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Win32: fix potential multi-threading issue
[git/dscho.git] / compat / mingw.c
blob24b4014cf028dc193d375c87e5ce59e373081b65
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include "../strbuf.h"
5 #include "../run-command.h"
6 #include "../cache.h"
7
8 static const int delay[] = { 0, 1, 10, 20, 40 };
9 unsigned int _CRT_fmode = _O_BINARY;
10
11 int err_win_to_posix(DWORD winerr)
12 {
13 int error = ENOSYS;
14 switch(winerr) {
15 case ERROR_ACCESS_DENIED: error = EACCES; break;
16 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
17 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
18 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
19 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
20 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
21 case ERROR_BAD_COMMAND: error = EIO; break;
22 case ERROR_BAD_DEVICE: error = ENODEV; break;
23 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
24 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
25 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
26 case ERROR_BAD_LENGTH: error = EINVAL; break;
27 case ERROR_BAD_PATHNAME: error = ENOENT; break;
28 case ERROR_BAD_PIPE: error = EPIPE; break;
29 case ERROR_BAD_UNIT: error = ENODEV; break;
30 case ERROR_BAD_USERNAME: error = EINVAL; break;
31 case ERROR_BROKEN_PIPE: error = EPIPE; break;
32 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
33 case ERROR_BUSY: error = EBUSY; break;
34 case ERROR_BUSY_DRIVE: error = EBUSY; break;
35 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
36 case ERROR_CANNOT_MAKE: error = EACCES; break;
37 case ERROR_CANTOPEN: error = EIO; break;
38 case ERROR_CANTREAD: error = EIO; break;
39 case ERROR_CANTWRITE: error = EIO; break;
40 case ERROR_CRC: error = EIO; break;
41 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
42 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
43 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
44 case ERROR_DIRECTORY: error = EINVAL; break;
45 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
46 case ERROR_DISK_CHANGE: error = EIO; break;
47 case ERROR_DISK_FULL: error = ENOSPC; break;
48 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
49 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
50 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
51 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
52 case ERROR_FILE_EXISTS: error = EEXIST; break;
53 case ERROR_FILE_INVALID: error = ENODEV; break;
54 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
55 case ERROR_GEN_FAILURE: error = EIO; break;
56 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
57 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
58 case ERROR_INVALID_ACCESS: error = EACCES; break;
59 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
60 case ERROR_INVALID_BLOCK: error = EFAULT; break;
61 case ERROR_INVALID_DATA: error = EINVAL; break;
62 case ERROR_INVALID_DRIVE: error = ENODEV; break;
63 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
64 case ERROR_INVALID_FLAGS: error = EINVAL; break;
65 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
66 case ERROR_INVALID_HANDLE: error = EBADF; break;
67 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
68 case ERROR_INVALID_NAME: error = EINVAL; break;
69 case ERROR_INVALID_OWNER: error = EINVAL; break;
70 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
71 case ERROR_INVALID_PASSWORD: error = EPERM; break;
72 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
73 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
74 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
75 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
76 case ERROR_IO_DEVICE: error = EIO; break;
77 case ERROR_IO_INCOMPLETE: error = EINTR; break;
78 case ERROR_LOCKED: error = EBUSY; break;
79 case ERROR_LOCK_VIOLATION: error = EACCES; break;
80 case ERROR_LOGON_FAILURE: error = EACCES; break;
81 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
82 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
83 case ERROR_MORE_DATA: error = EPIPE; break;
84 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
85 case ERROR_NOACCESS: error = EFAULT; break;
86 case ERROR_NONE_MAPPED: error = EINVAL; break;
87 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
88 case ERROR_NOT_READY: error = EAGAIN; break;
89 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
90 case ERROR_NO_DATA: error = EPIPE; break;
91 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
92 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
93 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
94 case ERROR_OPEN_FAILED: error = EIO; break;
95 case ERROR_OPEN_FILES: error = EBUSY; break;
96 case ERROR_OPERATION_ABORTED: error = EINTR; break;
97 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
98 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
99 case ERROR_PATH_BUSY: error = EBUSY; break;
100 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
101 case ERROR_PIPE_BUSY: error = EBUSY; break;
102 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
103 case ERROR_PIPE_LISTENING: error = EPIPE; break;
104 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
105 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
106 case ERROR_READ_FAULT: error = EIO; break;
107 case ERROR_SEEK: error = EIO; break;
108 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
109 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
110 case ERROR_SHARING_VIOLATION: error = EACCES; break;
111 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
112 case ERROR_SWAPERROR: error = ENOENT; break;
113 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
114 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
115 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
116 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
117 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
118 case ERROR_WRITE_FAULT: error = EIO; break;
119 case ERROR_WRITE_PROTECT: error = EROFS; break;
120 }
121 return error;
122 }
123
124 static inline int is_file_in_use_error(DWORD errcode)
125 {
126 switch (errcode) {
127 case ERROR_SHARING_VIOLATION:
128 case ERROR_ACCESS_DENIED:
129 return 1;
130 }
131
132 return 0;
133 }
134
135 static int read_yes_no_answer(void)
136 {
137 char answer[1024];
138
139 if (fgets(answer, sizeof(answer), stdin)) {
140 size_t answer_len = strlen(answer);
141 int got_full_line = 0, c;
142
143 /* remove the newline */
144 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
145 answer[answer_len-2] = '\0';
146 got_full_line = 1;
147 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
148 answer[answer_len-1] = '\0';
149 got_full_line = 1;
150 }
151 /* flush the buffer in case we did not get the full line */
152 if (!got_full_line)
153 while ((c = getchar()) != EOF && c != '\n')
154 ;
155 } else
156 /* we could not read, return the
157 * default answer which is no */
158 return 0;
159
160 if (tolower(answer[0]) == 'y' && !answer[1])
161 return 1;
162 if (!strncasecmp(answer, "yes", sizeof(answer)))
163 return 1;
164 if (tolower(answer[0]) == 'n' && !answer[1])
165 return 0;
166 if (!strncasecmp(answer, "no", sizeof(answer)))
167 return 0;
168
169 /* did not find an answer we understand */
170 return -1;
171 }
172
173 static int ask_yes_no_if_possible(const char *format, ...)
174 {
175 char question[4096];
176 const char *retry_hook[] = { NULL, NULL, NULL };
177 va_list args;
178
179 va_start(args, format);
180 vsnprintf(question, sizeof(question), format, args);
181 va_end(args);
182
183 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
184 retry_hook[1] = question;
185 return !run_command_v_opt(retry_hook, 0);
186 }
187
188 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
189 return 0;
190
191 while (1) {
192 int answer;
193 fprintf(stderr, "%s (y/n) ", question);
194
195 if ((answer = read_yes_no_answer()) >= 0)
196 return answer;
197
198 fprintf(stderr, "Sorry, I did not understand your answer. "
199 "Please type 'y' or 'n'\n");
200 }
201 }
202
203 #undef unlink
204 int mingw_unlink(const char *pathname)
205 {
206 int ret, tries = 0;
207
208 /* read-only files cannot be removed */
209 chmod(pathname, 0666);
210 while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
211 if (!is_file_in_use_error(GetLastError()))
212 break;
213 /*
214 * We assume that some other process had the source or
215 * destination file open at the wrong moment and retry.
