mingw: unset PERL5LIB by default
[git/git.git] / compat / mingw.c
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 #include "../config.h"
10
11 #define HCAST(type, handle) ((type)(intptr_t)handle)
12
13 static const int delay[] = { 0, 1, 10, 20, 40 };
14
15 int err_win_to_posix(DWORD winerr)
16 {
17 int error = ENOSYS;
18 switch(winerr) {
19 case ERROR_ACCESS_DENIED: error = EACCES; break;
20 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
21 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
22 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
23 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
24 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
25 case ERROR_BAD_COMMAND: error = EIO; break;
26 case ERROR_BAD_DEVICE: error = ENODEV; break;
27 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
28 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
29 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
30 case ERROR_BAD_LENGTH: error = EINVAL; break;
31 case ERROR_BAD_PATHNAME: error = ENOENT; break;
32 case ERROR_BAD_PIPE: error = EPIPE; break;
33 case ERROR_BAD_UNIT: error = ENODEV; break;
34 case ERROR_BAD_USERNAME: error = EINVAL; break;
35 case ERROR_BROKEN_PIPE: error = EPIPE; break;
36 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
37 case ERROR_BUSY: error = EBUSY; break;
38 case ERROR_BUSY_DRIVE: error = EBUSY; break;
39 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
40 case ERROR_CANNOT_MAKE: error = EACCES; break;
41 case ERROR_CANTOPEN: error = EIO; break;
42 case ERROR_CANTREAD: error = EIO; break;
43 case ERROR_CANTWRITE: error = EIO; break;
44 case ERROR_CRC: error = EIO; break;
45 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
46 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
47 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
48 case ERROR_DIRECTORY: error = EINVAL; break;
49 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
50 case ERROR_DISK_CHANGE: error = EIO; break;
51 case ERROR_DISK_FULL: error = ENOSPC; break;
52 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
53 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
54 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
55 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
56 case ERROR_FILE_EXISTS: error = EEXIST; break;
57 case ERROR_FILE_INVALID: error = ENODEV; break;
58 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
59 case ERROR_GEN_FAILURE: error = EIO; break;
60 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
61 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
62 case ERROR_INVALID_ACCESS: error = EACCES; break;
63 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
64 case ERROR_INVALID_BLOCK: error = EFAULT; break;
65 case ERROR_INVALID_DATA: error = EINVAL; break;
66 case ERROR_INVALID_DRIVE: error = ENODEV; break;
67 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
68 case ERROR_INVALID_FLAGS: error = EINVAL; break;
69 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
70 case ERROR_INVALID_HANDLE: error = EBADF; break;
71 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
72 case ERROR_INVALID_NAME: error = EINVAL; break;
73 case ERROR_INVALID_OWNER: error = EINVAL; break;
74 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
75 case ERROR_INVALID_PASSWORD: error = EPERM; break;
76 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
77 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
78 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
79 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
80 case ERROR_IO_DEVICE: error = EIO; break;
81 case ERROR_IO_INCOMPLETE: error = EINTR; break;
82 case ERROR_LOCKED: error = EBUSY; break;
83 case ERROR_LOCK_VIOLATION: error = EACCES; break;
84 case ERROR_LOGON_FAILURE: error = EACCES; break;
85 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
86 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
87 case ERROR_MORE_DATA: error = EPIPE; break;
88 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
89 case ERROR_NOACCESS: error = EFAULT; break;
90 case ERROR_NONE_MAPPED: error = EINVAL; break;
91 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
92 case ERROR_NOT_READY: error = EAGAIN; break;
93 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
94 case ERROR_NO_DATA: error = EPIPE; break;
95 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
96 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
97 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
98 case ERROR_OPEN_FAILED: error = EIO; break;
99 case ERROR_OPEN_FILES: error = EBUSY; break;
100 case ERROR_OPERATION_ABORTED: error = EINTR; break;
101 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
102 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
103 case ERROR_PATH_BUSY: error = EBUSY; break;
104 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
105 case ERROR_PIPE_BUSY: error = EBUSY; break;
106 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
107 case ERROR_PIPE_LISTENING: error = EPIPE; break;
108 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
109 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
110 case ERROR_READ_FAULT: error = EIO; break;
111 case ERROR_SEEK: error = EIO; break;
112 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
113 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
114 case ERROR_SHARING_VIOLATION: error = EACCES; break;
115 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
116 case ERROR_SWAPERROR: error = ENOENT; break;
117 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
118 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
119 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
120 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
121 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
122 case ERROR_WRITE_FAULT: error = EIO; break;
123 case ERROR_WRITE_PROTECT: error = EROFS; break;
124 }
125 return error;
126 }
127
128 static inline int is_file_in_use_error(DWORD errcode)
129 {
130 switch (errcode) {
131 case ERROR_SHARING_VIOLATION:
132 case ERROR_ACCESS_DENIED:
133 return 1;
134 }
135
136 return 0;
137 }
138
139 static int read_yes_no_answer(void)
140 {
141 char answer[1024];
142
143 if (fgets(answer, sizeof(answer), stdin)) {
144 size_t answer_len = strlen(answer);
145 int got_full_line = 0, c;
146
147 /* remove the newline */
148 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
149 answer[answer_len-2] = '\0';
150 got_full_line = 1;
151 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
152 answer[answer_len-1] = '\0';
153 got_full_line = 1;
154 }
155 /* flush the buffer in case we did not get the full line */
156 if (!got_full_line)
157 while ((c = getchar()) != EOF && c != '\n')
158 ;
159 } else
160 /* we could not read, return the
161 * default answer which is no */
162 return 0;
163
164 if (tolower(answer[0]) == 'y' && !answer[1])
165 return 1;
166 if (!strncasecmp(answer, "yes", sizeof(answer)))
167 return 1;
168 if (tolower(answer[0]) == 'n' && !answer[1])
169 return 0;
170 if (!strncasecmp(answer, "no", sizeof(answer)))
171 return 0;
172
173 /* did not find an answer we understand */
174 return -1;
175 }
176
177 static int ask_yes_no_if_possible(const char *format, ...)
178 {
179 char question[4096];
180 const char *retry_hook[] = { NULL, NULL, NULL };
181 va_list args;
182
183 va_start(args, format);
184 vsnprintf(question, sizeof(question), format, args);
185 va_end(args);
186
187 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
188 retry_hook[1] = question;
189 return !run_command_v_opt(retry_hook, 0);
190 }
191
192 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
193 return 0;
194
195 while (1) {
196 int answer;
197 fprintf(stderr, "%s (y/n) ", question);
198
199 if ((answer = read_yes_no_answer()) >= 0)
200 return answer;
201
202 fprintf(stderr, "Sorry, I did not understand your answer. "
203 "Please type 'y' or 'n'\n");
204 }
205 }
206
207 /* Windows only */
208 enum hide_dotfiles_type {
209 HIDE_DOTFILES_FALSE = 0,
210 HIDE_DOTFILES_TRUE,
211 HIDE_DOTFILES_DOTGITONLY
212 };
213
214 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
215 static char *unset_environment_variables;
216
217 int mingw_core_config(const char *var, const char *value, void *cb)
218 {
219 if (!strcmp(var, "core.hidedotfiles")) {
220 if (value && !strcasecmp(value, "dotgitonly"))
221 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
222 else
223 hide_dotfiles = git_config_bool(var, value);
224 return 0;
225 }
226
227 if (!strcmp(var, "core.unsetenvvars")) {
228 free(unset_environment_variables);
229 unset_environment_variables = xstrdup(value);
230 return 0;
231 }
232
233 return 0;
234 }
235
236 /* Normalizes NT paths as returned by some low-level APIs. */
237 static wchar_t *normalize_ntpath(wchar_t *wbuf)
238 {
239 int i;
240 /* fix absolute path prefixes */
241 if (wbuf[0] == '\\') {
242 /* strip NT namespace prefixes */
243 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
244 !wcsncmp(wbuf, L"\\\\?\\", 4))
245 wbuf += 4;
246 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
247 wbuf += 12;
248 /* replace remaining '...UNC\' with '\\' */
249 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
250 wbuf += 2;
251 *wbuf = '\\';
252 }
253 }
254 /* convert backslashes to slashes */
255 for (i = 0; wbuf[i]; i++)
256 if (wbuf[i] == '\\')
257 wbuf[i] = '/';
258 return wbuf;
259 }
260
261 int mingw_unlink(const char *pathname)
262 {
263 int ret, tries = 0;
264 wchar_t wpathname[MAX_PATH];
265 if (xutftowcs_path(wpathname, pathname) < 0)
266 return -1;
267
268 /* read-only files cannot be removed */
269 _wchmod(wpathname, 0666);
270 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
271 if (!is_file_in_use_error(GetLastError()))
272 break;
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 && is_file_in_use_error(GetLastError()) &&
284 ask_yes_no_if_possible("Unlink of file '%s' failed. "
285 "Should I try again?", pathname))
286 ret = _wunlink(wpathname);
287 return ret;
288 }
289
290 static int is_dir_empty(const wchar_t *wpath)
291 {
292 WIN32_FIND_DATAW findbuf;
293 HANDLE handle;
294 wchar_t wbuf[MAX_PATH + 2];
295 wcscpy(wbuf, wpath);
296 wcscat(wbuf, L"\\*");
297 handle = FindFirstFileW(wbuf, &findbuf);
298 if (handle == INVALID_HANDLE_VALUE)
299 return GetLastError() == ERROR_NO_MORE_FILES;
300
301 while (!wcscmp(findbuf.cFileName, L".") ||
302 !wcscmp(findbuf.cFileName, L".."))
