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mingw: replace MSVCRT's fstat() with a Win32-based implementation
[git/raj.git] / compat / mingw.c
blob07fc0b79ae6b69981084b6a6fa4e2ae85a754655
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 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
740 {
741 BY_HANDLE_FILE_INFORMATION fdata;
742
743 if (!GetFileInformationByHandle(hnd, &fdata)) {
744 errno = err_win_to_posix(GetLastError());
745 return -1;
746 }
747
748 buf->st_ino = 0;
749 buf->st_gid = 0;
750 buf->st_uid = 0;
751 buf->st_nlink = 1;
752 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
753 buf->st_size = fdata.nFileSizeLow |
754 (((off_t)fdata.nFileSizeHigh)<<32);
755 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
756 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
757 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
758 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
759 return 0;
760 }
761
762 int mingw_lstat(const char *file_name, struct stat *buf)
763 {
764 return do_stat_internal(0, file_name, buf);
765 }
766 int mingw_stat(const char *file_name, struct stat *buf)
767 {
768 return do_stat_internal(1, file_name, buf);
769 }
770
771 int mingw_fstat(int fd, struct stat *buf)
772 {
773 HANDLE fh = (HANDLE)_get_osfhandle(fd);
774 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
775
776 switch (type) {
777 case FILE_TYPE_DISK:
778 return get_file_info_by_handle(fh, buf);
779
780 case FILE_TYPE_CHAR:
781 case FILE_TYPE_PIPE:
782 /* initialize stat fields */
783 memset(buf, 0, sizeof(*buf));
784 buf->st_nlink = 1;
785
786 if (type == FILE_TYPE_CHAR) {
787 buf->st_mode = _S_IFCHR;
788 } else {
789 buf->st_mode = _S_IFIFO;
790 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
791 buf->st_size = avail;
792 }
793 return 0;
794
795 default:
796 errno = EBADF;
797 return -1;
798 }
799 }
800
801 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
802 {
803 long long winTime = t * 10000000LL + 116444736000000000LL;
804 ft->dwLowDateTime = winTime;
805 ft->dwHighDateTime = winTime >> 32;
806 }
807
808 int mingw_utime (const char *file_name, const struct utimbuf *times)
809 {
810 FILETIME mft, aft;
811 int fh, rc;
812 DWORD attrs;
813 wchar_t wfilename[MAX_PATH];
814 if (xutftowcs_path(wfilename, file_name) < 0)
815 return -1;
816
817 /* must have write permission */
818 attrs = GetFileAttributesW(wfilename);
819 if (attrs != INVALID_FILE_ATTRIBUTES &&
820 (attrs & FILE_ATTRIBUTE_READONLY)) {
821 /* ignore errors here; open() will report them */
822 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
823 }
824
825 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
826 rc = -1;
827 goto revert_attrs;
828 }
829
830 if (times) {
831 time_t_to_filetime(times->modtime, &mft);
832 time_t_to_filetime(times->actime, &aft);
833 } else {
834 GetSystemTimeAsFileTime(&mft);
835 aft = mft;
836 }
837 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
838 errno = EINVAL;
839 rc = -1;
840 } else
841 rc = 0;
842 close(fh);
843
844 revert_attrs:
845 if (attrs != INVALID_FILE_ATTRIBUTES &&
846 (attrs & FILE_ATTRIBUTE_READONLY)) {
847 /* ignore errors again */
848 SetFileAttributesW(wfilename, attrs);
849 }
850 return rc;
851 }
852
853 #undef strftime
854 size_t mingw_strftime(char *s, size_t max,
855 const char *format, const struct tm *tm)
856 {
857 size_t ret = strftime(s, max, format, tm);
858
859 if (!ret && errno == EINVAL)
860 die("invalid strftime format: '%s'", format);
861 return ret;
862 }
863
864 unsigned int sleep (unsigned int seconds)
865 {
866 Sleep(seconds*1000);
867 return 0;
868 }
869
870 char *mingw_mktemp(char *template)
871 {
872 wchar_t wtemplate[MAX_PATH];
873 if (xutftowcs_path(wtemplate, template) < 0)
874 return NULL;
875 if (!_wmktemp(wtemplate))
876 return NULL;
877 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
878 return NULL;
879 return template;
880 }
881
882 int mkstemp(char *template)
883 {
884 char *filename = mktemp(template);
885 if (filename == NULL)
886 return -1;
887 return open(filename, O_RDWR | O_CREAT, 0600);
888 }
889
890 int gettimeofday(struct timeval *tv, void *tz)
891 {
892 FILETIME ft;
893 long long hnsec;
894
895 GetSystemTimeAsFileTime(&ft);
896 hnsec = filetime_to_hnsec(&ft);
897 tv->tv_sec = hnsec / 10000000;
898 tv->tv_usec = (hnsec % 10000000) / 10;
899 return 0;
900 }
901
902 int pipe(int filedes[2])
903 {
904 HANDLE h[2];
905
906 /* this creates non-inheritable handles */
907 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
908 errno = err_win_to_posix(GetLastError());
909 return -1;
910 }
911 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
912 if (filedes[0] < 0) {
913 CloseHandle(h[0]);
914 CloseHandle(h[1]);
915 return -1;
916 }
917 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
918 if (filedes[1] < 0) {
919 close(filedes[0]);
920 CloseHandle(h[1]);
921 return -1;
922 }
923 return 0;
924 }
925
926 struct tm *gmtime_r(const time_t *timep, struct tm *result)
927 {
928 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
929 memcpy(result, gmtime(timep), sizeof(struct tm));
930 return result;
931 }
932
933 struct tm *localtime_r(const time_t *timep, struct tm *result)
934 {
935 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
936 memcpy(result, localtime(timep), sizeof(struct tm));
937 return result;
938 }
939
940 char *mingw_getcwd(char *pointer, int len)
941 {
942 wchar_t wpointer[MAX_PATH];
943 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
944 return NULL;
945 if (xwcstoutf(pointer, wpointer, len) < 0)
946 return NULL;
947 convert_slashes(pointer);
948 return pointer;