216 * In order to give the other process a higher chance to
217 * complete its operation, we give up our time slice now.
218 * If we have to retry again, we do sleep a bit.
219 */
220 Sleep(delay[tries]);
221 tries++;
222 }
223 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
224 ask_yes_no_if_possible("Unlink of file '%s' failed. "
225 "Should I try again?", pathname))
226 ret = unlink(pathname);
227 return ret;
228 }
229
230 static int is_dir_empty(const char *path)
231 {
232 struct strbuf buf = STRBUF_INIT;
233 WIN32_FIND_DATAA findbuf;
234 HANDLE handle;
235
236 strbuf_addf(&buf, "%s\\*", path);
237 handle = FindFirstFileA(buf.buf, &findbuf);
238 if (handle == INVALID_HANDLE_VALUE) {
239 strbuf_release(&buf);
240 return GetLastError() == ERROR_NO_MORE_FILES;
241 }
242
243 while (!strcmp(findbuf.cFileName, ".") ||
244 !strcmp(findbuf.cFileName, ".."))
245 if (!FindNextFile(handle, &findbuf)) {
246 strbuf_release(&buf);
247 return GetLastError() == ERROR_NO_MORE_FILES;
248 }
249 FindClose(handle);
250 strbuf_release(&buf);
251 return 0;
252 }
253
254 #undef rmdir
255 int mingw_rmdir(const char *pathname)
256 {
257 int ret, tries = 0;
258
259 while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
260 if (!is_file_in_use_error(GetLastError()))
261 break;
262 if (!is_dir_empty(pathname)) {
263 errno = ENOTEMPTY;
264 break;
265 }
266 /*
267 * We assume that some other process had the source or
268 * destination file open at the wrong moment and retry.
269 * In order to give the other process a higher chance to
270 * complete its operation, we give up our time slice now.
271 * If we have to retry again, we do sleep a bit.
272 */
273 Sleep(delay[tries]);
274 tries++;
275 }
276 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
277 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
278 "Should I try again?", pathname))
279 ret = rmdir(pathname);
280 return ret;
281 }
282
283 static int make_hidden(const char *path)
284 {
285 DWORD attribs = GetFileAttributes(path);
286 if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
287 return 0;
288 errno = err_win_to_posix(GetLastError());
289 return -1;
290 }
291
292 void mingw_mark_as_git_dir(const char *dir)
293 {
294 if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository() &&
295 make_hidden(dir))
296 warning("Failed to make '%s' hidden", dir);
297 git_config_set("core.hideDotFiles",
298 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
299 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
300 "dotGitOnly" : "true"));
301 }
302
303 #undef mkdir
304 int mingw_mkdir(const char *path, int mode)
305 {
306 int ret = mkdir(path);
307 if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
308 /*
309 * In Windows a file or dir starting with a dot is not
310 * automatically hidden. So lets mark it as hidden when
311 * such a directory is created.
312 */
313 const char *start = basename((char*)path);
314 if (*start == '.')
315 return make_hidden(path);
316 }
317 return ret;
318 }
319
320 #undef open
321 int mingw_open (const char *filename, int oflags, ...)
322 {
323 va_list args;
324 unsigned mode;
325 int fd;
326
327 va_start(args, oflags);
328 mode = va_arg(args, int);
329 va_end(args);
330
331 if (filename && !strcmp(filename, "/dev/null"))
332 filename = "nul";
333
334 fd = open(filename, oflags, mode);
335
336 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
337 DWORD attrs = GetFileAttributes(filename);
338 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
339 errno = EISDIR;
340 }
341 if ((oflags & O_CREAT) && fd >= 0 &&
342 hide_dotfiles == HIDE_DOTFILES_TRUE) {
343 /*
344 * In Windows a file or dir starting with a dot is not
345 * automatically hidden. So lets mark it as hidden when
346 * such a file is created.
347 */
348 const char *start = basename((char*)filename);
349 if (*start == '.' && make_hidden(filename))
350 warning("Could not mark '%s' as hidden.", filename);
351 }
352 return fd;
353 }
354
355 #undef write
356 ssize_t mingw_write(int fd, const void *buf, size_t count)
357 {
358 /*
359 * While write() calls to a file on a local disk are translated
360 * into WriteFile() calls with a maximum size of 64KB on Windows
361 * XP and 256KB on Vista, no such cap is placed on writes to
362 * files over the network on Windows XP. Unfortunately, there
363 * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
364 * bigger writes fail on Windows XP.
365 * So we cap to a nice 31MB here to avoid write failures over
366 * the net without changing the number of WriteFile() calls in
367 * the local case.
368 */
369 return write(fd, buf, min(count, 31 * 1024 * 1024));
370 }
371
372 #undef fopen
373 FILE *mingw_fopen (const char *filename, const char *otype)
374 {
375 int hide = 0;
376 FILE *file;
377 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
378 basename((char*)filename)[0] == '.')
379 hide = access(filename, F_OK);
380 if (filename && !strcmp(filename, "/dev/null"))
381 filename = "nul";
382 file = fopen(filename, otype);
383 if (file && hide && make_hidden(filename))
384 warning("Could not mark '%s' as hidden.", filename);
385 return file;
386 }
387
388 #undef freopen
389 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
390 {
391 int hide = 0;
392 FILE *file;
393 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
394 basename((char*)filename)[0] == '.')
395 hide = access(filename, F_OK);
396 if (filename && !strcmp(filename, "/dev/null"))
397 filename = "nul";
398 file = freopen(filename, otype, stream);
399 if (file && hide && make_hidden(filename))
400 warning("Could not mark '%s' as hidden.", filename);
401 return file;
402 }
403
404 /*
405 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
406 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
407 */
408 static inline long long filetime_to_hnsec(const FILETIME *ft)
409 {
410 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
411 /* Windows to Unix Epoch conversion */
412 return winTime - 116444736000000000LL;
413 }
414
415 static inline time_t filetime_to_time_t(const FILETIME *ft)
416 {
417 return (time_t)(filetime_to_hnsec(ft) / 10000000);
418 }
419
420 /* We keep the do_lstat code in a separate function to avoid recursion.
421 * When a path ends with a slash, the stat will fail with ENOENT. In
422 * this case, we strip the trailing slashes and stat again.
423 *
424 * If follow is true then act like stat() and report on the link
425 * target. Otherwise report on the link itself.
