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getpwuid(mingw): provide a better default for the user name
[git.git] / compat / mingw.c
blob90554712932f19a09b162ed14b7089944e63a8ea
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 int mingw_unlink(const char *pathname)
207 {
208 int ret, tries = 0;
209 wchar_t wpathname[MAX_PATH];
210 if (xutftowcs_path(wpathname, pathname) < 0)
211 return -1;
212
213 /* read-only files cannot be removed */
214 _wchmod(wpathname, 0666);
215 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
216 if (!is_file_in_use_error(GetLastError()))
217 break;
218 /*
219 * We assume that some other process had the source or
220 * destination file open at the wrong moment and retry.
221 * In order to give the other process a higher chance to
222 * complete its operation, we give up our time slice now.
223 * If we have to retry again, we do sleep a bit.
224 */
225 Sleep(delay[tries]);
226 tries++;
227 }
228 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
229 ask_yes_no_if_possible("Unlink of file '%s' failed. "
230 "Should I try again?", pathname))
231 ret = _wunlink(wpathname);
232 return ret;
233 }
234
235 static int is_dir_empty(const wchar_t *wpath)
236 {
237 WIN32_FIND_DATAW findbuf;
238 HANDLE handle;
239 wchar_t wbuf[MAX_PATH + 2];
240 wcscpy(wbuf, wpath);
241 wcscat(wbuf, L"\\*");
242 handle = FindFirstFileW(wbuf, &findbuf);
243 if (handle == INVALID_HANDLE_VALUE)
244 return GetLastError() == ERROR_NO_MORE_FILES;
245
246 while (!wcscmp(findbuf.cFileName, L".") ||
247 !wcscmp(findbuf.cFileName, L".."))
248 if (!FindNextFileW(handle, &findbuf)) {
249 DWORD err = GetLastError();
250 FindClose(handle);
251 return err == ERROR_NO_MORE_FILES;
252 }
253 FindClose(handle);
254 return 0;
255 }
256
257 int mingw_rmdir(const char *pathname)
258 {
259 int ret, tries = 0;
260 wchar_t wpathname[MAX_PATH];
261 if (xutftowcs_path(wpathname, pathname) < 0)
262 return -1;
263
264 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
265 if (!is_file_in_use_error(GetLastError()))
266 errno = err_win_to_posix(GetLastError());
267 if (errno != EACCES)
268 break;
269 if (!is_dir_empty(wpathname)) {
270 errno = ENOTEMPTY;
271 break;
272 }
273 /*
274 * We assume that some other process had the source or
275 * destination file open at the wrong moment and retry.
276 * In order to give the other process a higher chance to
277 * complete its operation, we give up our time slice now.
278 * If we have to retry again, we do sleep a bit.
279 */
280 Sleep(delay[tries]);
281 tries++;
282 }
283 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
284 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
285 "Should I try again?", pathname))
286 ret = _wrmdir(wpathname);
287 return ret;
288 }
289
290 static inline int needs_hiding(const char *path)
291 {
292 const char *basename;
293
294 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
295 return 0;
296
297 /* We cannot use basename(), as it would remove trailing slashes */
298 mingw_skip_dos_drive_prefix((char **)&path);
299 if (!*path)
300 return 0;
301
302 for (basename = path; *path; path++)
303 if (is_dir_sep(*path)) {
304 do {
305 path++;
306 } while (is_dir_sep(*path));
307 /* ignore trailing slashes */
308 if (*path)
309 basename = path;
310 }
311
312 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
313 return *basename == '.';
314
315 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
316 return !strncasecmp(".git", basename, 4) &&
317 (!basename[4] || is_dir_sep(basename[4]));
318 }
319
320 static int set_hidden_flag(const wchar_t *path, int set)
321 {
322 DWORD original = GetFileAttributesW(path), modified;
323 if (set)
324 modified = original | FILE_ATTRIBUTE_HIDDEN;
325 else
326 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
327 if (original == modified || SetFileAttributesW(path, modified))
328 return 0;
329 errno = err_win_to_posix(GetLastError());
330 return -1;
331 }
332
333 int mingw_mkdir(const char *path, int mode)
334 {
335 int ret;
336 wchar_t wpath[MAX_PATH];
337 if (xutftowcs_path(wpath, path) < 0)
338 return -1;
339 ret = _wmkdir(wpath);
340 if (!ret && needs_hiding(path))
341 return set_hidden_flag(wpath, 1);
342 return ret;
343 }
344
345 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
346 {
347 HANDLE handle;
348 int fd;
349 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
350
351 /* only these flags are supported */
352 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
353 return errno = ENOSYS, -1;
354
355 /*
356 * FILE_SHARE_WRITE is required to permit child processes
357 * to append to the file.
358 */
359 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
360 FILE_SHARE_WRITE | FILE_SHARE_READ,
361 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
362 if (handle == INVALID_HANDLE_VALUE)
363 return errno = err_win_to_posix(GetLastError()), -1;
364 /*
365 * No O_APPEND here, because the CRT uses it only to reset the
366 * file pointer to EOF on write(); but that is not necessary
367 * for a file created with FILE_APPEND_DATA.
368 */
369 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
370 if (fd < 0)
371 CloseHandle(handle);
372 return fd;
373 }
374
375 int mingw_open (const char *filename, int oflags, ...)
376 {
377 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
378 va_list args;
379 unsigned mode;
380 int fd;
381 wchar_t wfilename[MAX_PATH];
382 open_fn_t open_fn;
383
384 va_start(args, oflags);
385 mode = va_arg(args, int);
386 va_end(args);
387
388 if (filename && !strcmp(filename, "/dev/null"))
389 filename = "nul";
390
391 if (oflags & O_APPEND)
392 open_fn = mingw_open_append;
393 else
394 open_fn = _wopen;
395
396 if (xutftowcs_path(wfilename, filename) < 0)
397 return -1;
398 fd = open_fn(wfilename, oflags, mode);
399
400 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
401 DWORD attrs = GetFileAttributesW(wfilename);
402 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
403 errno = EISDIR;
404 }
405 if ((oflags & O_CREAT) && needs_hiding(filename)) {
406 /*
407 * Internally, _wopen() uses the CreateFile() API which errors
408 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
409 * specified and an already existing file's attributes do not
410 * match *exactly*. As there is no mode or flag we can set that
411 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
412 * again *without* the O_CREAT flag (that corresponds to the
413 * CREATE_ALWAYS flag of CreateFile()).
414 */
415 if (fd < 0 && errno == EACCES)
416 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
417 if (fd >= 0 && set_hidden_flag(wfilename, 1))
418 warning("could not mark '%s' as hidden.", filename);
419 }
420 return fd;
421 }
422
423 static BOOL WINAPI ctrl_ignore(DWORD type)
424 {
425 return TRUE;
426 }
427
428 #undef fgetc
429 int mingw_fgetc(FILE *stream)
430 {
431 int ch;
432 if (!isatty(_fileno(stream)))
433 return fgetc(stream);
434
435 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
436 while (1) {
437 ch = fgetc(stream);
438 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
439 break;
440
441 /* Ctrl+C was pressed, simulate SIGINT and retry */
442 mingw_raise(SIGINT);
443 }
444 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
445 return ch;
446 }
447
448 #undef fopen
449 FILE *mingw_fopen (const char *filename, const char *otype)
450 {
451 int hide = needs_hiding(filename);
452 FILE *file;
453 wchar_t wfilename[MAX_PATH], wotype[4];
454 if (filename && !strcmp(filename, "/dev/null"))
455 filename = "nul";
456 if (xutftowcs_path(wfilename, filename) < 0 ||
457 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
458 return NULL;
459 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
460 error("could not unhide %s", filename);
461 return NULL;
462 }
463 file = _wfopen(wfilename, wotype);
464 if (!file && GetLastError() == ERROR_INVALID_NAME)
465 errno = ENOENT;
466 if (file && hide && set_hidden_flag(wfilename, 1))
467 warning("could not mark '%s' as hidden.", filename);
468 return file;
469 }
470
471 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
472 {
473 int hide = needs_hiding(filename);
474 FILE *file;
475 wchar_t wfilename[MAX_PATH], wotype[4];
476 if (filename && !strcmp(filename, "/dev/null"))
477 filename = "nul";
478 if (xutftowcs_path(wfilename, filename) < 0 ||
479 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
480 return NULL;
481 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
482 error("could not unhide %s", filename);
483 return NULL;
484 }
485 file = _wfreopen(wfilename, wotype, stream);
486 if (file && hide && set_hidden_flag(wfilename, 1))
487 warning("could not mark '%s' as hidden.", filename);
488 return file;
489 }
490
491 #undef fflush
492 int mingw_fflush(FILE *stream)
493 {
494 int ret = fflush(stream);
495
496 /*
497 * write() is used behind the scenes of stdio output functions.
