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mingw: Don't ask the user yes/no questions if they can't see the question.
[git/dscho.git] / compat / mingw.c
blob3b8107372f81e5e1cfc865c76aceeb1b6ce562f4
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 #undef rmdir
237 int mingw_rmdir(const char *pathname)
238 {
239 int ret, tries = 0;
240
241 while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
242 if (errno != EACCES)
243 break;
244 /*
245 * We assume that some other process had the source or
246 * destination file open at the wrong moment and retry.
247 * In order to give the other process a higher chance to
248 * complete its operation, we give up our time slice now.
249 * If we have to retry again, we do sleep a bit.
250 */
251 Sleep(delay[tries]);
252 tries++;
253 }
254 while (ret == -1 && errno == EACCES &&
255 ask_user_yes_no("Deletion of directory '%s' failed. "
256 "Should I try again?", pathname))
257 ret = rmdir(pathname);
258 return ret;
259 }
260
261 #undef open
262 int mingw_open (const char *filename, int oflags, ...)
263 {
264 va_list args;
265 unsigned mode;
266 int fd;
267
268 va_start(args, oflags);
269 mode = va_arg(args, int);
270 va_end(args);
271
272 if (!strcmp(filename, "/dev/null"))
273 filename = "nul";
274
275 fd = open(filename, oflags, mode);
276
277 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
278 DWORD attrs = GetFileAttributes(filename);
279 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
280 errno = EISDIR;
281 }
282 if ((oflags & O_CREAT) && fd >= 0 &&
283 hide_dotfiles == HIDE_DOTFILES_TRUE) {
284 /*
285 * In Windows a file or dir starting with a dot is not
286 * automatically hidden. So lets mark it as hidden when
287 * such a file is created.
288 */
289 const char *start = basename((char*)filename);
290 if (*start == '.' && make_hidden(filename))
291 warning("Could not mark '%s' as hidden.", filename);
292 }
293 return fd;
294 }
295
296 #undef write
297 ssize_t mingw_write(int fd, const void *buf, size_t count)
298 {
299 /*
300 * While write() calls to a file on a local disk are translated
301 * into WriteFile() calls with a maximum size of 64KB on Windows
302 * XP and 256KB on Vista, no such cap is placed on writes to
303 * files over the network on Windows XP. Unfortunately, there
304 * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
305 * bigger writes fail on Windows XP.
306 * So we cap to a nice 31MB here to avoid write failures over
307 * the net without changing the number of WriteFile() calls in
308 * the local case.
309 */
310 return write(fd, buf, min(count, 31 * 1024 * 1024));
311 }
312
313 #undef fopen
314 FILE *mingw_fopen (const char *filename, const char *otype)
315 {
316 int hide = 0;
317 FILE *file;
318 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
319 basename((char*)filename)[0] == '.')
320 hide = access(filename, F_OK);
321 if (!strcmp(filename, "/dev/null"))
322 filename = "nul";
323 file = fopen(filename, otype);
324 if (file && hide && make_hidden(filename))
325 warning("Could not mark '%s' as hidden.", filename);
326 return file;
327 }
328
329 #undef freopen
330 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
331 {
332 int hide = 0;
333 FILE *file;
334 if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
335 basename((char*)filename)[0] == '.')
336 hide = access(filename, F_OK);
337 if (filename && !strcmp(filename, "/dev/null"))
338 filename = "nul";
339 file = freopen(filename, otype, stream);
340 if (file && hide && make_hidden(filename))
341 warning("Could not mark '%s' as hidden.", filename);
342 return file;
343 }
344
345 /*
346 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
347 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
348 */
349 static inline long long filetime_to_hnsec(const FILETIME *ft)
350 {
351 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
352 /* Windows to Unix Epoch conversion */
353 return winTime - 116444736000000000LL;
354 }
355
356 static inline time_t filetime_to_time_t(const FILETIME *ft)
357 {
358 return (time_t)(filetime_to_hnsec(ft) / 10000000);
359 }
360
361 /* We keep the do_lstat code in a separate function to avoid recursion.
362 * When a path ends with a slash, the stat will fail with ENOENT. In
363 * this case, we strip the trailing slashes and stat again.
364 *
365 * If follow is true then act like stat() and report on the link
366 * target. Otherwise report on the link itself.
367 */
368 static int do_lstat(int follow, const char *file_name, struct stat *buf)
369 {
370 WIN32_FILE_ATTRIBUTE_DATA fdata;
371
372 if (!(errno = get_file_attr(file_name, &fdata))) {
373 buf->st_ino = 0;
374 buf->st_gid = 0;
375 buf->st_uid = 0;
376 buf->st_nlink = 1;
377 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
378 buf->st_size = fdata.nFileSizeLow |
379 (((off_t)fdata.nFileSizeHigh)<<32);
380 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
381 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
382 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
383 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
384 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
385 WIN32_FIND_DATAA findbuf;
386 HANDLE handle = FindFirstFileA(file_name, &findbuf);
387 if (handle != INVALID_HANDLE_VALUE) {
388 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
389 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
390 if (follow) {
391 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
392 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
393 } else {
394 buf->st_mode = S_IFLNK;
395 }
396 buf->st_mode |= S_IREAD;
397 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
398 buf->st_mode |= S_IWRITE;
399 }
400 FindClose(handle);
401 }
402 }
403 return 0;
404 }
405 return -1;
406 }
407
408 /* We provide our own lstat/fstat functions, since the provided
409 * lstat/fstat functions are so slow. These stat functions are
410 * tailored for Git's usage (read: fast), and are not meant to be
411 * complete. Note that Git stat()s are redirected to mingw_lstat()
412 * too, since Windows doesn't really handle symlinks that well.
