539 }
540 if (g_b_init_get_sid_sub_authority == 0)
541 {
542 g_b_init_get_sid_sub_authority = 1;
543 hm_advapi32 = LoadLibrary ("Advapi32.dll");
544 s_pfn_Get_Sid_Sub_Authority =
545 (GetSidSubAuthority_Proc) GetProcAddress (
546 hm_advapi32, "GetSidSubAuthority");
547 }
548 if (s_pfn_Get_Sid_Sub_Authority == NULL)
549 {
550 return &zero;
551 }
552 return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
553 }
554
555 static PUCHAR WINAPI
556 get_sid_sub_authority_count (PSID pSid)
557 {
558 static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
559 static UCHAR zero = 0U;
560 HMODULE hm_advapi32 = NULL;
561 if (is_windows_9x () == TRUE)
562 {
563 return &zero;
564 }
565 if (g_b_init_get_sid_sub_authority_count == 0)
566 {
567 g_b_init_get_sid_sub_authority_count = 1;
568 hm_advapi32 = LoadLibrary ("Advapi32.dll");
569 s_pfn_Get_Sid_Sub_Authority_Count =
570 (GetSidSubAuthorityCount_Proc) GetProcAddress (
571 hm_advapi32, "GetSidSubAuthorityCount");
572 }
573 if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
574 {
575 return &zero;
576 }
577 return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
578 }
579
580 static DWORD WINAPI
581 get_security_info (HANDLE handle,
582 SE_OBJECT_TYPE ObjectType,
583 SECURITY_INFORMATION SecurityInfo,
584 PSID *ppsidOwner,
585 PSID *ppsidGroup,
586 PACL *ppDacl,
587 PACL *ppSacl,
588 PSECURITY_DESCRIPTOR *ppSecurityDescriptor)
589 {
590 static GetSecurityInfo_Proc s_pfn_Get_Security_Info = NULL;
591 HMODULE hm_advapi32 = NULL;
592 if (is_windows_9x () == TRUE)
593 {
594 return FALSE;
595 }
596 if (g_b_init_get_security_info == 0)
597 {
598 g_b_init_get_security_info = 1;
599 hm_advapi32 = LoadLibrary ("Advapi32.dll");
600 s_pfn_Get_Security_Info =
601 (GetSecurityInfo_Proc) GetProcAddress (
602 hm_advapi32, "GetSecurityInfo");
603 }
604 if (s_pfn_Get_Security_Info == NULL)
605 {
606 return FALSE;
607 }
608 return (s_pfn_Get_Security_Info (handle, ObjectType, SecurityInfo,
609 ppsidOwner, ppsidGroup, ppDacl, ppSacl,
610 ppSecurityDescriptor));
611 }
612
613 static BOOL WINAPI
614 get_file_security (LPCTSTR lpFileName,
615 SECURITY_INFORMATION RequestedInformation,
616 PSECURITY_DESCRIPTOR pSecurityDescriptor,
617 DWORD nLength,
618 LPDWORD lpnLengthNeeded)
619 {
620 static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
621 HMODULE hm_advapi32 = NULL;
622 if (is_windows_9x () == TRUE)
623 {
624 return FALSE;
625 }
626 if (g_b_init_get_file_security == 0)
627 {
628 g_b_init_get_file_security = 1;
629 hm_advapi32 = LoadLibrary ("Advapi32.dll");
630 s_pfn_Get_File_Security =
631 (GetFileSecurity_Proc) GetProcAddress (
632 hm_advapi32, GetFileSecurity_Name);
633 }
634 if (s_pfn_Get_File_Security == NULL)
635 {
636 return FALSE;
637 }
638 return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
639 pSecurityDescriptor, nLength,
640 lpnLengthNeeded));
641 }
642
643 static BOOL WINAPI
644 get_security_descriptor_owner (PSECURITY_DESCRIPTOR pSecurityDescriptor,
645 PSID *pOwner,
646 LPBOOL lpbOwnerDefaulted)
647 {
648 static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
649 HMODULE hm_advapi32 = NULL;
650 if (is_windows_9x () == TRUE)
651 {
652 return FALSE;
653 }
654 if (g_b_init_get_security_descriptor_owner == 0)
655 {
656 g_b_init_get_security_descriptor_owner = 1;
657 hm_advapi32 = LoadLibrary ("Advapi32.dll");
658 s_pfn_Get_Security_Descriptor_Owner =
659 (GetSecurityDescriptorOwner_Proc) GetProcAddress (
660 hm_advapi32, "GetSecurityDescriptorOwner");
661 }
662 if (s_pfn_Get_Security_Descriptor_Owner == NULL)
663 {
664 return FALSE;
665 }
666 return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
667 lpbOwnerDefaulted));
668 }
669
670 static BOOL WINAPI
671 get_security_descriptor_group (PSECURITY_DESCRIPTOR pSecurityDescriptor,
672 PSID *pGroup,
673 LPBOOL lpbGroupDefaulted)
674 {
675 static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
676 HMODULE hm_advapi32 = NULL;
677 if (is_windows_9x () == TRUE)
678 {
679 return FALSE;
680 }
681 if (g_b_init_get_security_descriptor_group == 0)
682 {
683 g_b_init_get_security_descriptor_group = 1;
684 hm_advapi32 = LoadLibrary ("Advapi32.dll");
685 s_pfn_Get_Security_Descriptor_Group =
686 (GetSecurityDescriptorGroup_Proc) GetProcAddress (
687 hm_advapi32, "GetSecurityDescriptorGroup");
688 }
689 if (s_pfn_Get_Security_Descriptor_Group == NULL)
690 {
691 return FALSE;
692 }
693 return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
694 lpbGroupDefaulted));
695 }
696
697 static BOOL WINAPI
698 is_valid_sid (PSID sid)
699 {
700 static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
701 HMODULE hm_advapi32 = NULL;
702 if (is_windows_9x () == TRUE)
703 {
704 return FALSE;
705 }
706 if (g_b_init_is_valid_sid == 0)
707 {
708 g_b_init_is_valid_sid = 1;
709 hm_advapi32 = LoadLibrary ("Advapi32.dll");
710 s_pfn_Is_Valid_Sid =
711 (IsValidSid_Proc) GetProcAddress (
712 hm_advapi32, "IsValidSid");
713 }
714 if (s_pfn_Is_Valid_Sid == NULL)
715 {
716 return FALSE;
717 }
718 return (s_pfn_Is_Valid_Sid (sid));
719 }
720
721 static BOOL WINAPI
722 equal_sid (PSID sid1, PSID sid2)
723 {
724 static EqualSid_Proc s_pfn_Equal_Sid = NULL;
725 HMODULE hm_advapi32 = NULL;
726 if (is_windows_9x () == TRUE)
727 {
728 return FALSE;
729 }
730 if (g_b_init_equal_sid == 0)
731 {
732 g_b_init_equal_sid = 1;
733 hm_advapi32 = LoadLibrary ("Advapi32.dll");
734 s_pfn_Equal_Sid =
735 (EqualSid_Proc) GetProcAddress (
736 hm_advapi32, "EqualSid");
737 }
738 if (s_pfn_Equal_Sid == NULL)
739 {
740 return FALSE;
741 }
742 return (s_pfn_Equal_Sid (sid1, sid2));
743 }
744
745 static DWORD WINAPI
746 get_length_sid (PSID sid)
747 {
748 static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
749 HMODULE hm_advapi32 = NULL;
750 if (is_windows_9x () == TRUE)
751 {
752 return 0;
753 }
754 if (g_b_init_get_length_sid == 0)
755 {
756 g_b_init_get_length_sid = 1;
757 hm_advapi32 = LoadLibrary ("Advapi32.dll");
758 s_pfn_Get_Length_Sid =
759 (GetLengthSid_Proc) GetProcAddress (
760 hm_advapi32, "GetLengthSid");
761 }
762 if (s_pfn_Get_Length_Sid == NULL)
763 {
764 return 0;
765 }
766 return (s_pfn_Get_Length_Sid (sid));
767 }
768
769 static BOOL WINAPI
770 copy_sid (DWORD destlen, PSID dest, PSID src)
771 {
772 static CopySid_Proc s_pfn_Copy_Sid = NULL;
773 HMODULE hm_advapi32 = NULL;
774 if (is_windows_9x () == TRUE)
775 {
776 return FALSE;
777 }
778 if (g_b_init_copy_sid == 0)
779 {
780 g_b_init_copy_sid = 1;
781 hm_advapi32 = LoadLibrary ("Advapi32.dll");
782 s_pfn_Copy_Sid =
783 (CopySid_Proc) GetProcAddress (
784 hm_advapi32, "CopySid");
785 }
786 if (s_pfn_Copy_Sid == NULL)
787 {
788 return FALSE;
789 }
790 return (s_pfn_Copy_Sid (destlen, dest, src));
791 }
792
793 /*
794 END: Wrapper functions around OpenProcessToken
795 and other functions in advapi32.dll that are only
796 supported in Windows NT / 2k / XP
797 */
798
799 static void WINAPI
800 get_native_system_info (LPSYSTEM_INFO lpSystemInfo)
801 {
802 static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
803 if (is_windows_9x () != TRUE)
804 {
805 if (g_b_init_get_native_system_info == 0)
806 {
807 g_b_init_get_native_system_info = 1;
808 s_pfn_Get_Native_System_Info =
809 (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
810 "GetNativeSystemInfo");
811 }
812 if (s_pfn_Get_Native_System_Info != NULL)
813 s_pfn_Get_Native_System_Info (lpSystemInfo);
814 }
815 else
816 lpSystemInfo->dwNumberOfProcessors = -1;
817 }
818
819 static BOOL WINAPI
820 get_system_times (LPFILETIME lpIdleTime,
821 LPFILETIME lpKernelTime,
822 LPFILETIME lpUserTime)
823 {
824 static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
825 if (is_windows_9x () == TRUE)
826 {
827 return FALSE;
828 }
829 if (g_b_init_get_system_times == 0)
830 {
831 g_b_init_get_system_times = 1;
832 s_pfn_Get_System_times =
833 (GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
834 "GetSystemTimes");
835 }
836 if (s_pfn_Get_System_times == NULL)
837 return FALSE;
838 return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
839 }
840
841 static BOOLEAN WINAPI
842 create_symbolic_link (LPTSTR lpSymlinkFilename,
843 LPTSTR lpTargetFileName,
844 DWORD dwFlags)
845 {
846 static CreateSymbolicLink_Proc s_pfn_Create_Symbolic_Link = NULL;
847 BOOLEAN retval;
848
849 if (is_windows_9x () == TRUE)
850 {
851 errno = ENOSYS;
852 return 0;
853 }
854 if (g_b_init_create_symbolic_link == 0)
855 {
856 g_b_init_create_symbolic_link = 1;
857 #ifdef _UNICODE
858 s_pfn_Create_Symbolic_Link =
859 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
860 "CreateSymbolicLinkW");
861 #else
862 s_pfn_Create_Symbolic_Link =
863 (CreateSymbolicLink_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
864 "CreateSymbolicLinkA");
865 #endif
866 }
867 if (s_pfn_Create_Symbolic_Link == NULL)
868 {
869 errno = ENOSYS;
870 return 0;
871 }
872
873 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
874 dwFlags);
875 /* If we were denied creation of the symlink, try again after
876 enabling the SeCreateSymbolicLinkPrivilege for our process. */
877 if (!retval)
878 {
879 TOKEN_PRIVILEGES priv_current;
880
881 if (enable_privilege (SE_CREATE_SYMBOLIC_LINK_NAME, TRUE, &priv_current))
882 {
883 retval = s_pfn_Create_Symbolic_Link (lpSymlinkFilename, lpTargetFileName,
884 dwFlags);
885 restore_privilege (&priv_current);
886 revert_to_self ();
887 }
888 }
889 return retval;
890 }
891 \f
892
893 /* Return 1 if P is a valid pointer to an object of size SIZE. Return
894 0 if P is NOT a valid pointer. Return -1 if we cannot validate P.
895
896 This is called from alloc.c:valid_pointer_p. */
897 int
898 w32_valid_pointer_p (void *p, int size)
899 {
900 SIZE_T done;
901 HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());
902
903 if (h)
904 {
905 unsigned char *buf = alloca (size);
906 int retval = ReadProcessMemory (h, p, buf, size, &done);
907
908 CloseHandle (h);
909 return retval;
910 }
911 else
912 return -1;
913 }
914
915 static char startup_dir[MAXPATHLEN];
916
917 /* Get the current working directory. */
918 char *
919 getwd (char *dir)
920 {
921 #if 0
922 if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
923 return dir;
924 return NULL;
925 #else
926 /* Emacs doesn't actually change directory itself, it stays in the
927 same directory where it was started. */
928 strcpy (dir, startup_dir);
929 return dir;
930 #endif
931 }
932
933 /* Emulate getloadavg. */
934
935 struct load_sample {
936 time_t sample_time;
937 ULONGLONG idle;
938 ULONGLONG kernel;
939 ULONGLONG user;
940 };
941
942 /* Number of processors on this machine. */
943 static unsigned num_of_processors;
944
945 /* We maintain 1-sec samples for the last 16 minutes in a circular buffer. */
946 static struct load_sample samples[16*60];
947 static int first_idx = -1, last_idx = -1;
948 static int max_idx = sizeof (samples) / sizeof (samples[0]);
949
950 static int
951 buf_next (int from)
952 {
953 int next_idx = from + 1;
954
955 if (next_idx >= max_idx)
956 next_idx = 0;
957
958 return next_idx;
959 }
960
961 static int
962 buf_prev (int from)
963 {
964 int prev_idx = from - 1;
965
966 if (prev_idx < 0)
967 prev_idx = max_idx - 1;
968
969 return prev_idx;
970 }
971
972 static void
973 sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
974 {
975 SYSTEM_INFO sysinfo;
976 FILETIME ft_idle, ft_user, ft_kernel;
977
978 /* Initialize the number of processors on this machine. */
979 if (num_of_processors <= 0)
980 {
981 get_native_system_info (&sysinfo);
982 num_of_processors = sysinfo.dwNumberOfProcessors;
983 if (num_of_processors <= 0)
984 {
985 GetSystemInfo (&sysinfo);
986 num_of_processors = sysinfo.dwNumberOfProcessors;
987 }
988 if (num_of_processors <= 0)
989 num_of_processors = 1;
990 }
991
992 /* TODO: Take into account threads that are ready to run, by
993 sampling the "\System\Processor Queue Length" performance
994 counter. The code below accounts only for threads that are
995 actually running. */
996
997 if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
998 {
999 ULARGE_INTEGER uidle, ukernel, uuser;
1000
1001 memcpy (&uidle, &ft_idle, sizeof (ft_idle));
1002 memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
1003 memcpy (&uuser, &ft_user, sizeof (ft_user));
1004 *idle = uidle.QuadPart;
1005 *kernel = ukernel.QuadPart;
1006 *user = uuser.QuadPart;
1007 }
1008 else
1009 {
1010 *idle = 0;
1011 *kernel = 0;
1012 *user = 0;
1013 }
1014 }
1015
1016 /* Produce the load average for a given time interval, using the
1017 samples in the samples[] array. WHICH can be 0, 1, or 2, meaning
1018 1-minute, 5-minute, or 15-minute average, respectively. */
1019 static double
1020 getavg (int which)
1021 {
1022 double retval = -1.0;
1023 double tdiff;
1024 int idx;
1025 double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
1026 time_t now = samples[last_idx].sample_time;
1027
1028 if (first_idx != last_idx)
1029 {
1030 for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
1031 {
1032 tdiff = difftime (now, samples[idx].sample_time);
1033 if (tdiff >= span - 2*DBL_EPSILON*now)
1034 {
1035 long double sys =
1036 samples[last_idx].kernel + samples[last_idx].user
1037 - (samples[idx].kernel + samples[idx].user);
1038 long double idl = samples[last_idx].idle - samples[idx].idle;
1039
1040 retval = (1.0 - idl / sys) * num_of_processors;
1041 break;
1042 }
1043 if (idx == first_idx)
1044 break;
1045 }
1046 }
1047
1048 return retval;
1049 }
1050
1051 int
1052 getloadavg (double loadavg[], int nelem)
1053 {
1054 int elem;
1055 ULONGLONG idle, kernel, user;
1056 time_t now = time (NULL);
1057
1058 /* Store another sample. We ignore samples that are less than 1 sec
1059 apart. */
1060 if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
1061 {
1062 sample_system_load (&idle, &kernel, &user);
1063 last_idx = buf_next (last_idx);
1064 samples[last_idx].sample_time = now;
1065 samples[last_idx].idle = idle;
1066 samples[last_idx].kernel = kernel;
1067 samples[last_idx].user = user;
1068 /* If the buffer has more that 15 min worth of samples, discard
1069 the old ones. */
1070 if (first_idx == -1)
1071 first_idx = last_idx;
1072 while (first_idx != last_idx
1073 && (difftime (now, samples[first_idx].sample_time)
1074 >= 15.0*60 + 2*DBL_EPSILON*now))
1075 first_idx = buf_next (first_idx);
1076 }
1077
1078 for (elem = 0; elem < nelem; elem++)
1079 {
1080 double avg = getavg (elem);
1081
1082 if (avg < 0)
1083 break;
1084 loadavg[elem] = avg;
1085 }
1086
1087 return elem;
1088 }
1089
1090 /* Emulate getpwuid, getpwnam and others. */
1091
1092 #define PASSWD_FIELD_SIZE 256
1093
1094 static char dflt_passwd_name[PASSWD_FIELD_SIZE];
1095 static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
1096 static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
1097 static char dflt_passwd_dir[PASSWD_FIELD_SIZE];
1098 static char dflt_passwd_shell[PASSWD_FIELD_SIZE];
1099
1100 static struct passwd dflt_passwd =
1101 {
1102 dflt_passwd_name,
1103 dflt_passwd_passwd,
1104 0,
1105 0,
1106 0,
1107 dflt_passwd_gecos,
1108 dflt_passwd_dir,
1109 dflt_passwd_shell,
1110 };
1111
1112 static char dflt_group_name[GNLEN+1];
1113
1114 static struct group dflt_group =
1115 {
1116 /* When group information is not available, we return this as the
1117 group for all files. */
1118 dflt_group_name,
1119 0,
1120 };
1121
1122 unsigned
1123 getuid (void)
1124 {
1125 return dflt_passwd.pw_uid;
1126 }
1127
1128 unsigned
1129 geteuid (void)
1130 {
1131 /* I could imagine arguing for checking to see whether the user is
1132 in the Administrators group and returning a UID of 0 for that
1133 case, but I don't know how wise that would be in the long run. */
1134 return getuid ();
1135 }
1136
1137 unsigned
1138 getgid (void)
1139 {
1140 return dflt_passwd.pw_gid;
1141 }
1142
1143 unsigned
1144 getegid (void)
1145 {
1146 return getgid ();
1147 }
1148
1149 struct passwd *
1150 getpwuid (unsigned uid)
1151 {
1152 if (uid == dflt_passwd.pw_uid)
1153 return &dflt_passwd;
1154 return NULL;
1155 }
1156
1157 struct group *
1158 getgrgid (gid_t gid)
1159 {
1160 return &dflt_group;
1161 }
1162
1163 struct passwd *
1164 getpwnam (char *name)
1165 {
1166 struct passwd *pw;
1167
1168 pw = getpwuid (getuid ());
1169 if (!pw)
1170 return pw;
1171
1172 if (xstrcasecmp (name, pw->pw_name))
1173 return NULL;
1174
1175 return pw;
1176 }
1177
1178 static void
1179 init_user_info (void)
1180 {
1181 /* Find the user's real name by opening the process token and
1182 looking up the name associated with the user-sid in that token.
1183
1184 Use the relative portion of the identifier authority value from
1185 the user-sid as the user id value (same for group id using the
1186 primary group sid from the process token). */
1187
1188 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
1189 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
1190 DWORD glength = sizeof (gname);
1191 HANDLE token = NULL;
1192 SID_NAME_USE user_type;
1193 unsigned char *buf = NULL;
1194 DWORD blen = 0;
1195 TOKEN_USER user_token;
1196 TOKEN_PRIMARY_GROUP group_token;
1197 BOOL result;
1198
1199 result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
1200 if (result)
1201 {
1202 result = get_token_information (token, TokenUser, NULL, 0, &blen);
1203 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1204 {
1205 buf = xmalloc (blen);
1206 result = get_token_information (token, TokenUser,
1207 (LPVOID)buf, blen, &needed);
1208 if (result)
1209 {
1210 memcpy (&user_token, buf, sizeof (user_token));
1211 result = lookup_account_sid (NULL, user_token.User.Sid,
1212 uname, &ulength,
1213 domain, &dlength, &user_type);
1214 }
1215 }
1216 else
1217 result = FALSE;
1218 }
1219 if (result)
1220 {
1221 strcpy (dflt_passwd.pw_name, uname);
1222 /* Determine a reasonable uid value. */
1223 if (xstrcasecmp ("administrator", uname) == 0)
1224 {
1225 dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
1226 dflt_passwd.pw_gid = 513; /* well-known None gid */
1227 }
1228 else
1229 {
1230 /* Use the last sub-authority value of the RID, the relative
1231 portion of the SID, as user/group ID. */
1232 dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
1233
1234 /* Get group id and name. */
1235 result = get_token_information (token, TokenPrimaryGroup,
1236 (LPVOID)buf, blen, &needed);
1237 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
1238 {
1239 buf = xrealloc (buf, blen = needed);
1240 result = get_token_information (token, TokenPrimaryGroup,
1241 (LPVOID)buf, blen, &needed);
1242 }
1243 if (result)
1244 {
1245 memcpy (&group_token, buf, sizeof (group_token));
1246 dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
1247 dlength = sizeof (domain);
1248 /* If we can get at the real Primary Group name, use that.
1249 Otherwise, the default group name was already set to
1250 "None" in globals_of_w32. */
1251 if (lookup_account_sid (NULL, group_token.PrimaryGroup,
1252 gname, &glength, NULL, &dlength,
1253 &user_type))
1254 strcpy (dflt_group_name, gname);
1255 }
1256 else
1257 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1258 }
1259 }
1260 /* If security calls are not supported (presumably because we
1261 are running under Windows 9X), fallback to this: */
1262 else if (GetUserName (uname, &ulength))
1263 {
1264 strcpy (dflt_passwd.pw_name, uname);
1265 if (xstrcasecmp ("administrator", uname) == 0)
1266 dflt_passwd.pw_uid = 0;
1267 else
1268 dflt_passwd.pw_uid = 123;
1269 dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1270 }
1271 else
1272 {
1273 strcpy (dflt_passwd.pw_name, "unknown");
1274 dflt_passwd.pw_uid = 123;
1275 dflt_passwd.pw_gid = 123;
1276 }
1277 dflt_group.gr_gid = dflt_passwd.pw_gid;
1278
1279 /* Ensure HOME and SHELL are defined. */
1280 if (getenv ("HOME") == NULL)
1281 emacs_abort ();
1282 if (getenv ("SHELL") == NULL)
1283 emacs_abort ();
1284
1285 /* Set dir and shell from environment variables. */
1286 strcpy (dflt_passwd.pw_dir, getenv ("HOME"));
1287 strcpy (dflt_passwd.pw_shell, getenv ("SHELL"));
1288
1289 xfree (buf);
1290 if (token)
1291 CloseHandle (token);
1292 }
1293
1294 int
1295 random (void)
1296 {
1297 /* rand () on NT gives us 15 random bits...hack together 30 bits. */
1298 return ((rand () << 15) | rand ());
1299 }
1300
1301 void
1302 srandom (int seed)
1303 {
1304 srand (seed);
1305 }
1306
1307 /* Current codepage for encoding file names. */
1308 static int file_name_codepage;
1309
1310 /* Return the maximum length in bytes of a multibyte character
1311 sequence encoded in the current ANSI codepage. This is required to
1312 correctly walk the encoded file names one character at a time. */
1313 static int
1314 max_filename_mbslen (void)
1315 {
1316 /* A simple cache to avoid calling GetCPInfo every time we need to
1317 normalize a file name. The file-name encoding is not supposed to
1318 be changed too frequently, if ever. */
1319 static Lisp_Object last_file_name_encoding;
1320 static int last_max_mbslen;
1321 Lisp_Object current_encoding;
1322
1323 current_encoding = Vfile_name_coding_system;
1324 if (NILP (current_encoding))
1325 current_encoding = Vdefault_file_name_coding_system;
1326
1327 if (!EQ (last_file_name_encoding, current_encoding))
1328 {
1329 CPINFO cp_info;
1330
1331 last_file_name_encoding = current_encoding;
1332 /* Default to the current ANSI codepage. */
1333 file_name_codepage = w32_ansi_code_page;
1334 if (!NILP (current_encoding))
1335 {
1336 char *cpname = SDATA (SYMBOL_NAME (current_encoding));
1337 char *cp = NULL, *end;
1338 int cpnum;
1339
1340 if (strncmp (cpname, "cp", 2) == 0)
1341 cp = cpname + 2;
1342 else if (strncmp (cpname, "windows-", 8) == 0)
1343 cp = cpname + 8;
1344
1345 if (cp)
1346 {
1347 end = cp;
1348 cpnum = strtol (cp, &end, 10);
1349 if (cpnum && *end == '\0' && end - cp >= 2)
1350 file_name_codepage = cpnum;
1351 }
1352 }
1353
1354 if (!file_name_codepage)
1355 file_name_codepage = CP_ACP; /* CP_ACP = 0, but let's not assume that */
1356
1357 if (!GetCPInfo (file_name_codepage, &cp_info))
1358 {
1359 file_name_codepage = CP_ACP;
1360 if (!GetCPInfo (file_name_codepage, &cp_info))
1361 emacs_abort ();
1362 }
1363 last_max_mbslen = cp_info.MaxCharSize;
1364 }
1365
1366 return last_max_mbslen;
1367 }
1368
1369 /* Normalize filename by converting all path separators to
1370 the specified separator. Also conditionally convert upper
1371 case path name components to lower case. */
1372
1373 static void
1374 normalize_filename (register char *fp, char path_sep)
1375 {
1376 char sep;
1377 char *elem, *p2;
1378 int dbcs_p = max_filename_mbslen () > 1;
1379
1380 /* Always lower-case drive letters a-z, even if the filesystem
1381 preserves case in filenames.
1382 This is so filenames can be compared by string comparison
1383 functions that are case-sensitive. Even case-preserving filesystems
1384 do not distinguish case in drive letters. */
1385 if (dbcs_p)
1386 p2 = CharNextExA (file_name_codepage, fp, 0);
1387 else
1388 p2 = fp + 1;
1389
1390 if (*p2 == ':' && *fp >= 'A' && *fp <= 'Z')
1391 {
1392 *fp += 'a' - 'A';
1393 fp += 2;
1394 }
1395
1396 if (NILP (Vw32_downcase_file_names))
1397 {
1398 while (*fp)
1399 {
1400 if (*fp == '/' || *fp == '\\')
1401 *fp = path_sep;
1402 if (!dbcs_p)
1403 fp++;
1404 else
1405 fp = CharNextExA (file_name_codepage, fp, 0);
1406 }
1407 return;
1408 }
1409
1410 sep = path_sep; /* convert to this path separator */
1411 elem = fp; /* start of current path element */
1412
1413 do {
1414 if (*fp >= 'a' && *fp <= 'z')
1415 elem = 0; /* don't convert this element */
1416
1417 if (*fp == 0 || *fp == ':')
1418 {
1419 sep = *fp; /* restore current separator (or 0) */
1420 *fp = '/'; /* after conversion of this element */
1421 }
1422
1423 if (*fp == '/' || *fp == '\\')
1424 {
1425 if (elem && elem != fp)
1426 {
1427 *fp = 0; /* temporary end of string */
1428 _mbslwr (elem); /* while we convert to lower case */
1429 }
1430 *fp = sep; /* convert (or restore) path separator */
1431 elem = fp + 1; /* next element starts after separator */
1432 sep = path_sep;
1433 }
1434 if (*fp)
1435 {
1436 if (!dbcs_p)
1437 fp++;
1438 else
1439 fp = CharNextExA (file_name_codepage, fp, 0);
1440 }
1441 } while (*fp);
1442 }
1443
1444 /* Destructively turn backslashes into slashes. */
1445 void
1446 dostounix_filename (register char *p)
1447 {
1448 normalize_filename (p, '/');
1449 }
1450
1451 /* Destructively turn slashes into backslashes. */
1452 void
1453 unixtodos_filename (register char *p)
1454 {
1455 normalize_filename (p, '\\');
1456 }
1457
1458 /* Remove all CR's that are followed by a LF.
