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Allow using UNC path for git repository
[git/dscho.git] / compat / mingw.c
blob861d3dad35fc781e6a17eafd2c50996b6b43d1b6
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include "../strbuf.h"
5 #include "../cache.h"
6 #include "../run-command.h"
7
8 unsigned int _CRT_fmode = _O_BINARY;
9 static const int delay[] = { 0, 1, 10, 20, 40 };
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 int make_hidden(const char *path)
125 {
126 DWORD attribs = GetFileAttributes(path);
127 if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
128 return 0;
129 errno = err_win_to_posix(GetLastError());
130 return -1;
131 }
132
133 void mingw_mark_as_git_dir(const char *dir)
134 {
135 if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository() &&
136 make_hidden(dir))
137 warning("Failed to make '%s' hidden", dir);
138 git_config_set("core.hideDotFiles",
139 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
140 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
141 "dotGitOnly" : "true"));
142 }
143
144 #undef mkdir
145 int mingw_mkdir(const char *path, int mode)
146 {
147 int ret = mkdir(path);
148 if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
149 /*
150 * In Windows a file or dir starting with a dot is not
151 * automatically hidden. So lets mark it as hidden when
152 * such a directory is created.
153 */
154 const char *start = basename((char*)path);
155 if (*start == '.')
156 return make_hidden(path);
157 }
158 return ret;
159 }
160
161 static int ask_user_yes_no(const char *format, ...)
162 {
163 char answer[5];
164 char question[4096];
165 const char *retry_hook[] = { NULL, NULL, NULL };
166 va_list args;
167
168 if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
169
170 va_start(args, format);
171 vsnprintf(question, sizeof(question), format, args);
172 va_end(args);
173
174 retry_hook[1] = question;
175 return !run_command_v_opt(retry_hook, 0);
176 }
177
178 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
179 return 0;
180
181 while (1) {
182 va_start(args, format);
183 vfprintf(stderr, format, args);
184 va_end(args);
185 fprintf(stderr, " (y/n)? ");
186
187 if (fgets(answer, sizeof(answer), stdin)) {
188 /* remove the newline */
189 if (answer[strlen(answer)-2] == '\r')
190 answer[strlen(answer)-2] = '\0';
191 if (answer[strlen(answer)-1] == '\n')
192 answer[strlen(answer)-1] = '\0';
193 } else
194 return 0;
195
196 if (answer[0] == 'y' && strlen(answer) == 1)
197 return 1;
198 if (!strncasecmp(answer, "yes", sizeof(answer)))
199 return 1;
200 if (answer[0] == 'n' && strlen(answer) == 1)
201 return 0;
202 if (!strncasecmp(answer, "no", sizeof(answer)))
203 return 0;
204 fprintf(stderr, "I did not understand your answer: '%s'\n",
205 answer);
206 }
207 }
208
209 #undef unlink
210 int mingw_unlink(const char *pathname)
211 {
212 int ret, tries = 0;
213
214 /* read-only files cannot be removed */
215 chmod(pathname, 0666);
216 while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
217 if (errno != EACCES)
218 break;
219 /*
220 * We assume that some other process had the source or
221 * destination file open at the wrong moment and retry.
222 * In order to give the other process a higher chance to
223 * complete its operation, we give up our time slice now.
224 * If we have to retry again, we do sleep a bit.
225 */
226 Sleep(delay[tries]);
227 tries++;
228 }
229 while (ret == -1 && errno == EACCES &&
230 ask_user_yes_no("Unlink of file '%s' failed. "
231 "Should I try again?", pathname))
232 ret = unlink(pathname);
233 return ret;
234 }
235
236 static int is_dir_empty(const char *path)
237 {
238 struct strbuf buf = STRBUF_INIT;
239 WIN32_FIND_DATAA findbuf;
240 HANDLE handle;
241
242 strbuf_addf(&buf, "%s\\*", path);
243 handle = FindFirstFileA(buf.buf, &findbuf);
244 if (handle == INVALID_HANDLE_VALUE) {
245 strbuf_release(&buf);
246 return GetLastError() == ERROR_NO_MORE_FILES;
247 }
248
249 while (!strcmp(findbuf.cFileName, ".") ||
250 !strcmp(findbuf.cFileName, ".."))
251 if (!FindNextFile(handle, &findbuf)) {
252 strbuf_release(&buf);
253 return GetLastError() == ERROR_NO_MORE_FILES;
254 }
255 FindClose(handle);
256 strbuf_release(&buf);
257 return 0;
258 }
259
260 #undef rmdir
261 int mingw_rmdir(const char *pathname)
262 {
263 int ret, tries = 0;
264
265 while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
266 if (errno != EACCES)
267 break;
268 if (!is_dir_empty(pathname)) {
269 errno = ENOTEMPTY;
270 break;
271 }
272 /*
273 * We assume that some other process had the source or
274 * destination file open at the wrong moment and retry.
275 * In order to give the other process a higher chance to
276 * complete its operation, we give up our time slice now.
277 * If we have to retry again, we do sleep a bit.
278 */
279 Sleep(delay[tries]);
280 tries++;
281 }
282 while (ret == -1 && errno == EACCES &&
283 ask_user_yes_no("Deletion of directory '%s' failed. "
284 "Should I try again?", pathname))
285 ret = rmdir(pathname);
286 return ret;
287 }
288
289 #undef open
290 int mingw_open (const char *filename, int oflags, ...)
291 {
292 va_list args;
293 unsigned mode;
294 int fd;
295
296 va_start(args, oflags);
297 mode = va_arg(args, int);
298 va_end(args);
299
300 if (!strcmp(filename, "/dev/null"))
301 filename = "nul";
302
303 fd = open(filename, oflags, mode);
304
305 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
306 DWORD attrs = GetFileAttributes(filename);
307 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
308 errno = EISDIR;
309 }
310 if ((oflags & O_CREAT) && fd >= 0 &&
311 hide_dotfiles == HIDE_DOTFILES_TRUE) {
312 /*
313 * In Windows a file or dir starting with a dot is not
314 * automatically hidden. So lets mark it as hidden when
315 * such a file is created.
