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Commit | Line | Data |
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112db553 LT |
1 | /* |
2 | * Various trivial helper wrappers around standard functions | |
3 | */ | |
5e3f94df | 4 | #include "git-compat-util.h" |
0b027f6c | 5 | #include "abspath.h" |
b2141fc1 | 6 | #include "config.h" |
f394e093 | 7 | #include "gettext.h" |
5e3f94df | 8 | #include "object.h" |
d1cbe1e6 | 9 | #include "repository.h" |
69a63fe6 | 10 | #include "strbuf.h" |
74ea5c95 | 11 | #include "trace2.h" |
d5ebb50d | 12 | #include "wrapper.h" |
112db553 | 13 | |
9a498767 NS |
14 | static intmax_t count_fsync_writeout_only; |
15 | static intmax_t count_fsync_hardware_flush; | |
16 | ||
19d3f228 NS |
17 | #ifdef HAVE_RTLGENRANDOM |
18 | /* This is required to get access to RtlGenRandom. */ | |
19 | #define SystemFunction036 NTAPI SystemFunction036 | |
20 | #include <NTSecAPI.h> | |
21 | #undef SystemFunction036 | |
22 | #endif | |
23 | ||
f8bb1d94 | 24 | static int memory_limit_check(size_t size, int gentle) |
d41489a6 | 25 | { |
9927d962 SP |
26 | static size_t limit = 0; |
27 | if (!limit) { | |
28 | limit = git_env_ulong("GIT_ALLOC_LIMIT", 0); | |
29 | if (!limit) | |
30 | limit = SIZE_MAX; | |
d41489a6 | 31 | } |
f0d89001 | 32 | if (size > limit) { |
f8bb1d94 | 33 | if (gentle) { |
f0d89001 JH |
34 | error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
35 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
36 | return -1; |
37 | } else | |
f0d89001 JH |
38 | die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
39 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
40 | } |
41 | return 0; | |
d41489a6 NTND |
42 | } |
43 | ||
112db553 LT |
44 | char *xstrdup(const char *str) |
45 | { | |
46 | char *ret = strdup(str); | |
9827d4c1 JK |
47 | if (!ret) |
48 | die("Out of memory, strdup failed"); | |
112db553 LT |
49 | return ret; |
50 | } | |
51 | ||
f8bb1d94 | 52 | static void *do_xmalloc(size_t size, int gentle) |
112db553 | 53 | { |
d41489a6 NTND |
54 | void *ret; |
55 | ||
f8bb1d94 NTND |
56 | if (memory_limit_check(size, gentle)) |
57 | return NULL; | |
d41489a6 | 58 | ret = malloc(size); |
112db553 LT |
59 | if (!ret && !size) |
60 | ret = malloc(1); | |
61 | if (!ret) { | |
9827d4c1 JK |
62 | if (!gentle) |
63 | die("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
64 | (unsigned long)size); | |
65 | else { | |
66 | error("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
67 | (unsigned long)size); | |
68 | return NULL; | |
f8bb1d94 | 69 | } |
112db553 LT |
70 | } |
71 | #ifdef XMALLOC_POISON | |
72 | memset(ret, 0xA5, size); | |
73 | #endif | |
74 | return ret; | |
75 | } | |
76 | ||
f8bb1d94 NTND |
77 | void *xmalloc(size_t size) |
78 | { | |
79 | return do_xmalloc(size, 0); | |
80 | } | |
81 | ||
82 | static void *do_xmallocz(size_t size, int gentle) | |
5bf9219d IL |
83 | { |
84 | void *ret; | |
f8bb1d94 NTND |
85 | if (unsigned_add_overflows(size, 1)) { |
86 | if (gentle) { | |
87 | error("Data too large to fit into virtual memory space."); | |
88 | return NULL; | |
89 | } else | |
90 | die("Data too large to fit into virtual memory space."); | |
91 | } | |
92 | ret = do_xmalloc(size + 1, gentle); | |
93 | if (ret) | |
94 | ((char*)ret)[size] = 0; | |
5bf9219d IL |
95 | return ret; |
96 | } | |
97 | ||
f8bb1d94 NTND |
