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notes-cache.c: remove the_repository references
[git.git] / compat / mingw.c
blob3b44dd99d79aed48a325b1e59b28d98d0c0790b9
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 #include "win32/lazyload.h"
9
10 #define HCAST(type, handle) ((type)(intptr_t)handle)
11
12 static const int delay[] = { 0, 1, 10, 20, 40 };
13
14 int err_win_to_posix(DWORD winerr)
15 {
16 int error = ENOSYS;
17 switch(winerr) {
18 case ERROR_ACCESS_DENIED: error = EACCES; break;
19 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
20 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
21 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
22 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
23 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
24 case ERROR_BAD_COMMAND: error = EIO; break;
25 case ERROR_BAD_DEVICE: error = ENODEV; break;
26 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
27 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
28 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
29 case ERROR_BAD_LENGTH: error = EINVAL; break;
30 case ERROR_BAD_PATHNAME: error = ENOENT; break;
31 case ERROR_BAD_PIPE: error = EPIPE; break;
32 case ERROR_BAD_UNIT: error = ENODEV; break;
33 case ERROR_BAD_USERNAME: error = EINVAL; break;
34 case ERROR_BROKEN_PIPE: error = EPIPE; break;
35 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
36 case ERROR_BUSY: error = EBUSY; break;
37 case ERROR_BUSY_DRIVE: error = EBUSY; break;
38 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
39 case ERROR_CANNOT_MAKE: error = EACCES; break;
40 case ERROR_CANTOPEN: error = EIO; break;
41 case ERROR_CANTREAD: error = EIO; break;
42 case ERROR_CANTWRITE: error = EIO; break;
43 case ERROR_CRC: error = EIO; break;
44 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
45 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
46 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
47 case ERROR_DIRECTORY: error = EINVAL; break;
48 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
49 case ERROR_DISK_CHANGE: error = EIO; break;
50 case ERROR_DISK_FULL: error = ENOSPC; break;
51 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
52 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
53 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
54 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
55 case ERROR_FILE_EXISTS: error = EEXIST; break;
56 case ERROR_FILE_INVALID: error = ENODEV; break;
57 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
58 case ERROR_GEN_FAILURE: error = EIO; break;
59 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
60 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
61 case ERROR_INVALID_ACCESS: error = EACCES; break;
62 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
63 case ERROR_INVALID_BLOCK: error = EFAULT; break;
64 case ERROR_INVALID_DATA: error = EINVAL; break;
65 case ERROR_INVALID_DRIVE: error = ENODEV; break;
66 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
67 case ERROR_INVALID_FLAGS: error = EINVAL; break;
68 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
69 case ERROR_INVALID_HANDLE: error = EBADF; break;
70 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
71 case ERROR_INVALID_NAME: error = EINVAL; break;
72 case ERROR_INVALID_OWNER: error = EINVAL; break;
73 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
74 case ERROR_INVALID_PASSWORD: error = EPERM; break;
75 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
76 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
77 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
78 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
79 case ERROR_IO_DEVICE: error = EIO; break;
80 case ERROR_IO_INCOMPLETE: error = EINTR; break;
81 case ERROR_LOCKED: error = EBUSY; break;
82 case ERROR_LOCK_VIOLATION: error = EACCES; break;
83 case ERROR_LOGON_FAILURE: error = EACCES; break;
84 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
85 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
86 case ERROR_MORE_DATA: error = EPIPE; break;
87 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
88 case ERROR_NOACCESS: error = EFAULT; break;
89 case ERROR_NONE_MAPPED: error = EINVAL; break;
90 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
91 case ERROR_NOT_READY: error = EAGAIN; break;
92 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
93 case ERROR_NO_DATA: error = EPIPE; break;
94 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
95 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
96 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
97 case ERROR_OPEN_FAILED: error = EIO; break;
98 case ERROR_OPEN_FILES: error = EBUSY; break;
99 case ERROR_OPERATION_ABORTED: error = EINTR; break;
100 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
101 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
102 case ERROR_PATH_BUSY: error = EBUSY; break;
103 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
104 case ERROR_PIPE_BUSY: error = EBUSY; break;
105 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
106 case ERROR_PIPE_LISTENING: error = EPIPE; break;
107 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
108 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
109 case ERROR_READ_FAULT: error = EIO; break;
110 case ERROR_SEEK: error = EIO; break;
111 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
112 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
113 case ERROR_SHARING_VIOLATION: error = EACCES; break;
114 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
115 case ERROR_SWAPERROR: error = ENOENT; break;
116 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
117 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
118 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
119 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
120 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
121 case ERROR_WRITE_FAULT: error = EIO; break;
122 case ERROR_WRITE_PROTECT: error = EROFS; break;
123 }
124 return error;
125 }
126
127 static inline int is_file_in_use_error(DWORD errcode)
128 {
129 switch (errcode) {
130 case ERROR_SHARING_VIOLATION:
131 case ERROR_ACCESS_DENIED:
132 return 1;
133 }
134
135 return 0;
136 }
137
138 static int read_yes_no_answer(void)
139 {
140 char answer[1024];
141
142 if (fgets(answer, sizeof(answer), stdin)) {
143 size_t answer_len = strlen(answer);
144 int got_full_line = 0, c;
145
146 /* remove the newline */
147 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
148 answer[answer_len-2] = '\0';
149 got_full_line = 1;
150 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
151 answer[answer_len-1] = '\0';
152 got_full_line = 1;
153 }
154 /* flush the buffer in case we did not get the full line */
155 if (!got_full_line)
156 while ((c = getchar()) != EOF && c != '\n')
157 ;
158 } else
159 /* we could not read, return the
160 * default answer which is no */
161 return 0;
162
163 if (tolower(answer[0]) == 'y' && !answer[1])
164 return 1;
165 if (!strncasecmp(answer, "yes", sizeof(answer)))
166 return 1;
167 if (tolower(answer[0]) == 'n' && !answer[1])
168 return 0;
169 if (!strncasecmp(answer, "no", sizeof(answer)))
170 return 0;
171
172 /* did not find an answer we understand */
173 return -1;
174 }
175
176 static int ask_yes_no_if_possible(const char *format, ...)
177 {
178 char question[4096];
179 const char *retry_hook[] = { NULL, NULL, NULL };
180 va_list args;
181
182 va_start(args, format);
183 vsnprintf(question, sizeof(question), format, args);
184 va_end(args);
185
186 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
187 retry_hook[1] = question;
188 return !run_command_v_opt(retry_hook, 0);
189 }
190
191 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
192 return 0;
193
194 while (1) {
195 int answer;
196 fprintf(stderr, "%s (y/n) ", question);
197
198 if ((answer = read_yes_no_answer()) >= 0)
199 return answer;
200
201 fprintf(stderr, "Sorry, I did not understand your answer. "
202 "Please type 'y' or 'n'\n");
203 }
204 }
205
206 /* Normalizes NT paths as returned by some low-level APIs. */
207 static wchar_t *normalize_ntpath(wchar_t *wbuf)
208 {
209 int i;
210 /* fix absolute path prefixes */
211 if (wbuf[0] == '\\') {
212 /* strip NT namespace prefixes */
213 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
214 !wcsncmp(wbuf, L"\\\\?\\", 4))
215 wbuf += 4;
216 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
217 wbuf += 12;
218 /* replace remaining '...UNC\' with '\\' */
219 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
220 wbuf += 2;
221 *wbuf = '\\';
222 }
223 }
224 /* convert backslashes to slashes */
225 for (i = 0; wbuf[i]; i++)
226 if (wbuf[i] == '\\')
227 wbuf[i] = '/';
228 return wbuf;
229 }
230
231 int mingw_unlink(const char *pathname)
232 {
233 int ret, tries = 0;
234 wchar_t wpathname[MAX_PATH];
235 if (xutftowcs_path(wpathname, pathname) < 0)
236 return -1;
237
238 /* read-only files cannot be removed */
239 _wchmod(wpathname, 0666);
240 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
241 if (!is_file_in_use_error(GetLastError()))
242 break;
243 /*
244 * We assume that some other process had the source or
245 * destination file open at the wrong moment and retry.
246 * In order to give the other process a higher chance to
247 * complete its operation, we give up our time slice now.
248 * If we have to retry again, we do sleep a bit.
249 */
250 Sleep(delay[tries]);
251 tries++;
252 }
253 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
254 ask_yes_no_if_possible("Unlink of file '%s' failed. "
255 "Should I try again?", pathname))
256 ret = _wunlink(wpathname);
257 return ret;
258 }
259
260 static int is_dir_empty(const wchar_t *wpath)
261 {
262 WIN32_FIND_DATAW findbuf;
263 HANDLE handle;
264 wchar_t wbuf[MAX_PATH + 2];
265 wcscpy(wbuf, wpath);
266 wcscat(wbuf, L"\\*");
267 handle = FindFirstFileW(wbuf, &findbuf);
268 if (handle == INVALID_HANDLE_VALUE)
269 return GetLastError() == ERROR_NO_MORE_FILES;
270
271 while (!wcscmp(findbuf.cFileName, L".") ||
272 !wcscmp(findbuf.cFileName, L".."))