316 */
317 const char *start = basename((char*)filename);
318 if (*start == '.' && make_hidden(filename))
319 warning("Could not mark '%s' as hidden.", filename);
320 }
321 return fd;
322 }
323
324 #undef write
325 ssize_t mingw_write(int fd, const void *buf, size_t count)
326 {
327 /*
328 * While write() calls to a file on a local disk are translated
329 * into WriteFile() calls with a maximum size of 64KB on Windows
330 * XP and 256KB on Vista, no such cap is placed on writes to
331 * files over the network on Windows XP. Unfortunately, there
332 * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
333 * bigger writes fail on Windows XP.
334 * So we cap to a nice 31MB here to avoid write failures over
335 * the net without changing the number of WriteFile() calls in
336 * the local case.
337 */
338 return write(fd, buf, min(count, 31 * 1024 * 1024));
339 }
340
341 #undef fopen
342 FILE *mingw_fopen (const char *filename, const char *otype)
343 {
344 int hide = 0;
345 FILE *file;
346 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
347 basename((char*)filename)[0] == '.')
348 hide = access(filename, F_OK);
349 if (!strcmp(filename, "/dev/null"))
350 filename = "nul";
351 file = fopen(filename, otype);
352 if (file && hide && make_hidden(filename))
353 warning("Could not mark '%s' as hidden.", filename);
354 return file;
355 }
356
357 #undef freopen
358 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
359 {
360 int hide = 0;
361 FILE *file;
362 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
363 basename((char*)filename)[0] == '.')
364 hide = access(filename, F_OK);
365 if (filename && !strcmp(filename, "/dev/null"))
366 filename = "nul";
367 file = freopen(filename, otype, stream);
368 if (file && hide && make_hidden(filename))
369 warning("Could not mark '%s' as hidden.", filename);
370 return file;
371 }
372
373 /*
374 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
375 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
376 */
377 static inline long long filetime_to_hnsec(const FILETIME *ft)
378 {
379 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
380 /* Windows to Unix Epoch conversion */
381 return winTime - 116444736000000000LL;
382 }
383
384 static inline time_t filetime_to_time_t(const FILETIME *ft)
385 {
386 return (time_t)(filetime_to_hnsec(ft) / 10000000);
387 }
388
389 /* We keep the do_lstat code in a separate function to avoid recursion.
390 * When a path ends with a slash, the stat will fail with ENOENT. In
391 * this case, we strip the trailing slashes and stat again.
392 *
393 * If follow is true then act like stat() and report on the link
394 * target. Otherwise report on the link itself.
395 */
396 static int do_lstat(int follow, const char *file_name, struct stat *buf)
397 {
398 WIN32_FILE_ATTRIBUTE_DATA fdata;
399
400 if (!(errno = get_file_attr(file_name, &fdata))) {
401 buf->st_ino = 0;
402 buf->st_gid = 0;
403 buf->st_uid = 0;
404 buf->st_nlink = 1;
405 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
406 buf->st_size = fdata.nFileSizeLow |
407 (((off_t)fdata.nFileSizeHigh)<<32);
408 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
409 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
410 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
411 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
412 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
413 WIN32_FIND_DATAA findbuf;
414 HANDLE handle = FindFirstFileA(file_name, &findbuf);
415 if (handle != INVALID_HANDLE_VALUE) {
416 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
417 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
418 if (follow) {
419 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
420 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
421 } else {
422 buf->st_mode = S_IFLNK;
423 }
424 buf->st_mode |= S_IREAD;
425 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
426 buf->st_mode |= S_IWRITE;
427 }
428 FindClose(handle);
429 }
430 }
431 return 0;
432 }
433 return -1;
434 }
435
436 /* We provide our own lstat/fstat functions, since the provided
437 * lstat/fstat functions are so slow. These stat functions are
438 * tailored for Git's usage (read: fast), and are not meant to be
439 * complete. Note that Git stat()s are redirected to mingw_lstat()
440 * too, since Windows doesn't really handle symlinks that well.
441 */
442 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
443 {
444 int namelen;
445 static char alt_name[PATH_MAX];
446
447 if (!do_lstat(follow, file_name, buf))
448 return 0;
449
450 /* if file_name ended in a '/', Windows returned ENOENT;
451 * try again without trailing slashes
452 */
453 if (errno != ENOENT)
454 return -1;
455
456 namelen = strlen(file_name);
457 if (namelen && file_name[namelen-1] != '/')
458 return -1;
459 while (namelen && file_name[namelen-1] == '/')
460 --namelen;
461 if (!namelen || namelen >= PATH_MAX)
462 return -1;
463
464 memcpy(alt_name, file_name, namelen);
465 alt_name[namelen] = 0;
466 return do_lstat(follow, alt_name, buf);
467 }
468
469 int mingw_lstat(const char *file_name, struct stat *buf)
470 {
471 return do_stat_internal(0, file_name, buf);
472 }
473 int mingw_stat(const char *file_name, struct stat *buf)
474 {
475 return do_stat_internal(1, file_name, buf);
476 }
477
478 #undef fstat
479 int mingw_fstat(int fd, struct stat *buf)
480 {
481 HANDLE fh = (HANDLE)_get_osfhandle(fd);
482 BY_HANDLE_FILE_INFORMATION fdata;
483
484 if (fh == INVALID_HANDLE_VALUE) {
485 errno = EBADF;
486 return -1;
487 }
488 /* direct non-file handles to MS's fstat() */
489 if (GetFileType(fh) != FILE_TYPE_DISK)
490 return _fstati64(fd, buf);
491
492 if (GetFileInformationByHandle(fh, &fdata)) {
493 buf->st_ino = 0;
494 buf->st_gid = 0;
495 buf->st_uid = 0;
496 buf->st_nlink = 1;
497 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
498 buf->st_size = fdata.nFileSizeLow |
499 (((off_t)fdata.nFileSizeHigh)<<32);
500 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
501 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
502 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
503 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
504 return 0;
505 }
506 errno = EBADF;
507 return -1;
508 }
509
510 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
511 {
512 long long winTime = t * 10000000LL + 116444736000000000LL;
513 ft->dwLowDateTime = winTime;
514 ft->dwHighDateTime = winTime >> 32;