98 | void *xmallocz(size_t size) |
99 | { | |
100 | return do_xmallocz(size, 0); | |
101 | } | |
102 | ||
103 | void *xmallocz_gently(size_t size) | |
104 | { | |
105 | return do_xmallocz(size, 1); | |
106 | } | |
107 | ||
112db553 LT |
108 | /* |
109 | * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of | |
110 | * "data" to the allocated memory, zero terminates the allocated memory, | |
111 | * and returns a pointer to the allocated memory. If the allocation fails, | |
112 | * the program dies. | |
113 | */ | |
114 | void *xmemdupz(const void *data, size_t len) | |
115 | { | |
5bf9219d | 116 | return memcpy(xmallocz(len), data, len); |
112db553 LT |
117 | } |
118 | ||
119 | char *xstrndup(const char *str, size_t len) | |
120 | { | |
121 | char *p = memchr(str, '\0', len); | |
122 | return xmemdupz(str, p ? p - str : len); | |
123 | } | |
124 | ||
14570dc6 | 125 | int xstrncmpz(const char *s, const char *t, size_t len) |
126 | { | |
127 | int res = strncmp(s, t, len); | |
128 | if (res) | |
129 | return res; | |
130 | return s[len] == '\0' ? 0 : 1; | |
131 | } | |
132 | ||
112db553 LT |
133 | void *xrealloc(void *ptr, size_t size) |
134 | { | |
d41489a6 NTND |
135 | void *ret; |
136 | ||
6479ea4a JK |
137 | if (!size) { |
138 | free(ptr); | |
139 | return xmalloc(0); | |
140 | } | |
141 | ||
f8bb1d94 | 142 | memory_limit_check(size, 0); |
d41489a6 | 143 | ret = realloc(ptr, size); |
9827d4c1 JK |
144 | if (!ret) |
145 | die("Out of memory, realloc failed"); | |
112db553 LT |
146 | return ret; |
147 | } | |
148 | ||
149 | void *xcalloc(size_t nmemb, size_t size) | |
150 | { | |
d41489a6 NTND |
151 | void *ret; |
152 | ||
e7792a74 JK |
153 | if (unsigned_mult_overflows(nmemb, size)) |
154 | die("data too large to fit into virtual memory space"); | |
155 | ||
f8bb1d94 | 156 | memory_limit_check(size * nmemb, 0); |
d41489a6 | 157 | ret = calloc(nmemb, size); |
112db553 LT |
158 | if (!ret && (!nmemb || !size)) |
159 | ret = calloc(1, 1); | |
9827d4c1 JK |
160 | if (!ret) |
161 | die("Out of memory, calloc failed"); | |
112db553 LT |
162 | return ret; |
163 | } | |
164 | ||
3540c71e ÆAB |
165 | void xsetenv(const char *name, const char *value, int overwrite) |
166 | { | |
167 | if (setenv(name, value, overwrite)) | |
168 | die_errno(_("could not setenv '%s'"), name ? name : "(null)"); | |
169 | } | |
170 | ||
3ff53df7 PT |
171 | /** |
172 | * xopen() is the same as open(), but it die()s if the open() fails. | |
173 | */ | |
174 | int xopen(const char *path, int oflag, ...) | |
175 | { | |
176 | mode_t mode = 0; | |
177 | va_list ap; | |
178 | ||
179 | /* | |
180 | * va_arg() will have undefined behavior if the specified type is not | |
181 | * compatible with the argument type. Since integers are promoted to | |
182 | * ints, we fetch the next argument as an int, and then cast it to a | |
183 | * mode_t to avoid undefined behavior. | |
184 | */ | |
185 | va_start(ap, oflag); | |
186 | if (oflag & O_CREAT) | |
187 | mode = va_arg(ap, int); | |
188 | va_end(ap); | |
189 | ||
190 | for (;;) { | |
191 | int fd = open(path, oflag, mode); | |
192 | if (fd >= 0) | |
193 | return fd; | |
194 | if (errno == EINTR) | |
195 | continue; | |
196 | ||
a7439d0f RS |
197 | if ((oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
198 | die_errno(_("unable to create '%s'"), path); | |
