Windows: Work around intermittent failures in mingw_rename
[git/git.git] / compat / mingw.c
CommitLineData
f4626df5 1#include "../git-compat-util.h"
444dc903 2#include "win32.h"
7e5d7768 3#include "../strbuf.h"
f4626df5
JS
4
5unsigned int _CRT_fmode = _O_BINARY;
6
b3debd2b
PK
7static int err_win_to_posix(DWORD winerr)
8{
9 int error = ENOSYS;
10 switch(winerr) {
11 case ERROR_ACCESS_DENIED: error = EACCES; break;
12 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
13 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
14 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
15 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
16 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
17 case ERROR_BAD_COMMAND: error = EIO; break;
18 case ERROR_BAD_DEVICE: error = ENODEV; break;
19 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
20 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
21 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
22 case ERROR_BAD_LENGTH: error = EINVAL; break;
23 case ERROR_BAD_PATHNAME: error = ENOENT; break;
24 case ERROR_BAD_PIPE: error = EPIPE; break;
25 case ERROR_BAD_UNIT: error = ENODEV; break;
26 case ERROR_BAD_USERNAME: error = EINVAL; break;
27 case ERROR_BROKEN_PIPE: error = EPIPE; break;
28 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
29 case ERROR_BUSY: error = EBUSY; break;
30 case ERROR_BUSY_DRIVE: error = EBUSY; break;
31 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
32 case ERROR_CANNOT_MAKE: error = EACCES; break;
33 case ERROR_CANTOPEN: error = EIO; break;
34 case ERROR_CANTREAD: error = EIO; break;
35 case ERROR_CANTWRITE: error = EIO; break;
36 case ERROR_CRC: error = EIO; break;
37 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
38 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
39 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
40 case ERROR_DIRECTORY: error = EINVAL; break;
41 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
42 case ERROR_DISK_CHANGE: error = EIO; break;
43 case ERROR_DISK_FULL: error = ENOSPC; break;
44 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
45 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
46 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
47 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
48 case ERROR_FILE_EXISTS: error = EEXIST; break;
49 case ERROR_FILE_INVALID: error = ENODEV; break;
50 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
51 case ERROR_GEN_FAILURE: error = EIO; break;
52 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
53 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
54 case ERROR_INVALID_ACCESS: error = EACCES; break;
55 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
56 case ERROR_INVALID_BLOCK: error = EFAULT; break;
57 case ERROR_INVALID_DATA: error = EINVAL; break;
58 case ERROR_INVALID_DRIVE: error = ENODEV; break;
59 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
60 case ERROR_INVALID_FLAGS: error = EINVAL; break;
61 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
62 case ERROR_INVALID_HANDLE: error = EBADF; break;
63 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
64 case ERROR_INVALID_NAME: error = EINVAL; break;
65 case ERROR_INVALID_OWNER: error = EINVAL; break;
66 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
67 case ERROR_INVALID_PASSWORD: error = EPERM; break;
68 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
69 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
70 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
71 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
72 case ERROR_IO_DEVICE: error = EIO; break;
73 case ERROR_IO_INCOMPLETE: error = EINTR; break;
74 case ERROR_LOCKED: error = EBUSY; break;
75 case ERROR_LOCK_VIOLATION: error = EACCES; break;
76 case ERROR_LOGON_FAILURE: error = EACCES; break;
77 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
78 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
79 case ERROR_MORE_DATA: error = EPIPE; break;
80 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
81 case ERROR_NOACCESS: error = EFAULT; break;
82 case ERROR_NONE_MAPPED: error = EINVAL; break;
83 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
84 case ERROR_NOT_READY: error = EAGAIN; break;
85 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
86 case ERROR_NO_DATA: error = EPIPE; break;
87 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
88 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
89 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
90 case ERROR_OPEN_FAILED: error = EIO; break;
91 case ERROR_OPEN_FILES: error = EBUSY; break;
92 case ERROR_OPERATION_ABORTED: error = EINTR; break;
93 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
94 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
95 case ERROR_PATH_BUSY: error = EBUSY; break;
96 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
97 case ERROR_PIPE_BUSY: error = EBUSY; break;
98 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
99 case ERROR_PIPE_LISTENING: error = EPIPE; break;
100 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
101 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
102 case ERROR_READ_FAULT: error = EIO; break;
103 case ERROR_SEEK: error = EIO; break;
104 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
105 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
106 case ERROR_SHARING_VIOLATION: error = EACCES; break;
107 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
108 case ERROR_SWAPERROR: error = ENOENT; break;
109 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
110 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
111 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
112 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
113 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
114 case ERROR_WRITE_FAULT: error = EIO; break;
115 case ERROR_WRITE_PROTECT: error = EROFS; break;
116 }
117 return error;
118}
119
3e4a1ba0
JS
120#undef open
121int mingw_open (const char *filename, int oflags, ...)
