?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
packfile: close multi-pack-index in close_all_packs
[git.git] / compat / mingw.c
blob18caf21969a5917e8e6c6d754beffbba2741e6c2
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include <wchar.h>
5 #include "../strbuf.h"
6 #include "../run-command.h"
7 #include "../cache.h"
8
9 #define HCAST(type, handle) ((type)(intptr_t)handle)
10
11 static const int delay[] = { 0, 1, 10, 20, 40 };
12
13 int err_win_to_posix(DWORD winerr)
14 {
15 int error = ENOSYS;
16 switch(winerr) {
17 case ERROR_ACCESS_DENIED: error = EACCES; break;
18 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
19 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
20 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
21 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
22 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
23 case ERROR_BAD_COMMAND: error = EIO; break;
24 case ERROR_BAD_DEVICE: error = ENODEV; break;
25 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
26 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
27 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
28 case ERROR_BAD_LENGTH: error = EINVAL; break;
29 case ERROR_BAD_PATHNAME: error = ENOENT; break;
30 case ERROR_BAD_PIPE: error = EPIPE; break;
31 case ERROR_BAD_UNIT: error = ENODEV; break;
32 case ERROR_BAD_USERNAME: error = EINVAL; break;
33 case ERROR_BROKEN_PIPE: error = EPIPE; break;
34 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
35 case ERROR_BUSY: error = EBUSY; break;
36 case ERROR_BUSY_DRIVE: error = EBUSY; break;
37 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
38 case ERROR_CANNOT_MAKE: error = EACCES; break;
39 case ERROR_CANTOPEN: error = EIO; break;
40 case ERROR_CANTREAD: error = EIO; break;
41 case ERROR_CANTWRITE: error = EIO; break;
42 case ERROR_CRC: error = EIO; break;
43 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
44 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
45 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
46 case ERROR_DIRECTORY: error = EINVAL; break;
47 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
48 case ERROR_DISK_CHANGE: error = EIO; break;
49 case ERROR_DISK_FULL: error = ENOSPC; break;
50 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
51 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
52 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
53 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
54 case ERROR_FILE_EXISTS: error = EEXIST; break;
55 case ERROR_FILE_INVALID: error = ENODEV; break;
56 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
57 case ERROR_GEN_FAILURE: error = EIO; break;
58 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
59 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
60 case ERROR_INVALID_ACCESS: error = EACCES; break;
61 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
62 case ERROR_INVALID_BLOCK: error = EFAULT; break;
63 case ERROR_INVALID_DATA: error = EINVAL; break;
64 case ERROR_INVALID_DRIVE: error = ENODEV; break;
65 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
66 case ERROR_INVALID_FLAGS: error = EINVAL; break;
67 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
68 case ERROR_INVALID_HANDLE: error = EBADF; break;
69 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
70 case ERROR_INVALID_NAME: error = EINVAL; break;
71 case ERROR_INVALID_OWNER: error = EINVAL; break;
72 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
73 case ERROR_INVALID_PASSWORD: error = EPERM; break;
74 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
75 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
76 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
77 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
78 case ERROR_IO_DEVICE: error = EIO; break;
79 case ERROR_IO_INCOMPLETE: error = EINTR; break;
80 case ERROR_LOCKED: error = EBUSY; break;
81 case ERROR_LOCK_VIOLATION: error = EACCES; break;
82 case ERROR_LOGON_FAILURE: error = EACCES; break;
83 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
84 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
85 case ERROR_MORE_DATA: error = EPIPE; break;
86 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
87 case ERROR_NOACCESS: error = EFAULT; break;
88 case ERROR_NONE_MAPPED: error = EINVAL; break;
89 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
90 case ERROR_NOT_READY: error = EAGAIN; break;
91 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
92 case ERROR_NO_DATA: error = EPIPE; break;
93 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
94 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
95 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
96 case ERROR_OPEN_FAILED: error = EIO; break;
97 case ERROR_OPEN_FILES: error = EBUSY; break;
98 case ERROR_OPERATION_ABORTED: error = EINTR; break;
99 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
100 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
101 case ERROR_PATH_BUSY: error = EBUSY; break;
102 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
103 case ERROR_PIPE_BUSY: error = EBUSY; break;
104 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
105 case ERROR_PIPE_LISTENING: error = EPIPE; break;
106 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
107 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
108 case ERROR_READ_FAULT: error = EIO; break;
109 case ERROR_SEEK: error = EIO; break;
110 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
111 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
112 case ERROR_SHARING_VIOLATION: error = EACCES; break;
113 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
114 case ERROR_SWAPERROR: error = ENOENT; break;
115 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
116 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
117 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
118 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
119 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
120 case ERROR_WRITE_FAULT: error = EIO; break;
121 case ERROR_WRITE_PROTECT: error = EROFS; break;
122 }
123 return error;
124 }
125
126 static inline int is_file_in_use_error(DWORD errcode)
127 {
128 switch (errcode) {
129 case ERROR_SHARING_VIOLATION:
130 case ERROR_ACCESS_DENIED:
131 return 1;
132 }
133
134 return 0;
135 }
136
137 static int read_yes_no_answer(void)
138 {
139 char answer[1024];
140
141 if (fgets(answer, sizeof(answer), stdin)) {
142 size_t answer_len = strlen(answer);
143 int got_full_line = 0, c;
144
145 /* remove the newline */
146 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
147 answer[answer_len-2] = '\0';
148 got_full_line = 1;
149 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
150 answer[answer_len-1] = '\0';
151 got_full_line = 1;
152 }
153 /* flush the buffer in case we did not get the full line */
154 if (!got_full_line)
155 while ((c = getchar()) != EOF && c != '\n')
156 ;
157 } else
158 /* we could not read, return the
159 * default answer which is no */
160 return 0;
161
162 if (tolower(answer[0]) == 'y' && !answer[1])
163 return 1;
164 if (!strncasecmp(answer, "yes", sizeof(answer)))
165 return 1;
166 if (tolower(answer[0]) == 'n' && !answer[1])
167 return 0;
168 if (!strncasecmp(answer, "no", sizeof(answer)))
169 return 0;
170
171 /* did not find an answer we understand */
172 return -1;
173 }
174
175 static int ask_yes_no_if_possible(const char *format, ...)
176 {
177 char question[4096];
178 const char *retry_hook[] = { NULL, NULL, NULL };
179 va_list args;
180
181 va_start(args, format);
182 vsnprintf(question, sizeof(question), format, args);
183 va_end(args);
184
185 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
186 retry_hook[1] = question;
187 return !run_command_v_opt(retry_hook, 0);
188 }
189
190 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
191 return 0;
192
193 while (1) {
194 int answer;
195 fprintf(stderr, "%s (y/n) ", question);
196
197 if ((answer = read_yes_no_answer()) >= 0)
198 return answer;
199
200 fprintf(stderr, "Sorry, I did not understand your answer. "
201 "Please type 'y' or 'n'\n");
202 }
203 }
204
205 int mingw_unlink(const char *pathname)
206 {
207 int ret, tries = 0;
208 wchar_t wpathname[MAX_PATH];
209 if (xutftowcs_path(wpathname, pathname) < 0)
210 return -1;
211
212 /* read-only files cannot be removed */
213 _wchmod(wpathname, 0666);
214 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
215 if (!is_file_in_use_error(GetLastError()))
216 break;
217 /*
218 * We assume that some other process had the source or
219 * destination file open at the wrong moment and retry.
220 * In order to give the other process a higher chance to
221 * complete its operation, we give up our time slice now.
222 * If we have to retry again, we do sleep a bit.
223 */
224 Sleep(delay[tries]);
225 tries++;
226 }
227 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
228 ask_yes_no_if_possible("Unlink of file '%s' failed. "
229 "Should I try again?", pathname))
230 ret = _wunlink(wpathname);
231 return ret;
232 }
233
234 static int is_dir_empty(const wchar_t *wpath)
235 {
236 WIN32_FIND_DATAW findbuf;
237 HANDLE handle;
238 wchar_t wbuf[MAX_PATH + 2];
239 wcscpy(wbuf, wpath);
240 wcscat(wbuf, L"\\*");
241 handle = FindFirstFileW(wbuf, &findbuf);
242 if (handle == INVALID_HANDLE_VALUE)
243 return GetLastError() == ERROR_NO_MORE_FILES;
244
245 while (!wcscmp(findbuf.cFileName, L".") ||
246 !wcscmp(findbuf.cFileName, L".."))