498 * Since git code does not check for errors after each stdio write
499 * operation, it can happen that write() is called by a later
500 * stdio function even if an earlier write() call failed. In the
501 * case of a pipe whose readable end was closed, only the first
502 * call to write() reports EPIPE on Windows. Subsequent write()
503 * calls report EINVAL. It is impossible to notice whether this
504 * fflush invocation triggered such a case, therefore, we have to
505 * catch all EINVAL errors whole-sale.
506 */
507 if (ret && errno == EINVAL)
508 errno = EPIPE;
509
510 return ret;
511 }
512
513 #undef write
514 ssize_t mingw_write(int fd, const void *buf, size_t len)
515 {
516 ssize_t result = write(fd, buf, len);
517
518 if (result < 0 && errno == EINVAL && buf) {
519 /* check if fd is a pipe */
520 HANDLE h = (HANDLE) _get_osfhandle(fd);
521 if (GetFileType(h) == FILE_TYPE_PIPE)
522 errno = EPIPE;
523 else
524 errno = EINVAL;
525 }
526
527 return result;
528 }
529
530 int mingw_access(const char *filename, int mode)
531 {
532 wchar_t wfilename[MAX_PATH];
533 if (xutftowcs_path(wfilename, filename) < 0)
534 return -1;
535 /* X_OK is not supported by the MSVCRT version */
536 return _waccess(wfilename, mode & ~X_OK);
537 }
538
539 int mingw_chdir(const char *dirname)
540 {
541 wchar_t wdirname[MAX_PATH];
542 if (xutftowcs_path(wdirname, dirname) < 0)
543 return -1;
544 return _wchdir(wdirname);
545 }
546
547 int mingw_chmod(const char *filename, int mode)
548 {
549 wchar_t wfilename[MAX_PATH];
550 if (xutftowcs_path(wfilename, filename) < 0)
551 return -1;
552 return _wchmod(wfilename, mode);
553 }
554
555 /*
556 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
557 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
558 */
559 static inline long long filetime_to_hnsec(const FILETIME *ft)
560 {
561 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
562 /* Windows to Unix Epoch conversion */
563 return winTime - 116444736000000000LL;
564 }
565
566 static inline time_t filetime_to_time_t(const FILETIME *ft)
567 {
568 return (time_t)(filetime_to_hnsec(ft) / 10000000);
569 }
570
571 /**
572 * Verifies that safe_create_leading_directories() would succeed.
573 */
574 static int has_valid_directory_prefix(wchar_t *wfilename)
575 {
576 int n = wcslen(wfilename);
577
578 while (n > 0) {
579 wchar_t c = wfilename[--n];
580 DWORD attributes;
581
582 if (!is_dir_sep(c))
583 continue;
584
585 wfilename[n] = L'\0';
586 attributes = GetFileAttributesW(wfilename);
587 wfilename[n] = c;
588 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
589 attributes == FILE_ATTRIBUTE_DEVICE)
590 return 1;
591 if (attributes == INVALID_FILE_ATTRIBUTES)
592 switch (GetLastError()) {
593 case ERROR_PATH_NOT_FOUND:
594 continue;
595 case ERROR_FILE_NOT_FOUND:
596 /* This implies parent directory exists. */
597 return 1;
598 }
599 return 0;
600 }
601 return 1;
602 }
603
604 /* We keep the do_lstat code in a separate function to avoid recursion.
605 * When a path ends with a slash, the stat will fail with ENOENT. In
606 * this case, we strip the trailing slashes and stat again.
607 *
608 * If follow is true then act like stat() and report on the link
609 * target. Otherwise report on the link itself.
610 */
611 static int do_lstat(int follow, const char *file_name, struct stat *buf)
612 {
613 WIN32_FILE_ATTRIBUTE_DATA fdata;
614 wchar_t wfilename[MAX_PATH];
615 if (xutftowcs_path(wfilename, file_name) < 0)
616 return -1;
617
618 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
619 buf->st_ino = 0;
620 buf->st_gid = 0;
621 buf->st_uid = 0;
622 buf->st_nlink = 1;
623 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
624 buf->st_size = fdata.nFileSizeLow |
625 (((off_t)fdata.nFileSizeHigh)<<32);
626 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
627 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
628 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
629 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
630 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
631 WIN32_FIND_DATAW findbuf;
632 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
633 if (handle != INVALID_HANDLE_VALUE) {
634 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
635 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
636 if (follow) {
637 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
638 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
639 } else {
640 buf->st_mode = S_IFLNK;
641 }
642 buf->st_mode |= S_IREAD;
643 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
644 buf->st_mode |= S_IWRITE;
645 }
646 FindClose(handle);
647 }
648 }
649 return 0;
650 }
651 switch (GetLastError()) {
652 case ERROR_ACCESS_DENIED:
653 case ERROR_SHARING_VIOLATION:
654 case ERROR_LOCK_VIOLATION:
655 case ERROR_SHARING_BUFFER_EXCEEDED:
656 errno = EACCES;
657 break;
658 case ERROR_BUFFER_OVERFLOW:
659 errno = ENAMETOOLONG;
660 break;
661 case ERROR_NOT_ENOUGH_MEMORY:
662 errno = ENOMEM;
663 break;
664 case ERROR_PATH_NOT_FOUND:
665 if (!has_valid_directory_prefix(wfilename)) {
666 errno = ENOTDIR;
667 break;
668 }
669 /* fallthru */
670 default:
671 errno = ENOENT;
672 break;
673 }
674 return -1;
675 }
676
677 /* We provide our own lstat/fstat functions, since the provided
678 * lstat/fstat functions are so slow. These stat functions are
679 * tailored for Git's usage (read: fast), and are not meant to be
680 * complete. Note that Git stat()s are redirected to mingw_lstat()
681 * too, since Windows doesn't really handle symlinks that well.