426 */
427 static int do_lstat(int follow, const char *file_name, struct stat *buf)
428 {
429 int err;
430 WIN32_FILE_ATTRIBUTE_DATA fdata;
431
432 if (!(err = get_file_attr(file_name, &fdata))) {
433 buf->st_ino = 0;
434 buf->st_gid = 0;
435 buf->st_uid = 0;
436 buf->st_nlink = 1;
437 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
438 buf->st_size = fdata.nFileSizeLow |
439 (((off_t)fdata.nFileSizeHigh)<<32);
440 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
441 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
442 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
443 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
444 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
445 WIN32_FIND_DATAA findbuf;
446 HANDLE handle = FindFirstFileA(file_name, &findbuf);
447 if (handle != INVALID_HANDLE_VALUE) {
448 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
449 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
450 if (follow) {
451 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
452 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
453 } else {
454 buf->st_mode = S_IFLNK;
455 }
456 buf->st_mode |= S_IREAD;
457 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
458 buf->st_mode |= S_IWRITE;
459 }
460 FindClose(handle);
461 }
462 }
463 return 0;
464 }
465 errno = err;
466 return -1;
467 }
468
469 /* We provide our own lstat/fstat functions, since the provided
470 * lstat/fstat functions are so slow. These stat functions are
471 * tailored for Git's usage (read: fast), and are not meant to be
472 * complete. Note that Git stat()s are redirected to mingw_lstat()
473 * too, since Windows doesn't really handle symlinks that well.
474 */
475 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
476 {
477 int namelen;
478 char alt_name[PATH_MAX];
479
480 if (!do_lstat(follow, file_name, buf))
481 return 0;
482
483 /* if file_name ended in a '/', Windows returned ENOENT;
484 * try again without trailing slashes
485 */
486 if (errno != ENOENT)
487 return -1;
488
489 namelen = strlen(file_name);
490 if (namelen && file_name[namelen-1] != '/')
491 return -1;
492 while (namelen && file_name[namelen-1] == '/')
493 --namelen;
494 if (!namelen || namelen >= PATH_MAX)
495 return -1;
496
497 memcpy(alt_name, file_name, namelen);
498 alt_name[namelen] = 0;
499 return do_lstat(follow, alt_name, buf);
500 }
501
502 int mingw_lstat(const char *file_name, struct stat *buf)
503 {
504 return do_stat_internal(0, file_name, buf);
505 }
506 int mingw_stat(const char *file_name, struct stat *buf)
507 {
508 return do_stat_internal(1, file_name, buf);
509 }
510
511 #undef fstat
512 int mingw_fstat(int fd, struct stat *buf)
513 {
514 HANDLE fh = (HANDLE)_get_osfhandle(fd);
515 BY_HANDLE_FILE_INFORMATION fdata;
516
517 if (fh == INVALID_HANDLE_VALUE) {
518 errno = EBADF;
519 return -1;
520 }
521 /* direct non-file handles to MS's fstat() */
522 if (GetFileType(fh) != FILE_TYPE_DISK)
523 return _fstati64(fd, buf);
524
525 if (GetFileInformationByHandle(fh, &fdata)) {
526 buf->st_ino = 0;
527 buf->st_gid = 0;
528 buf->st_uid = 0;
529 buf->st_nlink = 1;
530 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
531 buf->st_size = fdata.nFileSizeLow |
532 (((off_t)fdata.nFileSizeHigh)<<32);
533 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
534 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
535 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
536 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
537 return 0;
538 }
539 errno = EBADF;
540 return -1;
541 }
542
543 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
544 {
545 long long winTime = t * 10000000LL + 116444736000000000LL;
546 ft->dwLowDateTime = winTime;
547 ft->dwHighDateTime = winTime >> 32;
548 }
549
550 int mingw_utime (const char *file_name, const struct utimbuf *times)
551 {
552 FILETIME mft, aft;
553 int fh, rc;
554
555 /* must have write permission */
556 DWORD attrs = GetFileAttributes(file_name);
557 if (attrs != INVALID_FILE_ATTRIBUTES &&
558 (attrs & FILE_ATTRIBUTE_READONLY)) {
559 /* ignore errors here; open() will report them */
560 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
561 }
562
563 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
564 rc = -1;
565 goto revert_attrs;
566 }
567
568 if (times) {
569 time_t_to_filetime(times->modtime, &mft);
570 time_t_to_filetime(times->actime, &aft);
571 } else {
572 GetSystemTimeAsFileTime(&mft);
573 aft = mft;
574 }
575 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
576 errno = EINVAL;
577 rc = -1;
578 } else
579 rc = 0;
580 close(fh);
581
582 revert_attrs:
583 if (attrs != INVALID_FILE_ATTRIBUTES &&
584 (attrs & FILE_ATTRIBUTE_READONLY)) {
585 /* ignore errors again */
586 SetFileAttributes(file_name, attrs);
587 }
588 return rc;
589 }
590
591 unsigned int sleep (unsigned int seconds)
592 {
593 Sleep(seconds*1000);
594 return 0;
595 }
596
597 int mkstemp(char *template)
598 {
599 char *filename = mktemp(template);
600 if (filename == NULL)
601 return -1;
602 return open(filename, O_RDWR | O_CREAT, 0600);
603 }
604
605 int gettimeofday(struct timeval *tv, void *tz)
606 {
607 FILETIME ft;
608 long long hnsec;
609
610 GetSystemTimeAsFileTime(&ft);
611 hnsec = filetime_to_hnsec(&ft);
612 tv->tv_sec = hnsec / 10000000;
613 tv->tv_usec = (hnsec % 10000000) / 10;
614 return 0;
615 }
616
617 int pipe(int filedes[2])
618 {
619 HANDLE h[2];
620
621 /* this creates non-inheritable handles */
622 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
623 errno = err_win_to_posix(GetLastError());
624 return -1;
625 }
626 filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
627 if (filedes[0] < 0) {
628 CloseHandle(h[0]);
629 CloseHandle(h[1]);
630 return -1;
631 }
632 filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
633 if (filedes[0] < 0) {
634 close(filedes[0]);
635 CloseHandle(h[1]);
636 return -1;
637 }
638 return 0;
639 }
640
641 struct tm *gmtime_r(const time_t *timep, struct tm *result)
642 {
643 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
644 memcpy(result, gmtime(timep), sizeof(struct tm));
645 return result;
646 }
647
648 struct tm *localtime_r(const time_t *timep, struct tm *result)
649 {
650 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
651 memcpy(result, localtime(timep), sizeof(struct tm));
652 return result;
653 }
654
655 #undef getcwd
656 char *mingw_getcwd(char *pointer, int len)
657 {
658 int i;
659 char *ret = getcwd(pointer, len);
660 if (!ret)
661 return ret;
662 for (i = 0; pointer[i]; i++)
663 if (pointer[i] == '\\')
664 pointer[i] = '/';
665 return ret;
666 }
667
668 /*
669 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
670 * (Parsing C++ Command-Line Arguments)
671 */
672 static const char *quote_arg(const char *arg)
673 {
674 /* count chars to quote */
675 int len = 0, n = 0;
676 int force_quotes = 0;
677 char *q, *d;
678 const char *p = arg;
679 if (!*p) force_quotes = 1;
680 while (*p) {
681 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
682 force_quotes = 1;
683 else if (*p == '"')
684 n++;
685 else if (*p == '\\') {
686 int count = 0;
687 while (*p == '\\') {
688 count++;
689 p++;
690 len++;
691 }
692 if (*p == '"')
693 n += count*2 + 1;
694 continue;
695 }
696 len++;
697 p++;
698 }
699 if (!force_quotes && n == 0)
700 return arg;
701
702 /* insert \ where necessary */
703 d = q = xmalloc(len+n+3);
704 *d++ = '"';
705 while (*arg) {
706 if (*arg == '"')
707 *d++ = '\\';
708 else if (*arg == '\\') {
709 int count = 0;
710 while (*arg == '\\') {
711 count++;
712 *d++ = *arg++;
713 }
714 if (*arg == '"') {
715 while (count-- > 0)
716 *d++ = '\\';
717 *d++ = '\\';
718 }
719 }
720 *d++ = *arg++;
721 }
722 *d++ = '"';
723 *d++ = 0;
724 return q;
725 }
726
727 static const char *parse_interpreter(const char *cmd)
728 {
729 static char buf[100];
730 char *p, *opt;
731 int n, fd;
732
733 /* don't even try a .exe */
734 n = strlen(cmd);
735 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
736 return NULL;
737
738 fd = open(cmd, O_RDONLY);
739 if (fd < 0)
740 return NULL;
741 n = read(fd, buf, sizeof(buf)-1);
742 close(fd);
743 if (n < 4) /* at least '#!/x' and not error */
744 return NULL;
745
746 if (buf[0] != '#' || buf[1] != '!')