273 if (!FindNextFileW(handle, &findbuf)) {
274 DWORD err = GetLastError();
275 FindClose(handle);
276 return err == ERROR_NO_MORE_FILES;
277 }
278 FindClose(handle);
279 return 0;
280 }
281
282 int mingw_rmdir(const char *pathname)
283 {
284 int ret, tries = 0;
285 wchar_t wpathname[MAX_PATH];
286 if (xutftowcs_path(wpathname, pathname) < 0)
287 return -1;
288
289 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
290 if (!is_file_in_use_error(GetLastError()))
291 errno = err_win_to_posix(GetLastError());
292 if (errno != EACCES)
293 break;
294 if (!is_dir_empty(wpathname)) {
295 errno = ENOTEMPTY;
296 break;
297 }
298 /*
299 * We assume that some other process had the source or
300 * destination file open at the wrong moment and retry.
301 * In order to give the other process a higher chance to
302 * complete its operation, we give up our time slice now.
303 * If we have to retry again, we do sleep a bit.
304 */
305 Sleep(delay[tries]);
306 tries++;
307 }
308 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
309 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
310 "Should I try again?", pathname))
311 ret = _wrmdir(wpathname);
312 return ret;
313 }
314
315 static inline int needs_hiding(const char *path)
316 {
317 const char *basename;
318
319 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
320 return 0;
321
322 /* We cannot use basename(), as it would remove trailing slashes */
323 mingw_skip_dos_drive_prefix((char **)&path);
324 if (!*path)
325 return 0;
326
327 for (basename = path; *path; path++)
328 if (is_dir_sep(*path)) {
329 do {
330 path++;
331 } while (is_dir_sep(*path));
332 /* ignore trailing slashes */
333 if (*path)
334 basename = path;
335 }
336
337 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
338 return *basename == '.';
339
340 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
341 return !strncasecmp(".git", basename, 4) &&
342 (!basename[4] || is_dir_sep(basename[4]));
343 }
344
345 static int set_hidden_flag(const wchar_t *path, int set)
346 {
347 DWORD original = GetFileAttributesW(path), modified;
348 if (set)
349 modified = original | FILE_ATTRIBUTE_HIDDEN;
350 else
351 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
352 if (original == modified || SetFileAttributesW(path, modified))
353 return 0;
354 errno = err_win_to_posix(GetLastError());
355 return -1;
356 }
357
358 int mingw_mkdir(const char *path, int mode)
359 {
360 int ret;
361 wchar_t wpath[MAX_PATH];
362 if (xutftowcs_path(wpath, path) < 0)
363 return -1;
364 ret = _wmkdir(wpath);
365 if (!ret && needs_hiding(path))
366 return set_hidden_flag(wpath, 1);
367 return ret;
368 }
369
370 /*
371 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
372 * is documented in [1] as opening a writable file handle in append mode.
373 * (It is believed that) this is atomic since it is maintained by the
374 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
375 *
376 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
377 *
378 * This trick does not appear to work for named pipes. Instead it creates
379 * a named pipe client handle that cannot be written to. Callers should
380 * just use the regular _wopen() for them. (And since client handle gets
381 * bound to a unique server handle, it isn't really an issue.)
382 */
383 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
384 {
385 HANDLE handle;
386 int fd;
387 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
388
389 /* only these flags are supported */
390 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
391 return errno = ENOSYS, -1;
392
393 /*
394 * FILE_SHARE_WRITE is required to permit child processes
395 * to append to the file.
396 */
397 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
398 FILE_SHARE_WRITE | FILE_SHARE_READ,
399 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
400 if (handle == INVALID_HANDLE_VALUE)
401 return errno = err_win_to_posix(GetLastError()), -1;
402
403 /*
404 * No O_APPEND here, because the CRT uses it only to reset the
405 * file pointer to EOF before each write(); but that is not
406 * necessary (and may lead to races) for a file created with
407 * FILE_APPEND_DATA.
408 */
409 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
410 if (fd < 0)
411 CloseHandle(handle);
412 return fd;
413 }
414
415 /*
416 * Does the pathname map to the local named pipe filesystem?
417 * That is, does it have a "//./pipe/" prefix?
418 */
419 static int is_local_named_pipe_path(const char *filename)
420 {
421 return (is_dir_sep(filename[0]) &&
422 is_dir_sep(filename[1]) &&
423 filename[2] == '.' &&
424 is_dir_sep(filename[3]) &&
425 !strncasecmp(filename+4, "pipe", 4) &&
426 is_dir_sep(filename[8]) &&
427 filename[9]);
428 }
429
430 int mingw_open (const char *filename, int oflags, ...)
431 {
432 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
433 va_list args;
434 unsigned mode;
435 int fd;
436 wchar_t wfilename[MAX_PATH];
437 open_fn_t open_fn;
438
439 va_start(args, oflags);
440 mode = va_arg(args, int);
441 va_end(args);
442
443 if (filename && !strcmp(filename, "/dev/null"))
444 filename = "nul";
445
446 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
447 open_fn = mingw_open_append;
448 else
449 open_fn = _wopen;
450
451 if (xutftowcs_path(wfilename, filename) < 0)
452 return -1;
453 fd = open_fn(wfilename, oflags, mode);
454
455 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
456 DWORD attrs = GetFileAttributesW(wfilename);
457 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
458 errno = EISDIR;
459 }
460 if ((oflags & O_CREAT) && needs_hiding(filename)) {
461 /*
462 * Internally, _wopen() uses the CreateFile() API which errors
463 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
464 * specified and an already existing file's attributes do not
465 * match *exactly*. As there is no mode or flag we can set that
466 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
467 * again *without* the O_CREAT flag (that corresponds to the
468 * CREATE_ALWAYS flag of CreateFile()).
469 */
470 if (fd < 0 && errno == EACCES)
471 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
472 if (fd >= 0 && set_hidden_flag(wfilename, 1))
473 warning("could not mark '%s' as hidden.", filename);
474 }
475 return fd;
476 }
477
478 static BOOL WINAPI ctrl_ignore(DWORD type)
479 {
480 return TRUE;
481 }
482
483 #undef fgetc
484 int mingw_fgetc(FILE *stream)
485 {
486 int ch;
487 if (!isatty(_fileno(stream)))
488 return fgetc(stream);
489
490 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
491 while (1) {
492 ch = fgetc(stream);
493 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
494 break;
495
496 /* Ctrl+C was pressed, simulate SIGINT and retry */
497 mingw_raise(SIGINT);
498 }
499 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
500 return ch;
501 }
502
503 #undef fopen
504 FILE *mingw_fopen (const char *filename, const char *otype)
505 {
506 int hide = needs_hiding(filename);
507 FILE *file;
508 wchar_t wfilename[MAX_PATH], wotype[4];
509 if (filename && !strcmp(filename, "/dev/null"))
510 filename = "nul";
511 if (xutftowcs_path(wfilename, filename) < 0 ||
512 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
513 return NULL;
514 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
515 error("could not unhide %s", filename);
516 return NULL;
517 }
518 file = _wfopen(wfilename, wotype);
519 if (!file && GetLastError() == ERROR_INVALID_NAME)
520 errno = ENOENT;
521 if (file && hide && set_hidden_flag(wfilename, 1))
522 warning("could not mark '%s' as hidden.", filename);
523 return file;
524 }
525
526 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
527 {
528 int hide = needs_hiding(filename);
529 FILE *file;
530 wchar_t wfilename[MAX_PATH], wotype[4];
531 if (filename && !strcmp(filename, "/dev/null"))
532 filename = "nul";
533 if (xutftowcs_path(wfilename, filename) < 0 ||
534 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
535 return NULL;
536 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
537 error("could not unhide %s", filename);
538 return NULL;
539 }
540 file = _wfreopen(wfilename, wotype, stream);
541 if (file && hide && set_hidden_flag(wfilename, 1))
542 warning("could not mark '%s' as hidden.", filename);
543 return file;
544 }
545
546 #undef fflush
547 int mingw_fflush(FILE *stream)
548 {
549 int ret = fflush(stream);
550
551 /*
552 * write() is used behind the scenes of stdio output functions.
553 * Since git code does not check for errors after each stdio write
554 * operation, it can happen that write() is called by a later
555 * stdio function even if an earlier write() call failed. In the
556 * case of a pipe whose readable end was closed, only the first
557 * call to write() reports EPIPE on Windows. Subsequent write()
558 * calls report EINVAL. It is impossible to notice whether this
559 * fflush invocation triggered such a case, therefore, we have to
560 * catch all EINVAL errors whole-sale.