682 */
683 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
684 {
685 int namelen;
686 char alt_name[PATH_MAX];
687
688 if (!do_lstat(follow, file_name, buf))
689 return 0;
690
691 /* if file_name ended in a '/', Windows returned ENOENT;
692 * try again without trailing slashes
693 */
694 if (errno != ENOENT)
695 return -1;
696
697 namelen = strlen(file_name);
698 if (namelen && file_name[namelen-1] != '/')
699 return -1;
700 while (namelen && file_name[namelen-1] == '/')
701 --namelen;
702 if (!namelen || namelen >= PATH_MAX)
703 return -1;
704
705 memcpy(alt_name, file_name, namelen);
706 alt_name[namelen] = 0;
707 return do_lstat(follow, alt_name, buf);
708 }
709
710 int mingw_lstat(const char *file_name, struct stat *buf)
711 {
712 return do_stat_internal(0, file_name, buf);
713 }
714 int mingw_stat(const char *file_name, struct stat *buf)
715 {
716 return do_stat_internal(1, file_name, buf);
717 }
718
719 int mingw_fstat(int fd, struct stat *buf)
720 {
721 HANDLE fh = (HANDLE)_get_osfhandle(fd);
722 BY_HANDLE_FILE_INFORMATION fdata;
723
724 if (fh == INVALID_HANDLE_VALUE) {
725 errno = EBADF;
726 return -1;
727 }
728 /* direct non-file handles to MS's fstat() */
729 if (GetFileType(fh) != FILE_TYPE_DISK)
730 return _fstati64(fd, buf);
731
732 if (GetFileInformationByHandle(fh, &fdata)) {
733 buf->st_ino = 0;
734 buf->st_gid = 0;
735 buf->st_uid = 0;
736 buf->st_nlink = 1;
737 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
738 buf->st_size = fdata.nFileSizeLow |
739 (((off_t)fdata.nFileSizeHigh)<<32);
740 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
741 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
742 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
743 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
744 return 0;
745 }
746 errno = EBADF;
747 return -1;
748 }
749
750 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
751 {
752 long long winTime = t * 10000000LL + 116444736000000000LL;
753 ft->dwLowDateTime = winTime;
754 ft->dwHighDateTime = winTime >> 32;
755 }
756
757 int mingw_utime (const char *file_name, const struct utimbuf *times)
758 {
759 FILETIME mft, aft;
760 int fh, rc;
761 DWORD attrs;
762 wchar_t wfilename[MAX_PATH];
763 if (xutftowcs_path(wfilename, file_name) < 0)
764 return -1;
765
766 /* must have write permission */
767 attrs = GetFileAttributesW(wfilename);
768 if (attrs != INVALID_FILE_ATTRIBUTES &&
769 (attrs & FILE_ATTRIBUTE_READONLY)) {
770 /* ignore errors here; open() will report them */
771 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
772 }
773
774 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
775 rc = -1;
776 goto revert_attrs;
777 }
778
779 if (times) {
780 time_t_to_filetime(times->modtime, &mft);
781 time_t_to_filetime(times->actime, &aft);
782 } else {
783 GetSystemTimeAsFileTime(&mft);
784 aft = mft;
785 }
786 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
787 errno = EINVAL;
788 rc = -1;
789 } else
790 rc = 0;
791 close(fh);
792
793 revert_attrs:
794 if (attrs != INVALID_FILE_ATTRIBUTES &&
795 (attrs & FILE_ATTRIBUTE_READONLY)) {
796 /* ignore errors again */
797 SetFileAttributesW(wfilename, attrs);
798 }
799 return rc;
800 }
801
802 #undef strftime
803 size_t mingw_strftime(char *s, size_t max,
804 const char *format, const struct tm *tm)
805 {
806 size_t ret = strftime(s, max, format, tm);
807
808 if (!ret && errno == EINVAL)
809 die("invalid strftime format: '%s'", format);
810 return ret;
811 }
812
813 unsigned int sleep (unsigned int seconds)
814 {
815 Sleep(seconds*1000);
816 return 0;
817 }
818
819 char *mingw_mktemp(char *template)
820 {
821 wchar_t wtemplate[MAX_PATH];
822 if (xutftowcs_path(wtemplate, template) < 0)
823 return NULL;
824 if (!_wmktemp(wtemplate))
825 return NULL;
826 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
827 return NULL;
828 return template;
829 }
830
831 int mkstemp(char *template)
832 {
833 char *filename = mktemp(template);
834 if (filename == NULL)
835 return -1;
836 return open(filename, O_RDWR | O_CREAT, 0600);
837 }
838
839 int gettimeofday(struct timeval *tv, void *tz)
840 {
841 FILETIME ft;
842 long long hnsec;
843
844 GetSystemTimeAsFileTime(&ft);
845 hnsec = filetime_to_hnsec(&ft);
846 tv->tv_sec = hnsec / 10000000;
847 tv->tv_usec = (hnsec % 10000000) / 10;
848 return 0;
849 }
850
851 int pipe(int filedes[2])
852 {
853 HANDLE h[2];
854
855 /* this creates non-inheritable handles */
856 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
857 errno = err_win_to_posix(GetLastError());
858 return -1;
859 }
860 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
861 if (filedes[0] < 0) {
862 CloseHandle(h[0]);
863 CloseHandle(h[1]);
864 return -1;
865 }
866 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
867 if (filedes[1] < 0) {
868 close(filedes[0]);
869 CloseHandle(h[1]);
870 return -1;
871 }
872 return 0;
873 }
874
875 struct tm *gmtime_r(const time_t *timep, struct tm *result)
876 {
877 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
878 memcpy(result, gmtime(timep), sizeof(struct tm));
879 return result;
880 }
881
882 struct tm *localtime_r(const time_t *timep, struct tm *result)
883 {
884 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
885 memcpy(result, localtime(timep), sizeof(struct tm));
886 return result;
887 }
888
889 char *mingw_getcwd(char *pointer, int len)
890 {
891 wchar_t wpointer[MAX_PATH];
892 if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
893 return NULL;
894 if (xwcstoutf(pointer, wpointer, len) < 0)
895 return NULL;
896 convert_slashes(pointer);
897 return pointer;
898 }
899
900 /*
901 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
902 * (Parsing C++ Command-Line Arguments)
903 */
904 static const char *quote_arg(const char *arg)
905 {
906 /* count chars to quote */
907 int len = 0, n = 0;
908 int force_quotes = 0;
909 char *q, *d;
910 const char *p = arg;
911 if (!*p) force_quotes = 1;
912 while (*p) {
913 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
914 force_quotes = 1;
915 else if (*p == '"')
916 n++;
917 else if (*p == '\\') {
918 int count = 0;
919 while (*p == '\\') {
920 count++;
921 p++;
922 len++;
923 }
924 if (*p == '"')
925 n += count*2 + 1;
926 continue;
927 }
928 len++;
929 p++;
930 }
931 if (!force_quotes && n == 0)
932 return arg;
933
934 /* insert \ where necessary */
935 d = q = xmalloc(st_add3(len, n, 3));
936 *d++ = '"';
937 while (*arg) {
938 if (*arg == '"')
939 *d++ = '\\';
940 else if (*arg == '\\') {
941 int count = 0;
942 while (*arg == '\\') {
943 count++;
944 *d++ = *arg++;
945 }
946 if (*arg == '"') {
947 while (count-- > 0)
948 *d++ = '\\';
949 *d++ = '\\';
950 }
951 }
952 *d++ = *arg++;
953 }
954 *d++ = '"';
955 *d++ = 0;
956 return q;
957 }
958
959 static const char *parse_interpreter(const char *cmd)
960 {
961 static char buf[100];
962 char *p, *opt;
963 int n, fd;
964
965 /* don't even try a .exe */
966 n = strlen(cmd);
967 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
968 return NULL;
969
970 fd = open(cmd, O_RDONLY);
971 if (fd < 0)
972 return NULL;
973 n = read(fd, buf, sizeof(buf)-1);
974 close(fd);
975 if (n < 4) /* at least '#!/x' and not error */
976 return NULL;
977
978 if (buf[0] != '#' || buf[1] != '!')
979 return NULL;
980 buf[n] = '\0';
981 p = buf + strcspn(buf, "\r\n");
982 if (!*p)
983 return NULL;
984
985 *p = '\0';
986 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
987 return NULL;
988 /* strip options */
989 if ((opt = strchr(p+1, ' ')))
990 *opt = '\0';
991 return p+1;
992 }
993
994 /*
995 * exe_only means that we only want to detect .exe files, but not scripts
996 * (which do not have an extension)
997 */
998 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
999 int isexe, int exe_only)
1000 {
1001 char path[MAX_PATH];
1002 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1003
1004 if (!isexe && access(path, F_OK) == 0)
1005 return xstrdup(path);
1006 path[strlen(path)-4] = '\0';
1007 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1008 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1009 return xstrdup(path);
1010 return NULL;
1011 }
1012
1013 /*
1014 * Determines the absolute path of cmd using the split path in path.
1015 * If cmd contains a slash or backslash, no lookup is performed.