515 }
516
517 int mingw_utime (const char *file_name, const struct utimbuf *times)
518 {
519 FILETIME mft, aft;
520 int fh, rc;
521
522 /* must have write permission */
523 DWORD attrs = GetFileAttributes(file_name);
524 if (attrs != INVALID_FILE_ATTRIBUTES &&
525 (attrs & FILE_ATTRIBUTE_READONLY)) {
526 /* ignore errors here; open() will report them */
527 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
528 }
529
530 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
531 rc = -1;
532 goto revert_attrs;
533 }
534
535 time_t_to_filetime(times->modtime, &mft);
536 time_t_to_filetime(times->actime, &aft);
537 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
538 errno = EINVAL;
539 rc = -1;
540 } else
541 rc = 0;
542 close(fh);
543
544 revert_attrs:
545 if (attrs != INVALID_FILE_ATTRIBUTES &&
546 (attrs & FILE_ATTRIBUTE_READONLY)) {
547 /* ignore errors again */
548 SetFileAttributes(file_name, attrs);
549 }
550 return rc;
551 }
552
553 unsigned int sleep (unsigned int seconds)
554 {
555 Sleep(seconds*1000);
556 return 0;
557 }
558
559 int mkstemp(char *template)
560 {
561 char *filename = mktemp(template);
562 if (filename == NULL)
563 return -1;
564 return open(filename, O_RDWR | O_CREAT, 0600);
565 }
566
567 int gettimeofday(struct timeval *tv, void *tz)
568 {
569 FILETIME ft;
570 long long hnsec;
571
572 GetSystemTimeAsFileTime(&ft);
573 hnsec = filetime_to_hnsec(&ft);
574 tv->tv_sec = hnsec / 10000000;
575 tv->tv_usec = (hnsec % 10000000) / 10;
576 return 0;
577 }
578
579 int pipe(int filedes[2])
580 {
581 HANDLE h[2];
582
583 /* this creates non-inheritable handles */
584 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
585 errno = err_win_to_posix(GetLastError());
586 return -1;
587 }
588 filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
589 if (filedes[0] < 0) {
590 CloseHandle(h[0]);
591 CloseHandle(h[1]);
592 return -1;
593 }
594 filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
595 if (filedes[0] < 0) {
596 close(filedes[0]);
597 CloseHandle(h[1]);
598 return -1;
599 }
600 return 0;
601 }
602
603 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
604 {
605 int i, pending;
606
607 if (timeout >= 0) {
608 if (nfds == 0) {
609 Sleep(timeout);
610 return 0;
611 }
612 return errno = EINVAL, error("poll timeout not supported");
613 }
614
615 /* When there is only one fd to wait for, then we pretend that
616 * input is available and let the actual wait happen when the
617 * caller invokes read().
618 */
619 if (nfds == 1) {
620 if (!(ufds[0].events & POLLIN))
621 return errno = EINVAL, error("POLLIN not set");
622 ufds[0].revents = POLLIN;
623 return 0;
624 }
625
626 repeat:
627 pending = 0;
628 for (i = 0; i < nfds; i++) {
629 DWORD avail = 0;
630 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
631 if (h == INVALID_HANDLE_VALUE)
632 return -1; /* errno was set */
633
634 if (!(ufds[i].events & POLLIN))
635 return errno = EINVAL, error("POLLIN not set");
636
637 /* this emulation works only for pipes */
638 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
639 int err = GetLastError();
640 if (err == ERROR_BROKEN_PIPE) {
641 ufds[i].revents = POLLHUP;
642 pending++;
643 } else {
644 errno = EINVAL;
645 return error("PeekNamedPipe failed,"
646 " GetLastError: %u", err);
647 }
648 } else if (avail) {
649 ufds[i].revents = POLLIN;
650 pending++;
651 } else
652 ufds[i].revents = 0;
653 }
654 if (!pending) {
655 /* The only times that we spin here is when the process
656 * that is connected through the pipes is waiting for
657 * its own input data to become available. But since
658 * the process (pack-objects) is itself CPU intensive,
659 * it will happily pick up the time slice that we are
660 * relinquishing here.
661 */
662 Sleep(0);
663 goto repeat;
664 }
665 return 0;
666 }
667
668 struct tm *gmtime_r(const time_t *timep, struct tm *result)
669 {
670 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
671 memcpy(result, gmtime(timep), sizeof(struct tm));
672 return result;
673 }
674
675 struct tm *localtime_r(const time_t *timep, struct tm *result)
676 {
677 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
678 memcpy(result, localtime(timep), sizeof(struct tm));
679 return result;
680 }
681
682 #undef getcwd
683 char *mingw_getcwd(char *pointer, int len)
684 {
685 int i;
686 char *ret = getcwd(pointer, len);
687 if (!ret)
688 return ret;
689 for (i = 0; pointer[i]; i++)
690 if (pointer[i] == '\\')
691 pointer[i] = '/';
692 return ret;
693 }
694
695 #undef getenv
696 char *mingw_getenv(const char *name)
697 {
698 char *result = getenv(name);
699 if (!result && !strcmp(name, "TMPDIR")) {
700 /* on Windows it is TMP and TEMP */
701 result = getenv("TMP");
702 if (!result)
703 result = getenv("TEMP");
704 }
705 return result;
706 }
707
708 /*
709 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
710 * (Parsing C++ Command-Line Arguments)
711 */
712 static const char *quote_arg(const char *arg)
713 {
714 /* count chars to quote */
715 int len = 0, n = 0;
716 int force_quotes = 0;
717 char *q, *d;
718 const char *p = arg;
719 if (!*p) force_quotes = 1;
720 while (*p) {
721 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
722 force_quotes = 1;
723 else if (*p == '"')
724 n++;
725 else if (*p == '\\') {
726 int count = 0;
727 while (*p == '\\') {
728 count++;
729 p++;
730 len++;
731 }
732 if (*p == '"')
733 n += count*2 + 1;
734 continue;
735 }
736 len++;
737 p++;
738 }
739 if (!force_quotes && n == 0)
740 return arg;
741
742 /* insert \ where necessary */
743 d = q = xmalloc(len+n+3);
744 *d++ = '"';
745 while (*arg) {
746 if (*arg == '"')
747 *d++ = '\\';
748 else if (*arg == '\\') {
749 int count = 0;
750 while (*arg == '\\') {
751 count++;
752 *d++ = *arg++;
753 }
754 if (*arg == '"') {
755 while (count-- > 0)
756 *d++ = '\\';
757 *d++ = '\\';
758 }
759 }
760 *d++ = *arg++;
761 }
762 *d++ = '"';
763 *d++ = 0;
764 return q;
765 }
766
767 static const char *parse_interpreter(const char *cmd)
768 {
769 static char buf[100];
770 char *p, *opt;
771 int n, fd;
772
773 /* don't even try a .exe */
774 n = strlen(cmd);
775 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
776 return NULL;
777
778 fd = open(cmd, O_RDONLY);
779 if (fd < 0)
780 return NULL;
781 n = read(fd, buf, sizeof(buf)-1);
782 close(fd);
783 if (n < 4) /* at least '#!/x' and not error */
784 return NULL;
785
786 if (buf[0] != '#' || buf[1] != '!')