561 */
562 if (ret && errno == EINVAL)
563 errno = EPIPE;
564
565 return ret;
566 }
567
568 #undef write
569 ssize_t mingw_write(int fd, const void *buf, size_t len)
570 {
571 ssize_t result = write(fd, buf, len);
572
573 if (result < 0 && errno == EINVAL && buf) {
574 /* check if fd is a pipe */
575 HANDLE h = (HANDLE) _get_osfhandle(fd);
576 if (GetFileType(h) == FILE_TYPE_PIPE)
577 errno = EPIPE;
578 else
579 errno = EINVAL;
580 }
581
582 return result;
583 }
584
585 int mingw_access(const char *filename, int mode)
586 {
587 wchar_t wfilename[MAX_PATH];
588 if (xutftowcs_path(wfilename, filename) < 0)
589 return -1;
590 /* X_OK is not supported by the MSVCRT version */
591 return _waccess(wfilename, mode & ~X_OK);
592 }
593
594 int mingw_chdir(const char *dirname)
595 {
596 wchar_t wdirname[MAX_PATH];
597 if (xutftowcs_path(wdirname, dirname) < 0)
598 return -1;
599 return _wchdir(wdirname);
600 }
601
602 int mingw_chmod(const char *filename, int mode)
603 {
604 wchar_t wfilename[MAX_PATH];
605 if (xutftowcs_path(wfilename, filename) < 0)
606 return -1;
607 return _wchmod(wfilename, mode);
608 }
609
610 /*
611 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
612 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
613 */
614 static inline long long filetime_to_hnsec(const FILETIME *ft)
615 {
616 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
617 /* Windows to Unix Epoch conversion */
618 return winTime - 116444736000000000LL;
619 }
620
621 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
622 {
623 long long hnsec = filetime_to_hnsec(ft);
624 ts->tv_sec = (time_t)(hnsec / 10000000);
625 ts->tv_nsec = (hnsec % 10000000) * 100;
626 }
627
628 /**
629 * Verifies that safe_create_leading_directories() would succeed.
630 */
631 static int has_valid_directory_prefix(wchar_t *wfilename)
632 {
633 int n = wcslen(wfilename);
634
635 while (n > 0) {
636 wchar_t c = wfilename[--n];
637 DWORD attributes;
638
639 if (!is_dir_sep(c))
640 continue;
641
642 wfilename[n] = L'\0';
643 attributes = GetFileAttributesW(wfilename);
644 wfilename[n] = c;
645 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
646 attributes == FILE_ATTRIBUTE_DEVICE)
647 return 1;
648 if (attributes == INVALID_FILE_ATTRIBUTES)
649 switch (GetLastError()) {
650 case ERROR_PATH_NOT_FOUND:
651 continue;
652 case ERROR_FILE_NOT_FOUND:
653 /* This implies parent directory exists. */
654 return 1;
655 }
656 return 0;
657 }
658 return 1;
659 }
660
661 /* We keep the do_lstat code in a separate function to avoid recursion.
662 * When a path ends with a slash, the stat will fail with ENOENT. In
663 * this case, we strip the trailing slashes and stat again.
664 *
665 * If follow is true then act like stat() and report on the link
666 * target. Otherwise report on the link itself.
667 */
668 static int do_lstat(int follow, const char *file_name, struct stat *buf)
669 {
670 WIN32_FILE_ATTRIBUTE_DATA fdata;
671 wchar_t wfilename[MAX_PATH];
672 if (xutftowcs_path(wfilename, file_name) < 0)
673 return -1;
674
675 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
676 buf->st_ino = 0;
677 buf->st_gid = 0;
678 buf->st_uid = 0;
679 buf->st_nlink = 1;
680 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
681 buf->st_size = fdata.nFileSizeLow |
682 (((off_t)fdata.nFileSizeHigh)<<32);
683 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
684 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
685 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
686 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
687 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
688 WIN32_FIND_DATAW findbuf;
689 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
690 if (handle != INVALID_HANDLE_VALUE) {
691 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
692 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
693 if (follow) {
694 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
695 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
696 } else {
697 buf->st_mode = S_IFLNK;
698 }
699 buf->st_mode |= S_IREAD;
700 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
701 buf->st_mode |= S_IWRITE;
702 }
703 FindClose(handle);
704 }
705 }
706 return 0;
707 }
708 switch (GetLastError()) {
709 case ERROR_ACCESS_DENIED:
710 case ERROR_SHARING_VIOLATION:
711 case ERROR_LOCK_VIOLATION:
712 case ERROR_SHARING_BUFFER_EXCEEDED:
713 errno = EACCES;
714 break;
715 case ERROR_BUFFER_OVERFLOW:
716 errno = ENAMETOOLONG;
717 break;
718 case ERROR_NOT_ENOUGH_MEMORY:
719 errno = ENOMEM;
720 break;
721 case ERROR_PATH_NOT_FOUND:
722 if (!has_valid_directory_prefix(wfilename)) {
723 errno = ENOTDIR;
724 break;
725 }
726 /* fallthru */
727 default:
728 errno = ENOENT;
729 break;
730 }
731 return -1;
732 }
733
734 /* We provide our own lstat/fstat functions, since the provided
735 * lstat/fstat functions are so slow. These stat functions are
736 * tailored for Git's usage (read: fast), and are not meant to be
737 * complete. Note that Git stat()s are redirected to mingw_lstat()
738 * too, since Windows doesn't really handle symlinks that well.
739 */
740 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
741 {
742 int namelen;
743 char alt_name[PATH_MAX];
744
745 if (!do_lstat(follow, file_name, buf))
746 return 0;
747
748 /* if file_name ended in a '/', Windows returned ENOENT;
749 * try again without trailing slashes
750 */
751 if (errno != ENOENT)
752 return -1;
753
754 namelen = strlen(file_name);
755 if (namelen && file_name[namelen-1] != '/')
756 return -1;
757 while (namelen && file_name[namelen-1] == '/')
758 --namelen;
759 if (!namelen || namelen >= PATH_MAX)
760 return -1;
761
762 memcpy(alt_name, file_name, namelen);
763 alt_name[namelen] = 0;
764 return do_lstat(follow, alt_name, buf);
765 }
766
767 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
768 {
769 BY_HANDLE_FILE_INFORMATION fdata;
770
771 if (!GetFileInformationByHandle(hnd, &fdata)) {
772 errno = err_win_to_posix(GetLastError());
773 return -1;
774 }
775
776 buf->st_ino = 0;
777 buf->st_gid = 0;
778 buf->st_uid = 0;
779 buf->st_nlink = 1;
780 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
781 buf->st_size = fdata.nFileSizeLow |
782 (((off_t)fdata.nFileSizeHigh)<<32);
783 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
784 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
785 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
786 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
787 return 0;
788 }
789
790 int mingw_lstat(const char *file_name, struct stat *buf)
791 {
792 return do_stat_internal(0, file_name, buf);
793 }
794 int mingw_stat(const char *file_name, struct stat *buf)
795 {
796 return do_stat_internal(1, file_name, buf);
797 }
798
799 int mingw_fstat(int fd, struct stat *buf)
800 {
801 HANDLE fh = (HANDLE)_get_osfhandle(fd);
802 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
803
804 switch (type) {
805 case FILE_TYPE_DISK:
806 return get_file_info_by_handle(fh, buf);
807
808 case FILE_TYPE_CHAR:
809 case FILE_TYPE_PIPE:
810 /* initialize stat fields */
811 memset(buf, 0, sizeof(*buf));
812 buf->st_nlink = 1;
813
814 if (type == FILE_TYPE_CHAR) {
815 buf->st_mode = _S_IFCHR;
816 } else {
817 buf->st_mode = _S_IFIFO;
818 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
819 buf->st_size = avail;
820 }
821 return 0;
822
823 default:
824 errno = EBADF;
825 return -1;
826 }
827 }
828
829 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
830 {
831 long long winTime = t * 10000000LL + 116444736000000000LL;
832 ft->dwLowDateTime = winTime;
833 ft->dwHighDateTime = winTime >> 32;
834 }
835
836 int mingw_utime (const char *file_name, const struct utimbuf *times)
837 {
838 FILETIME mft, aft;
839 int fh, rc;
840 DWORD attrs;
841 wchar_t wfilename[MAX_PATH];
842 if (xutftowcs_path(wfilename, file_name) < 0)
843 return -1;
844
845 /* must have write permission */
846 attrs = GetFileAttributesW(wfilename);
847 if (attrs != INVALID_FILE_ATTRIBUTES &&
848 (attrs & FILE_ATTRIBUTE_READONLY)) {
849 /* ignore errors here; open() will report them */
850 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
851 }
852
853 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
854 rc = -1;
855 goto revert_attrs;
856 }
857
858 if (times) {
859 time_t_to_filetime(times->modtime, &mft);
860 time_t_to_filetime(times->actime, &aft);
861 } else {
862 GetSystemTimeAsFileTime(&mft);
863 aft = mft;
864 }
865 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
866 errno = EINVAL;
867 rc = -1;
868 } else
869 rc = 0;
870 close(fh);
871
872 revert_attrs:
873 if (attrs != INVALID_FILE_ATTRIBUTES &&
874 (attrs & FILE_ATTRIBUTE_READONLY)) {
875 /* ignore errors again */
876 SetFileAttributesW(wfilename, attrs);
877 }
878 return rc;
879 }
880
881 #undef strftime
882 size_t mingw_strftime(char *s, size_t max,
883 const char *format, const struct tm *tm)
884 {
885 size_t ret = strftime(s, max, format, tm);
886
887 if (!ret && errno == EINVAL)