303 if (!FindNextFileW(handle, &findbuf)) {
304 DWORD err = GetLastError();
305 FindClose(handle);
306 return err == ERROR_NO_MORE_FILES;
307 }
308 FindClose(handle);
309 return 0;
310 }
311
312 int mingw_rmdir(const char *pathname)
313 {
314 int ret, tries = 0;
315 wchar_t wpathname[MAX_PATH];
316 if (xutftowcs_path(wpathname, pathname) < 0)
317 return -1;
318
319 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
320 if (!is_file_in_use_error(GetLastError()))
321 errno = err_win_to_posix(GetLastError());
322 if (errno != EACCES)
323 break;
324 if (!is_dir_empty(wpathname)) {
325 errno = ENOTEMPTY;
326 break;
327 }
328 /*
329 * We assume that some other process had the source or
330 * destination file open at the wrong moment and retry.
331 * In order to give the other process a higher chance to
332 * complete its operation, we give up our time slice now.
333 * If we have to retry again, we do sleep a bit.
334 */
335 Sleep(delay[tries]);
336 tries++;
337 }
338 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
339 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
340 "Should I try again?", pathname))
341 ret = _wrmdir(wpathname);
342 return ret;
343 }
344
345 static inline int needs_hiding(const char *path)
346 {
347 const char *basename;
348
349 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
350 return 0;
351
352 /* We cannot use basename(), as it would remove trailing slashes */
353 mingw_skip_dos_drive_prefix((char **)&path);
354 if (!*path)
355 return 0;
356
357 for (basename = path; *path; path++)
358 if (is_dir_sep(*path)) {
359 do {
360 path++;
361 } while (is_dir_sep(*path));
362 /* ignore trailing slashes */
363 if (*path)
364 basename = path;
365 }
366
367 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
368 return *basename == '.';
369
370 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
371 return !strncasecmp(".git", basename, 4) &&
372 (!basename[4] || is_dir_sep(basename[4]));
373 }
374
375 static int set_hidden_flag(const wchar_t *path, int set)
376 {
377 DWORD original = GetFileAttributesW(path), modified;
378 if (set)
379 modified = original | FILE_ATTRIBUTE_HIDDEN;
380 else
381 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
382 if (original == modified || SetFileAttributesW(path, modified))
383 return 0;
384 errno = err_win_to_posix(GetLastError());
385 return -1;
386 }
387
388 int mingw_mkdir(const char *path, int mode)
389 {
390 int ret;
391 wchar_t wpath[MAX_PATH];
392 if (xutftowcs_path(wpath, path) < 0)
393 return -1;
394 ret = _wmkdir(wpath);
395 if (!ret && needs_hiding(path))
396 return set_hidden_flag(wpath, 1);
397 return ret;
398 }
399
400 /*
401 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
402 * is documented in [1] as opening a writable file handle in append mode.
403 * (It is believed that) this is atomic since it is maintained by the
404 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
405 *
406 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
407 *
408 * This trick does not appear to work for named pipes. Instead it creates
409 * a named pipe client handle that cannot be written to. Callers should
410 * just use the regular _wopen() for them. (And since client handle gets
411 * bound to a unique server handle, it isn't really an issue.)
412 */
413 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
414 {
415 HANDLE handle;
416 int fd;
417 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
418
419 /* only these flags are supported */
420 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
421 return errno = ENOSYS, -1;
422
423 /*
424 * FILE_SHARE_WRITE is required to permit child processes
425 * to append to the file.
426 */
427 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
428 FILE_SHARE_WRITE | FILE_SHARE_READ,
429 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
430 if (handle == INVALID_HANDLE_VALUE)
431 return errno = err_win_to_posix(GetLastError()), -1;
432
433 /*
434 * No O_APPEND here, because the CRT uses it only to reset the
435 * file pointer to EOF before each write(); but that is not
436 * necessary (and may lead to races) for a file created with
437 * FILE_APPEND_DATA.
438 */
439 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
440 if (fd < 0)
441 CloseHandle(handle);
442 return fd;
443 }
444
445 /*
446 * Does the pathname map to the local named pipe filesystem?
447 * That is, does it have a "//./pipe/" prefix?
448 */
449 static int is_local_named_pipe_path(const char *filename)
450 {
451 return (is_dir_sep(filename[0]) &&
452 is_dir_sep(filename[1]) &&
453 filename[2] == '.' &&
454 is_dir_sep(filename[3]) &&
455 !strncasecmp(filename+4, "pipe", 4) &&
456 is_dir_sep(filename[8]) &&
457 filename[9]);
458 }
459
460 int mingw_open (const char *filename, int oflags, ...)
461 {
462 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
463 va_list args;
464 unsigned mode;
465 int fd;
466 wchar_t wfilename[MAX_PATH];
467 open_fn_t open_fn;
468
469 va_start(args, oflags);
470 mode = va_arg(args, int);
471 va_end(args);
472
473 if (filename && !strcmp(filename, "/dev/null"))
474 filename = "nul";
475
476 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
477 open_fn = mingw_open_append;
478 else
479 open_fn = _wopen;
480
481 if (xutftowcs_path(wfilename, filename) < 0)
482 return -1;
483 fd = open_fn(wfilename, oflags, mode);
484
485 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
486 DWORD attrs = GetFileAttributesW(wfilename);
487 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
488 errno = EISDIR;
489 }
490 if ((oflags & O_CREAT) && needs_hiding(filename)) {
491 /*
492 * Internally, _wopen() uses the CreateFile() API which errors
493 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
494 * specified and an already existing file's attributes do not
495 * match *exactly*. As there is no mode or flag we can set that
496 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
497 * again *without* the O_CREAT flag (that corresponds to the
498 * CREATE_ALWAYS flag of CreateFile()).
499 */
500 if (fd < 0 && errno == EACCES)
501 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
502 if (fd >= 0 && set_hidden_flag(wfilename, 1))
503 warning("could not mark '%s' as hidden.", filename);
504 }
505 return fd;
506 }
507
508 static BOOL WINAPI ctrl_ignore(DWORD type)
509 {
510 return TRUE;
511 }
512
513 #undef fgetc
514 int mingw_fgetc(FILE *stream)
515 {
516 int ch;
517 if (!isatty(_fileno(stream)))
518 return fgetc(stream);
519
520 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
521 while (1) {
522 ch = fgetc(stream);
523 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
524 break;
525
526 /* Ctrl+C was pressed, simulate SIGINT and retry */
527 mingw_raise(SIGINT);
528 }
529 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
530 return ch;
531 }
532
533 #undef fopen
534 FILE *mingw_fopen (const char *filename, const char *otype)
535 {
536 int hide = needs_hiding(filename);
537 FILE *file;
538 wchar_t wfilename[MAX_PATH], wotype[4];
539 if (filename && !strcmp(filename, "/dev/null"))
540 filename = "nul";
541 if (xutftowcs_path(wfilename, filename) < 0 ||
542 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
543 return NULL;
544 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
545 error("could not unhide %s", filename);
546 return NULL;
547 }
548 file = _wfopen(wfilename, wotype);
549 if (!file && GetLastError() == ERROR_INVALID_NAME)
550 errno = ENOENT;
551 if (file && hide && set_hidden_flag(wfilename, 1))
552 warning("could not mark '%s' as hidden.", filename);
553 return file;
554 }
555
556 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
557 {
558 int hide = needs_hiding(filename);
559 FILE *file;
560 wchar_t wfilename[MAX_PATH], wotype[4];
561 if (filename && !strcmp(filename, "/dev/null"))
562 filename = "nul";
563 if (xutftowcs_path(wfilename, filename) < 0 ||
564 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
565 return NULL;
566 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
567 error("could not unhide %s", filename);
568 return NULL;
569 }
570 file = _wfreopen(wfilename, wotype, stream);
571 if (file && hide && set_hidden_flag(wfilename, 1))
572 warning("could not mark '%s' as hidden.", filename);
573 return file;
574 }
575
576 #undef fflush
577 int mingw_fflush(FILE *stream)
578 {
579 int ret = fflush(stream);
580
581 /*
582 * write() is used behind the scenes of stdio output functions.
583 * Since git code does not check for errors after each stdio write
584 * operation, it can happen that write() is called by a later
585 * stdio function even if an earlier write() call failed. In the
586 * case of a pipe whose readable end was closed, only the first
587 * call to write() reports EPIPE on Windows. Subsequent write()
588 * calls report EINVAL. It is impossible to notice whether this
589 * fflush invocation triggered such a case, therefore, we have to
590 * catch all EINVAL errors whole-sale.