122{
123 va_list args;
124 unsigned mode;
125 va_start(args, oflags);
126 mode = va_arg(args, int);
127 va_end(args);
128
129 if (!strcmp(filename, "/dev/null"))
130 filename = "nul";
131 int fd = open(filename, oflags, mode);
132 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
133 DWORD attrs = GetFileAttributes(filename);
134 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
135 errno = EISDIR;
136 }
137 return fd;
138}
139
5411bdc4
MSO
140static inline time_t filetime_to_time_t(const FILETIME *ft)
141{
142 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
143 winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
144 winTime /= 10000000; /* Nano to seconds resolution */
145 return (time_t)winTime;
146}
147
5411bdc4
MSO
148/* We keep the do_lstat code in a separate function to avoid recursion.
149 * When a path ends with a slash, the stat will fail with ENOENT. In
150 * this case, we strip the trailing slashes and stat again.
151 */
152static int do_lstat(const char *file_name, struct stat *buf)
153{
154 WIN32_FILE_ATTRIBUTE_DATA fdata;
155
444dc903 156 if (!(errno = get_file_attr(file_name, &fdata))) {
5411bdc4
MSO
157 buf->st_ino = 0;
158 buf->st_gid = 0;
159 buf->st_uid = 0;
180964f0 160 buf->st_nlink = 1;
444dc903 161 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
1d4e4cd4
JS
162 buf->st_size = fdata.nFileSizeLow |
163 (((off_t)fdata.nFileSizeHigh)<<32);
8252df62 164 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
5411bdc4
MSO
165 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
166 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
167 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
5411bdc4
MSO
168 return 0;
169 }
5411bdc4
MSO
170 return -1;
171}
172
173/* We provide our own lstat/fstat functions, since the provided
174 * lstat/fstat functions are so slow. These stat functions are
175 * tailored for Git's usage (read: fast), and are not meant to be
176 * complete. Note that Git stat()s are redirected to mingw_lstat()
177 * too, since Windows doesn't really handle symlinks that well.
178 */
180964f0 179int mingw_lstat(const char *file_name, struct stat *buf)
5411bdc4
MSO
180{
181 int namelen;
182 static char alt_name[PATH_MAX];
183
184 if (!do_lstat(file_name, buf))
185 return 0;
186
187 /* if file_name ended in a '/', Windows returned ENOENT;
188 * try again without trailing slashes
189 */
190 if (errno != ENOENT)
191 return -1;
192
193 namelen = strlen(file_name);
194 if (namelen && file_name[namelen-1] != '/')
195 return -1;
196 while (namelen && file_name[namelen-1] == '/')
197 --namelen;
198 if (!namelen || namelen >= PATH_MAX)
199 return -1;
200
201 memcpy(alt_name, file_name, namelen);
202 alt_name[namelen] = 0;
203 return do_lstat(alt_name, buf);
204}
205
206#undef fstat
180964f0 207int mingw_fstat(int fd, struct stat *buf)
5411bdc4
MSO
208{
209 HANDLE fh = (HANDLE)_get_osfhandle(fd);
210 BY_HANDLE_FILE_INFORMATION fdata;
211
212 if (fh == INVALID_HANDLE_VALUE) {
213 errno = EBADF;
214 return -1;
215 }
216 /* direct non-file handles to MS's fstat() */
180964f0 217 if (GetFileType(fh) != FILE_TYPE_DISK)
1d4e4cd4 218 return _fstati64(fd, buf);
5411bdc4
MSO
219
220 if (GetFileInformationByHandle(fh, &fdata)) {
5411bdc4
MSO
221 buf->st_ino = 0;
222 buf->st_gid = 0;
223 buf->st_uid = 0;
180964f0 224 buf->st_nlink = 1;
444dc903 225 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
1d4e4cd4
JS
226 buf->st_size = fdata.nFileSizeLow |
227 (((off_t)fdata.nFileSizeHigh)<<32);
8252df62 228 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
5411bdc4
MSO
229 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
230 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
231 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
232 return 0;
233 }
234 errno = EBADF;
235 return -1;
236}
237
7c0ffa1c
JS
238static inline void time_t_to_filetime(time_t t, FILETIME *ft)
239{
240 long long winTime = t * 10000000LL + 116444736000000000LL;
241 ft->dwLowDateTime = winTime;