888 die("invalid strftime format: '%s'", format);
889 return ret;
890 }
891
892 unsigned int sleep (unsigned int seconds)
893 {
894 Sleep(seconds*1000);
895 return 0;
896 }
897
898 char *mingw_mktemp(char *template)
899 {
900 wchar_t wtemplate[MAX_PATH];
901 if (xutftowcs_path(wtemplate, template) < 0)
902 return NULL;
903 if (!_wmktemp(wtemplate))
904 return NULL;
905 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
906 return NULL;
907 return template;
908 }
909
910 int mkstemp(char *template)
911 {
912 char *filename = mktemp(template);
913 if (filename == NULL)
914 return -1;
915 return open(filename, O_RDWR | O_CREAT, 0600);
916 }
917
918 int gettimeofday(struct timeval *tv, void *tz)
919 {
920 FILETIME ft;
921 long long hnsec;
922
923 GetSystemTimeAsFileTime(&ft);
924 hnsec = filetime_to_hnsec(&ft);
925 tv->tv_sec = hnsec / 10000000;
926 tv->tv_usec = (hnsec % 10000000) / 10;
927 return 0;
928 }
929
930 int pipe(int filedes[2])
931 {
932 HANDLE h[2];
933
934 /* this creates non-inheritable handles */
935 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
936 errno = err_win_to_posix(GetLastError());
937 return -1;
938 }
939 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
940 if (filedes[0] < 0) {
941 CloseHandle(h[0]);
942 CloseHandle(h[1]);
943 return -1;
944 }
945 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
946 if (filedes[1] < 0) {
947 close(filedes[0]);
948 CloseHandle(h[1]);
949 return -1;
950 }
951 return 0;
952 }
953
954 struct tm *gmtime_r(const time_t *timep, struct tm *result)
955 {
956 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
957 memcpy(result, gmtime(timep), sizeof(struct tm));
958 return result;
959 }
960
961 struct tm *localtime_r(const time_t *timep, struct tm *result)
962 {
963 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
964 memcpy(result, localtime(timep), sizeof(struct tm));
965 return result;
966 }
967
968 char *mingw_getcwd(char *pointer, int len)
969 {
970 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
971 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
972
973 if (!ret || ret >= ARRAY_SIZE(cwd)) {
974 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
975 return NULL;
976 }
977 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
978 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
979 HANDLE hnd = CreateFileW(cwd, 0,
980 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
981 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
982 if (hnd == INVALID_HANDLE_VALUE)
983 return NULL;
984 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
985 CloseHandle(hnd);
986 if (!ret || ret >= ARRAY_SIZE(wpointer))
987 return NULL;
988 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
989 return NULL;
990 return pointer;
991 }
992 if (!ret || ret >= ARRAY_SIZE(wpointer))
993 return NULL;
994 if (xwcstoutf(pointer, wpointer, len) < 0)
995 return NULL;
996 convert_slashes(pointer);
997 return pointer;
998 }
999
1000 /*
1001 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
1002 * (Parsing C++ Command-Line Arguments)
1003 */
1004 static const char *quote_arg(const char *arg)
1005 {
1006 /* count chars to quote */
1007 int len = 0, n = 0;
1008 int force_quotes = 0;
1009 char *q, *d;
1010 const char *p = arg;
1011 if (!*p) force_quotes = 1;
1012 while (*p) {
1013 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1014 force_quotes = 1;
1015 else if (*p == '"')
1016 n++;
1017 else if (*p == '\\') {
1018 int count = 0;
1019 while (*p == '\\') {
1020 count++;
1021 p++;
1022 len++;
1023 }
1024 if (*p == '"')
1025 n += count*2 + 1;
1026 continue;
1027 }
1028 len++;
1029 p++;
1030 }
1031 if (!force_quotes && n == 0)
1032 return arg;
1033
1034 /* insert \ where necessary */
1035 d = q = xmalloc(st_add3(len, n, 3));
1036 *d++ = '"';
1037 while (*arg) {
1038 if (*arg == '"')
1039 *d++ = '\\';
1040 else if (*arg == '\\') {
1041 int count = 0;
1042 while (*arg == '\\') {
1043 count++;
1044 *d++ = *arg++;
1045 }
1046 if (*arg == '"') {
1047 while (count-- > 0)
1048 *d++ = '\\';
1049 *d++ = '\\';
1050 }
1051 }
1052 *d++ = *arg++;
1053 }
1054 *d++ = '"';
1055 *d++ = 0;
1056 return q;
1057 }
1058
1059 static const char *parse_interpreter(const char *cmd)
1060 {
1061 static char buf[100];
1062 char *p, *opt;
1063 int n, fd;
1064
1065 /* don't even try a .exe */
1066 n = strlen(cmd);
1067 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1068 return NULL;
1069
1070 fd = open(cmd, O_RDONLY);
1071 if (fd < 0)
1072 return NULL;
1073 n = read(fd, buf, sizeof(buf)-1);
1074 close(fd);
1075 if (n < 4) /* at least '#!/x' and not error */
1076 return NULL;
1077
1078 if (buf[0] != '#' || buf[1] != '!')
1079 return NULL;
1080 buf[n] = '\0';
1081 p = buf + strcspn(buf, "\r\n");
1082 if (!*p)
1083 return NULL;
1084
1085 *p = '\0';
1086 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1087 return NULL;
1088 /* strip options */
1089 if ((opt = strchr(p+1, ' ')))
1090 *opt = '\0';
1091 return p+1;
1092 }
1093
1094 /*
1095 * exe_only means that we only want to detect .exe files, but not scripts
1096 * (which do not have an extension)
1097 */
1098 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1099 int isexe, int exe_only)
1100 {
1101 char path[MAX_PATH];
1102 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1103
1104 if (!isexe && access(path, F_OK) == 0)
1105 return xstrdup(path);
1106 path[strlen(path)-4] = '\0';
1107 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1108 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1109 return xstrdup(path);
1110 return NULL;
1111 }
1112
1113 /*
1114 * Determines the absolute path of cmd using the split path in path.
1115 * If cmd contains a slash or backslash, no lookup is performed.
1116 */
1117 static char *path_lookup(const char *cmd, int exe_only)
1118 {
1119 const char *path;
1120 char *prog = NULL;
1121 int len = strlen(cmd);
1122 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1123
1124 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1125 return xstrdup(cmd);
1126
1127 path = mingw_getenv("PATH");
1128 if (!path)
1129 return NULL;
1130
1131 while (!prog) {
1132 const char *sep = strchrnul(path, ';');
1133 int dirlen = sep - path;
1134 if (dirlen)
1135 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1136 if (!*sep)
1137 break;
1138 path = sep + 1;
1139 }
1140
1141 return prog;
1142 }
1143
1144 static int do_putenv(char **env, const char *name, int size, int free_old);
1145
1146 /* used number of elements of environ array, including terminating NULL */
1147 static int environ_size = 0;
1148 /* allocated size of environ array, in bytes */
1149 static int environ_alloc = 0;
1150
1151 /*
1152 * Create environment block suitable for CreateProcess. Merges current
1153 * process environment and the supplied environment changes.
1154 */
1155 static wchar_t *make_environment_block(char **deltaenv)
1156 {
1157 wchar_t *wenvblk = NULL;
1158 char **tmpenv;
1159 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1160
1161 while (deltaenv && deltaenv[i])
1162 i++;
1163
1164 /* copy the environment, leaving space for changes */
1165 ALLOC_ARRAY(tmpenv, size + i);
1166 memcpy(tmpenv, environ, size * sizeof(char*));
1167
1168 /* merge supplied environment changes into the temporary environment */
1169 for (i = 0; deltaenv && deltaenv[i]; i++)
1170 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1171
1172 /* create environment block from temporary environment */
1173 for (i = 0; tmpenv[i]; i++) {
1174 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1175 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1176 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1177 }
1178 /* add final \0 terminator */
1179 wenvblk[wenvpos] = 0;
1180 free(tmpenv);
1181 return wenvblk;
1182 }
1183
1184 struct pinfo_t {
1185 struct pinfo_t *next;
1186 pid_t pid;
1187 HANDLE proc;
1188 };
1189 static struct pinfo_t *pinfo = NULL;
1190 CRITICAL_SECTION pinfo_cs;
1191
1192 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1193 const char *dir,
1194 int prepend_cmd, int fhin, int fhout, int fherr)
1195 {
1196 STARTUPINFOW si;
1197 PROCESS_INFORMATION pi;
1198 struct strbuf args;
1199 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1200 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1201 BOOL ret;
1202
1203 /* Determine whether or not we are associated to a console */
1204 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1205 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1206 FILE_ATTRIBUTE_NORMAL, NULL);
1207 if (cons == INVALID_HANDLE_VALUE) {
1208 /* There is no console associated with this process.
1209 * Since the child is a console process, Windows
1210 * would normally create a console window. But
1211 * since we'll be redirecting std streams, we do
1212 * not need the console.
1213 * It is necessary to use DETACHED_PROCESS
1214 * instead of CREATE_NO_WINDOW to make ssh
1215 * recognize that it has no console.