247 if (!FindNextFileW(handle, &findbuf)) {
248 DWORD err = GetLastError();
249 FindClose(handle);
250 return err == ERROR_NO_MORE_FILES;
251 }
252 FindClose(handle);
253 return 0;
254 }
255
256 int mingw_rmdir(const char *pathname)
257 {
258 int ret, tries = 0;
259 wchar_t wpathname[MAX_PATH];
260 if (xutftowcs_path(wpathname, pathname) < 0)
261 return -1;
262
263 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
264 if (!is_file_in_use_error(GetLastError()))
265 errno = err_win_to_posix(GetLastError());
266 if (errno != EACCES)
267 break;
268 if (!is_dir_empty(wpathname)) {
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 && is_file_in_use_error(GetLastError()) &&
283 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
284 "Should I try again?", pathname))
285 ret = _wrmdir(wpathname);
286 return ret;
287 }
288
289 static inline int needs_hiding(const char *path)
290 {
291 const char *basename;
292
293 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
294 return 0;
295
296 /* We cannot use basename(), as it would remove trailing slashes */
297 mingw_skip_dos_drive_prefix((char **)&path);
298 if (!*path)
299 return 0;
300
301 for (basename = path; *path; path++)
302 if (is_dir_sep(*path)) {
303 do {
304 path++;
305 } while (is_dir_sep(*path));
306 /* ignore trailing slashes */
307 if (*path)
308 basename = path;
309 }
310
311 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
312 return *basename == '.';
313
314 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
315 return !strncasecmp(".git", basename, 4) &&
316 (!basename[4] || is_dir_sep(basename[4]));
317 }
318
319 static int set_hidden_flag(const wchar_t *path, int set)
320 {
321 DWORD original = GetFileAttributesW(path), modified;
322 if (set)
323 modified = original | FILE_ATTRIBUTE_HIDDEN;
324 else
325 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
326 if (original == modified || SetFileAttributesW(path, modified))
327 return 0;
328 errno = err_win_to_posix(GetLastError());
329 return -1;
330 }
331
332 int mingw_mkdir(const char *path, int mode)
333 {
334 int ret;
335 wchar_t wpath[MAX_PATH];
336 if (xutftowcs_path(wpath, path) < 0)
337 return -1;
338 ret = _wmkdir(wpath);
339 if (!ret && needs_hiding(path))
340 return set_hidden_flag(wpath, 1);
341 return ret;
342 }
343
344 /*
345 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
346 * is documented in [1] as opening a writable file handle in append mode.
347 * (It is believed that) this is atomic since it is maintained by the
348 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
349 *
350 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
351 *
352 * This trick does not appear to work for named pipes. Instead it creates
353 * a named pipe client handle that cannot be written to. Callers should
354 * just use the regular _wopen() for them. (And since client handle gets
355 * bound to a unique server handle, it isn't really an issue.)
356 */
357 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
358 {
359 HANDLE handle;
360 int fd;
361 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
362
363 /* only these flags are supported */
364 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
365 return errno = ENOSYS, -1;
366
367 /*
368 * FILE_SHARE_WRITE is required to permit child processes
369 * to append to the file.
370 */
371 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
372 FILE_SHARE_WRITE | FILE_SHARE_READ,
373 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
374 if (handle == INVALID_HANDLE_VALUE)
375 return errno = err_win_to_posix(GetLastError()), -1;
376
377 /*
378 * No O_APPEND here, because the CRT uses it only to reset the
379 * file pointer to EOF before each write(); but that is not
380 * necessary (and may lead to races) for a file created with
381 * FILE_APPEND_DATA.
382 */
383 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
384 if (fd < 0)
385 CloseHandle(handle);
386 return fd;
387 }
388
389 /*
390 * Does the pathname map to the local named pipe filesystem?
391 * That is, does it have a "//./pipe/" prefix?
392 */
393 static int is_local_named_pipe_path(const char *filename)
394 {
395 return (is_dir_sep(filename[0]) &&
396 is_dir_sep(filename[1]) &&
397 filename[2] == '.' &&
398 is_dir_sep(filename[3]) &&
399 !strncasecmp(filename+4, "pipe", 4) &&
400 is_dir_sep(filename[8]) &&
401 filename[9]);
402 }
403
404 int mingw_open (const char *filename, int oflags, ...)
405 {
406 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
407 va_list args;
408 unsigned mode;
409 int fd;
410 wchar_t wfilename[MAX_PATH];
411 open_fn_t open_fn;
412
413 va_start(args, oflags);
414 mode = va_arg(args, int);
415 va_end(args);
416
417 if (filename && !strcmp(filename, "/dev/null"))
418 filename = "nul";
419
420 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
421 open_fn = mingw_open_append;
422 else
423 open_fn = _wopen;
424
425 if (xutftowcs_path(wfilename, filename) < 0)
426 return -1;
427 fd = open_fn(wfilename, oflags, mode);
428
429 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
430 DWORD attrs = GetFileAttributesW(wfilename);
431 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
432 errno = EISDIR;
433 }
434 if ((oflags & O_CREAT) && needs_hiding(filename)) {
435 /*
436 * Internally, _wopen() uses the CreateFile() API which errors
437 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
438 * specified and an already existing file's attributes do not
439 * match *exactly*. As there is no mode or flag we can set that
440 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
441 * again *without* the O_CREAT flag (that corresponds to the
442 * CREATE_ALWAYS flag of CreateFile()).
443 */
444 if (fd < 0 && errno == EACCES)
445 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
446 if (fd >= 0 && set_hidden_flag(wfilename, 1))
447 warning("could not mark '%s' as hidden.", filename);
448 }
449 return fd;
450 }
451
452 static BOOL WINAPI ctrl_ignore(DWORD type)
453 {
454 return TRUE;
455 }
456
457 #undef fgetc
458 int mingw_fgetc(FILE *stream)
459 {
460 int ch;
461 if (!isatty(_fileno(stream)))
462 return fgetc(stream);
463
464 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
465 while (1) {
466 ch = fgetc(stream);
467 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
468 break;
469
470 /* Ctrl+C was pressed, simulate SIGINT and retry */
471 mingw_raise(SIGINT);
472 }
473 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
474 return ch;
475 }
476
477 #undef fopen
478 FILE *mingw_fopen (const char *filename, const char *otype)
479 {
480 int hide = needs_hiding(filename);
481 FILE *file;
482 wchar_t wfilename[MAX_PATH], wotype[4];
483 if (filename && !strcmp(filename, "/dev/null"))
484 filename = "nul";
485 if (xutftowcs_path(wfilename, filename) < 0 ||
486 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
487 return NULL;
488 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
489 error("could not unhide %s", filename);
490 return NULL;
491 }
492 file = _wfopen(wfilename, wotype);
493 if (!file && GetLastError() == ERROR_INVALID_NAME)
494 errno = ENOENT;
495 if (file && hide && set_hidden_flag(wfilename, 1))
496 warning("could not mark '%s' as hidden.", filename);
497 return file;
498 }
499
500 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
501 {
502 int hide = needs_hiding(filename);
503 FILE *file;
504 wchar_t wfilename[MAX_PATH], wotype[4];
505 if (filename && !strcmp(filename, "/dev/null"))
506 filename = "nul";
507 if (xutftowcs_path(wfilename, filename) < 0 ||
508 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
509 return NULL;
510 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
511 error("could not unhide %s", filename);
512 return NULL;
513 }
514 file = _wfreopen(wfilename, wotype, stream);
515 if (file && hide && set_hidden_flag(wfilename, 1))
516 warning("could not mark '%s' as hidden.", filename);
517 return file;
518 }
519
520 #undef fflush
521 int mingw_fflush(FILE *stream)
522 {
523 int ret = fflush(stream);
524
525 /*
526 * write() is used behind the scenes of stdio output functions.
527 * Since git code does not check for errors after each stdio write
528 * operation, it can happen that write() is called by a later
529 * stdio function even if an earlier write() call failed. In the
530 * case of a pipe whose readable end was closed, only the first
531 * call to write() reports EPIPE on Windows. Subsequent write()
532 * calls report EINVAL. It is impossible to notice whether this
533 * fflush invocation triggered such a case, therefore, we have to
534 * catch all EINVAL errors whole-sale.