949 }
950
951 /*
952 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
953 * (Parsing C++ Command-Line Arguments)
954 */
955 static const char *quote_arg(const char *arg)
956 {
957 /* count chars to quote */
958 int len = 0, n = 0;
959 int force_quotes = 0;
960 char *q, *d;
961 const char *p = arg;
962 if (!*p) force_quotes = 1;
963 while (*p) {
964 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
965 force_quotes = 1;
966 else if (*p == '"')
967 n++;
968 else if (*p == '\\') {
969 int count = 0;
970 while (*p == '\\') {
971 count++;
972 p++;
973 len++;
974 }
975 if (*p == '"')
976 n += count*2 + 1;
977 continue;
978 }
979 len++;
980 p++;
981 }
982 if (!force_quotes && n == 0)
983 return arg;
984
985 /* insert \ where necessary */
986 d = q = xmalloc(st_add3(len, n, 3));
987 *d++ = '"';
988 while (*arg) {
989 if (*arg == '"')
990 *d++ = '\\';
991 else if (*arg == '\\') {
992 int count = 0;
993 while (*arg == '\\') {
994 count++;
995 *d++ = *arg++;
996 }
997 if (*arg == '"') {
998 while (count-- > 0)
999 *d++ = '\\';
1000 *d++ = '\\';
1001 }
1002 }
1003 *d++ = *arg++;
1004 }
1005 *d++ = '"';
1006 *d++ = 0;
1007 return q;
1008 }
1009
1010 static const char *parse_interpreter(const char *cmd)
1011 {
1012 static char buf[100];
1013 char *p, *opt;
1014 int n, fd;
1015
1016 /* don't even try a .exe */
1017 n = strlen(cmd);
1018 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1019 return NULL;
1020
1021 fd = open(cmd, O_RDONLY);
1022 if (fd < 0)
1023 return NULL;
1024 n = read(fd, buf, sizeof(buf)-1);
1025 close(fd);
1026 if (n < 4) /* at least '#!/x' and not error */
1027 return NULL;
1028
1029 if (buf[0] != '#' || buf[1] != '!')
1030 return NULL;
1031 buf[n] = '\0';
1032 p = buf + strcspn(buf, "\r\n");
1033 if (!*p)
1034 return NULL;
1035
1036 *p = '\0';
1037 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1038 return NULL;
1039 /* strip options */
1040 if ((opt = strchr(p+1, ' ')))
1041 *opt = '\0';
1042 return p+1;
1043 }
1044
1045 /*
1046 * exe_only means that we only want to detect .exe files, but not scripts
1047 * (which do not have an extension)
1048 */
1049 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1050 int isexe, int exe_only)
1051 {
1052 char path[MAX_PATH];
1053 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1054
1055 if (!isexe && access(path, F_OK) == 0)
1056 return xstrdup(path);
1057 path[strlen(path)-4] = '\0';
1058 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1059 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1060 return xstrdup(path);
1061 return NULL;
1062 }
1063
1064 /*
1065 * Determines the absolute path of cmd using the split path in path.
1066 * If cmd contains a slash or backslash, no lookup is performed.
1067 */
1068 static char *path_lookup(const char *cmd, int exe_only)
1069 {
1070 const char *path;
1071 char *prog = NULL;
1072 int len = strlen(cmd);
1073 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1074
1075 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1076 return xstrdup(cmd);
1077
1078 path = mingw_getenv("PATH");
1079 if (!path)
1080 return NULL;
1081
1082 while (!prog) {
1083 const char *sep = strchrnul(path, ';');
1084 int dirlen = sep - path;
1085 if (dirlen)
1086 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1087 if (!*sep)
1088 break;
1089 path = sep + 1;
1090 }
1091
1092 return prog;
1093 }
1094
1095 static int do_putenv(char **env, const char *name, int size, int free_old);
1096
1097 /* used number of elements of environ array, including terminating NULL */
1098 static int environ_size = 0;
1099 /* allocated size of environ array, in bytes */
1100 static int environ_alloc = 0;
1101
1102 /*
1103 * Create environment block suitable for CreateProcess. Merges current
1104 * process environment and the supplied environment changes.
1105 */
1106 static wchar_t *make_environment_block(char **deltaenv)
1107 {
1108 wchar_t *wenvblk = NULL;
1109 char **tmpenv;
1110 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1111
1112 while (deltaenv && deltaenv[i])
1113 i++;
1114
1115 /* copy the environment, leaving space for changes */
1116 ALLOC_ARRAY(tmpenv, size + i);
1117 memcpy(tmpenv, environ, size * sizeof(char*));
1118
1119 /* merge supplied environment changes into the temporary environment */
1120 for (i = 0; deltaenv && deltaenv[i]; i++)
1121 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1122
1123 /* create environment block from temporary environment */
1124 for (i = 0; tmpenv[i]; i++) {
1125 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1126 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1127 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1128 }
1129 /* add final \0 terminator */
1130 wenvblk[wenvpos] = 0;
1131 free(tmpenv);
1132 return wenvblk;
1133 }
1134
1135 struct pinfo_t {
1136 struct pinfo_t *next;
1137 pid_t pid;
1138 HANDLE proc;
1139 };
1140 static struct pinfo_t *pinfo = NULL;
1141 CRITICAL_SECTION pinfo_cs;
1142
1143 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1144 const char *dir,
1145 int prepend_cmd, int fhin, int fhout, int fherr)
1146 {
1147 STARTUPINFOW si;
1148 PROCESS_INFORMATION pi;
1149 struct strbuf args;
1150 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1151 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1152 BOOL ret;
1153
1154 /* Determine whether or not we are associated to a console */
1155 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1156 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1157 FILE_ATTRIBUTE_NORMAL, NULL);
1158 if (cons == INVALID_HANDLE_VALUE) {
1159 /* There is no console associated with this process.