747 return NULL;
748 buf[n] = '\0';
749 p = buf + strcspn(buf, "\r\n");
750 if (!*p)
751 return NULL;
752
753 *p = '\0';
754 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
755 return NULL;
756 /* strip options */
757 if ((opt = strchr(p+1, ' ')))
758 *opt = '\0';
759 return p+1;
760 }
761
762 /*
763 * Splits the PATH into parts.
764 */
765 static char **get_path_split(void)
766 {
767 char *p, **path, *envpath = mingw_getenv("PATH");
768 int i, n = 0;
769
770 if (!envpath || !*envpath)
771 return NULL;
772
773 envpath = xstrdup(envpath);
774 p = envpath;
775 while (p) {
776 char *dir = p;
777 p = strchr(p, ';');
778 if (p) *p++ = '\0';
779 if (*dir) { /* not earlier, catches series of ; */
780 ++n;
781 }
782 }
783 if (!n)
784 return NULL;
785
786 path = xmalloc((n+1)*sizeof(char *));
787 p = envpath;
788 i = 0;
789 do {
790 if (*p)
791 path[i++] = xstrdup(p);
792 p = p+strlen(p)+1;
793 } while (i < n);
794 path[i] = NULL;
795
796 free(envpath);
797
798 return path;
799 }
800
801 static void free_path_split(char **path)
802 {
803 char **p = path;
804
805 if (!path)
806 return;
807
808 while (*p)
809 free(*p++);
810 free(path);
811 }
812
813 /*
814 * exe_only means that we only want to detect .exe files, but not scripts
815 * (which do not have an extension)
816 */
817 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
818 {
819 char path[MAX_PATH];
820 snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
821
822 if (!isexe && access(path, F_OK) == 0)
823 return xstrdup(path);
824 path[strlen(path)-4] = '\0';
825 if ((!exe_only || isexe) && access(path, F_OK) == 0)
826 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
827 return xstrdup(path);
828 return NULL;
829 }
830
831 /*
832 * Determines the absolute path of cmd using the split path in path.
833 * If cmd contains a slash or backslash, no lookup is performed.
834 */
835 static char *path_lookup(const char *cmd, char **path, int exe_only)
836 {
837 char *prog = NULL;
838 int len = strlen(cmd);
839 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
840
841 if (strchr(cmd, '/') || strchr(cmd, '\\'))
842 prog = xstrdup(cmd);
843
844 while (!prog && *path)
845 prog = lookup_prog(*path++, cmd, isexe, exe_only);
846
847 return prog;
848 }
849
850 static int env_compare(const void *a, const void *b)
851 {
852 char *const *ea = a;
853 char *const *eb = b;
854 return strcasecmp(*ea, *eb);
855 }
856
857 struct pinfo_t {
858 struct pinfo_t *next;
859 pid_t pid;
860 HANDLE proc;
861 } pinfo_t;
862 struct pinfo_t *pinfo = NULL;
863 CRITICAL_SECTION pinfo_cs;
864
865 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
866 const char *dir,
867 int prepend_cmd, int fhin, int fhout, int fherr)
868 {
869 STARTUPINFO si;
870 PROCESS_INFORMATION pi;
871 struct strbuf envblk, args;
872 unsigned flags;
873 BOOL ret;
874
875 /* Determine whether or not we are associated to a console */
876 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
877 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
878 FILE_ATTRIBUTE_NORMAL, NULL);
879 if (cons == INVALID_HANDLE_VALUE) {
880 /* There is no console associated with this process.
881 * Since the child is a console process, Windows
882 * would normally create a console window. But
883 * since we'll be redirecting std streams, we do
884 * not need the console.
885 * It is necessary to use DETACHED_PROCESS
886 * instead of CREATE_NO_WINDOW to make ssh
887 * recognize that it has no console.
888 */
889 flags = DETACHED_PROCESS;
890 } else {
891 /* There is already a console. If we specified
892 * DETACHED_PROCESS here, too, Windows would
893 * disassociate the child from the console.
894 * The same is true for CREATE_NO_WINDOW.
895 * Go figure!