535 */
536 if (ret && errno == EINVAL)
537 errno = EPIPE;
538
539 return ret;
540 }
541
542 #undef write
543 ssize_t mingw_write(int fd, const void *buf, size_t len)
544 {
545 ssize_t result = write(fd, buf, len);
546
547 if (result < 0 && errno == EINVAL && buf) {
548 /* check if fd is a pipe */
549 HANDLE h = (HANDLE) _get_osfhandle(fd);
550 if (GetFileType(h) == FILE_TYPE_PIPE)
551 errno = EPIPE;
552 else
553 errno = EINVAL;
554 }
555
556 return result;
557 }
558
559 int mingw_access(const char *filename, int mode)
560 {
561 wchar_t wfilename[MAX_PATH];
562 if (xutftowcs_path(wfilename, filename) < 0)
563 return -1;
564 /* X_OK is not supported by the MSVCRT version */
565 return _waccess(wfilename, mode & ~X_OK);
566 }
567
568 int mingw_chdir(const char *dirname)
569 {
570 wchar_t wdirname[MAX_PATH];
571 if (xutftowcs_path(wdirname, dirname) < 0)
572 return -1;
573 return _wchdir(wdirname);
574 }
575
576 int mingw_chmod(const char *filename, int mode)
577 {
578 wchar_t wfilename[MAX_PATH];
579 if (xutftowcs_path(wfilename, filename) < 0)
580 return -1;
581 return _wchmod(wfilename, mode);
582 }
583
584 /*
585 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
586 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
587 */
588 static inline long long filetime_to_hnsec(const FILETIME *ft)
589 {
590 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
591 /* Windows to Unix Epoch conversion */
592 return winTime - 116444736000000000LL;
593 }
594
595 static inline time_t filetime_to_time_t(const FILETIME *ft)
596 {
597 return (time_t)(filetime_to_hnsec(ft) / 10000000);
598 }
599
600 /**
601 * Verifies that safe_create_leading_directories() would succeed.
602 */
603 static int has_valid_directory_prefix(wchar_t *wfilename)
604 {
605 int n = wcslen(wfilename);
606
607 while (n > 0) {
608 wchar_t c = wfilename[--n];
609 DWORD attributes;
610
611 if (!is_dir_sep(c))
612 continue;
613
614 wfilename[n] = L'\0';
615 attributes = GetFileAttributesW(wfilename);
616 wfilename[n] = c;
617 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
618 attributes == FILE_ATTRIBUTE_DEVICE)
619 return 1;
620 if (attributes == INVALID_FILE_ATTRIBUTES)
621 switch (GetLastError()) {
622 case ERROR_PATH_NOT_FOUND:
623 continue;
624 case ERROR_FILE_NOT_FOUND:
625 /* This implies parent directory exists. */
626 return 1;
627 }
628 return 0;
629 }
630 return 1;
631 }
632
633 /* We keep the do_lstat code in a separate function to avoid recursion.
634 * When a path ends with a slash, the stat will fail with ENOENT. In
635 * this case, we strip the trailing slashes and stat again.
636 *
637 * If follow is true then act like stat() and report on the link
638 * target. Otherwise report on the link itself.
639 */
640 static int do_lstat(int follow, const char *file_name, struct stat *buf)
641 {
642 WIN32_FILE_ATTRIBUTE_DATA fdata;
643 wchar_t wfilename[MAX_PATH];
644 if (xutftowcs_path(wfilename, file_name) < 0)
645 return -1;
646
647 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
648 buf->st_ino = 0;
649 buf->st_gid = 0;
650 buf->st_uid = 0;
651 buf->st_nlink = 1;
652 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
653 buf->st_size = fdata.nFileSizeLow |
654 (((off_t)fdata.nFileSizeHigh)<<32);
655 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
656 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
657 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
658 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
659 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
660 WIN32_FIND_DATAW findbuf;
661 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
662 if (handle != INVALID_HANDLE_VALUE) {
663 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
664 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
665 if (follow) {
666 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
667 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
668 } else {
669 buf->st_mode = S_IFLNK;
670 }
671 buf->st_mode |= S_IREAD;
672 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
673 buf->st_mode |= S_IWRITE;
674 }
675 FindClose(handle);
676 }
677 }
678 return 0;
679 }
680 switch (GetLastError()) {
681 case ERROR_ACCESS_DENIED:
682 case ERROR_SHARING_VIOLATION:
683 case ERROR_LOCK_VIOLATION:
684 case ERROR_SHARING_BUFFER_EXCEEDED:
685 errno = EACCES;
686 break;
687 case ERROR_BUFFER_OVERFLOW:
688 errno = ENAMETOOLONG;
689 break;
690 case ERROR_NOT_ENOUGH_MEMORY:
691 errno = ENOMEM;
692 break;
693 case ERROR_PATH_NOT_FOUND:
694 if (!has_valid_directory_prefix(wfilename)) {
695 errno = ENOTDIR;
696 break;
697 }
698 /* fallthru */
699 default:
700 errno = ENOENT;
701 break;
702 }
703 return -1;
704 }
705
706 /* We provide our own lstat/fstat functions, since the provided
707 * lstat/fstat functions are so slow. These stat functions are
708 * tailored for Git's usage (read: fast), and are not meant to be
709 * complete. Note that Git stat()s are redirected to mingw_lstat()
710 * too, since Windows doesn't really handle symlinks that well.
711 */
712 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
713 {
714 int namelen;
715 char alt_name[PATH_MAX];
716
717 if (!do_lstat(follow, file_name, buf))
718 return 0;
719
720 /* if file_name ended in a '/', Windows returned ENOENT;
721 * try again without trailing slashes
722 */
723 if (errno != ENOENT)
724 return -1;
725
726 namelen = strlen(file_name);
727 if (namelen && file_name[namelen-1] != '/')
728 return -1;
729 while (namelen && file_name[namelen-1] == '/')
730 --namelen;
731 if (!namelen || namelen >= PATH_MAX)
732 return -1;
733
734 memcpy(alt_name, file_name, namelen);
735 alt_name[namelen] = 0;
736 return do_lstat(follow, alt_name, buf);
737 }
738
739 int mingw_lstat(const char *file_name, struct stat *buf)
740 {
741 return do_stat_internal(0, file_name, buf);
742 }
743 int mingw_stat(const char *file_name, struct stat *buf)
744 {
745 return do_stat_internal(1, file_name, buf);
746 }
747
748 int mingw_fstat(int fd, struct stat *buf)
749 {
750 HANDLE fh = (HANDLE)_get_osfhandle(fd);
751 BY_HANDLE_FILE_INFORMATION fdata;
752
753 if (fh == INVALID_HANDLE_VALUE) {
754 errno = EBADF;
755 return -1;
756 }
757 /* direct non-file handles to MS's fstat() */
758 if (GetFileType(fh) != FILE_TYPE_DISK)
759 return _fstati64(fd, buf);
760
761 if (GetFileInformationByHandle(fh, &fdata)) {
762 buf->st_ino = 0;
763 buf->st_gid = 0;
764 buf->st_uid = 0;
765 buf->st_nlink = 1;
766 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
767 buf->st_size = fdata.nFileSizeLow |
768 (((off_t)fdata.nFileSizeHigh)<<32);
769 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
770 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
771 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
772 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
773 return 0;
774 }
775 errno = EBADF;
776 return -1;
777 }
778
779 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
780 {
781 long long winTime = t * 10000000LL + 116444736000000000LL;
782 ft->dwLowDateTime = winTime;
783 ft->dwHighDateTime = winTime >> 32;
784 }
785
786 int mingw_utime (const char *file_name, const struct utimbuf *times)
787 {
788 FILETIME mft, aft;
789 int fh, rc;
790 DWORD attrs;
791 wchar_t wfilename[MAX_PATH];
792 if (xutftowcs_path(wfilename, file_name) < 0)
793 return -1;
794
795 /* must have write permission */
796 attrs = GetFileAttributesW(wfilename);
797 if (attrs != INVALID_FILE_ATTRIBUTES &&
798 (attrs & FILE_ATTRIBUTE_READONLY)) {
799 /* ignore errors here; open() will report them */
800 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
801 }
802
803 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
804 rc = -1;
805 goto revert_attrs;
806 }
807
808 if (times) {
809 time_t_to_filetime(times->modtime, &mft);
810 time_t_to_filetime(times->actime, &aft);
811 } else {
812 GetSystemTimeAsFileTime(&mft);
813 aft = mft;
814 }
815 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
816 errno = EINVAL;
817 rc = -1;
818 } else
819 rc = 0;
820 close(fh);
821
822 revert_attrs:
823 if (attrs != INVALID_FILE_ATTRIBUTES &&
824 (attrs & FILE_ATTRIBUTE_READONLY)) {
825 /* ignore errors again */
826 SetFileAttributesW(wfilename, attrs);
827 }
828 return rc;
829 }
830
831 #undef strftime
832 size_t mingw_strftime(char *s, size_t max,
833 const char *format, const struct tm *tm)
834 {
835 size_t ret = strftime(s, max, format, tm);
836