1160 * Since the child is a console process, Windows
1161 * would normally create a console window. But
1162 * since we'll be redirecting std streams, we do
1163 * not need the console.
1164 * It is necessary to use DETACHED_PROCESS
1165 * instead of CREATE_NO_WINDOW to make ssh
1166 * recognize that it has no console.
1167 */
1168 flags |= DETACHED_PROCESS;
1169 } else {
1170 /* There is already a console. If we specified
1171 * DETACHED_PROCESS here, too, Windows would
1172 * disassociate the child from the console.
1173 * The same is true for CREATE_NO_WINDOW.
1174 * Go figure!
1175 */
1176 CloseHandle(cons);
1177 }
1178 memset(&si, 0, sizeof(si));
1179 si.cb = sizeof(si);
1180 si.dwFlags = STARTF_USESTDHANDLES;
1181 si.hStdInput = winansi_get_osfhandle(fhin);
1182 si.hStdOutput = winansi_get_osfhandle(fhout);
1183 si.hStdError = winansi_get_osfhandle(fherr);
1184
1185 if (xutftowcs_path(wcmd, cmd) < 0)
1186 return -1;
1187 if (dir && xutftowcs_path(wdir, dir) < 0)
1188 return -1;
1189
1190 /* concatenate argv, quoting args as we go */
1191 strbuf_init(&args, 0);
1192 if (prepend_cmd) {
1193 char *quoted = (char *)quote_arg(cmd);
1194 strbuf_addstr(&args, quoted);
1195 if (quoted != cmd)
1196 free(quoted);
1197 }
1198 for (; *argv; argv++) {
1199 char *quoted = (char *)quote_arg(*argv);
1200 if (*args.buf)
1201 strbuf_addch(&args, ' ');
1202 strbuf_addstr(&args, quoted);
1203 if (quoted != *argv)
1204 free(quoted);
1205 }
1206
1207 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1208 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1209 strbuf_release(&args);
1210
1211 wenvblk = make_environment_block(deltaenv);
1212
1213 memset(&pi, 0, sizeof(pi));
1214 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1215 wenvblk, dir ? wdir : NULL, &si, &pi);
1216
1217 free(wenvblk);
1218 free(wargs);
1219
1220 if (!ret) {
1221 errno = ENOENT;
1222 return -1;
1223 }
1224 CloseHandle(pi.hThread);
1225
1226 /*
1227 * The process ID is the human-readable identifier of the process
1228 * that we want to present in log and error messages. The handle
1229 * is not useful for this purpose. But we cannot close it, either,
1230 * because it is not possible to turn a process ID into a process
1231 * handle after the process terminated.
1232 * Keep the handle in a list for waitpid.
1233 */
1234 EnterCriticalSection(&pinfo_cs);
1235 {
1236 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1237 info->pid = pi.dwProcessId;
1238 info->proc = pi.hProcess;
1239 info->next = pinfo;
1240 pinfo = info;
1241 }
1242 LeaveCriticalSection(&pinfo_cs);
1243
1244 return (pid_t)pi.dwProcessId;
1245 }
1246
1247 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1248 {
1249 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1250 }
1251
1252 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1253 const char *dir,
1254 int fhin, int fhout, int fherr)
1255 {
1256 pid_t pid;
1257 char *prog = path_lookup(cmd, 0);
1258
1259 if (!prog) {
1260 errno = ENOENT;
1261 pid = -1;
1262 }
1263 else {
1264 const char *interpr = parse_interpreter(prog);
1265
1266 if (interpr) {
1267 const char *argv0 = argv[0];
1268 char *iprog = path_lookup(interpr, 1);
1269 argv[0] = prog;
1270 if (!iprog) {
1271 errno = ENOENT;
1272 pid = -1;
1273 }
1274 else {
1275 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1276 fhin, fhout, fherr);
1277 free(iprog);
1278 }
1279 argv[0] = argv0;
1280 }
1281 else
1282 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1283 fhin, fhout, fherr);
1284 free(prog);
1285 }
1286 return pid;
1287 }
1288
1289 static int try_shell_exec(const char *cmd, char *const *argv)
1290 {
1291 const char *interpr = parse_interpreter(cmd);
1292 char *prog;
1293 int pid = 0;
1294
1295 if (!interpr)
1296 return 0;
1297 prog = path_lookup(interpr, 1);
1298 if (prog) {
1299 int argc = 0;
1300 const char **argv2;
1301 while (argv[argc]) argc++;
1302 ALLOC_ARRAY(argv2, argc + 1);
1303 argv2[0] = (char *)cmd; /* full path to the script file */
1304 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1305 pid = mingw_spawnv(prog, argv2, 1);
1306 if (pid >= 0) {
1307 int status;
1308 if (waitpid(pid, &status, 0) < 0)
1309 status = 255;
1310 exit(status);
1311 }
1312 pid = 1; /* indicate that we tried but failed */
1313 free(prog);
1314 free(argv2);
1315 }
1316 return pid;
1317 }
1318
1319 int mingw_execv(const char *cmd, char *const *argv)
1320 {
1321 /* check if git_command is a shell script */
1322 if (!try_shell_exec(cmd, argv)) {
1323 int pid, status;
1324
1325 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1326 if (pid < 0)
1327 return -1;
1328 if (waitpid(pid, &status, 0) < 0)
1329 status = 255;
1330 exit(status);
1331 }
1332 return -1;
1333 }
1334
1335 int mingw_execvp(const char *cmd, char *const *argv)
1336 {
1337 char *prog = path_lookup(cmd, 0);
1338
1339 if (prog) {
1340 mingw_execv(prog, argv);
1341 free(prog);
1342 } else
1343 errno = ENOENT;
1344
1345 return -1;
1346 }
1347
1348 int mingw_kill(pid_t pid, int sig)
1349 {
1350 if (pid > 0 && sig == SIGTERM) {
1351 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1352
1353 if (TerminateProcess(h, -1)) {
1354 CloseHandle(h);
1355 return 0;
1356 }
1357
1358 errno = err_win_to_posix(GetLastError());
1359 CloseHandle(h);
1360 return -1;
1361 } else if (pid > 0 && sig == 0) {
1362 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1363 if (h) {
1364 CloseHandle(h);
1365 return 0;
1366 }
1367 }
1368
1369 errno = EINVAL;
1370 return -1;
1371 }
1372
1373 /*
1374 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1375 */
1376 static int compareenv(const void *v1, const void *v2)
1377 {
1378 const char *e1 = *(const char**)v1;
1379 const char *e2 = *(const char**)v2;
1380
1381 for (;;) {
1382 int c1 = *e1++;
1383 int c2 = *e2++;
1384 c1 = (c1 == '=') ? 0 : tolower(c1);
1385 c2 = (c2 == '=') ? 0 : tolower(c2);
1386 if (c1 > c2)
1387 return 1;
1388 if (c1 < c2)
1389 return -1;
1390 if (c1 == 0)
1391 return 0;
1392 }
1393 }
1394
1395 static int bsearchenv(char **env, const char *name, size_t size)
1396 {
1397 unsigned low = 0, high = size;
1398 while (low < high) {
1399 unsigned mid = low + ((high - low) >> 1);
1400 int cmp = compareenv(&env[mid], &name);
1401 if (cmp < 0)
1402 low = mid + 1;
1403 else if (cmp > 0)
1404 high = mid;
1405 else
1406 return mid;
1407 }
1408 return ~low; /* not found, return 1's complement of insert position */
1409 }
1410
1411 /*
1412 * If name contains '=', then sets the variable, otherwise it unsets it
1413 * Size includes the terminating NULL. Env must have room for size + 1 entries
1414 * (in case of insert). Returns the new size. Optionally frees removed entries.