413 */
414 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
415 {
416 int namelen;
417 static char alt_name[PATH_MAX];
418
419 if (!do_lstat(follow, file_name, buf))
420 return 0;
421
422 /* if file_name ended in a '/', Windows returned ENOENT;
423 * try again without trailing slashes
424 */
425 if (errno != ENOENT)
426 return -1;
427
428 namelen = strlen(file_name);
429 if (namelen && file_name[namelen-1] != '/')
430 return -1;
431 while (namelen && file_name[namelen-1] == '/')
432 --namelen;
433 if (!namelen || namelen >= PATH_MAX)
434 return -1;
435
436 memcpy(alt_name, file_name, namelen);
437 alt_name[namelen] = 0;
438 return do_lstat(follow, alt_name, buf);
439 }
440
441 int mingw_lstat(const char *file_name, struct stat *buf)
442 {
443 return do_stat_internal(0, file_name, buf);
444 }
445 int mingw_stat(const char *file_name, struct stat *buf)
446 {
447 return do_stat_internal(1, file_name, buf);
448 }
449
450 #undef fstat
451 int mingw_fstat(int fd, struct stat *buf)
452 {
453 HANDLE fh = (HANDLE)_get_osfhandle(fd);
454 BY_HANDLE_FILE_INFORMATION fdata;
455
456 if (fh == INVALID_HANDLE_VALUE) {
457 errno = EBADF;
458 return -1;
459 }
460 /* direct non-file handles to MS's fstat() */
461 if (GetFileType(fh) != FILE_TYPE_DISK)
462 return _fstati64(fd, buf);
463
464 if (GetFileInformationByHandle(fh, &fdata)) {
465 buf->st_ino = 0;
466 buf->st_gid = 0;
467 buf->st_uid = 0;
468 buf->st_nlink = 1;
469 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
470 buf->st_size = fdata.nFileSizeLow |
471 (((off_t)fdata.nFileSizeHigh)<<32);
472 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
473 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
474 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
475 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
476 return 0;
477 }
478 errno = EBADF;
479 return -1;
480 }
481
482 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
483 {
484 long long winTime = t * 10000000LL + 116444736000000000LL;
485 ft->dwLowDateTime = winTime;
486 ft->dwHighDateTime = winTime >> 32;
487 }
488
489 int mingw_utime (const char *file_name, const struct utimbuf *times)
490 {
491 FILETIME mft, aft;
492 int fh, rc;
493
494 /* must have write permission */
495 DWORD attrs = GetFileAttributes(file_name);
496 if (attrs != INVALID_FILE_ATTRIBUTES &&
497 (attrs & FILE_ATTRIBUTE_READONLY)) {
498 /* ignore errors here; open() will report them */
499 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
500 }
501
502 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
503 rc = -1;
504 goto revert_attrs;
505 }
506
507 time_t_to_filetime(times->modtime, &mft);
508 time_t_to_filetime(times->actime, &aft);
509 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
510 errno = EINVAL;
511 rc = -1;
512 } else
513 rc = 0;
514 close(fh);
515
516 revert_attrs:
517 if (attrs != INVALID_FILE_ATTRIBUTES &&
518 (attrs & FILE_ATTRIBUTE_READONLY)) {
519 /* ignore errors again */
520 SetFileAttributes(file_name, attrs);
521 }
522 return rc;
523 }
524
525 unsigned int sleep (unsigned int seconds)
526 {
527 Sleep(seconds*1000);
528 return 0;
529 }
530
531 int mkstemp(char *template)
532 {
533 char *filename = mktemp(template);
534 if (filename == NULL)
535 return -1;
536 return open(filename, O_RDWR | O_CREAT, 0600);
537 }
538
539 int gettimeofday(struct timeval *tv, void *tz)
540 {
541 FILETIME ft;
542 long long hnsec;
543
544 GetSystemTimeAsFileTime(&ft);
545 hnsec = filetime_to_hnsec(&ft);
546 tv->tv_sec = hnsec / 10000000;
547 tv->tv_usec = (hnsec % 10000000) / 10;
548 return 0;
549 }
550
551 int pipe(int filedes[2])
552 {
553 HANDLE h[2];
554
555 /* this creates non-inheritable handles */
556 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
557 errno = err_win_to_posix(GetLastError());
558 return -1;
559 }
560 filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
561 if (filedes[0] < 0) {
562 CloseHandle(h[0]);
563 CloseHandle(h[1]);
564 return -1;
565 }
566 filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
567 if (filedes[0] < 0) {
568 close(filedes[0]);
569 CloseHandle(h[1]);
570 return -1;
571 }
572 return 0;
573 }
574
575 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
576 {
577 int i, pending;
578
579 if (timeout >= 0) {
580 if (nfds == 0) {
581 Sleep(timeout);
582 return 0;
583 }
584 return errno = EINVAL, error("poll timeout not supported");
585 }
586
587 /* When there is only one fd to wait for, then we pretend that
588 * input is available and let the actual wait happen when the
589 * caller invokes read().