1459 (From msdos.c...probably should figure out a way to share it,
1460 although this code isn't going to ever change.) */
1461 static int
1462 crlf_to_lf (register int n, register unsigned char *buf)
1463 {
1464 unsigned char *np = buf;
1465 unsigned char *startp = buf;
1466 unsigned char *endp = buf + n;
1467
1468 if (n == 0)
1469 return n;
1470 while (buf < endp - 1)
1471 {
1472 if (*buf == 0x0d)
1473 {
1474 if (*(++buf) != 0x0a)
1475 *np++ = 0x0d;
1476 }
1477 else
1478 *np++ = *buf++;
1479 }
1480 if (buf < endp)
1481 *np++ = *buf++;
1482 return np - startp;
1483 }
1484
1485 /* Parse the root part of file name, if present. Return length and
1486 optionally store pointer to char after root. */
1487 static int
1488 parse_root (char * name, char ** pPath)
1489 {
1490 char * start = name;
1491
1492 if (name == NULL)
1493 return 0;
1494
1495 /* find the root name of the volume if given */
1496 if (isalpha (name[0]) && name[1] == ':')
1497 {
1498 /* skip past drive specifier */
1499 name += 2;
1500 if (IS_DIRECTORY_SEP (name[0]))
1501 name++;
1502 }
1503 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
1504 {
1505 int slashes = 2;
1506 int dbcs_p = max_filename_mbslen () > 1;
1507
1508 name += 2;
1509 do
1510 {
1511 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
1512 break;
1513 if (dbcs_p)
1514 name = CharNextExA (file_name_codepage, name, 0);
1515 else
1516 name++;
1517 }
1518 while ( *name );
1519 if (IS_DIRECTORY_SEP (name[0]))
1520 name++;
1521 }
1522
1523 if (pPath)
1524 *pPath = name;
1525
1526 return name - start;
1527 }
1528
1529 /* Get long base name for name; name is assumed to be absolute. */
1530 static int
1531 get_long_basename (char * name, char * buf, int size)
1532 {
1533 WIN32_FIND_DATA find_data;
1534 HANDLE dir_handle;
1535 int len = 0;
1536
1537 /* must be valid filename, no wild cards or other invalid characters */
1538 if (_mbspbrk (name, "*?|<>\""))
1539 return 0;
1540
1541 dir_handle = FindFirstFile (name, &find_data);
1542 if (dir_handle != INVALID_HANDLE_VALUE)
1543 {
1544 if ((len = strlen (find_data.cFileName)) < size)
1545 memcpy (buf, find_data.cFileName, len + 1);
1546 else
1547 len = 0;
1548 FindClose (dir_handle);
1549 }
1550 return len;
1551 }
1552
1553 /* Get long name for file, if possible (assumed to be absolute). */
1554 BOOL
1555 w32_get_long_filename (char * name, char * buf, int size)
1556 {
1557 char * o = buf;
1558 char * p;
1559 char * q;
1560 char full[ MAX_PATH ];
1561 int len;
1562
1563 len = strlen (name);
1564 if (len >= MAX_PATH)
1565 return FALSE;
1566
1567 /* Use local copy for destructive modification. */
1568 memcpy (full, name, len+1);
1569 unixtodos_filename (full);
1570
1571 /* Copy root part verbatim. */
1572 len = parse_root (full, &p);
1573 memcpy (o, full, len);
1574 o += len;
1575 *o = '\0';
1576 size -= len;
1577
1578 while (p != NULL && *p)
1579 {
1580 q = p;
1581 p = _mbschr (q, '\\');
1582 if (p) *p = '\0';
1583 len = get_long_basename (full, o, size);
1584 if (len > 0)
1585 {
1586 o += len;
1587 size -= len;
1588 if (p != NULL)
1589 {
1590 *p++ = '\\';
1591 if (size < 2)
1592 return FALSE;
1593 *o++ = '\\';
1594 size--;
1595 *o = '\0';
1596 }
1597 }
1598 else
1599 return FALSE;
1600 }
1601
1602 return TRUE;
1603 }
1604
1605 static int
1606 is_unc_volume (const char *filename)
1607 {
1608 const char *ptr = filename;
1609
1610 if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
1611 return 0;
1612
1613 if (_mbspbrk (ptr + 2, "*?|<>\"\\/"))
1614 return 0;
1615
1616 return 1;
1617 }
1618
1619 #define REG_ROOT "SOFTWARE\\GNU\\Emacs"
1620
1621 LPBYTE
1622 w32_get_resource (char *key, LPDWORD lpdwtype)
1623 {
1624 LPBYTE lpvalue;
1625 HKEY hrootkey = NULL;
1626 DWORD cbData;
1627
1628 /* Check both the current user and the local machine to see if
1629 we have any resources. */
1630
1631 if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
1632 {
1633 lpvalue = NULL;
1634
1635 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
1636 && (lpvalue = xmalloc (cbData)) != NULL
1637 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
1638 {
1639 RegCloseKey (hrootkey);
1640 return (lpvalue);
1641 }
1642
1643 xfree (lpvalue);
1644
1645 RegCloseKey (hrootkey);
1646 }
1647
1648 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
1649 {
1650 lpvalue = NULL;
1651
1652 if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
1653 && (lpvalue = xmalloc (cbData)) != NULL
1654 && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
1655 {
1656 RegCloseKey (hrootkey);
1657 return (lpvalue);
1658 }
1659
1660 xfree (lpvalue);
1661
1662 RegCloseKey (hrootkey);
1663 }
1664
1665 return (NULL);
1666 }
1667
1668 char *get_emacs_configuration (void);
1669
1670 void
1671 init_environment (char ** argv)
1672 {
1673 static const char * const tempdirs[] = {
1674 "$TMPDIR", "$TEMP", "$TMP", "c:/"
1675 };
1676
1677 int i;
1678
1679 const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);
1680
1681 /* Make sure they have a usable $TMPDIR. Many Emacs functions use
1682 temporary files and assume "/tmp" if $TMPDIR is unset, which
1683 will break on DOS/Windows. Refuse to work if we cannot find
1684 a directory, not even "c:/", usable for that purpose. */
1685 for (i = 0; i < imax ; i++)
1686 {
1687 const char *tmp = tempdirs[i];
1688
1689 if (*tmp == '$')
1690 tmp = getenv (tmp + 1);
1691 /* Note that `access' can lie to us if the directory resides on a
1692 read-only filesystem, like CD-ROM or a write-protected floppy.
1693 The only way to be really sure is to actually create a file and
1694 see if it succeeds. But I think that's too much to ask. */
1695
1696 /* MSVCRT's _access crashes with D_OK. */
1697 if (tmp && sys_access (tmp, D_OK) == 0)
1698 {
1699 char * var = alloca (strlen (tmp) + 8);
1700 sprintf (var, "TMPDIR=%s", tmp);
1701 _putenv (strdup (var));
1702 break;
1703 }
1704 }
1705 if (i >= imax)
1706 cmd_error_internal
1707 (Fcons (Qerror,
1708 Fcons (build_string ("no usable temporary directories found!!"),
1709 Qnil)),
1710 "While setting TMPDIR: ");
1711
1712 /* Check for environment variables and use registry settings if they
1713 don't exist. Fallback on default values where applicable. */
1714 {
1715 int i;
1716 LPBYTE lpval;
1717 DWORD dwType;
1718 char locale_name[32];
1719 char default_home[MAX_PATH];
1720 int appdata = 0;
1721
1722 static const struct env_entry
1723 {
1724 char * name;
1725 char * def_value;
1726 } dflt_envvars[] =
1727 {
1728 /* If the default value is NULL, we will use the value from the
1729 outside environment or the Registry, but will not push the
1730 variable into the Emacs environment if it is defined neither
1731 in the Registry nor in the outside environment. */
1732 {"HOME", "C:/"},
1733 {"PRELOAD_WINSOCK", NULL},
1734 {"emacs_dir", "C:/emacs"},
1735 {"EMACSLOADPATH", NULL},
1736 {"SHELL", "%emacs_dir%/bin/cmdproxy.exe"},
1737 {"EMACSDATA", NULL},
1738 {"EMACSPATH", NULL},
1739 {"INFOPATH", NULL},
1740 {"EMACSDOC", NULL},
1741 {"TERM", "cmd"},
1742 {"LANG", NULL},
1743 };
1744
1745 #define N_ENV_VARS sizeof (dflt_envvars)/sizeof (dflt_envvars[0])
1746
1747 /* We need to copy dflt_envvars[] and work on the copy because we
1748 don't want the dumped Emacs to inherit the values of
1749 environment variables we saw during dumping (which could be on
1750 a different system). The defaults above must be left intact. */
1751 struct env_entry env_vars[N_ENV_VARS];
1752
1753 for (i = 0; i < N_ENV_VARS; i++)
1754 env_vars[i] = dflt_envvars[i];
1755
1756 /* For backwards compatibility, check if a .emacs file exists in C:/
1757 If not, then we can try to default to the appdata directory under the
1758 user's profile, which is more likely to be writable. */
1759 if (!check_existing ("C:/.emacs"))
1760 {
1761 HRESULT profile_result;
1762 /* Dynamically load ShGetFolderPath, as it won't exist on versions
1763 of Windows 95 and NT4 that have not been updated to include
1764 MSIE 5. */
1765 ShGetFolderPath_fn get_folder_path;
1766 get_folder_path = (ShGetFolderPath_fn)
1767 GetProcAddress (GetModuleHandle ("shell32.dll"), "SHGetFolderPathA");
1768
1769 if (get_folder_path != NULL)
1770 {
1771 profile_result = get_folder_path (NULL, CSIDL_APPDATA, NULL,
1772 0, default_home);
1773
1774 /* If we can't get the appdata dir, revert to old behavior. */
1775 if (profile_result == S_OK)
1776 {
1777 env_vars[0].def_value = default_home;
1778 appdata = 1;
1779 }
1780 }
1781 }
1782
1783 /* Get default locale info and use it for LANG. */
1784 if (GetLocaleInfo (LOCALE_USER_DEFAULT,
1785 LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
1786 locale_name, sizeof (locale_name)))
1787 {
1788 for (i = 0; i < N_ENV_VARS; i++)
1789 {
1790 if (strcmp (env_vars[i].name, "LANG") == 0)
1791 {
1792 env_vars[i].def_value = locale_name;
1793 break;
1794 }
1795 }
1796 }
1797
1798 #define SET_ENV_BUF_SIZE (4 * MAX_PATH) /* to cover EMACSLOADPATH */
1799
1800 /* Treat emacs_dir specially: set it unconditionally based on our
1801 location. */
1802 {
1803 char *p;
1804 char modname[MAX_PATH];
1805
1806 if (!GetModuleFileName (NULL, modname, MAX_PATH))
1807 emacs_abort ();
1808 if ((p = _mbsrchr (modname, '\\')) == NULL)
1809 emacs_abort ();
1810 *p = 0;
1811
1812 if ((p = _mbsrchr (modname, '\\')) && xstrcasecmp (p, "\\bin") == 0)
1813 {
1814 char buf[SET_ENV_BUF_SIZE];
1815
1816 *p = 0;
1817 for (p = modname; *p; p = CharNext (p))
1818 if (*p == '\\') *p = '/';
1819
1820 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
1821 _putenv (strdup (buf));
1822 }
1823 /* Handle running emacs from the build directory: src/oo-spd/i386/ */
1824
1825 /* FIXME: should use substring of get_emacs_configuration ().
1826 But I don't think the Windows build supports alpha, mips etc
1827 anymore, so have taken the easy option for now. */
1828 else if (p && (xstrcasecmp (p, "\\i386") == 0
1829 || xstrcasecmp (p, "\\AMD64") == 0))
1830 {
1831 *p = 0;
1832 p = _mbsrchr (modname, '\\');
1833 if (p != NULL)
1834 {
1835 *p = 0;
1836 p = _mbsrchr (modname, '\\');
1837 if (p && xstrcasecmp (p, "\\src") == 0)
1838 {
1839 char buf[SET_ENV_BUF_SIZE];
1840
1841 *p = 0;
1842 for (p = modname; *p; p = CharNext (p))
1843 if (*p == '\\') *p = '/';
1844
1845 _snprintf (buf, sizeof (buf)-1, "emacs_dir=%s", modname);
1846 _putenv (strdup (buf));
1847 }
1848 }
1849 }
1850 }
1851
1852 for (i = 0; i < N_ENV_VARS; i++)
1853 {
1854 if (!getenv (env_vars[i].name))
1855 {
1856 int dont_free = 0;
1857
1858 if ((lpval = w32_get_resource (env_vars[i].name, &dwType)) == NULL
1859 /* Also ignore empty environment variables. */
1860 || *lpval == 0)
1861 {
1862 xfree (lpval);
1863 lpval = env_vars[i].def_value;
1864 dwType = REG_EXPAND_SZ;
1865 dont_free = 1;
1866 if (!strcmp (env_vars[i].name, "HOME") && !appdata)
1867 Vdelayed_warnings_list
1868 = Fcons (listn (CONSTYPE_HEAP, 2,
1869 intern ("initialization"),
1870 build_string ("Setting HOME to C:\\ by default is deprecated")),
1871 Vdelayed_warnings_list);
1872 }
1873
1874 if (lpval)
1875 {
1876 char buf1[SET_ENV_BUF_SIZE], buf2[SET_ENV_BUF_SIZE];
1877
1878 if (dwType == REG_EXPAND_SZ)
1879 ExpandEnvironmentStrings ((LPSTR) lpval, buf1, sizeof (buf1));
1880 else if (dwType == REG_SZ)
1881 strcpy (buf1, lpval);
1882 if (dwType == REG_EXPAND_SZ || dwType == REG_SZ)
1883 {
1884 _snprintf (buf2, sizeof (buf2)-1, "%s=%s", env_vars[i].name,
1885 buf1);
1886 _putenv (strdup (buf2));
1887 }
1888
1889 if (!dont_free)
1890 xfree (lpval);
1891 }
1892 }
1893 }
1894 }
1895
1896 /* Rebuild system configuration to reflect invoking system. */
1897 Vsystem_configuration = build_string (EMACS_CONFIGURATION);
1898
1899 /* Another special case: on NT, the PATH variable is actually named
1900 "Path" although cmd.exe (perhaps NT itself) arranges for
1901 environment variable lookup and setting to be case insensitive.
1902 However, Emacs assumes a fully case sensitive environment, so we
1903 need to change "Path" to "PATH" to match the expectations of
1904 various elisp packages. We do this by the sneaky method of
1905 modifying the string in the C runtime environ entry.
1906
1907 The same applies to COMSPEC. */
1908 {
1909 char ** envp;
1910
1911 for (envp = environ; *envp; envp++)
1912 if (_strnicmp (*envp, "PATH=", 5) == 0)
1913 memcpy (*envp, "PATH=", 5);
1914 else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
1915 memcpy (*envp, "COMSPEC=", 8);
1916 }
1917
1918 /* Remember the initial working directory for getwd. */
1919 /* FIXME: Do we need to resolve possible symlinks in startup_dir?
1920 Does it matter anywhere in Emacs? */
1921 if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
1922 emacs_abort ();
1923
1924 {
1925 static char modname[MAX_PATH];
1926
1927 if (!GetModuleFileName (NULL, modname, MAX_PATH))
1928 emacs_abort ();
1929 argv[0] = modname;
1930 }
1931
1932 /* Determine if there is a middle mouse button, to allow parse_button
1933 to decide whether right mouse events should be mouse-2 or
1934 mouse-3. */
1935 w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
1936
1937 init_user_info ();
1938 }
1939
1940 /* Called from expand-file-name when default-directory is not a string. */
1941
1942 char *
1943 emacs_root_dir (void)
1944 {
1945 static char root_dir[FILENAME_MAX];
1946 const char *p;
1947
1948 p = getenv ("emacs_dir");
1949 if (p == NULL)
1950 emacs_abort ();
1951 strcpy (root_dir, p);
1952 root_dir[parse_root (root_dir, NULL)] = '\0';
1953 dostounix_filename (root_dir);
1954 return root_dir;
1955 }
1956
1957 /* We don't have scripts to automatically determine the system configuration
1958 for Emacs before it's compiled, and we don't want to have to make the
1959 user enter it, so we define EMACS_CONFIGURATION to invoke this runtime
1960 routine. */
1961
1962 char *
1963 get_emacs_configuration (void)
1964 {
1965 char *arch, *oem, *os;
1966 int build_num;
1967 static char configuration_buffer[32];
1968
1969 /* Determine the processor type. */
1970 switch (get_processor_type ())
1971 {
1972
1973 #ifdef PROCESSOR_INTEL_386
1974 case PROCESSOR_INTEL_386:
1975 case PROCESSOR_INTEL_486:
1976 case PROCESSOR_INTEL_PENTIUM:
1977 #ifdef _WIN64
1978 arch = "amd64";
1979 #else
1980 arch = "i386";
1981 #endif
1982 break;
1983 #endif
1984 #ifdef PROCESSOR_AMD_X8664
1985 case PROCESSOR_AMD_X8664:
1986 arch = "amd64";
1987 break;
1988 #endif
1989
1990 #ifdef PROCESSOR_MIPS_R2000
1991 case PROCESSOR_MIPS_R2000:
1992 case PROCESSOR_MIPS_R3000:
1993 case PROCESSOR_MIPS_R4000:
1994 arch = "mips";
1995 break;
1996 #endif
1997
1998 #ifdef PROCESSOR_ALPHA_21064
1999 case PROCESSOR_ALPHA_21064:
2000 arch = "alpha";
2001 break;
2002 #endif
2003
2004 default:
2005 arch = "unknown";
2006 break;
2007 }
2008
2009 /* Use the OEM field to reflect the compiler/library combination. */
2010 #ifdef _MSC_VER
2011 #define COMPILER_NAME "msvc"
2012 #else
2013 #ifdef __GNUC__
2014 #define COMPILER_NAME "mingw"
2015 #else
2016 #define COMPILER_NAME "unknown"
2017 #endif
2018 #endif
2019 oem = COMPILER_NAME;
2020
2021 switch (osinfo_cache.dwPlatformId) {
2022 case VER_PLATFORM_WIN32_NT:
2023 os = "nt";
2024 build_num = osinfo_cache.dwBuildNumber;
2025 break;
2026 case VER_PLATFORM_WIN32_WINDOWS:
2027 if (osinfo_cache.dwMinorVersion == 0) {
2028 os = "windows95";
2029 } else {
2030 os = "windows98";
2031 }
2032 build_num = LOWORD (osinfo_cache.dwBuildNumber);
2033 break;
2034 case VER_PLATFORM_WIN32s:
2035 /* Not supported, should not happen. */
2036 os = "windows32s";
2037 build_num = LOWORD (osinfo_cache.dwBuildNumber);
2038 break;
2039 default:
2040 os = "unknown";
2041 build_num = 0;
2042 break;
2043 }
2044
2045 if (osinfo_cache.dwPlatformId == VER_PLATFORM_WIN32_NT) {
2046 sprintf (configuration_buffer, "%s-%s-%s%d.%d.%d", arch, oem, os,
2047 get_w32_major_version (), get_w32_minor_version (), build_num);
2048 } else {
2049 sprintf (configuration_buffer, "%s-%s-%s.%d", arch, oem, os, build_num);
2050 }
2051
2052 return configuration_buffer;
2053 }
2054
2055 char *
2056 get_emacs_configuration_options (void)
2057 {
2058 static char *options_buffer;
2059 char cv[32]; /* Enough for COMPILER_VERSION. */
2060 char *options[] = {
2061 cv, /* To be filled later. */
2062 #ifdef EMACSDEBUG
2063 " --no-opt",
2064 #endif
2065 #ifdef ENABLE_CHECKING
2066 " --enable-checking",
2067 #endif
2068 /* configure.bat already sets USER_CFLAGS and USER_LDFLAGS
2069 with a starting space to save work here. */
2070 #ifdef USER_CFLAGS
2071 " --cflags", USER_CFLAGS,
2072 #endif
2073 #ifdef USER_LDFLAGS
2074 " --ldflags", USER_LDFLAGS,
2075 #endif
2076 NULL
2077 };
2078 size_t size = 0;
2079 int i;
2080
2081 /* Work out the effective configure options for this build. */
2082 #ifdef _MSC_VER
2083 #define COMPILER_VERSION "--with-msvc (%d.%02d)", _MSC_VER / 100, _MSC_VER % 100
2084 #else
2085 #ifdef __GNUC__
2086 #define COMPILER_VERSION "--with-gcc (%d.%d)", __GNUC__, __GNUC_MINOR__
2087 #else
2088 #define COMPILER_VERSION ""
2089 #endif
2090 #endif
2091
2092 if (_snprintf (cv, sizeof (cv) - 1, COMPILER_VERSION) < 0)
2093 return "Error: not enough space for compiler version";
2094 cv[sizeof (cv) - 1] = '\0';
2095
2096 for (i = 0; options[i]; i++)
2097 size += strlen (options[i]);
2098
2099 options_buffer = xmalloc (size + 1);
2100 options_buffer[0] = '\0';
2101
2102 for (i = 0; options[i]; i++)
2103 strcat (options_buffer, options[i]);
2104
2105 return options_buffer;
2106 }
2107
2108
2109 #include <sys/timeb.h>
2110
2111 /* Emulate gettimeofday (Ulrich Leodolter, 1/11/95). */
2112 void
2113 gettimeofday (struct timeval *tv, struct timezone *tz)
2114 {
2115 struct _timeb tb;
2116 _ftime (&tb);
2117
2118 tv->tv_sec = tb.time;
2119 tv->tv_usec = tb.millitm * 1000L;
2120 /* Implementation note: _ftime sometimes doesn't update the dstflag
2121 according to the new timezone when the system timezone is
2122 changed. We could fix that by using GetSystemTime and
2123 GetTimeZoneInformation, but that doesn't seem necessary, since
2124 Emacs always calls gettimeofday with the 2nd argument NULL (see
2125 current_emacs_time). */
2126 if (tz)
2127 {
2128 tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich */
2129 tz->tz_dsttime = tb.dstflag; /* type of dst correction */
2130 }
2131 }
2132
2133 /* Emulate fdutimens. */
2134
2135 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
2136 TIMESPEC[0] and TIMESPEC[1], respectively.
2137 FD must be either negative -- in which case it is ignored --
2138 or a file descriptor that is open on FILE.
2139 If FD is nonnegative, then FILE can be NULL, which means
2140 use just futimes instead of utimes.
2141 If TIMESPEC is null, FAIL.
2142 Return 0 on success, -1 (setting errno) on failure. */
2143
2144 int
2145 fdutimens (int fd, char const *file, struct timespec const timespec[2])
2146 {
2147 struct _utimbuf ut;
2148
2149 if (!timespec)
2150 {
2151 errno = ENOSYS;
2152 return -1;
2153 }
2154 if (fd < 0 && !file)
2155 {
2156 errno = EBADF;
2157 return -1;
2158 }
2159 ut.actime = timespec[0].tv_sec;
2160 ut.modtime = timespec[1].tv_sec;
2161 if (fd >= 0)
2162 return _futime (fd, &ut);
2163 else
2164 return _utime (file, &ut);
2165 }
2166
2167
2168 /* ------------------------------------------------------------------------- */
2169 /* IO support and wrapper functions for the Windows API. */
2170 /* ------------------------------------------------------------------------- */
2171
2172 /* Place a wrapper around the MSVC version of ctime. It returns NULL
2173 on network directories, so we handle that case here.
2174 (Ulrich Leodolter, 1/11/95). */
2175 char *
2176 sys_ctime (const time_t *t)
2177 {
2178 char *str = (char *) ctime (t);
2179 return (str ? str : "Sun Jan 01 00:00:00 1970");
2180 }
2181
2182 /* Emulate sleep...we could have done this with a define, but that
2183 would necessitate including windows.h in the files that used it.
2184 This is much easier. */
2185 void
2186 sys_sleep (int seconds)
2187 {
2188 Sleep (seconds * 1000);
2189 }
2190
2191 /* Internal MSVC functions for low-level descriptor munging */
2192 extern int __cdecl _set_osfhnd (int fd, long h);
2193 extern int __cdecl _free_osfhnd (int fd);
2194
2195 /* parallel array of private info on file handles */
2196 filedesc fd_info [ MAXDESC ];
2197
2198 typedef struct volume_info_data {
2199 struct volume_info_data * next;
2200
2201 /* time when info was obtained */
2202 DWORD timestamp;
2203
2204 /* actual volume info */
2205 char * root_dir;
2206 DWORD serialnum;
2207 DWORD maxcomp;
2208 DWORD flags;
2209 char * name;
2210 char * type;
2211 } volume_info_data;
2212
2213 /* Global referenced by various functions. */
2214 static volume_info_data volume_info;
2215
2216 /* Vector to indicate which drives are local and fixed (for which cached
2217 data never expires). */
2218 static BOOL fixed_drives[26];
2219
2220 /* Consider cached volume information to be stale if older than 10s,
2221 at least for non-local drives. Info for fixed drives is never stale. */
2222 #define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
2223 #define VOLINFO_STILL_VALID( root_dir, info ) \
2224 ( ( isalpha (root_dir[0]) && \
2225 fixed_drives[ DRIVE_INDEX (root_dir[0]) ] ) \
2226 || GetTickCount () - info->timestamp < 10000 )
2227
2228 /* Cache support functions. */
2229
2230 /* Simple linked list with linear search is sufficient. */
2231 static volume_info_data *volume_cache = NULL;
2232
2233 static volume_info_data *
2234 lookup_volume_info (char * root_dir)
2235 {
2236 volume_info_data * info;
2237
2238 for (info = volume_cache; info; info = info->next)
2239 if (xstrcasecmp (info->root_dir, root_dir) == 0)
2240 break;
2241 return info;
2242 }
2243
2244 static void
2245 add_volume_info (char * root_dir, volume_info_data * info)
2246 {
2247 info->root_dir = xstrdup (root_dir);
2248 info->next = volume_cache;
2249 volume_cache = info;
2250 }
2251
2252
2253 /* Wrapper for GetVolumeInformation, which uses caching to avoid
2254 performance penalty (~2ms on 486 for local drives, 7.5ms for local
2255 cdrom drive, ~5-10ms or more for remote drives on LAN). */
2256 static volume_info_data *
2257 GetCachedVolumeInformation (char * root_dir)
2258 {
2259 volume_info_data * info;
2260 char default_root[ MAX_PATH ];
2261
2262 /* NULL for root_dir means use root from current directory. */
2263 if (root_dir == NULL)
2264 {
2265 if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
2266 return NULL;
2267 parse_root (default_root, &root_dir);
2268 *root_dir = 0;
2269 root_dir = default_root;
2270 }
2271
2272 /* Local fixed drives can be cached permanently. Removable drives
2273 cannot be cached permanently, since the volume name and serial
2274 number (if nothing else) can change. Remote drives should be
2275 treated as if they are removable, since there is no sure way to
2276 tell whether they are or not. Also, the UNC association of drive
2277 letters mapped to remote volumes can be changed at any time (even
2278 by other processes) without notice.
2279
2280 As a compromise, so we can benefit from caching info for remote
2281 volumes, we use a simple expiry mechanism to invalidate cache
2282 entries that are more than ten seconds old. */
2283
2284 #if 0
2285 /* No point doing this, because WNetGetConnection is even slower than
2286 GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
2287 GetDriveType is about the only call of this type which does not
2288 involve network access, and so is extremely quick). */
2289
2290 /* Map drive letter to UNC if remote. */
2291 if (isalpha (root_dir[0]) && !fixed[DRIVE_INDEX (root_dir[0])])
2292 {
2293 char remote_name[ 256 ];
2294 char drive[3] = { root_dir[0], ':' };
2295
2296 if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
2297 == NO_ERROR)
2298 /* do something */ ;
2299 }
2300 #endif
2301
2302 info = lookup_volume_info (root_dir);
2303
2304 if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
2305 {
2306 char name[ 256 ];
2307 DWORD serialnum;
2308 DWORD maxcomp;
2309 DWORD flags;
2310 char type[ 256 ];
2311
2312 /* Info is not cached, or is stale. */
2313 if (!GetVolumeInformation (root_dir,
2314 name, sizeof (name),
2315 &serialnum,
2316 &maxcomp,
2317 &flags,
2318 type, sizeof (type)))
2319 return NULL;
2320
2321 /* Cache the volume information for future use, overwriting existing
2322 entry if present. */
2323 if (info == NULL)
2324 {
2325 info = xmalloc (sizeof (volume_info_data));
2326 add_volume_info (root_dir, info);
2327 }
2328 else
2329 {
2330 xfree (info->name);
2331 xfree (info->type);
2332 }
2333
2334 info->name = xstrdup (name);
2335 info->serialnum = serialnum;
2336 info->maxcomp = maxcomp;
2337 info->flags = flags;
2338 info->type = xstrdup (type);
2339 info->timestamp = GetTickCount ();
2340 }
2341
2342 return info;
2343 }
2344
2345 /* Get information on the volume where NAME is held; set path pointer to
2346 start of pathname in NAME (past UNC header\volume header if present),
2347 if pPath is non-NULL.