1415 */
1416 static int do_putenv(char **env, const char *name, int size, int free_old)
1417 {
1418 int i = bsearchenv(env, name, size - 1);
1419
1420 /* optionally free removed / replaced entry */
1421 if (i >= 0 && free_old)
1422 free(env[i]);
1423
1424 if (strchr(name, '=')) {
1425 /* if new value ('key=value') is specified, insert or replace entry */
1426 if (i < 0) {
1427 i = ~i;
1428 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1429 size++;
1430 }
1431 env[i] = (char*) name;
1432 } else if (i >= 0) {
1433 /* otherwise ('key') remove existing entry */
1434 size--;
1435 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1436 }
1437 return size;
1438 }
1439
1440 char *mingw_getenv(const char *name)
1441 {
1442 char *value;
1443 int pos = bsearchenv(environ, name, environ_size - 1);
1444 if (pos < 0)
1445 return NULL;
1446 value = strchr(environ[pos], '=');
1447 return value ? &value[1] : NULL;
1448 }
1449
1450 int mingw_putenv(const char *namevalue)
1451 {
1452 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1453 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1454 return 0;
1455 }
1456
1457 /*
1458 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1459 * that service contains a numerical port, or that it is null. It
1460 * does a simple search using gethostbyname, and returns one IPv4 host
1461 * if one was found.
1462 */
1463 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1464 const struct addrinfo *hints,
1465 struct addrinfo **res)
1466 {
1467 struct hostent *h = NULL;
1468 struct addrinfo *ai;
1469 struct sockaddr_in *sin;
1470
1471 if (node) {
1472 h = gethostbyname(node);
1473 if (!h)
1474 return WSAGetLastError();
1475 }
1476
1477 ai = xmalloc(sizeof(struct addrinfo));
1478 *res = ai;
1479 ai->ai_flags = 0;
1480 ai->ai_family = AF_INET;
1481 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1482 switch (ai->ai_socktype) {
1483 case SOCK_STREAM:
1484 ai->ai_protocol = IPPROTO_TCP;
1485 break;
1486 case SOCK_DGRAM:
1487 ai->ai_protocol = IPPROTO_UDP;
1488 break;
1489 default:
1490 ai->ai_protocol = 0;
1491 break;
1492 }
1493 ai->ai_addrlen = sizeof(struct sockaddr_in);
1494 if (hints && (hints->ai_flags & AI_CANONNAME))
1495 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1496 else
1497 ai->ai_canonname = NULL;
1498
1499 sin = xcalloc(1, ai->ai_addrlen);
1500 sin->sin_family = AF_INET;
1501 /* Note: getaddrinfo is supposed to allow service to be a string,
1502 * which should be looked up using getservbyname. This is
1503 * currently not implemented */
1504 if (service)
1505 sin->sin_port = htons(atoi(service));
1506 if (h)
1507 sin->sin_addr = *(struct in_addr *)h->h_addr;
1508 else if (hints && (hints->ai_flags & AI_PASSIVE))
1509 sin->sin_addr.s_addr = INADDR_ANY;
1510 else
1511 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1512 ai->ai_addr = (struct sockaddr *)sin;
1513 ai->ai_next = NULL;
1514 return 0;
1515 }
1516
1517 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1518 {
1519 free(res->ai_canonname);
1520 free(res->ai_addr);
1521 free(res);
1522 }
1523
1524 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1525 char *host, DWORD hostlen,
1526 char *serv, DWORD servlen, int flags)
1527 {
1528 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1529 if (sa->sa_family != AF_INET)
1530 return EAI_FAMILY;
1531 if (!host && !serv)
1532 return EAI_NONAME;
1533
1534 if (host && hostlen > 0) {
1535 struct hostent *ent = NULL;
1536 if (!(flags & NI_NUMERICHOST))
1537 ent = gethostbyaddr((const char *)&sin->sin_addr,
1538 sizeof(sin->sin_addr), AF_INET);
1539
1540 if (ent)
1541 snprintf(host, hostlen, "%s", ent->h_name);
1542 else if (flags & NI_NAMEREQD)
1543 return EAI_NONAME;
1544 else
1545 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1546 }
1547
1548 if (serv && servlen > 0) {
1549 struct servent *ent = NULL;
1550 if (!(flags & NI_NUMERICSERV))
1551 ent = getservbyport(sin->sin_port,
1552 flags & NI_DGRAM ? "udp" : "tcp");
1553
1554 if (ent)
1555 snprintf(serv, servlen, "%s", ent->s_name);
1556 else
1557 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1558 }
1559
1560 return 0;
1561 }
1562
1563 static HMODULE ipv6_dll = NULL;
1564 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1565 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1566 const struct addrinfo *hints,
1567 struct addrinfo **res);
1568 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1569 char *host, DWORD hostlen,
1570 char *serv, DWORD servlen, int flags);
1571 /*
1572 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1573 * don't need to try to load that one dynamically.