590 */
591 if (nfds == 1) {
592 if (!(ufds[0].events & POLLIN))
593 return errno = EINVAL, error("POLLIN not set");
594 ufds[0].revents = POLLIN;
595 return 0;
596 }
597
598 repeat:
599 pending = 0;
600 for (i = 0; i < nfds; i++) {
601 DWORD avail = 0;
602 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
603 if (h == INVALID_HANDLE_VALUE)
604 return -1; /* errno was set */
605
606 if (!(ufds[i].events & POLLIN))
607 return errno = EINVAL, error("POLLIN not set");
608
609 /* this emulation works only for pipes */
610 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
611 int err = GetLastError();
612 if (err == ERROR_BROKEN_PIPE) {
613 ufds[i].revents = POLLHUP;
614 pending++;
615 } else {
616 errno = EINVAL;
617 return error("PeekNamedPipe failed,"
618 " GetLastError: %u", err);
619 }
620 } else if (avail) {
621 ufds[i].revents = POLLIN;
622 pending++;
623 } else
624 ufds[i].revents = 0;
625 }
626 if (!pending) {
627 /* The only times that we spin here is when the process
628 * that is connected through the pipes is waiting for
629 * its own input data to become available. But since
630 * the process (pack-objects) is itself CPU intensive,
631 * it will happily pick up the time slice that we are
632 * relinquishing here.
633 */
634 Sleep(0);
635 goto repeat;
636 }
637 return 0;
638 }
639
640 struct tm *gmtime_r(const time_t *timep, struct tm *result)
641 {
642 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
643 memcpy(result, gmtime(timep), sizeof(struct tm));
644 return result;
645 }
646
647 struct tm *localtime_r(const time_t *timep, struct tm *result)
648 {
649 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
650 memcpy(result, localtime(timep), sizeof(struct tm));
651 return result;
652 }
653
654 #undef getcwd
655 char *mingw_getcwd(char *pointer, int len)
656 {
657 int i;
658 char *ret = getcwd(pointer, len);
659 if (!ret)
660 return ret;
661 for (i = 0; pointer[i]; i++)
662 if (pointer[i] == '\\')
663 pointer[i] = '/';
664 return ret;
665 }
666
667 #undef getenv
668 char *mingw_getenv(const char *name)
669 {
670 char *result = getenv(name);
671 if (!result && !strcmp(name, "TMPDIR")) {
672 /* on Windows it is TMP and TEMP */
673 result = getenv("TMP");
674 if (!result)
675 result = getenv("TEMP");
676 }
677 return result;
678 }
679
680 /*
681 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
682 * (Parsing C++ Command-Line Arguments)
683 */
684 static const char *quote_arg(const char *arg)
685 {
686 /* count chars to quote */
687 int len = 0, n = 0;
688 int force_quotes = 0;
689 char *q, *d;
690 const char *p = arg;
691 if (!*p) force_quotes = 1;
692 while (*p) {
693 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
694 force_quotes = 1;
695 else if (*p == '"')
696 n++;
697 else if (*p == '\\') {
698 int count = 0;
699 while (*p == '\\') {
700 count++;
701 p++;
702 len++;
703 }
704 if (*p == '"')
705 n += count*2 + 1;
706 continue;
707 }
708 len++;
709 p++;
710 }
711 if (!force_quotes && n == 0)
712 return arg;
713
714 /* insert \ where necessary */
715 d = q = xmalloc(len+n+3);
716 *d++ = '"';
717 while (*arg) {
718 if (*arg == '"')
719 *d++ = '\\';
720 else if (*arg == '\\') {
721 int count = 0;
722 while (*arg == '\\') {
723 count++;
724 *d++ = *arg++;
725 }
726 if (*arg == '"') {
727 while (count-- > 0)
728 *d++ = '\\';
729 *d++ = '\\';
730 }
731 }
732 *d++ = *arg++;
733 }
734 *d++ = '"';
735 *d++ = 0;
736 return q;
737 }
738
739 static const char *parse_interpreter(const char *cmd)
740 {
741 static char buf[100];
742 char *p, *opt;
743 int n, fd;
744
745 /* don't even try a .exe */
746 n = strlen(cmd);
747 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
748 return NULL;
749
750 fd = open(cmd, O_RDONLY);
751 if (fd < 0)
752 return NULL;
753 n = read(fd, buf, sizeof(buf)-1);
754 close(fd);
755 if (n < 4) /* at least '#!/x' and not error */
756 return NULL;
757
758 if (buf[0] != '#' || buf[1] != '!')
759 return NULL;
760 buf[n] = '\0';
761 p = buf + strcspn(buf, "\r\n");
762 if (!*p)
763 return NULL;
764
765 *p = '\0';
766 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
767 return NULL;
768 /* strip options */
769 if ((opt = strchr(p+1, ' ')))
770 *opt = '\0';
771 return p+1;
772 }
773
774 /*
775 * Splits the PATH into parts.