1216 */
1217 flags |= DETACHED_PROCESS;
1218 } else {
1219 /* There is already a console. If we specified
1220 * DETACHED_PROCESS here, too, Windows would
1221 * disassociate the child from the console.
1222 * The same is true for CREATE_NO_WINDOW.
1223 * Go figure!
1224 */
1225 CloseHandle(cons);
1226 }
1227 memset(&si, 0, sizeof(si));
1228 si.cb = sizeof(si);
1229 si.dwFlags = STARTF_USESTDHANDLES;
1230 si.hStdInput = winansi_get_osfhandle(fhin);
1231 si.hStdOutput = winansi_get_osfhandle(fhout);
1232 si.hStdError = winansi_get_osfhandle(fherr);
1233
1234 if (xutftowcs_path(wcmd, cmd) < 0)
1235 return -1;
1236 if (dir && xutftowcs_path(wdir, dir) < 0)
1237 return -1;
1238
1239 /* concatenate argv, quoting args as we go */
1240 strbuf_init(&args, 0);
1241 if (prepend_cmd) {
1242 char *quoted = (char *)quote_arg(cmd);
1243 strbuf_addstr(&args, quoted);
1244 if (quoted != cmd)
1245 free(quoted);
1246 }
1247 for (; *argv; argv++) {
1248 char *quoted = (char *)quote_arg(*argv);
1249 if (*args.buf)
1250 strbuf_addch(&args, ' ');
1251 strbuf_addstr(&args, quoted);
1252 if (quoted != *argv)
1253 free(quoted);
1254 }
1255
1256 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1257 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1258 strbuf_release(&args);
1259
1260 wenvblk = make_environment_block(deltaenv);
1261
1262 memset(&pi, 0, sizeof(pi));
1263 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1264 wenvblk, dir ? wdir : NULL, &si, &pi);
1265
1266 free(wenvblk);
1267 free(wargs);
1268
1269 if (!ret) {
1270 errno = ENOENT;
1271 return -1;
1272 }
1273 CloseHandle(pi.hThread);
1274
1275 /*
1276 * The process ID is the human-readable identifier of the process
1277 * that we want to present in log and error messages. The handle
1278 * is not useful for this purpose. But we cannot close it, either,
1279 * because it is not possible to turn a process ID into a process
1280 * handle after the process terminated.
1281 * Keep the handle in a list for waitpid.
1282 */
1283 EnterCriticalSection(&pinfo_cs);
1284 {
1285 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1286 info->pid = pi.dwProcessId;
1287 info->proc = pi.hProcess;
1288 info->next = pinfo;
1289 pinfo = info;
1290 }
1291 LeaveCriticalSection(&pinfo_cs);
1292
1293 return (pid_t)pi.dwProcessId;
1294 }
1295
1296 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1297 {
1298 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1299 }
1300
1301 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1302 const char *dir,
1303 int fhin, int fhout, int fherr)
1304 {
1305 pid_t pid;
1306 char *prog = path_lookup(cmd, 0);
1307
1308 if (!prog) {
1309 errno = ENOENT;
1310 pid = -1;
1311 }
1312 else {
1313 const char *interpr = parse_interpreter(prog);
1314
1315 if (interpr) {
1316 const char *argv0 = argv[0];
1317 char *iprog = path_lookup(interpr, 1);
1318 argv[0] = prog;
1319 if (!iprog) {
1320 errno = ENOENT;
1321 pid = -1;
1322 }
1323 else {
1324 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1325 fhin, fhout, fherr);
1326 free(iprog);
1327 }
1328 argv[0] = argv0;
1329 }
1330 else
1331 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1332 fhin, fhout, fherr);
1333 free(prog);
1334 }
1335 return pid;
1336 }
1337
1338 static int try_shell_exec(const char *cmd, char *const *argv)
1339 {
1340 const char *interpr = parse_interpreter(cmd);
1341 char *prog;
1342 int pid = 0;
1343
1344 if (!interpr)
1345 return 0;
1346 prog = path_lookup(interpr, 1);
1347 if (prog) {
1348 int argc = 0;
1349 const char **argv2;
1350 while (argv[argc]) argc++;
1351 ALLOC_ARRAY(argv2, argc + 1);
1352 argv2[0] = (char *)cmd; /* full path to the script file */
1353 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1354 pid = mingw_spawnv(prog, argv2, 1);
1355 if (pid >= 0) {
1356 int status;
1357 if (waitpid(pid, &status, 0) < 0)
1358 status = 255;
1359 exit(status);
1360 }
1361 pid = 1; /* indicate that we tried but failed */
1362 free(prog);
1363 free(argv2);
1364 }
1365 return pid;
1366 }
1367
1368 int mingw_execv(const char *cmd, char *const *argv)
1369 {
1370 /* check if git_command is a shell script */
1371 if (!try_shell_exec(cmd, argv)) {
1372 int pid, status;
1373
1374 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1375 if (pid < 0)
1376 return -1;
1377 if (waitpid(pid, &status, 0) < 0)
1378 status = 255;
1379 exit(status);
1380 }
1381 return -1;
1382 }
1383
1384 int mingw_execvp(const char *cmd, char *const *argv)
1385 {
1386 char *prog = path_lookup(cmd, 0);
1387
1388 if (prog) {
1389 mingw_execv(prog, argv);
1390 free(prog);
1391 } else
1392 errno = ENOENT;
1393
1394 return -1;
1395 }
1396
1397 int mingw_kill(pid_t pid, int sig)
1398 {
1399 if (pid > 0 && sig == SIGTERM) {
1400 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1401
1402 if (TerminateProcess(h, -1)) {
1403 CloseHandle(h);
1404 return 0;
1405 }
1406
1407 errno = err_win_to_posix(GetLastError());
1408 CloseHandle(h);
1409 return -1;
1410 } else if (pid > 0 && sig == 0) {
1411 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1412 if (h) {
1413 CloseHandle(h);
1414 return 0;
1415 }
1416 }
1417
1418 errno = EINVAL;
1419 return -1;
1420 }
1421
1422 /*
1423 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1424 */
1425 static int compareenv(const void *v1, const void *v2)
1426 {
1427 const char *e1 = *(const char**)v1;
1428 const char *e2 = *(const char**)v2;
1429
1430 for (;;) {
1431 int c1 = *e1++;
1432 int c2 = *e2++;
1433 c1 = (c1 == '=') ? 0 : tolower(c1);
1434 c2 = (c2 == '=') ? 0 : tolower(c2);
1435 if (c1 > c2)
1436 return 1;
1437 if (c1 < c2)
1438 return -1;
1439 if (c1 == 0)
1440 return 0;
1441 }
1442 }
1443
1444 static int bsearchenv(char **env, const char *name, size_t size)
1445 {
1446 unsigned low = 0, high = size;
1447 while (low < high) {
1448 unsigned mid = low + ((high - low) >> 1);
1449 int cmp = compareenv(&env[mid], &name);
1450 if (cmp < 0)
1451 low = mid + 1;
1452 else if (cmp > 0)
1453 high = mid;
1454 else
1455 return mid;
1456 }
1457 return ~low; /* not found, return 1's complement of insert position */
1458 }
1459
1460 /*
1461 * If name contains '=', then sets the variable, otherwise it unsets it
1462 * Size includes the terminating NULL. Env must have room for size + 1 entries
1463 * (in case of insert). Returns the new size. Optionally frees removed entries.
1464 */
1465 static int do_putenv(char **env, const char *name, int size, int free_old)
1466 {
1467 int i = bsearchenv(env, name, size - 1);
1468
1469 /* optionally free removed / replaced entry */
1470 if (i >= 0 && free_old)
1471 free(env[i]);
1472
1473 if (strchr(name, '=')) {
1474 /* if new value ('key=value') is specified, insert or replace entry */
1475 if (i < 0) {
1476 i = ~i;
1477 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1478 size++;
1479 }
1480 env[i] = (char*) name;
1481 } else if (i >= 0) {
1482 /* otherwise ('key') remove existing entry */
1483 size--;
1484 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1485 }
1486 return size;
1487 }
1488
1489 char *mingw_getenv(const char *name)
1490 {
1491 char *value;
1492 int pos = bsearchenv(environ, name, environ_size - 1);
1493 if (pos < 0)
1494 return NULL;
1495 value = strchr(environ[pos], '=');
1496 return value ? &value[1] : NULL;
1497 }
1498
1499 int mingw_putenv(const char *namevalue)
1500 {
1501 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1502 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1503 return 0;
1504 }
1505
1506 /*
1507 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1508 * that service contains a numerical port, or that it is null. It
1509 * does a simple search using gethostbyname, and returns one IPv4 host
1510 * if one was found.
