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mingw: implement nanosecond-precision file times
[git/raj.git] / compat / mingw.c
blob26016d02e3fdd5e79b984cc600f9203f82c3f8d4
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 void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
596 {
597 long long hnsec = filetime_to_hnsec(ft);
598 ts->tv_sec = (time_t)(hnsec / 10000000);
599 ts->tv_nsec = (hnsec % 10000000) * 100;
600 }
601
602 /**
603 * Verifies that safe_create_leading_directories() would succeed.
604 */
605 static int has_valid_directory_prefix(wchar_t *wfilename)
606 {
607 int n = wcslen(wfilename);
608
609 while (n > 0) {
610 wchar_t c = wfilename[--n];
611 DWORD attributes;
612
613 if (!is_dir_sep(c))
614 continue;
615
616 wfilename[n] = L'\0';
617 attributes = GetFileAttributesW(wfilename);
618 wfilename[n] = c;
619 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
620 attributes == FILE_ATTRIBUTE_DEVICE)
621 return 1;
622 if (attributes == INVALID_FILE_ATTRIBUTES)
623 switch (GetLastError()) {
624 case ERROR_PATH_NOT_FOUND:
625 continue;
626 case ERROR_FILE_NOT_FOUND:
627 /* This implies parent directory exists. */
628 return 1;
629 }
630 return 0;
631 }
632 return 1;
633 }
634
635 /* We keep the do_lstat code in a separate function to avoid recursion.
636 * When a path ends with a slash, the stat will fail with ENOENT. In
637 * this case, we strip the trailing slashes and stat again.
638 *
639 * If follow is true then act like stat() and report on the link
640 * target. Otherwise report on the link itself.
641 */
642 static int do_lstat(int follow, const char *file_name, struct stat *buf)
643 {
644 WIN32_FILE_ATTRIBUTE_DATA fdata;
645 wchar_t wfilename[MAX_PATH];
646 if (xutftowcs_path(wfilename, file_name) < 0)
647 return -1;
648
649 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
650 buf->st_ino = 0;
651 buf->st_gid = 0;
652 buf->st_uid = 0;
653 buf->st_nlink = 1;
654 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
655 buf->st_size = fdata.nFileSizeLow |
656 (((off_t)fdata.nFileSizeHigh)<<32);
657 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
658 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
659 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
660 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
661 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
662 WIN32_FIND_DATAW findbuf;
663 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
664 if (handle != INVALID_HANDLE_VALUE) {
665 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
666 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
667 if (follow) {
668 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
669 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
670 } else {
671 buf->st_mode = S_IFLNK;
672 }
673 buf->st_mode |= S_IREAD;
674 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
675 buf->st_mode |= S_IWRITE;
676 }
677 FindClose(handle);
678 }
679 }
680 return 0;
681 }
682 switch (GetLastError()) {
683 case ERROR_ACCESS_DENIED:
684 case ERROR_SHARING_VIOLATION:
685 case ERROR_LOCK_VIOLATION:
686 case ERROR_SHARING_BUFFER_EXCEEDED:
687 errno = EACCES;
688 break;
689 case ERROR_BUFFER_OVERFLOW:
690 errno = ENAMETOOLONG;
691 break;
692 case ERROR_NOT_ENOUGH_MEMORY:
693 errno = ENOMEM;
694 break;
695 case ERROR_PATH_NOT_FOUND:
696 if (!has_valid_directory_prefix(wfilename)) {
697 errno = ENOTDIR;
698 break;
699 }
700 /* fallthru */
701 default:
702 errno = ENOENT;
703 break;
704 }
705 return -1;
706 }
707
708 /* We provide our own lstat/fstat functions, since the provided
709 * lstat/fstat functions are so slow. These stat functions are
710 * tailored for Git's usage (read: fast), and are not meant to be
711 * complete. Note that Git stat()s are redirected to mingw_lstat()
712 * too, since Windows doesn't really handle symlinks that well.
713 */
714 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
715 {
716 int namelen;
717 char alt_name[PATH_MAX];
718
719 if (!do_lstat(follow, file_name, buf))
720 return 0;
721
722 /* if file_name ended in a '/', Windows returned ENOENT;
723 * try again without trailing slashes
724 */
725 if (errno != ENOENT)
726 return -1;
727
728 namelen = strlen(file_name);
729 if (namelen && file_name[namelen-1] != '/')
730 return -1;
731 while (namelen && file_name[namelen-1] == '/')
732 --namelen;
733 if (!namelen || namelen >= PATH_MAX)
734 return -1;
735
736 memcpy(alt_name, file_name, namelen);
737 alt_name[namelen] = 0;
738 return do_lstat(follow, alt_name, buf);
739 }
740
741 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
742 {
743 BY_HANDLE_FILE_INFORMATION fdata;
744
745 if (!GetFileInformationByHandle(hnd, &fdata)) {
746 errno = err_win_to_posix(GetLastError());
747 return -1;
748 }
749
750 buf->st_ino = 0;
751 buf->st_gid = 0;
752 buf->st_uid = 0;
753 buf->st_nlink = 1;
754 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
755 buf->st_size = fdata.nFileSizeLow |
756 (((off_t)fdata.nFileSizeHigh)<<32);
757 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
758 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
759 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
760 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
761 return 0;
762 }
763
764 int mingw_lstat(const char *file_name, struct stat *buf)
765 {
766 return do_stat_internal(0, file_name, buf);
767 }
768 int mingw_stat(const char *file_name, struct stat *buf)
769 {
770 return do_stat_internal(1, file_name, buf);
771 }
772
773 int mingw_fstat(int fd, struct stat *buf)
774 {
775 HANDLE fh = (HANDLE)_get_osfhandle(fd);
776 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
777
778 switch (type) {
779 case FILE_TYPE_DISK:
780 return get_file_info_by_handle(fh, buf);
781
782 case FILE_TYPE_CHAR:
783 case FILE_TYPE_PIPE:
784 /* initialize stat fields */
785 memset(buf, 0, sizeof(*buf));
786 buf->st_nlink = 1;
787
788 if (type == FILE_TYPE_CHAR) {
789 buf->st_mode = _S_IFCHR;
790 } else {
791 buf->st_mode = _S_IFIFO;
792 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
793 buf->st_size = avail;
794 }
795 return 0;
796
797 default:
798 errno = EBADF;
799 return -1;
800 }
801 }
802
803 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
804 {
805 long long winTime = t * 10000000LL + 116444736000000000LL;
806 ft->dwLowDateTime = winTime;
807 ft->dwHighDateTime = winTime >> 32;
808 }
809
810 int mingw_utime (const char *file_name, const struct utimbuf *times)
811 {
812 FILETIME mft, aft;
813 int fh, rc;
814 DWORD attrs;
815 wchar_t wfilename[MAX_PATH];
816 if (xutftowcs_path(wfilename, file_name) < 0)
817 return -1;
818
819 /* must have write permission */
820 attrs = GetFileAttributesW(wfilename);
821 if (attrs != INVALID_FILE_ATTRIBUTES &&
822 (attrs & FILE_ATTRIBUTE_READONLY)) {
823 /* ignore errors here; open() will report them */
824 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
825 }
826
827 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
828 rc = -1;
829 goto revert_attrs;
830 }
831
832 if (times) {
833 time_t_to_filetime(times->modtime, &mft);
834 time_t_to_filetime(times->actime, &aft);
835 } else {
836 GetSystemTimeAsFileTime(&mft);
837 aft = mft;
838 }
839 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
840 errno = EINVAL;
841 rc = -1;
842 } else
843 rc = 0;
844 close(fh);
845
846 revert_attrs:
847 if (attrs != INVALID_FILE_ATTRIBUTES &&
848 (attrs & FILE_ATTRIBUTE_READONLY)) {
849 /* ignore errors again */
850 SetFileAttributesW(wfilename, attrs);
851 }
852 return rc;
853 }
854
855 #undef strftime
856 size_t mingw_strftime(char *s, size_t max,
857 const char *format, const struct tm *tm)
858 {
859 size_t ret = strftime(s, max, format, tm);
860
861 if (!ret && errno == EINVAL)
862 die("invalid strftime format: '%s'", format);
863 return ret;
864 }
865
866 unsigned int sleep (unsigned int seconds)
867 {
868 Sleep(seconds*1000);
869 return 0;
870 }
871
872 char *mingw_mktemp(char *template)
873 {
874 wchar_t wtemplate[MAX_PATH];
875 if (xutftowcs_path(wtemplate, template) < 0)
876 return NULL;
877 if (!_wmktemp(wtemplate))
878 return NULL;
879 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
880 return NULL;
881 return template;
882 }
883
884 int mkstemp(char *template)
885 {
886 char *filename = mktemp(template);
887 if (filename == NULL)
888 return -1;
889 return open(filename, O_RDWR | O_CREAT, 0600);
890 }
891
892 int gettimeofday(struct timeval *tv, void *tz)
893 {
894 FILETIME ft;
895 long long hnsec;
896
897 GetSystemTimeAsFileTime(&ft);
898 hnsec = filetime_to_hnsec(&ft);
899 tv->tv_sec = hnsec / 10000000;
900 tv->tv_usec = (hnsec % 10000000) / 10;
901 return 0;
902 }
903
904 int pipe(int filedes[2])
905 {
906 HANDLE h[2];
907
908 /* this creates non-inheritable handles */
909 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
910 errno = err_win_to_posix(GetLastError());
911 return -1;
912 }
913 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
914 if (filedes[0] < 0) {
915 CloseHandle(h[0]);
916 CloseHandle(h[1]);
917 return -1;
918 }
919 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
920 if (filedes[1] < 0) {
921 close(filedes[0]);
922 CloseHandle(h[1]);
923 return -1;
924 }
925 return 0;
926 }
927
928 struct tm *gmtime_r(const time_t *timep, struct tm *result)
929 {
930 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
931 memcpy(result, gmtime(timep), sizeof(struct tm));
932 return result;
933 }
934
935 struct tm *localtime_r(const time_t *timep, struct tm *result)
936 {
937 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
938 memcpy(result, localtime(timep), sizeof(struct tm));
939 return result;
940 }
941
942 char *mingw_getcwd(char *pointer, int len)
943 {
944 wchar_t wpointer[MAX_PATH];
945 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
946 return NULL;
947 if (xwcstoutf(pointer, wpointer, len) < 0)
948 return NULL;
949 convert_slashes(pointer);
950 return pointer;
951 }
952
953 /*
954 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
955 * (Parsing C++ Command-Line Arguments)
956 */
957 static const char *quote_arg(const char *arg)
958 {
959 /* count chars to quote */
960 int len = 0, n = 0;
961 int force_quotes = 0;
962 char *q, *d;
963 const char *p = arg;
964 if (!*p) force_quotes = 1;
965 while (*p) {
966 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
967 force_quotes = 1;
968 else if (*p == '"')
969 n++;
970 else if (*p == '\\') {
971 int count = 0;
972 while (*p == '\\') {
973 count++;
974 p++;
975 len++;
976 }
977 if (*p == '"')
978 n += count*2 + 1;
979 continue;
980 }
981 len++;
982 p++;
983 }
984 if (!force_quotes && n == 0)
985 return arg;
986
987 /* insert \ where necessary */
988 d = q = xmalloc(st_add3(len, n, 3));
989 *d++ = '"';
990 while (*arg) {
991 if (*arg == '"')
992 *d++ = '\\';
993 else if (*arg == '\\') {
994 int count = 0;
995 while (*arg == '\\') {
996 count++;
997 *d++ = *arg++;
998 }
999 if (*arg == '"') {
1000 while (count-- > 0)
1001 *d++ = '\\';
1002 *d++ = '\\';
1003 }
1004 }
1005 *d++ = *arg++;
1006 }
1007 *d++ = '"';
1008 *d++ = 0;
1009 return q;
1010 }
1011
1012 static const char *parse_interpreter(const char *cmd)
1013 {
1014 static char buf[100];
1015 char *p, *opt;
1016 int n, fd;
1017
1018 /* don't even try a .exe */
1019 n = strlen(cmd);
1020 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1021 return NULL;
1022
1023 fd = open(cmd, O_RDONLY);
1024 if (fd < 0)
1025 return NULL;
1026 n = read(fd, buf, sizeof(buf)-1);
1027 close(fd);
1028 if (n < 4) /* at least '#!/x' and not error */
1029 return NULL;
1030
1031 if (buf[0] != '#' || buf[1] != '!')