242 ft->dwHighDateTime = winTime >> 32;
243}
244
245int mingw_utime (const char *file_name, const struct utimbuf *times)
246{
247 FILETIME mft, aft;
248 int fh, rc;
249
250 /* must have write permission */
251 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
252 return -1;
253
254 time_t_to_filetime(times->modtime, &mft);
255 time_t_to_filetime(times->actime, &aft);
256 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
257 errno = EINVAL;
258 rc = -1;
259 } else
260 rc = 0;
261 close(fh);
262 return rc;
263}
264
f4626df5
JS
265unsigned int sleep (unsigned int seconds)
266{
267 Sleep(seconds*1000);
268 return 0;
269}
270
271int mkstemp(char *template)
272{
273 char *filename = mktemp(template);
274 if (filename == NULL)
275 return -1;
276 return open(filename, O_RDWR | O_CREAT, 0600);
277}
278
279int gettimeofday(struct timeval *tv, void *tz)
280{
a42a0c2e
JS
281 SYSTEMTIME st;
282 struct tm tm;
283 GetSystemTime(&st);
284 tm.tm_year = st.wYear-1900;
285 tm.tm_mon = st.wMonth-1;
286 tm.tm_mday = st.wDay;
287 tm.tm_hour = st.wHour;
288 tm.tm_min = st.wMinute;
289 tm.tm_sec = st.wSecond;
290 tv->tv_sec = tm_to_time_t(&tm);
291 if (tv->tv_sec < 0)
292 return -1;
293 tv->tv_usec = st.wMilliseconds*1000;
294 return 0;
f4626df5
JS
295}
296
897bb8cb
JS
297int pipe(int filedes[2])
298{
299 int fd;
300 HANDLE h[2], parent;
301
302 if (_pipe(filedes, 8192, 0) < 0)
303 return -1;
304
305 parent = GetCurrentProcess();
306
307 if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
308 parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
309 close(filedes[0]);
310 close(filedes[1]);
311 return -1;
312 }
313 if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
314 parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
315 close(filedes[0]);
316 close(filedes[1]);
317 CloseHandle(h[0]);
318 return -1;
319 }
320 fd = _open_osfhandle((int)h[0], O_NOINHERIT);
321 if (fd < 0) {
322 close(filedes[0]);
323 close(filedes[1]);
324 CloseHandle(h[0]);
325 CloseHandle(h[1]);
326 return -1;
327 }
328 close(filedes[0]);
329 filedes[0] = fd;
330 fd = _open_osfhandle((int)h[1], O_NOINHERIT);
331 if (fd < 0) {
332 close(filedes[0]);
333 close(filedes[1]);
334 CloseHandle(h[1]);
335 return -1;
336 }
337 close(filedes[1]);
338 filedes[1] = fd;
339 return 0;
340}
341
f4626df5
JS
342int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
343{
6ed807f8
JS
344 int i, pending;
345
d317851a
JS
346 if (timeout >= 0) {
347 if (nfds == 0) {
348 Sleep(timeout);
349 return 0;
350 }
6ed807f8 351 return errno = EINVAL, error("poll timeout not supported");
d317851a 352 }
6ed807f8
JS
353
354 /* When there is only one fd to wait for, then we pretend that
355 * input is available and let the actual wait happen when the
356 * caller invokes read().
357 */
358 if (nfds == 1) {
359 if (!(ufds[0].events & POLLIN))
360 return errno = EINVAL, error("POLLIN not set");
361 ufds[0].revents = POLLIN;
362 return 0;
363 }
364
365repeat:
366 pending = 0;
367 for (i = 0; i < nfds; i++) {
368 DWORD avail = 0;
369 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
370 if (h == INVALID_HANDLE_VALUE)
371 return -1; /* errno was set */
372
373 if (!(ufds[i].events & POLLIN))
374 return errno = EINVAL, error("POLLIN not set");
375
376 /* this emulation works only for pipes */
377 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
378 int err = GetLastError();
379 if (err == ERROR_BROKEN_PIPE) {
380 ufds[i].revents = POLLHUP;
381 pending++;
382 } else {
383 errno = EINVAL;
384 return error("PeekNamedPipe failed,"
385 " GetLastError: %u", err);
386 }
387 } else if (avail) {
388 ufds[i].revents = POLLIN;
389 pending++;
390 } else
391 ufds[i].revents = 0;
392 }
393 if (!pending) {
394 /* The only times that we spin here is when the process
395 * that is connected through the pipes is waiting for
396 * its own input data to become available. But since
397 * the process (pack-objects) is itself CPU intensive,
398 * it will happily pick up the time slice that we are
399 * relinguishing here.