776 */
777 static char **get_path_split(void)
778 {
779 char *p, **path, *envpath = getenv("PATH");
780 int i, n = 0;
781
782 if (!envpath || !*envpath)
783 return NULL;
784
785 envpath = xstrdup(envpath);
786 p = envpath;
787 while (p) {
788 char *dir = p;
789 p = strchr(p, ';');
790 if (p) *p++ = '\0';
791 if (*dir) { /* not earlier, catches series of ; */
792 ++n;
793 }
794 }
795 if (!n)
796 return NULL;
797
798 path = xmalloc((n+1)*sizeof(char *));
799 p = envpath;
800 i = 0;
801 do {
802 if (*p)
803 path[i++] = xstrdup(p);
804 p = p+strlen(p)+1;
805 } while (i < n);
806 path[i] = NULL;
807
808 free(envpath);
809
810 return path;
811 }
812
813 static void free_path_split(char **path)
814 {
815 char **p = path;
816
817 if (!path)
818 return;
819
820 while (*p)
821 free(*p++);
822 free(path);
823 }
824
825 /*
826 * exe_only means that we only want to detect .exe files, but not scripts
827 * (which do not have an extension)
828 */
829 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
830 {
831 char path[MAX_PATH];
832 snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
833
834 if (!isexe && access(path, F_OK) == 0)
835 return xstrdup(path);
836 path[strlen(path)-4] = '\0';
837 if ((!exe_only || isexe) && access(path, F_OK) == 0)
838 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
839 return xstrdup(path);
840 return NULL;
841 }
842
843 /*
844 * Determines the absolute path of cmd using the the split path in path.
845 * If cmd contains a slash or backslash, no lookup is performed.
846 */
847 static char *path_lookup(const char *cmd, char **path, int exe_only)
848 {
849 char *prog = NULL;
850 int len = strlen(cmd);
851 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
852
853 if (strchr(cmd, '/') || strchr(cmd, '\\'))
854 prog = xstrdup(cmd);
855
856 while (!prog && *path)
857 prog = lookup_prog(*path++, cmd, isexe, exe_only);
858
859 return prog;
860 }
861
862 static int env_compare(const void *a, const void *b)
863 {
864 char *const *ea = a;
865 char *const *eb = b;
866 return strcasecmp(*ea, *eb);
867 }
868
869 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
870 const char *dir,
871 int prepend_cmd, int fhin, int fhout, int fherr)
872 {
873 STARTUPINFO si;
874 PROCESS_INFORMATION pi;
875 struct strbuf envblk, args;
876 unsigned flags;
877 BOOL ret;
878
879 /* Determine whether or not we are associated to a console */
880 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
881 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
882 FILE_ATTRIBUTE_NORMAL, NULL);
883 if (cons == INVALID_HANDLE_VALUE) {
884 /* There is no console associated with this process.
885 * Since the child is a console process, Windows
886 * would normally create a console window. But
887 * since we'll be redirecting std streams, we do
888 * not need the console.
889 * It is necessary to use DETACHED_PROCESS
890 * instead of CREATE_NO_WINDOW to make ssh
891 * recognize that it has no console.
892 */
893 flags = DETACHED_PROCESS;
894 } else {
895 /* There is already a console. If we specified
896 * DETACHED_PROCESS here, too, Windows would
897 * disassociate the child from the console.
898 * The same is true for CREATE_NO_WINDOW.
899 * Go figure!
900 */
901 flags = 0;
902 CloseHandle(cons);
903 }
904 memset(&si, 0, sizeof(si));
905 si.cb = sizeof(si);
906 si.dwFlags = STARTF_USESTDHANDLES;
907 si.hStdInput = (HANDLE) _get_osfhandle(fhin);
908 si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
909 si.hStdError = (HANDLE) _get_osfhandle(fherr);
910
911 /* concatenate argv, quoting args as we go */
912 strbuf_init(&args, 0);
913 if (prepend_cmd) {
914 char *quoted = (char *)quote_arg(cmd);
915 strbuf_addstr(&args, quoted);
916 if (quoted != cmd)
917 free(quoted);
918 }
919 for (; *argv; argv++) {
920 char *quoted = (char *)quote_arg(*argv);
921 if (*args.buf)
922 strbuf_addch(&args, ' ');
923 strbuf_addstr(&args, quoted);
924 if (quoted != *argv)
925 free(quoted);
926 }
927
928 if (env) {
929 int count = 0;
930 char **e, **sorted_env;
931
932 for (e = env; *e; e++)
933 count++;
934
935 /* environment must be sorted */
936 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
937 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
938 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
939
940 strbuf_init(&envblk, 0);
941 for (e = sorted_env; *e; e++) {
942 strbuf_addstr(&envblk, *e);
943 strbuf_addch(&envblk, '\0');
944 }
945 free(sorted_env);
946 }
947
948 memset(&pi, 0, sizeof(pi));
949 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
950 env ? envblk.buf : NULL, dir, &si, &pi);