1016 */
1017 static char *path_lookup(const char *cmd, int exe_only)
1018 {
1019 const char *path;
1020 char *prog = NULL;
1021 int len = strlen(cmd);
1022 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1023
1024 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1025 return xstrdup(cmd);
1026
1027 path = mingw_getenv("PATH");
1028 if (!path)
1029 return NULL;
1030
1031 while (!prog) {
1032 const char *sep = strchrnul(path, ';');
1033 int dirlen = sep - path;
1034 if (dirlen)
1035 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1036 if (!*sep)
1037 break;
1038 path = sep + 1;
1039 }
1040
1041 return prog;
1042 }
1043
1044 static int do_putenv(char **env, const char *name, int size, int free_old);
1045
1046 /* used number of elements of environ array, including terminating NULL */
1047 static int environ_size = 0;
1048 /* allocated size of environ array, in bytes */
1049 static int environ_alloc = 0;
1050
1051 /*
1052 * Create environment block suitable for CreateProcess. Merges current
1053 * process environment and the supplied environment changes.
1054 */
1055 static wchar_t *make_environment_block(char **deltaenv)
1056 {
1057 wchar_t *wenvblk = NULL;
1058 char **tmpenv;
1059 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1060
1061 while (deltaenv && deltaenv[i])
1062 i++;
1063
1064 /* copy the environment, leaving space for changes */
1065 ALLOC_ARRAY(tmpenv, size + i);
1066 memcpy(tmpenv, environ, size * sizeof(char*));
1067
1068 /* merge supplied environment changes into the temporary environment */
1069 for (i = 0; deltaenv && deltaenv[i]; i++)
1070 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1071
1072 /* create environment block from temporary environment */
1073 for (i = 0; tmpenv[i]; i++) {
1074 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1075 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1076 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1077 }
1078 /* add final \0 terminator */
1079 wenvblk[wenvpos] = 0;
1080 free(tmpenv);
1081 return wenvblk;
1082 }
1083
1084 struct pinfo_t {
1085 struct pinfo_t *next;
1086 pid_t pid;
1087 HANDLE proc;
1088 };
1089 static struct pinfo_t *pinfo = NULL;
1090 CRITICAL_SECTION pinfo_cs;
1091
1092 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1093 const char *dir,
1094 int prepend_cmd, int fhin, int fhout, int fherr)
1095 {
1096 STARTUPINFOW si;
1097 PROCESS_INFORMATION pi;
1098 struct strbuf args;
1099 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1100 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1101 BOOL ret;
1102
1103 /* Determine whether or not we are associated to a console */
1104 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1105 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1106 FILE_ATTRIBUTE_NORMAL, NULL);
1107 if (cons == INVALID_HANDLE_VALUE) {
1108 /* There is no console associated with this process.
1109 * Since the child is a console process, Windows
1110 * would normally create a console window. But
1111 * since we'll be redirecting std streams, we do
1112 * not need the console.
1113 * It is necessary to use DETACHED_PROCESS
1114 * instead of CREATE_NO_WINDOW to make ssh
1115 * recognize that it has no console.
1116 */
1117 flags |= DETACHED_PROCESS;
1118 } else {
1119 /* There is already a console. If we specified
1120 * DETACHED_PROCESS here, too, Windows would
1121 * disassociate the child from the console.
1122 * The same is true for CREATE_NO_WINDOW.
1123 * Go figure!
1124 */
1125 CloseHandle(cons);
1126 }
1127 memset(&si, 0, sizeof(si));
1128 si.cb = sizeof(si);
1129 si.dwFlags = STARTF_USESTDHANDLES;
1130 si.hStdInput = winansi_get_osfhandle(fhin);
1131 si.hStdOutput = winansi_get_osfhandle(fhout);
1132 si.hStdError = winansi_get_osfhandle(fherr);
1133
1134 if (xutftowcs_path(wcmd, cmd) < 0)
1135 return -1;
1136 if (dir && xutftowcs_path(wdir, dir) < 0)
1137 return -1;
1138
1139 /* concatenate argv, quoting args as we go */
1140 strbuf_init(&args, 0);
1141 if (prepend_cmd) {
1142 char *quoted = (char *)quote_arg(cmd);
1143 strbuf_addstr(&args, quoted);
1144 if (quoted != cmd)
1145 free(quoted);
1146 }
1147 for (; *argv; argv++) {
1148 char *quoted = (char *)quote_arg(*argv);
1149 if (*args.buf)
1150 strbuf_addch(&args, ' ');
1151 strbuf_addstr(&args, quoted);
1152 if (quoted != *argv)
1153 free(quoted);
1154 }
1155
1156 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1157 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1158 strbuf_release(&args);
1159
1160 wenvblk = make_environment_block(deltaenv);
1161
1162 memset(&pi, 0, sizeof(pi));
1163 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1164 wenvblk, dir ? wdir : NULL, &si, &pi);
1165
1166 free(wenvblk);
1167 free(wargs);
1168
1169 if (!ret) {
1170 errno = ENOENT;
1171 return -1;
1172 }
1173 CloseHandle(pi.hThread);
1174
1175 /*
1176 * The process ID is the human-readable identifier of the process
1177 * that we want to present in log and error messages. The handle
1178 * is not useful for this purpose. But we cannot close it, either,
1179 * because it is not possible to turn a process ID into a process
1180 * handle after the process terminated.
1181 * Keep the handle in a list for waitpid.
1182 */
1183 EnterCriticalSection(&pinfo_cs);
1184 {
1185 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1186 info->pid = pi.dwProcessId;
1187 info->proc = pi.hProcess;
1188 info->next = pinfo;
1189 pinfo = info;
1190 }
1191 LeaveCriticalSection(&pinfo_cs);
1192
1193 return (pid_t)pi.dwProcessId;
1194 }
1195
1196 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1197 {
1198 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1199 }
1200
1201 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1202 const char *dir,
1203 int fhin, int fhout, int fherr)
1204 {
1205 pid_t pid;
1206 char *prog = path_lookup(cmd, 0);
1207
1208 if (!prog) {
1209 errno = ENOENT;
1210 pid = -1;
1211 }
1212 else {
1213 const char *interpr = parse_interpreter(prog);
1214
1215 if (interpr) {
1216 const char *argv0 = argv[0];
1217 char *iprog = path_lookup(interpr, 1);
1218 argv[0] = prog;
1219 if (!iprog) {
1220 errno = ENOENT;
1221 pid = -1;
1222 }
1223 else {
1224 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1225 fhin, fhout, fherr);
1226 free(iprog);
1227 }
1228 argv[0] = argv0;
1229 }
1230 else
1231 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1232 fhin, fhout, fherr);
1233 free(prog);
1234 }
1235 return pid;
1236 }
1237
1238 static int try_shell_exec(const char *cmd, char *const *argv)
1239 {
1240 const char *interpr = parse_interpreter(cmd);
1241 char *prog;
1242 int pid = 0;
1243
1244 if (!interpr)
1245 return 0;
1246 prog = path_lookup(interpr, 1);
1247 if (prog) {
1248 int argc = 0;
1249 const char **argv2;
1250 while (argv[argc]) argc++;
1251 ALLOC_ARRAY(argv2, argc + 1);
1252 argv2[0] = (char *)cmd; /* full path to the script file */
1253 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1254 pid = mingw_spawnv(prog, argv2, 1);
1255 if (pid >= 0) {
1256 int status;
1257 if (waitpid(pid, &status, 0) < 0)
1258 status = 255;