896 */
897 flags = 0;
898 CloseHandle(cons);
899 }
900 memset(&si, 0, sizeof(si));
901 si.cb = sizeof(si);
902 si.dwFlags = STARTF_USESTDHANDLES;
903 si.hStdInput = (HANDLE) _get_osfhandle(fhin);
904 si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
905 si.hStdError = (HANDLE) _get_osfhandle(fherr);
906
907 /* concatenate argv, quoting args as we go */
908 strbuf_init(&args, 0);
909 if (prepend_cmd) {
910 char *quoted = (char *)quote_arg(cmd);
911 strbuf_addstr(&args, quoted);
912 if (quoted != cmd)
913 free(quoted);
914 }
915 for (; *argv; argv++) {
916 char *quoted = (char *)quote_arg(*argv);
917 if (*args.buf)
918 strbuf_addch(&args, ' ');
919 strbuf_addstr(&args, quoted);
920 if (quoted != *argv)
921 free(quoted);
922 }
923
924 if (env) {
925 int count = 0;
926 char **e, **sorted_env;
927
928 for (e = env; *e; e++)
929 count++;
930
931 /* environment must be sorted */
932 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
933 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
934 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
935
936 strbuf_init(&envblk, 0);
937 for (e = sorted_env; *e; e++) {
938 strbuf_addstr(&envblk, *e);
939 strbuf_addch(&envblk, '\0');
940 }
941 free(sorted_env);
942 }
943
944 memset(&pi, 0, sizeof(pi));
945 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
946 env ? envblk.buf : NULL, dir, &si, &pi);
947
948 if (env)
949 strbuf_release(&envblk);
950 strbuf_release(&args);
951
952 if (!ret) {
953 errno = ENOENT;
954 return -1;
955 }
956 CloseHandle(pi.hThread);
957
958 /*
959 * The process ID is the human-readable identifier of the process
960 * that we want to present in log and error messages. The handle
961 * is not useful for this purpose. But we cannot close it, either,
962 * because it is not possible to turn a process ID into a process
963 * handle after the process terminated.
964 * Keep the handle in a list for waitpid.
965 */
966 EnterCriticalSection(&pinfo_cs);
967 {
968 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
969 info->pid = pi.dwProcessId;
970 info->proc = pi.hProcess;
971 info->next = pinfo;
972 pinfo = info;
973 }
974 LeaveCriticalSection(&pinfo_cs);
975
976 return (pid_t)pi.dwProcessId;
977 }
978
979 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
980 int prepend_cmd)
981 {
982 return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
983 }
984
985 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
986 const char *dir,
987 int fhin, int fhout, int fherr)
988 {
989 pid_t pid;
990 char **path = get_path_split();
991 char *prog = path_lookup(cmd, path, 0);
992
993 if (!prog) {
994 errno = ENOENT;
995 pid = -1;
996 }
997 else {
998 const char *interpr = parse_interpreter(prog);
999
1000 if (interpr) {
1001 const char *argv0 = argv[0];
1002 char *iprog = path_lookup(interpr, path, 1);
1003 argv[0] = prog;
1004 if (!iprog) {
1005 errno = ENOENT;
1006 pid = -1;
1007 }
1008 else {
1009 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1010 fhin, fhout, fherr);
1011 free(iprog);
1012 }
1013 argv[0] = argv0;
1014 }
1015 else
1016 pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1017 fhin, fhout, fherr);
1018 free(prog);
1019 }
1020 free_path_split(path);
1021 return pid;
1022 }
1023
1024 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1025 {
1026 const char *interpr = parse_interpreter(cmd);
1027 char **path;
1028 char *prog;
1029 int pid = 0;
1030
1031 if (!interpr)
1032 return 0;
1033 path = get_path_split();
1034 prog = path_lookup(interpr, path, 1);
1035 if (prog) {
1036 int argc = 0;
1037 const char **argv2;
1038 while (argv[argc]) argc++;
1039 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1040 argv2[0] = (char *)cmd; /* full path to the script file */
1041 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1042 pid = mingw_spawnve(prog, argv2, env, 1);
1043 if (pid >= 0) {
1044 int status;
1045 if (waitpid(pid, &status, 0) < 0)
1046 status = 255;
1047 exit(status);
1048 }
1049 pid = 1; /* indicate that we tried but failed */
1050 free(prog);
1051 free(argv2);
1052 }
1053 free_path_split(path);
1054 return pid;
1055 }
1056
1057 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1058 {
1059 /* check if git_command is a shell script */
1060 if (!try_shell_exec(cmd, argv, (char **)env)) {
1061 int pid, status;
1062
1063 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1064 if (pid < 0)
1065 return;
1066 if (waitpid(pid, &status, 0) < 0)
1067 status = 255;
1068 exit(status);
1069 }
1070 }
1071
1072 int mingw_execvp(const char *cmd, char *const *argv)
1073 {
1074 char **path = get_path_split();
1075 char *prog = path_lookup(cmd, path, 0);
1076
1077 if (prog) {
1078 mingw_execve(prog, argv, environ);
1079 free(prog);
1080 } else
1081 errno = ENOENT;
1082
1083 free_path_split(path);
1084 return -1;
1085 }
1086
1087 int mingw_execv(const char *cmd, char *const *argv)
1088 {
1089 mingw_execve(cmd, argv, environ);
1090 return -1;
1091 }
1092
1093 int mingw_kill(pid_t pid, int sig)
1094 {
1095 if (pid > 0 && sig == SIGTERM) {
1096 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1097
1098 if (TerminateProcess(h, -1)) {
1099 CloseHandle(h);
1100 return 0;
1101 }
1102
1103 errno = err_win_to_posix(GetLastError());
1104 CloseHandle(h);
1105 return -1;
1106 }
1107
1108 errno = EINVAL;
1109 return -1;
1110 }
1111
1112 static char **copy_environ(void)
1113 {
1114 char **env;
1115 int i = 0;
1116 while (environ[i])
1117 i++;
1118 env = xmalloc((i+1)*sizeof(*env));
1119 for (i = 0; environ[i]; i++)
1120 env[i] = xstrdup(environ[i]);
1121 env[i] = NULL;
1122 return env;
1123 }
1124
1125 void free_environ(char **env)
1126 {
1127 int i;
1128 for (i = 0; env[i]; i++)
1129 free(env[i]);
1130 free(env);
1131 }
1132
1133 static int lookup_env(char **env, const char *name, size_t nmln)
1134 {
1135 int i;
1136
1137 for (i = 0; env[i]; i++) {
1138 if (0 == strncmp(env[i], name, nmln)
1139 && '=' == env[i][nmln])
1140 /* matches */
1141 return i;
1142 }
1143 return -1;
1144 }
1145
1146 /*
1147 * If name contains '=', then sets the variable, otherwise it unsets it
1148 */
1149 static char **env_setenv(char **env, const char *name)
1150 {
1151 char *eq = strchrnul(name, '=');
1152 int i = lookup_env(env, name, eq-name);
1153
1154 if (i < 0) {
1155 if (*eq) {
1156 for (i = 0; env[i]; i++)
1157 ;
1158 env = xrealloc(env, (i+2)*sizeof(*env));
1159 env[i] = xstrdup(name);
1160 env[i+1] = NULL;
1161 }
1162 }
1163 else {
1164 free(env[i]);
1165 if (*eq)
1166 env[i] = xstrdup(name);
1167 else
1168 for (; env[i]; i++)
1169 env[i] = env[i+1];
1170 }
1171 return env;
1172 }
1173
1174 /*
1175 * Copies global environ and adjusts variables as specified by vars.