591 */
592 if (ret && errno == EINVAL)
593 errno = EPIPE;
594
595 return ret;
596 }
597
598 #undef write
599 ssize_t mingw_write(int fd, const void *buf, size_t len)
600 {
601 ssize_t result = write(fd, buf, len);
602
603 if (result < 0 && errno == EINVAL && buf) {
604 /* check if fd is a pipe */
605 HANDLE h = (HANDLE) _get_osfhandle(fd);
606 if (GetFileType(h) == FILE_TYPE_PIPE)
607 errno = EPIPE;
608 else
609 errno = EINVAL;
610 }
611
612 return result;
613 }
614
615 int mingw_access(const char *filename, int mode)
616 {
617 wchar_t wfilename[MAX_PATH];
618 if (xutftowcs_path(wfilename, filename) < 0)
619 return -1;
620 /* X_OK is not supported by the MSVCRT version */
621 return _waccess(wfilename, mode & ~X_OK);
622 }
623
624 int mingw_chdir(const char *dirname)
625 {
626 wchar_t wdirname[MAX_PATH];
627 if (xutftowcs_path(wdirname, dirname) < 0)
628 return -1;
629 return _wchdir(wdirname);
630 }
631
632 int mingw_chmod(const char *filename, int mode)
633 {
634 wchar_t wfilename[MAX_PATH];
635 if (xutftowcs_path(wfilename, filename) < 0)
636 return -1;
637 return _wchmod(wfilename, mode);
638 }
639
640 /*
641 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
642 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
643 */
644 static inline long long filetime_to_hnsec(const FILETIME *ft)
645 {
646 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
647 /* Windows to Unix Epoch conversion */
648 return winTime - 116444736000000000LL;
649 }
650
651 static inline time_t filetime_to_time_t(const FILETIME *ft)
652 {
653 return (time_t)(filetime_to_hnsec(ft) / 10000000);
654 }
655
656 /**
657 * Verifies that safe_create_leading_directories() would succeed.
658 */
659 static int has_valid_directory_prefix(wchar_t *wfilename)
660 {
661 int n = wcslen(wfilename);
662
663 while (n > 0) {
664 wchar_t c = wfilename[--n];
665 DWORD attributes;
666
667 if (!is_dir_sep(c))
668 continue;
669
670 wfilename[n] = L'\0';
671 attributes = GetFileAttributesW(wfilename);
672 wfilename[n] = c;
673 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
674 attributes == FILE_ATTRIBUTE_DEVICE)
675 return 1;
676 if (attributes == INVALID_FILE_ATTRIBUTES)
677 switch (GetLastError()) {
678 case ERROR_PATH_NOT_FOUND:
679 continue;
680 case ERROR_FILE_NOT_FOUND:
681 /* This implies parent directory exists. */
682 return 1;
683 }
684 return 0;
685 }
686 return 1;
687 }
688
689 /* We keep the do_lstat code in a separate function to avoid recursion.
690 * When a path ends with a slash, the stat will fail with ENOENT. In
691 * this case, we strip the trailing slashes and stat again.
692 *
693 * If follow is true then act like stat() and report on the link
694 * target. Otherwise report on the link itself.
695 */
696 static int do_lstat(int follow, const char *file_name, struct stat *buf)
697 {
698 WIN32_FILE_ATTRIBUTE_DATA fdata;
699 wchar_t wfilename[MAX_PATH];
700 if (xutftowcs_path(wfilename, file_name) < 0)
701 return -1;
702
703 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
704 buf->st_ino = 0;
705 buf->st_gid = 0;
706 buf->st_uid = 0;
707 buf->st_nlink = 1;
708 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
709 buf->st_size = fdata.nFileSizeLow |
710 (((off_t)fdata.nFileSizeHigh)<<32);
711 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
712 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
713 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
714 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
715 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
716 WIN32_FIND_DATAW findbuf;
717 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
718 if (handle != INVALID_HANDLE_VALUE) {
719 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
720 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
721 if (follow) {
722 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
723 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
724 } else {
725 buf->st_mode = S_IFLNK;
726 }
727 buf->st_mode |= S_IREAD;
728 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
729 buf->st_mode |= S_IWRITE;
730 }
731 FindClose(handle);
732 }
733 }
734 return 0;
735 }
736 switch (GetLastError()) {
737 case ERROR_ACCESS_DENIED:
738 case ERROR_SHARING_VIOLATION:
739 case ERROR_LOCK_VIOLATION:
740 case ERROR_SHARING_BUFFER_EXCEEDED:
741 errno = EACCES;
742 break;
743 case ERROR_BUFFER_OVERFLOW:
744 errno = ENAMETOOLONG;
745 break;
746 case ERROR_NOT_ENOUGH_MEMORY:
747 errno = ENOMEM;
748 break;
749 case ERROR_PATH_NOT_FOUND:
750 if (!has_valid_directory_prefix(wfilename)) {
751 errno = ENOTDIR;
752 break;
753 }
754 /* fallthru */
755 default:
756 errno = ENOENT;
757 break;
758 }
759 return -1;
760 }
761
762 /* We provide our own lstat/fstat functions, since the provided
763 * lstat/fstat functions are so slow. These stat functions are
764 * tailored for Git's usage (read: fast), and are not meant to be
765 * complete. Note that Git stat()s are redirected to mingw_lstat()
766 * too, since Windows doesn't really handle symlinks that well.
767 */
768 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
769 {
770 int namelen;
771 char alt_name[PATH_MAX];
772
773 if (!do_lstat(follow, file_name, buf))
774 return 0;
775
776 /* if file_name ended in a '/', Windows returned ENOENT;
777 * try again without trailing slashes
778 */
779 if (errno != ENOENT)
780 return -1;
781
782 namelen = strlen(file_name);
783 if (namelen && file_name[namelen-1] != '/')
784 return -1;
785 while (namelen && file_name[namelen-1] == '/')
786 --namelen;
787 if (!namelen || namelen >= PATH_MAX)
788 return -1;
789
790 memcpy(alt_name, file_name, namelen);
791 alt_name[namelen] = 0;
792 return do_lstat(follow, alt_name, buf);
793 }
794
795 int mingw_lstat(const char *file_name, struct stat *buf)
796 {
797 return do_stat_internal(0, file_name, buf);
798 }
799 int mingw_stat(const char *file_name, struct stat *buf)
800 {
801 return do_stat_internal(1, file_name, buf);
802 }
803
804 int mingw_fstat(int fd, struct stat *buf)
805 {
806 HANDLE fh = (HANDLE)_get_osfhandle(fd);
807 BY_HANDLE_FILE_INFORMATION fdata;
808
809 if (fh == INVALID_HANDLE_VALUE) {
810 errno = EBADF;
811 return -1;
812 }
813 /* direct non-file handles to MS's fstat() */
814 if (GetFileType(fh) != FILE_TYPE_DISK)
815 return _fstati64(fd, buf);
816
817 if (GetFileInformationByHandle(fh, &fdata)) {
818 buf->st_ino = 0;
819 buf->st_gid = 0;
820 buf->st_uid = 0;
821 buf->st_nlink = 1;
822 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
823 buf->st_size = fdata.nFileSizeLow |
824 (((off_t)fdata.nFileSizeHigh)<<32);
825 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
826 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
827 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
828 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
829 return 0;
830 }
831 errno = EBADF;
832 return -1;
833 }
834
835 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
836 {
837 long long winTime = t * 10000000LL + 116444736000000000LL;
838 ft->dwLowDateTime = winTime;
839 ft->dwHighDateTime = winTime >> 32;
840 }
841
842 int mingw_utime (const char *file_name, const struct utimbuf *times)
843 {
844 FILETIME mft, aft;
845 int fh, rc;
846 DWORD attrs;
847 wchar_t wfilename[MAX_PATH];
848 if (xutftowcs_path(wfilename, file_name) < 0)
849 return -1;
850
851 /* must have write permission */
852 attrs = GetFileAttributesW(wfilename);
853 if (attrs != INVALID_FILE_ATTRIBUTES &&
854 (attrs & FILE_ATTRIBUTE_READONLY)) {
855 /* ignore errors here; open() will report them */
856 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
857 }
858
859 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
860 rc = -1;
861 goto revert_attrs;
862 }
863
864 if (times) {
865 time_t_to_filetime(times->modtime, &mft);
866 time_t_to_filetime(times->actime, &aft);
867 } else {
868 GetSystemTimeAsFileTime(&mft);
869 aft = mft;
870 }
871 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
872 errno = EINVAL;
873 rc = -1;
874 } else
875 rc = 0;
876 close(fh);
877
878 revert_attrs:
879 if (attrs != INVALID_FILE_ATTRIBUTES &&
880 (attrs & FILE_ATTRIBUTE_READONLY)) {
881 /* ignore errors again */
882 SetFileAttributesW(wfilename, attrs);
883 }
884 return rc;
885 }
886
887 #undef strftime
888 size_t mingw_strftime(char *s, size_t max,
889 const char *format, const struct tm *tm)
890 {
891 size_t ret = strftime(s, max, format, tm);
892
893 if (!ret && errno == EINVAL)
894 die("invalid strftime format: '%s'", format);
895 return ret;
896 }
897
898 unsigned int sleep (unsigned int seconds)
899 {
900 Sleep(seconds*1000);
901 return 0;
902 }
903
904 char *mingw_mktemp(char *template)
905 {
906 wchar_t wtemplate[MAX_PATH];
907 if (xutftowcs_path(wtemplate, template) < 0)
908 return NULL;
909 if (!_wmktemp(wtemplate))
910 return NULL;
911 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