951
952 if (env)
953 strbuf_release(&envblk);
954 strbuf_release(&args);
955
956 if (!ret) {
957 errno = ENOENT;
958 return -1;
959 }
960 CloseHandle(pi.hThread);
961 return (pid_t)pi.hProcess;
962 }
963
964 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
965 int prepend_cmd)
966 {
967 return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
968 }
969
970 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
971 const char *dir,
972 int fhin, int fhout, int fherr)
973 {
974 pid_t pid;
975 char **path = get_path_split();
976 char *prog = path_lookup(cmd, path, 0);
977
978 if (!prog) {
979 errno = ENOENT;
980 pid = -1;
981 }
982 else {
983 const char *interpr = parse_interpreter(prog);
984
985 if (interpr) {
986 const char *argv0 = argv[0];
987 char *iprog = path_lookup(interpr, path, 1);
988 argv[0] = prog;
989 if (!iprog) {
990 errno = ENOENT;
991 pid = -1;
992 }
993 else {
994 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
995 fhin, fhout, fherr);
996 free(iprog);
997 }
998 argv[0] = argv0;
999 }
1000 else
1001 pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1002 fhin, fhout, fherr);
1003 free(prog);
1004 }
1005 free_path_split(path);
1006 return pid;
1007 }
1008
1009 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1010 {
1011 const char *interpr = parse_interpreter(cmd);
1012 char **path;
1013 char *prog;
1014 int pid = 0;
1015
1016 if (!interpr)
1017 return 0;
1018 path = get_path_split();
1019 prog = path_lookup(interpr, path, 1);
1020 if (prog) {
1021 int argc = 0;
1022 const char **argv2;
1023 while (argv[argc]) argc++;
1024 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1025 argv2[0] = (char *)cmd; /* full path to the script file */
1026 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1027 pid = mingw_spawnve(prog, argv2, env, 1);
1028 if (pid >= 0) {
1029 int status;
1030 if (waitpid(pid, &status, 0) < 0)
1031 status = 255;
1032 exit(status);
1033 }
1034 pid = 1; /* indicate that we tried but failed */
1035 free(prog);
1036 free(argv2);
1037 }
1038 free_path_split(path);
1039 return pid;
1040 }
1041
1042 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1043 {
1044 /* check if git_command is a shell script */
1045 if (!try_shell_exec(cmd, argv, (char **)env)) {
1046 int pid, status;
1047
1048 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1049 if (pid < 0)
1050 return;
1051 if (waitpid(pid, &status, 0) < 0)
1052 status = 255;
1053 exit(status);
1054 }
1055 }
1056
1057 void mingw_execvp(const char *cmd, char *const *argv)
1058 {
1059 char **path = get_path_split();
1060 char *prog = path_lookup(cmd, path, 0);
1061
1062 if (prog) {
1063 mingw_execve(prog, argv, environ);
1064 free(prog);
1065 } else
1066 errno = ENOENT;
1067
1068 free_path_split(path);
1069 }
1070
1071 static char **copy_environ(void)
1072 {
1073 char **env;
1074 int i = 0;
1075 while (environ[i])
1076 i++;
1077 env = xmalloc((i+1)*sizeof(*env));
1078 for (i = 0; environ[i]; i++)
1079 env[i] = xstrdup(environ[i]);
1080 env[i] = NULL;
1081 return env;
1082 }
1083
1084 void free_environ(char **env)
1085 {
1086 int i;
1087 for (i = 0; env[i]; i++)
1088 free(env[i]);
1089 free(env);
1090 }
1091
1092 static int lookup_env(char **env, const char *name, size_t nmln)
1093 {
1094 int i;
1095
1096 for (i = 0; env[i]; i++) {
1097 if (0 == strncmp(env[i], name, nmln)
1098 && '=' == env[i][nmln])
1099 /* matches */
1100 return i;
1101 }
1102 return -1;
1103 }
1104
1105 /*
1106 * If name contains '=', then sets the variable, otherwise it unsets it
1107 */
1108 static char **env_setenv(char **env, const char *name)
1109 {
1110 char *eq = strchrnul(name, '=');
1111 int i = lookup_env(env, name, eq-name);
1112
1113 if (i < 0) {
1114 if (*eq) {
1115 for (i = 0; env[i]; i++)
1116 ;
1117 env = xrealloc(env, (i+2)*sizeof(*env));
1118 env[i] = xstrdup(name);
1119 env[i+1] = NULL;
1120 }
1121 }
1122 else {
1123 free(env[i]);
1124 if (*eq)
1125 env[i] = xstrdup(name);
1126 else
1127 for (; env[i]; i++)
1128 env[i] = env[i+1];
1129 }
1130 return env;
1131 }
1132
1133 /*
1134 * Copies global environ and adjusts variables as specified by vars.
1135 */
1136 char **make_augmented_environ(const char *const *vars)
1137 {
1138 char **env = copy_environ();
1139
1140 while (*vars)
1141 env = env_setenv(env, *vars++);
1142 return env;
1143 }
1144
1145 /*
1146 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1147 * that service contains a numerical port, or that it it is null. It
1148 * does a simple search using gethostbyname, and returns one IPv4 host
1149 * if one was found.