837 if (!ret && errno == EINVAL)
838 die("invalid strftime format: '%s'", format);
839 return ret;
840 }
841
842 unsigned int sleep (unsigned int seconds)
843 {
844 Sleep(seconds*1000);
845 return 0;
846 }
847
848 char *mingw_mktemp(char *template)
849 {
850 wchar_t wtemplate[MAX_PATH];
851 if (xutftowcs_path(wtemplate, template) < 0)
852 return NULL;
853 if (!_wmktemp(wtemplate))
854 return NULL;
855 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
856 return NULL;
857 return template;
858 }
859
860 int mkstemp(char *template)
861 {
862 char *filename = mktemp(template);
863 if (filename == NULL)
864 return -1;
865 return open(filename, O_RDWR | O_CREAT, 0600);
866 }
867
868 int gettimeofday(struct timeval *tv, void *tz)
869 {
870 FILETIME ft;
871 long long hnsec;
872
873 GetSystemTimeAsFileTime(&ft);
874 hnsec = filetime_to_hnsec(&ft);
875 tv->tv_sec = hnsec / 10000000;
876 tv->tv_usec = (hnsec % 10000000) / 10;
877 return 0;
878 }
879
880 int pipe(int filedes[2])
881 {
882 HANDLE h[2];
883
884 /* this creates non-inheritable handles */
885 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
886 errno = err_win_to_posix(GetLastError());
887 return -1;
888 }
889 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
890 if (filedes[0] < 0) {
891 CloseHandle(h[0]);
892 CloseHandle(h[1]);
893 return -1;
894 }
895 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
896 if (filedes[1] < 0) {
897 close(filedes[0]);
898 CloseHandle(h[1]);
899 return -1;
900 }
901 return 0;
902 }
903
904 struct tm *gmtime_r(const time_t *timep, struct tm *result)
905 {
906 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
907 memcpy(result, gmtime(timep), sizeof(struct tm));
908 return result;
909 }
910
911 struct tm *localtime_r(const time_t *timep, struct tm *result)
912 {
913 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
914 memcpy(result, localtime(timep), sizeof(struct tm));
915 return result;
916 }
917
918 char *mingw_getcwd(char *pointer, int len)
919 {
920 wchar_t wpointer[MAX_PATH];
921 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
922 return NULL;
923 if (xwcstoutf(pointer, wpointer, len) < 0)
924 return NULL;
925 convert_slashes(pointer);
926 return pointer;
927 }
928
929 /*
930 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
931 * (Parsing C++ Command-Line Arguments)
932 */
933 static const char *quote_arg(const char *arg)
934 {
935 /* count chars to quote */
936 int len = 0, n = 0;
937 int force_quotes = 0;
938 char *q, *d;
939 const char *p = arg;
940 if (!*p) force_quotes = 1;
941 while (*p) {
942 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
943 force_quotes = 1;
944 else if (*p == '"')
945 n++;
946 else if (*p == '\\') {
947 int count = 0;
948 while (*p == '\\') {
949 count++;
950 p++;
951 len++;
952 }
953 if (*p == '"')
954 n += count*2 + 1;
955 continue;
956 }
957 len++;
958 p++;
959 }
960 if (!force_quotes && n == 0)
961 return arg;
962
963 /* insert \ where necessary */
964 d = q = xmalloc(st_add3(len, n, 3));
965 *d++ = '"';
966 while (*arg) {
967 if (*arg == '"')
968 *d++ = '\\';
969 else if (*arg == '\\') {
970 int count = 0;
971 while (*arg == '\\') {
972 count++;
973 *d++ = *arg++;
974 }
975 if (*arg == '"') {
976 while (count-- > 0)
977 *d++ = '\\';
978 *d++ = '\\';
979 }
980 }
981 *d++ = *arg++;
982 }
983 *d++ = '"';
984 *d++ = 0;
985 return q;
986 }
987
988 static const char *parse_interpreter(const char *cmd)
989 {
990 static char buf[100];
991 char *p, *opt;
992 int n, fd;
993
994 /* don't even try a .exe */
995 n = strlen(cmd);
996 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
997 return NULL;
998
999 fd = open(cmd, O_RDONLY);
1000 if (fd < 0)
1001 return NULL;
1002 n = read(fd, buf, sizeof(buf)-1);
1003 close(fd);
1004 if (n < 4) /* at least '#!/x' and not error */
1005 return NULL;
1006
1007 if (buf[0] != '#' || buf[1] != '!')
1008 return NULL;
1009 buf[n] = '\0';
1010 p = buf + strcspn(buf, "\r\n");
1011 if (!*p)
1012 return NULL;
1013
1014 *p = '\0';
1015 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1016 return NULL;
1017 /* strip options */
1018 if ((opt = strchr(p+1, ' ')))
1019 *opt = '\0';
1020 return p+1;
1021 }
1022
1023 /*
1024 * exe_only means that we only want to detect .exe files, but not scripts
1025 * (which do not have an extension)
1026 */
1027 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1028 int isexe, int exe_only)
1029 {
1030 char path[MAX_PATH];
1031 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1032
1033 if (!isexe && access(path, F_OK) == 0)
1034 return xstrdup(path);
1035 path[strlen(path)-4] = '\0';
1036 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1037 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1038 return xstrdup(path);
1039 return NULL;
1040 }
1041
1042 /*
1043 * Determines the absolute path of cmd using the split path in path.
1044 * If cmd contains a slash or backslash, no lookup is performed.
1045 */
1046 static char *path_lookup(const char *cmd, int exe_only)
1047 {
1048 const char *path;
1049 char *prog = NULL;
1050 int len = strlen(cmd);
1051 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1052
1053 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1054 return xstrdup(cmd);
1055
1056 path = mingw_getenv("PATH");
1057 if (!path)
1058 return NULL;
1059
1060 while (!prog) {
1061 const char *sep = strchrnul(path, ';');
1062 int dirlen = sep - path;
1063 if (dirlen)
1064 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1065 if (!*sep)
1066 break;
1067 path = sep + 1;
1068 }
1069
1070 return prog;
1071 }
1072
1073 static int do_putenv(char **env, const char *name, int size, int free_old);
1074
1075 /* used number of elements of environ array, including terminating NULL */
1076 static int environ_size = 0;
1077 /* allocated size of environ array, in bytes */
1078 static int environ_alloc = 0;
1079
1080 /*
1081 * Create environment block suitable for CreateProcess. Merges current
1082 * process environment and the supplied environment changes.
1083 */
1084 static wchar_t *make_environment_block(char **deltaenv)
1085 {
1086 wchar_t *wenvblk = NULL;
1087 char **tmpenv;
1088 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1089
1090 while (deltaenv && deltaenv[i])
1091 i++;
1092
1093 /* copy the environment, leaving space for changes */
1094 ALLOC_ARRAY(tmpenv, size + i);
1095 memcpy(tmpenv, environ, size * sizeof(char*));
1096
1097 /* merge supplied environment changes into the temporary environment */
1098 for (i = 0; deltaenv && deltaenv[i]; i++)
1099 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1100
1101 /* create environment block from temporary environment */
1102 for (i = 0; tmpenv[i]; i++) {
1103 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1104 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1105 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1106 }
1107 /* add final \0 terminator */
1108 wenvblk[wenvpos] = 0;
1109 free(tmpenv);
1110 return wenvblk;
1111 }
1112
1113 struct pinfo_t {
1114 struct pinfo_t *next;
1115 pid_t pid;
1116 HANDLE proc;
1117 };
1118 static struct pinfo_t *pinfo = NULL;
1119 CRITICAL_SECTION pinfo_cs;
1120
1121 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1122 const char *dir,
1123 int prepend_cmd, int fhin, int fhout, int fherr)
1124 {
1125 STARTUPINFOW si;
1126 PROCESS_INFORMATION pi;
1127 struct strbuf args;
1128 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1129 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1130 BOOL ret;
1131
1132 /* Determine whether or not we are associated to a console */
1133 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1134 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1135 FILE_ATTRIBUTE_NORMAL, NULL);
1136 if (cons == INVALID_HANDLE_VALUE) {
1137 /* There is no console associated with this process.
1138 * Since the child is a console process, Windows
1139 * would normally create a console window. But
1140 * since we'll be redirecting std streams, we do
1141 * not need the console.
1142 * It is necessary to use DETACHED_PROCESS
1143 * instead of CREATE_NO_WINDOW to make ssh
1144 * recognize that it has no console.
1145 */
1146 flags |= DETACHED_PROCESS;
1147 } else {
1148 /* There is already a console. If we specified
1149 * DETACHED_PROCESS here, too, Windows would
1150 * disassociate the child from the console.
1151 * The same is true for CREATE_NO_WINDOW.
1152 * Go figure!