400 */
401 Sleep(0);
402 goto repeat;
403 }
404 return 0;
f4626df5
JS
405}
406
407struct tm *gmtime_r(const time_t *timep, struct tm *result)
408{
409 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
410 memcpy(result, gmtime(timep), sizeof(struct tm));
411 return result;
412}
413
414struct tm *localtime_r(const time_t *timep, struct tm *result)
415{
416 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
417 memcpy(result, localtime(timep), sizeof(struct tm));
418 return result;
419}
420
25fe217b
JS
421#undef getcwd
422char *mingw_getcwd(char *pointer, int len)
423{
424 int i;
425 char *ret = getcwd(pointer, len);
426 if (!ret)
427 return ret;
428 for (i = 0; pointer[i]; i++)
429 if (pointer[i] == '\\')
430 pointer[i] = '/';
431 return ret;
432}
433
6fd6aec4
JS
434#undef getenv
435char *mingw_getenv(const char *name)
436{
437 char *result = getenv(name);
438 if (!result && !strcmp(name, "TMPDIR")) {
439 /* on Windows it is TMP and TEMP */
440 result = getenv("TMP");
441 if (!result)
442 result = getenv("TEMP");
443 }
444 return result;
445}
446
7e5d7768
JS
447/*
448 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
449 * (Parsing C++ Command-Line Arguments)
450 */
451static const char *quote_arg(const char *arg)
452{
453 /* count chars to quote */
454 int len = 0, n = 0;
455 int force_quotes = 0;
456 char *q, *d;
457 const char *p = arg;
458 if (!*p) force_quotes = 1;
459 while (*p) {
3aea1a5a 460 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
7e5d7768
JS
461 force_quotes = 1;
462 else if (*p == '"')
463 n++;
464 else if (*p == '\\') {
465 int count = 0;
466 while (*p == '\\') {
467 count++;
468 p++;
469 len++;
470 }
471 if (*p == '"')
472 n += count*2 + 1;
473 continue;
474 }
475 len++;
476 p++;
477 }
478 if (!force_quotes && n == 0)
479 return arg;
480
481 /* insert \ where necessary */
482 d = q = xmalloc(len+n+3);
483 *d++ = '"';
484 while (*arg) {
485 if (*arg == '"')
486 *d++ = '\\';
487 else if (*arg == '\\') {
488 int count = 0;
489 while (*arg == '\\') {
490 count++;
491 *d++ = *arg++;
492 }
493 if (*arg == '"') {
494 while (count-- > 0)
495 *d++ = '\\';
496 *d++ = '\\';
497 }
498 }
499 *d++ = *arg++;
500 }
501 *d++ = '"';
502 *d++ = 0;
503 return q;
504}
505
f1a4dfb8
JS
506static const char *parse_interpreter(const char *cmd)
507{
508 static char buf[100];
509 char *p, *opt;
510 int n, fd;
511
512 /* don't even try a .exe */
513 n = strlen(cmd);
514 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
515 return NULL;
516
517 fd = open(cmd, O_RDONLY);
518 if (fd < 0)
519 return NULL;
520 n = read(fd, buf, sizeof(buf)-1);
521 close(fd);
522 if (n < 4) /* at least '#!/x' and not error */
523 return NULL;
524
525 if (buf[0] != '#' || buf[1] != '!')
526 return NULL;
527 buf[n] = '\0';
528 p = strchr(buf, '\n');
529 if (!p)
530 return NULL;
531
532 *p = '\0';
533 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
534 return NULL;
535 /* strip options */
536 if ((opt = strchr(p+1, ' ')))
537 *opt = '\0';
538 return p+1;
539}
540
541/*
542 * Splits the PATH into parts.