912 return NULL;
913 return template;
914 }
915
916 int mkstemp(char *template)
917 {
918 char *filename = mktemp(template);
919 if (filename == NULL)
920 return -1;
921 return open(filename, O_RDWR | O_CREAT, 0600);
922 }
923
924 int gettimeofday(struct timeval *tv, void *tz)
925 {
926 FILETIME ft;
927 long long hnsec;
928
929 GetSystemTimeAsFileTime(&ft);
930 hnsec = filetime_to_hnsec(&ft);
931 tv->tv_sec = hnsec / 10000000;
932 tv->tv_usec = (hnsec % 10000000) / 10;
933 return 0;
934 }
935
936 int pipe(int filedes[2])
937 {
938 HANDLE h[2];
939
940 /* this creates non-inheritable handles */
941 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
942 errno = err_win_to_posix(GetLastError());
943 return -1;
944 }
945 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
946 if (filedes[0] < 0) {
947 CloseHandle(h[0]);
948 CloseHandle(h[1]);
949 return -1;
950 }
951 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
952 if (filedes[1] < 0) {
953 close(filedes[0]);
954 CloseHandle(h[1]);
955 return -1;
956 }
957 return 0;
958 }
959
960 struct tm *gmtime_r(const time_t *timep, struct tm *result)
961 {
962 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
963 memcpy(result, gmtime(timep), sizeof(struct tm));
964 return result;
965 }
966
967 struct tm *localtime_r(const time_t *timep, struct tm *result)
968 {
969 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
970 memcpy(result, localtime(timep), sizeof(struct tm));
971 return result;
972 }
973
974 char *mingw_getcwd(char *pointer, int len)
975 {
976 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
977 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
978
979 if (!ret || ret >= ARRAY_SIZE(cwd)) {
980 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
981 return NULL;
982 }
983 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
984 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
985 HANDLE hnd = CreateFileW(cwd, 0,
986 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
987 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
988 if (hnd == INVALID_HANDLE_VALUE)
989 return NULL;
990 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
991 CloseHandle(hnd);
992 if (!ret || ret >= ARRAY_SIZE(wpointer))
993 return NULL;
994 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
995 return NULL;
996 return pointer;
997 }
998 if (!ret || ret >= ARRAY_SIZE(wpointer))
999 return NULL;
1000 if (xwcstoutf(pointer, wpointer, len) < 0)
1001 return NULL;
1002 convert_slashes(pointer);
1003 return pointer;
1004 }
1005
1006 /*
1007 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
1008 * (Parsing C++ Command-Line Arguments)
1009 */
1010 static const char *quote_arg(const char *arg)
1011 {
1012 /* count chars to quote */
1013 int len = 0, n = 0;
1014 int force_quotes = 0;
1015 char *q, *d;
1016 const char *p = arg;
1017 if (!*p) force_quotes = 1;
1018 while (*p) {
1019 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1020 force_quotes = 1;
1021 else if (*p == '"')
1022 n++;
1023 else if (*p == '\\') {
1024 int count = 0;
1025 while (*p == '\\') {
1026 count++;
1027 p++;
1028 len++;
1029 }
1030 if (*p == '"')
1031 n += count*2 + 1;
1032 continue;
1033 }
1034 len++;
1035 p++;
1036 }
1037 if (!force_quotes && n == 0)
1038 return arg;
1039
1040 /* insert \ where necessary */
1041 d = q = xmalloc(st_add3(len, n, 3));
1042 *d++ = '"';
1043 while (*arg) {
1044 if (*arg == '"')
1045 *d++ = '\\';
1046 else if (*arg == '\\') {
1047 int count = 0;
1048 while (*arg == '\\') {
1049 count++;
1050 *d++ = *arg++;
1051 }
1052 if (*arg == '"') {
1053 while (count-- > 0)
1054 *d++ = '\\';
1055 *d++ = '\\';
1056 }
1057 }
1058 *d++ = *arg++;
1059 }
1060 *d++ = '"';
1061 *d++ = 0;
1062 return q;
1063 }
1064
1065 static const char *parse_interpreter(const char *cmd)
1066 {
1067 static char buf[100];
1068 char *p, *opt;
1069 int n, fd;
1070
1071 /* don't even try a .exe */
1072 n = strlen(cmd);
1073 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1074 return NULL;
1075
1076 fd = open(cmd, O_RDONLY);
1077 if (fd < 0)
1078 return NULL;
1079 n = read(fd, buf, sizeof(buf)-1);
1080 close(fd);
1081 if (n < 4) /* at least '#!/x' and not error */
1082 return NULL;
1083
1084 if (buf[0] != '#' || buf[1] != '!')
1085 return NULL;
1086 buf[n] = '\0';
1087 p = buf + strcspn(buf, "\r\n");
1088 if (!*p)
1089 return NULL;
1090
1091 *p = '\0';
1092 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1093 return NULL;
1094 /* strip options */
1095 if ((opt = strchr(p+1, ' ')))
1096 *opt = '\0';
1097 return p+1;
1098 }
1099
1100 /*
1101 * exe_only means that we only want to detect .exe files, but not scripts
1102 * (which do not have an extension)
1103 */
1104 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1105 int isexe, int exe_only)
1106 {
1107 char path[MAX_PATH];
1108 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1109
1110 if (!isexe && access(path, F_OK) == 0)
1111 return xstrdup(path);
1112 path[strlen(path)-4] = '\0';
1113 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1114 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1115 return xstrdup(path);
1116 return NULL;
1117 }
1118
1119 /*
1120 * Determines the absolute path of cmd using the split path in path.
1121 * If cmd contains a slash or backslash, no lookup is performed.
1122 */
1123 static char *path_lookup(const char *cmd, int exe_only)
1124 {
1125 const char *path;
1126 char *prog = NULL;
1127 int len = strlen(cmd);
1128 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1129
1130 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1131 return xstrdup(cmd);
1132
1133 path = mingw_getenv("PATH");
1134 if (!path)
1135 return NULL;
1136
1137 while (!prog) {
1138 const char *sep = strchrnul(path, ';');
1139 int dirlen = sep - path;
1140 if (dirlen)
1141 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1142 if (!*sep)
1143 break;
1144 path = sep + 1;
1145 }
1146
1147 return prog;
1148 }
1149
1150 static int do_putenv(char **env, const char *name, int size, int free_old);
1151
1152 /* used number of elements of environ array, including terminating NULL */
1153 static int environ_size = 0;
1154 /* allocated size of environ array, in bytes */
1155 static int environ_alloc = 0;
1156
1157 /*
1158 * Create environment block suitable for CreateProcess. Merges current
1159 * process environment and the supplied environment changes.
1160 */
1161 static wchar_t *make_environment_block(char **deltaenv)
1162 {
1163 wchar_t *wenvblk = NULL;
1164 char **tmpenv;
1165 int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1166
1167 while (deltaenv && deltaenv[i])
1168 i++;
1169
1170 /* copy the environment, leaving space for changes */
1171 ALLOC_ARRAY(tmpenv, size + i);
1172 memcpy(tmpenv, environ, size * sizeof(char*));
1173
1174 /* merge supplied environment changes into the temporary environment */
1175 for (i = 0; deltaenv && deltaenv[i]; i++)
1176 size = do_putenv(tmpenv, deltaenv[i], size, 0);
1177
1178 /* create environment block from temporary environment */
1179 for (i = 0; tmpenv[i]; i++) {
1180 size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1181 ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1182 wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1183 }
1184 /* add final \0 terminator */
1185 wenvblk[wenvpos] = 0;
1186 free(tmpenv);
1187 return wenvblk;
1188 }
1189
1190 static void do_unset_environment_variables(void)
1191 {
1192 static int done;
1193 char *p = unset_environment_variables;
1194
1195 if (done || !p)
1196 return;
1197 done = 1;
1198
1199 for (;;) {
1200 char *comma = strchr(p, ',');
1201
1202 if (comma)
1203 *comma = '\0';
1204 unsetenv(p);
1205 if (!comma)
1206 break;
1207 p = comma + 1;
1208 }
1209 }
1210
1211 struct pinfo_t {
1212 struct pinfo_t *next;
1213 pid_t pid;
1214 HANDLE proc;
1215 };
1216 static struct pinfo_t *pinfo = NULL;
1217 CRITICAL_SECTION pinfo_cs;
1218
1219 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1220 const char *dir,
1221 int prepend_cmd, int fhin, int fhout, int fherr)
1222 {
1223 STARTUPINFOW si;
1224 PROCESS_INFORMATION pi;
1225 struct strbuf args;
1226 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1227 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1228 BOOL ret;
1229 HANDLE cons;
1230
1231 do_unset_environment_variables();
1232
1233 /* Determine whether or not we are associated to a console */
1234 cons = CreateFile("CONOUT$", GENERIC_WRITE,
1235 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1236 FILE_ATTRIBUTE_NORMAL, NULL);
1237 if (cons == INVALID_HANDLE_VALUE) {
1238 /* There is no console associated with this process.
1239 * Since the child is a console process, Windows
1240 * would normally create a console window. But
1241 * since we'll be redirecting std streams, we do
1242 * not need the console.