2348
2349 Note: if NAME includes symlinks, the information is for the volume
2350 of the symlink, not of its target. That's because, even though
2351 GetVolumeInformation returns information about the symlink target
2352 of its argument, we only pass the root directory to
2353 GetVolumeInformation, not the full NAME. */
2354 static int
2355 get_volume_info (const char * name, const char ** pPath)
2356 {
2357 char temp[MAX_PATH];
2358 char *rootname = NULL; /* default to current volume */
2359 volume_info_data * info;
2360
2361 if (name == NULL)
2362 return FALSE;
2363
2364 /* Find the root name of the volume if given. */
2365 if (isalpha (name[0]) && name[1] == ':')
2366 {
2367 rootname = temp;
2368 temp[0] = *name++;
2369 temp[1] = *name++;
2370 temp[2] = '\\';
2371 temp[3] = 0;
2372 }
2373 else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
2374 {
2375 char *str = temp;
2376 int slashes = 4;
2377 int dbcs_p = max_filename_mbslen () > 1;
2378
2379 rootname = temp;
2380 do
2381 {
2382 if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
2383 break;
2384 if (!dbcs_p)
2385 *str++ = *name++;
2386 else
2387 {
2388 const char *p = name;
2389
2390 name = CharNextExA (file_name_codepage, name, 0);
2391 memcpy (str, p, name - p);
2392 str += name - p;
2393 }
2394 }
2395 while ( *name );
2396
2397 *str++ = '\\';
2398 *str = 0;
2399 }
2400
2401 if (pPath)
2402 *pPath = name;
2403
2404 info = GetCachedVolumeInformation (rootname);
2405 if (info != NULL)
2406 {
2407 /* Set global referenced by other functions. */
2408 volume_info = *info;
2409 return TRUE;
2410 }
2411 return FALSE;
2412 }
2413
2414 /* Determine if volume is FAT format (ie. only supports short 8.3
2415 names); also set path pointer to start of pathname in name, if
2416 pPath is non-NULL. */
2417 static int
2418 is_fat_volume (const char * name, const char ** pPath)
2419 {
2420 if (get_volume_info (name, pPath))
2421 return (volume_info.maxcomp == 12);
2422 return FALSE;
2423 }
2424
2425 /* Map filename to a valid 8.3 name if necessary.
2426 The result is a pointer to a static buffer, so CAVEAT EMPTOR! */
2427 const char *
2428 map_w32_filename (const char * name, const char ** pPath)
2429 {
2430 static char shortname[MAX_PATH];
2431 char * str = shortname;
2432 char c;
2433 char * path;
2434 const char * save_name = name;
2435
2436 if (strlen (name) >= MAX_PATH)
2437 {
2438 /* Return a filename which will cause callers to fail. */
2439 strcpy (shortname, "?");
2440 return shortname;
2441 }
2442
2443 if (is_fat_volume (name, (const char **)&path)) /* truncate to 8.3 */
2444 {
2445 register int left = 8; /* maximum number of chars in part */
2446 register int extn = 0; /* extension added? */
2447 register int dots = 2; /* maximum number of dots allowed */
2448
2449 while (name < path)
2450 *str++ = *name++; /* skip past UNC header */
2451
2452 while ((c = *name++))
2453 {
2454 switch ( c )
2455 {
2456 case ':':
2457 case '\\':
2458 case '/':
2459 *str++ = (c == ':' ? ':' : '\\');
2460 extn = 0; /* reset extension flags */
2461 dots = 2; /* max 2 dots */
2462 left = 8; /* max length 8 for main part */
2463 break;
2464 case '.':
2465 if ( dots )
2466 {
2467 /* Convert path components of the form .xxx to _xxx,
2468 but leave . and .. as they are. This allows .emacs
2469 to be read as _emacs, for example. */
2470
2471 if (! *name ||
2472 *name == '.' ||
2473 IS_DIRECTORY_SEP (*name))
2474 {
2475 *str++ = '.';
2476 dots--;
2477 }
2478 else
2479 {
2480 *str++ = '_';
2481 left--;
2482 dots = 0;
2483 }
2484 }
2485 else if ( !extn )
2486 {
2487 *str++ = '.';
2488 extn = 1; /* we've got an extension */
2489 left = 3; /* 3 chars in extension */
2490 }
2491 else
2492 {
2493 /* any embedded dots after the first are converted to _ */
2494 *str++ = '_';
2495 }
2496 break;
2497 case '~':
2498 case '#': /* don't lose these, they're important */
2499 if ( ! left )
2500 str[-1] = c; /* replace last character of part */
2501 /* FALLTHRU */
2502 default:
2503 if ( left )
2504 {
2505 *str++ = tolower (c); /* map to lower case (looks nicer) */
2506 left--;
2507 dots = 0; /* started a path component */
2508 }
2509 break;
2510 }
2511 }
2512 *str = '\0';
2513 }
2514 else
2515 {
2516 strcpy (shortname, name);
2517 unixtodos_filename (shortname);
2518 }
2519
2520 if (pPath)
2521 *pPath = shortname + (path - save_name);
2522
2523 return shortname;
2524 }
2525
2526 static int
2527 is_exec (const char * name)
2528 {
2529 char * p = strrchr (name, '.');
2530 return
2531 (p != NULL
2532 && (xstrcasecmp (p, ".exe") == 0 ||
2533 xstrcasecmp (p, ".com") == 0 ||
2534 xstrcasecmp (p, ".bat") == 0 ||
2535 xstrcasecmp (p, ".cmd") == 0));
2536 }
2537
2538 /* Emulate the Unix directory procedures opendir, closedir,
2539 and readdir. We can't use the procedures supplied in sysdep.c,
2540 so we provide them here. */
2541
2542 struct direct dir_static; /* simulated directory contents */
2543 static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
2544 static int dir_is_fat;
2545 static char dir_pathname[MAXPATHLEN+1];
2546 static WIN32_FIND_DATA dir_find_data;
2547
2548 /* Support shares on a network resource as subdirectories of a read-only
2549 root directory. */
2550 static HANDLE wnet_enum_handle = INVALID_HANDLE_VALUE;
2551 static HANDLE open_unc_volume (const char *);
2552 static char *read_unc_volume (HANDLE, char *, int);
2553 static void close_unc_volume (HANDLE);
2554
2555 DIR *
2556 opendir (char *filename)
2557 {
2558 DIR *dirp;
2559
2560 /* Opening is done by FindFirstFile. However, a read is inherent to
2561 this operation, so we defer the open until read time. */
2562
2563 if (dir_find_handle != INVALID_HANDLE_VALUE)
2564 return NULL;
2565 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2566 return NULL;
2567
2568 /* Note: We don't support traversal of UNC volumes via symlinks.
2569 Doing so would mean punishing 99.99% of use cases by resolving
2570 all the possible symlinks in FILENAME, recursively. */
2571 if (is_unc_volume (filename))
2572 {
2573 wnet_enum_handle = open_unc_volume (filename);
2574 if (wnet_enum_handle == INVALID_HANDLE_VALUE)
2575 return NULL;
2576 }
2577
2578 if (!(dirp = (DIR *) malloc (sizeof (DIR))))
2579 return NULL;
2580
2581 dirp->dd_fd = 0;
2582 dirp->dd_loc = 0;
2583 dirp->dd_size = 0;
2584
2585 strncpy (dir_pathname, map_w32_filename (filename, NULL), MAXPATHLEN);
2586 dir_pathname[MAXPATHLEN] = '\0';
2587 /* Note: We don't support symlinks to file names on FAT volumes.
2588 Doing so would mean punishing 99.99% of use cases by resolving
2589 all the possible symlinks in FILENAME, recursively. */
2590 dir_is_fat = is_fat_volume (filename, NULL);
2591
2592 return dirp;
2593 }
2594
2595 void
2596 closedir (DIR *dirp)
2597 {
2598 /* If we have a find-handle open, close it. */
2599 if (dir_find_handle != INVALID_HANDLE_VALUE)
2600 {
2601 FindClose (dir_find_handle);
2602 dir_find_handle = INVALID_HANDLE_VALUE;
2603 }
2604 else if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2605 {
2606 close_unc_volume (wnet_enum_handle);
2607 wnet_enum_handle = INVALID_HANDLE_VALUE;
2608 }
2609 xfree ((char *) dirp);
2610 }
2611
2612 struct direct *
2613 readdir (DIR *dirp)
2614 {
2615 int downcase = !NILP (Vw32_downcase_file_names);
2616
2617 if (wnet_enum_handle != INVALID_HANDLE_VALUE)
2618 {
2619 if (!read_unc_volume (wnet_enum_handle,
2620 dir_find_data.cFileName,
2621 MAX_PATH))
2622 return NULL;
2623 }
2624 /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
2625 else if (dir_find_handle == INVALID_HANDLE_VALUE)
2626 {
2627 char filename[MAXNAMLEN + 3];
2628 int ln;
2629 int dbcs_p = max_filename_mbslen () > 1;
2630
2631 strcpy (filename, dir_pathname);
2632 ln = strlen (filename) - 1;
2633 if (!dbcs_p)
2634 {
2635 if (!IS_DIRECTORY_SEP (filename[ln]))
2636 strcat (filename, "\\");
2637 }
2638 else
2639 {
2640 char *end = filename + ln + 1;
2641 char *last_char = CharPrevExA (file_name_codepage, filename, end, 0);
2642
2643 if (!IS_DIRECTORY_SEP (*last_char))
2644 strcat (filename, "\\");
2645 }
2646 strcat (filename, "*");
2647
2648 /* Note: No need to resolve symlinks in FILENAME, because
2649 FindFirst opens the directory that is the target of a
2650 symlink. */
2651 dir_find_handle = FindFirstFile (filename, &dir_find_data);
2652
2653 if (dir_find_handle == INVALID_HANDLE_VALUE)
2654 return NULL;
2655 }
2656 else
2657 {
2658 if (!FindNextFile (dir_find_handle, &dir_find_data))
2659 return NULL;
2660 }
2661
2662 /* Emacs never uses this value, so don't bother making it match
2663 value returned by stat(). */
2664 dir_static.d_ino = 1;
2665
2666 strcpy (dir_static.d_name, dir_find_data.cFileName);
2667
2668 /* If the file name in cFileName[] includes `?' characters, it means
2669 the original file name used characters that cannot be represented
2670 by the current ANSI codepage. To avoid total lossage, retrieve
2671 the short 8+3 alias of the long file name. */
2672 if (_mbspbrk (dir_static.d_name, "?"))
2673 {
2674 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
2675 downcase = 1; /* 8+3 aliases are returned in all caps */
2676 }
2677 dir_static.d_namlen = strlen (dir_static.d_name);
2678 dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
2679 dir_static.d_namlen - dir_static.d_namlen % 4;
2680
2681 /* If the file name in cFileName[] includes `?' characters, it means
2682 the original file name used characters that cannot be represented
2683 by the current ANSI codepage. To avoid total lossage, retrieve
2684 the short 8+3 alias of the long file name. */
2685 if (_mbspbrk (dir_find_data.cFileName, "?"))
2686 {
2687 strcpy (dir_static.d_name, dir_find_data.cAlternateFileName);
2688 /* 8+3 aliases are returned in all caps, which could break
2689 various alists that look at filenames' extensions. */
2690 downcase = 1;
2691 }
2692 else
2693 strcpy (dir_static.d_name, dir_find_data.cFileName);
2694 dir_static.d_namlen = strlen (dir_static.d_name);
2695 if (dir_is_fat)
2696 _mbslwr (dir_static.d_name);
2697 else if (downcase)
2698 {
2699 register char *p;
2700 int dbcs_p = max_filename_mbslen () > 1;
2701 for (p = dir_static.d_name; *p; )
2702 {
2703 if (*p >= 'a' && *p <= 'z')
2704 break;
2705 if (dbcs_p)
2706 p = CharNextExA (file_name_codepage, p, 0);
2707 else
2708 p++;
2709 }
2710 if (!*p)
2711 _mbslwr (dir_static.d_name);
2712 }
2713
2714 return &dir_static;
2715 }
2716
2717 static HANDLE
2718 open_unc_volume (const char *path)
2719 {
2720 NETRESOURCE nr;
2721 HANDLE henum;
2722 int result;
2723
2724 nr.dwScope = RESOURCE_GLOBALNET;
2725 nr.dwType = RESOURCETYPE_DISK;
2726 nr.dwDisplayType = RESOURCEDISPLAYTYPE_SERVER;
2727 nr.dwUsage = RESOURCEUSAGE_CONTAINER;
2728 nr.lpLocalName = NULL;
2729 nr.lpRemoteName = (LPSTR)map_w32_filename (path, NULL);
2730 nr.lpComment = NULL;
2731 nr.lpProvider = NULL;
2732
2733 result = WNetOpenEnum (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
2734 RESOURCEUSAGE_CONNECTABLE, &nr, &henum);
2735
2736 if (result == NO_ERROR)
2737 return henum;
2738 else
2739 return INVALID_HANDLE_VALUE;
2740 }
2741
2742 static char *
2743 read_unc_volume (HANDLE henum, char *readbuf, int size)
2744 {
2745 DWORD count;
2746 int result;
2747 DWORD bufsize = 512;
2748 char *buffer;
2749 char *ptr;
2750 int dbcs_p = max_filename_mbslen () > 1;
2751
2752 count = 1;
2753 buffer = alloca (bufsize);
2754 result = WNetEnumResource (henum, &count, buffer, &bufsize);
2755 if (result != NO_ERROR)
2756 return NULL;
2757
2758 /* WNetEnumResource returns \\resource\share...skip forward to "share". */
2759 ptr = ((LPNETRESOURCE) buffer)->lpRemoteName;
2760 ptr += 2;
2761 if (!dbcs_p)
2762 while (*ptr && !IS_DIRECTORY_SEP (*ptr)) ptr++;
2763 else
2764 {
2765 while (*ptr && !IS_DIRECTORY_SEP (*ptr))
2766 ptr = CharNextExA (file_name_codepage, ptr, 0);
2767 }
2768 ptr++;
2769
2770 strncpy (readbuf, ptr, size);
2771 return readbuf;
2772 }
2773
2774 static void
2775 close_unc_volume (HANDLE henum)
2776 {
2777 if (henum != INVALID_HANDLE_VALUE)
2778 WNetCloseEnum (henum);
2779 }
2780
2781 static DWORD
2782 unc_volume_file_attributes (const char *path)
2783 {
2784 HANDLE henum;
2785 DWORD attrs;
2786
2787 henum = open_unc_volume (path);
2788 if (henum == INVALID_HANDLE_VALUE)
2789 return -1;
2790
2791 attrs = FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY;
2792
2793 close_unc_volume (henum);
2794
2795 return attrs;
2796 }
2797
2798 /* Ensure a network connection is authenticated. */
2799 static void
2800 logon_network_drive (const char *path)
2801 {
2802 NETRESOURCE resource;
2803 char share[MAX_PATH];
2804 int n_slashes;
2805 char drive[4];
2806 UINT drvtype;
2807 char *p;
2808 int dbcs_p;
2809
2810 if (IS_DIRECTORY_SEP (path[0]) && IS_DIRECTORY_SEP (path[1]))
2811 drvtype = DRIVE_REMOTE;
2812 else if (path[0] == '\0' || path[1] != ':')
2813 drvtype = GetDriveType (NULL);
2814 else
2815 {
2816 drive[0] = path[0];
2817 drive[1] = ':';
2818 drive[2] = '\\';
2819 drive[3] = '\0';
2820 drvtype = GetDriveType (drive);
2821 }
2822
2823 /* Only logon to networked drives. */
2824 if (drvtype != DRIVE_REMOTE)
2825 return;
2826
2827 n_slashes = 2;
2828 strncpy (share, path, MAX_PATH);
2829 /* Truncate to just server and share name. */
2830 dbcs_p = max_filename_mbslen () > 1;
2831 for (p = share + 2; *p && p < share + MAX_PATH; )
2832 {
2833 if (IS_DIRECTORY_SEP (*p) && ++n_slashes > 3)
2834 {
2835 *p = '\0';
2836 break;
2837 }
2838 if (dbcs_p)
2839 p = CharNextExA (file_name_codepage, p, 0);
2840 else
2841 p++;
2842 }
2843
2844 resource.dwType = RESOURCETYPE_DISK;
2845 resource.lpLocalName = NULL;
2846 resource.lpRemoteName = share;
2847 resource.lpProvider = NULL;
2848
2849 WNetAddConnection2 (&resource, NULL, NULL, CONNECT_INTERACTIVE);
2850 }
2851
2852 /* Shadow some MSVC runtime functions to map requests for long filenames
2853 to reasonable short names if necessary. This was originally added to
2854 permit running Emacs on NT 3.1 on a FAT partition, which doesn't support
2855 long file names. */
2856
2857 int
2858 sys_access (const char * path, int mode)
2859 {
2860 DWORD attributes;
2861
2862 /* MSVCRT implementation of 'access' doesn't recognize D_OK, and its
2863 newer versions blow up when passed D_OK. */
2864 path = map_w32_filename (path, NULL);
2865 /* If the last element of PATH is a symlink, we need to resolve it
2866 to get the attributes of its target file. Note: any symlinks in
2867 PATH elements other than the last one are transparently resolved
2868 by GetFileAttributes below. */
2869 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
2870 path = chase_symlinks (path);
2871
2872 if ((attributes = GetFileAttributes (path)) == -1)
2873 {
2874 DWORD w32err = GetLastError ();
2875
2876 switch (w32err)
2877 {
2878 case ERROR_INVALID_NAME:
2879 case ERROR_BAD_PATHNAME:
2880 if (is_unc_volume (path))
2881 {
2882 attributes = unc_volume_file_attributes (path);
2883 if (attributes == -1)
2884 {
2885 errno = EACCES;
2886 return -1;
2887 }
2888 break;
2889 }
2890 /* FALLTHROUGH */
2891 case ERROR_FILE_NOT_FOUND:
2892 case ERROR_BAD_NETPATH:
2893 errno = ENOENT;
2894 break;
2895 default:
2896 errno = EACCES;
2897 break;
2898 }
2899 return -1;
2900 }
2901 if ((mode & X_OK) != 0 && !is_exec (path))
2902 {
2903 errno = EACCES;
2904 return -1;
2905 }
2906 if ((mode & W_OK) != 0 && (attributes & FILE_ATTRIBUTE_READONLY) != 0)
2907 {
2908 errno = EACCES;
2909 return -1;
2910 }
2911 if ((mode & D_OK) != 0 && (attributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
2912 {
2913 errno = EACCES;
2914 return -1;
2915 }
2916 return 0;
2917 }
2918
2919 int
2920 sys_chdir (const char * path)
2921 {
2922 return _chdir (map_w32_filename (path, NULL));
2923 }
2924
2925 int
2926 sys_chmod (const char * path, int mode)
2927 {
2928 path = chase_symlinks (map_w32_filename (path, NULL));
2929 return _chmod (path, mode);
2930 }
2931
2932 int
2933 sys_chown (const char *path, uid_t owner, gid_t group)
2934 {
2935 if (sys_chmod (path, S_IREAD) == -1) /* check if file exists */
2936 return -1;
2937 return 0;
2938 }
2939
2940 int
2941 sys_creat (const char * path, int mode)
2942 {
2943 return _creat (map_w32_filename (path, NULL), mode);
2944 }
2945
2946 FILE *
2947 sys_fopen (const char * path, const char * mode)
2948 {
2949 int fd;
2950 int oflag;
2951 const char * mode_save = mode;
2952
2953 /* Force all file handles to be non-inheritable. This is necessary to
2954 ensure child processes don't unwittingly inherit handles that might
2955 prevent future file access. */
2956
2957 if (mode[0] == 'r')
2958 oflag = O_RDONLY;
2959 else if (mode[0] == 'w' || mode[0] == 'a')
2960 oflag = O_WRONLY | O_CREAT | O_TRUNC;
2961 else
2962 return NULL;
2963
2964 /* Only do simplistic option parsing. */
2965 while (*++mode)
2966 if (mode[0] == '+')
2967 {
2968 oflag &= ~(O_RDONLY | O_WRONLY);
2969 oflag |= O_RDWR;
2970 }
2971 else if (mode[0] == 'b')
2972 {
2973 oflag &= ~O_TEXT;
2974 oflag |= O_BINARY;
2975 }
2976 else if (mode[0] == 't')
2977 {
2978 oflag &= ~O_BINARY;
2979 oflag |= O_TEXT;
2980 }
2981 else break;
2982
2983 fd = _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
2984 if (fd < 0)
2985 return NULL;
2986
2987 return _fdopen (fd, mode_save);
2988 }
2989
2990 /* This only works on NTFS volumes, but is useful to have. */
2991 int
2992 sys_link (const char * old, const char * new)
2993 {
2994 HANDLE fileh;
2995 int result = -1;
2996 char oldname[MAX_PATH], newname[MAX_PATH];
2997
2998 if (old == NULL || new == NULL)
2999 {
3000 errno = ENOENT;
3001 return -1;
3002 }
3003
3004 strcpy (oldname, map_w32_filename (old, NULL));
3005 strcpy (newname, map_w32_filename (new, NULL));
3006
3007 fileh = CreateFile (oldname, 0, 0, NULL, OPEN_EXISTING,
3008 FILE_FLAG_BACKUP_SEMANTICS, NULL);
3009 if (fileh != INVALID_HANDLE_VALUE)
3010 {
3011 int wlen;
3012
3013 /* Confusingly, the "alternate" stream name field does not apply
3014 when restoring a hard link, and instead contains the actual
3015 stream data for the link (ie. the name of the link to create).
3016 The WIN32_STREAM_ID structure before the cStreamName field is
3017 the stream header, which is then immediately followed by the
3018 stream data. */
3019
3020 struct {
3021 WIN32_STREAM_ID wid;
3022 WCHAR wbuffer[MAX_PATH]; /* extra space for link name */
3023 } data;
3024
3025 wlen = MultiByteToWideChar (CP_ACP, MB_PRECOMPOSED, newname, -1,
3026 data.wid.cStreamName, MAX_PATH);
3027 if (wlen > 0)
3028 {
3029 LPVOID context = NULL;
3030 DWORD wbytes = 0;
3031
3032 data.wid.dwStreamId = BACKUP_LINK;
3033 data.wid.dwStreamAttributes = 0;
3034 data.wid.Size.LowPart = wlen * sizeof (WCHAR);
3035 data.wid.Size.HighPart = 0;
3036 data.wid.dwStreamNameSize = 0;
3037
3038 if (BackupWrite (fileh, (LPBYTE)&data,
3039 offsetof (WIN32_STREAM_ID, cStreamName)
3040 + data.wid.Size.LowPart,
3041 &wbytes, FALSE, FALSE, &context)
3042 && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
3043 {
3044 /* succeeded */
3045 result = 0;
3046 }
3047 else
3048 {
3049 /* Should try mapping GetLastError to errno; for now just
3050 indicate a general error (eg. links not supported). */
3051 errno = EINVAL; // perhaps EMLINK?
3052 }
3053 }
3054
3055 CloseHandle (fileh);
3056 }
3057 else
3058 errno = ENOENT;
3059
3060 return result;
3061 }
3062
3063 int
3064 sys_mkdir (const char * path)
3065 {
3066 return _mkdir (map_w32_filename (path, NULL));
3067 }
3068
3069 /* Because of long name mapping issues, we need to implement this
3070 ourselves. Also, MSVC's _mktemp returns NULL when it can't generate
3071 a unique name, instead of setting the input template to an empty
3072 string.
3073
3074 Standard algorithm seems to be use pid or tid with a letter on the
3075 front (in place of the 6 X's) and cycle through the letters to find a
3076 unique name. We extend that to allow any reasonable character as the
3077 first of the 6 X's. */
3078 char *
3079 sys_mktemp (char * template)
3080 {
3081 char * p;
3082 int i;
3083 unsigned uid = GetCurrentThreadId ();
3084 static char first_char[] = "abcdefghijklmnopqrstuvwyz0123456789!%-_@#";
3085
3086 if (template == NULL)
3087 return NULL;
3088 p = template + strlen (template);
3089 i = 5;
3090 /* replace up to the last 5 X's with uid in decimal */
3091 while (--p >= template && p[0] == 'X' && --i >= 0)
3092 {
3093 p[0] = '0' + uid % 10;
3094 uid /= 10;
3095 }
3096
3097 if (i < 0 && p[0] == 'X')
3098 {
3099 i = 0;
3100 do
3101 {
3102 int save_errno = errno;
3103 p[0] = first_char[i];
3104 if (sys_access (template, 0) < 0)
3105 {
3106 errno = save_errno;
3107 return template;
3108 }
3109 }
3110 while (++i < sizeof (first_char));
3111 }
3112
3113 /* Template is badly formed or else we can't generate a unique name,
3114 so return empty string */
3115 template[0] = 0;
3116 return template;
3117 }
3118
3119 int
3120 sys_open (const char * path, int oflag, int mode)
3121 {
3122 const char* mpath = map_w32_filename (path, NULL);
3123 /* Try to open file without _O_CREAT, to be able to write to hidden
3124 and system files. Force all file handles to be
3125 non-inheritable. */
3126 int res = _open (mpath, (oflag & ~_O_CREAT) | _O_NOINHERIT, mode);
3127 if (res < 0)
3128 res = _open (mpath, oflag | _O_NOINHERIT, mode);
3129 if (res >= 0 && res < MAXDESC)
3130 fd_info[res].flags = 0;
3131
3132 return res;
3133 }
3134
3135 int
3136 sys_rename (const char * oldname, const char * newname)
3137 {
3138 BOOL result;
3139 char temp[MAX_PATH];
3140 int newname_dev;
3141 int oldname_dev;
3142
3143 /* MoveFile on Windows 95 doesn't correctly change the short file name
3144 alias in a number of circumstances (it is not easy to predict when
3145 just by looking at oldname and newname, unfortunately). In these
3146 cases, renaming through a temporary name avoids the problem.
3147
3148 A second problem on Windows 95 is that renaming through a temp name when
3149 newname is uppercase fails (the final long name ends up in
3150 lowercase, although the short alias might be uppercase) UNLESS the
3151 long temp name is not 8.3.
3152
3153 So, on Windows 95 we always rename through a temp name, and we make sure
3154 the temp name has a long extension to ensure correct renaming. */
3155
3156 strcpy (temp, map_w32_filename (oldname, NULL));
3157
3158 /* volume_info is set indirectly by map_w32_filename. */
3159 oldname_dev = volume_info.serialnum;
3160
3161 if (os_subtype == OS_9X)
3162 {
3163 char * o;
3164 char * p;
3165 int i = 0;
3166
3167 oldname = map_w32_filename (oldname, NULL);
3168 if ((o = strrchr (oldname, '\\')))
3169 o++;
3170 else
3171 o = (char *) oldname;
3172
3173 if ((p = strrchr (temp, '\\')))
3174 p++;
3175 else
3176 p = temp;
3177
3178 do
3179 {
3180 /* Force temp name to require a manufactured 8.3 alias - this
3181 seems to make the second rename work properly. */
3182 sprintf (p, "_.%s.%u", o, i);
3183 i++;
3184 result = rename (oldname, temp);
3185 }
3186 /* This loop must surely terminate! */
3187 while (result < 0 && errno == EEXIST);
3188 if (result < 0)
3189 return -1;
3190 }
3191
3192 /* Emulate Unix behavior - newname is deleted if it already exists
3193 (at least if it is a file; don't do this for directories).