199 | else if ((oflag & O_RDWR) == O_RDWR) | |
3ff53df7 PT |
200 | die_errno(_("could not open '%s' for reading and writing"), path); |
201 | else if ((oflag & O_WRONLY) == O_WRONLY) | |
202 | die_errno(_("could not open '%s' for writing"), path); | |
203 | else | |
204 | die_errno(_("could not open '%s' for reading"), path); | |
205 | } | |
206 | } | |
207 | ||
d751dd11 EW |
208 | static int handle_nonblock(int fd, short poll_events, int err) |
209 | { | |
210 | struct pollfd pfd; | |
211 | ||
212 | if (err != EAGAIN && err != EWOULDBLOCK) | |
213 | return 0; | |
214 | ||
215 | pfd.fd = fd; | |
216 | pfd.events = poll_events; | |
217 | ||
218 | /* | |
219 | * no need to check for errors, here; | |
220 | * a subsequent read/write will detect unrecoverable errors | |
221 | */ | |
222 | poll(&pfd, 1, -1); | |
223 | return 1; | |
224 | } | |
225 | ||
112db553 LT |
226 | /* |
227 | * xread() is the same a read(), but it automatically restarts read() | |
228 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
229 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
230 | */ | |
231 | ssize_t xread(int fd, void *buf, size_t len) | |
232 | { | |
233 | ssize_t nr; | |
0b6806b9 | 234 | if (len > MAX_IO_SIZE) |
7cd54d37 | 235 | len = MAX_IO_SIZE; |
112db553 LT |
236 | while (1) { |
237 | nr = read(fd, buf, len); | |
1079c4be SB |
238 | if (nr < 0) { |
239 | if (errno == EINTR) | |
240 | continue; | |
d751dd11 | 241 | if (handle_nonblock(fd, POLLIN, errno)) |
c22f6202 | 242 | continue; |
1079c4be | 243 | } |
112db553 LT |
244 | return nr; |
245 | } | |
246 | } | |
247 | ||
248 | /* | |
249 | * xwrite() is the same a write(), but it automatically restarts write() | |
250 | * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT | |
251 | * GUARANTEE that "len" bytes is written even if the operation is successful. | |
252 | */ | |
253 | ssize_t xwrite(int fd, const void *buf, size_t len) | |
254 | { | |
255 | ssize_t nr; | |
0b6806b9 | 256 | if (len > MAX_IO_SIZE) |
7cd54d37 | 257 | len = MAX_IO_SIZE; |
112db553 LT |
258 | while (1) { |
259 | nr = write(fd, buf, len); | |
ef1cf016 EW |
260 | if (nr < 0) { |
261 | if (errno == EINTR) | |
262 | continue; | |
d751dd11 | 263 | if (handle_nonblock(fd, POLLOUT, errno)) |
ef1cf016 | 264 | continue; |
ef1cf016 EW |
265 | } |
266 | ||
9aa91af0 YM |
267 | return nr; |
268 | } | |
269 | } | |
270 | ||
271 | /* | |
272 | * xpread() is the same as pread(), but it automatically restarts pread() | |
273 | * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES | |
274 | * NOT GUARANTEE that "len" bytes is read even if the data is available. | |
275 | */ | |
276 | ssize_t xpread(int fd, void *buf, size_t len, off_t offset) | |
277 | { | |
278 | ssize_t nr; | |
279 | if (len > MAX_IO_SIZE) | |
280 | len = MAX_IO_SIZE; | |
281 | while (1) { | |
282 | nr = pread(fd, buf, len, offset); | |
283 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
112db553 LT |
284 | continue; |
285 | return nr; | |
286 | } | |
287 | } | |
288 | ||
559e840b JH |
289 | ssize_t read_in_full(int fd, void *buf, size_t count) |
290 | { | |
291 | char *p = buf; | |
292 | ssize_t total = 0; | |
293 | ||
294 | while (count > 0) { | |
295 | ssize_t loaded = xread(fd, p, count); | |
56d7c27a JK |
296 | if (loaded < 0) |
297 | return -1; | |
298 | if (loaded == 0) | |
299 | return total; | |
559e840b JH |