1243 * It is necessary to use DETACHED_PROCESS
1244 * instead of CREATE_NO_WINDOW to make ssh
1245 * recognize that it has no console.
1246 */
1247 flags |= DETACHED_PROCESS;
1248 } else {
1249 /* There is already a console. If we specified
1250 * DETACHED_PROCESS here, too, Windows would
1251 * disassociate the child from the console.
1252 * The same is true for CREATE_NO_WINDOW.
1253 * Go figure!
1254 */
1255 CloseHandle(cons);
1256 }
1257 memset(&si, 0, sizeof(si));
1258 si.cb = sizeof(si);
1259 si.dwFlags = STARTF_USESTDHANDLES;
1260 si.hStdInput = winansi_get_osfhandle(fhin);
1261 si.hStdOutput = winansi_get_osfhandle(fhout);
1262 si.hStdError = winansi_get_osfhandle(fherr);
1263
1264 if (xutftowcs_path(wcmd, cmd) < 0)
1265 return -1;
1266 if (dir && xutftowcs_path(wdir, dir) < 0)
1267 return -1;
1268
1269 /* concatenate argv, quoting args as we go */
1270 strbuf_init(&args, 0);
1271 if (prepend_cmd) {
1272 char *quoted = (char *)quote_arg(cmd);
1273 strbuf_addstr(&args, quoted);
1274 if (quoted != cmd)
1275 free(quoted);
1276 }
1277 for (; *argv; argv++) {
1278 char *quoted = (char *)quote_arg(*argv);
1279 if (*args.buf)
1280 strbuf_addch(&args, ' ');
1281 strbuf_addstr(&args, quoted);
1282 if (quoted != *argv)
1283 free(quoted);
1284 }
1285
1286 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1287 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1288 strbuf_release(&args);
1289
1290 wenvblk = make_environment_block(deltaenv);
1291
1292 memset(&pi, 0, sizeof(pi));
1293 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1294 wenvblk, dir ? wdir : NULL, &si, &pi);
1295
1296 free(wenvblk);
1297 free(wargs);
1298
1299 if (!ret) {
1300 errno = ENOENT;
1301 return -1;
1302 }
1303 CloseHandle(pi.hThread);
1304
1305 /*
1306 * The process ID is the human-readable identifier of the process
1307 * that we want to present in log and error messages. The handle
1308 * is not useful for this purpose. But we cannot close it, either,
1309 * because it is not possible to turn a process ID into a process
1310 * handle after the process terminated.
1311 * Keep the handle in a list for waitpid.
1312 */
1313 EnterCriticalSection(&pinfo_cs);
1314 {
1315 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1316 info->pid = pi.dwProcessId;
1317 info->proc = pi.hProcess;
1318 info->next = pinfo;
1319 pinfo = info;
1320 }
1321 LeaveCriticalSection(&pinfo_cs);
1322
1323 return (pid_t)pi.dwProcessId;
1324 }
1325
1326 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1327 {
1328 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1329 }
1330
1331 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1332 const char *dir,
1333 int fhin, int fhout, int fherr)
1334 {
1335 pid_t pid;
1336 char *prog = path_lookup(cmd, 0);
1337
1338 if (!prog) {
1339 errno = ENOENT;
1340 pid = -1;
1341 }
1342 else {
1343 const char *interpr = parse_interpreter(prog);
1344
1345 if (interpr) {
1346 const char *argv0 = argv[0];
1347 char *iprog = path_lookup(interpr, 1);
1348 argv[0] = prog;
1349 if (!iprog) {
1350 errno = ENOENT;
1351 pid = -1;
1352 }
1353 else {
1354 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1355 fhin, fhout, fherr);
1356 free(iprog);
1357 }
1358 argv[0] = argv0;
1359 }
1360 else
1361 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1362 fhin, fhout, fherr);
1363 free(prog);
1364 }
1365 return pid;
1366 }
1367
1368 static int try_shell_exec(const char *cmd, char *const *argv)
1369 {
1370 const char *interpr = parse_interpreter(cmd);
1371 char *prog;
1372 int pid = 0;
1373
1374 if (!interpr)
1375 return 0;
1376 prog = path_lookup(interpr, 1);
1377 if (prog) {
1378 int argc = 0;
1379 const char **argv2;
1380 while (argv[argc]) argc++;
1381 ALLOC_ARRAY(argv2, argc + 1);
1382 argv2[0] = (char *)cmd; /* full path to the script file */
1383 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1384 pid = mingw_spawnv(prog, argv2, 1);
1385 if (pid >= 0) {
1386 int status;
1387 if (waitpid(pid, &status, 0) < 0)
1388 status = 255;
1389 exit(status);
1390 }
1391 pid = 1; /* indicate that we tried but failed */
1392 free(prog);
1393 free(argv2);
1394 }
1395 return pid;
1396 }
1397
1398 int mingw_execv(const char *cmd, char *const *argv)
1399 {
1400 /* check if git_command is a shell script */
1401 if (!try_shell_exec(cmd, argv)) {
1402 int pid, status;
1403
1404 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1405 if (pid < 0)
1406 return -1;
1407 if (waitpid(pid, &status, 0) < 0)
1408 status = 255;
1409 exit(status);
1410 }
1411 return -1;
1412 }
1413
1414 int mingw_execvp(const char *cmd, char *const *argv)
1415 {
1416 char *prog = path_lookup(cmd, 0);
1417
1418 if (prog) {
1419 mingw_execv(prog, argv);
1420 free(prog);
1421 } else
1422 errno = ENOENT;
1423
1424 return -1;
1425 }
1426
1427 int mingw_kill(pid_t pid, int sig)
1428 {
1429 if (pid > 0 && sig == SIGTERM) {
1430 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1431
1432 if (TerminateProcess(h, -1)) {
1433 CloseHandle(h);
1434 return 0;
1435 }
1436
1437 errno = err_win_to_posix(GetLastError());
1438 CloseHandle(h);
1439 return -1;
1440 } else if (pid > 0 && sig == 0) {
1441 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1442 if (h) {
1443 CloseHandle(h);
1444 return 0;
1445 }
1446 }
1447
1448 errno = EINVAL;
1449 return -1;
1450 }
1451
1452 /*
1453 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1454 */
1455 static int compareenv(const void *v1, const void *v2)
1456 {
1457 const char *e1 = *(const char**)v1;
1458 const char *e2 = *(const char**)v2;
1459
1460 for (;;) {
1461 int c1 = *e1++;
1462 int c2 = *e2++;
1463 c1 = (c1 == '=') ? 0 : tolower(c1);
1464 c2 = (c2 == '=') ? 0 : tolower(c2);
1465 if (c1 > c2)
1466 return 1;
1467 if (c1 < c2)
1468 return -1;
1469 if (c1 == 0)
1470 return 0;
1471 }
1472 }
1473
1474 static int bsearchenv(char **env, const char *name, size_t size)
1475 {
1476 unsigned low = 0, high = size;
1477 while (low < high) {
1478 unsigned mid = low + ((high - low) >> 1);
1479 int cmp = compareenv(&env[mid], &name);
1480 if (cmp < 0)
1481 low = mid + 1;
1482 else if (cmp > 0)
1483 high = mid;
1484 else
1485 return mid;
1486 }
1487 return ~low; /* not found, return 1's complement of insert position */
1488 }
1489
1490 /*
1491 * If name contains '=', then sets the variable, otherwise it unsets it
1492 * Size includes the terminating NULL. Env must have room for size + 1 entries
1493 * (in case of insert). Returns the new size. Optionally frees removed entries.
1494 */
1495 static int do_putenv(char **env, const char *name, int size, int free_old)
1496 {
1497 int i = bsearchenv(env, name, size - 1);
1498
1499 /* optionally free removed / replaced entry */
1500 if (i >= 0 && free_old)
1501 free(env[i]);
1502
1503 if (strchr(name, '=')) {
1504 /* if new value ('key=value') is specified, insert or replace entry */
1505 if (i < 0) {
1506 i = ~i;
1507 memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1508 size++;
1509 }
1510 env[i] = (char*) name;
1511 } else if (i >= 0) {
1512 /* otherwise ('key') remove existing entry */
1513 size--;
1514 memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1515 }
1516 return size;
1517 }
1518
1519 char *mingw_getenv(const char *name)
1520 {
1521 char *value;
1522 int pos = bsearchenv(environ, name, environ_size - 1);
1523 if (pos < 0)
1524 return NULL;
1525 value = strchr(environ[pos], '=');
1526 return value ? &value[1] : NULL;
1527 }
1528
1529 int mingw_putenv(const char *namevalue)
1530 {
1531 ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1532 environ_size = do_putenv(environ, namevalue, environ_size, 1);
1533 return 0;
1534 }
1535
1536 /*
1537 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1538 * that service contains a numerical port, or that it is null. It
1539 * does a simple search using gethostbyname, and returns one IPv4 host
1540 * if one was found.