3194
3195 Since we mustn't do this if we are just changing the case of the
3196 file name (we would end up deleting the file we are trying to
3197 rename!), we let rename detect if the destination file already
3198 exists - that way we avoid the possible pitfalls of trying to
3199 determine ourselves whether two names really refer to the same
3200 file, which is not always possible in the general case. (Consider
3201 all the permutations of shared or subst'd drives, etc.) */
3202
3203 newname = map_w32_filename (newname, NULL);
3204
3205 /* volume_info is set indirectly by map_w32_filename. */
3206 newname_dev = volume_info.serialnum;
3207
3208 result = rename (temp, newname);
3209
3210 if (result < 0)
3211 {
3212 DWORD w32err = GetLastError ();
3213
3214 if (errno == EACCES
3215 && newname_dev != oldname_dev)
3216 {
3217 /* The implementation of `rename' on Windows does not return
3218 errno = EXDEV when you are moving a directory to a
3219 different storage device (ex. logical disk). It returns
3220 EACCES instead. So here we handle such situations and
3221 return EXDEV. */
3222 DWORD attributes;
3223
3224 if ((attributes = GetFileAttributes (temp)) != -1
3225 && (attributes & FILE_ATTRIBUTE_DIRECTORY))
3226 errno = EXDEV;
3227 }
3228 else if (errno == EEXIST)
3229 {
3230 if (_chmod (newname, 0666) != 0)
3231 return result;
3232 if (_unlink (newname) != 0)
3233 return result;
3234 result = rename (temp, newname);
3235 }
3236 else if (w32err == ERROR_PRIVILEGE_NOT_HELD
3237 && is_symlink (temp))
3238 {
3239 /* This is Windows prohibiting the user from creating a
3240 symlink in another place, since that requires
3241 privileges. */
3242 errno = EPERM;
3243 }
3244 }
3245
3246 return result;
3247 }
3248
3249 int
3250 sys_rmdir (const char * path)
3251 {
3252 return _rmdir (map_w32_filename (path, NULL));
3253 }
3254
3255 int
3256 sys_unlink (const char * path)
3257 {
3258 path = map_w32_filename (path, NULL);
3259
3260 /* On Unix, unlink works without write permission. */
3261 _chmod (path, 0666);
3262 return _unlink (path);
3263 }
3264
3265 static FILETIME utc_base_ft;
3266 static ULONGLONG utc_base; /* In 100ns units */
3267 static int init = 0;
3268
3269 #define FILETIME_TO_U64(result, ft) \
3270 do { \
3271 ULARGE_INTEGER uiTemp; \
3272 uiTemp.LowPart = (ft).dwLowDateTime; \
3273 uiTemp.HighPart = (ft).dwHighDateTime; \
3274 result = uiTemp.QuadPart; \
3275 } while (0)
3276
3277 static void
3278 initialize_utc_base (void)
3279 {
3280 /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
3281 SYSTEMTIME st;
3282
3283 st.wYear = 1970;
3284 st.wMonth = 1;
3285 st.wDay = 1;
3286 st.wHour = 0;
3287 st.wMinute = 0;
3288 st.wSecond = 0;
3289 st.wMilliseconds = 0;
3290
3291 SystemTimeToFileTime (&st, &utc_base_ft);
3292 FILETIME_TO_U64 (utc_base, utc_base_ft);
3293 }
3294
3295 static time_t
3296 convert_time (FILETIME ft)
3297 {
3298 ULONGLONG tmp;
3299
3300 if (!init)
3301 {
3302 initialize_utc_base ();
3303 init = 1;
3304 }
3305
3306 if (CompareFileTime (&ft, &utc_base_ft) < 0)
3307 return 0;
3308
3309 FILETIME_TO_U64 (tmp, ft);
3310 return (time_t) ((tmp - utc_base) / 10000000L);
3311 }
3312
3313 static void
3314 convert_from_time_t (time_t time, FILETIME * pft)
3315 {
3316 ULARGE_INTEGER tmp;
3317
3318 if (!init)
3319 {
3320 initialize_utc_base ();
3321 init = 1;
3322 }
3323
3324 /* time in 100ns units since 1-Jan-1601 */
3325 tmp.QuadPart = (ULONGLONG) time * 10000000L + utc_base;
3326 pft->dwHighDateTime = tmp.HighPart;
3327 pft->dwLowDateTime = tmp.LowPart;
3328 }
3329
3330 #if 0
3331 /* No reason to keep this; faking inode values either by hashing or even
3332 using the file index from GetInformationByHandle, is not perfect and
3333 so by default Emacs doesn't use the inode values on Windows.
3334 Instead, we now determine file-truename correctly (except for
3335 possible drive aliasing etc). */
3336
3337 /* Modified version of "PJW" algorithm (see the "Dragon" compiler book). */
3338 static unsigned
3339 hashval (const unsigned char * str)
3340 {
3341 unsigned h = 0;
3342 while (*str)
3343 {
3344 h = (h << 4) + *str++;
3345 h ^= (h >> 28);
3346 }
3347 return h;
3348 }
3349
3350 /* Return the hash value of the canonical pathname, excluding the
3351 drive/UNC header, to get a hopefully unique inode number. */
3352 static DWORD
3353 generate_inode_val (const char * name)
3354 {
3355 char fullname[ MAX_PATH ];
3356 char * p;
3357 unsigned hash;
3358
3359 /* Get the truly canonical filename, if it exists. (Note: this
3360 doesn't resolve aliasing due to subst commands, or recognize hard
3361 links. */
3362 if (!w32_get_long_filename ((char *)name, fullname, MAX_PATH))
3363 emacs_abort ();
3364
3365 parse_root (fullname, &p);
3366 /* Normal W32 filesystems are still case insensitive. */
3367 _strlwr (p);
3368 return hashval (p);
3369 }
3370
3371 #endif
3372
3373 static PSECURITY_DESCRIPTOR
3374 get_file_security_desc_by_handle (HANDLE h)
3375 {
3376 PSECURITY_DESCRIPTOR psd = NULL;
3377 DWORD err;
3378 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3379 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3380
3381 err = get_security_info (h, SE_FILE_OBJECT, si,
3382 NULL, NULL, NULL, NULL, &psd);
3383 if (err != ERROR_SUCCESS)
3384 return NULL;
3385
3386 return psd;
3387 }
3388
3389 static PSECURITY_DESCRIPTOR
3390 get_file_security_desc_by_name (const char *fname)
3391 {
3392 PSECURITY_DESCRIPTOR psd = NULL;
3393 DWORD sd_len, err;
3394 SECURITY_INFORMATION si = OWNER_SECURITY_INFORMATION
3395 | GROUP_SECURITY_INFORMATION /* | DACL_SECURITY_INFORMATION */ ;
3396
3397 if (!get_file_security (fname, si, psd, 0, &sd_len))
3398 {
3399 err = GetLastError ();
3400 if (err != ERROR_INSUFFICIENT_BUFFER)
3401 return NULL;
3402 }
3403
3404 psd = xmalloc (sd_len);
3405 if (!get_file_security (fname, si, psd, sd_len, &sd_len))
3406 {
3407 xfree (psd);
3408 return NULL;
3409 }
3410
3411 return psd;
3412 }
3413
3414 static DWORD
3415 get_rid (PSID sid)
3416 {
3417 unsigned n_subauthorities;
3418
3419 /* Use the last sub-authority value of the RID, the relative
3420 portion of the SID, as user/group ID. */
3421 n_subauthorities = *get_sid_sub_authority_count (sid);
3422 if (n_subauthorities < 1)
3423 return 0; /* the "World" RID */
3424 return *get_sid_sub_authority (sid, n_subauthorities - 1);
3425 }
3426
3427 /* Caching SID and account values for faster lokup. */
3428
3429 #ifdef __GNUC__
3430 # define FLEXIBLE_ARRAY_MEMBER
3431 #else
3432 # define FLEXIBLE_ARRAY_MEMBER 1
3433 #endif
3434
3435 struct w32_id {
3436 unsigned rid;
3437 struct w32_id *next;
3438 char name[GNLEN+1];
3439 unsigned char sid[FLEXIBLE_ARRAY_MEMBER];
3440 };
3441
3442 static struct w32_id *w32_idlist;
3443
3444 static int
3445 w32_cached_id (PSID sid, unsigned *id, char *name)
3446 {
3447 struct w32_id *tail, *found;
3448
3449 for (found = NULL, tail = w32_idlist; tail; tail = tail->next)
3450 {
3451 if (equal_sid ((PSID)tail->sid, sid))
3452 {
3453 found = tail;
3454 break;
3455 }
3456 }
3457 if (found)
3458 {
3459 *id = found->rid;
3460 strcpy (name, found->name);
3461 return 1;
3462 }
3463 else
3464 return 0;
3465 }
3466
3467 static void
3468 w32_add_to_cache (PSID sid, unsigned id, char *name)
3469 {
3470 DWORD sid_len;
3471 struct w32_id *new_entry;
3472
3473 /* We don't want to leave behind stale cache from when Emacs was
3474 dumped. */
3475 if (initialized)
3476 {
3477 sid_len = get_length_sid (sid);
3478 new_entry = xmalloc (offsetof (struct w32_id, sid) + sid_len);
3479 if (new_entry)
3480 {
3481 new_entry->rid = id;
3482 strcpy (new_entry->name, name);
3483 copy_sid (sid_len, (PSID)new_entry->sid, sid);
3484 new_entry->next = w32_idlist;
3485 w32_idlist = new_entry;
3486 }
3487 }
3488 }
3489
3490 #define UID 1
3491 #define GID 2
3492
3493 static int
3494 get_name_and_id (PSECURITY_DESCRIPTOR psd, unsigned *id, char *nm, int what)
3495 {
3496 PSID sid = NULL;
3497 char machine[MAX_COMPUTERNAME_LENGTH+1];
3498 BOOL dflt;
3499 SID_NAME_USE ignore;
3500 char name[UNLEN+1];
3501 DWORD name_len = sizeof (name);
3502 char domain[1024];
3503 DWORD domain_len = sizeof (domain);
3504 int use_dflt = 0;
3505 int result;
3506
3507 if (what == UID)
3508 result = get_security_descriptor_owner (psd, &sid, &dflt);
3509 else if (what == GID)
3510 result = get_security_descriptor_group (psd, &sid, &dflt);
3511 else
3512 result = 0;
3513
3514 if (!result || !is_valid_sid (sid))
3515 use_dflt = 1;
3516 else if (!w32_cached_id (sid, id, nm))
3517 {
3518 if (!lookup_account_sid (NULL, sid, name, &name_len,
3519 domain, &domain_len, &ignore)
3520 || name_len > UNLEN+1)
3521 use_dflt = 1;
3522 else
3523 {
3524 *id = get_rid (sid);
3525 strcpy (nm, name);
3526 w32_add_to_cache (sid, *id, name);
3527 }
3528 }
3529 return use_dflt;
3530 }
3531
3532 static void
3533 get_file_owner_and_group (PSECURITY_DESCRIPTOR psd, struct stat *st)
3534 {
3535 int dflt_usr = 0, dflt_grp = 0;
3536
3537 if (!psd)
3538 {
3539 dflt_usr = 1;
3540 dflt_grp = 1;
3541 }
3542 else
3543 {
3544 if (get_name_and_id (psd, &st->st_uid, st->st_uname, UID))
3545 dflt_usr = 1;
3546 if (get_name_and_id (psd, &st->st_gid, st->st_gname, GID))
3547 dflt_grp = 1;
3548 }
3549 /* Consider files to belong to current user/group, if we cannot get
3550 more accurate information. */
3551 if (dflt_usr)
3552 {
3553 st->st_uid = dflt_passwd.pw_uid;
3554 strcpy (st->st_uname, dflt_passwd.pw_name);
3555 }
3556 if (dflt_grp)
3557 {
3558 st->st_gid = dflt_passwd.pw_gid;
3559 strcpy (st->st_gname, dflt_group.gr_name);
3560 }
3561 }
3562
3563 /* Return non-zero if NAME is a potentially slow filesystem. */
3564 int
3565 is_slow_fs (const char *name)
3566 {
3567 char drive_root[4];
3568 UINT devtype;
3569
3570 if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
3571 devtype = DRIVE_REMOTE; /* assume UNC name is remote */
3572 else if (!(strlen (name) >= 2 && IS_DEVICE_SEP (name[1])))
3573 devtype = GetDriveType (NULL); /* use root of current drive */
3574 else
3575 {
3576 /* GetDriveType needs the root directory of the drive. */
3577 strncpy (drive_root, name, 2);
3578 drive_root[2] = '\\';
3579 drive_root[3] = '\0';
3580 devtype = GetDriveType (drive_root);
3581 }
3582 return !(devtype == DRIVE_FIXED || devtype == DRIVE_RAMDISK);
3583 }
3584
3585 /* MSVC stat function can't cope with UNC names and has other bugs, so
3586 replace it with our own. This also allows us to calculate consistent
3587 inode values and owner/group without hacks in the main Emacs code. */
3588
3589 static int
3590 stat_worker (const char * path, struct stat * buf, int follow_symlinks)
3591 {
3592 char *name, *save_name, *r;
3593 WIN32_FIND_DATA wfd;
3594 HANDLE fh;
3595 unsigned __int64 fake_inode = 0;
3596 int permission;
3597 int len;
3598 int rootdir = FALSE;
3599 PSECURITY_DESCRIPTOR psd = NULL;
3600 int is_a_symlink = 0;
3601 DWORD file_flags = FILE_FLAG_BACKUP_SEMANTICS;
3602 DWORD access_rights = 0;
3603 DWORD fattrs = 0, serialnum = 0, fs_high = 0, fs_low = 0, nlinks = 1;
3604 FILETIME ctime, atime, wtime;
3605 int dbcs_p;
3606
3607 if (path == NULL || buf == NULL)
3608 {
3609 errno = EFAULT;
3610 return -1;
3611 }
3612
3613 save_name = name = (char *) map_w32_filename (path, &path);
3614 /* Must be valid filename, no wild cards or other invalid
3615 characters. We use _mbspbrk to support multibyte strings that
3616 might look to strpbrk as if they included literal *, ?, and other
3617 characters mentioned below that are disallowed by Windows
3618 filesystems. */
3619 if (_mbspbrk (name, "*?|<>\""))
3620 {
3621 errno = ENOENT;
3622 return -1;
3623 }
3624
3625 /* Remove trailing directory separator, unless name is the root
3626 directory of a drive or UNC volume in which case ensure there
3627 is a trailing separator. */
3628 len = strlen (name);
3629 name = strcpy (alloca (len + 2), name);
3630
3631 /* Avoid a somewhat costly call to is_symlink if the filesystem
3632 doesn't support symlinks. */
3633 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) != 0)
3634 is_a_symlink = is_symlink (name);
3635
3636 /* Plan A: Open the file and get all the necessary information via
3637 the resulting handle. This solves several issues in one blow:
3638
3639 . retrieves attributes for the target of a symlink, if needed
3640 . gets attributes of root directories and symlinks pointing to
3641 root directories, thus avoiding the need for special-casing
3642 these and detecting them by examining the file-name format
3643 . retrieves more accurate attributes (e.g., non-zero size for
3644 some directories, esp. directories that are junction points)
3645 . correctly resolves "c:/..", "/.." and similar file names
3646 . avoids run-time penalties for 99% of use cases
3647
3648 Plan A is always tried first, unless the user asked not to (but
3649 if the file is a symlink and we need to follow links, we try Plan
3650 A even if the user asked not to).
3651
3652 If Plan A fails, we go to Plan B (below), where various
3653 potentially expensive techniques must be used to handle "special"
3654 files such as UNC volumes etc. */
3655 if (!(NILP (Vw32_get_true_file_attributes)
3656 || (EQ (Vw32_get_true_file_attributes, Qlocal) && is_slow_fs (name)))
3657 /* Following symlinks requires getting the info by handle. */
3658 || (is_a_symlink && follow_symlinks))
3659 {
3660 BY_HANDLE_FILE_INFORMATION info;
3661
3662 if (is_a_symlink && !follow_symlinks)
3663 file_flags |= FILE_FLAG_OPEN_REPARSE_POINT;
3664 /* READ_CONTROL access rights are required to get security info
3665 by handle. But if the OS doesn't support security in the
3666 first place, we don't need to try. */
3667 if (is_windows_9x () != TRUE)
3668 access_rights |= READ_CONTROL;
3669
3670 fh = CreateFile (name, access_rights, 0, NULL, OPEN_EXISTING,
3671 file_flags, NULL);
3672 /* If CreateFile fails with READ_CONTROL, try again with zero as
3673 access rights. */
3674 if (fh == INVALID_HANDLE_VALUE && access_rights)
3675 fh = CreateFile (name, 0, 0, NULL, OPEN_EXISTING,
3676 file_flags, NULL);
3677 if (fh == INVALID_HANDLE_VALUE)
3678 goto no_true_file_attributes;
3679
3680 /* This is more accurate in terms of getting the correct number
3681 of links, but is quite slow (it is noticeable when Emacs is
3682 making a list of file name completions). */
3683 if (GetFileInformationByHandle (fh, &info))
3684 {
3685 nlinks = info.nNumberOfLinks;
3686 /* Might as well use file index to fake inode values, but this
3687 is not guaranteed to be unique unless we keep a handle open
3688 all the time (even then there are situations where it is
3689 not unique). Reputedly, there are at most 48 bits of info
3690 (on NTFS, presumably less on FAT). */
3691 fake_inode = info.nFileIndexHigh;
3692 fake_inode <<= 32;
3693 fake_inode += info.nFileIndexLow;
3694 serialnum = info.dwVolumeSerialNumber;
3695 fs_high = info.nFileSizeHigh;
3696 fs_low = info.nFileSizeLow;
3697 ctime = info.ftCreationTime;
3698 atime = info.ftLastAccessTime;
3699 wtime = info.ftLastWriteTime;
3700 fattrs = info.dwFileAttributes;
3701 }
3702 else
3703 {
3704 /* We don't go to Plan B here, because it's not clear that
3705 it's a good idea. The only known use case where
3706 CreateFile succeeds, but GetFileInformationByHandle fails
3707 (with ERROR_INVALID_FUNCTION) is for character devices
3708 such as NUL, PRN, etc. For these, switching to Plan B is
3709 a net loss, because we lose the character device
3710 attribute returned by GetFileType below (FindFirstFile
3711 doesn't set that bit in the attributes), and the other
3712 fields don't make sense for character devices anyway.
3713 Emacs doesn't really care for non-file entities in the
3714 context of l?stat, so neither do we. */
3715
3716 /* w32err is assigned so one could put a breakpoint here and
3717 examine its value, when GetFileInformationByHandle
3718 fails. */
3719 DWORD w32err = GetLastError ();
3720
3721 switch (w32err)
3722 {
3723 case ERROR_FILE_NOT_FOUND: /* can this ever happen? */
3724 errno = ENOENT;
3725 return -1;
3726 }
3727 }
3728
3729 /* Test for a symlink before testing for a directory, since
3730 symlinks to directories have the directory bit set, but we
3731 don't want them to appear as directories. */
3732 if (is_a_symlink && !follow_symlinks)
3733 buf->st_mode = S_IFLNK;
3734 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3735 buf->st_mode = S_IFDIR;
3736 else
3737 {
3738 DWORD ftype = GetFileType (fh);
3739
3740 switch (ftype)
3741 {
3742 case FILE_TYPE_DISK:
3743 buf->st_mode = S_IFREG;
3744 break;
3745 case FILE_TYPE_PIPE:
3746 buf->st_mode = S_IFIFO;
3747 break;
3748 case FILE_TYPE_CHAR:
3749 case FILE_TYPE_UNKNOWN:
3750 default:
3751 buf->st_mode = S_IFCHR;
3752 }
3753 }
3754 /* We produce the fallback owner and group data, based on the
3755 current user that runs Emacs, in the following cases:
3756
3757 . this is Windows 9X
3758 . getting security by handle failed, and we need to produce
3759 information for the target of a symlink (this is better
3760 than producing a potentially misleading info about the
3761 symlink itself)
3762
3763 If getting security by handle fails, and we don't need to
3764 resolve symlinks, we try getting security by name. */
3765 if (is_windows_9x () != TRUE)
3766 psd = get_file_security_desc_by_handle (fh);
3767 if (psd)
3768 {
3769 get_file_owner_and_group (psd, buf);
3770 LocalFree (psd);
3771 }
3772 else if (is_windows_9x () == TRUE)
3773 get_file_owner_and_group (NULL, buf);
3774 else if (!(is_a_symlink && follow_symlinks))
3775 {
3776 psd = get_file_security_desc_by_name (name);
3777 get_file_owner_and_group (psd, buf);
3778 xfree (psd);
3779 }
3780 else
3781 get_file_owner_and_group (NULL, buf);
3782 CloseHandle (fh);
3783 }
3784 else
3785 {
3786 no_true_file_attributes:
3787 /* Plan B: Either getting a handle on the file failed, or the
3788 caller explicitly asked us to not bother making this
3789 information more accurate.
3790
3791 Implementation note: In Plan B, we never bother to resolve
3792 symlinks, even if we got here because we tried Plan A and
3793 failed. That's because, even if the caller asked for extra
3794 precision by setting Vw32_get_true_file_attributes to t,
3795 resolving symlinks requires acquiring a file handle to the
3796 symlink, which we already know will fail. And if the user
3797 did not ask for extra precision, resolving symlinks will fly
3798 in the face of that request, since the user then wants the
3799 lightweight version of the code. */
3800 dbcs_p = max_filename_mbslen () > 1;
3801 rootdir = (path >= save_name + len - 1
3802 && (IS_DIRECTORY_SEP (*path) || *path == 0));
3803
3804 /* If name is "c:/.." or "/.." then stat "c:/" or "/". */
3805 r = IS_DEVICE_SEP (name[1]) ? &name[2] : name;
3806 if (IS_DIRECTORY_SEP (r[0])
3807 && r[1] == '.' && r[2] == '.' && r[3] == '\0')
3808 r[1] = r[2] = '\0';
3809
3810 /* Note: If NAME is a symlink to the root of a UNC volume
3811 (i.e. "\\SERVER"), we will not detect that here, and we will
3812 return data about the symlink as result of FindFirst below.
3813 This is unfortunate, but that marginal use case does not
3814 justify a call to chase_symlinks which would impose a penalty
3815 on all the other use cases. (We get here for symlinks to
3816 roots of UNC volumes because CreateFile above fails for them,
3817 unlike with symlinks to root directories X:\ of drives.) */
3818 if (is_unc_volume (name))
3819 {
3820 fattrs = unc_volume_file_attributes (name);
3821 if (fattrs == -1)
3822 return -1;
3823
3824 ctime = atime = wtime = utc_base_ft;
3825 }
3826 else if (rootdir)
3827 {
3828 if (!dbcs_p)
3829 {
3830 if (!IS_DIRECTORY_SEP (name[len-1]))
3831 strcat (name, "\\");
3832 }
3833 else
3834 {
3835 char *end = name + len;
3836 char *n = CharPrevExA (file_name_codepage, name, end, 0);
3837
3838 if (!IS_DIRECTORY_SEP (*n))
3839 strcat (name, "\\");
3840 }
3841 if (GetDriveType (name) < 2)
3842 {
3843 errno = ENOENT;
3844 return -1;
3845 }
3846
3847 fattrs = FILE_ATTRIBUTE_DIRECTORY;
3848 ctime = atime = wtime = utc_base_ft;
3849 }
3850 else
3851 {
3852 if (!dbcs_p)
3853 {
3854 if (IS_DIRECTORY_SEP (name[len-1]))
3855 name[len - 1] = 0;
3856 }
3857 else
3858 {
3859 char *end = name + len;
3860 char *n = CharPrevExA (file_name_codepage, name, end, 0);
3861
3862 if (IS_DIRECTORY_SEP (*n))
3863 *n = 0;
3864 }
3865
3866 /* (This is hacky, but helps when doing file completions on
3867 network drives.) Optimize by using information available from
3868 active readdir if possible. */
3869 len = strlen (dir_pathname);
3870 if (!dbcs_p)
3871 {
3872 if (IS_DIRECTORY_SEP (dir_pathname[len-1]))
3873 len--;
3874 }
3875 else
3876 {
3877 char *end = dir_pathname + len;
3878 char *n = CharPrevExA (file_name_codepage, dir_pathname, end, 0);
3879
3880 if (IS_DIRECTORY_SEP (*n))
3881 len--;
3882 }
3883 if (dir_find_handle != INVALID_HANDLE_VALUE
3884 && !(is_a_symlink && follow_symlinks)
3885 && strnicmp (save_name, dir_pathname, len) == 0
3886 && IS_DIRECTORY_SEP (name[len])
3887 && xstrcasecmp (name + len + 1, dir_static.d_name) == 0)
3888 {
3889 /* This was the last entry returned by readdir. */
3890 wfd = dir_find_data;
3891 }
3892 else
3893 {
3894 logon_network_drive (name);
3895
3896 fh = FindFirstFile (name, &wfd);
3897 if (fh == INVALID_HANDLE_VALUE)
3898 {
3899 errno = ENOENT;
3900 return -1;
3901 }
3902 FindClose (fh);
3903 }
3904 /* Note: if NAME is a symlink, the information we get from
3905 FindFirstFile is for the symlink, not its target. */
3906 fattrs = wfd.dwFileAttributes;
3907 ctime = wfd.ftCreationTime;
3908 atime = wfd.ftLastAccessTime;
3909 wtime = wfd.ftLastWriteTime;
3910 fs_high = wfd.nFileSizeHigh;
3911 fs_low = wfd.nFileSizeLow;
3912 fake_inode = 0;
3913 nlinks = 1;
3914 serialnum = volume_info.serialnum;
3915 }
3916 if (is_a_symlink && !follow_symlinks)
3917 buf->st_mode = S_IFLNK;
3918 else if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3919 buf->st_mode = S_IFDIR;
3920 else
3921 buf->st_mode = S_IFREG;
3922
3923 get_file_owner_and_group (NULL, buf);
3924 }
3925
3926 #if 0
3927 /* Not sure if there is any point in this. */
3928 if (!NILP (Vw32_generate_fake_inodes))
3929 fake_inode = generate_inode_val (name);
3930 else if (fake_inode == 0)
3931 {
3932 /* For want of something better, try to make everything unique. */
3933 static DWORD gen_num = 0;
3934 fake_inode = ++gen_num;
3935 }
3936 #endif
3937
3938 buf->st_ino = fake_inode;
3939
3940 buf->st_dev = serialnum;
3941 buf->st_rdev = serialnum;
3942
3943 buf->st_size = fs_high;
3944 buf->st_size <<= 32;
3945 buf->st_size += fs_low;
3946 buf->st_nlink = nlinks;
3947
3948 /* Convert timestamps to Unix format. */
3949 buf->st_mtime = convert_time (wtime);
3950 buf->st_atime = convert_time (atime);
3951 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
3952 buf->st_ctime = convert_time (ctime);
3953 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
3954
3955 /* determine rwx permissions */
3956 if (is_a_symlink && !follow_symlinks)
3957 permission = S_IREAD | S_IWRITE | S_IEXEC; /* Posix expectations */
3958 else
3959 {
3960 if (fattrs & FILE_ATTRIBUTE_READONLY)
3961 permission = S_IREAD;
3962 else
3963 permission = S_IREAD | S_IWRITE;
3964
3965 if (fattrs & FILE_ATTRIBUTE_DIRECTORY)
3966 permission |= S_IEXEC;
3967 else if (is_exec (name))
3968 permission |= S_IEXEC;
3969 }
3970
3971 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
3972
3973 return 0;
3974 }
3975
3976 int
3977 stat (const char * path, struct stat * buf)
3978 {
3979 return stat_worker (path, buf, 1);
3980 }
3981
3982 int
3983 lstat (const char * path, struct stat * buf)
3984 {
3985 return stat_worker (path, buf, 0);
3986 }
3987
3988 /* Provide fstat and utime as well as stat for consistent handling of
3989 file timestamps. */
3990 int
3991 fstat (int desc, struct stat * buf)
3992 {
3993 HANDLE fh = (HANDLE) _get_osfhandle (desc);
3994 BY_HANDLE_FILE_INFORMATION info;
3995 unsigned __int64 fake_inode;
3996 int permission;
3997
3998 switch (GetFileType (fh) & ~FILE_TYPE_REMOTE)
3999 {
4000 case FILE_TYPE_DISK:
4001 buf->st_mode = S_IFREG;
4002 if (!GetFileInformationByHandle (fh, &info))
4003 {
4004 errno = EACCES;
4005 return -1;
4006 }
4007 break;
4008 case FILE_TYPE_PIPE:
4009 buf->st_mode = S_IFIFO;
4010 goto non_disk;
4011 case FILE_TYPE_CHAR:
4012 case FILE_TYPE_UNKNOWN:
4013 default:
4014 buf->st_mode = S_IFCHR;
4015 non_disk:
4016 memset (&info, 0, sizeof (info));
4017 info.dwFileAttributes = 0;
4018 info.ftCreationTime = utc_base_ft;
4019 info.ftLastAccessTime = utc_base_ft;
4020 info.ftLastWriteTime = utc_base_ft;
4021 }
4022
4023 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4024 buf->st_mode = S_IFDIR;
4025
4026 buf->st_nlink = info.nNumberOfLinks;
4027 /* Might as well use file index to fake inode values, but this
4028 is not guaranteed to be unique unless we keep a handle open
4029 all the time (even then there are situations where it is
4030 not unique). Reputedly, there are at most 48 bits of info
4031 (on NTFS, presumably less on FAT). */
4032 fake_inode = info.nFileIndexHigh;
4033 fake_inode <<= 32;
4034 fake_inode += info.nFileIndexLow;
4035
4036 /* MSVC defines _ino_t to be short; other libc's might not. */
4037 if (sizeof (buf->st_ino) == 2)
4038 buf->st_ino = fake_inode ^ (fake_inode >> 16);
4039 else
4040 buf->st_ino = fake_inode;
4041
4042 /* Consider files to belong to current user.