1153 */
1154 CloseHandle(cons);
1155 }
1156 memset(&si, 0, sizeof(si));
1157 si.cb = sizeof(si);
1158 si.dwFlags = STARTF_USESTDHANDLES;
1159 si.hStdInput = winansi_get_osfhandle(fhin);
1160 si.hStdOutput = winansi_get_osfhandle(fhout);
1161 si.hStdError = winansi_get_osfhandle(fherr);
1162
1163 if (xutftowcs_path(wcmd, cmd) < 0)
1164 return -1;
1165 if (dir && xutftowcs_path(wdir, dir) < 0)
1166 return -1;
1167
1168 /* concatenate argv, quoting args as we go */
1169 strbuf_init(&args, 0);
1170 if (prepend_cmd) {
1171 char *quoted = (char *)quote_arg(cmd);
1172 strbuf_addstr(&args, quoted);
1173 if (quoted != cmd)
1174 free(quoted);
1175 }
1176 for (; *argv; argv++) {
1177 char *quoted = (char *)quote_arg(*argv);
1178 if (*args.buf)
1179 strbuf_addch(&args, ' ');
1180 strbuf_addstr(&args, quoted);
1181 if (quoted != *argv)
1182 free(quoted);
1183 }
1184
1185 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1186 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1187 strbuf_release(&args);
1188
1189 wenvblk = make_environment_block(deltaenv);
1190
1191 memset(&pi, 0, sizeof(pi));
1192 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1193 wenvblk, dir ? wdir : NULL, &si, &pi);
1194
1195 free(wenvblk);
1196 free(wargs);
1197
1198 if (!ret) {
1199 errno = ENOENT;
1200 return -1;
1201 }
1202 CloseHandle(pi.hThread);
1203
1204 /*
1205 * The process ID is the human-readable identifier of the process
1206 * that we want to present in log and error messages. The handle
1207 * is not useful for this purpose. But we cannot close it, either,
1208 * because it is not possible to turn a process ID into a process
1209 * handle after the process terminated.
1210 * Keep the handle in a list for waitpid.
1211 */
1212 EnterCriticalSection(&pinfo_cs);
1213 {
1214 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1215 info->pid = pi.dwProcessId;
1216 info->proc = pi.hProcess;
1217 info->next = pinfo;
1218 pinfo = info;
1219 }
1220 LeaveCriticalSection(&pinfo_cs);
1221
1222 return (pid_t)pi.dwProcessId;
1223 }
1224
1225 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1226 {
1227 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1228 }
1229
1230 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1231 const char *dir,
1232 int fhin, int fhout, int fherr)
1233 {
1234 pid_t pid;
1235 char *prog = path_lookup(cmd, 0);
1236
1237 if (!prog) {
1238 errno = ENOENT;
1239 pid = -1;
1240 }
1241 else {
1242 const char *interpr = parse_interpreter(prog);
1243
1244 if (interpr) {
1245 const char *argv0 = argv[0];
1246 char *iprog = path_lookup(interpr, 1);
1247 argv[0] = prog;
1248 if (!iprog) {
1249 errno = ENOENT;
1250 pid = -1;
1251 }
1252 else {
1253 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1254 fhin, fhout, fherr);
1255 free(iprog);
1256 }
1257 argv[0] = argv0;
1258 }
1259 else
1260 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1261 fhin, fhout, fherr);
1262 free(prog);
1263 }
1264 return pid;
1265 }
1266
1267 static int try_shell_exec(const char *cmd, char *const *argv)
1268 {
1269 const char *interpr = parse_interpreter(cmd);
1270 char *prog;
1271 int pid = 0;
1272
1273 if (!interpr)
1274 return 0;
1275 prog = path_lookup(interpr, 1);
1276 if (prog) {
1277 int argc = 0;
1278 const char **argv2;
1279 while (argv[argc]) argc++;
1280 ALLOC_ARRAY(argv2, argc + 1);
1281 argv2[0] = (char *)cmd; /* full path to the script file */
1282 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1283 pid = mingw_spawnv(prog, argv2, 1);
1284 if (pid >= 0) {
1285 int status;
1286 if (waitpid(pid, &status, 0) < 0)
1287 status = 255;
1288 exit(status);
1289 }
1290 pid = 1; /* indicate that we tried but failed */
1291 free(prog);
1292 free(argv2);
1293 }
1294 return pid;
1295 }
1296
1297 int mingw_execv(const char *cmd, char *const *argv)
1298 {
1299 /* check if git_command is a shell script */
1300 if (!try_shell_exec(cmd, argv)) {
1301 int pid, status;
1302
1303 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1304 if (pid < 0)
1305 return -1;
1306 if (waitpid(pid, &status, 0) < 0)
1307 status = 255;
1308 exit(status);
1309 }
1310 return -1;
1311 }
1312
1313 int mingw_execvp(const char *cmd, char *const *argv)
1314 {
1315 char *prog = path_lookup(cmd, 0);
1316
1317 if (prog) {
1318 mingw_execv(prog, argv);
1319 free(prog);
1320 } else
1321 errno = ENOENT;
1322
1323 return -1;
1324 }
1325
1326 int mingw_kill(pid_t pid, int sig)
1327 {
1328 if (pid > 0 && sig == SIGTERM) {
1329 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1330
1331 if (TerminateProcess(h, -1)) {
1332 CloseHandle(h);
1333 return 0;
1334 }
1335
1336 errno = err_win_to_posix(GetLastError());
1337 CloseHandle(h);
1338 return -1;
1339 } else if (pid > 0 && sig == 0) {
1340 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1341 if (h) {
1342 CloseHandle(h);
1343 return 0;
1344 }
1345 }
1346
1347 errno = EINVAL;
1348 return -1;
1349 }
1350
1351 /*
1352 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1353 */
1354 static int compareenv(const void *v1, const void *v2)
1355 {
1356 const char *e1 = *(const char**)v1;
1357 const char *e2 = *(const char**)v2;
1358
1359 for (;;) {
1360 int c1 = *e1++;
1361 int c2 = *e2++;
1362 c1 = (c1 == '=') ? 0 : tolower(c1);
1363 c2 = (c2 == '=') ? 0 : tolower(c2);
1364 if (c1 > c2)
1365 return 1;
1366 if (c1 < c2)
1367 return -1;
1368 if (c1 == 0)
1369 return 0;
1370 }
1371 }
1372
1373 static int bsearchenv(char **env, const char *name, size_t size)
1374 {
1375 unsigned low = 0, high = size;
1376 while (low < high) {
1377 unsigned mid = low + ((high - low) >> 1);
1378 int cmp = compareenv(&env[mid], &name);
1379 if (cmp < 0)
1380 low = mid + 1;
1381 else if (cmp > 0)
1382 high = mid;
1383 else
1384 return mid;
1385 }
1386 return ~low; /* not found, return 1's complement of insert position */
1387 }
1388
1389 /*
1390 * If name contains '=', then sets the variable, otherwise it unsets it
1391 * Size includes the terminating NULL. Env must have room for size + 1 entries
1392 * (in case of insert). Returns the new size. Optionally frees removed entries.
1393 */
1394 static int do_putenv(char **env, const char *name, int size, int free_old)
1395 {
1396 int i = bsearchenv(env, name, size - 1);
1397
1398 /* optionally free removed / replaced entry */
1399 if (i >= 0 && free_old)
1400 free(env[i]);
1401
1402 if (strchr(name, '=')) {
1403 /* if new value ('key=value') is specified, insert or replace entry */
1404 if (i < 0) {
1405 i = ~i;
1406 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1407 size++;
1408 }
1409 env[i] = (char*) name;
1410 } else if (i >= 0) {
1411 /* otherwise ('key') remove existing entry */
1412 size--;
1413 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1414 }
1415 return size;
1416 }
1417
1418 char *mingw_getenv(const char *name)
1419 {
1420 char *value;
1421 int pos = bsearchenv(environ, name, environ_size - 1);
1422 if (pos < 0)
1423 return NULL;
1424 value = strchr(environ[pos], '=');
1425 return value ? &value[1] : NULL;
1426 }
1427
1428 int mingw_putenv(const char *namevalue)
1429 {
1430 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1431 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1432 return 0;
1433 }
1434
1435 /*
1436 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1437 * that service contains a numerical port, or that it is null. It
1438 * does a simple search using gethostbyname, and returns one IPv4 host
1439 * if one was found.