543 */
544static char **get_path_split(void)
545{
546 char *p, **path, *envpath = getenv("PATH");
547 int i, n = 0;
548
549 if (!envpath || !*envpath)
550 return NULL;
551
552 envpath = xstrdup(envpath);
553 p = envpath;
554 while (p) {
555 char *dir = p;
556 p = strchr(p, ';');
557 if (p) *p++ = '\0';
558 if (*dir) { /* not earlier, catches series of ; */
559 ++n;
560 }
561 }
562 if (!n)
563 return NULL;
564
565 path = xmalloc((n+1)*sizeof(char*));
566 p = envpath;
567 i = 0;
568 do {
569 if (*p)
570 path[i++] = xstrdup(p);
571 p = p+strlen(p)+1;
572 } while (i < n);
573 path[i] = NULL;
574
575 free(envpath);
576
577 return path;
578}
579
580static void free_path_split(char **path)
581{
582 if (!path)
583 return;
584
585 char **p = path;
586 while (*p)
587 free(*p++);
588 free(path);
589}
590
591/*
592 * exe_only means that we only want to detect .exe files, but not scripts
593 * (which do not have an extension)
594 */
595static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
596{
597 char path[MAX_PATH];
598 snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
599
600 if (!isexe && access(path, F_OK) == 0)
601 return xstrdup(path);
602 path[strlen(path)-4] = '\0';
603 if ((!exe_only || isexe) && access(path, F_OK) == 0)
fe77b695
ER
604 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
605 return xstrdup(path);
f1a4dfb8
JS
606 return NULL;
607}
608
609/*
610 * Determines the absolute path of cmd using the the split path in path.
611 * If cmd contains a slash or backslash, no lookup is performed.
612 */
613static char *path_lookup(const char *cmd, char **path, int exe_only)
614{
615 char *prog = NULL;
616 int len = strlen(cmd);
617 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
618
619 if (strchr(cmd, '/') || strchr(cmd, '\\'))
620 prog = xstrdup(cmd);
621
622 while (!prog && *path)
623 prog = lookup_prog(*path++, cmd, isexe, exe_only);
624
625 return prog;
626}
627
7e5d7768
JS
628static int env_compare(const void *a, const void *b)
629{
630 char *const *ea = a;
631 char *const *eb = b;
632 return strcasecmp(*ea, *eb);
633}
634
635static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
636 int prepend_cmd)
637{
638 STARTUPINFO si;
639 PROCESS_INFORMATION pi;
640 struct strbuf envblk, args;
641 unsigned flags;
642 BOOL ret;
643
644 /* Determine whether or not we are associated to a console */
645 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
646 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
647 FILE_ATTRIBUTE_NORMAL, NULL);
648 if (cons == INVALID_HANDLE_VALUE) {
649 /* There is no console associated with this process.
650 * Since the child is a console process, Windows
651 * would normally create a console window. But
652 * since we'll be redirecting std streams, we do
653 * not need the console.
19fb896f
AG
654 * It is necessary to use DETACHED_PROCESS
655 * instead of CREATE_NO_WINDOW to make ssh
656 * recognize that it has no console.
7e5d7768 657 */
19fb896f 658 flags = DETACHED_PROCESS;
7e5d7768
JS
659 } else {
660 /* There is already a console. If we specified
19fb896f 661 * DETACHED_PROCESS here, too, Windows would
7e5d7768 662 * disassociate the child from the console.
19fb896f 663 * The same is true for CREATE_NO_WINDOW.
7e5d7768
JS
664 * Go figure!