1574 */
1575
1576 static void socket_cleanup(void)
1577 {
1578 WSACleanup();
1579 if (ipv6_dll)
1580 FreeLibrary(ipv6_dll);
1581 ipv6_dll = NULL;
1582 ipv6_freeaddrinfo = freeaddrinfo_stub;
1583 ipv6_getaddrinfo = getaddrinfo_stub;
1584 ipv6_getnameinfo = getnameinfo_stub;
1585 }
1586
1587 static void ensure_socket_initialization(void)
1588 {
1589 WSADATA wsa;
1590 static int initialized = 0;
1591 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1592 const char **name;
1593
1594 if (initialized)
1595 return;
1596
1597 if (WSAStartup(MAKEWORD(2,2), &wsa))
1598 die("unable to initialize winsock subsystem, error %d",
1599 WSAGetLastError());
1600
1601 for (name = libraries; *name; name++) {
1602 ipv6_dll = LoadLibrary(*name);
1603 if (!ipv6_dll)
1604 continue;
1605
1606 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1607 GetProcAddress(ipv6_dll, "freeaddrinfo");
1608 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1609 const struct addrinfo *,
1610 struct addrinfo **))
1611 GetProcAddress(ipv6_dll, "getaddrinfo");
1612 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1613 socklen_t, char *, DWORD,
1614 char *, DWORD, int))
1615 GetProcAddress(ipv6_dll, "getnameinfo");
1616 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1617 FreeLibrary(ipv6_dll);
1618 ipv6_dll = NULL;
1619 } else
1620 break;
1621 }
1622 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1623 ipv6_freeaddrinfo = freeaddrinfo_stub;
1624 ipv6_getaddrinfo = getaddrinfo_stub;
1625 ipv6_getnameinfo = getnameinfo_stub;
1626 }
1627
1628 atexit(socket_cleanup);
1629 initialized = 1;
1630 }
1631
1632 #undef gethostname
1633 int mingw_gethostname(char *name, int namelen)
1634 {
1635 ensure_socket_initialization();
1636 return gethostname(name, namelen);
1637 }
1638
1639 #undef gethostbyname
1640 struct hostent *mingw_gethostbyname(const char *host)
1641 {
1642 ensure_socket_initialization();
1643 return gethostbyname(host);
1644 }
1645
1646 void mingw_freeaddrinfo(struct addrinfo *res)
1647 {
1648 ipv6_freeaddrinfo(res);
1649 }
1650
1651 int mingw_getaddrinfo(const char *node, const char *service,
1652 const struct addrinfo *hints, struct addrinfo **res)
1653 {
1654 ensure_socket_initialization();
1655 return ipv6_getaddrinfo(node, service, hints, res);
1656 }
1657
1658 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1659 char *host, DWORD hostlen, char *serv, DWORD servlen,
1660 int flags)
1661 {
1662 ensure_socket_initialization();
1663 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1664 }
1665
1666 int mingw_socket(int domain, int type, int protocol)
1667 {
1668 int sockfd;
1669 SOCKET s;
1670
1671 ensure_socket_initialization();
1672 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1673 if (s == INVALID_SOCKET) {
1674 /*
1675 * WSAGetLastError() values are regular BSD error codes
1676 * biased by WSABASEERR.
1677 * However, strerror() does not know about networking
1678 * specific errors, which are values beginning at 38 or so.
1679 * Therefore, we choose to leave the biased error code
1680 * in errno so that _if_ someone looks up the code somewhere,
1681 * then it is at least the number that are usually listed.
1682 */
1683 errno = WSAGetLastError();
1684 return -1;
1685 }
1686 /* convert into a file descriptor */
1687 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1688 closesocket(s);
1689 return error("unable to make a socket file descriptor: %s",
1690 strerror(errno));
1691 }
1692 return sockfd;
1693 }
1694
1695 #undef connect
1696 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1697 {
1698 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1699 return connect(s, sa, sz);
1700 }
1701
1702 #undef bind
1703 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1704 {
1705 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1706 return bind(s, sa, sz);
1707 }
1708
1709 #undef setsockopt
1710 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1711 {
1712 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1713 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1714 }
1715
1716 #undef shutdown
1717 int mingw_shutdown(int sockfd, int how)
1718 {
1719 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1720 return shutdown(s, how);
1721 }
1722
1723 #undef listen
1724 int mingw_listen(int sockfd, int backlog)
1725 {
1726 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1727 return listen(s, backlog);
1728 }
1729
1730 #undef accept
1731 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1732 {
1733 int sockfd2;
1734
1735 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1736 SOCKET s2 = accept(s1, sa, sz);
1737
1738 /* convert into a file descriptor */
1739 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1740 int err = errno;
1741 closesocket(s2);
1742 return error("unable to make a socket file descriptor: %s",
1743 strerror(err));
1744 }
1745 return sockfd2;
1746 }
1747
1748 #undef rename
1749 int mingw_rename(const char *pold, const char *pnew)
1750 {
1751 DWORD attrs, gle;
1752 int tries = 0;
1753 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1754 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1755 return -1;
1756
1757 /*
1758 * Try native rename() first to get errno right.
1759 * It is based on MoveFile(), which cannot overwrite existing files.