1541 */
1542 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1543 const struct addrinfo *hints,
1544 struct addrinfo **res)
1545 {
1546 struct hostent *h = NULL;
1547 struct addrinfo *ai;
1548 struct sockaddr_in *sin;
1549
1550 if (node) {
1551 h = gethostbyname(node);
1552 if (!h)
1553 return WSAGetLastError();
1554 }
1555
1556 ai = xmalloc(sizeof(struct addrinfo));
1557 *res = ai;
1558 ai->ai_flags = 0;
1559 ai->ai_family = AF_INET;
1560 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1561 switch (ai->ai_socktype) {
1562 case SOCK_STREAM:
1563 ai->ai_protocol = IPPROTO_TCP;
1564 break;
1565 case SOCK_DGRAM:
1566 ai->ai_protocol = IPPROTO_UDP;
1567 break;
1568 default:
1569 ai->ai_protocol = 0;
1570 break;
1571 }
1572 ai->ai_addrlen = sizeof(struct sockaddr_in);
1573 if (hints && (hints->ai_flags & AI_CANONNAME))
1574 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1575 else
1576 ai->ai_canonname = NULL;
1577
1578 sin = xcalloc(1, ai->ai_addrlen);
1579 sin->sin_family = AF_INET;
1580 /* Note: getaddrinfo is supposed to allow service to be a string,
1581 * which should be looked up using getservbyname. This is
1582 * currently not implemented */
1583 if (service)
1584 sin->sin_port = htons(atoi(service));
1585 if (h)
1586 sin->sin_addr = *(struct in_addr *)h->h_addr;
1587 else if (hints && (hints->ai_flags & AI_PASSIVE))
1588 sin->sin_addr.s_addr = INADDR_ANY;
1589 else
1590 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1591 ai->ai_addr = (struct sockaddr *)sin;
1592 ai->ai_next = NULL;
1593 return 0;
1594 }
1595
1596 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1597 {
1598 free(res->ai_canonname);
1599 free(res->ai_addr);
1600 free(res);
1601 }
1602
1603 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1604 char *host, DWORD hostlen,
1605 char *serv, DWORD servlen, int flags)
1606 {
1607 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1608 if (sa->sa_family != AF_INET)
1609 return EAI_FAMILY;
1610 if (!host && !serv)
1611 return EAI_NONAME;
1612
1613 if (host && hostlen > 0) {
1614 struct hostent *ent = NULL;
1615 if (!(flags & NI_NUMERICHOST))
1616 ent = gethostbyaddr((const char *)&sin->sin_addr,
1617 sizeof(sin->sin_addr), AF_INET);
1618
1619 if (ent)
1620 snprintf(host, hostlen, "%s", ent->h_name);
1621 else if (flags & NI_NAMEREQD)
1622 return EAI_NONAME;
1623 else
1624 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1625 }
1626
1627 if (serv && servlen > 0) {
1628 struct servent *ent = NULL;
1629 if (!(flags & NI_NUMERICSERV))
1630 ent = getservbyport(sin->sin_port,
1631 flags & NI_DGRAM ? "udp" : "tcp");
1632
1633 if (ent)
1634 snprintf(serv, servlen, "%s", ent->s_name);
1635 else
1636 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1637 }
1638
1639 return 0;
1640 }
1641
1642 static HMODULE ipv6_dll = NULL;
1643 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1644 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1645 const struct addrinfo *hints,
1646 struct addrinfo **res);
1647 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1648 char *host, DWORD hostlen,
1649 char *serv, DWORD servlen, int flags);
1650 /*
1651 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1652 * don't need to try to load that one dynamically.
1653 */
1654
1655 static void socket_cleanup(void)
1656 {
1657 WSACleanup();
1658 if (ipv6_dll)
1659 FreeLibrary(ipv6_dll);
1660 ipv6_dll = NULL;
1661 ipv6_freeaddrinfo = freeaddrinfo_stub;
1662 ipv6_getaddrinfo = getaddrinfo_stub;
1663 ipv6_getnameinfo = getnameinfo_stub;
1664 }
1665
1666 static void ensure_socket_initialization(void)
1667 {
1668 WSADATA wsa;
1669 static int initialized = 0;
1670 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1671 const char **name;
1672
1673 if (initialized)
1674 return;
1675
1676 if (WSAStartup(MAKEWORD(2,2), &wsa))
1677 die("unable to initialize winsock subsystem, error %d",
1678 WSAGetLastError());
1679
1680 for (name = libraries; *name; name++) {
1681 ipv6_dll = LoadLibraryExA(*name, NULL,
1682 LOAD_LIBRARY_SEARCH_SYSTEM32);
1683 if (!ipv6_dll)
1684 continue;
1685
1686 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1687 GetProcAddress(ipv6_dll, "freeaddrinfo");
1688 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1689 const struct addrinfo *,
1690 struct addrinfo **))
1691 GetProcAddress(ipv6_dll, "getaddrinfo");
1692 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1693 socklen_t, char *, DWORD,
1694 char *, DWORD, int))
1695 GetProcAddress(ipv6_dll, "getnameinfo");
1696 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1697 FreeLibrary(ipv6_dll);
1698 ipv6_dll = NULL;
1699 } else
1700 break;
1701 }
1702 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1703 ipv6_freeaddrinfo = freeaddrinfo_stub;
1704 ipv6_getaddrinfo = getaddrinfo_stub;
1705 ipv6_getnameinfo = getnameinfo_stub;
1706 }
1707
1708 atexit(socket_cleanup);
1709 initialized = 1;
1710 }
1711
1712 #undef gethostname
1713 int mingw_gethostname(char *name, int namelen)
1714 {
1715 ensure_socket_initialization();
1716 return gethostname(name, namelen);
1717 }
1718
1719 #undef gethostbyname
1720 struct hostent *mingw_gethostbyname(const char *host)
1721 {
1722 ensure_socket_initialization();
1723 return gethostbyname(host);
1724 }
1725
1726 void mingw_freeaddrinfo(struct addrinfo *res)
1727 {
1728 ipv6_freeaddrinfo(res);
1729 }
1730
1731 int mingw_getaddrinfo(const char *node, const char *service,
1732 const struct addrinfo *hints, struct addrinfo **res)
1733 {
1734 ensure_socket_initialization();
1735 return ipv6_getaddrinfo(node, service, hints, res);
1736 }
1737
1738 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1739 char *host, DWORD hostlen, char *serv, DWORD servlen,
1740 int flags)
1741 {
1742 ensure_socket_initialization();
1743 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1744 }
1745
1746 int mingw_socket(int domain, int type, int protocol)
1747 {
1748 int sockfd;
1749 SOCKET s;
1750
1751 ensure_socket_initialization();
1752 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1753 if (s == INVALID_SOCKET) {
1754 /*
1755 * WSAGetLastError() values are regular BSD error codes
1756 * biased by WSABASEERR.
1757 * However, strerror() does not know about networking
1758 * specific errors, which are values beginning at 38 or so.
1759 * Therefore, we choose to leave the biased error code
1760 * in errno so that _if_ someone looks up the code somewhere,
1761 * then it is at least the number that are usually listed.
1762 */
1763 errno = WSAGetLastError();
1764 return -1;
1765 }
1766 /* convert into a file descriptor */
1767 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1768 closesocket(s);
1769 return error("unable to make a socket file descriptor: %s",
1770 strerror(errno));
1771 }
1772 return sockfd;
1773 }
1774
1775 #undef connect
1776 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1777 {
1778 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1779 return connect(s, sa, sz);
1780 }
1781
1782 #undef bind
1783 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1784 {
1785 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1786 return bind(s, sa, sz);
1787 }
1788
1789 #undef setsockopt
1790 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1791 {
1792 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1793 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1794 }
1795
1796 #undef shutdown
1797 int mingw_shutdown(int sockfd, int how)
1798 {
1799 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1800 return shutdown(s, how);
1801 }
1802
1803 #undef listen
1804 int mingw_listen(int sockfd, int backlog)
1805 {
1806 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1807 return listen(s, backlog);
1808 }
1809
1810 #undef accept
1811 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1812 {
1813 int sockfd2;
1814
1815 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1816 SOCKET s2 = accept(s1, sa, sz);
1817
1818 /* convert into a file descriptor */
1819 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1820 int err = errno;
1821 closesocket(s2);
1822 return error("unable to make a socket file descriptor: %s",
1823 strerror(err));
1824 }
1825 return sockfd2;
1826 }
1827
1828 #undef rename
1829 int mingw_rename(const char *pold, const char *pnew)
1830 {
1831 DWORD attrs, gle;
1832 int tries = 0;
1833 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1834 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1835 return -1;
1836
1837 /*
1838 * Try native rename() first to get errno right.
1839 * It is based on MoveFile(), which cannot overwrite existing files.
1840 */
1841 if (!_wrename(wpold, wpnew))
1842 return 0;
1843 if (errno != EEXIST)
1844 return -1;
1845 repeat:
1846 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1847 return 0;
1848 /* TODO: translate more errors */
1849 gle = GetLastError();
1850 if (gle == ERROR_ACCESS_DENIED &&
1851 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1852 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1853 DWORD attrsold = GetFileAttributesW(wpold);
1854 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1855 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1856 errno = EISDIR;
1857 else if (!_wrmdir(wpnew))
1858 goto repeat;
1859 return -1;
1860 }
1861 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1862 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1863 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1864 return 0;
1865 gle = GetLastError();
1866 /* revert file attributes on failure */
1867 SetFileAttributesW(wpnew, attrs);
1868 }
1869 }
1870 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1871 /*
1872 * We assume that some other process had the source or
1873 * destination file open at the wrong moment and retry.