1440 */
1441 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1442 const struct addrinfo *hints,
1443 struct addrinfo **res)
1444 {
1445 struct hostent *h = NULL;
1446 struct addrinfo *ai;
1447 struct sockaddr_in *sin;
1448
1449 if (node) {
1450 h = gethostbyname(node);
1451 if (!h)
1452 return WSAGetLastError();
1453 }
1454
1455 ai = xmalloc(sizeof(struct addrinfo));
1456 *res = ai;
1457 ai->ai_flags = 0;
1458 ai->ai_family = AF_INET;
1459 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1460 switch (ai->ai_socktype) {
1461 case SOCK_STREAM:
1462 ai->ai_protocol = IPPROTO_TCP;
1463 break;
1464 case SOCK_DGRAM:
1465 ai->ai_protocol = IPPROTO_UDP;
1466 break;
1467 default:
1468 ai->ai_protocol = 0;
1469 break;
1470 }
1471 ai->ai_addrlen = sizeof(struct sockaddr_in);
1472 if (hints && (hints->ai_flags & AI_CANONNAME))
1473 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1474 else
1475 ai->ai_canonname = NULL;
1476
1477 sin = xcalloc(1, ai->ai_addrlen);
1478 sin->sin_family = AF_INET;
1479 /* Note: getaddrinfo is supposed to allow service to be a string,
1480 * which should be looked up using getservbyname. This is
1481 * currently not implemented */
1482 if (service)
1483 sin->sin_port = htons(atoi(service));
1484 if (h)
1485 sin->sin_addr = *(struct in_addr *)h->h_addr;
1486 else if (hints && (hints->ai_flags & AI_PASSIVE))
1487 sin->sin_addr.s_addr = INADDR_ANY;
1488 else
1489 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1490 ai->ai_addr = (struct sockaddr *)sin;
1491 ai->ai_next = NULL;
1492 return 0;
1493 }
1494
1495 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1496 {
1497 free(res->ai_canonname);
1498 free(res->ai_addr);
1499 free(res);
1500 }
1501
1502 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1503 char *host, DWORD hostlen,
1504 char *serv, DWORD servlen, int flags)
1505 {
1506 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1507 if (sa->sa_family != AF_INET)
1508 return EAI_FAMILY;
1509 if (!host && !serv)
1510 return EAI_NONAME;
1511
1512 if (host && hostlen > 0) {
1513 struct hostent *ent = NULL;
1514 if (!(flags & NI_NUMERICHOST))
1515 ent = gethostbyaddr((const char *)&sin->sin_addr,
1516 sizeof(sin->sin_addr), AF_INET);
1517
1518 if (ent)
1519 snprintf(host, hostlen, "%s", ent->h_name);
1520 else if (flags & NI_NAMEREQD)
1521 return EAI_NONAME;
1522 else
1523 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1524 }
1525
1526 if (serv && servlen > 0) {
1527 struct servent *ent = NULL;
1528 if (!(flags & NI_NUMERICSERV))
1529 ent = getservbyport(sin->sin_port,
1530 flags & NI_DGRAM ? "udp" : "tcp");
1531
1532 if (ent)
1533 snprintf(serv, servlen, "%s", ent->s_name);
1534 else
1535 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1536 }
1537
1538 return 0;
1539 }
1540
1541 static HMODULE ipv6_dll = NULL;
1542 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1543 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1544 const struct addrinfo *hints,
1545 struct addrinfo **res);
1546 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1547 char *host, DWORD hostlen,
1548 char *serv, DWORD servlen, int flags);
1549 /*
1550 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1551 * don't need to try to load that one dynamically.
1552 */
1553
1554 static void socket_cleanup(void)
1555 {
1556 WSACleanup();
1557 if (ipv6_dll)
1558 FreeLibrary(ipv6_dll);
1559 ipv6_dll = NULL;
1560 ipv6_freeaddrinfo = freeaddrinfo_stub;
1561 ipv6_getaddrinfo = getaddrinfo_stub;
1562 ipv6_getnameinfo = getnameinfo_stub;
1563 }
1564
1565 static void ensure_socket_initialization(void)
1566 {
1567 WSADATA wsa;
1568 static int initialized = 0;
1569 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1570 const char **name;
1571
1572 if (initialized)
1573 return;
1574
1575 if (WSAStartup(MAKEWORD(2,2), &wsa))
1576 die("unable to initialize winsock subsystem, error %d",
1577 WSAGetLastError());
1578
1579 for (name = libraries; *name; name++) {
1580 ipv6_dll = LoadLibrary(*name);
1581 if (!ipv6_dll)
1582 continue;
1583
1584 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1585 GetProcAddress(ipv6_dll, "freeaddrinfo");
1586 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1587 const struct addrinfo *,
1588 struct addrinfo **))
1589 GetProcAddress(ipv6_dll, "getaddrinfo");
1590 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1591 socklen_t, char *, DWORD,
1592 char *, DWORD, int))
1593 GetProcAddress(ipv6_dll, "getnameinfo");
1594 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1595 FreeLibrary(ipv6_dll);
1596 ipv6_dll = NULL;
1597 } else
1598 break;
1599 }
1600 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1601 ipv6_freeaddrinfo = freeaddrinfo_stub;
1602 ipv6_getaddrinfo = getaddrinfo_stub;
1603 ipv6_getnameinfo = getnameinfo_stub;
1604 }
1605
1606 atexit(socket_cleanup);
1607 initialized = 1;
1608 }
1609
1610 #undef gethostname
1611 int mingw_gethostname(char *name, int namelen)
1612 {
1613 ensure_socket_initialization();
1614 return gethostname(name, namelen);
1615 }
1616
1617 #undef gethostbyname
1618 struct hostent *mingw_gethostbyname(const char *host)
1619 {
1620 ensure_socket_initialization();
1621 return gethostbyname(host);
1622 }
1623
1624 void mingw_freeaddrinfo(struct addrinfo *res)
1625 {
1626 ipv6_freeaddrinfo(res);
1627 }
1628
1629 int mingw_getaddrinfo(const char *node, const char *service,
1630 const struct addrinfo *hints, struct addrinfo **res)
1631 {
1632 ensure_socket_initialization();
1633 return ipv6_getaddrinfo(node, service, hints, res);
1634 }
1635
1636 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1637 char *host, DWORD hostlen, char *serv, DWORD servlen,
1638 int flags)
1639 {
1640 ensure_socket_initialization();
1641 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1642 }
1643
1644 int mingw_socket(int domain, int type, int protocol)
1645 {
1646 int sockfd;
1647 SOCKET s;
1648
1649 ensure_socket_initialization();
1650 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1651 if (s == INVALID_SOCKET) {
1652 /*
1653 * WSAGetLastError() values are regular BSD error codes
1654 * biased by WSABASEERR.
1655 * However, strerror() does not know about networking
1656 * specific errors, which are values beginning at 38 or so.
1657 * Therefore, we choose to leave the biased error code
1658 * in errno so that _if_ someone looks up the code somewhere,
1659 * then it is at least the number that are usually listed.
1660 */
1661 errno = WSAGetLastError();
1662 return -1;
1663 }
1664 /* convert into a file descriptor */
1665 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1666 closesocket(s);
1667 return error("unable to make a socket file descriptor: %s",
1668 strerror(errno));
1669 }
1670 return sockfd;
1671 }
1672
1673 #undef connect
1674 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1675 {
1676 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1677 return connect(s, sa, sz);
1678 }
1679
1680 #undef bind
1681 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1682 {
1683 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1684 return bind(s, sa, sz);
1685 }
1686
1687 #undef setsockopt
1688 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1689 {
1690 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1691 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1692 }
1693
1694 #undef shutdown
1695 int mingw_shutdown(int sockfd, int how)
1696 {
1697 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1698 return shutdown(s, how);
1699 }
1700
1701 #undef listen
1702 int mingw_listen(int sockfd, int backlog)
1703 {
1704 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1705 return listen(s, backlog);
1706 }
1707
1708 #undef accept
1709 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1710 {
1711 int sockfd2;
1712
1713 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1714 SOCKET s2 = accept(s1, sa, sz);
1715
1716 /* convert into a file descriptor */
1717 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1718 int err = errno;
1719 closesocket(s2);
1720 return error("unable to make a socket file descriptor: %s",
1721 strerror(err));
1722 }
1723 return sockfd2;
1724 }
1725
1726 #undef rename
1727 int mingw_rename(const char *pold, const char *pnew)
1728 {
1729 DWORD attrs, gle;
1730 int tries = 0;
1731 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1732 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1733 return -1;
1734
1735 /*
1736 * Try native rename() first to get errno right.
1737 * It is based on MoveFile(), which cannot overwrite existing files.
1738 */
1739 if (!_wrename(wpold, wpnew))
1740 return 0;
1741 if (errno != EEXIST)
1742 return -1;
1743 repeat:
1744 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1745 return 0;
1746 /* TODO: translate more errors */
1747 gle = GetLastError();
1748 if (gle == ERROR_ACCESS_DENIED &&
1749 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1750 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1751 DWORD attrsold = GetFileAttributesW(wpold);
1752 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1753 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1754 errno = EISDIR;
1755 else if (!_wrmdir(wpnew))
1756 goto repeat;
1757 return -1;
1758 }
1759 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1760 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1761 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1762 return 0;
1763 gle = GetLastError();
1764 /* revert file attributes on failure */
1765 SetFileAttributesW(wpnew, attrs);
1766 }
1767 }
1768 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1769 /*
1770 * We assume that some other process had the source or
1771 * destination file open at the wrong moment and retry.