1150 */
1151 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1152 const struct addrinfo *hints,
1153 struct addrinfo **res)
1154 {
1155 struct hostent *h = gethostbyname(node);
1156 struct addrinfo *ai;
1157 struct sockaddr_in *sin;
1158
1159 if (!h)
1160 return WSAGetLastError();
1161
1162 ai = xmalloc(sizeof(struct addrinfo));
1163 *res = ai;
1164 ai->ai_flags = 0;
1165 ai->ai_family = AF_INET;
1166 ai->ai_socktype = hints->ai_socktype;
1167 switch (hints->ai_socktype) {
1168 case SOCK_STREAM:
1169 ai->ai_protocol = IPPROTO_TCP;
1170 break;
1171 case SOCK_DGRAM:
1172 ai->ai_protocol = IPPROTO_UDP;
1173 break;
1174 default:
1175 ai->ai_protocol = 0;
1176 break;
1177 }
1178 ai->ai_addrlen = sizeof(struct sockaddr_in);
1179 ai->ai_canonname = strdup(h->h_name);
1180
1181 sin = xmalloc(ai->ai_addrlen);
1182 memset(sin, 0, ai->ai_addrlen);
1183 sin->sin_family = AF_INET;
1184 if (service)
1185 sin->sin_port = htons(atoi(service));
1186 sin->sin_addr = *(struct in_addr *)h->h_addr;
1187 ai->ai_addr = (struct sockaddr *)sin;
1188 ai->ai_next = 0;
1189 return 0;
1190 }
1191
1192 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1193 {
1194 free(res->ai_canonname);
1195 free(res->ai_addr);
1196 free(res);
1197 }
1198
1199 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1200 char *host, DWORD hostlen,
1201 char *serv, DWORD servlen, int flags)
1202 {
1203 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1204 if (sa->sa_family != AF_INET)
1205 return EAI_FAMILY;
1206 if (!host && !serv)
1207 return EAI_NONAME;
1208
1209 if (host && hostlen > 0) {
1210 struct hostent *ent = NULL;
1211 if (!(flags & NI_NUMERICHOST))
1212 ent = gethostbyaddr((const char *)&sin->sin_addr,
1213 sizeof(sin->sin_addr), AF_INET);
1214
1215 if (ent)
1216 snprintf(host, hostlen, "%s", ent->h_name);
1217 else if (flags & NI_NAMEREQD)
1218 return EAI_NONAME;
1219 else
1220 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1221 }
1222
1223 if (serv && servlen > 0) {
1224 struct servent *ent = NULL;
1225 if (!(flags & NI_NUMERICSERV))
1226 ent = getservbyport(sin->sin_port,
1227 flags & NI_DGRAM ? "udp" : "tcp");
1228
1229 if (ent)
1230 snprintf(serv, servlen, "%s", ent->s_name);
1231 else
1232 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1233 }
1234
1235 return 0;
1236 }
1237
1238 static HMODULE ipv6_dll = NULL;
1239 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1240 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1241 const struct addrinfo *hints,
1242 struct addrinfo **res);
1243 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1244 char *host, DWORD hostlen,
1245 char *serv, DWORD servlen, int flags);
1246 /*
1247 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1248 * don't need to try to load that one dynamically.
1249 */
1250
1251 static void socket_cleanup(void)
1252 {
1253 WSACleanup();
1254 if (ipv6_dll)
1255 FreeLibrary(ipv6_dll);
1256 ipv6_dll = NULL;
1257 ipv6_freeaddrinfo = freeaddrinfo_stub;
1258 ipv6_getaddrinfo = getaddrinfo_stub;
1259 ipv6_getnameinfo = getnameinfo_stub;
1260 }
1261
1262 static void ensure_socket_initialization(void)
1263 {
1264 WSADATA wsa;
1265 static int initialized = 0;
1266 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1267 const char **name;
1268
1269 if (initialized)
1270 return;
1271
1272 if (WSAStartup(MAKEWORD(2,2), &wsa))
1273 die("unable to initialize winsock subsystem, error %d",
1274 WSAGetLastError());
1275
1276 for (name = libraries; *name; name++) {
1277 ipv6_dll = LoadLibrary(*name);
1278 if (!ipv6_dll)
1279 continue;
1280
1281 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1282 GetProcAddress(ipv6_dll, "freeaddrinfo");
1283 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1284 const struct addrinfo *,
1285 struct addrinfo **))
1286 GetProcAddress(ipv6_dll, "getaddrinfo");
1287 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1288 socklen_t, char *, DWORD,
1289 char *, DWORD, int))
1290 GetProcAddress(ipv6_dll, "getnameinfo");
1291 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1292 FreeLibrary(ipv6_dll);
1293 ipv6_dll = NULL;
1294 } else
1295 break;
1296 }
1297 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1298 ipv6_freeaddrinfo = freeaddrinfo_stub;
1299 ipv6_getaddrinfo = getaddrinfo_stub;
1300 ipv6_getnameinfo = getnameinfo_stub;
1301 }
1302
1303 atexit(socket_cleanup);
1304 initialized = 1;
1305 }
1306
1307 #undef gethostbyname
1308 struct hostent *mingw_gethostbyname(const char *host)
1309 {
1310 ensure_socket_initialization();
1311 return gethostbyname(host);
1312 }
1313
1314 void mingw_freeaddrinfo(struct addrinfo *res)
1315 {
1316 ipv6_freeaddrinfo(res);
1317 }
1318
1319 int mingw_getaddrinfo(const char *node, const char *service,
1320 const struct addrinfo *hints, struct addrinfo **res)
1321 {
1322 ensure_socket_initialization();
1323 return ipv6_getaddrinfo(node, service, hints, res);
1324 }
1325
1326 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1327 char *host, DWORD hostlen, char *serv, DWORD servlen,
1328 int flags)
1329 {
1330 ensure_socket_initialization();
1331 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1332 }
1333
1334 int mingw_socket(int domain, int type, int protocol)
1335 {
1336 int sockfd;
1337 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1338 if (s == INVALID_SOCKET) {
1339 /*
1340 * WSAGetLastError() values are regular BSD error codes
1341 * biased by WSABASEERR.
1342 * However, strerror() does not know about networking
1343 * specific errors, which are values beginning at 38 or so.
1344 * Therefore, we choose to leave the biased error code
1345 * in errno so that _if_ someone looks up the code somewhere,
1346 * then it is at least the number that are usually listed.