787 return NULL;
788 buf[n] = '\0';
789 p = buf + strcspn(buf, "\r\n");
790 if (!*p)
791 return NULL;
792
793 *p = '\0';
794 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
795 return NULL;
796 /* strip options */
797 if ((opt = strchr(p+1, ' ')))
798 *opt = '\0';
799 return p+1;
800 }
801
802 /*
803 * Splits the PATH into parts.
804 */
805 static char **get_path_split(void)
806 {
807 char *p, **path, *envpath = getenv("PATH");
808 int i, n = 0;
809
810 if (!envpath || !*envpath)
811 return NULL;
812
813 envpath = xstrdup(envpath);
814 p = envpath;
815 while (p) {
816 char *dir = p;
817 p = strchr(p, ';');
818 if (p) *p++ = '\0';
819 if (*dir) { /* not earlier, catches series of ; */
820 ++n;
821 }
822 }
823 if (!n)
824 return NULL;
825
826 path = xmalloc((n+1)*sizeof(char *));
827 p = envpath;
828 i = 0;
829 do {
830 if (*p)
831 path[i++] = xstrdup(p);
832 p = p+strlen(p)+1;
833 } while (i < n);
834 path[i] = NULL;
835
836 free(envpath);
837
838 return path;
839 }
840
841 static void free_path_split(char **path)
842 {
843 char **p = path;
844
845 if (!path)
846 return;
847
848 while (*p)
849 free(*p++);
850 free(path);
851 }
852
853 /*
854 * exe_only means that we only want to detect .exe files, but not scripts
855 * (which do not have an extension)
856 */
857 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
858 {
859 char path[MAX_PATH];
860 snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
861
862 if (!isexe && access(path, F_OK) == 0)
863 return xstrdup(path);
864 path[strlen(path)-4] = '\0';
865 if ((!exe_only || isexe) && access(path, F_OK) == 0)
866 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
867 return xstrdup(path);
868 return NULL;
869 }
870
871 /*
872 * Determines the absolute path of cmd using the the split path in path.
873 * If cmd contains a slash or backslash, no lookup is performed.
874 */
875 static char *path_lookup(const char *cmd, char **path, int exe_only)
876 {
877 char *prog = NULL;
878 int len = strlen(cmd);
879 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
880
881 if (strchr(cmd, '/') || strchr(cmd, '\\'))
882 prog = xstrdup(cmd);
883
884 while (!prog && *path)
885 prog = lookup_prog(*path++, cmd, isexe, exe_only);
886
887 return prog;
888 }
889
890 static int env_compare(const void *a, const void *b)
891 {
892 char *const *ea = a;
893 char *const *eb = b;
894 return strcasecmp(*ea, *eb);
895 }
896
897 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
898 const char *dir,
899 int prepend_cmd, int fhin, int fhout, int fherr)
900 {
901 STARTUPINFO si;
902 PROCESS_INFORMATION pi;
903 struct strbuf envblk, args;
904 unsigned flags;
905 BOOL ret;
906
907 /* Determine whether or not we are associated to a console */
908 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
909 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
910 FILE_ATTRIBUTE_NORMAL, NULL);
911 if (cons == INVALID_HANDLE_VALUE) {
912 /* There is no console associated with this process.
913 * Since the child is a console process, Windows
914 * would normally create a console window. But
915 * since we'll be redirecting std streams, we do
916 * not need the console.
917 * It is necessary to use DETACHED_PROCESS
918 * instead of CREATE_NO_WINDOW to make ssh
919 * recognize that it has no console.
920 */
921 flags = DETACHED_PROCESS;
922 } else {
923 /* There is already a console. If we specified
924 * DETACHED_PROCESS here, too, Windows would
925 * disassociate the child from the console.
926 * The same is true for CREATE_NO_WINDOW.
927 * Go figure!