1511 */
1512 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1513 const struct addrinfo *hints,
1514 struct addrinfo **res)
1515 {
1516 struct hostent *h = NULL;
1517 struct addrinfo *ai;
1518 struct sockaddr_in *sin;
1519
1520 if (node) {
1521 h = gethostbyname(node);
1522 if (!h)
1523 return WSAGetLastError();
1524 }
1525
1526 ai = xmalloc(sizeof(struct addrinfo));
1527 *res = ai;
1528 ai->ai_flags = 0;
1529 ai->ai_family = AF_INET;
1530 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1531 switch (ai->ai_socktype) {
1532 case SOCK_STREAM:
1533 ai->ai_protocol = IPPROTO_TCP;
1534 break;
1535 case SOCK_DGRAM:
1536 ai->ai_protocol = IPPROTO_UDP;
1537 break;
1538 default:
1539 ai->ai_protocol = 0;
1540 break;
1541 }
1542 ai->ai_addrlen = sizeof(struct sockaddr_in);
1543 if (hints && (hints->ai_flags & AI_CANONNAME))
1544 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1545 else
1546 ai->ai_canonname = NULL;
1547
1548 sin = xcalloc(1, ai->ai_addrlen);
1549 sin->sin_family = AF_INET;
1550 /* Note: getaddrinfo is supposed to allow service to be a string,
1551 * which should be looked up using getservbyname. This is
1552 * currently not implemented */
1553 if (service)
1554 sin->sin_port = htons(atoi(service));
1555 if (h)
1556 sin->sin_addr = *(struct in_addr *)h->h_addr;
1557 else if (hints && (hints->ai_flags & AI_PASSIVE))
1558 sin->sin_addr.s_addr = INADDR_ANY;
1559 else
1560 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1561 ai->ai_addr = (struct sockaddr *)sin;
1562 ai->ai_next = NULL;
1563 return 0;
1564 }
1565
1566 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1567 {
1568 free(res->ai_canonname);
1569 free(res->ai_addr);
1570 free(res);
1571 }
1572
1573 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1574 char *host, DWORD hostlen,
1575 char *serv, DWORD servlen, int flags)
1576 {
1577 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1578 if (sa->sa_family != AF_INET)
1579 return EAI_FAMILY;
1580 if (!host && !serv)
1581 return EAI_NONAME;
1582
1583 if (host && hostlen > 0) {
1584 struct hostent *ent = NULL;
1585 if (!(flags & NI_NUMERICHOST))
1586 ent = gethostbyaddr((const char *)&sin->sin_addr,
1587 sizeof(sin->sin_addr), AF_INET);
1588
1589 if (ent)
1590 snprintf(host, hostlen, "%s", ent->h_name);
1591 else if (flags & NI_NAMEREQD)
1592 return EAI_NONAME;
1593 else
1594 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1595 }
1596
1597 if (serv && servlen > 0) {
1598 struct servent *ent = NULL;
1599 if (!(flags & NI_NUMERICSERV))
1600 ent = getservbyport(sin->sin_port,
1601 flags & NI_DGRAM ? "udp" : "tcp");
1602
1603 if (ent)
1604 snprintf(serv, servlen, "%s", ent->s_name);
1605 else
1606 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1607 }
1608
1609 return 0;
1610 }
1611
1612 static HMODULE ipv6_dll = NULL;
1613 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1614 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1615 const struct addrinfo *hints,
1616 struct addrinfo **res);
1617 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1618 char *host, DWORD hostlen,
1619 char *serv, DWORD servlen, int flags);
1620 /*
1621 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1622 * don't need to try to load that one dynamically.
1623 */
1624
1625 static void socket_cleanup(void)
1626 {
1627 WSACleanup();
1628 if (ipv6_dll)
1629 FreeLibrary(ipv6_dll);
1630 ipv6_dll = NULL;
1631 ipv6_freeaddrinfo = freeaddrinfo_stub;
1632 ipv6_getaddrinfo = getaddrinfo_stub;
1633 ipv6_getnameinfo = getnameinfo_stub;
1634 }
1635
1636 static void ensure_socket_initialization(void)
1637 {
1638 WSADATA wsa;
1639 static int initialized = 0;
1640 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1641 const char **name;
1642
1643 if (initialized)
1644 return;
1645
1646 if (WSAStartup(MAKEWORD(2,2), &wsa))
1647 die("unable to initialize winsock subsystem, error %d",
1648 WSAGetLastError());
1649
1650 for (name = libraries; *name; name++) {
1651 ipv6_dll = LoadLibraryExA(*name, NULL,
1652 LOAD_LIBRARY_SEARCH_SYSTEM32);
1653 if (!ipv6_dll)
1654 continue;
1655
1656 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1657 GetProcAddress(ipv6_dll, "freeaddrinfo");
1658 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1659 const struct addrinfo *,
1660 struct addrinfo **))
1661 GetProcAddress(ipv6_dll, "getaddrinfo");
1662 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1663 socklen_t, char *, DWORD,
1664 char *, DWORD, int))
1665 GetProcAddress(ipv6_dll, "getnameinfo");
1666 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1667 FreeLibrary(ipv6_dll);
1668 ipv6_dll = NULL;
1669 } else
1670 break;
1671 }
1672 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1673 ipv6_freeaddrinfo = freeaddrinfo_stub;
1674 ipv6_getaddrinfo = getaddrinfo_stub;
1675 ipv6_getnameinfo = getnameinfo_stub;
1676 }
1677
1678 atexit(socket_cleanup);
1679 initialized = 1;
1680 }
1681
1682 #undef gethostname
1683 int mingw_gethostname(char *name, int namelen)
1684 {
1685 ensure_socket_initialization();
1686 return gethostname(name, namelen);
1687 }
1688
1689 #undef gethostbyname
1690 struct hostent *mingw_gethostbyname(const char *host)
1691 {
1692 ensure_socket_initialization();
1693 return gethostbyname(host);
1694 }
1695
1696 void mingw_freeaddrinfo(struct addrinfo *res)
1697 {
1698 ipv6_freeaddrinfo(res);
1699 }
1700
1701 int mingw_getaddrinfo(const char *node, const char *service,
1702 const struct addrinfo *hints, struct addrinfo **res)
1703 {
1704 ensure_socket_initialization();
1705 return ipv6_getaddrinfo(node, service, hints, res);
1706 }
1707
1708 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1709 char *host, DWORD hostlen, char *serv, DWORD servlen,
1710 int flags)
1711 {
1712 ensure_socket_initialization();
1713 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1714 }
1715
1716 int mingw_socket(int domain, int type, int protocol)
1717 {
1718 int sockfd;
1719 SOCKET s;
1720
1721 ensure_socket_initialization();
1722 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1723 if (s == INVALID_SOCKET) {
1724 /*
1725 * WSAGetLastError() values are regular BSD error codes
1726 * biased by WSABASEERR.
1727 * However, strerror() does not know about networking
1728 * specific errors, which are values beginning at 38 or so.
1729 * Therefore, we choose to leave the biased error code
1730 * in errno so that _if_ someone looks up the code somewhere,
1731 * then it is at least the number that are usually listed.
1732 */
1733 errno = WSAGetLastError();
1734 return -1;
1735 }
1736 /* convert into a file descriptor */
1737 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1738 closesocket(s);
1739 return error("unable to make a socket file descriptor: %s",
1740 strerror(errno));
1741 }
1742 return sockfd;
1743 }
1744
1745 #undef connect
1746 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1747 {
1748 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1749 return connect(s, sa, sz);
1750 }
1751
1752 #undef bind
1753 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1754 {
1755 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1756 return bind(s, sa, sz);
1757 }
1758
1759 #undef setsockopt
1760 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1761 {
1762 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1763 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1764 }
1765
1766 #undef shutdown
1767 int mingw_shutdown(int sockfd, int how)
1768 {
1769 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1770 return shutdown(s, how);
1771 }
1772
1773 #undef listen
1774 int mingw_listen(int sockfd, int backlog)
1775 {
1776 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1777 return listen(s, backlog);
1778 }
1779
1780 #undef accept
1781 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1782 {
1783 int sockfd2;
1784
1785 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1786 SOCKET s2 = accept(s1, sa, sz);
1787
1788 /* convert into a file descriptor */
1789 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1790 int err = errno;
1791 closesocket(s2);
1792 return error("unable to make a socket file descriptor: %s",
1793 strerror(err));
1794 }
1795 return sockfd2;
1796 }
1797
1798 #undef rename
1799 int mingw_rename(const char *pold, const char *pnew)
1800 {
1801 DWORD attrs, gle;
1802 int tries = 0;
1803 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1804 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1805 return -1;
1806
1807 /*
1808 * Try native rename() first to get errno right.
1809 * It is based on MoveFile(), which cannot overwrite existing files.
1810 */
1811 if (!_wrename(wpold, wpnew))
1812 return 0;
1813 if (errno != EEXIST)
1814 return -1;
1815 repeat:
1816 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1817 return 0;
1818 /* TODO: translate more errors */
1819 gle = GetLastError();
1820 if (gle == ERROR_ACCESS_DENIED &&
1821 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1822 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1823 DWORD attrsold = GetFileAttributesW(wpold);
1824 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1825 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1826 errno = EISDIR;
1827 else if (!_wrmdir(wpnew))
1828 goto repeat;
1829 return -1;
1830 }
1831 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1832 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1833 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1834 return 0;
1835 gle = GetLastError();
1836 /* revert file attributes on failure */
1837 SetFileAttributesW(wpnew, attrs);
1838 }
1839 }
1840 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1841 /*
1842 * We assume that some other process had the source or
1843 * destination file open at the wrong moment and retry.