1874 * In order to give the other process a higher chance to
1875 * complete its operation, we give up our time slice now.
1876 * If we have to retry again, we do sleep a bit.
1877 */
1878 Sleep(delay[tries]);
1879 tries++;
1880 goto repeat;
1881 }
1882 if (gle == ERROR_ACCESS_DENIED &&
1883 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1884 "Should I try again?", pold, pnew))
1885 goto repeat;
1886
1887 errno = EACCES;
1888 return -1;
1889 }
1890
1891 /*
1892 * Note that this doesn't return the actual pagesize, but
1893 * the allocation granularity. If future Windows specific git code
1894 * needs the real getpagesize function, we need to find another solution.
1895 */
1896 int mingw_getpagesize(void)
1897 {
1898 SYSTEM_INFO si;
1899 GetSystemInfo(&si);
1900 return si.dwAllocationGranularity;
1901 }
1902
1903 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
1904 enum EXTENDED_NAME_FORMAT {
1905 NameDisplay = 3,
1906 NameUserPrincipal = 8
1907 };
1908
1909 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
1910 {
1911 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
1912 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
1913 static wchar_t wbuffer[1024];
1914 DWORD len;
1915
1916 if (!INIT_PROC_ADDR(GetUserNameExW))
1917 return NULL;
1918
1919 len = ARRAY_SIZE(wbuffer);
1920 if (GetUserNameExW(type, wbuffer, &len)) {
1921 char *converted = xmalloc((len *= 3));
1922 if (xwcstoutf(converted, wbuffer, len) >= 0)
1923 return converted;
1924 free(converted);
1925 }
1926
1927 return NULL;
1928 }
1929
1930 char *mingw_query_user_email(void)
1931 {
1932 return get_extended_user_info(NameUserPrincipal);
1933 }
1934
1935 struct passwd *getpwuid(int uid)
1936 {
1937 static unsigned initialized;
1938 static char user_name[100];
1939 static struct passwd *p;
1940 DWORD len;
1941
1942 if (initialized)
1943 return p;
1944
1945 len = sizeof(user_name);
1946 if (!GetUserName(user_name, &len)) {
1947 initialized = 1;
1948 return NULL;
1949 }
1950
1951 p = xmalloc(sizeof(*p));
1952 p->pw_name = user_name;
1953 p->pw_gecos = get_extended_user_info(NameDisplay);
1954 if (!p->pw_gecos)
1955 p->pw_gecos = "unknown";
1956 p->pw_dir = NULL;
1957
1958 initialized = 1;
1959 return p;
1960 }
1961
1962 static HANDLE timer_event;
1963 static HANDLE timer_thread;
1964 static int timer_interval;
1965 static int one_shot;
1966 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1967
1968 /* The timer works like this:
1969 * The thread, ticktack(), is a trivial routine that most of the time
1970 * only waits to receive the signal to terminate. The main thread tells
1971 * the thread to terminate by setting the timer_event to the signalled
1972 * state.
1973 * But ticktack() interrupts the wait state after the timer's interval
1974 * length to call the signal handler.
1975 */
1976
1977 static unsigned __stdcall ticktack(void *dummy)
1978 {
1979 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1980 mingw_raise(SIGALRM);
1981 if (one_shot)
1982 break;
1983 }
1984 return 0;
1985 }
1986
1987 static int start_timer_thread(void)
1988 {
1989 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1990 if (timer_event) {
1991 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1992 if (!timer_thread )
1993 return errno = ENOMEM,
1994 error("cannot start timer thread");
1995 } else
1996 return errno = ENOMEM,
1997 error("cannot allocate resources for timer");
1998 return 0;
1999 }
2000
2001 static void stop_timer_thread(void)
2002 {
2003 if (timer_event)
2004 SetEvent(timer_event); /* tell thread to terminate */
2005 if (timer_thread) {
2006 int rc = WaitForSingleObject(timer_thread, 1000);
2007 if (rc == WAIT_TIMEOUT)
2008 error("timer thread did not terminate timely");
2009 else if (rc != WAIT_OBJECT_0)
2010 error("waiting for timer thread failed: %lu",
2011 GetLastError());
2012 CloseHandle(timer_thread);
2013 }
2014 if (timer_event)
2015 CloseHandle(timer_event);
2016 timer_event = NULL;
2017 timer_thread = NULL;
2018 }
2019
2020 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2021 {
2022 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2023 }
2024
2025 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2026 {
2027 static const struct timeval zero;
2028 static int atexit_done;
2029
2030 if (out != NULL)
2031 return errno = EINVAL,
2032 error("setitimer param 3 != NULL not implemented");
2033 if (!is_timeval_eq(&in->it_interval, &zero) &&
2034 !is_timeval_eq(&in->it_interval, &in->it_value))
2035 return errno = EINVAL,
2036 error("setitimer: it_interval must be zero or eq it_value");
2037
2038 if (timer_thread)
2039 stop_timer_thread();
2040
2041 if (is_timeval_eq(&in->it_value, &zero) &&
2042 is_timeval_eq(&in->it_interval, &zero))
2043 return 0;
2044
2045 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2046 one_shot = is_timeval_eq(&in->it_interval, &zero);
2047 if (!atexit_done) {
2048 atexit(stop_timer_thread);
2049 atexit_done = 1;
2050 }
2051 return start_timer_thread();
2052 }
2053
2054 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2055 {
2056 if (sig != SIGALRM)
2057 return errno = EINVAL,
2058 error("sigaction only implemented for SIGALRM");
2059 if (out != NULL)
2060 return errno = EINVAL,
2061 error("sigaction: param 3 != NULL not implemented");
2062
2063 timer_fn = in->sa_handler;
2064 return 0;
2065 }
2066
2067 #undef signal
2068 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2069 {
2070 sig_handler_t old;
2071
2072 switch (sig) {
2073 case SIGALRM:
2074 old = timer_fn;
2075 timer_fn = handler;
2076 break;
2077
2078 case SIGINT:
2079 old = sigint_fn;
2080 sigint_fn = handler;
2081 break;
2082
2083 default:
2084 return signal(sig, handler);
2085 }
2086
2087 return old;
2088 }
2089
2090 #undef raise
2091 int mingw_raise(int sig)
2092 {
2093 switch (sig) {
2094 case SIGALRM:
2095 if (timer_fn == SIG_DFL) {
2096 if (isatty(STDERR_FILENO))
2097 fputs("Alarm clock\n", stderr);
2098 exit(128 + SIGALRM);
2099 } else if (timer_fn != SIG_IGN)
2100 timer_fn(SIGALRM);
2101 return 0;
2102
2103 case SIGINT:
2104 if (sigint_fn == SIG_DFL)
2105 exit(128 + SIGINT);
2106 else if (sigint_fn != SIG_IGN)
2107 sigint_fn(SIGINT);
2108 return 0;
2109
2110 default:
2111 return raise(sig);
2112 }
2113 }
2114
2115 int link(const char *oldpath, const char *newpath)
2116 {
2117 typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
2118 static T create_hard_link = NULL;
2119 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2120 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2121 xutftowcs_path(wnewpath, newpath) < 0)
2122 return -1;
2123
2124 if (!create_hard_link) {
2125 create_hard_link = (T) GetProcAddress(
2126 GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
2127 if (!create_hard_link)
2128 create_hard_link = (T)-1;
2129 }
2130 if (create_hard_link == (T)-1) {
2131 errno = ENOSYS;
2132 return -1;
2133 }
2134 if (!create_hard_link(wnewpath, woldpath, NULL)) {
2135 errno = err_win_to_posix(GetLastError());
2136 return -1;
2137 }
2138 return 0;
2139 }
2140
2141 pid_t waitpid(pid_t pid, int *status, int options)
2142 {
2143 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2144 FALSE, pid);
2145 if (!h) {
2146 errno = ECHILD;
2147 return -1;
2148 }
2149
2150 if (pid > 0 && options & WNOHANG) {
2151 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2152 CloseHandle(h);
2153 return 0;
2154 }
2155 options &= ~WNOHANG;
2156 }
2157
2158 if (options == 0) {
2159 struct pinfo_t **ppinfo;
2160 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2161 CloseHandle(h);
2162 return 0;
2163 }
2164
2165 if (status)
2166 GetExitCodeProcess(h, (LPDWORD)status);
2167
2168 EnterCriticalSection(&pinfo_cs);
2169
2170 ppinfo = &pinfo;
2171 while (*ppinfo) {
2172 struct pinfo_t *info = *ppinfo;
2173 if (info->pid == pid) {
2174 CloseHandle(info->proc);
2175 *ppinfo = info->next;
2176 free(info);
2177 break;
2178 }
2179 ppinfo = &info->next;
2180 }
2181
2182 LeaveCriticalSection(&pinfo_cs);
2183
2184 CloseHandle(h);
2185 return pid;
2186 }
2187 CloseHandle(h);
2188
2189 errno = EINVAL;
2190 return -1;
2191 }
2192
2193 int mingw_skip_dos_drive_prefix(char **path)
2194 {
2195 int ret = has_dos_drive_prefix(*path);
2196 *path += ret;
2197 return ret;
2198 }
2199
2200 int mingw_offset_1st_component(const char *path)
2201 {
2202 char *pos = (char *)path;
2203
2204 /* unc paths */
2205 if (!skip_dos_drive_prefix(&pos) &&
2206 is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2207 /* skip server name */