1760 */
1761 if (!_wrename(wpold, wpnew))
1762 return 0;
1763 if (errno != EEXIST)
1764 return -1;
1765 repeat:
1766 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1767 return 0;
1768 /* TODO: translate more errors */
1769 gle = GetLastError();
1770 if (gle == ERROR_ACCESS_DENIED &&
1771 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1772 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1773 DWORD attrsold = GetFileAttributesW(wpold);
1774 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1775 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1776 errno = EISDIR;
1777 else if (!_wrmdir(wpnew))
1778 goto repeat;
1779 return -1;
1780 }
1781 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1782 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1783 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1784 return 0;
1785 gle = GetLastError();
1786 /* revert file attributes on failure */
1787 SetFileAttributesW(wpnew, attrs);
1788 }
1789 }
1790 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1791 /*
1792 * We assume that some other process had the source or
1793 * destination file open at the wrong moment and retry.
1794 * In order to give the other process a higher chance to
1795 * complete its operation, we give up our time slice now.
1796 * If we have to retry again, we do sleep a bit.
1797 */
1798 Sleep(delay[tries]);
1799 tries++;
1800 goto repeat;
1801 }
1802 if (gle == ERROR_ACCESS_DENIED &&
1803 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1804 "Should I try again?", pold, pnew))
1805 goto repeat;
1806
1807 errno = EACCES;
1808 return -1;
1809 }
1810
1811 /*
1812 * Note that this doesn't return the actual pagesize, but
1813 * the allocation granularity. If future Windows specific git code
1814 * needs the real getpagesize function, we need to find another solution.
1815 */
1816 int mingw_getpagesize(void)
1817 {
1818 SYSTEM_INFO si;
1819 GetSystemInfo(&si);
1820 return si.dwAllocationGranularity;
1821 }
1822
1823 struct passwd *getpwuid(int uid)
1824 {
1825 static char user_name[100];
1826 static struct passwd p;
1827
1828 DWORD len = sizeof(user_name);
1829 if (!GetUserName(user_name, &len))
1830 return NULL;
1831 p.pw_name = user_name;
1832 p.pw_gecos = "unknown";
1833 p.pw_dir = NULL;
1834 return &p;
1835 }
1836
1837 static HANDLE timer_event;
1838 static HANDLE timer_thread;
1839 static int timer_interval;
1840 static int one_shot;
1841 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1842
1843 /* The timer works like this:
1844 * The thread, ticktack(), is a trivial routine that most of the time
1845 * only waits to receive the signal to terminate. The main thread tells
1846 * the thread to terminate by setting the timer_event to the signalled
1847 * state.
1848 * But ticktack() interrupts the wait state after the timer's interval
1849 * length to call the signal handler.
1850 */
1851
1852 static unsigned __stdcall ticktack(void *dummy)
1853 {
1854 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1855 mingw_raise(SIGALRM);
1856 if (one_shot)
1857 break;
1858 }
1859 return 0;
1860 }
1861
1862 static int start_timer_thread(void)
1863 {
1864 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1865 if (timer_event) {
1866 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1867 if (!timer_thread )
1868 return errno = ENOMEM,
1869 error("cannot start timer thread");
1870 } else
1871 return errno = ENOMEM,
1872 error("cannot allocate resources for timer");
1873 return 0;
1874 }
1875
1876 static void stop_timer_thread(void)
1877 {
1878 if (timer_event)
1879 SetEvent(timer_event); /* tell thread to terminate */
1880 if (timer_thread) {
1881 int rc = WaitForSingleObject(timer_thread, 1000);
1882 if (rc == WAIT_TIMEOUT)
1883 error("timer thread did not terminate timely");
1884 else if (rc != WAIT_OBJECT_0)
1885 error("waiting for timer thread failed: %lu",
1886 GetLastError());
1887 CloseHandle(timer_thread);
1888 }
1889 if (timer_event)
1890 CloseHandle(timer_event);
1891 timer_event = NULL;
1892 timer_thread = NULL;
1893 }
1894
1895 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1896 {
1897 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1898 }
1899
1900 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1901 {
1902 static const struct timeval zero;
1903 static int atexit_done;
1904
1905 if (out != NULL)
1906 return errno = EINVAL,
1907 error("setitimer param 3 != NULL not implemented");
1908 if (!is_timeval_eq(&in->it_interval, &zero) &&
1909 !is_timeval_eq(&in->it_interval, &in->it_value))
1910 return errno = EINVAL,
1911 error("setitimer: it_interval must be zero or eq it_value");
1912
1913 if (timer_thread)
1914 stop_timer_thread();
1915
1916 if (is_timeval_eq(&in->it_value, &zero) &&
1917 is_timeval_eq(&in->it_interval, &zero))
1918 return 0;
1919
1920 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1921 one_shot = is_timeval_eq(&in->it_interval, &zero);
1922 if (!atexit_done) {
1923 atexit(stop_timer_thread);
1924 atexit_done = 1;
1925 }
1926 return start_timer_thread();
1927 }
1928
1929 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1930 {
1931 if (sig != SIGALRM)
1932 return errno = EINVAL,
1933 error("sigaction only implemented for SIGALRM");
1934 if (out != NULL)
1935 return errno = EINVAL,
1936 error("sigaction: param 3 != NULL not implemented");
1937
1938 timer_fn = in->sa_handler;
1939 return 0;
1940 }
1941
1942 #undef signal
1943 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1944 {
1945 sig_handler_t old;
1946
1947 switch (sig) {
1948 case SIGALRM:
1949 old = timer_fn;
1950 timer_fn = handler;
1951 break;
1952
1953 case SIGINT:
1954 old = sigint_fn;
1955 sigint_fn = handler;
1956 break;
1957
1958 default:
1959 return signal(sig, handler);
1960 }
1961
1962 return old;
1963 }
1964
1965 #undef raise
1966 int mingw_raise(int sig)
1967 {
1968 switch (sig) {