1844 * In order to give the other process a higher chance to
1845 * complete its operation, we give up our time slice now.
1846 * If we have to retry again, we do sleep a bit.
1847 */
1848 Sleep(delay[tries]);
1849 tries++;
1850 goto repeat;
1851 }
1852 if (gle == ERROR_ACCESS_DENIED &&
1853 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1854 "Should I try again?", pold, pnew))
1855 goto repeat;
1856
1857 errno = EACCES;
1858 return -1;
1859 }
1860
1861 /*
1862 * Note that this doesn't return the actual pagesize, but
1863 * the allocation granularity. If future Windows specific git code
1864 * needs the real getpagesize function, we need to find another solution.
1865 */
1866 int mingw_getpagesize(void)
1867 {
1868 SYSTEM_INFO si;
1869 GetSystemInfo(&si);
1870 return si.dwAllocationGranularity;
1871 }
1872
1873 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
1874 enum EXTENDED_NAME_FORMAT {
1875 NameDisplay = 3,
1876 NameUserPrincipal = 8
1877 };
1878
1879 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
1880 {
1881 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
1882 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
1883 static wchar_t wbuffer[1024];
1884 DWORD len;
1885
1886 if (!INIT_PROC_ADDR(GetUserNameExW))
1887 return NULL;
1888
1889 len = ARRAY_SIZE(wbuffer);
1890 if (GetUserNameExW(type, wbuffer, &len)) {
1891 char *converted = xmalloc((len *= 3));
1892 if (xwcstoutf(converted, wbuffer, len) >= 0)
1893 return converted;
1894 free(converted);
1895 }
1896
1897 return NULL;
1898 }
1899
1900 char *mingw_query_user_email(void)
1901 {
1902 return get_extended_user_info(NameUserPrincipal);
1903 }
1904
1905 struct passwd *getpwuid(int uid)
1906 {
1907 static unsigned initialized;
1908 static char user_name[100];
1909 static struct passwd *p;
1910 DWORD len;
1911
1912 if (initialized)
1913 return p;
1914
1915 len = sizeof(user_name);
1916 if (!GetUserName(user_name, &len)) {
1917 initialized = 1;
1918 return NULL;
1919 }
1920
1921 p = xmalloc(sizeof(*p));
1922 p->pw_name = user_name;
1923 p->pw_gecos = get_extended_user_info(NameDisplay);
1924 if (!p->pw_gecos)
1925 p->pw_gecos = "unknown";
1926 p->pw_dir = NULL;
1927
1928 initialized = 1;
1929 return p;
1930 }
1931
1932 static HANDLE timer_event;
1933 static HANDLE timer_thread;
1934 static int timer_interval;
1935 static int one_shot;
1936 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1937
1938 /* The timer works like this:
1939 * The thread, ticktack(), is a trivial routine that most of the time
1940 * only waits to receive the signal to terminate. The main thread tells
1941 * the thread to terminate by setting the timer_event to the signalled
1942 * state.
1943 * But ticktack() interrupts the wait state after the timer's interval
1944 * length to call the signal handler.
1945 */
1946
1947 static unsigned __stdcall ticktack(void *dummy)
1948 {
1949 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1950 mingw_raise(SIGALRM);
1951 if (one_shot)
1952 break;
1953 }
1954 return 0;
1955 }
1956
1957 static int start_timer_thread(void)
1958 {
1959 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1960 if (timer_event) {
1961 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1962 if (!timer_thread )
1963 return errno = ENOMEM,
1964 error("cannot start timer thread");
1965 } else
1966 return errno = ENOMEM,
1967 error("cannot allocate resources for timer");
1968 return 0;
1969 }
1970
1971 static void stop_timer_thread(void)
1972 {
1973 if (timer_event)
1974 SetEvent(timer_event); /* tell thread to terminate */
1975 if (timer_thread) {
1976 int rc = WaitForSingleObject(timer_thread, 1000);
1977 if (rc == WAIT_TIMEOUT)
1978 error("timer thread did not terminate timely");
1979 else if (rc != WAIT_OBJECT_0)
1980 error("waiting for timer thread failed: %lu",
1981 GetLastError());
1982 CloseHandle(timer_thread);
1983 }
1984 if (timer_event)
1985 CloseHandle(timer_event);
1986 timer_event = NULL;
1987 timer_thread = NULL;
1988 }
1989
1990 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1991 {
1992 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1993 }
1994
1995 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1996 {
1997 static const struct timeval zero;
1998 static int atexit_done;
1999
2000 if (out != NULL)
2001 return errno = EINVAL,
2002 error("setitimer param 3 != NULL not implemented");
2003 if (!is_timeval_eq(&in->it_interval, &zero) &&
2004 !is_timeval_eq(&in->it_interval, &in->it_value))
2005 return errno = EINVAL,
2006 error("setitimer: it_interval must be zero or eq it_value");
2007
2008 if (timer_thread)
2009 stop_timer_thread();
2010
2011 if (is_timeval_eq(&in->it_value, &zero) &&
2012 is_timeval_eq(&in->it_interval, &zero))
2013 return 0;
2014
2015 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2016 one_shot = is_timeval_eq(&in->it_interval, &zero);
2017 if (!atexit_done) {
2018 atexit(stop_timer_thread);
2019 atexit_done = 1;
2020 }
2021 return start_timer_thread();
2022 }
2023
2024 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2025 {
2026 if (sig != SIGALRM)
2027 return errno = EINVAL,
2028 error("sigaction only implemented for SIGALRM");
2029 if (out != NULL)
2030 return errno = EINVAL,
2031 error("sigaction: param 3 != NULL not implemented");
2032
2033 timer_fn = in->sa_handler;
2034 return 0;
2035 }
2036
2037 #undef signal
2038 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2039 {
2040 sig_handler_t old;
2041
2042 switch (sig) {
2043 case SIGALRM:
2044 old = timer_fn;
2045 timer_fn = handler;
2046 break;
2047
2048 case SIGINT:
2049 old = sigint_fn;
2050 sigint_fn = handler;
2051 break;
2052
2053 default:
2054 return signal(sig, handler);
2055 }
2056
2057 return old;
2058 }
2059
2060 #undef raise
2061 int mingw_raise(int sig)
2062 {
2063 switch (sig) {
2064 case SIGALRM:
2065 if (timer_fn == SIG_DFL) {
2066 if (isatty(STDERR_FILENO))
2067 fputs("Alarm clock\n", stderr);
2068 exit(128 + SIGALRM);
2069 } else if (timer_fn != SIG_IGN)
2070 timer_fn(SIGALRM);
2071 return 0;
2072
2073 case SIGINT:
2074 if (sigint_fn == SIG_DFL)
2075 exit(128 + SIGINT);
2076 else if (sigint_fn != SIG_IGN)
2077 sigint_fn(SIGINT);
2078 return 0;
2079
2080 default:
2081 return raise(sig);
2082 }
2083 }
2084
2085 int link(const char *oldpath, const char *newpath)
2086 {
2087 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
2088 static T create_hard_link = NULL;
2089 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2090 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2091 xutftowcs_path(wnewpath, newpath) < 0)
2092 return -1;
2093
2094 if (!create_hard_link) {
2095 create_hard_link = (T) GetProcAddress(
2096 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
2097 if (!create_hard_link)
2098 create_hard_link = (T)-1;
2099 }
2100 if (create_hard_link == (T)-1) {
2101 errno = ENOSYS;
2102 return -1;
2103 }
2104 if (!create_hard_link(wnewpath, woldpath, NULL)) {
2105 errno = err_win_to_posix(GetLastError());
2106 return -1;
2107 }
2108 return 0;
2109 }
2110
2111 pid_t waitpid(pid_t pid, int *status, int options)
2112 {
2113 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2114 FALSE, pid);
2115 if (!h) {
2116 errno = ECHILD;
2117 return -1;
2118 }
2119
2120 if (pid > 0 && options & WNOHANG) {
2121 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2122 CloseHandle(h);
2123 return 0;
2124 }
2125 options &= ~WNOHANG;
2126 }
2127
2128 if (options == 0) {
2129 struct pinfo_t **ppinfo;
2130 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2131 CloseHandle(h);
2132 return 0;
2133 }
2134
2135 if (status)
2136 GetExitCodeProcess(h, (LPDWORD)status);
2137
2138 EnterCriticalSection(&pinfo_cs);
2139
2140 ppinfo = &pinfo;
2141 while (*ppinfo) {
2142 struct pinfo_t *info = *ppinfo;
2143 if (info->pid == pid) {
2144 CloseHandle(info->proc);
2145 *ppinfo = info->next;
2146 free(info);
2147 break;
2148 }
2149 ppinfo = &info->next;
2150 }
2151
2152 LeaveCriticalSection(&pinfo_cs);
2153
2154 CloseHandle(h);
2155 return pid;
2156 }
2157 CloseHandle(h);
2158
2159 errno = EINVAL;
2160 return -1;
2161 }
2162
2163 int mingw_skip_dos_drive_prefix(char **path)
2164 {
2165 int ret = has_dos_drive_prefix(*path);
2166 *path += ret;
2167 return ret;
2168 }
2169
2170 int mingw_offset_1st_component(const char *path)
2171 {
2172 char *pos = (char *)path;
2173
2174 /* unc paths */
2175 if (!skip_dos_drive_prefix(&pos) &&
2176 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2177 /* skip server name */