2208 pos = strpbrk(pos + 2, "\\/");
2209 if (!pos)
2210 return 0; /* Error: malformed unc path */
2211
2212 do {
2213 pos++;
2214 } while (*pos && !is_dir_sep(*pos));
2215 }
2216
2217 return pos + is_dir_sep(*pos) - path;
2218 }
2219
2220 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2221 {
2222 int upos = 0, wpos = 0;
2223 const unsigned char *utf = (const unsigned char*) utfs;
2224 if (!utf || !wcs || wcslen < 1) {
2225 errno = EINVAL;
2226 return -1;
2227 }
2228 /* reserve space for \0 */
2229 wcslen--;
2230 if (utflen < 0)
2231 utflen = INT_MAX;
2232
2233 while (upos < utflen) {
2234 int c = utf[upos++] & 0xff;
2235 if (utflen == INT_MAX && c == 0)
2236 break;
2237
2238 if (wpos >= wcslen) {
2239 wcs[wpos] = 0;
2240 errno = ERANGE;
2241 return -1;
2242 }
2243
2244 if (c < 0x80) {
2245 /* ASCII */
2246 wcs[wpos++] = c;
2247 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2248 (utf[upos] & 0xc0) == 0x80) {
2249 /* 2-byte utf-8 */
2250 c = ((c & 0x1f) << 6);
2251 c |= (utf[upos++] & 0x3f);
2252 wcs[wpos++] = c;
2253 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2254 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2255 (utf[upos] & 0xc0) == 0x80 &&
2256 (utf[upos + 1] & 0xc0) == 0x80) {
2257 /* 3-byte utf-8 */
2258 c = ((c & 0x0f) << 12);
2259 c |= ((utf[upos++] & 0x3f) << 6);
2260 c |= (utf[upos++] & 0x3f);
2261 wcs[wpos++] = c;
2262 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2263 wpos + 1 < wcslen &&
2264 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2265 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2266 (utf[upos] & 0xc0) == 0x80 &&
2267 (utf[upos + 1] & 0xc0) == 0x80 &&
2268 (utf[upos + 2] & 0xc0) == 0x80) {
2269 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2270 c = ((c & 0x07) << 18);
2271 c |= ((utf[upos++] & 0x3f) << 12);
2272 c |= ((utf[upos++] & 0x3f) << 6);
2273 c |= (utf[upos++] & 0x3f);
2274 c -= 0x10000;
2275 wcs[wpos++] = 0xd800 | (c >> 10);
2276 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2277 } else if (c >= 0xa0) {
2278 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2279 wcs[wpos++] = c;
2280 } else {
2281 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2282 static const char *hex = "0123456789abcdef";
2283 wcs[wpos++] = hex[c >> 4];
2284 if (wpos < wcslen)
2285 wcs[wpos++] = hex[c & 0x0f];
2286 }
2287 }
2288 wcs[wpos] = 0;
2289 return wpos;
2290 }
2291
2292 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2293 {
2294 if (!wcs || !utf || utflen < 1) {
2295 errno = EINVAL;
2296 return -1;
2297 }
2298 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2299 if (utflen)
2300 return utflen - 1;
2301 errno = ERANGE;
2302 return -1;
2303 }
2304
2305 static void setup_windows_environment(void)
2306 {
2307 char *tmp = getenv("TMPDIR");
2308
2309 /* on Windows it is TMP and TEMP */
2310 if (!tmp) {
2311 if (!(tmp = getenv("TMP")))
2312 tmp = getenv("TEMP");
2313 if (tmp) {
2314 setenv("TMPDIR", tmp, 1);
2315 tmp = getenv("TMPDIR");
2316 }
2317 }
2318
2319 if (tmp) {
2320 /*
2321 * Convert all dir separators to forward slashes,
2322 * to help shell commands called from the Git
2323 * executable (by not mistaking the dir separators
2324 * for escape characters).
2325 */
2326 convert_slashes(tmp);
2327 }
2328
2329 /* simulate TERM to enable auto-color (see color.c) */
2330 if (!getenv("TERM"))
2331 setenv("TERM", "cygwin", 1);
2332 }
2333
2334 /*
2335 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2336 * mingw startup code, see init.c in mingw runtime).
2337 */
2338 int _CRT_glob = 0;
2339
2340 typedef struct {
2341 int newmode;
2342 } _startupinfo;
2343
2344 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2345 _startupinfo *si);
2346
2347 static NORETURN void die_startup(void)
2348 {
2349 fputs("fatal: not enough memory for initialization", stderr);
2350 exit(128);
2351 }
2352
2353 static void *malloc_startup(size_t size)
2354 {
2355 void *result = malloc(size);
2356 if (!result)
2357 die_startup();
2358 return result;
2359 }
2360
2361 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2362 {
2363 len = xwcstoutf(buffer, wcs, len) + 1;
2364 return memcpy(malloc_startup(len), buffer, len);
2365 }
2366
2367 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2368 DWORD desired_access, DWORD flags)
2369 {
2370 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2371 wchar_t buf[MAX_PATH];
2372 DWORD max = ARRAY_SIZE(buf);
2373 HANDLE handle;
2374 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2375
2376 if (!ret || ret >= max)
2377 return;
2378
2379 /* make sure this does not leak into child processes */
2380 SetEnvironmentVariableW(key, NULL);
2381 if (!wcscmp(buf, L"off")) {
2382 close(fd);
2383 handle = GetStdHandle(std_id);
2384 if (handle != INVALID_HANDLE_VALUE)
2385 CloseHandle(handle);
2386 return;
2387 }
2388 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2389 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2390 if (handle == INVALID_HANDLE_VALUE) {
2391 close(fd);
2392 handle = GetStdHandle(std_id);
2393 if (handle != INVALID_HANDLE_VALUE)
2394 CloseHandle(handle);
2395 } else {
2396 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2397 SetStdHandle(std_id, handle);
2398 dup2(new_fd, fd);
2399 /* do *not* close the new_fd: that would close stdout */
2400 }
2401 return;
2402 }
2403 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2404 flags, NULL);
2405 if (handle != INVALID_HANDLE_VALUE) {
2406 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2407 SetStdHandle(std_id, handle);
2408 dup2(new_fd, fd);
2409 close(new_fd);
2410 }
2411 }
2412
2413 static void maybe_redirect_std_handles(void)
2414 {
2415 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2416 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2417 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2418 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2419 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2420 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2421 }
2422
2423 void mingw_startup(void)
2424 {
2425 int i, maxlen, argc;
2426 char *buffer;
2427 wchar_t **wenv, **wargv;
2428 _startupinfo si;
2429
2430 maybe_redirect_std_handles();
2431
2432 /* get wide char arguments and environment */
2433 si.newmode = 0;
2434 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2435 die_startup();
2436
2437 /* determine size of argv and environ conversion buffer */
2438 maxlen = wcslen(wargv[0]);
2439 for (i = 1; i < argc; i++)
2440 maxlen = max(maxlen, wcslen(wargv[i]));
2441 for (i = 0; wenv[i]; i++)
2442 maxlen = max(maxlen, wcslen(wenv[i]));
2443
2444 /*
2445 * nedmalloc can't free CRT memory, allocate resizable environment
2446 * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2447 * use it while initializing the environment itself.
2448 */
2449 environ_size = i + 1;
2450 environ_alloc = alloc_nr(environ_size * sizeof(char*));
2451 environ = malloc_startup(environ_alloc);
2452
2453 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2454 maxlen = 3 * maxlen + 1;
2455 buffer = malloc_startup(maxlen);
2456
2457 /* convert command line arguments and environment to UTF-8 */
2458 for (i = 0; i < argc; i++)
2459 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2460 for (i = 0; wenv[i]; i++)
2461 environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2462 environ[i] = NULL;
2463 free(buffer);
2464
2465 /* sort environment for O(log n) getenv / putenv */
2466 qsort(environ, i, sizeof(char*), compareenv);
2467
2468 /* fix Windows specific environment settings */
2469 setup_windows_environment();
2470
2471 unset_environment_variables = xstrdup("PERL5LIB");
2472
2473 /* initialize critical section for waitpid pinfo_t list */
2474 InitializeCriticalSection(&pinfo_cs);
2475
2476 /* set up default file mode and file modes for stdin/out/err */
2477 _fmode = _O_BINARY;
2478 _setmode(_fileno(stdin), _O_BINARY);
2479 _setmode(_fileno(stdout), _O_BINARY);
2480 _setmode(_fileno(stderr), _O_BINARY);
2481
2482 /* initialize Unicode console */
2483 winansi_init();
2484 }
2485
2486 int uname(struct utsname *buf)
2487 {
2488 unsigned v = (unsigned)GetVersion();
2489 memset(buf, 0, sizeof(*buf));
2490 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2491 xsnprintf(buf->release, sizeof(buf->release),
2492 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2493 /* assuming NT variants only.. */
2494 xsnprintf(buf->version, sizeof(buf->version),
2495 "%u", (v >> 16) & 0x7fff);
2496 return 0;
2497 }