665 */
666 flags = 0;
667 CloseHandle(cons);
668 }
669 memset(&si, 0, sizeof(si));
670 si.cb = sizeof(si);
671 si.dwFlags = STARTF_USESTDHANDLES;
672 si.hStdInput = (HANDLE) _get_osfhandle(0);
673 si.hStdOutput = (HANDLE) _get_osfhandle(1);
674 si.hStdError = (HANDLE) _get_osfhandle(2);
675
676 /* concatenate argv, quoting args as we go */
677 strbuf_init(&args, 0);
678 if (prepend_cmd) {
679 char *quoted = (char *)quote_arg(cmd);
680 strbuf_addstr(&args, quoted);
681 if (quoted != cmd)
682 free(quoted);
683 }
684 for (; *argv; argv++) {
685 char *quoted = (char *)quote_arg(*argv);
686 if (*args.buf)
687 strbuf_addch(&args, ' ');
688 strbuf_addstr(&args, quoted);
689 if (quoted != *argv)
690 free(quoted);
691 }
692
693 if (env) {
694 int count = 0;
695 char **e, **sorted_env;
696
697 for (e = env; *e; e++)
698 count++;
699
700 /* environment must be sorted */
701 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
702 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
703 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
704
705 strbuf_init(&envblk, 0);
706 for (e = sorted_env; *e; e++) {
707 strbuf_addstr(&envblk, *e);
708 strbuf_addch(&envblk, '\0');
709 }
710 free(sorted_env);
711 }
712
713 memset(&pi, 0, sizeof(pi));
714 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
715 env ? envblk.buf : NULL, NULL, &si, &pi);
716
717 if (env)
718 strbuf_release(&envblk);
719 strbuf_release(&args);
720
721 if (!ret) {
722 errno = ENOENT;
723 return -1;
724 }
725 CloseHandle(pi.hThread);
726 return (pid_t)pi.hProcess;
727}
728
729pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
730{
731 pid_t pid;
732 char **path = get_path_split();
733 char *prog = path_lookup(cmd, path, 0);
734
735 if (!prog) {
736 errno = ENOENT;
737 pid = -1;
738 }
739 else {
740 const char *interpr = parse_interpreter(prog);
741
742 if (interpr) {
743 const char *argv0 = argv[0];
744 char *iprog = path_lookup(interpr, path, 1);
745 argv[0] = prog;
746 if (!iprog) {
747 errno = ENOENT;
748 pid = -1;
749 }
750 else {
751 pid = mingw_spawnve(iprog, argv, env, 1);
752 free(iprog);
753 }
754 argv[0] = argv0;
755 }
756 else
757 pid = mingw_spawnve(prog, argv, env, 0);
758 free(prog);
759 }
760 free_path_split(path);
761 return pid;
762}
763
f1a4dfb8
JS
764static int try_shell_exec(const char *cmd, char *const *argv, char **env)
765{
766 const char *interpr = parse_interpreter(cmd);
767 char **path;
768 char *prog;
769 int pid = 0;
770
771 if (!interpr)
772 return 0;
773 path = get_path_split();
774 prog = path_lookup(interpr, path, 1);
775 if (prog) {
776 int argc = 0;
777 const char **argv2;
778 while (argv[argc]) argc++;
7e5d7768
JS
779 argv2 = xmalloc(sizeof(*argv) * (argc+1));
780 argv2[0] = (char *)cmd; /* full path to the script file */
781 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
782 pid = mingw_spawnve(prog, argv2, env, 1);
f1a4dfb8
JS
783 if (pid >= 0) {
784 int status;
785 if (waitpid(pid, &status, 0) < 0)
786 status = 255;
787 exit(status);
788 }
789 pid = 1; /* indicate that we tried but failed */
790 free(prog);
791 free(argv2);
792 }
793 free_path_split(path);
794 return pid;
795}
796
797static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
798{
799 /* check if git_command is a shell script */
800 if (!try_shell_exec(cmd, argv, (char **)env)) {
801 int pid, status;
802
7e5d7768 803 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
f1a4dfb8
JS
804 if (pid < 0)
805 return;
806 if (waitpid(pid, &status, 0) < 0)
807 status = 255;
808 exit(status);
809 }
810}
811
812void mingw_execvp(const char *cmd, char *const *argv)
813{
814 char **path = get_path_split();
815 char *prog = path_lookup(cmd, path, 0);
816
817 if (prog) {
818 mingw_execve(prog, argv, environ);
819 free(prog);
820 } else
821 errno = ENOENT;
822
823 free_path_split(path);
824}
825
ba26f296
JS
826char **copy_environ()
827{
828 char **env;
829 int i = 0;
830 while (environ[i])
831 i++;
832 env = xmalloc((i+1)*sizeof(*env));
833 for (i = 0; environ[i]; i++)
834 env[i] = xstrdup(environ[i]);
835 env[i] = NULL;
836 return env;
837}
838
839void free_environ(char **env)
840{
841 int i;
842 for (i = 0; env[i]; i++)
843 free(env[i]);
844 free(env);
845}
846
847static int lookup_env(char **env, const char *name, size_t nmln)
848{
849 int i;
850
851 for (i = 0; env[i]; i++) {
852 if (0 == strncmp(env[i], name, nmln)
853 && '=' == env[i][nmln])
854 /* matches */
855 return i;
856 }
857 return -1;
858}
859
860/*
861 * If name contains '=', then sets the variable, otherwise it unsets it
862 */
863char **env_setenv(char **env, const char *name)
864{
865 char *eq = strchrnul(name, '=');
866 int i = lookup_env(env, name, eq-name);
867
868 if (i < 0) {
869 if (*eq) {
870 for (i = 0; env[i]; i++)
871 ;
872 env = xrealloc(env, (i+2)*sizeof(*env));
873 env[i] = xstrdup(name);
874 env[i+1] = NULL;
875 }
876 }
877 else {
878 free(env[i]);
879 if (*eq)
880 env[i] = xstrdup(name);
881 else
882 for (; env[i]; i++)
883 env[i] = env[i+1];
884 }
885 return env;
886}
887
746fb857
JS
888/* this is the first function to call into WS_32; initialize it */
889#undef gethostbyname
890struct hostent *mingw_gethostbyname(const char *host)
891{
892 WSADATA wsa;
893
894 if (WSAStartup(MAKEWORD(2,2), &wsa))
895 die("unable to initialize winsock subsystem, error %d",
896 WSAGetLastError());
897 atexit((void(*)(void)) WSACleanup);
898 return gethostbyname(host);
899}
900
901int mingw_socket(int domain, int type, int protocol)
902{
903 int sockfd;
904 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
905 if (s == INVALID_SOCKET) {
906 /*
907 * WSAGetLastError() values are regular BSD error codes
908 * biased by WSABASEERR.