1176 */
1177 char **make_augmented_environ(const char *const *vars)
1178 {
1179 char **env = copy_environ();
1180
1181 while (*vars)
1182 env = env_setenv(env, *vars++);
1183 return env;
1184 }
1185
1186 #undef getenv
1187
1188 /*
1189 * The system's getenv looks up the name in a case-insensitive manner.
1190 * This version tries a case-sensitive lookup and falls back to
1191 * case-insensitive if nothing was found. This is necessary because,
1192 * as a prominent example, CMD sets 'Path', but not 'PATH'.
1193 * Warning: not thread-safe.
1194 */
1195 static char *getenv_cs(const char *name)
1196 {
1197 size_t len = strlen(name);
1198 int i = lookup_env(environ, name, len);
1199 if (i >= 0)
1200 return environ[i] + len + 1; /* skip past name and '=' */
1201 return getenv(name);
1202 }
1203
1204 char *mingw_getenv(const char *name)
1205 {
1206 char *result = getenv_cs(name);
1207 if (!result && !strcmp(name, "TMPDIR")) {
1208 /* on Windows it is TMP and TEMP */
1209 result = getenv_cs("TMP");
1210 if (!result)
1211 result = getenv_cs("TEMP");
1212 }
1213 else if (!result && !strcmp(name, "TERM")) {
1214 /* simulate TERM to enable auto-color (see color.c) */
1215 result = "winansi";
1216 }
1217 return result;
1218 }
1219
1220 /*
1221 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1222 * that service contains a numerical port, or that it is null. It
1223 * does a simple search using gethostbyname, and returns one IPv4 host
1224 * if one was found.
1225 */
1226 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1227 const struct addrinfo *hints,
1228 struct addrinfo **res)
1229 {
1230 struct hostent *h = NULL;
1231 struct addrinfo *ai;
1232 struct sockaddr_in *sin;
1233
1234 if (node) {
1235 h = gethostbyname(node);
1236 if (!h)
1237 return WSAGetLastError();
1238 }
1239
1240 ai = xmalloc(sizeof(struct addrinfo));
1241 *res = ai;
1242 ai->ai_flags = 0;
1243 ai->ai_family = AF_INET;
1244 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1245 switch (ai->ai_socktype) {
1246 case SOCK_STREAM:
1247 ai->ai_protocol = IPPROTO_TCP;
1248 break;
1249 case SOCK_DGRAM:
1250 ai->ai_protocol = IPPROTO_UDP;
1251 break;
1252 default:
1253 ai->ai_protocol = 0;
1254 break;
1255 }
1256 ai->ai_addrlen = sizeof(struct sockaddr_in);
1257 if (hints && (hints->ai_flags & AI_CANONNAME))
1258 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1259 else
1260 ai->ai_canonname = NULL;
1261
1262 sin = xmalloc(ai->ai_addrlen);
1263 memset(sin, 0, ai->ai_addrlen);
1264 sin->sin_family = AF_INET;
1265 /* Note: getaddrinfo is supposed to allow service to be a string,
1266 * which should be looked up using getservbyname. This is
1267 * currently not implemented */
1268 if (service)
1269 sin->sin_port = htons(atoi(service));
1270 if (h)
1271 sin->sin_addr = *(struct in_addr *)h->h_addr;
1272 else if (hints && (hints->ai_flags & AI_PASSIVE))
1273 sin->sin_addr.s_addr = INADDR_ANY;
1274 else
1275 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1276 ai->ai_addr = (struct sockaddr *)sin;
1277 ai->ai_next = 0;
1278 return 0;
1279 }
1280
1281 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1282 {
1283 free(res->ai_canonname);
1284 free(res->ai_addr);
1285 free(res);
1286 }
1287
1288 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1289 char *host, DWORD hostlen,
1290 char *serv, DWORD servlen, int flags)
1291 {
1292 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1293 if (sa->sa_family != AF_INET)
1294 return EAI_FAMILY;
1295 if (!host && !serv)
1296 return EAI_NONAME;
1297
1298 if (host && hostlen > 0) {
1299 struct hostent *ent = NULL;
1300 if (!(flags & NI_NUMERICHOST))
1301 ent = gethostbyaddr((const char *)&sin->sin_addr,
1302 sizeof(sin->sin_addr), AF_INET);
1303
1304 if (ent)
1305 snprintf(host, hostlen, "%s", ent->h_name);
1306 else if (flags & NI_NAMEREQD)
1307 return EAI_NONAME;
1308 else
1309 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1310 }
1311
1312 if (serv && servlen > 0) {
1313 struct servent *ent = NULL;
1314 if (!(flags & NI_NUMERICSERV))
1315 ent = getservbyport(sin->sin_port,
1316 flags & NI_DGRAM ? "udp" : "tcp");
1317
1318 if (ent)
1319 snprintf(serv, servlen, "%s", ent->s_name);
1320 else
1321 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1322 }
1323
1324 return 0;
1325 }
1326
1327 static HMODULE ipv6_dll = NULL;
1328 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1329 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1330 const struct addrinfo *hints,
1331 struct addrinfo **res);
1332 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1333 char *host, DWORD hostlen,
1334 char *serv, DWORD servlen, int flags);
1335 /*
1336 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1337 * don't need to try to load that one dynamically.
1338 */
1339
1340 static void socket_cleanup(void)
1341 {
1342 WSACleanup();
1343 if (ipv6_dll)
1344 FreeLibrary(ipv6_dll);
1345 ipv6_dll = NULL;
1346 ipv6_freeaddrinfo = freeaddrinfo_stub;
1347 ipv6_getaddrinfo = getaddrinfo_stub;
1348 ipv6_getnameinfo = getnameinfo_stub;
1349 }
1350
1351 static void ensure_socket_initialization(void)
1352 {
1353 WSADATA wsa;
1354 static int initialized = 0;
1355 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1356 const char **name;
1357
1358 if (initialized)
1359 return;
1360
1361 if (WSAStartup(MAKEWORD(2,2), &wsa))
1362 die("unable to initialize winsock subsystem, error %d",
1363 WSAGetLastError());
1364
1365 for (name = libraries; *name; name++) {
1366 ipv6_dll = LoadLibrary(*name);
1367 if (!ipv6_dll)
1368 continue;
1369
1370 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1371 GetProcAddress(ipv6_dll, "freeaddrinfo");
1372 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1373 const struct addrinfo *,
1374 struct addrinfo **))
1375 GetProcAddress(ipv6_dll, "getaddrinfo");
1376 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1377 socklen_t, char *, DWORD,
1378 char *, DWORD, int))
1379 GetProcAddress(ipv6_dll, "getnameinfo");
1380 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1381 FreeLibrary(ipv6_dll);
1382 ipv6_dll = NULL;
1383 } else
1384 break;
1385 }
1386 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1387 ipv6_freeaddrinfo = freeaddrinfo_stub;
1388 ipv6_getaddrinfo = getaddrinfo_stub;
1389 ipv6_getnameinfo = getnameinfo_stub;
1390 }
1391
1392 atexit(socket_cleanup);
1393 initialized = 1;
1394 }
1395
1396 #undef gethostname
1397 int mingw_gethostname(char *name, int namelen)
1398 {
1399 ensure_socket_initialization();
1400 return gethostname(name, namelen);
1401 }
1402
1403 #undef gethostbyname
1404 struct hostent *mingw_gethostbyname(const char *host)
1405 {
1406 ensure_socket_initialization();
1407 return gethostbyname(host);
1408 }
1409
1410 void mingw_freeaddrinfo(struct addrinfo *res)
1411 {
1412 ipv6_freeaddrinfo(res);
1413 }
1414
1415 int mingw_getaddrinfo(const char *node, const char *service,
1416 const struct addrinfo *hints, struct addrinfo **res)
1417 {
1418 ensure_socket_initialization();
1419 return ipv6_getaddrinfo(node, service, hints, res);
1420 }
1421
1422 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1423 char *host, DWORD hostlen, char *serv, DWORD servlen,
1424 int flags)
1425 {
1426 ensure_socket_initialization();
1427 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1428 }
1429
1430 int mingw_socket(int domain, int type, int protocol)
1431 {
1432 int sockfd;
1433 SOCKET s;
1434
1435 ensure_socket_initialization();
1436 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1437 if (s == INVALID_SOCKET) {
1438 /*
1439 * WSAGetLastError() values are regular BSD error codes
1440 * biased by WSABASEERR.