1772 * In order to give the other process a higher chance to
1773 * complete its operation, we give up our time slice now.
1774 * If we have to retry again, we do sleep a bit.
1775 */
1776 Sleep(delay[tries]);
1777 tries++;
1778 goto repeat;
1779 }
1780 if (gle == ERROR_ACCESS_DENIED &&
1781 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1782 "Should I try again?", pold, pnew))
1783 goto repeat;
1784
1785 errno = EACCES;
1786 return -1;
1787 }
1788
1789 /*
1790 * Note that this doesn't return the actual pagesize, but
1791 * the allocation granularity. If future Windows specific git code
1792 * needs the real getpagesize function, we need to find another solution.
1793 */
1794 int mingw_getpagesize(void)
1795 {
1796 SYSTEM_INFO si;
1797 GetSystemInfo(&si);
1798 return si.dwAllocationGranularity;
1799 }
1800
1801 struct passwd *getpwuid(int uid)
1802 {
1803 static char user_name[100];
1804 static struct passwd p;
1805
1806 DWORD len = sizeof(user_name);
1807 if (!GetUserName(user_name, &len))
1808 return NULL;
1809 p.pw_name = user_name;
1810 p.pw_gecos = "unknown";
1811 p.pw_dir = NULL;
1812 return &p;
1813 }
1814
1815 static HANDLE timer_event;
1816 static HANDLE timer_thread;
1817 static int timer_interval;
1818 static int one_shot;
1819 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1820
1821 /* The timer works like this:
1822 * The thread, ticktack(), is a trivial routine that most of the time
1823 * only waits to receive the signal to terminate. The main thread tells
1824 * the thread to terminate by setting the timer_event to the signalled
1825 * state.
1826 * But ticktack() interrupts the wait state after the timer's interval
1827 * length to call the signal handler.
1828 */
1829
1830 static unsigned __stdcall ticktack(void *dummy)
1831 {
1832 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1833 mingw_raise(SIGALRM);
1834 if (one_shot)
1835 break;
1836 }
1837 return 0;
1838 }
1839
1840 static int start_timer_thread(void)
1841 {
1842 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1843 if (timer_event) {
1844 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1845 if (!timer_thread )
1846 return errno = ENOMEM,
1847 error("cannot start timer thread");
1848 } else
1849 return errno = ENOMEM,
1850 error("cannot allocate resources for timer");
1851 return 0;
1852 }
1853
1854 static void stop_timer_thread(void)
1855 {
1856 if (timer_event)
1857 SetEvent(timer_event); /* tell thread to terminate */
1858 if (timer_thread) {
1859 int rc = WaitForSingleObject(timer_thread, 1000);
1860 if (rc == WAIT_TIMEOUT)
1861 error("timer thread did not terminate timely");
1862 else if (rc != WAIT_OBJECT_0)
1863 error("waiting for timer thread failed: %lu",
1864 GetLastError());
1865 CloseHandle(timer_thread);
1866 }
1867 if (timer_event)
1868 CloseHandle(timer_event);
1869 timer_event = NULL;
1870 timer_thread = NULL;
1871 }
1872
1873 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1874 {
1875 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1876 }
1877
1878 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1879 {
1880 static const struct timeval zero;
1881 static int atexit_done;
1882
1883 if (out != NULL)
1884 return errno = EINVAL,
1885 error("setitimer param 3 != NULL not implemented");
1886 if (!is_timeval_eq(&in->it_interval, &zero) &&
1887 !is_timeval_eq(&in->it_interval, &in->it_value))
1888 return errno = EINVAL,
1889 error("setitimer: it_interval must be zero or eq it_value");
1890
1891 if (timer_thread)
1892 stop_timer_thread();
1893
1894 if (is_timeval_eq(&in->it_value, &zero) &&
1895 is_timeval_eq(&in->it_interval, &zero))
1896 return 0;
1897
1898 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1899 one_shot = is_timeval_eq(&in->it_interval, &zero);
1900 if (!atexit_done) {
1901 atexit(stop_timer_thread);
1902 atexit_done = 1;
1903 }
1904 return start_timer_thread();
1905 }
1906
1907 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1908 {
1909 if (sig != SIGALRM)
1910 return errno = EINVAL,
1911 error("sigaction only implemented for SIGALRM");
1912 if (out != NULL)
1913 return errno = EINVAL,
1914 error("sigaction: param 3 != NULL not implemented");
1915
1916 timer_fn = in->sa_handler;
1917 return 0;
1918 }
1919
1920 #undef signal
1921 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1922 {
1923 sig_handler_t old;
1924
1925 switch (sig) {
1926 case SIGALRM:
1927 old = timer_fn;
1928 timer_fn = handler;
1929 break;
1930
1931 case SIGINT:
1932 old = sigint_fn;
1933 sigint_fn = handler;
1934 break;
1935
1936 default:
1937 return signal(sig, handler);
1938 }
1939
1940 return old;
1941 }
1942
1943 #undef raise
1944 int mingw_raise(int sig)
1945 {
1946 switch (sig) {
1947 case SIGALRM:
1948 if (timer_fn == SIG_DFL) {
1949 if (isatty(STDERR_FILENO))
1950 fputs("Alarm clock\n", stderr);
1951 exit(128 + SIGALRM);
1952 } else if (timer_fn != SIG_IGN)
1953 timer_fn(SIGALRM);
1954 return 0;
1955
1956 case SIGINT:
1957 if (sigint_fn == SIG_DFL)
1958 exit(128 + SIGINT);
1959 else if (sigint_fn != SIG_IGN)
1960 sigint_fn(SIGINT);
1961 return 0;
1962
1963 default:
1964 return raise(sig);
1965 }
1966 }
1967
1968 int link(const char *oldpath, const char *newpath)
1969 {
1970 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1971 static T create_hard_link = NULL;
1972 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1973 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1974 xutftowcs_path(wnewpath, newpath) < 0)
1975 return -1;
1976
1977 if (!create_hard_link) {
1978 create_hard_link = (T) GetProcAddress(
1979 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1980 if (!create_hard_link)
1981 create_hard_link = (T)-1;
1982 }
1983 if (create_hard_link == (T)-1) {
1984 errno = ENOSYS;
1985 return -1;
1986 }
1987 if (!create_hard_link(wnewpath, woldpath, NULL)) {
1988 errno = err_win_to_posix(GetLastError());
1989 return -1;
1990 }
1991 return 0;
1992 }
1993
1994 pid_t waitpid(pid_t pid, int *status, int options)
1995 {
1996 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1997 FALSE, pid);
1998 if (!h) {
1999 errno = ECHILD;
2000 return -1;
2001 }
2002
2003 if (pid > 0 && options & WNOHANG) {
2004 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2005 CloseHandle(h);
2006 return 0;
2007 }
2008 options &= ~WNOHANG;
2009 }
2010
2011 if (options == 0) {
2012 struct pinfo_t **ppinfo;
2013 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2014 CloseHandle(h);
2015 return 0;
2016 }
2017
2018 if (status)
2019 GetExitCodeProcess(h, (LPDWORD)status);
2020
2021 EnterCriticalSection(&pinfo_cs);
2022
2023 ppinfo = &pinfo;
2024 while (*ppinfo) {
2025 struct pinfo_t *info = *ppinfo;
2026 if (info->pid == pid) {
2027 CloseHandle(info->proc);
2028 *ppinfo = info->next;
2029 free(info);
2030 break;
2031 }
2032 ppinfo = &info->next;
2033 }
2034
2035 LeaveCriticalSection(&pinfo_cs);
2036
2037 CloseHandle(h);
2038 return pid;
2039 }
2040 CloseHandle(h);
2041
2042 errno = EINVAL;
2043 return -1;
2044 }
2045
2046 int mingw_skip_dos_drive_prefix(char **path)
2047 {
2048 int ret = has_dos_drive_prefix(*path);
2049 *path += ret;
2050 return ret;
2051 }
2052
2053 int mingw_offset_1st_component(const char *path)
2054 {
2055 char *pos = (char *)path;
2056
2057 /* unc paths */
2058 if (!skip_dos_drive_prefix(&pos) &&
2059 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2060 /* skip server name */
2061 pos = strpbrk(pos + 2, "\\/");
2062 if (!pos)
2063 return 0; /* Error: malformed unc path */
2064
2065 do {
2066 pos++;
2067 } while (*pos && !is_dir_sep(*pos));
2068 }
2069
2070 return pos + is_dir_sep(*pos) - path;
2071 }
2072
2073 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2074 {
2075 int upos = 0, wpos = 0;
2076 const unsigned char *utf = (const unsigned char*) utfs;
2077 if (!utf || !wcs || wcslen < 1) {
2078 errno = EINVAL;
2079 return -1;
2080 }
2081 /* reserve space for \0 */
2082 wcslen--;