1969 case SIGALRM:
1970 if (timer_fn == SIG_DFL) {
1971 if (isatty(STDERR_FILENO))
1972 fputs("Alarm clock\n", stderr);
1973 exit(128 + SIGALRM);
1974 } else if (timer_fn != SIG_IGN)
1975 timer_fn(SIGALRM);
1976 return 0;
1977
1978 case SIGINT:
1979 if (sigint_fn == SIG_DFL)
1980 exit(128 + SIGINT);
1981 else if (sigint_fn != SIG_IGN)
1982 sigint_fn(SIGINT);
1983 return 0;
1984
1985 default:
1986 return raise(sig);
1987 }
1988 }
1989
1990 int link(const char *oldpath, const char *newpath)
1991 {
1992 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1993 static T create_hard_link = NULL;
1994 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1995 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1996 xutftowcs_path(wnewpath, newpath) < 0)
1997 return -1;
1998
1999 if (!create_hard_link) {
2000 create_hard_link = (T) GetProcAddress(
2001 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
2002 if (!create_hard_link)
2003 create_hard_link = (T)-1;
2004 }
2005 if (create_hard_link == (T)-1) {
2006 errno = ENOSYS;
2007 return -1;
2008 }
2009 if (!create_hard_link(wnewpath, woldpath, NULL)) {
2010 errno = err_win_to_posix(GetLastError());
2011 return -1;
2012 }
2013 return 0;
2014 }
2015
2016 pid_t waitpid(pid_t pid, int *status, int options)
2017 {
2018 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2019 FALSE, pid);
2020 if (!h) {
2021 errno = ECHILD;
2022 return -1;
2023 }
2024
2025 if (pid > 0 && options & WNOHANG) {
2026 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2027 CloseHandle(h);
2028 return 0;
2029 }
2030 options &= ~WNOHANG;
2031 }
2032
2033 if (options == 0) {
2034 struct pinfo_t **ppinfo;
2035 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2036 CloseHandle(h);
2037 return 0;
2038 }
2039
2040 if (status)
2041 GetExitCodeProcess(h, (LPDWORD)status);
2042
2043 EnterCriticalSection(&pinfo_cs);
2044
2045 ppinfo = &pinfo;
2046 while (*ppinfo) {
2047 struct pinfo_t *info = *ppinfo;
2048 if (info->pid == pid) {
2049 CloseHandle(info->proc);
2050 *ppinfo = info->next;
2051 free(info);
2052 break;
2053 }
2054 ppinfo = &info->next;
2055 }
2056
2057 LeaveCriticalSection(&pinfo_cs);
2058
2059 CloseHandle(h);
2060 return pid;
2061 }
2062 CloseHandle(h);
2063
2064 errno = EINVAL;
2065 return -1;
2066 }
2067
2068 int mingw_skip_dos_drive_prefix(char **path)
2069 {
2070 int ret = has_dos_drive_prefix(*path);
2071 *path += ret;
2072 return ret;
2073 }
2074
2075 int mingw_offset_1st_component(const char *path)
2076 {
2077 char *pos = (char *)path;
2078
2079 /* unc paths */
2080 if (!skip_dos_drive_prefix(&pos) &&
2081 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2082 /* skip server name */
2083 pos = strpbrk(pos + 2, "\\/");
2084 if (!pos)
2085 return 0; /* Error: malformed unc path */
2086
2087 do {
2088 pos++;
2089 } while (*pos && !is_dir_sep(*pos));
2090 }
2091
2092 return pos + is_dir_sep(*pos) - path;
2093 }
2094
2095 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2096 {
2097 int upos = 0, wpos = 0;
2098 const unsigned char *utf = (const unsigned char*) utfs;
2099 if (!utf || !wcs || wcslen < 1) {
2100 errno = EINVAL;
2101 return -1;
2102 }
2103 /* reserve space for \0 */
2104 wcslen--;
2105 if (utflen < 0)
2106 utflen = INT_MAX;
2107
2108 while (upos < utflen) {
2109 int c = utf[upos++] & 0xff;
2110 if (utflen == INT_MAX && c == 0)
2111 break;
2112
2113 if (wpos >= wcslen) {
2114 wcs[wpos] = 0;
2115 errno = ERANGE;
2116 return -1;
2117 }
2118
2119 if (c < 0x80) {
2120 /* ASCII */
2121 wcs[wpos++] = c;
2122 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2123 (utf[upos] & 0xc0) == 0x80) {
2124 /* 2-byte utf-8 */
2125 c = ((c & 0x1f) << 6);
2126 c |= (utf[upos++] & 0x3f);
2127 wcs[wpos++] = c;
2128 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2129 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2130 (utf[upos] & 0xc0) == 0x80 &&
2131 (utf[upos + 1] & 0xc0) == 0x80) {
2132 /* 3-byte utf-8 */
2133 c = ((c & 0x0f) << 12);
2134 c |= ((utf[upos++] & 0x3f) << 6);
2135 c |= (utf[upos++] & 0x3f);
2136 wcs[wpos++] = c;
2137 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2138 wpos + 1 < wcslen &&
2139 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2140 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2141 (utf[upos] & 0xc0) == 0x80 &&
2142 (utf[upos + 1] & 0xc0) == 0x80 &&
2143 (utf[upos + 2] & 0xc0) == 0x80) {
2144 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2145 c = ((c & 0x07) << 18);
2146 c |= ((utf[upos++] & 0x3f) << 12);
2147 c |= ((utf[upos++] & 0x3f) << 6);
2148 c |= (utf[upos++] & 0x3f);
2149 c -= 0x10000;
2150 wcs[wpos++] = 0xd800 | (c >> 10);
2151 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2152 } else if (c >= 0xa0) {
2153 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2154 wcs[wpos++] = c;
2155 } else {
2156 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2157 static const char *hex = "0123456789abcdef";
2158 wcs[wpos++] = hex[c >> 4];
2159 if (wpos < wcslen)
2160 wcs[wpos++] = hex[c & 0x0f];
2161 }
2162 }
2163 wcs[wpos] = 0;
2164 return wpos;
2165 }
2166
2167 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2168 {
2169 if (!wcs || !utf || utflen < 1) {
2170 errno = EINVAL;
2171 return -1;
2172 }
2173 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2174 if (utflen)
2175 return utflen - 1;
2176 errno = ERANGE;
2177 return -1;
2178 }
2179
2180 static void setup_windows_environment(void)
2181 {
2182 char *tmp = getenv("TMPDIR");
2183
2184 /* on Windows it is TMP and TEMP */
2185 if (!tmp) {
2186 if (!(tmp = getenv("TMP")))
2187 tmp = getenv("TEMP");
2188 if (tmp) {
2189 setenv("TMPDIR", tmp, 1);
2190 tmp = getenv("TMPDIR");
2191 }
2192 }
2193
2194 if (tmp) {
2195 /*
2196 * Convert all dir separators to forward slashes,
2197 * to help shell commands called from the Git
2198 * executable (by not mistaking the dir separators
2199 * for escape characters).