1441 * However, strerror() does not know about networking
1442 * specific errors, which are values beginning at 38 or so.
1443 * Therefore, we choose to leave the biased error code
1444 * in errno so that _if_ someone looks up the code somewhere,
1445 * then it is at least the number that are usually listed.
1446 */
1447 errno = WSAGetLastError();
1448 return -1;
1449 }
1450 /* convert into a file descriptor */
1451 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1452 closesocket(s);
1453 return error("unable to make a socket file descriptor: %s",
1454 strerror(errno));
1455 }
1456 return sockfd;
1457 }
1458
1459 #undef connect
1460 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1461 {
1462 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1463 return connect(s, sa, sz);
1464 }
1465
1466 #undef bind
1467 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1468 {
1469 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1470 return bind(s, sa, sz);
1471 }
1472
1473 #undef setsockopt
1474 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1475 {
1476 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1477 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1478 }
1479
1480 #undef shutdown
1481 int mingw_shutdown(int sockfd, int how)
1482 {
1483 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1484 return shutdown(s, how);
1485 }
1486
1487 #undef listen
1488 int mingw_listen(int sockfd, int backlog)
1489 {
1490 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1491 return listen(s, backlog);
1492 }
1493
1494 #undef accept
1495 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1496 {
1497 int sockfd2;
1498
1499 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1500 SOCKET s2 = accept(s1, sa, sz);
1501
1502 /* convert into a file descriptor */
1503 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1504 int err = errno;
1505 closesocket(s2);
1506 return error("unable to make a socket file descriptor: %s",
1507 strerror(err));
1508 }
1509 return sockfd2;
1510 }
1511
1512 #undef rename
1513 int mingw_rename(const char *pold, const char *pnew)
1514 {
1515 DWORD attrs, gle;
1516 int tries = 0;
1517
1518 /*
1519 * Try native rename() first to get errno right.
1520 * It is based on MoveFile(), which cannot overwrite existing files.
1521 */
1522 if (!rename(pold, pnew))
1523 return 0;
1524 if (errno != EEXIST)
1525 return -1;
1526 repeat:
1527 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1528 return 0;
1529 /* TODO: translate more errors */
1530 gle = GetLastError();
1531 if (gle == ERROR_ACCESS_DENIED &&
1532 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1533 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1534 errno = EISDIR;
1535 return -1;
1536 }
1537 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1538 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1539 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1540 return 0;
1541 gle = GetLastError();
1542 /* revert file attributes on failure */
1543 SetFileAttributes(pnew, attrs);
1544 }
1545 }
1546 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1547 /*
1548 * We assume that some other process had the source or
1549 * destination file open at the wrong moment and retry.
1550 * In order to give the other process a higher chance to
1551 * complete its operation, we give up our time slice now.
1552 * If we have to retry again, we do sleep a bit.
1553 */
1554 Sleep(delay[tries]);
1555 tries++;
1556 goto repeat;
1557 }
1558 if (gle == ERROR_ACCESS_DENIED &&
1559 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1560 "Should I try again?", pold, pnew))
1561 goto repeat;
1562
1563 errno = EACCES;
1564 return -1;
1565 }
1566
1567 /*
1568 * Note that this doesn't return the actual pagesize, but
1569 * the allocation granularity. If future Windows specific git code
1570 * needs the real getpagesize function, we need to find another solution.
1571 */
1572 int mingw_getpagesize(void)
1573 {
1574 SYSTEM_INFO si;
1575 GetSystemInfo(&si);
1576 return si.dwAllocationGranularity;
1577 }
1578
1579 struct passwd *getpwuid(int uid)
1580 {
1581 static char user_name[100];
1582 static struct passwd p;
1583
1584 DWORD len = sizeof(user_name);
1585 if (!GetUserName(user_name, &len))
1586 return NULL;
1587 p.pw_name = user_name;
1588 p.pw_gecos = "unknown";
1589 p.pw_dir = NULL;
1590 return &p;
1591 }
1592
1593 static HANDLE timer_event;
1594 static HANDLE timer_thread;
1595 static int timer_interval;
1596 static int one_shot;
1597 static sig_handler_t timer_fn = SIG_DFL;
1598
1599 /* The timer works like this:
1600 * The thread, ticktack(), is a trivial routine that most of the time
1601 * only waits to receive the signal to terminate. The main thread tells
1602 * the thread to terminate by setting the timer_event to the signalled
1603 * state.
1604 * But ticktack() interrupts the wait state after the timer's interval
1605 * length to call the signal handler.