928 */
929 flags = 0;
930 CloseHandle(cons);
931 }
932 memset(&si, 0, sizeof(si));
933 si.cb = sizeof(si);
934 si.dwFlags = STARTF_USESTDHANDLES;
935 si.hStdInput = (HANDLE) _get_osfhandle(fhin);
936 si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
937 si.hStdError = (HANDLE) _get_osfhandle(fherr);
938
939 /* concatenate argv, quoting args as we go */
940 strbuf_init(&args, 0);
941 if (prepend_cmd) {
942 char *quoted = (char *)quote_arg(cmd);
943 strbuf_addstr(&args, quoted);
944 if (quoted != cmd)
945 free(quoted);
946 }
947 for (; *argv; argv++) {
948 char *quoted = (char *)quote_arg(*argv);
949 if (*args.buf)
950 strbuf_addch(&args, ' ');
951 strbuf_addstr(&args, quoted);
952 if (quoted != *argv)
953 free(quoted);
954 }
955
956 if (env) {
957 int count = 0;
958 char **e, **sorted_env;
959
960 for (e = env; *e; e++)
961 count++;
962
963 /* environment must be sorted */
964 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
965 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
966 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
967
968 strbuf_init(&envblk, 0);
969 for (e = sorted_env; *e; e++) {
970 strbuf_addstr(&envblk, *e);
971 strbuf_addch(&envblk, '\0');
972 }
973 free(sorted_env);
974 }
975
976 memset(&pi, 0, sizeof(pi));
977 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
978 env ? envblk.buf : NULL, dir, &si, &pi);
979
980 if (env)
981 strbuf_release(&envblk);
982 strbuf_release(&args);
983
984 if (!ret) {
985 errno = ENOENT;
986 return -1;
987 }
988 CloseHandle(pi.hThread);
989 return (pid_t)pi.hProcess;
990 }
991
992 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
993 int prepend_cmd)
994 {
995 return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
996 }
997
998 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
999 const char *dir,
1000 int fhin, int fhout, int fherr)
1001 {
1002 pid_t pid;
1003 char **path = get_path_split();
1004 char *prog = path_lookup(cmd, path, 0);
1005
1006 if (!prog) {
1007 errno = ENOENT;
1008 pid = -1;
1009 }
1010 else {
1011 const char *interpr = parse_interpreter(prog);
1012
1013 if (interpr) {
1014 const char *argv0 = argv[0];
1015 char *iprog = path_lookup(interpr, path, 1);
1016 argv[0] = prog;
1017 if (!iprog) {
1018 errno = ENOENT;
1019 pid = -1;
1020 }
1021 else {
1022 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1023 fhin, fhout, fherr);
1024 free(iprog);
1025 }
1026 argv[0] = argv0;
1027 }
1028 else
1029 pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1030 fhin, fhout, fherr);
1031 free(prog);
1032 }
1033 free_path_split(path);
1034 return pid;
1035 }
1036
1037 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1038 {
1039 const char *interpr = parse_interpreter(cmd);
1040 char **path;
1041 char *prog;
1042 int pid = 0;
1043
1044 if (!interpr)
1045 return 0;
1046 path = get_path_split();
1047 prog = path_lookup(interpr, path, 1);
1048 if (prog) {
1049 int argc = 0;
1050 const char **argv2;
1051 while (argv[argc]) argc++;
1052 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1053 argv2[0] = (char *)cmd; /* full path to the script file */
1054 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1055 pid = mingw_spawnve(prog, argv2, env, 1);
1056 if (pid >= 0) {
1057 int status;
1058 if (waitpid(pid, &status, 0) < 0)
1059 status = 255;
1060 exit(status);
1061 }
1062 pid = 1; /* indicate that we tried but failed */
1063 free(prog);
1064 free(argv2);
1065 }
1066 free_path_split(path);
1067 return pid;
1068 }
1069
1070 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1071 {
1072 /* check if git_command is a shell script */
1073 if (!try_shell_exec(cmd, argv, (char **)env)) {
1074 int pid, status;
1075
1076 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1077 if (pid < 0)
1078 return;
1079 if (waitpid(pid, &status, 0) < 0)
1080 status = 255;
1081 exit(status);
1082 }
1083 }
1084
1085 void mingw_execvp(const char *cmd, char *const *argv)
1086 {
1087 char **path = get_path_split();
1088 char *prog = path_lookup(cmd, path, 0);
1089
1090 if (prog) {
1091 mingw_execve(prog, argv, environ);
1092 free(prog);
1093 } else
1094 errno = ENOENT;
1095
1096 free_path_split(path);
1097 }
1098
1099 static char **copy_environ(void)
1100 {
1101 char **env;
1102 int i = 0;
1103 while (environ[i])
1104 i++;
1105 env = xmalloc((i+1)*sizeof(*env));
1106 for (i = 0; environ[i]; i++)
1107 env[i] = xstrdup(environ[i]);
1108 env[i] = NULL;
1109 return env;
1110 }
1111
1112 void free_environ(char **env)
1113 {
1114 int i;
1115 for (i = 0; env[i]; i++)
1116 free(env[i]);
1117 free(env);
1118 }
1119
1120 static int lookup_env(char **env, const char *name, size_t nmln)
1121 {
1122 int i;
1123
1124 for (i = 0; env[i]; i++) {
1125 if (0 == strncmp(env[i], name, nmln)
1126 && '=' == env[i][nmln])
1127 /* matches */
1128 return i;
1129 }
1130 return -1;
1131 }
1132
1133 /*
1134 * If name contains '=', then sets the variable, otherwise it unsets it
1135 */
1136 static char **env_setenv(char **env, const char *name)
1137 {
1138 char *eq = strchrnul(name, '=');
1139 int i = lookup_env(env, name, eq-name);
1140
1141 if (i < 0) {
1142 if (*eq) {
1143 for (i = 0; env[i]; i++)
1144 ;
1145 env = xrealloc(env, (i+2)*sizeof(*env));
1146 env[i] = xstrdup(name);
1147 env[i+1] = NULL;
1148 }
1149 }
1150 else {
1151 free(env[i]);
1152 if (*eq)
1153 env[i] = xstrdup(name);
1154 else
1155 for (; env[i]; i++)
1156 env[i] = env[i+1];
1157 }
1158 return env;
1159 }
1160
1161 /*
1162 * Copies global environ and adjusts variables as specified by vars.
1163 */
1164 char **make_augmented_environ(const char *const *vars)
1165 {
1166 char **env = copy_environ();
1167
1168 while (*vars)
1169 env = env_setenv(env, *vars++);
1170 return env;
1171 }
1172
1173 /*
1174 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1175 * that service contains a numerical port, or that it it is null. It
1176 * does a simple search using gethostbyname, and returns one IPv4 host
1177 * if one was found.