2200 */
2201 convert_slashes(tmp);
2202 }
2203
2204 /* simulate TERM to enable auto-color (see color.c) */
2205 if (!getenv("TERM"))
2206 setenv("TERM", "cygwin", 1);
2207 }
2208
2209 /*
2210 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2211 * mingw startup code, see init.c in mingw runtime).
2212 */
2213 int _CRT_glob = 0;
2214
2215 typedef struct {
2216 int newmode;
2217 } _startupinfo;
2218
2219 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2220 _startupinfo *si);
2221
2222 static NORETURN void die_startup(void)
2223 {
2224 fputs("fatal: not enough memory for initialization", stderr);
2225 exit(128);
2226 }
2227
2228 static void *malloc_startup(size_t size)
2229 {
2230 void *result = malloc(size);
2231 if (!result)
2232 die_startup();
2233 return result;
2234 }
2235
2236 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2237 {
2238 len = xwcstoutf(buffer, wcs, len) + 1;
2239 return memcpy(malloc_startup(len), buffer, len);
2240 }
2241
2242 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2243 DWORD desired_access, DWORD flags)
2244 {
2245 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2246 wchar_t buf[MAX_PATH];
2247 DWORD max = ARRAY_SIZE(buf);
2248 HANDLE handle;
2249 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2250
2251 if (!ret || ret >= max)
2252 return;
2253
2254 /* make sure this does not leak into child processes */
2255 SetEnvironmentVariableW(key, NULL);
2256 if (!wcscmp(buf, L"off")) {
2257 close(fd);
2258 handle = GetStdHandle(std_id);
2259 if (handle != INVALID_HANDLE_VALUE)
2260 CloseHandle(handle);
2261 return;
2262 }
2263 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2264 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2265 if (handle == INVALID_HANDLE_VALUE) {
2266 close(fd);
2267 handle = GetStdHandle(std_id);
2268 if (handle != INVALID_HANDLE_VALUE)
2269 CloseHandle(handle);
2270 } else {
2271 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2272 SetStdHandle(std_id, handle);
2273 dup2(new_fd, fd);
2274 /* do *not* close the new_fd: that would close stdout */
2275 }
2276 return;
2277 }
2278 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2279 flags, NULL);
2280 if (handle != INVALID_HANDLE_VALUE) {
2281 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2282 SetStdHandle(std_id, handle);
2283 dup2(new_fd, fd);
2284 close(new_fd);
2285 }
2286 }
2287
2288 static void maybe_redirect_std_handles(void)
2289 {
2290 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2291 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2292 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2293 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2294 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2295 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2296 }
2297
2298 void mingw_startup(void)
2299 {
2300 int i, maxlen, argc;
2301 char *buffer;
2302 wchar_t **wenv, **wargv;
2303 _startupinfo si;
2304
2305 maybe_redirect_std_handles();
2306
2307 /* get wide char arguments and environment */
2308 si.newmode = 0;
2309 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2310 die_startup();
2311
2312 /* determine size of argv and environ conversion buffer */
2313 maxlen = wcslen(wargv[0]);
2314 for (i = 1; i < argc; i++)
2315 maxlen = max(maxlen, wcslen(wargv[i]));
2316 for (i = 0; wenv[i]; i++)
2317 maxlen = max(maxlen, wcslen(wenv[i]));
2318
2319 /*
2320 * nedmalloc can't free CRT memory, allocate resizable environment
2321 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2322 * use it while initializing the environment itself.
2323 */
2324 environ_size = i + 1;
2325 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2326 environ = malloc_startup(environ_alloc);
2327
2328 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2329 maxlen = 3 * maxlen + 1;
2330 buffer = malloc_startup(maxlen);
2331
2332 /* convert command line arguments and environment to UTF-8 */
2333 for (i = 0; i < argc; i++)
2334 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2335 for (i = 0; wenv[i]; i++)
2336 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2337 environ[i] = NULL;
2338 free(buffer);
2339
2340 /* sort environment for O(log n) getenv / putenv */
2341 qsort(environ, i, sizeof(char*), compareenv);
2342
2343 /* fix Windows specific environment settings */
2344 setup_windows_environment();
2345
2346 /* initialize critical section for waitpid pinfo_t list */
2347 InitializeCriticalSection(&pinfo_cs);
2348
2349 /* set up default file mode and file modes for stdin/out/err */
2350 _fmode = _O_BINARY;
2351 _setmode(_fileno(stdin), _O_BINARY);
2352 _setmode(_fileno(stdout), _O_BINARY);
2353 _setmode(_fileno(stderr), _O_BINARY);
2354
2355 /* initialize Unicode console */
2356 winansi_init();
2357 }
2358
2359 int uname(struct utsname *buf)
2360 {
2361 unsigned v = (unsigned)GetVersion();
2362 memset(buf, 0, sizeof(*buf));
2363 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2364 xsnprintf(buf->release, sizeof(buf->release),
2365 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2366 /* assuming NT variants only.. */
2367 xsnprintf(buf->version, sizeof(buf->version),
2368 "%u", (v >> 16) & 0x7fff);
2369 return 0;
2370 }
ramsay's fork of git