1032 return NULL;
1033 buf[n] = '\0';
1034 p = buf + strcspn(buf, "\r\n");
1035 if (!*p)
1036 return NULL;
1037
1038 *p = '\0';
1039 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1040 return NULL;
1041 /* strip options */
1042 if ((opt = strchr(p+1, ' ')))
1043 *opt = '\0';
1044 return p+1;
1045 }
1046
1047 /*
1048 * exe_only means that we only want to detect .exe files, but not scripts
1049 * (which do not have an extension)
1050 */
1051 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1052 int isexe, int exe_only)
1053 {
1054 char path[MAX_PATH];
1055 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1056
1057 if (!isexe && access(path, F_OK) == 0)
1058 return xstrdup(path);
1059 path[strlen(path)-4] = '\0';
1060 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1061 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1062 return xstrdup(path);
1063 return NULL;
1064 }
1065
1066 /*
1067 * Determines the absolute path of cmd using the split path in path.
1068 * If cmd contains a slash or backslash, no lookup is performed.
1069 */
1070 static char *path_lookup(const char *cmd, int exe_only)
1071 {
1072 const char *path;
1073 char *prog = NULL;
1074 int len = strlen(cmd);
1075 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1076
1077 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1078 return xstrdup(cmd);
1079
1080 path = mingw_getenv("PATH");
1081 if (!path)
1082 return NULL;
1083
1084 while (!prog) {
1085 const char *sep = strchrnul(path, ';');
1086 int dirlen = sep - path;
1087 if (dirlen)
1088 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1089 if (!*sep)
1090 break;
1091 path = sep + 1;
1092 }
1093
1094 return prog;
1095 }
1096
1097 static int do_putenv(char **env, const char *name, int size, int free_old);
1098
1099 /* used number of elements of environ array, including terminating NULL */
1100 static int environ_size = 0;
1101 /* allocated size of environ array, in bytes */
1102 static int environ_alloc = 0;
1103
1104 /*
1105 * Create environment block suitable for CreateProcess. Merges current
1106 * process environment and the supplied environment changes.
1107 */
1108 static wchar_t *make_environment_block(char **deltaenv)
1109 {
1110 wchar_t *wenvblk = NULL;
1111 char **tmpenv;
1112 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1113
1114 while (deltaenv && deltaenv[i])
1115 i++;
1116
1117 /* copy the environment, leaving space for changes */
1118 ALLOC_ARRAY(tmpenv, size + i);
1119 memcpy(tmpenv, environ, size * sizeof(char*));
1120
1121 /* merge supplied environment changes into the temporary environment */
1122 for (i = 0; deltaenv && deltaenv[i]; i++)
1123 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1124
1125 /* create environment block from temporary environment */
1126 for (i = 0; tmpenv[i]; i++) {
1127 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1128 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1129 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1130 }
1131 /* add final \0 terminator */
1132 wenvblk[wenvpos] = 0;
1133 free(tmpenv);
1134 return wenvblk;
1135 }
1136
1137 struct pinfo_t {
1138 struct pinfo_t *next;
1139 pid_t pid;
1140 HANDLE proc;
1141 };
1142 static struct pinfo_t *pinfo = NULL;
1143 CRITICAL_SECTION pinfo_cs;
1144
1145 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1146 const char *dir,
1147 int prepend_cmd, int fhin, int fhout, int fherr)
1148 {
1149 STARTUPINFOW si;
1150 PROCESS_INFORMATION pi;
1151 struct strbuf args;
1152 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1153 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1154 BOOL ret;
1155
1156 /* Determine whether or not we are associated to a console */
1157 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1158 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1159 FILE_ATTRIBUTE_NORMAL, NULL);
1160 if (cons == INVALID_HANDLE_VALUE) {
1161 /* There is no console associated with this process.
1162 * Since the child is a console process, Windows
1163 * would normally create a console window. But
1164 * since we'll be redirecting std streams, we do
1165 * not need the console.
1166 * It is necessary to use DETACHED_PROCESS
1167 * instead of CREATE_NO_WINDOW to make ssh
1168 * recognize that it has no console.
1169 */
1170 flags |= DETACHED_PROCESS;
1171 } else {
1172 /* There is already a console. If we specified
1173 * DETACHED_PROCESS here, too, Windows would
1174 * disassociate the child from the console.
1175 * The same is true for CREATE_NO_WINDOW.
1176 * Go figure!
1177 */
1178 CloseHandle(cons);
1179 }
1180 memset(&si, 0, sizeof(si));
1181 si.cb = sizeof(si);
1182 si.dwFlags = STARTF_USESTDHANDLES;
1183 si.hStdInput = winansi_get_osfhandle(fhin);
1184 si.hStdOutput = winansi_get_osfhandle(fhout);
1185 si.hStdError = winansi_get_osfhandle(fherr);
1186
1187 if (xutftowcs_path(wcmd, cmd) < 0)
1188 return -1;
1189 if (dir && xutftowcs_path(wdir, dir) < 0)
1190 return -1;
1191
1192 /* concatenate argv, quoting args as we go */
1193 strbuf_init(&args, 0);
1194 if (prepend_cmd) {
1195 char *quoted = (char *)quote_arg(cmd);
1196 strbuf_addstr(&args, quoted);
1197 if (quoted != cmd)
1198 free(quoted);
1199 }
1200 for (; *argv; argv++) {
1201 char *quoted = (char *)quote_arg(*argv);
1202 if (*args.buf)
1203 strbuf_addch(&args, ' ');
1204 strbuf_addstr(&args, quoted);
1205 if (quoted != *argv)
1206 free(quoted);
1207 }
1208
1209 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1210 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1211 strbuf_release(&args);
1212
1213 wenvblk = make_environment_block(deltaenv);
1214
1215 memset(&pi, 0, sizeof(pi));
1216 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1217 wenvblk, dir ? wdir : NULL, &si, &pi);
1218
1219 free(wenvblk);
1220 free(wargs);
1221
1222 if (!ret) {
1223 errno = ENOENT;
1224 return -1;
1225 }
1226 CloseHandle(pi.hThread);
1227
1228 /*
1229 * The process ID is the human-readable identifier of the process
1230 * that we want to present in log and error messages. The handle
1231 * is not useful for this purpose. But we cannot close it, either,
1232 * because it is not possible to turn a process ID into a process
1233 * handle after the process terminated.
1234 * Keep the handle in a list for waitpid.