1259 exit(status);
1260 }
1261 pid = 1; /* indicate that we tried but failed */
1262 free(prog);
1263 free(argv2);
1264 }
1265 return pid;
1266 }
1267
1268 int mingw_execv(const char *cmd, char *const *argv)
1269 {
1270 /* check if git_command is a shell script */
1271 if (!try_shell_exec(cmd, argv)) {
1272 int pid, status;
1273
1274 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1275 if (pid < 0)
1276 return -1;
1277 if (waitpid(pid, &status, 0) < 0)
1278 status = 255;
1279 exit(status);
1280 }
1281 return -1;
1282 }
1283
1284 int mingw_execvp(const char *cmd, char *const *argv)
1285 {
1286 char *prog = path_lookup(cmd, 0);
1287
1288 if (prog) {
1289 mingw_execv(prog, argv);
1290 free(prog);
1291 } else
1292 errno = ENOENT;
1293
1294 return -1;
1295 }
1296
1297 int mingw_kill(pid_t pid, int sig)
1298 {
1299 if (pid > 0 && sig == SIGTERM) {
1300 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1301
1302 if (TerminateProcess(h, -1)) {
1303 CloseHandle(h);
1304 return 0;
1305 }
1306
1307 errno = err_win_to_posix(GetLastError());
1308 CloseHandle(h);
1309 return -1;
1310 } else if (pid > 0 && sig == 0) {
1311 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1312 if (h) {
1313 CloseHandle(h);
1314 return 0;
1315 }
1316 }
1317
1318 errno = EINVAL;
1319 return -1;
1320 }
1321
1322 /*
1323 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1324 */
1325 static int compareenv(const void *v1, const void *v2)
1326 {
1327 const char *e1 = *(const char**)v1;
1328 const char *e2 = *(const char**)v2;
1329
1330 for (;;) {
1331 int c1 = *e1++;
1332 int c2 = *e2++;
1333 c1 = (c1 == '=') ? 0 : tolower(c1);
1334 c2 = (c2 == '=') ? 0 : tolower(c2);
1335 if (c1 > c2)
1336 return 1;
1337 if (c1 < c2)
1338 return -1;
1339 if (c1 == 0)
1340 return 0;
1341 }
1342 }
1343
1344 static int bsearchenv(char **env, const char *name, size_t size)
1345 {
1346 unsigned low = 0, high = size;
1347 while (low < high) {
1348 unsigned mid = low + ((high - low) >> 1);
1349 int cmp = compareenv(&env[mid], &name);
1350 if (cmp < 0)
1351 low = mid + 1;
1352 else if (cmp > 0)
1353 high = mid;
1354 else
1355 return mid;
1356 }
1357 return ~low; /* not found, return 1's complement of insert position */
1358 }
1359
1360 /*
1361 * If name contains '=', then sets the variable, otherwise it unsets it
1362 * Size includes the terminating NULL. Env must have room for size + 1 entries
1363 * (in case of insert). Returns the new size. Optionally frees removed entries.
1364 */
1365 static int do_putenv(char **env, const char *name, int size, int free_old)
1366 {
1367 int i = bsearchenv(env, name, size - 1);
1368
1369 /* optionally free removed / replaced entry */
1370 if (i >= 0 && free_old)
1371 free(env[i]);
1372
1373 if (strchr(name, '=')) {
1374 /* if new value ('key=value') is specified, insert or replace entry */
1375 if (i < 0) {
1376 i = ~i;
1377 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1378 size++;
1379 }
1380 env[i] = (char*) name;
1381 } else if (i >= 0) {
1382 /* otherwise ('key') remove existing entry */
1383 size--;
1384 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1385 }
1386 return size;
1387 }
1388
1389 char *mingw_getenv(const char *name)
1390 {
1391 char *value;
1392 int pos = bsearchenv(environ, name, environ_size - 1);
1393 if (pos < 0)
1394 return NULL;
1395 value = strchr(environ[pos], '=');
1396 return value ? &value[1] : NULL;
1397 }
1398
1399 int mingw_putenv(const char *namevalue)
1400 {
1401 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1402 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1403 return 0;
1404 }
1405
1406 /*
1407 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1408 * that service contains a numerical port, or that it is null. It
1409 * does a simple search using gethostbyname, and returns one IPv4 host
1410 * if one was found.
1411 */
1412 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1413 const struct addrinfo *hints,
1414 struct addrinfo **res)
1415 {
1416 struct hostent *h = NULL;
1417 struct addrinfo *ai;
1418 struct sockaddr_in *sin;
1419
1420 if (node) {
1421 h = gethostbyname(node);
1422 if (!h)
1423 return WSAGetLastError();
1424 }
1425
1426 ai = xmalloc(sizeof(struct addrinfo));
1427 *res = ai;
1428 ai->ai_flags = 0;
1429 ai->ai_family = AF_INET;
1430 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1431 switch (ai->ai_socktype) {
1432 case SOCK_STREAM:
1433 ai->ai_protocol = IPPROTO_TCP;
1434 break;
1435 case SOCK_DGRAM:
1436 ai->ai_protocol = IPPROTO_UDP;
1437 break;
1438 default:
1439 ai->ai_protocol = 0;
1440 break;
1441 }
1442 ai->ai_addrlen = sizeof(struct sockaddr_in);
1443 if (hints && (hints->ai_flags & AI_CANONNAME))
1444 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1445 else
1446 ai->ai_canonname = NULL;
1447
1448 sin = xcalloc(1, ai->ai_addrlen);
1449 sin->sin_family = AF_INET;
1450 /* Note: getaddrinfo is supposed to allow service to be a string,
1451 * which should be looked up using getservbyname. This is
1452 * currently not implemented */
1453 if (service)
1454 sin->sin_port = htons(atoi(service));
1455 if (h)
1456 sin->sin_addr = *(struct in_addr *)h->h_addr;
1457 else if (hints && (hints->ai_flags & AI_PASSIVE))
1458 sin->sin_addr.s_addr = INADDR_ANY;
1459 else
1460 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1461 ai->ai_addr = (struct sockaddr *)sin;
1462 ai->ai_next = NULL;
1463 return 0;
1464 }
1465
1466 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1467 {
1468 free(res->ai_canonname);
1469 free(res->ai_addr);
1470 free(res);
1471 }
1472
1473 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1474 char *host, DWORD hostlen,
1475 char *serv, DWORD servlen, int flags)
1476 {
1477 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1478 if (sa->sa_family != AF_INET)
1479 return EAI_FAMILY;
1480 if (!host && !serv)
1481 return EAI_NONAME;
1482
1483 if (host && hostlen > 0) {
1484 struct hostent *ent = NULL;
1485 if (!(flags & NI_NUMERICHOST))
1486 ent = gethostbyaddr((const char *)&sin->sin_addr,
1487 sizeof(sin->sin_addr), AF_INET);
1488
1489 if (ent)
1490 snprintf(host, hostlen, "%s", ent->h_name);
1491 else if (flags & NI_NAMEREQD)
1492 return EAI_NONAME;
1493 else
1494 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1495 }
1496
1497 if (serv && servlen > 0) {
1498 struct servent *ent = NULL;
1499 if (!(flags & NI_NUMERICSERV))
1500 ent = getservbyport(sin->sin_port,
1501 flags & NI_DGRAM ? "udp" : "tcp");
1502
1503 if (ent)
1504 snprintf(serv, servlen, "%s", ent->s_name);
1505 else
1506 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1507 }
1508
1509 return 0;
1510 }
1511
1512 static HMODULE ipv6_dll = NULL;
1513 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1514 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1515 const struct addrinfo *hints,
1516 struct addrinfo **res);
1517 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1518 char *host, DWORD hostlen,
1519 char *serv, DWORD servlen, int flags);
1520 /*
1521 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1522 * don't need to try to load that one dynamically.