1178 */
1179 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1180 const struct addrinfo *hints,
1181 struct addrinfo **res)
1182 {
1183 struct hostent *h = gethostbyname(node);
1184 struct addrinfo *ai;
1185 struct sockaddr_in *sin;
1186
1187 if (!h)
1188 return WSAGetLastError();
1189
1190 ai = xmalloc(sizeof(struct addrinfo));
1191 *res = ai;
1192 ai->ai_flags = 0;
1193 ai->ai_family = AF_INET;
1194 ai->ai_socktype = hints->ai_socktype;
1195 switch (hints->ai_socktype) {
1196 case SOCK_STREAM:
1197 ai->ai_protocol = IPPROTO_TCP;
1198 break;
1199 case SOCK_DGRAM:
1200 ai->ai_protocol = IPPROTO_UDP;
1201 break;
1202 default:
1203 ai->ai_protocol = 0;
1204 break;
1205 }
1206 ai->ai_addrlen = sizeof(struct sockaddr_in);
1207 ai->ai_canonname = strdup(h->h_name);
1208
1209 sin = xmalloc(ai->ai_addrlen);
1210 memset(sin, 0, ai->ai_addrlen);
1211 sin->sin_family = AF_INET;
1212 if (service)
1213 sin->sin_port = htons(atoi(service));
1214 sin->sin_addr = *(struct in_addr *)h->h_addr;
1215 ai->ai_addr = (struct sockaddr *)sin;
1216 ai->ai_next = 0;
1217 return 0;
1218 }
1219
1220 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1221 {
1222 free(res->ai_canonname);
1223 free(res->ai_addr);
1224 free(res);
1225 }
1226
1227 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1228 char *host, DWORD hostlen,
1229 char *serv, DWORD servlen, int flags)
1230 {
1231 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1232 if (sa->sa_family != AF_INET)
1233 return EAI_FAMILY;
1234 if (!host && !serv)
1235 return EAI_NONAME;
1236
1237 if (host && hostlen > 0) {
1238 struct hostent *ent = NULL;
1239 if (!(flags & NI_NUMERICHOST))
1240 ent = gethostbyaddr((const char *)&sin->sin_addr,
1241 sizeof(sin->sin_addr), AF_INET);
1242
1243 if (ent)
1244 snprintf(host, hostlen, "%s", ent->h_name);
1245 else if (flags & NI_NAMEREQD)
1246 return EAI_NONAME;
1247 else
1248 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1249 }
1250
1251 if (serv && servlen > 0) {
1252 struct servent *ent = NULL;
1253 if (!(flags & NI_NUMERICSERV))
1254 ent = getservbyport(sin->sin_port,
1255 flags & NI_DGRAM ? "udp" : "tcp");
1256
1257 if (ent)
1258 snprintf(serv, servlen, "%s", ent->s_name);
1259 else
1260 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1261 }
1262
1263 return 0;
1264 }
1265
1266 static HMODULE ipv6_dll = NULL;
1267 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1268 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1269 const struct addrinfo *hints,
1270 struct addrinfo **res);
1271 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1272 char *host, DWORD hostlen,
1273 char *serv, DWORD servlen, int flags);
1274 /*
1275 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1276 * don't need to try to load that one dynamically.
1277 */
1278
1279 static void socket_cleanup(void)
1280 {
1281 WSACleanup();
1282 if (ipv6_dll)
1283 FreeLibrary(ipv6_dll);
1284 ipv6_dll = NULL;
1285 ipv6_freeaddrinfo = freeaddrinfo_stub;
1286 ipv6_getaddrinfo = getaddrinfo_stub;
1287 ipv6_getnameinfo = getnameinfo_stub;
1288 }
1289
1290 static void ensure_socket_initialization(void)
1291 {
1292 WSADATA wsa;
1293 static int initialized = 0;
1294 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1295 const char **name;
1296
1297 if (initialized)
1298 return;
1299
1300 if (WSAStartup(MAKEWORD(2,2), &wsa))
1301 die("unable to initialize winsock subsystem, error %d",
1302 WSAGetLastError());
1303
1304 for (name = libraries; *name; name++) {
1305 ipv6_dll = LoadLibrary(*name);
1306 if (!ipv6_dll)
1307 continue;
1308
1309 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1310 GetProcAddress(ipv6_dll, "freeaddrinfo");
1311 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1312 const struct addrinfo *,
1313 struct addrinfo **))
1314 GetProcAddress(ipv6_dll, "getaddrinfo");
1315 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1316 socklen_t, char *, DWORD,
1317 char *, DWORD, int))
1318 GetProcAddress(ipv6_dll, "getnameinfo");
1319 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1320 FreeLibrary(ipv6_dll);
1321 ipv6_dll = NULL;
1322 } else
1323 break;
1324 }
1325 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1326 ipv6_freeaddrinfo = freeaddrinfo_stub;
1327 ipv6_getaddrinfo = getaddrinfo_stub;
1328 ipv6_getnameinfo = getnameinfo_stub;
1329 }
1330
1331 atexit(socket_cleanup);
1332 initialized = 1;
1333 }
1334
1335 #undef gethostbyname
1336 struct hostent *mingw_gethostbyname(const char *host)
1337 {
1338 ensure_socket_initialization();
1339 return gethostbyname(host);
1340 }
1341
1342 void mingw_freeaddrinfo(struct addrinfo *res)
1343 {
1344 ipv6_freeaddrinfo(res);
1345 }
1346
1347 int mingw_getaddrinfo(const char *node, const char *service,
1348 const struct addrinfo *hints, struct addrinfo **res)
1349 {
1350 ensure_socket_initialization();
1351 return ipv6_getaddrinfo(node, service, hints, res);
1352 }
1353
1354 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1355 char *host, DWORD hostlen, char *serv, DWORD servlen,
1356 int flags)
1357 {
1358 ensure_socket_initialization();
1359 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1360 }
1361
1362 int mingw_socket(int domain, int type, int protocol)
1363 {
1364 int sockfd;
1365 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1366 if (s == INVALID_SOCKET) {
1367 /*
1368 * WSAGetLastError() values are regular BSD error codes
1369 * biased by WSABASEERR.