4043 FIXME: this should use GetSecurityInfo API, but it is only
4044 available for _WIN32_WINNT >= 0x501. */
4045 buf->st_uid = dflt_passwd.pw_uid;
4046 buf->st_gid = dflt_passwd.pw_gid;
4047 strcpy (buf->st_uname, dflt_passwd.pw_name);
4048 strcpy (buf->st_gname, dflt_group.gr_name);
4049
4050 buf->st_dev = info.dwVolumeSerialNumber;
4051 buf->st_rdev = info.dwVolumeSerialNumber;
4052
4053 buf->st_size = info.nFileSizeHigh;
4054 buf->st_size <<= 32;
4055 buf->st_size += info.nFileSizeLow;
4056
4057 /* Convert timestamps to Unix format. */
4058 buf->st_mtime = convert_time (info.ftLastWriteTime);
4059 buf->st_atime = convert_time (info.ftLastAccessTime);
4060 if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
4061 buf->st_ctime = convert_time (info.ftCreationTime);
4062 if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
4063
4064 /* determine rwx permissions */
4065 if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
4066 permission = S_IREAD;
4067 else
4068 permission = S_IREAD | S_IWRITE;
4069
4070 if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
4071 permission |= S_IEXEC;
4072 else
4073 {
4074 #if 0 /* no way of knowing the filename */
4075 char * p = strrchr (name, '.');
4076 if (p != NULL &&
4077 (xstrcasecmp (p, ".exe") == 0 ||
4078 xstrcasecmp (p, ".com") == 0 ||
4079 xstrcasecmp (p, ".bat") == 0 ||
4080 xstrcasecmp (p, ".cmd") == 0))
4081 permission |= S_IEXEC;
4082 #endif
4083 }
4084
4085 buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
4086
4087 return 0;
4088 }
4089
4090 int
4091 utime (const char *name, struct utimbuf *times)
4092 {
4093 struct utimbuf deftime;
4094 HANDLE fh;
4095 FILETIME mtime;
4096 FILETIME atime;
4097
4098 if (times == NULL)
4099 {
4100 deftime.modtime = deftime.actime = time (NULL);
4101 times = &deftime;
4102 }
4103
4104 /* Need write access to set times. */
4105 fh = CreateFile (name, FILE_WRITE_ATTRIBUTES,
4106 /* If NAME specifies a directory, FILE_SHARE_DELETE
4107 allows other processes to delete files inside it,
4108 while we have the directory open. */
4109 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
4110 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
4111 if (fh != INVALID_HANDLE_VALUE)
4112 {
4113 convert_from_time_t (times->actime, &atime);
4114 convert_from_time_t (times->modtime, &mtime);
4115 if (!SetFileTime (fh, NULL, &atime, &mtime))
4116 {
4117 CloseHandle (fh);
4118 errno = EACCES;
4119 return -1;
4120 }
4121 CloseHandle (fh);
4122 }
4123 else
4124 {
4125 errno = EINVAL;
4126 return -1;
4127 }
4128 return 0;
4129 }
4130
4131 \f
4132 /* Symlink-related functions. */
4133 #ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
4134 #define SYMBOLIC_LINK_FLAG_DIRECTORY 0x1
4135 #endif
4136
4137 int
4138 symlink (char const *filename, char const *linkname)
4139 {
4140 char linkfn[MAX_PATH], *tgtfn;
4141 DWORD flags = 0;
4142 int dir_access, filename_ends_in_slash;
4143 int dbcs_p;
4144
4145 /* Diagnostics follows Posix as much as possible. */
4146 if (filename == NULL || linkname == NULL)
4147 {
4148 errno = EFAULT;
4149 return -1;
4150 }
4151 if (!*filename)
4152 {
4153 errno = ENOENT;
4154 return -1;
4155 }
4156 if (strlen (filename) > MAX_PATH || strlen (linkname) > MAX_PATH)
4157 {
4158 errno = ENAMETOOLONG;
4159 return -1;
4160 }
4161
4162 strcpy (linkfn, map_w32_filename (linkname, NULL));
4163 if ((volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0)
4164 {
4165 errno = EPERM;
4166 return -1;
4167 }
4168
4169 dbcs_p = max_filename_mbslen () > 1;
4170
4171 /* Note: since empty FILENAME was already rejected, we can safely
4172 refer to FILENAME[1]. */
4173 if (!(IS_DIRECTORY_SEP (filename[0]) || IS_DEVICE_SEP (filename[1])))
4174 {
4175 /* Non-absolute FILENAME is understood as being relative to
4176 LINKNAME's directory. We need to prepend that directory to
4177 FILENAME to get correct results from sys_access below, since
4178 otherwise it will interpret FILENAME relative to the
4179 directory where the Emacs process runs. Note that
4180 make-symbolic-link always makes sure LINKNAME is a fully
4181 expanded file name. */
4182 char tem[MAX_PATH];
4183 char *p = linkfn + strlen (linkfn);
4184
4185 if (!dbcs_p)
4186 {
4187 while (p > linkfn && !IS_ANY_SEP (p[-1]))
4188 p--;
4189 }
4190 else
4191 {
4192 char *p1 = CharPrevExA (file_name_codepage, linkfn, p, 0);
4193
4194 while (p > linkfn && !IS_ANY_SEP (*p1))
4195 {
4196 p = p1;
4197 p1 = CharPrevExA (file_name_codepage, linkfn, p1, 0);
4198 }
4199 }
4200 if (p > linkfn)
4201 strncpy (tem, linkfn, p - linkfn);
4202 tem[p - linkfn] = '\0';
4203 strcat (tem, filename);
4204 dir_access = sys_access (tem, D_OK);
4205 }
4206 else
4207 dir_access = sys_access (filename, D_OK);
4208
4209 /* Since Windows distinguishes between symlinks to directories and
4210 to files, we provide a kludgy feature: if FILENAME doesn't
4211 exist, but ends in a slash, we create a symlink to directory. If
4212 FILENAME exists and is a directory, we always create a symlink to
4213 directory. */
4214 if (!dbcs_p)
4215 filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
4216 else
4217 {
4218 const char *end = filename + strlen (filename);
4219 const char *n = CharPrevExA (file_name_codepage, filename, end, 0);
4220
4221 filename_ends_in_slash = IS_DIRECTORY_SEP (*n);
4222 }
4223 if (dir_access == 0 || filename_ends_in_slash)
4224 flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
4225
4226 tgtfn = (char *)map_w32_filename (filename, NULL);
4227 if (filename_ends_in_slash)
4228 tgtfn[strlen (tgtfn) - 1] = '\0';
4229
4230 errno = 0;
4231 if (!create_symbolic_link (linkfn, tgtfn, flags))
4232 {
4233 /* ENOSYS is set by create_symbolic_link, when it detects that
4234 the OS doesn't support the CreateSymbolicLink API. */
4235 if (errno != ENOSYS)
4236 {
4237 DWORD w32err = GetLastError ();
4238
4239 switch (w32err)
4240 {
4241 /* ERROR_SUCCESS is sometimes returned when LINKFN and
4242 TGTFN point to the same file name, go figure. */
4243 case ERROR_SUCCESS:
4244 case ERROR_FILE_EXISTS:
4245 errno = EEXIST;
4246 break;
4247 case ERROR_ACCESS_DENIED:
4248 errno = EACCES;
4249 break;
4250 case ERROR_FILE_NOT_FOUND:
4251 case ERROR_PATH_NOT_FOUND:
4252 case ERROR_BAD_NETPATH:
4253 case ERROR_INVALID_REPARSE_DATA:
4254 errno = ENOENT;
4255 break;
4256 case ERROR_DIRECTORY:
4257 errno = EISDIR;
4258 break;
4259 case ERROR_PRIVILEGE_NOT_HELD:
4260 case ERROR_NOT_ALL_ASSIGNED:
4261 errno = EPERM;
4262 break;
4263 case ERROR_DISK_FULL:
4264 errno = ENOSPC;
4265 break;
4266 default:
4267 errno = EINVAL;
4268 break;
4269 }
4270 }
4271 return -1;
4272 }
4273 return 0;
4274 }
4275
4276 /* A quick inexpensive test of whether FILENAME identifies a file that
4277 is a symlink. Returns non-zero if it is, zero otherwise. FILENAME
4278 must already be in the normalized form returned by
4279 map_w32_filename.
4280
4281 Note: for repeated operations on many files, it is best to test
4282 whether the underlying volume actually supports symlinks, by
4283 testing the FILE_SUPPORTS_REPARSE_POINTS bit in volume's flags, and
4284 avoid the call to this function if it doesn't. That's because the
4285 call to GetFileAttributes takes a non-negligible time, especially
4286 on non-local or removable filesystems. See stat_worker for an
4287 example of how to do that. */
4288 static int
4289 is_symlink (const char *filename)
4290 {
4291 DWORD attrs;
4292 WIN32_FIND_DATA wfd;
4293 HANDLE fh;
4294
4295 attrs = GetFileAttributes (filename);
4296 if (attrs == -1)
4297 {
4298 DWORD w32err = GetLastError ();
4299
4300 switch (w32err)
4301 {
4302 case ERROR_BAD_NETPATH: /* network share, can't be a symlink */
4303 break;
4304 case ERROR_ACCESS_DENIED:
4305 errno = EACCES;
4306 break;
4307 case ERROR_FILE_NOT_FOUND:
4308 case ERROR_PATH_NOT_FOUND:
4309 default:
4310 errno = ENOENT;
4311 break;
4312 }
4313 return 0;
4314 }
4315 if ((attrs & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
4316 return 0;
4317 logon_network_drive (filename);
4318 fh = FindFirstFile (filename, &wfd);
4319 if (fh == INVALID_HANDLE_VALUE)
4320 return 0;
4321 FindClose (fh);
4322 return (wfd.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0
4323 && (wfd.dwReserved0 & IO_REPARSE_TAG_SYMLINK) == IO_REPARSE_TAG_SYMLINK;
4324 }
4325
4326 /* If NAME identifies a symbolic link, copy into BUF the file name of
4327 the symlink's target. Copy at most BUF_SIZE bytes, and do NOT
4328 null-terminate the target name, even if it fits. Return the number
4329 of bytes copied, or -1 if NAME is not a symlink or any error was
4330 encountered while resolving it. The file name copied into BUF is
4331 encoded in the current ANSI codepage. */
4332 ssize_t
4333 readlink (const char *name, char *buf, size_t buf_size)
4334 {
4335 const char *path;
4336 TOKEN_PRIVILEGES privs;
4337 int restore_privs = 0;
4338 HANDLE sh;
4339 ssize_t retval;
4340
4341 if (name == NULL)
4342 {
4343 errno = EFAULT;
4344 return -1;
4345 }
4346 if (!*name)
4347 {
4348 errno = ENOENT;
4349 return -1;
4350 }
4351
4352 path = map_w32_filename (name, NULL);
4353
4354 if (strlen (path) > MAX_PATH)
4355 {
4356 errno = ENAMETOOLONG;
4357 return -1;
4358 }
4359
4360 errno = 0;
4361 if (is_windows_9x () == TRUE
4362 || (volume_info.flags & FILE_SUPPORTS_REPARSE_POINTS) == 0
4363 || !is_symlink (path))
4364 {
4365 if (!errno)
4366 errno = EINVAL; /* not a symlink */
4367 return -1;
4368 }
4369
4370 /* Done with simple tests, now we're in for some _real_ work. */
4371 if (enable_privilege (SE_BACKUP_NAME, TRUE, &privs))
4372 restore_privs = 1;
4373 /* Implementation note: From here and onward, don't return early,
4374 since that will fail to restore the original set of privileges of
4375 the calling thread. */
4376
4377 retval = -1; /* not too optimistic, are we? */
4378
4379 /* Note: In the next call to CreateFile, we use zero as the 2nd
4380 argument because, when the symlink is a hidden/system file,
4381 e.g. 'C:\Users\All Users', GENERIC_READ fails with
4382 ERROR_ACCESS_DENIED. Zero seems to work just fine, both for file
4383 and directory symlinks. */
4384 sh = CreateFile (path, 0, 0, NULL, OPEN_EXISTING,
4385 FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
4386 NULL);
4387 if (sh != INVALID_HANDLE_VALUE)
4388 {
4389 BYTE reparse_buf[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
4390 REPARSE_DATA_BUFFER *reparse_data = (REPARSE_DATA_BUFFER *)&reparse_buf[0];
4391 DWORD retbytes;
4392
4393 if (!DeviceIoControl (sh, FSCTL_GET_REPARSE_POINT, NULL, 0,
4394 reparse_buf, MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
4395 &retbytes, NULL))
4396 errno = EIO;
4397 else if (reparse_data->ReparseTag != IO_REPARSE_TAG_SYMLINK)
4398 errno = EINVAL;
4399 else
4400 {
4401 /* Copy the link target name, in wide characters, fro
4402 reparse_data, then convert it to multibyte encoding in
4403 the current locale's codepage. */
4404 WCHAR *lwname;
4405 BYTE lname[MAX_PATH];
4406 USHORT lname_len;
4407 USHORT lwname_len =
4408 reparse_data->SymbolicLinkReparseBuffer.PrintNameLength;
4409 WCHAR *lwname_src =
4410 reparse_data->SymbolicLinkReparseBuffer.PathBuffer
4411 + reparse_data->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(WCHAR);
4412 /* This updates file_name_codepage which we need below. */
4413 int dbcs_p = max_filename_mbslen () > 1;
4414
4415 /* According to MSDN, PrintNameLength does not include the
4416 terminating null character. */
4417 lwname = alloca ((lwname_len + 1) * sizeof(WCHAR));
4418 memcpy (lwname, lwname_src, lwname_len);
4419 lwname[lwname_len/sizeof(WCHAR)] = 0; /* null-terminate */
4420
4421 lname_len = WideCharToMultiByte (file_name_codepage, 0, lwname, -1,
4422 lname, MAX_PATH, NULL, NULL);
4423 if (!lname_len)
4424 {
4425 /* WideCharToMultiByte failed. */
4426 DWORD w32err1 = GetLastError ();
4427
4428 switch (w32err1)
4429 {
4430 case ERROR_INSUFFICIENT_BUFFER:
4431 errno = ENAMETOOLONG;
4432 break;
4433 case ERROR_INVALID_PARAMETER:
4434 errno = EFAULT;
4435 break;
4436 case ERROR_NO_UNICODE_TRANSLATION:
4437 errno = ENOENT;
4438 break;
4439 default:
4440 errno = EINVAL;
4441 break;
4442 }
4443 }
4444 else
4445 {
4446 size_t size_to_copy = buf_size;
4447 BYTE *p = lname, *p2;
4448 BYTE *pend = p + lname_len;
4449
4450 /* Normalize like dostounix_filename does, but we don't
4451 want to assume that lname is null-terminated. */
4452 if (dbcs_p)
4453 p2 = CharNextExA (file_name_codepage, p, 0);
4454 else
4455 p2 = p + 1;
4456 if (*p && *p2 == ':' && *p >= 'A' && *p <= 'Z')
4457 {
4458 *p += 'a' - 'A';
4459 p += 2;
4460 }
4461 while (p <= pend)
4462 {
4463 if (*p == '\\')
4464 *p = '/';
4465 if (dbcs_p)
4466 {
4467 p = CharNextExA (file_name_codepage, p, 0);
4468 /* CharNextExA doesn't advance at null character. */
4469 if (!*p)
4470 break;
4471 }
4472 else
4473 ++p;
4474 }
4475 /* Testing for null-terminated LNAME is paranoia:
4476 WideCharToMultiByte should always return a
4477 null-terminated string when its 4th argument is -1
4478 and its 3rd argument is null-terminated (which they
4479 are, see above). */
4480 if (lname[lname_len - 1] == '\0')
4481 lname_len--;
4482 if (lname_len <= buf_size)
4483 size_to_copy = lname_len;
4484 strncpy (buf, lname, size_to_copy);
4485 /* Success! */
4486 retval = size_to_copy;
4487 }
4488 }
4489 CloseHandle (sh);
4490 }
4491 else
4492 {
4493 /* CreateFile failed. */
4494 DWORD w32err2 = GetLastError ();
4495
4496 switch (w32err2)
4497 {
4498 case ERROR_FILE_NOT_FOUND:
4499 case ERROR_PATH_NOT_FOUND:
4500 errno = ENOENT;
4501 break;
4502 case ERROR_ACCESS_DENIED:
4503 case ERROR_TOO_MANY_OPEN_FILES:
4504 errno = EACCES;
4505 break;
4506 default:
4507 errno = EPERM;
4508 break;
4509 }
4510 }
4511 if (restore_privs)
4512 {
4513 restore_privilege (&privs);
4514 revert_to_self ();
4515 }
4516
4517 return retval;
4518 }
4519
4520 /* If FILE is a symlink, return its target (stored in a static
4521 buffer); otherwise return FILE.
4522
4523 This function repeatedly resolves symlinks in the last component of
4524 a chain of symlink file names, as in foo -> bar -> baz -> ...,
4525 until it arrives at a file whose last component is not a symlink,
4526 or some error occurs. It returns the target of the last
4527 successfully resolved symlink in the chain. If it succeeds to
4528 resolve even a single symlink, the value returned is an absolute
4529 file name with backslashes (result of GetFullPathName). By
4530 contrast, if the original FILE is returned, it is unaltered.
4531
4532 Note: This function can set errno even if it succeeds.
4533
4534 Implementation note: we only resolve the last portion ("basename")
4535 of the argument FILE and of each following file in the chain,
4536 disregarding any possible symlinks in its leading directories.
4537 This is because Windows system calls and library functions
4538 transparently resolve symlinks in leading directories and return
4539 correct information, as long as the basename is not a symlink. */
4540 static char *
4541 chase_symlinks (const char *file)
4542 {
4543 static char target[MAX_PATH];
4544 char link[MAX_PATH];
4545 ssize_t res, link_len;
4546 int loop_count = 0;
4547 int dbcs_p;
4548
4549 if (is_windows_9x () == TRUE || !is_symlink (file))
4550 return (char *)file;
4551
4552 if ((link_len = GetFullPathName (file, MAX_PATH, link, NULL)) == 0)
4553 return (char *)file;
4554
4555 dbcs_p = max_filename_mbslen () > 1;
4556 target[0] = '\0';
4557 do {
4558
4559 /* Remove trailing slashes, as we want to resolve the last
4560 non-trivial part of the link name. */
4561 if (!dbcs_p)
4562 {
4563 while (link_len > 3 && IS_DIRECTORY_SEP (link[link_len-1]))
4564 link[link_len--] = '\0';
4565 }
4566 else if (link_len > 3)
4567 {
4568 char *n = CharPrevExA (file_name_codepage, link, link + link_len, 0);
4569
4570 while (n >= link + 2 && IS_DIRECTORY_SEP (*n))
4571 {
4572 n[1] = '\0';
4573 n = CharPrevExA (file_name_codepage, link, n, 0);
4574 }
4575 }
4576
4577 res = readlink (link, target, MAX_PATH);
4578 if (res > 0)
4579 {
4580 target[res] = '\0';
4581 if (!(IS_DEVICE_SEP (target[1])
4582 || (IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))))
4583 {
4584 /* Target is relative. Append it to the directory part of
4585 the symlink, then copy the result back to target. */
4586 char *p = link + link_len;
4587
4588 if (!dbcs_p)
4589 {
4590 while (p > link && !IS_ANY_SEP (p[-1]))
4591 p--;
4592 }
4593 else
4594 {
4595 char *p1 = CharPrevExA (file_name_codepage, link, p, 0);
4596
4597 while (p > link && !IS_ANY_SEP (*p1))
4598 {
4599 p = p1;
4600 p1 = CharPrevExA (file_name_codepage, link, p1, 0);
4601 }
4602 }
4603 strcpy (p, target);
4604 strcpy (target, link);
4605 }
4606 /* Resolve any "." and ".." to get a fully-qualified file name
4607 in link[] again. */
4608 link_len = GetFullPathName (target, MAX_PATH, link, NULL);
4609 }
4610 } while (res > 0 && link_len > 0 && ++loop_count <= 100);
4611
4612 if (loop_count > 100)
4613 errno = ELOOP;
4614
4615 if (target[0] == '\0') /* not a single call to readlink succeeded */
4616 return (char *)file;
4617 return target;
4618 }
4619
4620 /* MS-Windows version of careadlinkat (cf. ../lib/careadlinkat.c). We
4621 have a fixed max size for file names, so we don't need the kind of
4622 alloc/malloc/realloc dance the gnulib version does. We also don't
4623 support FD-relative symlinks. */
4624 char *
4625 careadlinkat (int fd, char const *filename,
4626 char *buffer, size_t buffer_size,
4627 struct allocator const *alloc,
4628 ssize_t (*preadlinkat) (int, char const *, char *, size_t))
4629 {
4630 char linkname[MAX_PATH];
4631 ssize_t link_size;
4632
4633 if (fd != AT_FDCWD)
4634 {
4635 errno = EINVAL;
4636 return NULL;
4637 }
4638
4639 link_size = preadlinkat (fd, filename, linkname, sizeof(linkname));
4640
4641 if (link_size > 0)
4642 {
4643 char *retval = buffer;
4644
4645 linkname[link_size++] = '\0';
4646 if (link_size > buffer_size)
4647 retval = (char *)(alloc ? alloc->allocate : xmalloc) (link_size);
4648 if (retval)
4649 memcpy (retval, linkname, link_size);
4650
4651 return retval;
4652 }
4653 return NULL;
4654 }
4655
4656 ssize_t
4657 careadlinkatcwd (int fd, char const *filename, char *buffer,
4658 size_t buffer_size)
4659 {
4660 (void) fd;
4661 return readlink (filename, buffer, buffer_size);
4662 }
4663
4664 \f
4665 /* Support for browsing other processes and their attributes. See
4666 process.c for the Lisp bindings. */
4667
4668 /* Helper wrapper functions. */
4669
4670 static HANDLE WINAPI
4671 create_toolhelp32_snapshot (DWORD Flags, DWORD Ignored)
4672 {
4673 static CreateToolhelp32Snapshot_Proc s_pfn_Create_Toolhelp32_Snapshot = NULL;
4674
4675 if (g_b_init_create_toolhelp32_snapshot == 0)
4676 {
4677 g_b_init_create_toolhelp32_snapshot = 1;
4678 s_pfn_Create_Toolhelp32_Snapshot = (CreateToolhelp32Snapshot_Proc)
4679 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4680 "CreateToolhelp32Snapshot");
4681 }
4682 if (s_pfn_Create_Toolhelp32_Snapshot == NULL)
4683 {
4684 return INVALID_HANDLE_VALUE;
4685 }
4686 return (s_pfn_Create_Toolhelp32_Snapshot (Flags, Ignored));
4687 }
4688
4689 static BOOL WINAPI
4690 process32_first (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
4691 {
4692 static Process32First_Proc s_pfn_Process32_First = NULL;
4693
4694 if (g_b_init_process32_first == 0)
4695 {
4696 g_b_init_process32_first = 1;
4697 s_pfn_Process32_First = (Process32First_Proc)
4698 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4699 "Process32First");
4700 }
4701 if (s_pfn_Process32_First == NULL)
4702 {
4703 return FALSE;
4704 }
4705 return (s_pfn_Process32_First (hSnapshot, lppe));
4706 }
4707
4708 static BOOL WINAPI
4709 process32_next (HANDLE hSnapshot, LPPROCESSENTRY32 lppe)
4710 {
4711 static Process32Next_Proc s_pfn_Process32_Next = NULL;
4712
4713 if (g_b_init_process32_next == 0)
4714 {
4715 g_b_init_process32_next = 1;
4716 s_pfn_Process32_Next = (Process32Next_Proc)
4717 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4718 "Process32Next");
4719 }
4720 if (s_pfn_Process32_Next == NULL)
4721 {
4722 return FALSE;
4723 }
4724 return (s_pfn_Process32_Next (hSnapshot, lppe));
4725 }
4726
4727 static BOOL WINAPI
4728 open_thread_token (HANDLE ThreadHandle,
4729 DWORD DesiredAccess,
4730 BOOL OpenAsSelf,
4731 PHANDLE TokenHandle)
4732 {
4733 static OpenThreadToken_Proc s_pfn_Open_Thread_Token = NULL;
4734 HMODULE hm_advapi32 = NULL;
4735 if (is_windows_9x () == TRUE)
4736 {
4737 SetLastError (ERROR_NOT_SUPPORTED);
4738 return FALSE;
4739 }
4740 if (g_b_init_open_thread_token == 0)
4741 {
4742 g_b_init_open_thread_token = 1;
4743 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4744 s_pfn_Open_Thread_Token =
4745 (OpenThreadToken_Proc) GetProcAddress (hm_advapi32, "OpenThreadToken");
4746 }
4747 if (s_pfn_Open_Thread_Token == NULL)
4748 {
4749 SetLastError (ERROR_NOT_SUPPORTED);
4750 return FALSE;
4751 }
4752 return (
4753 s_pfn_Open_Thread_Token (
4754 ThreadHandle,
4755 DesiredAccess,
4756 OpenAsSelf,
4757 TokenHandle)
4758 );
4759 }
4760
4761 static BOOL WINAPI
4762 impersonate_self (SECURITY_IMPERSONATION_LEVEL ImpersonationLevel)
4763 {
4764 static ImpersonateSelf_Proc s_pfn_Impersonate_Self = NULL;
4765 HMODULE hm_advapi32 = NULL;
4766 if (is_windows_9x () == TRUE)
4767 {
4768 return FALSE;
4769 }
4770 if (g_b_init_impersonate_self == 0)
4771 {
4772 g_b_init_impersonate_self = 1;
4773 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4774 s_pfn_Impersonate_Self =
4775 (ImpersonateSelf_Proc) GetProcAddress (hm_advapi32, "ImpersonateSelf");
4776 }
4777 if (s_pfn_Impersonate_Self == NULL)
4778 {
4779 return FALSE;
4780 }
4781 return s_pfn_Impersonate_Self (ImpersonationLevel);
4782 }
4783
4784 static BOOL WINAPI
4785 revert_to_self (void)
4786 {
4787 static RevertToSelf_Proc s_pfn_Revert_To_Self = NULL;
4788 HMODULE hm_advapi32 = NULL;
4789 if (is_windows_9x () == TRUE)
4790 {
4791 return FALSE;
4792 }
4793 if (g_b_init_revert_to_self == 0)
4794 {
4795 g_b_init_revert_to_self = 1;
4796 hm_advapi32 = LoadLibrary ("Advapi32.dll");
4797 s_pfn_Revert_To_Self =
4798 (RevertToSelf_Proc) GetProcAddress (hm_advapi32, "RevertToSelf");
4799 }
4800 if (s_pfn_Revert_To_Self == NULL)
4801 {
4802 return FALSE;
4803 }
4804 return s_pfn_Revert_To_Self ();
4805 }
4806
4807 static BOOL WINAPI
4808 get_process_memory_info (HANDLE h_proc,
4809 PPROCESS_MEMORY_COUNTERS mem_counters,
4810 DWORD bufsize)
4811 {
4812 static GetProcessMemoryInfo_Proc s_pfn_Get_Process_Memory_Info = NULL;
4813 HMODULE hm_psapi = NULL;
4814 if (is_windows_9x () == TRUE)
4815 {
4816 return FALSE;
4817 }
4818 if (g_b_init_get_process_memory_info == 0)
4819 {
4820 g_b_init_get_process_memory_info = 1;
4821 hm_psapi = LoadLibrary ("Psapi.dll");
4822 if (hm_psapi)
4823 s_pfn_Get_Process_Memory_Info = (GetProcessMemoryInfo_Proc)
4824 GetProcAddress (hm_psapi, "GetProcessMemoryInfo");
4825 }
4826 if (s_pfn_Get_Process_Memory_Info == NULL)
4827 {
4828 return FALSE;
4829 }
4830 return s_pfn_Get_Process_Memory_Info (h_proc, mem_counters, bufsize);
4831 }
4832
4833 static BOOL WINAPI
4834 get_process_working_set_size (HANDLE h_proc,
4835 PSIZE_T minrss,
4836 PSIZE_T maxrss)
4837 {
4838 static GetProcessWorkingSetSize_Proc
4839 s_pfn_Get_Process_Working_Set_Size = NULL;
4840
4841 if (is_windows_9x () == TRUE)
4842 {
4843 return FALSE;
4844 }
4845 if (g_b_init_get_process_working_set_size == 0)
4846 {
4847 g_b_init_get_process_working_set_size = 1;
4848 s_pfn_Get_Process_Working_Set_Size = (GetProcessWorkingSetSize_Proc)
4849 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4850 "GetProcessWorkingSetSize");
4851 }
4852 if (s_pfn_Get_Process_Working_Set_Size == NULL)
4853 {
4854 return FALSE;
4855 }
4856 return s_pfn_Get_Process_Working_Set_Size (h_proc, minrss, maxrss);
4857 }
4858
4859 static BOOL WINAPI
4860 global_memory_status (MEMORYSTATUS *buf)
4861 {
4862 static GlobalMemoryStatus_Proc s_pfn_Global_Memory_Status = NULL;
4863
4864 if (is_windows_9x () == TRUE)
4865 {
4866 return FALSE;
4867 }
4868 if (g_b_init_global_memory_status == 0)
4869 {
4870 g_b_init_global_memory_status = 1;
4871 s_pfn_Global_Memory_Status = (GlobalMemoryStatus_Proc)
4872 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4873 "GlobalMemoryStatus");
4874 }
4875 if (s_pfn_Global_Memory_Status == NULL)
4876 {
4877 return FALSE;
4878 }
4879 return s_pfn_Global_Memory_Status (buf);
4880 }
4881
4882 static BOOL WINAPI
4883 global_memory_status_ex (MEMORY_STATUS_EX *buf)
4884 {
4885 static GlobalMemoryStatusEx_Proc s_pfn_Global_Memory_Status_Ex = NULL;
4886
4887 if (is_windows_9x () == TRUE)
4888 {
4889 return FALSE;
4890 }
4891 if (g_b_init_global_memory_status_ex == 0)
4892 {
4893 g_b_init_global_memory_status_ex = 1;
4894 s_pfn_Global_Memory_Status_Ex = (GlobalMemoryStatusEx_Proc)
4895 GetProcAddress (GetModuleHandle ("kernel32.dll"),
4896 "GlobalMemoryStatusEx");
4897 }
4898 if (s_pfn_Global_Memory_Status_Ex == NULL)
4899 {
4900 return FALSE;
4901 }
4902 return s_pfn_Global_Memory_Status_Ex (buf);
4903 }
4904
4905 Lisp_Object
4906 list_system_processes (void)
4907 {
4908 struct gcpro gcpro1;
4909 Lisp_Object proclist = Qnil;
4910 HANDLE h_snapshot;
4911
4912 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
4913
4914 if (h_snapshot != INVALID_HANDLE_VALUE)
4915 {
4916 PROCESSENTRY32 proc_entry;
4917 DWORD proc_id;
4918 BOOL res;
4919
4920 GCPRO1 (proclist);
4921
4922 proc_entry.dwSize = sizeof (PROCESSENTRY32);
4923 for (res = process32_first (h_snapshot, &proc_entry); res;
4924 res = process32_next (h_snapshot, &proc_entry))
4925 {
4926 proc_id = proc_entry.th32ProcessID;
4927 proclist = Fcons (make_fixnum_or_float (proc_id), proclist);
4928 }
4929
4930 CloseHandle (h_snapshot);
4931 UNGCPRO;
4932 proclist = Fnreverse (proclist);
4933 }
4934
4935 return proclist;
4936 }
4937
4938 static int
4939 enable_privilege (LPCTSTR priv_name, BOOL enable_p, TOKEN_PRIVILEGES *old_priv)
4940 {
4941 TOKEN_PRIVILEGES priv;
4942 DWORD priv_size = sizeof (priv);
4943 DWORD opriv_size = sizeof (*old_priv);
4944 HANDLE h_token = NULL;
4945 HANDLE h_thread = GetCurrentThread ();
4946 int ret_val = 0;
4947 BOOL res;
4948
4949 res = open_thread_token (h_thread,
4950 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4951 FALSE, &h_token);
4952 if (!res && GetLastError () == ERROR_NO_TOKEN)
4953 {
4954 if (impersonate_self (SecurityImpersonation))
4955 res = open_thread_token (h_thread,