1523 */
1524
1525 static void socket_cleanup(void)
1526 {
1527 WSACleanup();
1528 if (ipv6_dll)
1529 FreeLibrary(ipv6_dll);
1530 ipv6_dll = NULL;
1531 ipv6_freeaddrinfo = freeaddrinfo_stub;
1532 ipv6_getaddrinfo = getaddrinfo_stub;
1533 ipv6_getnameinfo = getnameinfo_stub;
1534 }
1535
1536 static void ensure_socket_initialization(void)
1537 {
1538 WSADATA wsa;
1539 static int initialized = 0;
1540 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1541 const char **name;
1542
1543 if (initialized)
1544 return;
1545
1546 if (WSAStartup(MAKEWORD(2,2), &wsa))
1547 die("unable to initialize winsock subsystem, error %d",
1548 WSAGetLastError());
1549
1550 for (name = libraries; *name; name++) {
1551 ipv6_dll = LoadLibrary(*name);
1552 if (!ipv6_dll)
1553 continue;
1554
1555 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1556 GetProcAddress(ipv6_dll, "freeaddrinfo");
1557 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1558 const struct addrinfo *,
1559 struct addrinfo **))
1560 GetProcAddress(ipv6_dll, "getaddrinfo");
1561 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1562 socklen_t, char *, DWORD,
1563 char *, DWORD, int))
1564 GetProcAddress(ipv6_dll, "getnameinfo");
1565 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1566 FreeLibrary(ipv6_dll);
1567 ipv6_dll = NULL;
1568 } else
1569 break;
1570 }
1571 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1572 ipv6_freeaddrinfo = freeaddrinfo_stub;
1573 ipv6_getaddrinfo = getaddrinfo_stub;
1574 ipv6_getnameinfo = getnameinfo_stub;
1575 }
1576
1577 atexit(socket_cleanup);
1578 initialized = 1;
1579 }
1580
1581 #undef gethostname
1582 int mingw_gethostname(char *name, int namelen)
1583 {
1584 ensure_socket_initialization();
1585 return gethostname(name, namelen);
1586 }
1587
1588 #undef gethostbyname
1589 struct hostent *mingw_gethostbyname(const char *host)
1590 {
1591 ensure_socket_initialization();
1592 return gethostbyname(host);
1593 }
1594
1595 void mingw_freeaddrinfo(struct addrinfo *res)
1596 {
1597 ipv6_freeaddrinfo(res);
1598 }
1599
1600 int mingw_getaddrinfo(const char *node, const char *service,
1601 const struct addrinfo *hints, struct addrinfo **res)
1602 {
1603 ensure_socket_initialization();
1604 return ipv6_getaddrinfo(node, service, hints, res);
1605 }
1606
1607 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1608 char *host, DWORD hostlen, char *serv, DWORD servlen,
1609 int flags)
1610 {
1611 ensure_socket_initialization();
1612 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1613 }
1614
1615 int mingw_socket(int domain, int type, int protocol)
1616 {
1617 int sockfd;
1618 SOCKET s;
1619
1620 ensure_socket_initialization();
1621 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1622 if (s == INVALID_SOCKET) {
1623 /*
1624 * WSAGetLastError() values are regular BSD error codes
1625 * biased by WSABASEERR.
1626 * However, strerror() does not know about networking
1627 * specific errors, which are values beginning at 38 or so.
1628 * Therefore, we choose to leave the biased error code
1629 * in errno so that _if_ someone looks up the code somewhere,
1630 * then it is at least the number that are usually listed.
1631 */
1632 errno = WSAGetLastError();
1633 return -1;
1634 }
1635 /* convert into a file descriptor */
1636 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1637 closesocket(s);
1638 return error("unable to make a socket file descriptor: %s",
1639 strerror(errno));
1640 }
1641 return sockfd;
1642 }
1643
1644 #undef connect
1645 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1646 {
1647 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1648 return connect(s, sa, sz);
1649 }
1650
1651 #undef bind
1652 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1653 {
1654 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1655 return bind(s, sa, sz);
1656 }
1657
1658 #undef setsockopt
1659 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1660 {
1661 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1662 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1663 }
1664
1665 #undef shutdown
1666 int mingw_shutdown(int sockfd, int how)
1667 {
1668 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1669 return shutdown(s, how);
1670 }
1671
1672 #undef listen
1673 int mingw_listen(int sockfd, int backlog)
1674 {
1675 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1676 return listen(s, backlog);
1677 }
1678
1679 #undef accept
1680 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1681 {
1682 int sockfd2;
1683
1684 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1685 SOCKET s2 = accept(s1, sa, sz);
1686
1687 /* convert into a file descriptor */
1688 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1689 int err = errno;
1690 closesocket(s2);
1691 return error("unable to make a socket file descriptor: %s",
1692 strerror(err));
1693 }
1694 return sockfd2;
1695 }
1696
1697 #undef rename
1698 int mingw_rename(const char *pold, const char *pnew)
1699 {
1700 DWORD attrs, gle;
1701 int tries = 0;
1702 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1703 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1704 return -1;
1705
1706 /*
1707 * Try native rename() first to get errno right.
1708 * It is based on MoveFile(), which cannot overwrite existing files.
1709 */
1710 if (!_wrename(wpold, wpnew))
1711 return 0;
1712 if (errno != EEXIST)
1713 return -1;
1714 repeat:
1715 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1716 return 0;
1717 /* TODO: translate more errors */
1718 gle = GetLastError();
1719 if (gle == ERROR_ACCESS_DENIED &&
1720 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1721 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1722 DWORD attrsold = GetFileAttributesW(wpold);
1723 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1724 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1725 errno = EISDIR;
1726 else if (!_wrmdir(wpnew))
1727 goto repeat;
1728 return -1;
1729 }
1730 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1731 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1732 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1733 return 0;
1734 gle = GetLastError();
1735 /* revert file attributes on failure */
1736 SetFileAttributesW(wpnew, attrs);
1737 }
1738 }
1739 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1740 /*
1741 * We assume that some other process had the source or
1742 * destination file open at the wrong moment and retry.
1743 * In order to give the other process a higher chance to
1744 * complete its operation, we give up our time slice now.
1745 * If we have to retry again, we do sleep a bit.
1746 */
1747 Sleep(delay[tries]);
1748 tries++;
1749 goto repeat;
1750 }
1751 if (gle == ERROR_ACCESS_DENIED &&
1752 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1753 "Should I try again?", pold, pnew))
1754 goto repeat;
1755
1756 errno = EACCES;
1757 return -1;
1758 }
1759
1760 /*
1761 * Note that this doesn't return the actual pagesize, but
1762 * the allocation granularity. If future Windows specific git code
1763 * needs the real getpagesize function, we need to find another solution.
1764 */
1765 int mingw_getpagesize(void)
1766 {
1767 SYSTEM_INFO si;
1768 GetSystemInfo(&si);
1769 return si.dwAllocationGranularity;
1770 }
1771
1772 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
1773 enum EXTENDED_NAME_FORMAT {
1774 NameDisplay = 3,
1775 NameUserPrincipal = 8
1776 };
1777
1778 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
1779 {
1780 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
1781 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
1782 static wchar_t wbuffer[1024];
1783 DWORD len;
1784
1785 if (!INIT_PROC_ADDR(GetUserNameExW))
1786 return NULL;
1787
1788 len = ARRAY_SIZE(wbuffer);
1789 if (GetUserNameExW(type, wbuffer, &len)) {
1790 char *converted = xmalloc((len *= 3));
1791 if (xwcstoutf(converted, wbuffer, len) >= 0)
1792 return converted;
1793 free(converted);
1794 }
1795
1796 return NULL;
1797 }
1798
1799 struct passwd *getpwuid(int uid)
1800 {
1801 static unsigned initialized;
1802 static char user_name[100];
1803 static struct passwd *p;
1804 DWORD len;
1805
1806 if (initialized)
1807 return p;
1808
1809 len = sizeof(user_name);
1810 if (!GetUserName(user_name, &len)) {
1811 initialized = 1;
1812 return NULL;
1813 }
1814
1815 p = xmalloc(sizeof(*p));
1816 p->pw_name = user_name;
1817 p->pw_gecos = get_extended_user_info(NameDisplay);
1818 if (!p->pw_gecos)
1819 p->pw_gecos = "unknown";
1820 p->pw_dir = NULL;
1821
1822 initialized = 1;
1823 return p;
1824 }
1825
1826 static HANDLE timer_event;
1827 static HANDLE timer_thread;
1828 static int timer_interval;
1829 static int one_shot;
1830 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1831
1832 /* The timer works like this:
1833 * The thread, ticktack(), is a trivial routine that most of the time
1834 * only waits to receive the signal to terminate. The main thread tells
1835 * the thread to terminate by setting the timer_event to the signalled
1836 * state.