1235 */
1236 EnterCriticalSection(&pinfo_cs);
1237 {
1238 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1239 info->pid = pi.dwProcessId;
1240 info->proc = pi.hProcess;
1241 info->next = pinfo;
1242 pinfo = info;
1243 }
1244 LeaveCriticalSection(&pinfo_cs);
1245
1246 return (pid_t)pi.dwProcessId;
1247 }
1248
1249 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1250 {
1251 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1252 }
1253
1254 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1255 const char *dir,
1256 int fhin, int fhout, int fherr)
1257 {
1258 pid_t pid;
1259 char *prog = path_lookup(cmd, 0);
1260
1261 if (!prog) {
1262 errno = ENOENT;
1263 pid = -1;
1264 }
1265 else {
1266 const char *interpr = parse_interpreter(prog);
1267
1268 if (interpr) {
1269 const char *argv0 = argv[0];
1270 char *iprog = path_lookup(interpr, 1);
1271 argv[0] = prog;
1272 if (!iprog) {
1273 errno = ENOENT;
1274 pid = -1;
1275 }
1276 else {
1277 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1278 fhin, fhout, fherr);
1279 free(iprog);
1280 }
1281 argv[0] = argv0;
1282 }
1283 else
1284 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1285 fhin, fhout, fherr);
1286 free(prog);
1287 }
1288 return pid;
1289 }
1290
1291 static int try_shell_exec(const char *cmd, char *const *argv)
1292 {
1293 const char *interpr = parse_interpreter(cmd);
1294 char *prog;
1295 int pid = 0;
1296
1297 if (!interpr)
1298 return 0;
1299 prog = path_lookup(interpr, 1);
1300 if (prog) {
1301 int argc = 0;
1302 const char **argv2;
1303 while (argv[argc]) argc++;
1304 ALLOC_ARRAY(argv2, argc + 1);
1305 argv2[0] = (char *)cmd; /* full path to the script file */
1306 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1307 pid = mingw_spawnv(prog, argv2, 1);
1308 if (pid >= 0) {
1309 int status;
1310 if (waitpid(pid, &status, 0) < 0)
1311 status = 255;
1312 exit(status);
1313 }
1314 pid = 1; /* indicate that we tried but failed */
1315 free(prog);
1316 free(argv2);
1317 }
1318 return pid;
1319 }
1320
1321 int mingw_execv(const char *cmd, char *const *argv)
1322 {
1323 /* check if git_command is a shell script */
1324 if (!try_shell_exec(cmd, argv)) {
1325 int pid, status;
1326
1327 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1328 if (pid < 0)
1329 return -1;
1330 if (waitpid(pid, &status, 0) < 0)
1331 status = 255;
1332 exit(status);
1333 }
1334 return -1;
1335 }
1336
1337 int mingw_execvp(const char *cmd, char *const *argv)
1338 {
1339 char *prog = path_lookup(cmd, 0);
1340
1341 if (prog) {
1342 mingw_execv(prog, argv);
1343 free(prog);
1344 } else
1345 errno = ENOENT;
1346
1347 return -1;
1348 }
1349
1350 int mingw_kill(pid_t pid, int sig)
1351 {
1352 if (pid > 0 && sig == SIGTERM) {
1353 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1354
1355 if (TerminateProcess(h, -1)) {
1356 CloseHandle(h);
1357 return 0;
1358 }
1359
1360 errno = err_win_to_posix(GetLastError());
1361 CloseHandle(h);
1362 return -1;
1363 } else if (pid > 0 && sig == 0) {
1364 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1365 if (h) {
1366 CloseHandle(h);
1367 return 0;
1368 }
1369 }
1370
1371 errno = EINVAL;
1372 return -1;
1373 }
1374
1375 /*
1376 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1377 */
1378 static int compareenv(const void *v1, const void *v2)
1379 {
1380 const char *e1 = *(const char**)v1;
1381 const char *e2 = *(const char**)v2;
1382
1383 for (;;) {
1384 int c1 = *e1++;
1385 int c2 = *e2++;
1386 c1 = (c1 == '=') ? 0 : tolower(c1);
1387 c2 = (c2 == '=') ? 0 : tolower(c2);
1388 if (c1 > c2)
1389 return 1;
1390 if (c1 < c2)
1391 return -1;
1392 if (c1 == 0)
1393 return 0;
1394 }
1395 }
1396
1397 static int bsearchenv(char **env, const char *name, size_t size)
1398 {
1399 unsigned low = 0, high = size;
1400 while (low < high) {
1401 unsigned mid = low + ((high - low) >> 1);
1402 int cmp = compareenv(&env[mid], &name);
1403 if (cmp < 0)
1404 low = mid + 1;
1405 else if (cmp > 0)
1406 high = mid;
1407 else
1408 return mid;
1409 }
1410 return ~low; /* not found, return 1's complement of insert position */
1411 }
1412
1413 /*
1414 * If name contains '=', then sets the variable, otherwise it unsets it
1415 * Size includes the terminating NULL. Env must have room for size + 1 entries
1416 * (in case of insert). Returns the new size. Optionally frees removed entries.
1417 */
1418 static int do_putenv(char **env, const char *name, int size, int free_old)
1419 {
1420 int i = bsearchenv(env, name, size - 1);
1421
1422 /* optionally free removed / replaced entry */
1423 if (i >= 0 && free_old)
1424 free(env[i]);
1425
1426 if (strchr(name, '=')) {
1427 /* if new value ('key=value') is specified, insert or replace entry */
1428 if (i < 0) {
1429 i = ~i;
1430 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1431 size++;
1432 }
1433 env[i] = (char*) name;
1434 } else if (i >= 0) {
1435 /* otherwise ('key') remove existing entry */
1436 size--;
1437 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1438 }
1439 return size;
1440 }
1441
1442 char *mingw_getenv(const char *name)
1443 {
1444 char *value;
1445 int pos = bsearchenv(environ, name, environ_size - 1);
1446 if (pos < 0)
1447 return NULL;
1448 value = strchr(environ[pos], '=');
1449 return value ? &value[1] : NULL;
1450 }
1451
1452 int mingw_putenv(const char *namevalue)
1453 {
1454 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1455 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1456 return 0;
1457 }
1458
1459 /*
1460 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1461 * that service contains a numerical port, or that it is null. It
1462 * does a simple search using gethostbyname, and returns one IPv4 host
1463 * if one was found.