2178 pos = strpbrk(pos + 2, "\\/");
2179 if (!pos)
2180 return 0; /* Error: malformed unc path */
2181
2182 do {
2183 pos++;
2184 } while (*pos && !is_dir_sep(*pos));
2185 }
2186
2187 return pos + is_dir_sep(*pos) - path;
2188 }
2189
2190 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2191 {
2192 int upos = 0, wpos = 0;
2193 const unsigned char *utf = (const unsigned char*) utfs;
2194 if (!utf || !wcs || wcslen < 1) {
2195 errno = EINVAL;
2196 return -1;
2197 }
2198 /* reserve space for \0 */
2199 wcslen--;
2200 if (utflen < 0)
2201 utflen = INT_MAX;
2202
2203 while (upos < utflen) {
2204 int c = utf[upos++] & 0xff;
2205 if (utflen == INT_MAX && c == 0)
2206 break;
2207
2208 if (wpos >= wcslen) {
2209 wcs[wpos] = 0;
2210 errno = ERANGE;
2211 return -1;
2212 }
2213
2214 if (c < 0x80) {
2215 /* ASCII */
2216 wcs[wpos++] = c;
2217 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2218 (utf[upos] & 0xc0) == 0x80) {
2219 /* 2-byte utf-8 */
2220 c = ((c & 0x1f) << 6);
2221 c |= (utf[upos++] & 0x3f);
2222 wcs[wpos++] = c;
2223 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2224 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2225 (utf[upos] & 0xc0) == 0x80 &&
2226 (utf[upos + 1] & 0xc0) == 0x80) {
2227 /* 3-byte utf-8 */
2228 c = ((c & 0x0f) << 12);
2229 c |= ((utf[upos++] & 0x3f) << 6);
2230 c |= (utf[upos++] & 0x3f);
2231 wcs[wpos++] = c;
2232 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2233 wpos + 1 < wcslen &&
2234 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2235 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2236 (utf[upos] & 0xc0) == 0x80 &&
2237 (utf[upos + 1] & 0xc0) == 0x80 &&
2238 (utf[upos + 2] & 0xc0) == 0x80) {
2239 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2240 c = ((c & 0x07) << 18);
2241 c |= ((utf[upos++] & 0x3f) << 12);
2242 c |= ((utf[upos++] & 0x3f) << 6);
2243 c |= (utf[upos++] & 0x3f);
2244 c -= 0x10000;
2245 wcs[wpos++] = 0xd800 | (c >> 10);
2246 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2247 } else if (c >= 0xa0) {
2248 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2249 wcs[wpos++] = c;
2250 } else {
2251 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2252 static const char *hex = "0123456789abcdef";
2253 wcs[wpos++] = hex[c >> 4];
2254 if (wpos < wcslen)
2255 wcs[wpos++] = hex[c & 0x0f];
2256 }
2257 }
2258 wcs[wpos] = 0;
2259 return wpos;
2260 }
2261
2262 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2263 {
2264 if (!wcs || !utf || utflen < 1) {
2265 errno = EINVAL;
2266 return -1;
2267 }
2268 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2269 if (utflen)
2270 return utflen - 1;
2271 errno = ERANGE;
2272 return -1;
2273 }
2274
2275 static void setup_windows_environment(void)
2276 {
2277 char *tmp = getenv("TMPDIR");
2278
2279 /* on Windows it is TMP and TEMP */
2280 if (!tmp) {
2281 if (!(tmp = getenv("TMP")))
2282 tmp = getenv("TEMP");
2283 if (tmp) {
2284 setenv("TMPDIR", tmp, 1);
2285 tmp = getenv("TMPDIR");
2286 }
2287 }
2288
2289 if (tmp) {
2290 /*
2291 * Convert all dir separators to forward slashes,
2292 * to help shell commands called from the Git
2293 * executable (by not mistaking the dir separators
2294 * for escape characters).
2295 */
2296 convert_slashes(tmp);
2297 }
2298
2299 /* simulate TERM to enable auto-color (see color.c) */
2300 if (!getenv("TERM"))
2301 setenv("TERM", "cygwin", 1);
2302 }
2303
2304 /*
2305 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2306 * mingw startup code, see init.c in mingw runtime).
2307 */
2308 int _CRT_glob = 0;
2309
2310 typedef struct {
2311 int newmode;
2312 } _startupinfo;
2313
2314 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2315 _startupinfo *si);
2316
2317 static NORETURN void die_startup(void)
2318 {
2319 fputs("fatal: not enough memory for initialization", stderr);
2320 exit(128);
2321 }
2322
2323 static void *malloc_startup(size_t size)
2324 {
2325 void *result = malloc(size);
2326 if (!result)
2327 die_startup();
2328 return result;
2329 }
2330
2331 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2332 {
2333 len = xwcstoutf(buffer, wcs, len) + 1;
2334 return memcpy(malloc_startup(len), buffer, len);
2335 }
2336
2337 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2338 DWORD desired_access, DWORD flags)
2339 {
2340 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2341 wchar_t buf[MAX_PATH];
2342 DWORD max = ARRAY_SIZE(buf);
2343 HANDLE handle;
2344 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2345
2346 if (!ret || ret >= max)
2347 return;
2348
2349 /* make sure this does not leak into child processes */
2350 SetEnvironmentVariableW(key, NULL);
2351 if (!wcscmp(buf, L"off")) {
2352 close(fd);
2353 handle = GetStdHandle(std_id);
2354 if (handle != INVALID_HANDLE_VALUE)
2355 CloseHandle(handle);
2356 return;
2357 }
2358 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2359 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2360 if (handle == INVALID_HANDLE_VALUE) {
2361 close(fd);
2362 handle = GetStdHandle(std_id);
2363 if (handle != INVALID_HANDLE_VALUE)
2364 CloseHandle(handle);
2365 } else {
2366 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2367 SetStdHandle(std_id, handle);
2368 dup2(new_fd, fd);
2369 /* do *not* close the new_fd: that would close stdout */
2370 }
2371 return;
2372 }
2373 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2374 flags, NULL);
2375 if (handle != INVALID_HANDLE_VALUE) {
2376 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2377 SetStdHandle(std_id, handle);
2378 dup2(new_fd, fd);
2379 close(new_fd);
2380 }
2381 }
2382
2383 static void maybe_redirect_std_handles(void)
2384 {
2385 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2386 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2387 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2388 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2389 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2390 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2391 }
2392
2393 void mingw_startup(void)
2394 {
2395 int i, maxlen, argc;
2396 char *buffer;
2397 wchar_t **wenv, **wargv;
2398 _startupinfo si;
2399
2400 maybe_redirect_std_handles();
2401
2402 /* get wide char arguments and environment */
2403 si.newmode = 0;
2404 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2405 die_startup();
2406
2407 /* determine size of argv and environ conversion buffer */
2408 maxlen = wcslen(wargv[0]);
2409 for (i = 1; i < argc; i++)
2410 maxlen = max(maxlen, wcslen(wargv[i]));
2411 for (i = 0; wenv[i]; i++)
2412 maxlen = max(maxlen, wcslen(wenv[i]));
2413
2414 /*
2415 * nedmalloc can't free CRT memory, allocate resizable environment
2416 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2417 * use it while initializing the environment itself.
2418 */
2419 environ_size = i + 1;
2420 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2421 environ = malloc_startup(environ_alloc);
2422
2423 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2424 maxlen = 3 * maxlen + 1;
2425 buffer = malloc_startup(maxlen);
2426
2427 /* convert command line arguments and environment to UTF-8 */
2428 for (i = 0; i < argc; i++)
2429 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2430 for (i = 0; wenv[i]; i++)
2431 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2432 environ[i] = NULL;
2433 free(buffer);
2434
2435 /* sort environment for O(log n) getenv / putenv */
2436 qsort(environ, i, sizeof(char*), compareenv);
2437
2438 /* fix Windows specific environment settings */
2439 setup_windows_environment();
2440
2441 /* initialize critical section for waitpid pinfo_t list */
2442 InitializeCriticalSection(&pinfo_cs);
2443
2444 /* set up default file mode and file modes for stdin/out/err */
2445 _fmode = _O_BINARY;
2446 _setmode(_fileno(stdin), _O_BINARY);
2447 _setmode(_fileno(stdout), _O_BINARY);
2448 _setmode(_fileno(stderr), _O_BINARY);
2449
2450 /* initialize Unicode console */
2451 winansi_init();
2452 }
2453
2454 int uname(struct utsname *buf)
2455 {
2456 unsigned v = (unsigned)GetVersion();
2457 memset(buf, 0, sizeof(*buf));
2458 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2459 xsnprintf(buf->release, sizeof(buf->release),
2460 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2461 /* assuming NT variants only.. */
2462 xsnprintf(buf->version, sizeof(buf->version),
2463 "%u", (v >> 16) & 0x7fff);
2464 return 0;
2465 }
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