4956 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4957 FALSE, &h_token);
4958 }
4959 if (res)
4960 {
4961 priv.PrivilegeCount = 1;
4962 priv.Privileges[0].Attributes = enable_p ? SE_PRIVILEGE_ENABLED : 0;
4963 LookupPrivilegeValue (NULL, priv_name, &priv.Privileges[0].Luid);
4964 if (AdjustTokenPrivileges (h_token, FALSE, &priv, priv_size,
4965 old_priv, &opriv_size)
4966 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
4967 ret_val = 1;
4968 }
4969 if (h_token)
4970 CloseHandle (h_token);
4971
4972 return ret_val;
4973 }
4974
4975 static int
4976 restore_privilege (TOKEN_PRIVILEGES *priv)
4977 {
4978 DWORD priv_size = sizeof (*priv);
4979 HANDLE h_token = NULL;
4980 int ret_val = 0;
4981
4982 if (open_thread_token (GetCurrentThread (),
4983 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
4984 FALSE, &h_token))
4985 {
4986 if (AdjustTokenPrivileges (h_token, FALSE, priv, priv_size, NULL, NULL)
4987 && GetLastError () != ERROR_NOT_ALL_ASSIGNED)
4988 ret_val = 1;
4989 }
4990 if (h_token)
4991 CloseHandle (h_token);
4992
4993 return ret_val;
4994 }
4995
4996 static Lisp_Object
4997 ltime (ULONGLONG time_100ns)
4998 {
4999 ULONGLONG time_sec = time_100ns / 10000000;
5000 int subsec = time_100ns % 10000000;
5001 return list4 (make_number (time_sec >> 16),
5002 make_number (time_sec & 0xffff),
5003 make_number (subsec / 10),
5004 make_number (subsec % 10 * 100000));
5005 }
5006
5007 #define U64_TO_LISP_TIME(time) ltime (time)
5008
5009 static int
5010 process_times (HANDLE h_proc, Lisp_Object *ctime, Lisp_Object *etime,
5011 Lisp_Object *stime, Lisp_Object *utime, Lisp_Object *ttime,
5012 double *pcpu)
5013 {
5014 FILETIME ft_creation, ft_exit, ft_kernel, ft_user, ft_current;
5015 ULONGLONG tem1, tem2, tem3, tem;
5016
5017 if (!h_proc
5018 || !get_process_times_fn
5019 || !(*get_process_times_fn) (h_proc, &ft_creation, &ft_exit,
5020 &ft_kernel, &ft_user))
5021 return 0;
5022
5023 GetSystemTimeAsFileTime (&ft_current);
5024
5025 FILETIME_TO_U64 (tem1, ft_kernel);
5026 *stime = U64_TO_LISP_TIME (tem1);
5027
5028 FILETIME_TO_U64 (tem2, ft_user);
5029 *utime = U64_TO_LISP_TIME (tem2);
5030
5031 tem3 = tem1 + tem2;
5032 *ttime = U64_TO_LISP_TIME (tem3);
5033
5034 FILETIME_TO_U64 (tem, ft_creation);
5035 /* Process no 4 (System) returns zero creation time. */
5036 if (tem)
5037 tem -= utc_base;
5038 *ctime = U64_TO_LISP_TIME (tem);
5039
5040 if (tem)
5041 {
5042 FILETIME_TO_U64 (tem3, ft_current);
5043 tem = (tem3 - utc_base) - tem;
5044 }
5045 *etime = U64_TO_LISP_TIME (tem);
5046
5047 if (tem)
5048 {
5049 *pcpu = 100.0 * (tem1 + tem2) / tem;
5050 if (*pcpu > 100)
5051 *pcpu = 100.0;
5052 }
5053 else
5054 *pcpu = 0;
5055
5056 return 1;
5057 }
5058
5059 Lisp_Object
5060 system_process_attributes (Lisp_Object pid)
5061 {
5062 struct gcpro gcpro1, gcpro2, gcpro3;
5063 Lisp_Object attrs = Qnil;
5064 Lisp_Object cmd_str, decoded_cmd, tem;
5065 HANDLE h_snapshot, h_proc;
5066 DWORD proc_id;
5067 int found_proc = 0;
5068 char uname[UNLEN+1], gname[GNLEN+1], domain[1025];
5069 DWORD ulength = sizeof (uname), dlength = sizeof (domain), needed;
5070 DWORD glength = sizeof (gname);
5071 HANDLE token = NULL;
5072 SID_NAME_USE user_type;
5073 unsigned char *buf = NULL;
5074 DWORD blen = 0;
5075 TOKEN_USER user_token;
5076 TOKEN_PRIMARY_GROUP group_token;
5077 unsigned euid;
5078 unsigned egid;
5079 PROCESS_MEMORY_COUNTERS mem;
5080 PROCESS_MEMORY_COUNTERS_EX mem_ex;
5081 SIZE_T minrss, maxrss;
5082 MEMORYSTATUS memst;
5083 MEMORY_STATUS_EX memstex;
5084 double totphys = 0.0;
5085 Lisp_Object ctime, stime, utime, etime, ttime;
5086 double pcpu;
5087 BOOL result = FALSE;
5088
5089 CHECK_NUMBER_OR_FLOAT (pid);
5090 proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
5091
5092 h_snapshot = create_toolhelp32_snapshot (TH32CS_SNAPPROCESS, 0);
5093
5094 GCPRO3 (attrs, decoded_cmd, tem);
5095
5096 if (h_snapshot != INVALID_HANDLE_VALUE)
5097 {
5098 PROCESSENTRY32 pe;
5099 BOOL res;
5100
5101 pe.dwSize = sizeof (PROCESSENTRY32);
5102 for (res = process32_first (h_snapshot, &pe); res;
5103 res = process32_next (h_snapshot, &pe))
5104 {
5105 if (proc_id == pe.th32ProcessID)
5106 {
5107 if (proc_id == 0)
5108 decoded_cmd = build_string ("Idle");
5109 else
5110 {
5111 /* Decode the command name from locale-specific
5112 encoding. */
5113 cmd_str = make_unibyte_string (pe.szExeFile,
5114 strlen (pe.szExeFile));
5115 decoded_cmd =
5116 code_convert_string_norecord (cmd_str,
5117 Vlocale_coding_system, 0);
5118 }
5119 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
5120 attrs = Fcons (Fcons (Qppid,
5121 make_fixnum_or_float (pe.th32ParentProcessID)),
5122 attrs);
5123 attrs = Fcons (Fcons (Qpri, make_number (pe.pcPriClassBase)),
5124 attrs);
5125 attrs = Fcons (Fcons (Qthcount,
5126 make_fixnum_or_float (pe.cntThreads)),
5127 attrs);
5128 found_proc = 1;
5129 break;
5130 }
5131 }
5132
5133 CloseHandle (h_snapshot);
5134 }
5135
5136 if (!found_proc)
5137 {
5138 UNGCPRO;
5139 return Qnil;
5140 }
5141
5142 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
5143 FALSE, proc_id);
5144 /* If we were denied a handle to the process, try again after
5145 enabling the SeDebugPrivilege in our process. */
5146 if (!h_proc)
5147 {
5148 TOKEN_PRIVILEGES priv_current;
5149
5150 if (enable_privilege (SE_DEBUG_NAME, TRUE, &priv_current))
5151 {
5152 h_proc = OpenProcess (PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
5153 FALSE, proc_id);
5154 restore_privilege (&priv_current);
5155 revert_to_self ();
5156 }
5157 }
5158 if (h_proc)
5159 {
5160 result = open_process_token (h_proc, TOKEN_QUERY, &token);
5161 if (result)
5162 {
5163 result = get_token_information (token, TokenUser, NULL, 0, &blen);
5164 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
5165 {
5166 buf = xmalloc (blen);
5167 result = get_token_information (token, TokenUser,
5168 (LPVOID)buf, blen, &needed);
5169 if (result)
5170 {
5171 memcpy (&user_token, buf, sizeof (user_token));
5172 if (!w32_cached_id (user_token.User.Sid, &euid, uname))
5173 {
5174 euid = get_rid (user_token.User.Sid);
5175 result = lookup_account_sid (NULL, user_token.User.Sid,
5176 uname, &ulength,
5177 domain, &dlength,
5178 &user_type);
5179 if (result)
5180 w32_add_to_cache (user_token.User.Sid, euid, uname);
5181 else
5182 {
5183 strcpy (uname, "unknown");
5184 result = TRUE;
5185 }
5186 }
5187 ulength = strlen (uname);
5188 }
5189 }
5190 }
5191 if (result)
5192 {
5193 /* Determine a reasonable euid and gid values. */
5194 if (xstrcasecmp ("administrator", uname) == 0)
5195 {
5196 euid = 500; /* well-known Administrator uid */
5197 egid = 513; /* well-known None gid */
5198 }
5199 else
5200 {
5201 /* Get group id and name. */
5202 result = get_token_information (token, TokenPrimaryGroup,
5203 (LPVOID)buf, blen, &needed);
5204 if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
5205 {
5206 buf = xrealloc (buf, blen = needed);
5207 result = get_token_information (token, TokenPrimaryGroup,
5208 (LPVOID)buf, blen, &needed);
5209 }
5210 if (result)
5211 {
5212 memcpy (&group_token, buf, sizeof (group_token));
5213 if (!w32_cached_id (group_token.PrimaryGroup, &egid, gname))
5214 {
5215 egid = get_rid (group_token.PrimaryGroup);
5216 dlength = sizeof (domain);
5217 result =
5218 lookup_account_sid (NULL, group_token.PrimaryGroup,
5219 gname, &glength, NULL, &dlength,
5220 &user_type);
5221 if (result)
5222 w32_add_to_cache (group_token.PrimaryGroup,
5223 egid, gname);
5224 else
5225 {
5226 strcpy (gname, "None");
5227 result = TRUE;
5228 }
5229 }
5230 glength = strlen (gname);
5231 }
5232 }
5233 }
5234 xfree (buf);
5235 }
5236 if (!result)
5237 {
5238 if (!is_windows_9x ())
5239 {
5240 /* We couldn't open the process token, presumably because of
5241 insufficient access rights. Assume this process is run
5242 by the system. */
5243 strcpy (uname, "SYSTEM");
5244 strcpy (gname, "None");
5245 euid = 18; /* SYSTEM */
5246 egid = 513; /* None */
5247 glength = strlen (gname);
5248 ulength = strlen (uname);
5249 }
5250 /* If we are running under Windows 9X, where security calls are
5251 not supported, we assume all processes are run by the current
5252 user. */
5253 else if (GetUserName (uname, &ulength))
5254 {
5255 if (xstrcasecmp ("administrator", uname) == 0)
5256 euid = 0;
5257 else
5258 euid = 123;
5259 egid = euid;
5260 strcpy (gname, "None");
5261 glength = strlen (gname);
5262 ulength = strlen (uname);
5263 }
5264 else
5265 {
5266 euid = 123;
5267 egid = 123;
5268 strcpy (uname, "administrator");
5269 ulength = strlen (uname);
5270 strcpy (gname, "None");
5271 glength = strlen (gname);
5272 }
5273 if (token)
5274 CloseHandle (token);
5275 }
5276
5277 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (euid)), attrs);
5278 tem = make_unibyte_string (uname, ulength);
5279 attrs = Fcons (Fcons (Quser,
5280 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
5281 attrs);
5282 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (egid)), attrs);
5283 tem = make_unibyte_string (gname, glength);
5284 attrs = Fcons (Fcons (Qgroup,
5285 code_convert_string_norecord (tem, Vlocale_coding_system, 0)),
5286 attrs);
5287
5288 if (global_memory_status_ex (&memstex))
5289 #if __GNUC__ || (defined (_MSC_VER) && _MSC_VER >= 1300)
5290 totphys = memstex.ullTotalPhys / 1024.0;
5291 #else
5292 /* Visual Studio 6 cannot convert an unsigned __int64 type to
5293 double, so we need to do this for it... */
5294 {
5295 DWORD tot_hi = memstex.ullTotalPhys >> 32;
5296 DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffff) >> 10;
5297 DWORD tot_lo = memstex.ullTotalPhys % 1024;
5298
5299 totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
5300 }
5301 #endif /* __GNUC__ || _MSC_VER >= 1300 */
5302 else if (global_memory_status (&memst))
5303 totphys = memst.dwTotalPhys / 1024.0;
5304
5305 if (h_proc
5306 && get_process_memory_info (h_proc, (PROCESS_MEMORY_COUNTERS *)&mem_ex,
5307 sizeof (mem_ex)))
5308 {
5309 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
5310
5311 attrs = Fcons (Fcons (Qmajflt,
5312 make_fixnum_or_float (mem_ex.PageFaultCount)),
5313 attrs);
5314 attrs = Fcons (Fcons (Qvsize,
5315 make_fixnum_or_float (mem_ex.PrivateUsage / 1024)),
5316 attrs);
5317 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
5318 if (totphys)
5319 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5320 }
5321 else if (h_proc
5322 && get_process_memory_info (h_proc, &mem, sizeof (mem)))
5323 {
5324 SIZE_T rss = mem_ex.WorkingSetSize / 1024;
5325
5326 attrs = Fcons (Fcons (Qmajflt,
5327 make_fixnum_or_float (mem.PageFaultCount)),
5328 attrs);
5329 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (rss)), attrs);
5330 if (totphys)
5331 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5332 }
5333 else if (h_proc
5334 && get_process_working_set_size (h_proc, &minrss, &maxrss))
5335 {
5336 DWORD rss = maxrss / 1024;
5337
5338 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (maxrss / 1024)), attrs);
5339 if (totphys)
5340 attrs = Fcons (Fcons (Qpmem, make_float (100. * rss / totphys)), attrs);
5341 }
5342
5343 if (process_times (h_proc, &ctime, &etime, &stime, &utime, &ttime, &pcpu))
5344 {
5345 attrs = Fcons (Fcons (Qutime, utime), attrs);
5346 attrs = Fcons (Fcons (Qstime, stime), attrs);
5347 attrs = Fcons (Fcons (Qtime, ttime), attrs);
5348 attrs = Fcons (Fcons (Qstart, ctime), attrs);
5349 attrs = Fcons (Fcons (Qetime, etime), attrs);
5350 attrs = Fcons (Fcons (Qpcpu, make_float (pcpu)), attrs);
5351 }
5352
5353 /* FIXME: Retrieve command line by walking the PEB of the process. */
5354
5355 if (h_proc)
5356 CloseHandle (h_proc);
5357 UNGCPRO;
5358 return attrs;
5359 }
5360
5361 \f
5362 /* Wrappers for winsock functions to map between our file descriptors
5363 and winsock's handles; also set h_errno for convenience.
5364
5365 To allow Emacs to run on systems which don't have winsock support
5366 installed, we dynamically link to winsock on startup if present, and
5367 otherwise provide the minimum necessary functionality
5368 (eg. gethostname). */
5369
5370 /* function pointers for relevant socket functions */
5371 int (PASCAL *pfn_WSAStartup) (WORD wVersionRequired, LPWSADATA lpWSAData);
5372 void (PASCAL *pfn_WSASetLastError) (int iError);
5373 int (PASCAL *pfn_WSAGetLastError) (void);
5374 int (PASCAL *pfn_WSAEventSelect) (SOCKET s, HANDLE hEventObject, long lNetworkEvents);
5375 HANDLE (PASCAL *pfn_WSACreateEvent) (void);
5376 int (PASCAL *pfn_WSACloseEvent) (HANDLE hEvent);
5377 int (PASCAL *pfn_socket) (int af, int type, int protocol);
5378 int (PASCAL *pfn_bind) (SOCKET s, const struct sockaddr *addr, int namelen);
5379 int (PASCAL *pfn_connect) (SOCKET s, const struct sockaddr *addr, int namelen);
5380 int (PASCAL *pfn_ioctlsocket) (SOCKET s, long cmd, u_long *argp);
5381 int (PASCAL *pfn_recv) (SOCKET s, char * buf, int len, int flags);
5382 int (PASCAL *pfn_send) (SOCKET s, const char * buf, int len, int flags);
5383 int (PASCAL *pfn_closesocket) (SOCKET s);
5384 int (PASCAL *pfn_shutdown) (SOCKET s, int how);
5385 int (PASCAL *pfn_WSACleanup) (void);
5386
5387 u_short (PASCAL *pfn_htons) (u_short hostshort);
5388 u_short (PASCAL *pfn_ntohs) (u_short netshort);
5389 unsigned long (PASCAL *pfn_inet_addr) (const char * cp);
5390 int (PASCAL *pfn_gethostname) (char * name, int namelen);
5391 struct hostent * (PASCAL *pfn_gethostbyname) (const char * name);
5392 struct servent * (PASCAL *pfn_getservbyname) (const char * name, const char * proto);
5393 int (PASCAL *pfn_getpeername) (SOCKET s, struct sockaddr *addr, int * namelen);
5394 int (PASCAL *pfn_setsockopt) (SOCKET s, int level, int optname,
5395 const char * optval, int optlen);
5396 int (PASCAL *pfn_listen) (SOCKET s, int backlog);
5397 int (PASCAL *pfn_getsockname) (SOCKET s, struct sockaddr * name,
5398 int * namelen);
5399 SOCKET (PASCAL *pfn_accept) (SOCKET s, struct sockaddr * addr, int * addrlen);
5400 int (PASCAL *pfn_recvfrom) (SOCKET s, char * buf, int len, int flags,
5401 struct sockaddr * from, int * fromlen);
5402 int (PASCAL *pfn_sendto) (SOCKET s, const char * buf, int len, int flags,
5403 const struct sockaddr * to, int tolen);
5404
5405 /* SetHandleInformation is only needed to make sockets non-inheritable. */
5406 BOOL (WINAPI *pfn_SetHandleInformation) (HANDLE object, DWORD mask, DWORD flags);
5407 #ifndef HANDLE_FLAG_INHERIT
5408 #define HANDLE_FLAG_INHERIT 1
5409 #endif
5410
5411 HANDLE winsock_lib;
5412 static int winsock_inuse;
5413
5414 BOOL
5415 term_winsock (void)
5416 {
5417 if (winsock_lib != NULL && winsock_inuse == 0)
5418 {
5419 /* Not sure what would cause WSAENETDOWN, or even if it can happen
5420 after WSAStartup returns successfully, but it seems reasonable
5421 to allow unloading winsock anyway in that case. */
5422 if (pfn_WSACleanup () == 0 ||
5423 pfn_WSAGetLastError () == WSAENETDOWN)
5424 {
5425 if (FreeLibrary (winsock_lib))
5426 winsock_lib = NULL;
5427 return TRUE;
5428 }
5429 }
5430 return FALSE;
5431 }
5432
5433 BOOL
5434 init_winsock (int load_now)
5435 {
5436 WSADATA winsockData;
5437
5438 if (winsock_lib != NULL)
5439 return TRUE;
5440
5441 pfn_SetHandleInformation
5442 = (void *) GetProcAddress (GetModuleHandle ("kernel32.dll"),
5443 "SetHandleInformation");
5444
5445 winsock_lib = LoadLibrary ("Ws2_32.dll");
5446
5447 if (winsock_lib != NULL)
5448 {
5449 /* dynamically link to socket functions */
5450
5451 #define LOAD_PROC(fn) \
5452 if ((pfn_##fn = (void *) GetProcAddress (winsock_lib, #fn)) == NULL) \
5453 goto fail;
5454
5455 LOAD_PROC (WSAStartup);
5456 LOAD_PROC (WSASetLastError);
5457 LOAD_PROC (WSAGetLastError);
5458 LOAD_PROC (WSAEventSelect);
5459 LOAD_PROC (WSACreateEvent);
5460 LOAD_PROC (WSACloseEvent);
5461 LOAD_PROC (socket);
5462 LOAD_PROC (bind);
5463 LOAD_PROC (connect);
5464 LOAD_PROC (ioctlsocket);
5465 LOAD_PROC (recv);
5466 LOAD_PROC (send);
5467 LOAD_PROC (closesocket);
5468 LOAD_PROC (shutdown);
5469 LOAD_PROC (htons);
5470 LOAD_PROC (ntohs);
5471 LOAD_PROC (inet_addr);
5472 LOAD_PROC (gethostname);
5473 LOAD_PROC (gethostbyname);
5474 LOAD_PROC (getservbyname);
5475 LOAD_PROC (getpeername);
5476 LOAD_PROC (WSACleanup);
5477 LOAD_PROC (setsockopt);
5478 LOAD_PROC (listen);
5479 LOAD_PROC (getsockname);
5480 LOAD_PROC (accept);
5481 LOAD_PROC (recvfrom);
5482 LOAD_PROC (sendto);
5483 #undef LOAD_PROC
5484
5485 /* specify version 1.1 of winsock */
5486 if (pfn_WSAStartup (0x101, &winsockData) == 0)
5487 {
5488 if (winsockData.wVersion != 0x101)
5489 goto fail;
5490
5491 if (!load_now)
5492 {
5493 /* Report that winsock exists and is usable, but leave
5494 socket functions disabled. I am assuming that calling
5495 WSAStartup does not require any network interaction,
5496 and in particular does not cause or require a dial-up
5497 connection to be established. */
5498
5499 pfn_WSACleanup ();
5500 FreeLibrary (winsock_lib);
5501 winsock_lib = NULL;
5502 }
5503 winsock_inuse = 0;
5504 return TRUE;
5505 }
5506
5507 fail:
5508 FreeLibrary (winsock_lib);
5509 winsock_lib = NULL;
5510 }
5511
5512 return FALSE;
5513 }
5514
5515
5516 int h_errno = 0;
5517
5518 /* function to set h_errno for compatibility; map winsock error codes to
5519 normal system codes where they overlap (non-overlapping definitions
5520 are already in <sys/socket.h> */
5521 static void
5522 set_errno (void)
5523 {
5524 if (winsock_lib == NULL)
5525 h_errno = EINVAL;
5526 else
5527 h_errno = pfn_WSAGetLastError ();
5528
5529 switch (h_errno)
5530 {
5531 case WSAEACCES: h_errno = EACCES; break;
5532 case WSAEBADF: h_errno = EBADF; break;
5533 case WSAEFAULT: h_errno = EFAULT; break;
5534 case WSAEINTR: h_errno = EINTR; break;
5535 case WSAEINVAL: h_errno = EINVAL; break;
5536 case WSAEMFILE: h_errno = EMFILE; break;
5537 case WSAENAMETOOLONG: h_errno = ENAMETOOLONG; break;
5538 case WSAENOTEMPTY: h_errno = ENOTEMPTY; break;
5539 }
5540 errno = h_errno;
5541 }
5542
5543 static void
5544 check_errno (void)
5545 {
5546 if (h_errno == 0 && winsock_lib != NULL)
5547 pfn_WSASetLastError (0);
5548 }
5549
5550 /* Extend strerror to handle the winsock-specific error codes. */
5551 struct {
5552 int errnum;
5553 char * msg;
5554 } _wsa_errlist[] = {
5555 {WSAEINTR , "Interrupted function call"},
5556 {WSAEBADF , "Bad file descriptor"},
5557 {WSAEACCES , "Permission denied"},
5558 {WSAEFAULT , "Bad address"},
5559 {WSAEINVAL , "Invalid argument"},
5560 {WSAEMFILE , "Too many open files"},
5561
5562 {WSAEWOULDBLOCK , "Resource temporarily unavailable"},
5563 {WSAEINPROGRESS , "Operation now in progress"},
5564 {WSAEALREADY , "Operation already in progress"},
5565 {WSAENOTSOCK , "Socket operation on non-socket"},
5566 {WSAEDESTADDRREQ , "Destination address required"},
5567 {WSAEMSGSIZE , "Message too long"},
5568 {WSAEPROTOTYPE , "Protocol wrong type for socket"},
5569 {WSAENOPROTOOPT , "Bad protocol option"},
5570 {WSAEPROTONOSUPPORT , "Protocol not supported"},
5571 {WSAESOCKTNOSUPPORT , "Socket type not supported"},
5572 {WSAEOPNOTSUPP , "Operation not supported"},
5573 {WSAEPFNOSUPPORT , "Protocol family not supported"},
5574 {WSAEAFNOSUPPORT , "Address family not supported by protocol family"},
5575 {WSAEADDRINUSE , "Address already in use"},
5576 {WSAEADDRNOTAVAIL , "Cannot assign requested address"},
5577 {WSAENETDOWN , "Network is down"},
5578 {WSAENETUNREACH , "Network is unreachable"},
5579 {WSAENETRESET , "Network dropped connection on reset"},
5580 {WSAECONNABORTED , "Software caused connection abort"},
5581 {WSAECONNRESET , "Connection reset by peer"},
5582 {WSAENOBUFS , "No buffer space available"},
5583 {WSAEISCONN , "Socket is already connected"},
5584 {WSAENOTCONN , "Socket is not connected"},
5585 {WSAESHUTDOWN , "Cannot send after socket shutdown"},
5586 {WSAETOOMANYREFS , "Too many references"}, /* not sure */
5587 {WSAETIMEDOUT , "Connection timed out"},
5588 {WSAECONNREFUSED , "Connection refused"},
5589 {WSAELOOP , "Network loop"}, /* not sure */
5590 {WSAENAMETOOLONG , "Name is too long"},
5591 {WSAEHOSTDOWN , "Host is down"},
5592 {WSAEHOSTUNREACH , "No route to host"},
5593 {WSAENOTEMPTY , "Buffer not empty"}, /* not sure */
5594 {WSAEPROCLIM , "Too many processes"},
5595 {WSAEUSERS , "Too many users"}, /* not sure */
5596 {WSAEDQUOT , "Double quote in host name"}, /* really not sure */
5597 {WSAESTALE , "Data is stale"}, /* not sure */
5598 {WSAEREMOTE , "Remote error"}, /* not sure */
5599
5600 {WSASYSNOTREADY , "Network subsystem is unavailable"},
5601 {WSAVERNOTSUPPORTED , "WINSOCK.DLL version out of range"},
5602 {WSANOTINITIALISED , "Winsock not initialized successfully"},
5603 {WSAEDISCON , "Graceful shutdown in progress"},
5604 #ifdef WSAENOMORE
5605 {WSAENOMORE , "No more operations allowed"}, /* not sure */
5606 {WSAECANCELLED , "Operation cancelled"}, /* not sure */
5607 {WSAEINVALIDPROCTABLE , "Invalid procedure table from service provider"},
5608 {WSAEINVALIDPROVIDER , "Invalid service provider version number"},
5609 {WSAEPROVIDERFAILEDINIT , "Unable to initialize a service provider"},
5610 {WSASYSCALLFAILURE , "System call failure"},
5611 {WSASERVICE_NOT_FOUND , "Service not found"}, /* not sure */
5612 {WSATYPE_NOT_FOUND , "Class type not found"},
5613 {WSA_E_NO_MORE , "No more resources available"}, /* really not sure */
5614 {WSA_E_CANCELLED , "Operation already cancelled"}, /* really not sure */
5615 {WSAEREFUSED , "Operation refused"}, /* not sure */
5616 #endif
5617
5618 {WSAHOST_NOT_FOUND , "Host not found"},
5619 {WSATRY_AGAIN , "Authoritative host not found during name lookup"},
5620 {WSANO_RECOVERY , "Non-recoverable error during name lookup"},
5621 {WSANO_DATA , "Valid name, no data record of requested type"},
5622
5623 {-1, NULL}
5624 };
5625
5626 char *
5627 sys_strerror (int error_no)
5628 {
5629 int i;
5630 static char unknown_msg[40];
5631
5632 if (error_no >= 0 && error_no < sys_nerr)
5633 return sys_errlist[error_no];
5634
5635 for (i = 0; _wsa_errlist[i].errnum >= 0; i++)
5636 if (_wsa_errlist[i].errnum == error_no)
5637 return _wsa_errlist[i].msg;
5638
5639 sprintf (unknown_msg, "Unidentified error: %d", error_no);
5640 return unknown_msg;
5641 }
5642
5643 /* [andrewi 3-May-96] I've had conflicting results using both methods,
5644 but I believe the method of keeping the socket handle separate (and
5645 insuring it is not inheritable) is the correct one. */
5646
5647 #define SOCK_HANDLE(fd) ((SOCKET) fd_info[fd].hnd)
5648
5649 static int socket_to_fd (SOCKET s);
5650
5651 int
5652 sys_socket (int af, int type, int protocol)
5653 {
5654 SOCKET s;
5655
5656 if (winsock_lib == NULL)
5657 {
5658 h_errno = ENETDOWN;
5659 return INVALID_SOCKET;
5660 }
5661
5662 check_errno ();
5663
5664 /* call the real socket function */
5665 s = pfn_socket (af, type, protocol);
5666
5667 if (s != INVALID_SOCKET)
5668 return socket_to_fd (s);
5669
5670 set_errno ();
5671 return -1;
5672 }
5673
5674 /* Convert a SOCKET to a file descriptor. */
5675 static int
5676 socket_to_fd (SOCKET s)
5677 {
5678 int fd;
5679 child_process * cp;
5680
5681 /* Although under NT 3.5 _open_osfhandle will accept a socket
5682 handle, if opened with SO_OPENTYPE == SO_SYNCHRONOUS_NONALERT,
5683 that does not work under NT 3.1. However, we can get the same
5684 effect by using a backdoor function to replace an existing
5685 descriptor handle with the one we want. */
5686
5687 /* allocate a file descriptor (with appropriate flags) */
5688 fd = _open ("NUL:", _O_RDWR);
5689 if (fd >= 0)
5690 {
5691 /* Make a non-inheritable copy of the socket handle. Note
5692 that it is possible that sockets aren't actually kernel
5693 handles, which appears to be the case on Windows 9x when
5694 the MS Proxy winsock client is installed. */
5695 {
5696 /* Apparently there is a bug in NT 3.51 with some service
5697 packs, which prevents using DuplicateHandle to make a
5698 socket handle non-inheritable (causes WSACleanup to
5699 hang). The work-around is to use SetHandleInformation
5700 instead if it is available and implemented. */
5701 if (pfn_SetHandleInformation)
5702 {
5703 pfn_SetHandleInformation ((HANDLE) s, HANDLE_FLAG_INHERIT, 0);
5704 }
5705 else
5706 {
5707 HANDLE parent = GetCurrentProcess ();
5708 HANDLE new_s = INVALID_HANDLE_VALUE;
5709
5710 if (DuplicateHandle (parent,
5711 (HANDLE) s,
5712 parent,
5713 &new_s,
5714 0,
5715 FALSE,
5716 DUPLICATE_SAME_ACCESS))
5717 {
5718 /* It is possible that DuplicateHandle succeeds even
5719 though the socket wasn't really a kernel handle,
5720 because a real handle has the same value. So
5721 test whether the new handle really is a socket. */
5722 long nonblocking = 0;
5723 if (pfn_ioctlsocket ((SOCKET) new_s, FIONBIO, &nonblocking) == 0)
5724 {
5725 pfn_closesocket (s);
5726 s = (SOCKET) new_s;
5727 }
5728 else
5729 {
5730 CloseHandle (new_s);
5731 }
5732 }
5733 }
5734 }
5735 fd_info[fd].hnd = (HANDLE) s;
5736
5737 /* set our own internal flags */
5738 fd_info[fd].flags = FILE_SOCKET | FILE_BINARY | FILE_READ | FILE_WRITE;
5739
5740 cp = new_child ();
5741 if (cp)
5742 {
5743 cp->fd = fd;
5744 cp->status = STATUS_READ_ACKNOWLEDGED;
5745
5746 /* attach child_process to fd_info */
5747 if (fd_info[ fd ].cp != NULL)
5748 {
5749 DebPrint (("sys_socket: fd_info[%d] apparently in use!\n", fd));
5750 emacs_abort ();
5751 }
5752
5753 fd_info[ fd ].cp = cp;
5754
5755 /* success! */
5756 winsock_inuse++; /* count open sockets */
5757 return fd;
5758 }
5759
5760 /* clean up */
5761 _close (fd);
5762 }
5763 pfn_closesocket (s);
5764 h_errno = EMFILE;
5765 return -1;
5766 }
5767
5768 int
5769 sys_bind (int s, const struct sockaddr * addr, int namelen)
5770 {
5771 if (winsock_lib == NULL)
5772 {
5773 h_errno = ENOTSOCK;
5774 return SOCKET_ERROR;
5775 }
5776
5777 check_errno ();
5778 if (fd_info[s].flags & FILE_SOCKET)
5779 {
5780 int rc = pfn_bind (SOCK_HANDLE (s), addr, namelen);
5781 if (rc == SOCKET_ERROR)
5782 set_errno ();
5783 return rc;
5784 }
5785 h_errno = ENOTSOCK;
5786 return SOCKET_ERROR;
5787 }
5788
5789 int
5790 sys_connect (int s, const struct sockaddr * name, int namelen)
5791 {
5792 if (winsock_lib == NULL)
5793 {
5794 h_errno = ENOTSOCK;
5795 return SOCKET_ERROR;
5796 }
5797
5798 check_errno ();
5799 if (fd_info[s].flags & FILE_SOCKET)
5800 {
5801 int rc = pfn_connect (SOCK_HANDLE (s), name, namelen);
5802 if (rc == SOCKET_ERROR)
5803 set_errno ();
5804 return rc;
5805 }
5806 h_errno = ENOTSOCK;
5807 return SOCKET_ERROR;
5808 }
5809
5810 u_short
5811 sys_htons (u_short hostshort)
5812 {
5813 return (winsock_lib != NULL) ?