1464 */
1465 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1466 const struct addrinfo *hints,
1467 struct addrinfo **res)
1468 {
1469 struct hostent *h = NULL;
1470 struct addrinfo *ai;
1471 struct sockaddr_in *sin;
1472
1473 if (node) {
1474 h = gethostbyname(node);
1475 if (!h)
1476 return WSAGetLastError();
1477 }
1478
1479 ai = xmalloc(sizeof(struct addrinfo));
1480 *res = ai;
1481 ai->ai_flags = 0;
1482 ai->ai_family = AF_INET;
1483 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1484 switch (ai->ai_socktype) {
1485 case SOCK_STREAM:
1486 ai->ai_protocol = IPPROTO_TCP;
1487 break;
1488 case SOCK_DGRAM:
1489 ai->ai_protocol = IPPROTO_UDP;
1490 break;
1491 default:
1492 ai->ai_protocol = 0;
1493 break;
1494 }
1495 ai->ai_addrlen = sizeof(struct sockaddr_in);
1496 if (hints && (hints->ai_flags & AI_CANONNAME))
1497 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1498 else
1499 ai->ai_canonname = NULL;
1500
1501 sin = xcalloc(1, ai->ai_addrlen);
1502 sin->sin_family = AF_INET;
1503 /* Note: getaddrinfo is supposed to allow service to be a string,
1504 * which should be looked up using getservbyname. This is
1505 * currently not implemented */
1506 if (service)
1507 sin->sin_port = htons(atoi(service));
1508 if (h)
1509 sin->sin_addr = *(struct in_addr *)h->h_addr;
1510 else if (hints && (hints->ai_flags & AI_PASSIVE))
1511 sin->sin_addr.s_addr = INADDR_ANY;
1512 else
1513 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1514 ai->ai_addr = (struct sockaddr *)sin;
1515 ai->ai_next = NULL;
1516 return 0;
1517 }
1518
1519 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1520 {
1521 free(res->ai_canonname);
1522 free(res->ai_addr);
1523 free(res);
1524 }
1525
1526 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1527 char *host, DWORD hostlen,
1528 char *serv, DWORD servlen, int flags)
1529 {
1530 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1531 if (sa->sa_family != AF_INET)
1532 return EAI_FAMILY;
1533 if (!host && !serv)
1534 return EAI_NONAME;
1535
1536 if (host && hostlen > 0) {
1537 struct hostent *ent = NULL;
1538 if (!(flags & NI_NUMERICHOST))
1539 ent = gethostbyaddr((const char *)&sin->sin_addr,
1540 sizeof(sin->sin_addr), AF_INET);
1541
1542 if (ent)
1543 snprintf(host, hostlen, "%s", ent->h_name);
1544 else if (flags & NI_NAMEREQD)
1545 return EAI_NONAME;
1546 else
1547 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1548 }
1549
1550 if (serv && servlen > 0) {
1551 struct servent *ent = NULL;
1552 if (!(flags & NI_NUMERICSERV))
1553 ent = getservbyport(sin->sin_port,
1554 flags & NI_DGRAM ? "udp" : "tcp");
1555
1556 if (ent)
1557 snprintf(serv, servlen, "%s", ent->s_name);
1558 else
1559 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1560 }
1561
1562 return 0;
1563 }
1564
1565 static HMODULE ipv6_dll = NULL;
1566 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1567 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1568 const struct addrinfo *hints,
1569 struct addrinfo **res);
1570 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1571 char *host, DWORD hostlen,
1572 char *serv, DWORD servlen, int flags);
1573 /*
1574 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1575 * don't need to try to load that one dynamically.
1576 */
1577
1578 static void socket_cleanup(void)
1579 {
1580 WSACleanup();
1581 if (ipv6_dll)
1582 FreeLibrary(ipv6_dll);
1583 ipv6_dll = NULL;
1584 ipv6_freeaddrinfo = freeaddrinfo_stub;
1585 ipv6_getaddrinfo = getaddrinfo_stub;
1586 ipv6_getnameinfo = getnameinfo_stub;
1587 }
1588
1589 static void ensure_socket_initialization(void)
1590 {
1591 WSADATA wsa;
1592 static int initialized = 0;
1593 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1594 const char **name;
1595
1596 if (initialized)
1597 return;
1598
1599 if (WSAStartup(MAKEWORD(2,2), &wsa))
1600 die("unable to initialize winsock subsystem, error %d",
1601 WSAGetLastError());
1602
1603 for (name = libraries; *name; name++) {
1604 ipv6_dll = LoadLibrary(*name);
1605 if (!ipv6_dll)
1606 continue;
1607
1608 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1609 GetProcAddress(ipv6_dll, "freeaddrinfo");
1610 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1611 const struct addrinfo *,
1612 struct addrinfo **))
1613 GetProcAddress(ipv6_dll, "getaddrinfo");
1614 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1615 socklen_t, char *, DWORD,
1616 char *, DWORD, int))
1617 GetProcAddress(ipv6_dll, "getnameinfo");
1618 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1619 FreeLibrary(ipv6_dll);
1620 ipv6_dll = NULL;
1621 } else
1622 break;
1623 }
1624 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1625 ipv6_freeaddrinfo = freeaddrinfo_stub;
1626 ipv6_getaddrinfo = getaddrinfo_stub;
1627 ipv6_getnameinfo = getnameinfo_stub;
1628 }
1629
1630 atexit(socket_cleanup);
1631 initialized = 1;
1632 }
1633
1634 #undef gethostname
1635 int mingw_gethostname(char *name, int namelen)
1636 {
1637 ensure_socket_initialization();
1638 return gethostname(name, namelen);
1639 }
1640
1641 #undef gethostbyname
1642 struct hostent *mingw_gethostbyname(const char *host)
1643 {
1644 ensure_socket_initialization();
1645 return gethostbyname(host);
1646 }
1647
1648 void mingw_freeaddrinfo(struct addrinfo *res)
1649 {
1650 ipv6_freeaddrinfo(res);
1651 }
1652
1653 int mingw_getaddrinfo(const char *node, const char *service,
1654 const struct addrinfo *hints, struct addrinfo **res)
1655 {
1656 ensure_socket_initialization();
1657 return ipv6_getaddrinfo(node, service, hints, res);
1658 }
1659
1660 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1661 char *host, DWORD hostlen, char *serv, DWORD servlen,
1662 int flags)
1663 {
1664 ensure_socket_initialization();
1665 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1666 }
1667
1668 int mingw_socket(int domain, int type, int protocol)
1669 {
1670 int sockfd;
1671 SOCKET s;
1672
1673 ensure_socket_initialization();
1674 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1675 if (s == INVALID_SOCKET) {
1676 /*
1677 * WSAGetLastError() values are regular BSD error codes
1678 * biased by WSABASEERR.
1679 * However, strerror() does not know about networking
1680 * specific errors, which are values beginning at 38 or so.
1681 * Therefore, we choose to leave the biased error code
1682 * in errno so that _if_ someone looks up the code somewhere,
1683 * then it is at least the number that are usually listed.