1370 * However, strerror() does not know about networking
1371 * specific errors, which are values beginning at 38 or so.
1372 * Therefore, we choose to leave the biased error code
1373 * in errno so that _if_ someone looks up the code somewhere,
1374 * then it is at least the number that are usually listed.
1375 */
1376 errno = WSAGetLastError();
1377 return -1;
1378 }
1379 /* convert into a file descriptor */
1380 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1381 closesocket(s);
1382 return error("unable to make a socket file descriptor: %s",
1383 strerror(errno));
1384 }
1385 return sockfd;
1386 }
1387
1388 #undef connect
1389 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1390 {
1391 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1392 return connect(s, sa, sz);
1393 }
1394
1395 #undef rename
1396 int mingw_rename(const char *pold, const char *pnew)
1397 {
1398 DWORD attrs, gle;
1399 int tries = 0;
1400
1401 /*
1402 * Try native rename() first to get errno right.
1403 * It is based on MoveFile(), which cannot overwrite existing files.
1404 */
1405 if (!rename(pold, pnew))
1406 return 0;
1407 if (errno != EEXIST)
1408 return -1;
1409 repeat:
1410 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1411 return 0;
1412 /* TODO: translate more errors */
1413 gle = GetLastError();
1414 if (gle == ERROR_ACCESS_DENIED &&
1415 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1416 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1417 errno = EISDIR;
1418 return -1;
1419 }
1420 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1421 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1422 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1423 return 0;
1424 gle = GetLastError();
1425 /* revert file attributes on failure */
1426 SetFileAttributes(pnew, attrs);
1427 }
1428 }
1429 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1430 /*
1431 * We assume that some other process had the source or
1432 * destination file open at the wrong moment and retry.
1433 * In order to give the other process a higher chance to
1434 * complete its operation, we give up our time slice now.
1435 * If we have to retry again, we do sleep a bit.
1436 */
1437 Sleep(delay[tries]);
1438 tries++;
1439 goto repeat;
1440 }
1441 if (gle == ERROR_ACCESS_DENIED &&
1442 ask_user_yes_no("Rename from '%s' to '%s' failed. "
1443 "Should I try again?", pold, pnew))
1444 goto repeat;
1445
1446 errno = EACCES;
1447 return -1;
1448 }
1449
1450 /*
1451 * Note that this doesn't return the actual pagesize, but
1452 * the allocation granularity. If future Windows specific git code
1453 * needs the real getpagesize function, we need to find another solution.
1454 */
1455 int mingw_getpagesize(void)
1456 {
1457 SYSTEM_INFO si;
1458 GetSystemInfo(&si);
1459 return si.dwAllocationGranularity;
1460 }
1461
1462 struct passwd *getpwuid(int uid)
1463 {
1464 static char user_name[100];
1465 static struct passwd p;
1466
1467 DWORD len = sizeof(user_name);
1468 if (!GetUserName(user_name, &len))
1469 return NULL;
1470 p.pw_name = user_name;
1471 p.pw_gecos = "unknown";
1472 p.pw_dir = NULL;
1473 return &p;
1474 }
1475
1476 static HANDLE timer_event;
1477 static HANDLE timer_thread;
1478 static int timer_interval;
1479 static int one_shot;
1480 static sig_handler_t timer_fn = SIG_DFL;
1481
1482 /* The timer works like this:
1483 * The thread, ticktack(), is a trivial routine that most of the time
1484 * only waits to receive the signal to terminate. The main thread tells
1485 * the thread to terminate by setting the timer_event to the signalled
1486 * state.
1487 * But ticktack() interrupts the wait state after the timer's interval
1488 * length to call the signal handler.
1489 */
1490
1491 static unsigned __stdcall ticktack(void *dummy)
1492 {
1493 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1494 if (timer_fn == SIG_DFL)
1495 die("Alarm");
1496 if (timer_fn != SIG_IGN)
1497 timer_fn(SIGALRM);
1498 if (one_shot)
1499 break;
1500 }
1501 return 0;
1502 }
1503
1504 static int start_timer_thread(void)
1505 {
1506 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1507 if (timer_event) {
1508 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1509 if (!timer_thread )
1510 return errno = ENOMEM,
1511 error("cannot start timer thread");
1512 } else
1513 return errno = ENOMEM,
1514 error("cannot allocate resources for timer");
1515 return 0;
1516 }
1517
1518 static void stop_timer_thread(void)
1519 {
1520 if (timer_event)
1521 SetEvent(timer_event); /* tell thread to terminate */
1522 if (timer_thread) {
1523 int rc = WaitForSingleObject(timer_thread, 1000);
1524 if (rc == WAIT_TIMEOUT)
1525 error("timer thread did not terminate timely");
1526 else if (rc != WAIT_OBJECT_0)
1527 error("waiting for timer thread failed: %lu",
1528 GetLastError());
1529 CloseHandle(timer_thread);
1530 }
1531 if (timer_event)
1532 CloseHandle(timer_event);
1533 timer_event = NULL;
1534 timer_thread = NULL;
1535 }
1536
1537 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1538 {
1539 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1540 }
1541
1542 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1543 {
1544 static const struct timeval zero;
1545 static int atexit_done;
1546
1547 if (out != NULL)
1548 return errno = EINVAL,
1549 error("setitimer param 3 != NULL not implemented");
1550 if (!is_timeval_eq(&in->it_interval, &zero) &&
1551 !is_timeval_eq(&in->it_interval, &in->it_value))
1552 return errno = EINVAL,
1553 error("setitimer: it_interval must be zero or eq it_value");
1554
1555 if (timer_thread)
1556 stop_timer_thread();
1557
1558 if (is_timeval_eq(&in->it_value, &zero) &&
1559 is_timeval_eq(&in->it_interval, &zero))
1560 return 0;
1561
1562 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1563 one_shot = is_timeval_eq(&in->it_interval, &zero);