1837 * But ticktack() interrupts the wait state after the timer's interval
1838 * length to call the signal handler.
1839 */
1840
1841 static unsigned __stdcall ticktack(void *dummy)
1842 {
1843 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1844 mingw_raise(SIGALRM);
1845 if (one_shot)
1846 break;
1847 }
1848 return 0;
1849 }
1850
1851 static int start_timer_thread(void)
1852 {
1853 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1854 if (timer_event) {
1855 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1856 if (!timer_thread )
1857 return errno = ENOMEM,
1858 error("cannot start timer thread");
1859 } else
1860 return errno = ENOMEM,
1861 error("cannot allocate resources for timer");
1862 return 0;
1863 }
1864
1865 static void stop_timer_thread(void)
1866 {
1867 if (timer_event)
1868 SetEvent(timer_event); /* tell thread to terminate */
1869 if (timer_thread) {
1870 int rc = WaitForSingleObject(timer_thread, 1000);
1871 if (rc == WAIT_TIMEOUT)
1872 error("timer thread did not terminate timely");
1873 else if (rc != WAIT_OBJECT_0)
1874 error("waiting for timer thread failed: %lu",
1875 GetLastError());
1876 CloseHandle(timer_thread);
1877 }
1878 if (timer_event)
1879 CloseHandle(timer_event);
1880 timer_event = NULL;
1881 timer_thread = NULL;
1882 }
1883
1884 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1885 {
1886 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1887 }
1888
1889 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1890 {
1891 static const struct timeval zero;
1892 static int atexit_done;
1893
1894 if (out != NULL)
1895 return errno = EINVAL,
1896 error("setitimer param 3 != NULL not implemented");
1897 if (!is_timeval_eq(&in->it_interval, &zero) &&
1898 !is_timeval_eq(&in->it_interval, &in->it_value))
1899 return errno = EINVAL,
1900 error("setitimer: it_interval must be zero or eq it_value");
1901
1902 if (timer_thread)
1903 stop_timer_thread();
1904
1905 if (is_timeval_eq(&in->it_value, &zero) &&
1906 is_timeval_eq(&in->it_interval, &zero))
1907 return 0;
1908
1909 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1910 one_shot = is_timeval_eq(&in->it_interval, &zero);
1911 if (!atexit_done) {
1912 atexit(stop_timer_thread);
1913 atexit_done = 1;
1914 }
1915 return start_timer_thread();
1916 }
1917
1918 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1919 {
1920 if (sig != SIGALRM)
1921 return errno = EINVAL,
1922 error("sigaction only implemented for SIGALRM");
1923 if (out != NULL)
1924 return errno = EINVAL,
1925 error("sigaction: param 3 != NULL not implemented");
1926
1927 timer_fn = in->sa_handler;
1928 return 0;
1929 }
1930
1931 #undef signal
1932 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1933 {
1934 sig_handler_t old;
1935
1936 switch (sig) {
1937 case SIGALRM:
1938 old = timer_fn;
1939 timer_fn = handler;
1940 break;
1941
1942 case SIGINT:
1943 old = sigint_fn;
1944 sigint_fn = handler;
1945 break;
1946
1947 default:
1948 return signal(sig, handler);
1949 }
1950
1951 return old;
1952 }
1953
1954 #undef raise
1955 int mingw_raise(int sig)
1956 {
1957 switch (sig) {
1958 case SIGALRM:
1959 if (timer_fn == SIG_DFL) {
1960 if (isatty(STDERR_FILENO))
1961 fputs("Alarm clock\n", stderr);
1962 exit(128 + SIGALRM);
1963 } else if (timer_fn != SIG_IGN)
1964 timer_fn(SIGALRM);
1965 return 0;
1966
1967 case SIGINT:
1968 if (sigint_fn == SIG_DFL)
1969 exit(128 + SIGINT);
1970 else if (sigint_fn != SIG_IGN)
1971 sigint_fn(SIGINT);
1972 return 0;
1973
1974 default:
1975 return raise(sig);
1976 }
1977 }
1978
1979 int link(const char *oldpath, const char *newpath)
1980 {
1981 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1982 static T create_hard_link = NULL;
1983 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1984 if (xutftowcs_path(woldpath, oldpath) < 0 ||
1985 xutftowcs_path(wnewpath, newpath) < 0)
1986 return -1;
1987
1988 if (!create_hard_link) {
1989 create_hard_link = (T) GetProcAddress(
1990 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1991 if (!create_hard_link)
1992 create_hard_link = (T)-1;
1993 }
1994 if (create_hard_link == (T)-1) {
1995 errno = ENOSYS;
1996 return -1;
1997 }
1998 if (!create_hard_link(wnewpath, woldpath, NULL)) {
1999 errno = err_win_to_posix(GetLastError());
2000 return -1;
2001 }
2002 return 0;
2003 }
2004
2005 pid_t waitpid(pid_t pid, int *status, int options)
2006 {
2007 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2008 FALSE, pid);
2009 if (!h) {
2010 errno = ECHILD;
2011 return -1;
2012 }
2013
2014 if (pid > 0 && options & WNOHANG) {
2015 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2016 CloseHandle(h);
2017 return 0;
2018 }
2019 options &= ~WNOHANG;
2020 }
2021
2022 if (options == 0) {
2023 struct pinfo_t **ppinfo;
2024 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2025 CloseHandle(h);
2026 return 0;
2027 }
2028
2029 if (status)
2030 GetExitCodeProcess(h, (LPDWORD)status);
2031
2032 EnterCriticalSection(&pinfo_cs);
2033
2034 ppinfo = &pinfo;
2035 while (*ppinfo) {
2036 struct pinfo_t *info = *ppinfo;
2037 if (info->pid == pid) {
2038 CloseHandle(info->proc);
2039 *ppinfo = info->next;
2040 free(info);
2041 break;
2042 }
2043 ppinfo = &info->next;
2044 }
2045
2046 LeaveCriticalSection(&pinfo_cs);
2047
2048 CloseHandle(h);
2049 return pid;
2050 }
2051 CloseHandle(h);
2052
2053 errno = EINVAL;
2054 return -1;
2055 }
2056
2057 int mingw_skip_dos_drive_prefix(char **path)
2058 {
2059 int ret = has_dos_drive_prefix(*path);
2060 *path += ret;
2061 return ret;
2062 }
2063
2064 int mingw_offset_1st_component(const char *path)
2065 {
2066 char *pos = (char *)path;
2067
2068 /* unc paths */
2069 if (!skip_dos_drive_prefix(&pos) &&
2070 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2071 /* skip server name */
2072 pos = strpbrk(pos + 2, "\\/");
2073 if (!pos)
2074 return 0; /* Error: malformed unc path */
2075
2076 do {
2077 pos++;
2078 } while (*pos && !is_dir_sep(*pos));
2079 }
2080
2081 return pos + is_dir_sep(*pos) - path;
2082 }
2083
2084 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2085 {
2086 int upos = 0, wpos = 0;
2087 const unsigned char *utf = (const unsigned char*) utfs;
2088 if (!utf || !wcs || wcslen < 1) {
2089 errno = EINVAL;
2090 return -1;
2091 }
2092 /* reserve space for \0 */
2093 wcslen--;
2094 if (utflen < 0)
2095 utflen = INT_MAX;
2096
2097 while (upos < utflen) {
2098 int c = utf[upos++] & 0xff;
2099 if (utflen == INT_MAX && c == 0)
2100 break;
2101
2102 if (wpos >= wcslen) {
2103 wcs[wpos] = 0;
2104 errno = ERANGE;
2105 return -1;
2106 }
2107
2108 if (c < 0x80) {
2109 /* ASCII */
2110 wcs[wpos++] = c;
2111 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2112 (utf[upos] & 0xc0) == 0x80) {
2113 /* 2-byte utf-8 */
2114 c = ((c & 0x1f) << 6);
2115 c |= (utf[upos++] & 0x3f);
2116 wcs[wpos++] = c;
2117 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2118 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2119 (utf[upos] & 0xc0) == 0x80 &&
2120 (utf[upos + 1] & 0xc0) == 0x80) {
2121 /* 3-byte utf-8 */
2122 c = ((c & 0x0f) << 12);
2123 c |= ((utf[upos++] & 0x3f) << 6);
2124 c |= (utf[upos++] & 0x3f);