1684 */
1685 errno = WSAGetLastError();
1686 return -1;
1687 }
1688 /* convert into a file descriptor */
1689 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1690 closesocket(s);
1691 return error("unable to make a socket file descriptor: %s",
1692 strerror(errno));
1693 }
1694 return sockfd;
1695 }
1696
1697 #undef connect
1698 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1699 {
1700 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1701 return connect(s, sa, sz);
1702 }
1703
1704 #undef bind
1705 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1706 {
1707 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1708 return bind(s, sa, sz);
1709 }
1710
1711 #undef setsockopt
1712 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1713 {
1714 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1715 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1716 }
1717
1718 #undef shutdown
1719 int mingw_shutdown(int sockfd, int how)
1720 {
1721 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1722 return shutdown(s, how);
1723 }
1724
1725 #undef listen
1726 int mingw_listen(int sockfd, int backlog)
1727 {
1728 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1729 return listen(s, backlog);
1730 }
1731
1732 #undef accept
1733 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1734 {
1735 int sockfd2;
1736
1737 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1738 SOCKET s2 = accept(s1, sa, sz);
1739
1740 /* convert into a file descriptor */
1741 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1742 int err = errno;
1743 closesocket(s2);
1744 return error("unable to make a socket file descriptor: %s",
1745 strerror(err));
1746 }
1747 return sockfd2;
1748 }
1749
1750 #undef rename
1751 int mingw_rename(const char *pold, const char *pnew)
1752 {
1753 DWORD attrs, gle;
1754 int tries = 0;
1755 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1756 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1757 return -1;
1758
1759 /*
1760 * Try native rename() first to get errno right.
1761 * It is based on MoveFile(), which cannot overwrite existing files.
1762 */
1763 if (!_wrename(wpold, wpnew))
1764 return 0;
1765 if (errno != EEXIST)
1766 return -1;
1767 repeat:
1768 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1769 return 0;
1770 /* TODO: translate more errors */
1771 gle = GetLastError();
1772 if (gle == ERROR_ACCESS_DENIED &&
1773 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1774 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1775 DWORD attrsold = GetFileAttributesW(wpold);
1776 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1777 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1778 errno = EISDIR;
1779 else if (!_wrmdir(wpnew))
1780 goto repeat;
1781 return -1;
1782 }
1783 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1784 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1785 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1786 return 0;
1787 gle = GetLastError();
1788 /* revert file attributes on failure */
1789 SetFileAttributesW(wpnew, attrs);
1790 }
1791 }
1792 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1793 /*
1794 * We assume that some other process had the source or
1795 * destination file open at the wrong moment and retry.
1796 * In order to give the other process a higher chance to
1797 * complete its operation, we give up our time slice now.
1798 * If we have to retry again, we do sleep a bit.
1799 */
1800 Sleep(delay[tries]);
1801 tries++;
1802 goto repeat;
1803 }
1804 if (gle == ERROR_ACCESS_DENIED &&
1805 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1806 "Should I try again?", pold, pnew))
1807 goto repeat;
1808
1809 errno = EACCES;
1810 return -1;
1811 }
1812
1813 /*
1814 * Note that this doesn't return the actual pagesize, but
1815 * the allocation granularity. If future Windows specific git code
1816 * needs the real getpagesize function, we need to find another solution.
1817 */
1818 int mingw_getpagesize(void)
1819 {
1820 SYSTEM_INFO si;
1821 GetSystemInfo(&si);
1822 return si.dwAllocationGranularity;
1823 }
1824
1825 struct passwd *getpwuid(int uid)
1826 {
1827 static char user_name[100];
1828 static struct passwd p;
1829
1830 DWORD len = sizeof(user_name);
1831 if (!GetUserName(user_name, &len))
1832 return NULL;
1833 p.pw_name = user_name;
1834 p.pw_gecos = "unknown";
1835 p.pw_dir = NULL;
1836 return &p;
1837 }
1838
1839 static HANDLE timer_event;
1840 static HANDLE timer_thread;
1841 static int timer_interval;
1842 static int one_shot;
1843 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1844
1845 /* The timer works like this:
1846 * The thread, ticktack(), is a trivial routine that most of the time
1847 * only waits to receive the signal to terminate. The main thread tells
1848 * the thread to terminate by setting the timer_event to the signalled
1849 * state.
1850 * But ticktack() interrupts the wait state after the timer's interval
1851 * length to call the signal handler.
1852 */
1853
1854 static unsigned __stdcall ticktack(void *dummy)
1855 {
1856 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1857 mingw_raise(SIGALRM);
1858 if (one_shot)
1859 break;
1860 }
1861 return 0;
1862 }
1863
1864 static int start_timer_thread(void)
1865 {
1866 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1867 if (timer_event) {
1868 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1869 if (!timer_thread )
1870 return errno = ENOMEM,
1871 error("cannot start timer thread");
1872 } else
1873 return errno = ENOMEM,
1874 error("cannot allocate resources for timer");
1875 return 0;
1876 }
1877
1878 static void stop_timer_thread(void)
1879 {
1880 if (timer_event)
1881 SetEvent(timer_event); /* tell thread to terminate */
1882 if (timer_thread) {
1883 int rc = WaitForSingleObject(timer_thread, 1000);
1884 if (rc == WAIT_TIMEOUT)
1885 error("timer thread did not terminate timely");
1886 else if (rc != WAIT_OBJECT_0)
1887 error("waiting for timer thread failed: %lu",
1888 GetLastError());
1889 CloseHandle(timer_thread);
1890 }
1891 if (timer_event)
1892 CloseHandle(timer_event);
1893 timer_event = NULL;
1894 timer_thread = NULL;
1895 }
1896
1897 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1898 {
1899 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1900 }
1901
1902 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1903 {
1904 static const struct timeval zero;
1905 static int atexit_done;
1906
1907 if (out != NULL)
1908 return errno = EINVAL,
1909 error("setitimer param 3 != NULL not implemented");
1910 if (!is_timeval_eq(&in->it_interval, &zero) &&
1911 !is_timeval_eq(&in->it_interval, &in->it_value))
1912 return errno = EINVAL,
1913 error("setitimer: it_interval must be zero or eq it_value");
1914
1915 if (timer_thread)
1916 stop_timer_thread();
1917
1918 if (is_timeval_eq(&in->it_value, &zero) &&
1919 is_timeval_eq(&in->it_interval, &zero))
1920 return 0;
1921