2083 if (utflen < 0)
2084 utflen = INT_MAX;
2085
2086 while (upos < utflen) {
2087 int c = utf[upos++] & 0xff;
2088 if (utflen == INT_MAX && c == 0)
2089 break;
2090
2091 if (wpos >= wcslen) {
2092 wcs[wpos] = 0;
2093 errno = ERANGE;
2094 return -1;
2095 }
2096
2097 if (c < 0x80) {
2098 /* ASCII */
2099 wcs[wpos++] = c;
2100 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2101 (utf[upos] & 0xc0) == 0x80) {
2102 /* 2-byte utf-8 */
2103 c = ((c & 0x1f) << 6);
2104 c |= (utf[upos++] & 0x3f);
2105 wcs[wpos++] = c;
2106 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2107 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2108 (utf[upos] & 0xc0) == 0x80 &&
2109 (utf[upos + 1] & 0xc0) == 0x80) {
2110 /* 3-byte utf-8 */
2111 c = ((c & 0x0f) << 12);
2112 c |= ((utf[upos++] & 0x3f) << 6);
2113 c |= (utf[upos++] & 0x3f);
2114 wcs[wpos++] = c;
2115 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2116 wpos + 1 < wcslen &&
2117 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2118 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2119 (utf[upos] & 0xc0) == 0x80 &&
2120 (utf[upos + 1] & 0xc0) == 0x80 &&
2121 (utf[upos + 2] & 0xc0) == 0x80) {
2122 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2123 c = ((c & 0x07) << 18);
2124 c |= ((utf[upos++] & 0x3f) << 12);
2125 c |= ((utf[upos++] & 0x3f) << 6);
2126 c |= (utf[upos++] & 0x3f);
2127 c -= 0x10000;
2128 wcs[wpos++] = 0xd800 | (c >> 10);
2129 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2130 } else if (c >= 0xa0) {
2131 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2132 wcs[wpos++] = c;
2133 } else {
2134 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2135 static const char *hex = "0123456789abcdef";
2136 wcs[wpos++] = hex[c >> 4];
2137 if (wpos < wcslen)
2138 wcs[wpos++] = hex[c & 0x0f];
2139 }
2140 }
2141 wcs[wpos] = 0;
2142 return wpos;
2143 }
2144
2145 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2146 {
2147 if (!wcs || !utf || utflen < 1) {
2148 errno = EINVAL;
2149 return -1;
2150 }
2151 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2152 if (utflen)
2153 return utflen - 1;
2154 errno = ERANGE;
2155 return -1;
2156 }
2157
2158 static void setup_windows_environment(void)
2159 {
2160 char *tmp = getenv("TMPDIR");
2161
2162 /* on Windows it is TMP and TEMP */
2163 if (!tmp) {
2164 if (!(tmp = getenv("TMP")))
2165 tmp = getenv("TEMP");
2166 if (tmp) {
2167 setenv("TMPDIR", tmp, 1);
2168 tmp = getenv("TMPDIR");
2169 }
2170 }
2171
2172 if (tmp) {
2173 /*
2174 * Convert all dir separators to forward slashes,
2175 * to help shell commands called from the Git
2176 * executable (by not mistaking the dir separators
2177 * for escape characters).
2178 */
2179 convert_slashes(tmp);
2180 }
2181
2182 /* simulate TERM to enable auto-color (see color.c) */
2183 if (!getenv("TERM"))
2184 setenv("TERM", "cygwin", 1);
2185 }
2186
2187 /*
2188 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2189 * mingw startup code, see init.c in mingw runtime).
2190 */
2191 int _CRT_glob = 0;
2192
2193 typedef struct {
2194 int newmode;
2195 } _startupinfo;
2196
2197 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2198 _startupinfo *si);
2199
2200 static NORETURN void die_startup(void)
2201 {
2202 fputs("fatal: not enough memory for initialization", stderr);
2203 exit(128);
2204 }
2205
2206 static void *malloc_startup(size_t size)
2207 {
2208 void *result = malloc(size);
2209 if (!result)
2210 die_startup();
2211 return result;
2212 }
2213
2214 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2215 {
2216 len = xwcstoutf(buffer, wcs, len) + 1;
2217 return memcpy(malloc_startup(len), buffer, len);
2218 }
2219
2220 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2221 DWORD desired_access, DWORD flags)
2222 {
2223 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2224 wchar_t buf[MAX_PATH];
2225 DWORD max = ARRAY_SIZE(buf);
2226 HANDLE handle;
2227 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2228
2229 if (!ret || ret >= max)
2230 return;
2231
2232 /* make sure this does not leak into child processes */
2233 SetEnvironmentVariableW(key, NULL);
2234 if (!wcscmp(buf, L"off")) {
2235 close(fd);
2236 handle = GetStdHandle(std_id);
2237 if (handle != INVALID_HANDLE_VALUE)
2238 CloseHandle(handle);
2239 return;
2240 }
2241 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2242 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2243 if (handle == INVALID_HANDLE_VALUE) {
2244 close(fd);
2245 handle = GetStdHandle(std_id);
2246 if (handle != INVALID_HANDLE_VALUE)
2247 CloseHandle(handle);
2248 } else {
2249 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2250 SetStdHandle(std_id, handle);
2251 dup2(new_fd, fd);
2252 /* do *not* close the new_fd: that would close stdout */
2253 }
2254 return;
2255 }
2256 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2257 flags, NULL);
2258 if (handle != INVALID_HANDLE_VALUE) {
2259 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2260 SetStdHandle(std_id, handle);
2261 dup2(new_fd, fd);
2262 close(new_fd);
2263 }
2264 }
2265
2266 static void maybe_redirect_std_handles(void)
2267 {
2268 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2269 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2270 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2271 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2272 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2273 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2274 }
2275
2276 void mingw_startup(void)
2277 {
2278 int i, maxlen, argc;
2279 char *buffer;
2280 wchar_t **wenv, **wargv;
2281 _startupinfo si;
2282
2283 maybe_redirect_std_handles();
2284
2285 /* get wide char arguments and environment */
2286 si.newmode = 0;
2287 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2288 die_startup();
2289
2290 /* determine size of argv and environ conversion buffer */
2291 maxlen = wcslen(wargv[0]);
2292 for (i = 1; i < argc; i++)
2293 maxlen = max(maxlen, wcslen(wargv[i]));
2294 for (i = 0; wenv[i]; i++)
2295 maxlen = max(maxlen, wcslen(wenv[i]));
2296
2297 /*
2298 * nedmalloc can't free CRT memory, allocate resizable environment
2299 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2300 * use it while initializing the environment itself.
2301 */
2302 environ_size = i + 1;
2303 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2304 environ = malloc_startup(environ_alloc);
2305
2306 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2307 maxlen = 3 * maxlen + 1;
2308 buffer = malloc_startup(maxlen);
2309
2310 /* convert command line arguments and environment to UTF-8 */
2311 for (i = 0; i < argc; i++)
2312 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2313 for (i = 0; wenv[i]; i++)
2314 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2315 environ[i] = NULL;
2316 free(buffer);
2317
2318 /* sort environment for O(log n) getenv / putenv */
2319 qsort(environ, i, sizeof(char*), compareenv);
2320
2321 /* fix Windows specific environment settings */
2322 setup_windows_environment();
2323
2324 /* initialize critical section for waitpid pinfo_t list */
2325 InitializeCriticalSection(&pinfo_cs);
2326
2327 /* set up default file mode and file modes for stdin/out/err */
2328 _fmode = _O_BINARY;
2329 _setmode(_fileno(stdin), _O_BINARY);
2330 _setmode(_fileno(stdout), _O_BINARY);
2331 _setmode(_fileno(stderr), _O_BINARY);
2332
2333 /* initialize Unicode console */
2334 winansi_init();
2335 }
2336
2337 int uname(struct utsname *buf)
2338 {
2339 unsigned v = (unsigned)GetVersion();
2340 memset(buf, 0, sizeof(*buf));
2341 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2342 xsnprintf(buf->release, sizeof(buf->release),
2343 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2344 /* assuming NT variants only.. */
2345 xsnprintf(buf->version, sizeof(buf->version),
2346 "%u", (v >> 16) & 0x7fff);
2347 return 0;
2348 }
The Best VCS Around