5814 pfn_htons (hostshort) : hostshort;
5815 }
5816
5817 u_short
5818 sys_ntohs (u_short netshort)
5819 {
5820 return (winsock_lib != NULL) ?
5821 pfn_ntohs (netshort) : netshort;
5822 }
5823
5824 unsigned long
5825 sys_inet_addr (const char * cp)
5826 {
5827 return (winsock_lib != NULL) ?
5828 pfn_inet_addr (cp) : INADDR_NONE;
5829 }
5830
5831 int
5832 sys_gethostname (char * name, int namelen)
5833 {
5834 if (winsock_lib != NULL)
5835 return pfn_gethostname (name, namelen);
5836
5837 if (namelen > MAX_COMPUTERNAME_LENGTH)
5838 return !GetComputerName (name, (DWORD *)&namelen);
5839
5840 h_errno = EFAULT;
5841 return SOCKET_ERROR;
5842 }
5843
5844 struct hostent *
5845 sys_gethostbyname (const char * name)
5846 {
5847 struct hostent * host;
5848
5849 if (winsock_lib == NULL)
5850 {
5851 h_errno = ENETDOWN;
5852 return NULL;
5853 }
5854
5855 check_errno ();
5856 host = pfn_gethostbyname (name);
5857 if (!host)
5858 set_errno ();
5859 return host;
5860 }
5861
5862 struct servent *
5863 sys_getservbyname (const char * name, const char * proto)
5864 {
5865 struct servent * serv;
5866
5867 if (winsock_lib == NULL)
5868 {
5869 h_errno = ENETDOWN;
5870 return NULL;
5871 }
5872
5873 check_errno ();
5874 serv = pfn_getservbyname (name, proto);
5875 if (!serv)
5876 set_errno ();
5877 return serv;
5878 }
5879
5880 int
5881 sys_getpeername (int s, struct sockaddr *addr, int * namelen)
5882 {
5883 if (winsock_lib == NULL)
5884 {
5885 h_errno = ENETDOWN;
5886 return SOCKET_ERROR;
5887 }
5888
5889 check_errno ();
5890 if (fd_info[s].flags & FILE_SOCKET)
5891 {
5892 int rc = pfn_getpeername (SOCK_HANDLE (s), addr, namelen);
5893 if (rc == SOCKET_ERROR)
5894 set_errno ();
5895 return rc;
5896 }
5897 h_errno = ENOTSOCK;
5898 return SOCKET_ERROR;
5899 }
5900
5901 int
5902 sys_shutdown (int s, int how)
5903 {
5904 if (winsock_lib == NULL)
5905 {
5906 h_errno = ENETDOWN;
5907 return SOCKET_ERROR;
5908 }
5909
5910 check_errno ();
5911 if (fd_info[s].flags & FILE_SOCKET)
5912 {
5913 int rc = pfn_shutdown (SOCK_HANDLE (s), how);
5914 if (rc == SOCKET_ERROR)
5915 set_errno ();
5916 return rc;
5917 }
5918 h_errno = ENOTSOCK;
5919 return SOCKET_ERROR;
5920 }
5921
5922 int
5923 sys_setsockopt (int s, int level, int optname, const void * optval, int optlen)
5924 {
5925 if (winsock_lib == NULL)
5926 {
5927 h_errno = ENETDOWN;
5928 return SOCKET_ERROR;
5929 }
5930
5931 check_errno ();
5932 if (fd_info[s].flags & FILE_SOCKET)
5933 {
5934 int rc = pfn_setsockopt (SOCK_HANDLE (s), level, optname,
5935 (const char *)optval, optlen);
5936 if (rc == SOCKET_ERROR)
5937 set_errno ();
5938 return rc;
5939 }
5940 h_errno = ENOTSOCK;
5941 return SOCKET_ERROR;
5942 }
5943
5944 int
5945 sys_listen (int s, int backlog)
5946 {
5947 if (winsock_lib == NULL)
5948 {
5949 h_errno = ENETDOWN;
5950 return SOCKET_ERROR;
5951 }
5952
5953 check_errno ();
5954 if (fd_info[s].flags & FILE_SOCKET)
5955 {
5956 int rc = pfn_listen (SOCK_HANDLE (s), backlog);
5957 if (rc == SOCKET_ERROR)
5958 set_errno ();
5959 else
5960 fd_info[s].flags |= FILE_LISTEN;
5961 return rc;
5962 }
5963 h_errno = ENOTSOCK;
5964 return SOCKET_ERROR;
5965 }
5966
5967 int
5968 sys_getsockname (int s, struct sockaddr * name, int * namelen)
5969 {
5970 if (winsock_lib == NULL)
5971 {
5972 h_errno = ENETDOWN;
5973 return SOCKET_ERROR;
5974 }
5975
5976 check_errno ();
5977 if (fd_info[s].flags & FILE_SOCKET)
5978 {
5979 int rc = pfn_getsockname (SOCK_HANDLE (s), name, namelen);
5980 if (rc == SOCKET_ERROR)
5981 set_errno ();
5982 return rc;
5983 }
5984 h_errno = ENOTSOCK;
5985 return SOCKET_ERROR;
5986 }
5987
5988 int
5989 sys_accept (int s, struct sockaddr * addr, int * addrlen)
5990 {
5991 if (winsock_lib == NULL)
5992 {
5993 h_errno = ENETDOWN;
5994 return -1;
5995 }
5996
5997 check_errno ();
5998 if (fd_info[s].flags & FILE_LISTEN)
5999 {
6000 SOCKET t = pfn_accept (SOCK_HANDLE (s), addr, addrlen);
6001 int fd = -1;
6002 if (t == INVALID_SOCKET)
6003 set_errno ();
6004 else
6005 fd = socket_to_fd (t);
6006
6007 fd_info[s].cp->status = STATUS_READ_ACKNOWLEDGED;
6008 ResetEvent (fd_info[s].cp->char_avail);
6009 return fd;
6010 }
6011 h_errno = ENOTSOCK;
6012 return -1;
6013 }
6014
6015 int
6016 sys_recvfrom (int s, char * buf, int len, int flags,
6017 struct sockaddr * from, int * fromlen)
6018 {
6019 if (winsock_lib == NULL)
6020 {
6021 h_errno = ENETDOWN;
6022 return SOCKET_ERROR;
6023 }
6024
6025 check_errno ();
6026 if (fd_info[s].flags & FILE_SOCKET)
6027 {
6028 int rc = pfn_recvfrom (SOCK_HANDLE (s), buf, len, flags, from, fromlen);
6029 if (rc == SOCKET_ERROR)
6030 set_errno ();
6031 return rc;
6032 }
6033 h_errno = ENOTSOCK;
6034 return SOCKET_ERROR;
6035 }
6036
6037 int
6038 sys_sendto (int s, const char * buf, int len, int flags,
6039 const struct sockaddr * to, int tolen)
6040 {
6041 if (winsock_lib == NULL)
6042 {
6043 h_errno = ENETDOWN;
6044 return SOCKET_ERROR;
6045 }
6046
6047 check_errno ();
6048 if (fd_info[s].flags & FILE_SOCKET)
6049 {
6050 int rc = pfn_sendto (SOCK_HANDLE (s), buf, len, flags, to, tolen);
6051 if (rc == SOCKET_ERROR)
6052 set_errno ();
6053 return rc;
6054 }
6055 h_errno = ENOTSOCK;
6056 return SOCKET_ERROR;
6057 }
6058
6059 /* Windows does not have an fcntl function. Provide an implementation
6060 solely for making sockets non-blocking. */
6061 int
6062 fcntl (int s, int cmd, int options)
6063 {
6064 if (winsock_lib == NULL)
6065 {
6066 h_errno = ENETDOWN;
6067 return -1;
6068 }
6069
6070 check_errno ();
6071 if (fd_info[s].flags & FILE_SOCKET)
6072 {
6073 if (cmd == F_SETFL && options == O_NDELAY)
6074 {
6075 unsigned long nblock = 1;
6076 int rc = pfn_ioctlsocket (SOCK_HANDLE (s), FIONBIO, &nblock);
6077 if (rc == SOCKET_ERROR)
6078 set_errno ();
6079 /* Keep track of the fact that we set this to non-blocking. */
6080 fd_info[s].flags |= FILE_NDELAY;
6081 return rc;
6082 }
6083 else
6084 {
6085 h_errno = EINVAL;
6086 return SOCKET_ERROR;
6087 }
6088 }
6089 h_errno = ENOTSOCK;
6090 return SOCKET_ERROR;
6091 }
6092
6093
6094 /* Shadow main io functions: we need to handle pipes and sockets more
6095 intelligently, and implement non-blocking mode as well. */
6096
6097 int
6098 sys_close (int fd)
6099 {
6100 int rc;
6101
6102 if (fd < 0)
6103 {
6104 errno = EBADF;
6105 return -1;
6106 }
6107
6108 if (fd < MAXDESC && fd_info[fd].cp)
6109 {
6110 child_process * cp = fd_info[fd].cp;
6111
6112 fd_info[fd].cp = NULL;
6113
6114 if (CHILD_ACTIVE (cp))
6115 {
6116 /* if last descriptor to active child_process then cleanup */
6117 int i;
6118 for (i = 0; i < MAXDESC; i++)
6119 {
6120 if (i == fd)
6121 continue;
6122 if (fd_info[i].cp == cp)
6123 break;
6124 }
6125 if (i == MAXDESC)
6126 {
6127 if (fd_info[fd].flags & FILE_SOCKET)
6128 {
6129 if (winsock_lib == NULL) emacs_abort ();
6130
6131 pfn_shutdown (SOCK_HANDLE (fd), 2);
6132 rc = pfn_closesocket (SOCK_HANDLE (fd));
6133
6134 winsock_inuse--; /* count open sockets */
6135 }
6136 delete_child (cp);
6137 }
6138 }
6139 }
6140
6141 if (fd >= 0 && fd < MAXDESC)
6142 fd_info[fd].flags = 0;
6143
6144 /* Note that sockets do not need special treatment here (at least on
6145 NT and Windows 95 using the standard tcp/ip stacks) - it appears that
6146 closesocket is equivalent to CloseHandle, which is to be expected
6147 because socket handles are fully fledged kernel handles. */
6148 rc = _close (fd);
6149
6150 return rc;
6151 }
6152
6153 int
6154 sys_dup (int fd)
6155 {
6156 int new_fd;
6157
6158 new_fd = _dup (fd);
6159 if (new_fd >= 0 && new_fd < MAXDESC)
6160 {
6161 /* duplicate our internal info as well */
6162 fd_info[new_fd] = fd_info[fd];
6163 }
6164 return new_fd;
6165 }
6166
6167 int
6168 sys_dup2 (int src, int dst)
6169 {
6170 int rc;
6171
6172 if (dst < 0 || dst >= MAXDESC)
6173 {
6174 errno = EBADF;
6175 return -1;
6176 }
6177
6178 /* make sure we close the destination first if it's a pipe or socket */
6179 if (src != dst && fd_info[dst].flags != 0)
6180 sys_close (dst);
6181
6182 rc = _dup2 (src, dst);
6183 if (rc == 0)
6184 {
6185 /* duplicate our internal info as well */
6186 fd_info[dst] = fd_info[src];
6187 }
6188 return rc;
6189 }
6190
6191 /* Unix pipe() has only one arg */
6192 int
6193 sys_pipe (int * phandles)
6194 {
6195 int rc;
6196 unsigned flags;
6197
6198 /* make pipe handles non-inheritable; when we spawn a child, we
6199 replace the relevant handle with an inheritable one. Also put
6200 pipes into binary mode; we will do text mode translation ourselves
6201 if required. */
6202 rc = _pipe (phandles, 0, _O_NOINHERIT | _O_BINARY);
6203
6204 if (rc == 0)
6205 {
6206 /* Protect against overflow, since Windows can open more handles than
6207 our fd_info array has room for. */
6208 if (phandles[0] >= MAXDESC || phandles[1] >= MAXDESC)
6209 {
6210 _close (phandles[0]);
6211 _close (phandles[1]);
6212 rc = -1;
6213 }
6214 else
6215 {
6216 flags = FILE_PIPE | FILE_READ | FILE_BINARY;
6217 fd_info[phandles[0]].flags = flags;
6218
6219 flags = FILE_PIPE | FILE_WRITE | FILE_BINARY;
6220 fd_info[phandles[1]].flags = flags;
6221 }
6222 }
6223
6224 return rc;
6225 }
6226
6227 /* Function to do blocking read of one byte, needed to implement
6228 select. It is only allowed on sockets and pipes. */
6229 int
6230 _sys_read_ahead (int fd)
6231 {
6232 child_process * cp;
6233 int rc;
6234
6235 if (fd < 0 || fd >= MAXDESC)
6236 return STATUS_READ_ERROR;
6237
6238 cp = fd_info[fd].cp;
6239
6240 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
6241 return STATUS_READ_ERROR;
6242
6243 if ((fd_info[fd].flags & (FILE_PIPE | FILE_SERIAL | FILE_SOCKET)) == 0
6244 || (fd_info[fd].flags & FILE_READ) == 0)
6245 {
6246 DebPrint (("_sys_read_ahead: internal error: fd %d is not a pipe, serial port, or socket!\n", fd));
6247 emacs_abort ();
6248 }
6249
6250 cp->status = STATUS_READ_IN_PROGRESS;
6251
6252 if (fd_info[fd].flags & FILE_PIPE)
6253 {
6254 rc = _read (fd, &cp->chr, sizeof (char));
6255
6256 /* Give subprocess time to buffer some more output for us before
6257 reporting that input is available; we need this because Windows 95
6258 connects DOS programs to pipes by making the pipe appear to be
6259 the normal console stdout - as a result most DOS programs will
6260 write to stdout without buffering, ie. one character at a
6261 time. Even some W32 programs do this - "dir" in a command
6262 shell on NT is very slow if we don't do this. */
6263 if (rc > 0)
6264 {
6265 int wait = w32_pipe_read_delay;
6266
6267 if (wait > 0)
6268 Sleep (wait);
6269 else if (wait < 0)
6270 while (++wait <= 0)
6271 /* Yield remainder of our time slice, effectively giving a
6272 temporary priority boost to the child process. */
6273 Sleep (0);
6274 }
6275 }
6276 else if (fd_info[fd].flags & FILE_SERIAL)
6277 {
6278 HANDLE hnd = fd_info[fd].hnd;
6279 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
6280 COMMTIMEOUTS ct;
6281
6282 /* Configure timeouts for blocking read. */
6283 if (!GetCommTimeouts (hnd, &ct))
6284 return STATUS_READ_ERROR;
6285 ct.ReadIntervalTimeout = 0;
6286 ct.ReadTotalTimeoutMultiplier = 0;
6287 ct.ReadTotalTimeoutConstant = 0;
6288 if (!SetCommTimeouts (hnd, &ct))
6289 return STATUS_READ_ERROR;
6290
6291 if (!ReadFile (hnd, &cp->chr, sizeof (char), (DWORD*) &rc, ovl))
6292 {
6293 if (GetLastError () != ERROR_IO_PENDING)
6294 return STATUS_READ_ERROR;
6295 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
6296 return STATUS_READ_ERROR;
6297 }
6298 }
6299 else if (fd_info[fd].flags & FILE_SOCKET)
6300 {
6301 unsigned long nblock = 0;
6302 /* We always want this to block, so temporarily disable NDELAY. */
6303 if (fd_info[fd].flags & FILE_NDELAY)
6304 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6305
6306 rc = pfn_recv (SOCK_HANDLE (fd), &cp->chr, sizeof (char), 0);
6307
6308 if (fd_info[fd].flags & FILE_NDELAY)
6309 {
6310 nblock = 1;
6311 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6312 }
6313 }
6314
6315 if (rc == sizeof (char))
6316 cp->status = STATUS_READ_SUCCEEDED;
6317 else
6318 cp->status = STATUS_READ_FAILED;
6319
6320 return cp->status;
6321 }
6322
6323 int
6324 _sys_wait_accept (int fd)
6325 {
6326 HANDLE hEv;
6327 child_process * cp;
6328 int rc;
6329
6330 if (fd < 0 || fd >= MAXDESC)
6331 return STATUS_READ_ERROR;
6332
6333 cp = fd_info[fd].cp;
6334
6335 if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
6336 return STATUS_READ_ERROR;
6337
6338 cp->status = STATUS_READ_FAILED;
6339
6340 hEv = pfn_WSACreateEvent ();
6341 rc = pfn_WSAEventSelect (SOCK_HANDLE (fd), hEv, FD_ACCEPT);
6342 if (rc != SOCKET_ERROR)
6343 {
6344 rc = WaitForSingleObject (hEv, INFINITE);
6345 pfn_WSAEventSelect (SOCK_HANDLE (fd), NULL, 0);
6346 if (rc == WAIT_OBJECT_0)
6347 cp->status = STATUS_READ_SUCCEEDED;
6348 }
6349 pfn_WSACloseEvent (hEv);
6350
6351 return cp->status;
6352 }
6353
6354 int
6355 sys_read (int fd, char * buffer, unsigned int count)
6356 {
6357 int nchars;
6358 int to_read;
6359 DWORD waiting;
6360 char * orig_buffer = buffer;
6361
6362 if (fd < 0)
6363 {
6364 errno = EBADF;
6365 return -1;
6366 }
6367
6368 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
6369 {
6370 child_process *cp = fd_info[fd].cp;
6371
6372 if ((fd_info[fd].flags & FILE_READ) == 0)
6373 {
6374 errno = EBADF;
6375 return -1;
6376 }
6377
6378 nchars = 0;
6379
6380 /* re-read CR carried over from last read */
6381 if (fd_info[fd].flags & FILE_LAST_CR)
6382 {
6383 if (fd_info[fd].flags & FILE_BINARY) emacs_abort ();
6384 *buffer++ = 0x0d;
6385 count--;
6386 nchars++;
6387 fd_info[fd].flags &= ~FILE_LAST_CR;
6388 }
6389
6390 /* presence of a child_process structure means we are operating in
6391 non-blocking mode - otherwise we just call _read directly.