1922 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1923 one_shot = is_timeval_eq(&in->it_interval, &zero);
1924 if (!atexit_done) {
1925 atexit(stop_timer_thread);
1926 atexit_done = 1;
1927 }
1928 return start_timer_thread();
1929 }
1930
1931 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1932 {
1933 if (sig != SIGALRM)
1934 return errno = EINVAL,
1935 error("sigaction only implemented for SIGALRM");
1936 if (out != NULL)
1937 return errno = EINVAL,
1938 error("sigaction: param 3 != NULL not implemented");
1939
1940 timer_fn = in->sa_handler;
1941 return 0;
1942 }
1943
1944 #undef signal
1945 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1946 {
1947 sig_handler_t old;
1948
1949 switch (sig) {
1950 case SIGALRM:
1951 old = timer_fn;
1952 timer_fn = handler;
1953 break;
1954
1955 case SIGINT:
1956 old = sigint_fn;
1957 sigint_fn = handler;
1958 break;
1959
1960 default:
1961 return signal(sig, handler);
1962 }
1963
1964 return old;
1965 }
1966
1967 #undef raise
1968 int mingw_raise(int sig)
1969 {
1970 switch (sig) {
1971 case SIGALRM:
1972 if (timer_fn == SIG_DFL) {
1973 if (isatty(STDERR_FILENO))
1974 fputs("Alarm clock\n", stderr);
1975 exit(128 + SIGALRM);
1976 } else if (timer_fn != SIG_IGN)
1977 timer_fn(SIGALRM);
1978 return 0;
1979
1980 case SIGINT:
1981 if (sigint_fn == SIG_DFL)
1982 exit(128 + SIGINT);
1983 else if (sigint_fn != SIG_IGN)
1984 sigint_fn(SIGINT);
1985 return 0;
1986
1987 default:
1988 return raise(sig);
1989 }
1990 }
1991
1992 int link(const char *oldpath, const char *newpath)
1993 {
1994 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1995 static T create_hard_link = NULL;
1996 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1997 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1998 xutftowcs_path(wnewpath, newpath) < 0)
1999 return -1;
2000
2001 if (!create_hard_link) {
2002 create_hard_link = (T) GetProcAddress(
2003 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
2004 if (!create_hard_link)
2005 create_hard_link = (T)-1;
2006 }
2007 if (create_hard_link == (T)-1) {
2008 errno = ENOSYS;
2009 return -1;
2010 }
2011 if (!create_hard_link(wnewpath, woldpath, NULL)) {
2012 errno = err_win_to_posix(GetLastError());
2013 return -1;
2014 }
2015 return 0;
2016 }
2017
2018 pid_t waitpid(pid_t pid, int *status, int options)
2019 {
2020 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2021 FALSE, pid);
2022 if (!h) {
2023 errno = ECHILD;
2024 return -1;
2025 }
2026
2027 if (pid > 0 && options & WNOHANG) {
2028 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2029 CloseHandle(h);
2030 return 0;
2031 }
2032 options &= ~WNOHANG;
2033 }
2034
2035 if (options == 0) {
2036 struct pinfo_t **ppinfo;
2037 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2038 CloseHandle(h);
2039 return 0;
2040 }
2041
2042 if (status)
2043 GetExitCodeProcess(h, (LPDWORD)status);
2044
2045 EnterCriticalSection(&pinfo_cs);
2046
2047 ppinfo = &pinfo;
2048 while (*ppinfo) {
2049 struct pinfo_t *info = *ppinfo;
2050 if (info->pid == pid) {
2051 CloseHandle(info->proc);
2052 *ppinfo = info->next;
2053 free(info);
2054 break;
2055 }
2056 ppinfo = &info->next;
2057 }
2058
2059 LeaveCriticalSection(&pinfo_cs);
2060
2061 CloseHandle(h);
2062 return pid;
2063 }
2064 CloseHandle(h);
2065
2066 errno = EINVAL;
2067 return -1;
2068 }
2069
2070 int mingw_skip_dos_drive_prefix(char **path)
2071 {
2072 int ret = has_dos_drive_prefix(*path);
2073 *path += ret;
2074 return ret;
2075 }
2076
2077 int mingw_offset_1st_component(const char *path)
2078 {
2079 char *pos = (char *)path;
2080
2081 /* unc paths */
2082 if (!skip_dos_drive_prefix(&pos) &&
2083 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2084 /* skip server name */
2085 pos = strpbrk(pos + 2, "\\/");
2086 if (!pos)
2087 return 0; /* Error: malformed unc path */
2088
2089 do {
2090 pos++;
2091 } while (*pos && !is_dir_sep(*pos));
2092 }
2093
2094 return pos + is_dir_sep(*pos) - path;
2095 }
2096
2097 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2098 {
2099 int upos = 0, wpos = 0;
2100 const unsigned char *utf = (const unsigned char*) utfs;
2101 if (!utf || !wcs || wcslen < 1) {
2102 errno = EINVAL;
2103 return -1;
2104 }
2105 /* reserve space for \0 */
2106 wcslen--;
2107 if (utflen < 0)
2108 utflen = INT_MAX;
2109
2110 while (upos < utflen) {
2111 int c = utf[upos++] & 0xff;
2112 if (utflen == INT_MAX && c == 0)
2113 break;
2114
2115 if (wpos >= wcslen) {
2116 wcs[wpos] = 0;
2117 errno = ERANGE;
2118 return -1;
2119 }
2120
2121 if (c < 0x80) {
2122 /* ASCII */
2123 wcs[wpos++] = c;
2124 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2125 (utf[upos] & 0xc0) == 0x80) {
2126 /* 2-byte utf-8 */
2127 c = ((c & 0x1f) << 6);
2128 c |= (utf[upos++] & 0x3f);
2129 wcs[wpos++] = c;
2130 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2131 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2132 (utf[upos] & 0xc0) == 0x80 &&
2133 (utf[upos + 1] & 0xc0) == 0x80) {
2134 /* 3-byte utf-8 */
2135 c = ((c & 0x0f) << 12);
2136 c |= ((utf[upos++] & 0x3f) << 6);
2137 c |= (utf[upos++] & 0x3f);
2138 wcs[wpos++] = c;
2139 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2140 wpos + 1 < wcslen &&
2141 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2142 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2143 (utf[upos] & 0xc0) == 0x80 &&
2144 (utf[upos + 1] & 0xc0) == 0x80 &&
2145 (utf[upos + 2] & 0xc0) == 0x80) {
2146 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2147 c = ((c & 0x07) << 18);
2148 c |= ((utf[upos++] & 0x3f) << 12);
2149 c |= ((utf[upos++] & 0x3f) << 6);
2150 c |= (utf[upos++] & 0x3f);
2151 c -= 0x10000;
2152 wcs[wpos++] = 0xd800 | (c >> 10);
2153 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2154 } else if (c >= 0xa0) {
2155 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2156 wcs[wpos++] = c;
2157 } else {
2158 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2159 static const char *hex = "0123456789abcdef";
2160 wcs[wpos++] = hex[c >> 4];
2161 if (wpos < wcslen)
2162 wcs[wpos++] = hex[c & 0x0f];
2163 }
2164 }
2165 wcs[wpos] = 0;
2166 return wpos;
2167 }
2168
2169 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2170 {
2171 if (!wcs || !utf || utflen < 1) {
2172 errno = EINVAL;
2173 return -1;
2174 }
2175 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2176 if (utflen)
2177 return utflen - 1;
2178 errno = ERANGE;
2179 return -1;
2180 }
2181
2182 static void setup_windows_environment(void)
2183 {
2184 char *tmp = getenv("TMPDIR");
2185
2186 /* on Windows it is TMP and TEMP */
2187 if (!tmp) {
2188 if (!(tmp = getenv("TMP")))
2189 tmp = getenv("TEMP");
2190 if (tmp) {
2191 setenv("TMPDIR", tmp, 1);
2192 tmp = getenv("TMPDIR");
2193 }
2194 }
2195
2196 if (tmp) {
2197 /*
2198 * Convert all dir separators to forward slashes,
2199 * to help shell commands called from the Git
2200 * executable (by not mistaking the dir separators
2201 * for escape characters).