300 | count -= loaded; |
301 | p += loaded; | |
302 | total += loaded; | |
303 | } | |
304 | ||
305 | return total; | |
306 | } | |
307 | ||
308 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
309 | { | |
310 | const char *p = buf; | |
311 | ssize_t total = 0; | |
312 | ||
313 | while (count > 0) { | |
314 | ssize_t written = xwrite(fd, p, count); | |
315 | if (written < 0) | |
316 | return -1; | |
317 | if (!written) { | |
318 | errno = ENOSPC; | |
319 | return -1; | |
320 | } | |
321 | count -= written; | |
322 | p += written; | |
323 | total += written; | |
324 | } | |
325 | ||
326 | return total; | |
327 | } | |
328 | ||
426ddeea YM |
329 | ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset) |
330 | { | |
331 | char *p = buf; | |
332 | ssize_t total = 0; | |
333 | ||
334 | while (count > 0) { | |
335 | ssize_t loaded = xpread(fd, p, count, offset); | |
336 | if (loaded < 0) | |
337 | return -1; | |
338 | if (loaded == 0) | |
339 | return total; | |
340 | count -= loaded; | |
341 | p += loaded; | |
342 | total += loaded; | |
343 | offset += loaded; | |
344 | } | |
345 | ||
346 | return total; | |
347 | } | |
348 | ||
112db553 LT |
349 | int xdup(int fd) |
350 | { | |
351 | int ret = dup(fd); | |
352 | if (ret < 0) | |
d824cbba | 353 | die_errno("dup failed"); |
112db553 LT |
354 | return ret; |
355 | } | |
356 | ||
260eec29 PT |
357 | /** |
358 | * xfopen() is the same as fopen(), but it die()s if the fopen() fails. | |
359 | */ | |
360 | FILE *xfopen(const char *path, const char *mode) | |
361 | { | |
362 | for (;;) { | |
363 | FILE *fp = fopen(path, mode); | |
364 | if (fp) | |
365 | return fp; | |
366 | if (errno == EINTR) | |
367 | continue; | |
368 | ||
369 | if (*mode && mode[1] == '+') | |
370 | die_errno(_("could not open '%s' for reading and writing"), path); | |
371 | else if (*mode == 'w' || *mode == 'a') | |
372 | die_errno(_("could not open '%s' for writing"), path); | |
373 | else | |
374 | die_errno(_("could not open '%s' for reading"), path); | |
375 | } | |
376 | } | |
377 | ||
112db553 LT |
378 | FILE *xfdopen(int fd, const char *mode) |
379 | { | |
380 | FILE *stream = fdopen(fd, mode); | |
afe8a907 | 381 | if (!stream) |
d824cbba | 382 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
383 | return stream; |
384 | } | |
385 | ||
79d7582e JS |
386 | FILE *fopen_for_writing(const char *path) |
387 | { | |
388 | FILE *ret = fopen(path, "w"); | |
389 | ||
390 | if (!ret && errno == EPERM) { | |
391 | if (!unlink(path)) | |
392 | ret = fopen(path, "w"); | |
393 | else | |
394 | errno = EPERM; | |
395 | } | |
396 | return ret; | |
397 | } | |
398 | ||
382fb07f NTND |
399 | static void warn_on_inaccessible(const char *path) |
400 | { | |
401 | warning_errno(_("unable to access '%s'"), path); | |
402 | } | |
403 | ||
11dc1fcb NTND |
404 | int warn_on_fopen_errors(const char *path) |
405 | { | |
406 | if (errno != ENOENT && errno != ENOTDIR) { | |
407 | warn_on_inaccessible(path); | |
408 | return -1; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
e9d983f1 NTND |
414 | FILE *fopen_or_warn(const char *path, const char *mode) |
415 | { | |
416 | FILE *fp = fopen(path, mode); | |
417 | ||
418 | if (fp) | |
419 | return fp; | |
420 | ||
421 | warn_on_fopen_errors(path); | |
422 | return NULL; | |
423 | } | |
424 | ||