1347 */
1348 errno = WSAGetLastError();
1349 return -1;
1350 }
1351 /* convert into a file descriptor */
1352 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1353 closesocket(s);
1354 return error("unable to make a socket file descriptor: %s",
1355 strerror(errno));
1356 }
1357 return sockfd;
1358 }
1359
1360 #undef connect
1361 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1362 {
1363 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1364 return connect(s, sa, sz);
1365 }
1366
1367 #undef rename
1368 int mingw_rename(const char *pold, const char *pnew)
1369 {
1370 DWORD attrs, gle;
1371 int tries = 0;
1372
1373 /*
1374 * Try native rename() first to get errno right.
1375 * It is based on MoveFile(), which cannot overwrite existing files.
1376 */
1377 if (!rename(pold, pnew))
1378 return 0;
1379 if (errno != EEXIST)
1380 return -1;
1381 repeat:
1382 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1383 return 0;
1384 /* TODO: translate more errors */
1385 gle = GetLastError();
1386 if (gle == ERROR_ACCESS_DENIED &&
1387 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1388 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1389 errno = EISDIR;
1390 return -1;
1391 }
1392 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1393 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1394 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1395 return 0;
1396 gle = GetLastError();
1397 /* revert file attributes on failure */
1398 SetFileAttributes(pnew, attrs);
1399 }
1400 }
1401 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1402 /*
1403 * We assume that some other process had the source or
1404 * destination file open at the wrong moment and retry.
1405 * In order to give the other process a higher chance to
1406 * complete its operation, we give up our time slice now.
1407 * If we have to retry again, we do sleep a bit.
1408 */
1409 Sleep(delay[tries]);
1410 tries++;
1411 goto repeat;
1412 }
1413 if (gle == ERROR_ACCESS_DENIED &&
1414 ask_user_yes_no("Rename from '%s' to '%s' failed. "
1415 "Should I try again?", pold, pnew))
1416 goto repeat;
1417
1418 errno = EACCES;
1419 return -1;
1420 }
1421
1422 /*
1423 * Note that this doesn't return the actual pagesize, but
1424 * the allocation granularity. If future Windows specific git code
1425 * needs the real getpagesize function, we need to find another solution.
1426 */
1427 int mingw_getpagesize(void)
1428 {
1429 SYSTEM_INFO si;
1430 GetSystemInfo(&si);
1431 return si.dwAllocationGranularity;
1432 }
1433
1434 struct passwd *getpwuid(int uid)
1435 {
1436 static char user_name[100];
1437 static struct passwd p;
1438
1439 DWORD len = sizeof(user_name);
1440 if (!GetUserName(user_name, &len))
1441 return NULL;
1442 p.pw_name = user_name;
1443 p.pw_gecos = "unknown";
1444 p.pw_dir = NULL;
1445 return &p;
1446 }
1447
1448 static HANDLE timer_event;
1449 static HANDLE timer_thread;
1450 static int timer_interval;
1451 static int one_shot;
1452 static sig_handler_t timer_fn = SIG_DFL;
1453
1454 /* The timer works like this:
1455 * The thread, ticktack(), is a trivial routine that most of the time
1456 * only waits to receive the signal to terminate. The main thread tells
1457 * the thread to terminate by setting the timer_event to the signalled
1458 * state.
1459 * But ticktack() interrupts the wait state after the timer's interval
1460 * length to call the signal handler.
1461 */
1462
1463 static unsigned __stdcall ticktack(void *dummy)
1464 {
1465 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1466 if (timer_fn == SIG_DFL)
1467 die("Alarm");
1468 if (timer_fn != SIG_IGN)
1469 timer_fn(SIGALRM);
1470 if (one_shot)
1471 break;
1472 }
1473 return 0;
1474 }
1475
1476 static int start_timer_thread(void)
1477 {
1478 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1479 if (timer_event) {
1480 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1481 if (!timer_thread )
1482 return errno = ENOMEM,
1483 error("cannot start timer thread");
1484 } else
1485 return errno = ENOMEM,
1486 error("cannot allocate resources for timer");
1487 return 0;
1488 }
1489
1490 static void stop_timer_thread(void)
1491 {
1492 if (timer_event)
1493 SetEvent(timer_event); /* tell thread to terminate */
1494 if (timer_thread) {
1495 int rc = WaitForSingleObject(timer_thread, 1000);
1496 if (rc == WAIT_TIMEOUT)
1497 error("timer thread did not terminate timely");
1498 else if (rc != WAIT_OBJECT_0)
1499 error("waiting for timer thread failed: %lu",
1500 GetLastError());
1501 CloseHandle(timer_thread);
1502 }
1503 if (timer_event)
1504 CloseHandle(timer_event);
1505 timer_event = NULL;
1506 timer_thread = NULL;
1507 }
1508
1509 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1510 {
1511 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1512 }
1513
1514 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1515 {
1516 static const struct timeval zero;
1517 static int atexit_done;
1518
1519 if (out != NULL)
1520 return errno = EINVAL,
1521 error("setitimer param 3 != NULL not implemented");
1522 if (!is_timeval_eq(&in->it_interval, &zero) &&
1523 !is_timeval_eq(&in->it_interval, &in->it_value))
1524 return errno = EINVAL,