6392 Note that the child_process structure might be missing because
6393 reap_subprocess has been called; in this case the pipe is
6394 already broken, so calling _read on it is okay. */
6395 if (cp)
6396 {
6397 int current_status = cp->status;
6398
6399 switch (current_status)
6400 {
6401 case STATUS_READ_FAILED:
6402 case STATUS_READ_ERROR:
6403 /* report normal EOF if nothing in buffer */
6404 if (nchars <= 0)
6405 fd_info[fd].flags |= FILE_AT_EOF;
6406 return nchars;
6407
6408 case STATUS_READ_READY:
6409 case STATUS_READ_IN_PROGRESS:
6410 DebPrint (("sys_read called when read is in progress\n"));
6411 errno = EWOULDBLOCK;
6412 return -1;
6413
6414 case STATUS_READ_SUCCEEDED:
6415 /* consume read-ahead char */
6416 *buffer++ = cp->chr;
6417 count--;
6418 nchars++;
6419 cp->status = STATUS_READ_ACKNOWLEDGED;
6420 ResetEvent (cp->char_avail);
6421
6422 case STATUS_READ_ACKNOWLEDGED:
6423 break;
6424
6425 default:
6426 DebPrint (("sys_read: bad status %d\n", current_status));
6427 errno = EBADF;
6428 return -1;
6429 }
6430
6431 if (fd_info[fd].flags & FILE_PIPE)
6432 {
6433 PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
6434 to_read = min (waiting, (DWORD) count);
6435
6436 if (to_read > 0)
6437 nchars += _read (fd, buffer, to_read);
6438 }
6439 else if (fd_info[fd].flags & FILE_SERIAL)
6440 {
6441 HANDLE hnd = fd_info[fd].hnd;
6442 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_read;
6443 int rc = 0;
6444 COMMTIMEOUTS ct;
6445
6446 if (count > 0)
6447 {
6448 /* Configure timeouts for non-blocking read. */
6449 if (!GetCommTimeouts (hnd, &ct))
6450 {
6451 errno = EIO;
6452 return -1;
6453 }
6454 ct.ReadIntervalTimeout = MAXDWORD;
6455 ct.ReadTotalTimeoutMultiplier = 0;
6456 ct.ReadTotalTimeoutConstant = 0;
6457 if (!SetCommTimeouts (hnd, &ct))
6458 {
6459 errno = EIO;
6460 return -1;
6461 }
6462
6463 if (!ResetEvent (ovl->hEvent))
6464 {
6465 errno = EIO;
6466 return -1;
6467 }
6468 if (!ReadFile (hnd, buffer, count, (DWORD*) &rc, ovl))
6469 {
6470 if (GetLastError () != ERROR_IO_PENDING)
6471 {
6472 errno = EIO;
6473 return -1;
6474 }
6475 if (!GetOverlappedResult (hnd, ovl, (DWORD*) &rc, TRUE))
6476 {
6477 errno = EIO;
6478 return -1;
6479 }
6480 }
6481 nchars += rc;
6482 }
6483 }
6484 else /* FILE_SOCKET */
6485 {
6486 if (winsock_lib == NULL) emacs_abort ();
6487
6488 /* do the equivalent of a non-blocking read */
6489 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONREAD, &waiting);
6490 if (waiting == 0 && nchars == 0)
6491 {
6492 h_errno = errno = EWOULDBLOCK;
6493 return -1;
6494 }
6495
6496 if (waiting)
6497 {
6498 /* always use binary mode for sockets */
6499 int res = pfn_recv (SOCK_HANDLE (fd), buffer, count, 0);
6500 if (res == SOCKET_ERROR)
6501 {
6502 DebPrint (("sys_read.recv failed with error %d on socket %ld\n",
6503 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
6504 set_errno ();
6505 return -1;
6506 }
6507 nchars += res;
6508 }
6509 }
6510 }
6511 else
6512 {
6513 int nread = _read (fd, buffer, count);
6514 if (nread >= 0)
6515 nchars += nread;
6516 else if (nchars == 0)
6517 nchars = nread;
6518 }
6519
6520 if (nchars <= 0)
6521 fd_info[fd].flags |= FILE_AT_EOF;
6522 /* Perform text mode translation if required. */
6523 else if ((fd_info[fd].flags & FILE_BINARY) == 0)
6524 {
6525 nchars = crlf_to_lf (nchars, orig_buffer);
6526 /* If buffer contains only CR, return that. To be absolutely
6527 sure we should attempt to read the next char, but in
6528 practice a CR to be followed by LF would not appear by
6529 itself in the buffer. */
6530 if (nchars > 1 && orig_buffer[nchars - 1] == 0x0d)
6531 {
6532 fd_info[fd].flags |= FILE_LAST_CR;
6533 nchars--;
6534 }
6535 }
6536 }
6537 else
6538 nchars = _read (fd, buffer, count);
6539
6540 return nchars;
6541 }
6542
6543 /* From w32xfns.c */
6544 extern HANDLE interrupt_handle;
6545
6546 /* For now, don't bother with a non-blocking mode */
6547 int
6548 sys_write (int fd, const void * buffer, unsigned int count)
6549 {
6550 int nchars;
6551
6552 if (fd < 0)
6553 {
6554 errno = EBADF;
6555 return -1;
6556 }
6557
6558 if (fd < MAXDESC && fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET | FILE_SERIAL))
6559 {
6560 if ((fd_info[fd].flags & FILE_WRITE) == 0)
6561 {
6562 errno = EBADF;
6563 return -1;
6564 }
6565
6566 /* Perform text mode translation if required. */
6567 if ((fd_info[fd].flags & FILE_BINARY) == 0)
6568 {
6569 char * tmpbuf = alloca (count * 2);
6570 unsigned char * src = (void *)buffer;
6571 unsigned char * dst = tmpbuf;
6572 int nbytes = count;
6573
6574 while (1)
6575 {
6576 unsigned char *next;
6577 /* copy next line or remaining bytes */
6578 next = _memccpy (dst, src, '\n', nbytes);
6579 if (next)
6580 {
6581 /* copied one line ending with '\n' */
6582 int copied = next - dst;
6583 nbytes -= copied;
6584 src += copied;
6585 /* insert '\r' before '\n' */
6586 next[-1] = '\r';
6587 next[0] = '\n';
6588 dst = next + 1;
6589 count++;
6590 }
6591 else
6592 /* copied remaining partial line -> now finished */
6593 break;
6594 }
6595 buffer = tmpbuf;
6596 }
6597 }
6598
6599 if (fd < MAXDESC && fd_info[fd].flags & FILE_SERIAL)
6600 {
6601 HANDLE hnd = (HANDLE) _get_osfhandle (fd);
6602 OVERLAPPED *ovl = &fd_info[fd].cp->ovl_write;
6603 HANDLE wait_hnd[2] = { interrupt_handle, ovl->hEvent };
6604 DWORD active = 0;
6605
6606 if (!WriteFile (hnd, buffer, count, (DWORD*) &nchars, ovl))
6607 {
6608 if (GetLastError () != ERROR_IO_PENDING)
6609 {
6610 errno = EIO;
6611 return -1;
6612 }
6613 if (detect_input_pending ())
6614 active = MsgWaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE,
6615 QS_ALLINPUT);
6616 else
6617 active = WaitForMultipleObjects (2, wait_hnd, FALSE, INFINITE);
6618 if (active == WAIT_OBJECT_0)
6619 { /* User pressed C-g, cancel write, then leave. Don't bother
6620 cleaning up as we may only get stuck in buggy drivers. */
6621 PurgeComm (hnd, PURGE_TXABORT | PURGE_TXCLEAR);
6622 CancelIo (hnd);
6623 errno = EIO;
6624 return -1;
6625 }
6626 if (active == WAIT_OBJECT_0 + 1
6627 && !GetOverlappedResult (hnd, ovl, (DWORD*) &nchars, TRUE))
6628 {
6629 errno = EIO;
6630 return -1;
6631 }
6632 }
6633 }
6634 else if (fd < MAXDESC && fd_info[fd].flags & FILE_SOCKET)
6635 {
6636 unsigned long nblock = 0;
6637 if (winsock_lib == NULL) emacs_abort ();
6638
6639 /* TODO: implement select() properly so non-blocking I/O works. */
6640 /* For now, make sure the write blocks. */
6641 if (fd_info[fd].flags & FILE_NDELAY)
6642 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6643
6644 nchars = pfn_send (SOCK_HANDLE (fd), buffer, count, 0);
6645
6646 /* Set the socket back to non-blocking if it was before,
6647 for other operations that support it. */
6648 if (fd_info[fd].flags & FILE_NDELAY)
6649 {
6650 nblock = 1;
6651 pfn_ioctlsocket (SOCK_HANDLE (fd), FIONBIO, &nblock);
6652 }
6653
6654 if (nchars == SOCKET_ERROR)
6655 {
6656 DebPrint (("sys_write.send failed with error %d on socket %ld\n",
6657 pfn_WSAGetLastError (), SOCK_HANDLE (fd)));
6658 set_errno ();
6659 }
6660 }
6661 else
6662 {
6663 /* Some networked filesystems don't like too large writes, so
6664 break them into smaller chunks. See the Comments section of
6665 the MSDN documentation of WriteFile for details behind the
6666 choice of the value of CHUNK below. See also the thread
6667 http://thread.gmane.org/gmane.comp.version-control.git/145294
6668 in the git mailing list. */
6669 const unsigned char *p = buffer;
6670 const unsigned chunk = 30 * 1024 * 1024;
6671
6672 nchars = 0;
6673 while (count > 0)
6674 {
6675 unsigned this_chunk = count < chunk ? count : chunk;
6676 int n = _write (fd, p, this_chunk);
6677
6678 nchars += n;
6679 if (n < 0)
6680 {
6681 nchars = n;
6682 break;
6683 }
6684 else if (n < this_chunk)
6685 break;
6686 count -= n;
6687 p += n;
6688 }
6689 }
6690
6691 return nchars;
6692 }
6693
6694 /* The Windows CRT functions are "optimized for speed", so they don't
6695 check for timezone and DST changes if they were last called less
6696 than 1 minute ago (see http://support.microsoft.com/kb/821231). So
6697 all Emacs features that repeatedly call time functions (e.g.,
6698 display-time) are in real danger of missing timezone and DST
6699 changes. Calling tzset before each localtime call fixes that. */
6700 struct tm *
6701 sys_localtime (const time_t *t)
6702 {
6703 tzset ();
6704 return localtime (t);
6705 }
6706
6707
6708 \f
6709 /* Try loading LIBRARY_ID from the file(s) specified in
6710 Vdynamic_library_alist. If the library is loaded successfully,
6711 return the handle of the DLL, and record the filename in the
6712 property :loaded-from of LIBRARY_ID. If the library could not be
6713 found, or when it was already loaded (because the handle is not
6714 recorded anywhere, and so is lost after use), return NULL.
6715
6716 We could also save the handle in :loaded-from, but currently
6717 there's no use case for it. */
6718 HMODULE
6719 w32_delayed_load (Lisp_Object library_id)
6720 {
6721 HMODULE library_dll = NULL;
6722
6723 CHECK_SYMBOL (library_id);
6724
6725 if (CONSP (Vdynamic_library_alist)
6726 && NILP (Fassq (library_id, Vlibrary_cache)))
6727 {
6728 Lisp_Object found = Qnil;
6729 Lisp_Object dlls = Fassq (library_id, Vdynamic_library_alist);
6730
6731 if (CONSP (dlls))
6732 for (dlls = XCDR (dlls); CONSP (dlls); dlls = XCDR (dlls))
6733 {
6734 CHECK_STRING_CAR (dlls);
6735 if ((library_dll = LoadLibrary (SDATA (XCAR (dlls)))))
6736 {
6737 char name[MAX_PATH];
6738 DWORD len;
6739
6740 len = GetModuleFileNameA (library_dll, name, sizeof (name));
6741 found = Fcons (XCAR (dlls),
6742 (len > 0)
6743 /* Possibly truncated */
6744 ? make_specified_string (name, -1, len, 1)
6745 : Qnil);
6746 break;
6747 }
6748 }
6749
6750 Fput (library_id, QCloaded_from, found);
6751 }
6752
6753 return library_dll;
6754 }
6755
6756 \f
6757 void
6758 check_windows_init_file (void)
6759 {
6760 /* A common indication that Emacs is not installed properly is when
6761 it cannot find the Windows installation file. If this file does
6762 not exist in the expected place, tell the user. */
6763
6764 if (!noninteractive && !inhibit_window_system
6765 /* Vload_path is not yet initialized when we are loading
6766 loadup.el. */
6767 && NILP (Vpurify_flag))
6768 {
6769 Lisp_Object init_file;
6770 int fd;
6771
6772 init_file = build_string ("term/w32-win");
6773 fd = openp (Vload_path, init_file, Fget_load_suffixes (), NULL, Qnil);
6774 if (fd < 0)
6775 {
6776 Lisp_Object load_path_print = Fprin1_to_string (Vload_path, Qnil);
6777 char *init_file_name = SDATA (init_file);
6778 char *load_path = SDATA (load_path_print);
6779 char *buffer = alloca (1024
6780 + strlen (init_file_name)
6781 + strlen (load_path));
6782
6783 sprintf (buffer,
6784 "The Emacs Windows initialization file \"%s.el\" "
6785 "could not be found in your Emacs installation. "
6786 "Emacs checked the following directories for this file:\n"
6787 "\n%s\n\n"
6788 "When Emacs cannot find this file, it usually means that it "
6789 "was not installed properly, or its distribution file was "
6790 "not unpacked properly.\nSee the README.W32 file in the "
6791 "top-level Emacs directory for more information.",
6792 init_file_name, load_path);
6793 MessageBox (NULL,
6794 buffer,
6795 "Emacs Abort Dialog",
6796 MB_OK | MB_ICONEXCLAMATION | MB_TASKMODAL);
6797 /* Use the low-level system abort. */
6798 abort ();
6799 }
6800 else
6801 {
6802 _close (fd);
6803 }
6804 }
6805 }
6806
6807 void
6808 term_ntproc (int ignored)
6809 {
6810 (void)ignored;
6811
6812 term_timers ();
6813
6814 /* shutdown the socket interface if necessary */
6815 term_winsock ();
6816
6817 term_w32select ();
6818 }
6819
6820 void
6821 init_ntproc (int dumping)
6822 {
6823 sigset_t initial_mask = 0;
6824
6825 /* Initialize the socket interface now if available and requested by
6826 the user by defining PRELOAD_WINSOCK; otherwise loading will be
6827 delayed until open-network-stream is called (w32-has-winsock can
6828 also be used to dynamically load or reload winsock).
6829
6830 Conveniently, init_environment is called before us, so
6831 PRELOAD_WINSOCK can be set in the registry. */
6832
6833 /* Always initialize this correctly. */
6834 winsock_lib = NULL;
6835
6836 if (getenv ("PRELOAD_WINSOCK") != NULL)
6837 init_winsock (TRUE);
6838
6839 /* Initial preparation for subprocess support: replace our standard
6840 handles with non-inheritable versions. */
6841 {
6842 HANDLE parent;
6843 HANDLE stdin_save = INVALID_HANDLE_VALUE;
6844 HANDLE stdout_save = INVALID_HANDLE_VALUE;
6845 HANDLE stderr_save = INVALID_HANDLE_VALUE;
6846
6847 parent = GetCurrentProcess ();
6848
6849 /* ignore errors when duplicating and closing; typically the
6850 handles will be invalid when running as a gui program. */
6851 DuplicateHandle (parent,
6852 GetStdHandle (STD_INPUT_HANDLE),
6853 parent,
6854 &stdin_save,
6855 0,
6856 FALSE,
6857 DUPLICATE_SAME_ACCESS);
6858
6859 DuplicateHandle (parent,
6860 GetStdHandle (STD_OUTPUT_HANDLE),
6861 parent,
6862 &stdout_save,
6863 0,
6864 FALSE,
6865 DUPLICATE_SAME_ACCESS);
6866
6867 DuplicateHandle (parent,
6868 GetStdHandle (STD_ERROR_HANDLE),
6869 parent,
6870 &stderr_save,
6871 0,
6872 FALSE,
6873 DUPLICATE_SAME_ACCESS);
6874
6875 fclose (stdin);
6876 fclose (stdout);
6877 fclose (stderr);
6878
6879 if (stdin_save != INVALID_HANDLE_VALUE)
6880 _open_osfhandle ((intptr_t) stdin_save, O_TEXT);
6881 else
6882 _open ("nul", O_TEXT | O_NOINHERIT | O_RDONLY);
6883 _fdopen (0, "r");
6884
6885 if (stdout_save != INVALID_HANDLE_VALUE)
6886 _open_osfhandle ((intptr_t) stdout_save, O_TEXT);
6887 else
6888 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
6889 _fdopen (1, "w");
6890
6891 if (stderr_save != INVALID_HANDLE_VALUE)
6892 _open_osfhandle ((intptr_t) stderr_save, O_TEXT);
6893 else
6894 _open ("nul", O_TEXT | O_NOINHERIT | O_WRONLY);
6895 _fdopen (2, "w");
6896 }
6897
6898 /* unfortunately, atexit depends on implementation of malloc */
6899 /* atexit (term_ntproc); */
6900 if (!dumping)
6901 {
6902 /* Make sure we start with all signals unblocked. */
6903 sigprocmask (SIG_SETMASK, &initial_mask, NULL);
6904 signal (SIGABRT, term_ntproc);
6905 }
6906 init_timers ();
6907
6908 /* determine which drives are fixed, for GetCachedVolumeInformation */
6909 {
6910 /* GetDriveType must have trailing backslash. */
6911 char drive[] = "A:\\";
6912
6913 /* Loop over all possible drive letters */
6914 while (*drive <= 'Z')
6915 {
6916 /* Record if this drive letter refers to a fixed drive. */
6917 fixed_drives[DRIVE_INDEX (*drive)] =
6918 (GetDriveType (drive) == DRIVE_FIXED);
6919
6920 (*drive)++;
6921 }
6922
6923 /* Reset the volume info cache. */
6924 volume_cache = NULL;
6925 }
6926 }
6927
6928 /*
6929 shutdown_handler ensures that buffers' autosave files are
6930 up to date when the user logs off, or the system shuts down.
6931 */
6932 static BOOL WINAPI
6933 shutdown_handler (DWORD type)
6934 {
6935 /* Ctrl-C and Ctrl-Break are already suppressed, so don't handle them. */
6936 if (type == CTRL_CLOSE_EVENT /* User closes console window. */
6937 || type == CTRL_LOGOFF_EVENT /* User logs off. */
6938 || type == CTRL_SHUTDOWN_EVENT) /* User shutsdown. */
6939 {
6940 /* Shut down cleanly, making sure autosave files are up to date. */
6941 shut_down_emacs (0, Qnil);
6942 }
6943
6944 /* Allow other handlers to handle this signal. */
6945 return FALSE;
6946 }
6947
6948 /*
6949 globals_of_w32 is used to initialize those global variables that
6950 must always be initialized on startup even when the global variable
6951 initialized is non zero (see the function main in emacs.c).
6952 */
6953 void
6954 globals_of_w32 (void)
6955 {
6956 HMODULE kernel32 = GetModuleHandle ("kernel32.dll");
6957
6958 get_process_times_fn = (GetProcessTimes_Proc)
6959 GetProcAddress (kernel32, "GetProcessTimes");
6960
6961 DEFSYM (QCloaded_from, ":loaded-from");
6962
6963 g_b_init_is_windows_9x = 0;
6964 g_b_init_open_process_token = 0;
6965 g_b_init_get_token_information = 0;
6966 g_b_init_lookup_account_sid = 0;
6967 g_b_init_get_sid_sub_authority = 0;
6968 g_b_init_get_sid_sub_authority_count = 0;
6969 g_b_init_get_security_info = 0;
6970 g_b_init_get_file_security = 0;
6971 g_b_init_get_security_descriptor_owner = 0;
6972 g_b_init_get_security_descriptor_group = 0;
6973 g_b_init_is_valid_sid = 0;
6974 g_b_init_create_toolhelp32_snapshot = 0;
6975 g_b_init_process32_first = 0;
6976 g_b_init_process32_next = 0;
6977 g_b_init_open_thread_token = 0;
6978 g_b_init_impersonate_self = 0;
6979 g_b_init_revert_to_self = 0;
6980 g_b_init_get_process_memory_info = 0;
6981 g_b_init_get_process_working_set_size = 0;
6982 g_b_init_global_memory_status = 0;
6983 g_b_init_global_memory_status_ex = 0;
6984 g_b_init_equal_sid = 0;
6985 g_b_init_copy_sid = 0;
6986 g_b_init_get_length_sid = 0;
6987 g_b_init_get_native_system_info = 0;
6988 g_b_init_get_system_times = 0;
6989 g_b_init_create_symbolic_link = 0;
6990 num_of_processors = 0;
6991 /* The following sets a handler for shutdown notifications for
6992 console apps. This actually applies to Emacs in both console and
6993 GUI modes, since we had to fool windows into thinking emacs is a
6994 console application to get console mode to work. */
6995 SetConsoleCtrlHandler (shutdown_handler, TRUE);
6996
6997 /* "None" is the default group name on standalone workstations. */
6998 strcpy (dflt_group_name, "None");
6999 }
7000
7001 /* For make-serial-process */
7002 int
7003 serial_open (char *port)
7004 {
7005 HANDLE hnd;
7006 child_process *cp;
7007 int fd = -1;
7008
7009 hnd = CreateFile (port, GENERIC_READ | GENERIC_WRITE, 0, 0,
7010 OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
7011 if (hnd == INVALID_HANDLE_VALUE)
7012 error ("Could not open %s", port);
7013 fd = (int) _open_osfhandle ((intptr_t) hnd, 0);
7014 if (fd == -1)
7015 error ("Could not open %s", port);
7016
7017 cp = new_child ();
7018 if (!cp)
7019 error ("Could not create child process");
7020 cp->fd = fd;
7021 cp->status = STATUS_READ_ACKNOWLEDGED;
7022 fd_info[ fd ].hnd = hnd;
7023 fd_info[ fd ].flags |=
7024 FILE_READ | FILE_WRITE | FILE_BINARY | FILE_SERIAL;
7025 if (fd_info[ fd ].cp != NULL)
7026 {
7027 error ("fd_info[fd = %d] is already in use", fd);
7028 }
7029 fd_info[ fd ].cp = cp;
7030 cp->ovl_read.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
7031 if (cp->ovl_read.hEvent == NULL)
7032 error ("Could not create read event");
7033 cp->ovl_write.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
7034 if (cp->ovl_write.hEvent == NULL)
7035 error ("Could not create write event");
7036
7037 return fd;
7038 }
7039
7040 /* For serial-process-configure */
7041 void
7042 serial_configure (struct Lisp_Process *p, Lisp_Object contact)
7043 {
7044 Lisp_Object childp2 = Qnil;
7045 Lisp_Object tem = Qnil;
7046 HANDLE hnd;
7047 DCB dcb;
7048 COMMTIMEOUTS ct;
7049 char summary[4] = "???"; /* This usually becomes "8N1". */
7050
7051 if ((fd_info[ p->outfd ].flags & FILE_SERIAL) == 0)
7052 error ("Not a serial process");
7053 hnd = fd_info[ p->outfd ].hnd;
7054
7055 childp2 = Fcopy_sequence (p->childp);
7056
7057 /* Initialize timeouts for blocking read and blocking write. */
7058 if (!GetCommTimeouts (hnd, &ct))
7059 error ("GetCommTimeouts() failed");
7060 ct.ReadIntervalTimeout = 0;
7061 ct.ReadTotalTimeoutMultiplier = 0;
7062 ct.ReadTotalTimeoutConstant = 0;
7063 ct.WriteTotalTimeoutMultiplier = 0;
7064 ct.WriteTotalTimeoutConstant = 0;
7065 if (!SetCommTimeouts (hnd, &ct))
7066 error ("SetCommTimeouts() failed");
7067 /* Read port attributes and prepare default configuration. */
7068 memset (&dcb, 0, sizeof (dcb));
7069 dcb.DCBlength = sizeof (DCB);
7070 if (!GetCommState (hnd, &dcb))
7071 error ("GetCommState() failed");
7072 dcb.fBinary = TRUE;
7073 dcb.fNull = FALSE;
7074 dcb.fAbortOnError = FALSE;
7075 /* dcb.XonLim and dcb.XoffLim are set by GetCommState() */
7076 dcb.ErrorChar = 0;
7077 dcb.EofChar = 0;
7078 dcb.EvtChar = 0;
7079
7080 /* Configure speed. */
7081 if (!NILP (Fplist_member (contact, QCspeed)))
7082 tem = Fplist_get (contact, QCspeed);
7083 else
7084 tem = Fplist_get (p->childp, QCspeed);
7085 CHECK_NUMBER (tem);
7086 dcb.BaudRate = XINT (tem);
7087 childp2 = Fplist_put (childp2, QCspeed, tem);
7088
7089 /* Configure bytesize. */
7090 if (!NILP (Fplist_member (contact, QCbytesize)))
7091 tem = Fplist_get (contact, QCbytesize);
7092 else
7093 tem = Fplist_get (p->childp, QCbytesize);
7094 if (NILP (tem))
7095 tem = make_number (8);
7096 CHECK_NUMBER (tem);
7097 if (XINT (tem) != 7 && XINT (tem) != 8)
7098 error (":bytesize must be nil (8), 7, or 8");
7099 dcb.ByteSize = XINT (tem);
7100 summary[0] = XINT (tem) + '0';
7101 childp2 = Fplist_put (childp2, QCbytesize, tem);
7102
7103 /* Configure parity. */
7104 if (!NILP (Fplist_member (contact, QCparity)))
7105 tem = Fplist_get (contact, QCparity);
7106 else
7107 tem = Fplist_get (p->childp, QCparity);
7108 if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
7109 error (":parity must be nil (no parity), `even', or `odd'");
7110 dcb.fParity = FALSE;
7111 dcb.Parity = NOPARITY;
7112 dcb.fErrorChar = FALSE;
7113 if (NILP (tem))
7114 {
7115 summary[1] = 'N';
7116 }
7117 else if (EQ (tem, Qeven))
7118 {
7119 summary[1] = 'E';
7120 dcb.fParity = TRUE;
7121 dcb.Parity = EVENPARITY;
7122 dcb.fErrorChar = TRUE;
7123 }
7124 else if (EQ (tem, Qodd))
7125 {
7126 summary[1] = 'O';
7127 dcb.fParity = TRUE;
7128 dcb.Parity = ODDPARITY;
7129 dcb.fErrorChar = TRUE;
7130 }
7131 childp2 = Fplist_put (childp2, QCparity, tem);
7132
7133 /* Configure stopbits. */
7134 if (!NILP (Fplist_member (contact, QCstopbits)))
7135 tem = Fplist_get (contact, QCstopbits);
7136 else
7137 tem = Fplist_get (p->childp, QCstopbits);
7138 if (NILP (tem))
7139 tem = make_number (1);
7140 CHECK_NUMBER (tem);
7141 if (XINT (tem) != 1 && XINT (tem) != 2)
7142 error (":stopbits must be nil (1 stopbit), 1, or 2");
7143 summary[2] = XINT (tem) + '0';
7144 if (XINT (tem) == 1)
7145 dcb.StopBits = ONESTOPBIT;
7146 else if (XINT (tem) == 2)
7147 dcb.StopBits = TWOSTOPBITS;
7148 childp2 = Fplist_put (childp2, QCstopbits, tem);
7149
7150 /* Configure flowcontrol. */
7151 if (!NILP (Fplist_member (contact, QCflowcontrol)))
7152 tem = Fplist_get (contact, QCflowcontrol);
7153 else
7154 tem = Fplist_get (p->childp, QCflowcontrol);
7155 if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
7156 error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
7157 dcb.fOutxCtsFlow = FALSE;
7158 dcb.fOutxDsrFlow = FALSE;
7159 dcb.fDtrControl = DTR_CONTROL_DISABLE;
7160 dcb.fDsrSensitivity = FALSE;
7161 dcb.fTXContinueOnXoff = FALSE;
7162 dcb.fOutX = FALSE;
7163 dcb.fInX = FALSE;
7164 dcb.fRtsControl = RTS_CONTROL_DISABLE;
7165 dcb.XonChar = 17; /* Control-Q */
7166 dcb.XoffChar = 19; /* Control-S */
7167 if (NILP (tem))
7168 {
7169 /* Already configured. */
7170 }
7171 else if (EQ (tem, Qhw))
7172 {
7173 dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
7174 dcb.fOutxCtsFlow = TRUE;
7175 }
7176 else if (EQ (tem, Qsw))
7177 {
7178 dcb.fOutX = TRUE;
7179 dcb.fInX = TRUE;
7180 }
7181 childp2 = Fplist_put (childp2, QCflowcontrol, tem);
7182
7183 /* Activate configuration. */
7184 if (!SetCommState (hnd, &dcb))
7185 error ("SetCommState() failed");
7186
7187 childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
7188 pset_childp (p, childp2);
7189 }
7190
7191 #ifdef HAVE_GNUTLS
7192
7193 ssize_t
7194 emacs_gnutls_pull (gnutls_transport_ptr_t p, void* buf, size_t sz)
7195 {
7196 int n, sc, err;
7197 SELECT_TYPE fdset;
7198 EMACS_TIME timeout;
7199 struct Lisp_Process *process = (struct Lisp_Process *)p;
7200 int fd = process->infd;
7201
7202 for (;;)
7203 {
7204 n = sys_read (fd, (char*)buf, sz);
7205
7206 if (n >= 0)
7207 return n;
7208
7209 err = errno;
7210
7211 if (err == EWOULDBLOCK)
7212 {
7213 /* Set a small timeout. */
7214 timeout = make_emacs_time (1, 0);
7215 FD_ZERO (&fdset);
7216 FD_SET ((int)fd, &fdset);
7217
7218 /* Use select with the timeout to poll the selector. */
7219 sc = select (fd + 1, &fdset, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
7220 &timeout, NULL);
7221
7222 if (sc > 0)
7223 continue; /* Try again. */
7224
7225 /* Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN.
7226 Also accept select return 0 as an indicator to EAGAIN. */
7227 if (sc == 0 || errno == EWOULDBLOCK)
7228 err = EAGAIN;
7229 else
7230 err = errno; /* Other errors are just passed on. */
7231 }
7232
7233 emacs_gnutls_transport_set_errno (process->gnutls_state, err);
7234
7235 return -1;
7236 }
7237 }
7238
7239 ssize_t
7240 emacs_gnutls_push (gnutls_transport_ptr_t p, const void* buf, size_t sz)
7241 {
7242 struct Lisp_Process *process = (struct Lisp_Process *)p;
7243 int fd = process->outfd;
7244 ssize_t n = sys_write (fd, buf, sz);
7245
7246 /* 0 or more bytes written means everything went fine. */
7247 if (n >= 0)
7248 return n;
7249
7250 /* Negative bytes written means we got an error in errno.
7251 Translate the WSAEWOULDBLOCK alias EWOULDBLOCK to EAGAIN. */
7252 emacs_gnutls_transport_set_errno (process->gnutls_state,
7253 errno == EWOULDBLOCK ? EAGAIN : errno);
7254
7255 return -1;
7256 }
7257 #endif /* HAVE_GNUTLS */
7258
7259 /* end of w32.c */