1606 */
1607
1608 static unsigned __stdcall ticktack(void *dummy)
1609 {
1610 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1611 if (timer_fn == SIG_DFL)
1612 die("Alarm");
1613 if (timer_fn != SIG_IGN)
1614 timer_fn(SIGALRM);
1615 if (one_shot)
1616 break;
1617 }
1618 return 0;
1619 }
1620
1621 static int start_timer_thread(void)
1622 {
1623 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1624 if (timer_event) {
1625 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1626 if (!timer_thread )
1627 return errno = ENOMEM,
1628 error("cannot start timer thread");
1629 } else
1630 return errno = ENOMEM,
1631 error("cannot allocate resources for timer");
1632 return 0;
1633 }
1634
1635 static void stop_timer_thread(void)
1636 {
1637 if (timer_event)
1638 SetEvent(timer_event); /* tell thread to terminate */
1639 if (timer_thread) {
1640 int rc = WaitForSingleObject(timer_thread, 1000);
1641 if (rc == WAIT_TIMEOUT)
1642 error("timer thread did not terminate timely");
1643 else if (rc != WAIT_OBJECT_0)
1644 error("waiting for timer thread failed: %lu",
1645 GetLastError());
1646 CloseHandle(timer_thread);
1647 }
1648 if (timer_event)
1649 CloseHandle(timer_event);
1650 timer_event = NULL;
1651 timer_thread = NULL;
1652 }
1653
1654 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1655 {
1656 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1657 }
1658
1659 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1660 {
1661 static const struct timeval zero;
1662 static int atexit_done;
1663
1664 if (out != NULL)
1665 return errno = EINVAL,
1666 error("setitimer param 3 != NULL not implemented");
1667 if (!is_timeval_eq(&in->it_interval, &zero) &&
1668 !is_timeval_eq(&in->it_interval, &in->it_value))
1669 return errno = EINVAL,
1670 error("setitimer: it_interval must be zero or eq it_value");
1671
1672 if (timer_thread)
1673 stop_timer_thread();
1674
1675 if (is_timeval_eq(&in->it_value, &zero) &&
1676 is_timeval_eq(&in->it_interval, &zero))
1677 return 0;
1678
1679 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1680 one_shot = is_timeval_eq(&in->it_interval, &zero);
1681 if (!atexit_done) {
1682 atexit(stop_timer_thread);
1683 atexit_done = 1;
1684 }
1685 return start_timer_thread();
1686 }
1687
1688 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1689 {
1690 if (sig != SIGALRM)
1691 return errno = EINVAL,
1692 error("sigaction only implemented for SIGALRM");
1693 if (out != NULL)
1694 return errno = EINVAL,
1695 error("sigaction: param 3 != NULL not implemented");
1696
1697 timer_fn = in->sa_handler;
1698 return 0;
1699 }
1700
1701 #undef signal
1702 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1703 {
1704 sig_handler_t old = timer_fn;
1705 if (sig != SIGALRM)
1706 return signal(sig, handler);
1707 timer_fn = handler;
1708 return old;
1709 }
1710
1711 static const char *make_backslash_path(const char *path)
1712 {
1713 static char buf[PATH_MAX + 1];
1714 char *c;
1715
1716 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1717 die("Too long path: %.*s", 60, path);
1718
1719 for (c = buf; *c; c++) {
1720 if (*c == '/')
1721 *c = '\\';
1722 }
1723 return buf;
1724 }
1725
1726 void mingw_open_html(const char *unixpath)
1727 {
1728 const char *htmlpath = make_backslash_path(unixpath);
1729 typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1730 const char *, const char *, const char *, INT);
1731 T ShellExecute;
1732 HMODULE shell32;
1733 int r;
1734
1735 shell32 = LoadLibrary("shell32.dll");
1736 if (!shell32)
1737 die("cannot load shell32.dll");
1738 ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1739 if (!ShellExecute)
1740 die("cannot run browser");
1741
1742 printf("Launching default browser to display HTML ...\n");
1743 r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1744 FreeLibrary(shell32);
1745 /* see the MSDN documentation referring to the result codes here */
1746 if (r <= 32) {
1747 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1748 }
1749 }
1750
1751 int link(const char *oldpath, const char *newpath)
1752 {
1753 typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1754 static T create_hard_link = NULL;
1755 if (!create_hard_link) {
1756 create_hard_link = (T) GetProcAddress(
1757 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1758 if (!create_hard_link)
1759 create_hard_link = (T)-1;
1760 }
1761 if (create_hard_link == (T)-1) {
1762 errno = ENOSYS;
1763 return -1;
1764 }
1765 if (!create_hard_link(newpath, oldpath, NULL)) {
1766 errno = err_win_to_posix(GetLastError());
1767 return -1;
1768 }
1769 return 0;
1770 }
1771
1772 char *getpass(const char *prompt)
1773 {
1774 struct strbuf buf = STRBUF_INIT;
1775
1776 fputs(prompt, stderr);
1777 for (;;) {
1778 char c = _getch();
1779 if (c == '\r' || c == '\n')
1780 break;
1781 strbuf_addch(&buf, c);
1782 }
1783 fputs("\n", stderr);
1784 return strbuf_detach(&buf, NULL);
1785 }
1786
1787 pid_t waitpid(pid_t pid, int *status, int options)
1788 {
1789 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1790 FALSE, pid);
1791 if (!h) {
1792 errno = ECHILD;
1793 return -1;
1794 }
1795
1796 if (pid > 0 && options & WNOHANG) {
1797 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1798 CloseHandle(h);
1799 return 0;
1800 }
1801 options &= ~WNOHANG;
1802 }
1803
1804 if (options == 0) {
1805 struct pinfo_t **ppinfo;
1806 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1807 CloseHandle(h);
1808 return 0;
1809 }
1810
1811 if (status)
1812 GetExitCodeProcess(h, (LPDWORD)status);
1813
1814 EnterCriticalSection(&pinfo_cs);
1815
1816 ppinfo = &pinfo;
1817 while (*ppinfo) {
1818 struct pinfo_t *info = *ppinfo;
1819 if (info->pid == pid) {
1820 CloseHandle(info->proc);
1821 *ppinfo = info->next;
1822 free(info);
1823 break;
1824 }
1825 ppinfo = &info->next;
1826 }
1827
1828 LeaveCriticalSection(&pinfo_cs);
1829
1830 CloseHandle(h);
1831 return pid;
1832 }
1833 CloseHandle(h);
1834
1835 errno = EINVAL;
1836 return -1;
1837 }
1838
1839 const char *get_windows_home_directory(void)
1840 {
1841 static const char *home_directory = NULL;
1842 struct strbuf buf = STRBUF_INIT;
1843
1844 if (home_directory)
1845 return home_directory;
1846
1847 home_directory = getenv("HOME");
1848 if (home_directory && *home_directory)
1849 return home_directory;
1850
1851 strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1852 home_directory = strbuf_detach(&buf, NULL);
1853
1854 return home_directory;
1855 }
1856
1857 int mingw_offset_1st_component(const char *path)
1858 {
1859 int offset = 0;
1860 if (has_dos_drive_prefix(path))
1861 offset = 2;
1862
1863 /* unc paths */
1864 else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1865
1866 /* skip server name */
1867 char *pos = strpbrk(path + 2, "\\/");
1868 if (!pos)
1869 return 0; /* Error: malformed unc path */
1870
1871 do {
1872 pos++;
1873 } while (*pos && !is_dir_sep(*pos));
1874
1875 offset = pos - path;
1876 }
1877
1878 return offset + is_dir_sep(path[offset]);
1879 }
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