1564 if (!atexit_done) {
1565 atexit(stop_timer_thread);
1566 atexit_done = 1;
1567 }
1568 return start_timer_thread();
1569 }
1570
1571 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1572 {
1573 if (sig != SIGALRM)
1574 return errno = EINVAL,
1575 error("sigaction only implemented for SIGALRM");
1576 if (out != NULL)
1577 return errno = EINVAL,
1578 error("sigaction: param 3 != NULL not implemented");
1579
1580 timer_fn = in->sa_handler;
1581 return 0;
1582 }
1583
1584 #undef signal
1585 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1586 {
1587 sig_handler_t old = timer_fn;
1588 if (sig != SIGALRM)
1589 return signal(sig, handler);
1590 timer_fn = handler;
1591 return old;
1592 }
1593
1594 static const char *make_backslash_path(const char *path)
1595 {
1596 static char buf[PATH_MAX + 1];
1597 char *c;
1598
1599 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1600 die("Too long path: %.*s", 60, path);
1601
1602 for (c = buf; *c; c++) {
1603 if (*c == '/')
1604 *c = '\\';
1605 }
1606 return buf;
1607 }
1608
1609 void mingw_open_html(const char *unixpath)
1610 {
1611 const char *htmlpath = make_backslash_path(unixpath);
1612 typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1613 const char *, const char *, const char *, INT);
1614 T ShellExecute;
1615 HMODULE shell32;
1616 int r;
1617
1618 shell32 = LoadLibrary("shell32.dll");
1619 if (!shell32)
1620 die("cannot load shell32.dll");
1621 ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1622 if (!ShellExecute)
1623 die("cannot run browser");
1624
1625 printf("Launching default browser to display HTML ...\n");
1626 r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1627 FreeLibrary(shell32);
1628 /* see the MSDN documentation referring to the result codes here */
1629 if (r <= 32) {
1630 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1631 }
1632 }
1633
1634 int link(const char *oldpath, const char *newpath)
1635 {
1636 typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1637 static T create_hard_link = NULL;
1638 if (!create_hard_link) {
1639 create_hard_link = (T) GetProcAddress(
1640 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1641 if (!create_hard_link)
1642 create_hard_link = (T)-1;
1643 }
1644 if (create_hard_link == (T)-1) {
1645 errno = ENOSYS;
1646 return -1;
1647 }
1648 if (!create_hard_link(newpath, oldpath, NULL)) {
1649 errno = err_win_to_posix(GetLastError());
1650 return -1;
1651 }
1652 return 0;
1653 }
1654
1655 char *getpass(const char *prompt)
1656 {
1657 struct strbuf buf = STRBUF_INIT;
1658
1659 fputs(prompt, stderr);
1660 for (;;) {
1661 char c = _getch();
1662 if (c == '\r' || c == '\n')
1663 break;
1664 strbuf_addch(&buf, c);
1665 }
1666 fputs("\n", stderr);
1667 return strbuf_detach(&buf, NULL);
1668 }
1669
1670 #ifndef NO_MINGW_REPLACE_READDIR
1671 /* MinGW readdir implementation to avoid extra lstats for Git */
1672 struct mingw_DIR
1673 {
1674 struct _finddata_t dd_dta; /* disk transfer area for this dir */
1675 struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
1676 long dd_handle; /* _findnext handle */
1677 int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1678 char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
1679 };
1680
1681 struct dirent *mingw_readdir(DIR *dir)
1682 {
1683 WIN32_FIND_DATAA buf;
1684 HANDLE handle;
1685 struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1686
1687 if (!dir->dd_handle) {
1688 errno = EBADF; /* No set_errno for mingw */
1689 return NULL;
1690 }
1691
1692 if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1693 {
1694 DWORD lasterr;
1695 handle = FindFirstFileA(dir->dd_name, &buf);
1696 lasterr = GetLastError();
1697 dir->dd_handle = (long)handle;
1698 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1699 errno = err_win_to_posix(lasterr);
1700 return NULL;
1701 }
1702 } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1703 return NULL;
1704 } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1705 DWORD lasterr = GetLastError();
1706 FindClose((HANDLE)dir->dd_handle);
1707 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1708 /* POSIX says you shouldn't set errno when readdir can't
1709 find any more files; so, if another error we leave it set. */
1710 if (lasterr != ERROR_NO_MORE_FILES)
1711 errno = err_win_to_posix(lasterr);
1712 return NULL;
1713 }
1714
1715 /* We get here if `buf' contains valid data. */
1716 strcpy(dir->dd_dir.d_name, buf.cFileName);
1717 ++dir->dd_stat;
1718
1719 /* Set file type, based on WIN32_FIND_DATA */
1720 mdir->dd_dir.d_type = 0;
1721 if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1722 mdir->dd_dir.d_type |= DT_DIR;
1723 else
1724 mdir->dd_dir.d_type |= DT_REG;
1725
1726 return (struct dirent*)&dir->dd_dir;
1727 }
1728 #endif // !NO_MINGW_REPLACE_READDIR
1729
1730 const char *get_windows_home_directory()
1731 {
1732 static const char *home_directory = NULL;
1733 struct strbuf buf = STRBUF_INIT;
1734
1735 if (home_directory)
1736 return home_directory;
1737
1738 home_directory = getenv("HOME");
1739 if (home_directory && *home_directory)
1740 return home_directory;
1741
1742 strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1743 home_directory = strbuf_detach(&buf, NULL);
1744
1745 return home_directory;
1746 }
1747
1748 int mingw_offset_1st_component(const char *path)
1749 {
1750 if (has_dos_drive_prefix(path))
1751 return 2 + is_dir_sep(path[2]);
1752
1753 /* unc paths */
1754 if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1755
1756 /* skip server name */
1757 char *pos = strpbrk(path + 2, "\\/");
1758 if (!pos)
1759 return 0;
1760
1761 do {
1762 pos++;
1763 } while (*pos && !is_dir_sep(*pos));
1764
1765 return pos - path;
1766 }
1767
1768 return is_dir_sep(path[0]);
1769 }
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