2202 */
2203 convert_slashes(tmp);
2204 }
2205
2206 /* simulate TERM to enable auto-color (see color.c) */
2207 if (!getenv("TERM"))
2208 setenv("TERM", "cygwin", 1);
2209 }
2210
2211 /*
2212 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2213 * mingw startup code, see init.c in mingw runtime).
2214 */
2215 int _CRT_glob = 0;
2216
2217 typedef struct {
2218 int newmode;
2219 } _startupinfo;
2220
2221 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2222 _startupinfo *si);
2223
2224 static NORETURN void die_startup(void)
2225 {
2226 fputs("fatal: not enough memory for initialization", stderr);
2227 exit(128);
2228 }
2229
2230 static void *malloc_startup(size_t size)
2231 {
2232 void *result = malloc(size);
2233 if (!result)
2234 die_startup();
2235 return result;
2236 }
2237
2238 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2239 {
2240 len = xwcstoutf(buffer, wcs, len) + 1;
2241 return memcpy(malloc_startup(len), buffer, len);
2242 }
2243
2244 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2245 DWORD desired_access, DWORD flags)
2246 {
2247 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2248 wchar_t buf[MAX_PATH];
2249 DWORD max = ARRAY_SIZE(buf);
2250 HANDLE handle;
2251 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2252
2253 if (!ret || ret >= max)
2254 return;
2255
2256 /* make sure this does not leak into child processes */
2257 SetEnvironmentVariableW(key, NULL);
2258 if (!wcscmp(buf, L"off")) {
2259 close(fd);
2260 handle = GetStdHandle(std_id);
2261 if (handle != INVALID_HANDLE_VALUE)
2262 CloseHandle(handle);
2263 return;
2264 }
2265 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2266 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2267 if (handle == INVALID_HANDLE_VALUE) {
2268 close(fd);
2269 handle = GetStdHandle(std_id);
2270 if (handle != INVALID_HANDLE_VALUE)
2271 CloseHandle(handle);
2272 } else {
2273 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2274 SetStdHandle(std_id, handle);
2275 dup2(new_fd, fd);
2276 /* do *not* close the new_fd: that would close stdout */
2277 }
2278 return;
2279 }
2280 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2281 flags, NULL);
2282 if (handle != INVALID_HANDLE_VALUE) {
2283 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2284 SetStdHandle(std_id, handle);
2285 dup2(new_fd, fd);
2286 close(new_fd);
2287 }
2288 }
2289
2290 static void maybe_redirect_std_handles(void)
2291 {
2292 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2293 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2294 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2295 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2296 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2297 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2298 }
2299
2300 void mingw_startup(void)
2301 {
2302 int i, maxlen, argc;
2303 char *buffer;
2304 wchar_t **wenv, **wargv;
2305 _startupinfo si;
2306
2307 maybe_redirect_std_handles();
2308
2309 /* get wide char arguments and environment */
2310 si.newmode = 0;
2311 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2312 die_startup();
2313
2314 /* determine size of argv and environ conversion buffer */
2315 maxlen = wcslen(wargv[0]);
2316 for (i = 1; i < argc; i++)
2317 maxlen = max(maxlen, wcslen(wargv[i]));
2318 for (i = 0; wenv[i]; i++)
2319 maxlen = max(maxlen, wcslen(wenv[i]));
2320
2321 /*
2322 * nedmalloc can't free CRT memory, allocate resizable environment
2323 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2324 * use it while initializing the environment itself.
2325 */
2326 environ_size = i + 1;
2327 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2328 environ = malloc_startup(environ_alloc);
2329
2330 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2331 maxlen = 3 * maxlen + 1;
2332 buffer = malloc_startup(maxlen);
2333
2334 /* convert command line arguments and environment to UTF-8 */
2335 for (i = 0; i < argc; i++)
2336 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2337 for (i = 0; wenv[i]; i++)
2338 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2339 environ[i] = NULL;
2340 free(buffer);
2341
2342 /* sort environment for O(log n) getenv / putenv */
2343 qsort(environ, i, sizeof(char*), compareenv);
2344
2345 /* fix Windows specific environment settings */
2346 setup_windows_environment();
2347
2348 /* initialize critical section for waitpid pinfo_t list */
2349 InitializeCriticalSection(&pinfo_cs);
2350
2351 /* set up default file mode and file modes for stdin/out/err */
2352 _fmode = _O_BINARY;
2353 _setmode(_fileno(stdin), _O_BINARY);
2354 _setmode(_fileno(stdout), _O_BINARY);
2355 _setmode(_fileno(stderr), _O_BINARY);
2356
2357 /* initialize Unicode console */
2358 winansi_init();
2359 }
2360
2361 int uname(struct utsname *buf)
2362 {
2363 unsigned v = (unsigned)GetVersion();
2364 memset(buf, 0, sizeof(*buf));
2365 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2366 xsnprintf(buf->release, sizeof(buf->release),
2367 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2368 /* assuming NT variants only.. */
2369 xsnprintf(buf->version, sizeof(buf->version),
2370 "%u", (v >> 16) & 0x7fff);
2371 return 0;
2372 }
ramsay's fork of git