909 * However, strerror() does not know about networking
910 * specific errors, which are values beginning at 38 or so.
911 * Therefore, we choose to leave the biased error code
912 * in errno so that _if_ someone looks up the code somewhere,
913 * then it is at least the number that are usually listed.
914 */
915 errno = WSAGetLastError();
916 return -1;
917 }
918 /* convert into a file descriptor */
919 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
920 closesocket(s);
921 return error("unable to make a socket file descriptor: %s",
922 strerror(errno));
923 }
924 return sockfd;
925}
926
927#undef connect
928int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
929{
930 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
931 return connect(s, sa, sz);
932}
933
ea9e98c3
JS
934#undef rename
935int mingw_rename(const char *pold, const char *pnew)
936{
6ac6f878
JS
937 DWORD attrs, gle;
938 int tries = 0;
939 static const int delay[] = { 0, 1, 10, 20, 40 };
632f7017 940
ea9e98c3
JS
941 /*
942 * Try native rename() first to get errno right.
943 * It is based on MoveFile(), which cannot overwrite existing files.
944 */
945 if (!rename(pold, pnew))
946 return 0;
947 if (errno != EEXIST)
948 return -1;
6ac6f878 949repeat:
ea9e98c3
JS
950 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
951 return 0;
952 /* TODO: translate more errors */
6ac6f878
JS
953 gle = GetLastError();
954 if (gle == ERROR_ACCESS_DENIED &&
632f7017
JS
955 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
956 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
ea9e98c3
JS
957 errno = EISDIR;
958 return -1;
959 }
632f7017
JS
960 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
961 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
962 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
963 return 0;
6ac6f878 964 gle = GetLastError();
632f7017
JS
965 /* revert file attributes on failure */
966 SetFileAttributes(pnew, attrs);
967 }
ea9e98c3 968 }
6ac6f878
JS
969 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
970 /*
971 * We assume that some other process had the source or
972 * destination file open at the wrong moment and retry.
973 * In order to give the other process a higher chance to
974 * complete its operation, we give up our time slice now.
975 * If we have to retry again, we do sleep a bit.
976 */
977 Sleep(delay[tries]);
978 tries++;
979 goto repeat;
980 }
ea9e98c3
JS
981 errno = EACCES;
982 return -1;
983}
984
f4626df5
JS
985struct passwd *getpwuid(int uid)
986{
f7597aca 987 static char user_name[100];
f4626df5 988 static struct passwd p;
f7597aca
JS
989
990 DWORD len = sizeof(user_name);
991 if (!GetUserName(user_name, &len))
992 return NULL;
993 p.pw_name = user_name;
994 p.pw_gecos = "unknown";
995 p.pw_dir = NULL;
f4626df5
JS
996 return &p;
997}
998
6072fc31
JS
999static HANDLE timer_event;
1000static HANDLE timer_thread;
1001static int timer_interval;
1002static int one_shot;
1003static sig_handler_t timer_fn = SIG_DFL;
1004
1005/* The timer works like this:
1006 * The thread, ticktack(), is a trivial routine that most of the time
1007 * only waits to receive the signal to terminate. The main thread tells
1008 * the thread to terminate by setting the timer_event to the signalled
1009 * state.
1010 * But ticktack() interrupts the wait state after the timer's interval
1011 * length to call the signal handler.