1525 error("setitimer: it_interval must be zero or eq it_value");
1526
1527 if (timer_thread)
1528 stop_timer_thread();
1529
1530 if (is_timeval_eq(&in->it_value, &zero) &&
1531 is_timeval_eq(&in->it_interval, &zero))
1532 return 0;
1533
1534 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1535 one_shot = is_timeval_eq(&in->it_interval, &zero);
1536 if (!atexit_done) {
1537 atexit(stop_timer_thread);
1538 atexit_done = 1;
1539 }
1540 return start_timer_thread();
1541 }
1542
1543 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1544 {
1545 if (sig != SIGALRM)
1546 return errno = EINVAL,
1547 error("sigaction only implemented for SIGALRM");
1548 if (out != NULL)
1549 return errno = EINVAL,
1550 error("sigaction: param 3 != NULL not implemented");
1551
1552 timer_fn = in->sa_handler;
1553 return 0;
1554 }
1555
1556 #undef signal
1557 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1558 {
1559 sig_handler_t old = timer_fn;
1560 if (sig != SIGALRM)
1561 return signal(sig, handler);
1562 timer_fn = handler;
1563 return old;
1564 }
1565
1566 static const char *make_backslash_path(const char *path)
1567 {
1568 static char buf[PATH_MAX + 1];
1569 char *c;
1570
1571 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1572 die("Too long path: %.*s", 60, path);
1573
1574 for (c = buf; *c; c++) {
1575 if (*c == '/')
1576 *c = '\\';
1577 }
1578 return buf;
1579 }
1580
1581 void mingw_open_html(const char *unixpath)
1582 {
1583 const char *htmlpath = make_backslash_path(unixpath);
1584 typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1585 const char *, const char *, const char *, INT);
1586 T ShellExecute;
1587 HMODULE shell32;
1588 int r;
1589
1590 shell32 = LoadLibrary("shell32.dll");
1591 if (!shell32)
1592 die("cannot load shell32.dll");
1593 ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1594 if (!ShellExecute)
1595 die("cannot run browser");
1596
1597 printf("Launching default browser to display HTML ...\n");
1598 r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1599 FreeLibrary(shell32);
1600 /* see the MSDN documentation referring to the result codes here */
1601 if (r <= 32) {
1602 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1603 }
1604 }
1605
1606 int link(const char *oldpath, const char *newpath)
1607 {
1608 typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1609 static T create_hard_link = NULL;
1610 if (!create_hard_link) {
1611 create_hard_link = (T) GetProcAddress(
1612 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1613 if (!create_hard_link)
1614 create_hard_link = (T)-1;
1615 }
1616 if (create_hard_link == (T)-1) {
1617 errno = ENOSYS;
1618 return -1;
1619 }
1620 if (!create_hard_link(newpath, oldpath, NULL)) {
1621 errno = err_win_to_posix(GetLastError());
1622 return -1;
1623 }
1624 return 0;
1625 }
1626
1627 char *getpass(const char *prompt)
1628 {
1629 struct strbuf buf = STRBUF_INIT;
1630
1631 fputs(prompt, stderr);
1632 for (;;) {
1633 char c = _getch();
1634 if (c == '\r' || c == '\n')
1635 break;
1636 strbuf_addch(&buf, c);
1637 }
1638 fputs("\n", stderr);
1639 return strbuf_detach(&buf, NULL);
1640 }
1641
1642 #ifndef NO_MINGW_REPLACE_READDIR
1643 /* MinGW readdir implementation to avoid extra lstats for Git */
1644 struct mingw_DIR
1645 {
1646 struct _finddata_t dd_dta; /* disk transfer area for this dir */
1647 struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
1648 long dd_handle; /* _findnext handle */
1649 int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1650 char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
1651 };
1652
1653 struct dirent *mingw_readdir(DIR *dir)
1654 {
1655 WIN32_FIND_DATAA buf;
1656 HANDLE handle;
1657 struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1658
1659 if (!dir->dd_handle) {
1660 errno = EBADF; /* No set_errno for mingw */
1661 return NULL;
1662 }
1663
1664 if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1665 {
1666 DWORD lasterr;
1667 handle = FindFirstFileA(dir->dd_name, &buf);
1668 lasterr = GetLastError();
1669 dir->dd_handle = (long)handle;
1670 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1671 errno = err_win_to_posix(lasterr);
1672 return NULL;
1673 }
1674 } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1675 return NULL;
1676 } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1677 DWORD lasterr = GetLastError();
1678 FindClose((HANDLE)dir->dd_handle);
1679 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1680 /* POSIX says you shouldn't set errno when readdir can't
1681 find any more files; so, if another error we leave it set. */
1682 if (lasterr != ERROR_NO_MORE_FILES)
1683 errno = err_win_to_posix(lasterr);
1684 return NULL;
1685 }
1686
1687 /* We get here if `buf' contains valid data. */
1688 strcpy(dir->dd_dir.d_name, buf.cFileName);
1689 ++dir->dd_stat;
1690
1691 /* Set file type, based on WIN32_FIND_DATA */
1692 mdir->dd_dir.d_type = 0;
1693 if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1694 mdir->dd_dir.d_type |= DT_DIR;
1695 else
1696 mdir->dd_dir.d_type |= DT_REG;
1697
1698 return (struct dirent*)&dir->dd_dir;
1699 }
1700 #endif // !NO_MINGW_REPLACE_READDIR
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