2125 wcs[wpos++] = c;
2126 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2127 wpos + 1 < wcslen &&
2128 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2129 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2130 (utf[upos] & 0xc0) == 0x80 &&
2131 (utf[upos + 1] & 0xc0) == 0x80 &&
2132 (utf[upos + 2] & 0xc0) == 0x80) {
2133 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2134 c = ((c & 0x07) << 18);
2135 c |= ((utf[upos++] & 0x3f) << 12);
2136 c |= ((utf[upos++] & 0x3f) << 6);
2137 c |= (utf[upos++] & 0x3f);
2138 c -= 0x10000;
2139 wcs[wpos++] = 0xd800 | (c >> 10);
2140 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2141 } else if (c >= 0xa0) {
2142 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2143 wcs[wpos++] = c;
2144 } else {
2145 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2146 static const char *hex = "0123456789abcdef";
2147 wcs[wpos++] = hex[c >> 4];
2148 if (wpos < wcslen)
2149 wcs[wpos++] = hex[c & 0x0f];
2150 }
2151 }
2152 wcs[wpos] = 0;
2153 return wpos;
2154 }
2155
2156 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2157 {
2158 if (!wcs || !utf || utflen < 1) {
2159 errno = EINVAL;
2160 return -1;
2161 }
2162 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2163 if (utflen)
2164 return utflen - 1;
2165 errno = ERANGE;
2166 return -1;
2167 }
2168
2169 static void setup_windows_environment(void)
2170 {
2171 char *tmp = getenv("TMPDIR");
2172
2173 /* on Windows it is TMP and TEMP */
2174 if (!tmp) {
2175 if (!(tmp = getenv("TMP")))
2176 tmp = getenv("TEMP");
2177 if (tmp) {
2178 setenv("TMPDIR", tmp, 1);
2179 tmp = getenv("TMPDIR");
2180 }
2181 }
2182
2183 if (tmp) {
2184 /*
2185 * Convert all dir separators to forward slashes,
2186 * to help shell commands called from the Git
2187 * executable (by not mistaking the dir separators
2188 * for escape characters).
2189 */
2190 convert_slashes(tmp);
2191 }
2192
2193 /* simulate TERM to enable auto-color (see color.c) */
2194 if (!getenv("TERM"))
2195 setenv("TERM", "cygwin", 1);
2196 }
2197
2198 /*
2199 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2200 * mingw startup code, see init.c in mingw runtime).
2201 */
2202 int _CRT_glob = 0;
2203
2204 typedef struct {
2205 int newmode;
2206 } _startupinfo;
2207
2208 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2209 _startupinfo *si);
2210
2211 static NORETURN void die_startup(void)
2212 {
2213 fputs("fatal: not enough memory for initialization", stderr);
2214 exit(128);
2215 }
2216
2217 static void *malloc_startup(size_t size)
2218 {
2219 void *result = malloc(size);
2220 if (!result)
2221 die_startup();
2222 return result;
2223 }
2224
2225 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2226 {
2227 len = xwcstoutf(buffer, wcs, len) + 1;
2228 return memcpy(malloc_startup(len), buffer, len);
2229 }
2230
2231 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2232 DWORD desired_access, DWORD flags)
2233 {
2234 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2235 wchar_t buf[MAX_PATH];
2236 DWORD max = ARRAY_SIZE(buf);
2237 HANDLE handle;
2238 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2239
2240 if (!ret || ret >= max)
2241 return;
2242
2243 /* make sure this does not leak into child processes */
2244 SetEnvironmentVariableW(key, NULL);
2245 if (!wcscmp(buf, L"off")) {
2246 close(fd);
2247 handle = GetStdHandle(std_id);
2248 if (handle != INVALID_HANDLE_VALUE)
2249 CloseHandle(handle);
2250 return;
2251 }
2252 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2253 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2254 if (handle == INVALID_HANDLE_VALUE) {
2255 close(fd);
2256 handle = GetStdHandle(std_id);
2257 if (handle != INVALID_HANDLE_VALUE)
2258 CloseHandle(handle);
2259 } else {
2260 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2261 SetStdHandle(std_id, handle);
2262 dup2(new_fd, fd);
2263 /* do *not* close the new_fd: that would close stdout */
2264 }
2265 return;
2266 }
2267 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2268 flags, NULL);
2269 if (handle != INVALID_HANDLE_VALUE) {
2270 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2271 SetStdHandle(std_id, handle);
2272 dup2(new_fd, fd);
2273 close(new_fd);
2274 }
2275 }
2276
2277 static void maybe_redirect_std_handles(void)
2278 {
2279 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2280 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2281 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2282 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2283 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2284 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2285 }
2286
2287 void mingw_startup(void)
2288 {
2289 int i, maxlen, argc;
2290 char *buffer;
2291 wchar_t **wenv, **wargv;
2292 _startupinfo si;
2293
2294 maybe_redirect_std_handles();
2295
2296 /* get wide char arguments and environment */
2297 si.newmode = 0;
2298 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2299 die_startup();
2300
2301 /* determine size of argv and environ conversion buffer */
2302 maxlen = wcslen(wargv[0]);
2303 for (i = 1; i < argc; i++)
2304 maxlen = max(maxlen, wcslen(wargv[i]));
2305 for (i = 0; wenv[i]; i++)
2306 maxlen = max(maxlen, wcslen(wenv[i]));
2307
2308 /*
2309 * nedmalloc can't free CRT memory, allocate resizable environment
2310 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2311 * use it while initializing the environment itself.
2312 */
2313 environ_size = i + 1;
2314 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2315 environ = malloc_startup(environ_alloc);
2316
2317 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2318 maxlen = 3 * maxlen + 1;
2319 buffer = malloc_startup(maxlen);
2320
2321 /* convert command line arguments and environment to UTF-8 */
2322 for (i = 0; i < argc; i++)
2323 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2324 for (i = 0; wenv[i]; i++)
2325 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2326 environ[i] = NULL;
2327 free(buffer);
2328
2329 /* sort environment for O(log n) getenv / putenv */
2330 qsort(environ, i, sizeof(char*), compareenv);
2331
2332 /* fix Windows specific environment settings */
2333 setup_windows_environment();
2334
2335 /* initialize critical section for waitpid pinfo_t list */
2336 InitializeCriticalSection(&pinfo_cs);
2337
2338 /* set up default file mode and file modes for stdin/out/err */
2339 _fmode = _O_BINARY;
2340 _setmode(_fileno(stdin), _O_BINARY);
2341 _setmode(_fileno(stdout), _O_BINARY);
2342 _setmode(_fileno(stderr), _O_BINARY);
2343
2344 /* initialize Unicode console */
2345 winansi_init();
2346 }
2347
2348 int uname(struct utsname *buf)
2349 {
2350 unsigned v = (unsigned)GetVersion();
2351 memset(buf, 0, sizeof(*buf));
2352 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2353 xsnprintf(buf->release, sizeof(buf->release),
2354 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2355 /* assuming NT variants only.. */
2356 xsnprintf(buf->version, sizeof(buf->version),
2357 "%u", (v >> 16) & 0x7fff);
2358 return 0;
2359 }
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