1012 */
1013
1014static __stdcall unsigned ticktack(void *dummy)
1015{
1016 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1017 if (timer_fn == SIG_DFL)
1018 die("Alarm");
1019 if (timer_fn != SIG_IGN)
1020 timer_fn(SIGALRM);
1021 if (one_shot)
1022 break;
1023 }
1024 return 0;
1025}
1026
1027static int start_timer_thread(void)
1028{
1029 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1030 if (timer_event) {
1031 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1032 if (!timer_thread )
1033 return errno = ENOMEM,
1034 error("cannot start timer thread");
1035 } else
1036 return errno = ENOMEM,
1037 error("cannot allocate resources for timer");
1038 return 0;
1039}
1040
1041static void stop_timer_thread(void)
1042{
1043 if (timer_event)
1044 SetEvent(timer_event); /* tell thread to terminate */
1045 if (timer_thread) {
1046 int rc = WaitForSingleObject(timer_thread, 1000);
1047 if (rc == WAIT_TIMEOUT)
1048 error("timer thread did not terminate timely");
1049 else if (rc != WAIT_OBJECT_0)
1050 error("waiting for timer thread failed: %lu",
1051 GetLastError());
1052 CloseHandle(timer_thread);
1053 }
1054 if (timer_event)
1055 CloseHandle(timer_event);
1056 timer_event = NULL;
1057 timer_thread = NULL;
1058}
1059
1060static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1061{
1062 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1063}
1064
f4626df5
JS
1065int setitimer(int type, struct itimerval *in, struct itimerval *out)
1066{
6072fc31
JS
1067 static const struct timeval zero;
1068 static int atexit_done;
1069
1070 if (out != NULL)
1071 return errno = EINVAL,
1072 error("setitimer param 3 != NULL not implemented");
1073 if (!is_timeval_eq(&in->it_interval, &zero) &&
1074 !is_timeval_eq(&in->it_interval, &in->it_value))
1075 return errno = EINVAL,
1076 error("setitimer: it_interval must be zero or eq it_value");
1077
1078 if (timer_thread)
1079 stop_timer_thread();
1080
1081 if (is_timeval_eq(&in->it_value, &zero) &&
1082 is_timeval_eq(&in->it_interval, &zero))
1083 return 0;
1084
1085 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1086 one_shot = is_timeval_eq(&in->it_interval, &zero);
1087 if (!atexit_done) {
1088 atexit(stop_timer_thread);
1089 atexit_done = 1;
1090 }
1091 return start_timer_thread();
f4626df5
JS
1092}
1093
1094int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1095{
6072fc31
JS
1096 if (sig != SIGALRM)
1097 return errno = EINVAL,
1098 error("sigaction only implemented for SIGALRM");
1099 if (out != NULL)
1100 return errno = EINVAL,
1101 error("sigaction: param 3 != NULL not implemented");
1102
1103 timer_fn = in->sa_handler;
1104 return 0;
1105}
1106
1107#undef signal
1108sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1109{
1110 if (sig != SIGALRM)
1111 return signal(sig, handler);
1112 sig_handler_t old = timer_fn;
1113 timer_fn = handler;
1114 return old;
f4626df5 1115}
4804aabc
SP
1116
1117static const char *make_backslash_path(const char *path)
1118{
1119 static char buf[PATH_MAX + 1];
1120 char *c;
1121
1122 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1123 die("Too long path: %.*s", 60, path);
1124
1125 for (c = buf; *c; c++) {
1126 if (*c == '/')
1127 *c = '\\';
1128 }
1129 return buf;
1130}
1131
1132void mingw_open_html(const char *unixpath)
1133{
1134 const char *htmlpath = make_backslash_path(unixpath);
1135 printf("Launching default browser to display HTML ...\n");
1136 ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1137}
7be401e0
PK
1138
1139int link(const char *oldpath, const char *newpath)
1140{
1141 typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1142 static T create_hard_link = NULL;
1143 if (!create_hard_link) {
1144 create_hard_link = (T) GetProcAddress(
1145 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1146 if (!create_hard_link)
1147 create_hard_link = (T)-1;
1148 }
1149 if (create_hard_link == (T)-1) {
1150 errno = ENOSYS;
1151 return -1;
1152 }
1153 if (!create_hard_link(newpath, oldpath, NULL)) {
1154 errno = err_win_to_posix(GetLastError());
1155 return -1;
1156 }
1157 return 0;
1158}