eb78e23f | 425 | int xmkstemp(char *filename_template) |
112db553 LT |
426 | { |
427 | int fd; | |
6cf6bb3e | 428 | char origtemplate[PATH_MAX]; |
eb78e23f | 429 | strlcpy(origtemplate, filename_template, sizeof(origtemplate)); |
112db553 | 430 | |
eb78e23f | 431 | fd = mkstemp(filename_template); |
6cf6bb3e AE |
432 | if (fd < 0) { |
433 | int saved_errno = errno; | |
434 | const char *nonrelative_template; | |
435 | ||
eb78e23f BW |
436 | if (strlen(filename_template) != strlen(origtemplate)) |
437 | filename_template = origtemplate; | |
6cf6bb3e | 438 | |
eb78e23f | 439 | nonrelative_template = absolute_path(filename_template); |
6cf6bb3e AE |
440 | errno = saved_errno; |
441 | die_errno("Unable to create temporary file '%s'", | |
442 | nonrelative_template); | |
443 | } | |
112db553 LT |
444 | return fd; |
445 | } | |
39c68542 | 446 | |
33f23936 JN |
447 | /* Adapted from libiberty's mkstemp.c. */ |
448 | ||
449 | #undef TMP_MAX | |
450 | #define TMP_MAX 16384 | |
451 | ||
452 | int git_mkstemps_mode(char *pattern, int suffix_len, int mode) | |
453 | { | |
454 | static const char letters[] = | |
455 | "abcdefghijklmnopqrstuvwxyz" | |
456 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
457 | "0123456789"; | |
53d687bf JK |
458 | static const int num_letters = ARRAY_SIZE(letters) - 1; |
459 | static const char x_pattern[] = "XXXXXX"; | |
460 | static const int num_x = ARRAY_SIZE(x_pattern) - 1; | |
eb78e23f | 461 | char *filename_template; |
33f23936 JN |
462 | size_t len; |
463 | int fd, count; | |
464 | ||
465 | len = strlen(pattern); | |
466 | ||
53d687bf | 467 | if (len < num_x + suffix_len) { |
33f23936 JN |
468 | errno = EINVAL; |
469 | return -1; | |
470 | } | |
471 | ||
53d687bf | 472 | if (strncmp(&pattern[len - num_x - suffix_len], x_pattern, num_x)) { |
33f23936 JN |
473 | errno = EINVAL; |
474 | return -1; | |
475 | } | |
476 | ||
477 | /* | |
478 | * Replace pattern's XXXXXX characters with randomness. | |
479 | * Try TMP_MAX different filenames. | |
480 | */ | |
53d687bf | 481 | filename_template = &pattern[len - num_x - suffix_len]; |
33f23936 | 482 | for (count = 0; count < TMP_MAX; ++count) { |
54a80a9a | 483 | int i; |
47efda96 | 484 | uint64_t v; |
485 | if (csprng_bytes(&v, sizeof(v)) < 0) | |
486 | return error_errno("unable to get random bytes for temporary file"); | |
487 | ||
33f23936 | 488 | /* Fill in the random bits. */ |
53d687bf | 489 | for (i = 0; i < num_x; i++) { |
54a80a9a AH |
490 | filename_template[i] = letters[v % num_letters]; |
491 | v /= num_letters; | |
492 | } | |
33f23936 JN |
493 | |
494 | fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode); | |
a2cb86c1 | 495 | if (fd >= 0) |
33f23936 JN |
496 | return fd; |
497 | /* | |
498 | * Fatal error (EPERM, ENOSPC etc). | |
499 | * It doesn't make sense to loop. | |
500 | */ | |
501 | if (errno != EEXIST) | |
502 | break; | |
33f23936 JN |
503 | } |
504 | /* We return the null string if we can't find a unique file name. */ | |
505 | pattern[0] = '\0'; | |
506 | return -1; | |
507 | } | |
508 | ||
509 | int git_mkstemp_mode(char *pattern, int mode) | |
510 | { | |
511 | /* mkstemp is just mkstemps with no suffix */ | |
512 | return git_mkstemps_mode(pattern, 0, mode); | |
513 | } | |
514 | ||
eb78e23f | 515 | int xmkstemp_mode(char *filename_template, int mode) |
b862b61c MM |
516 | { |
517 | int fd; | |
6cf6bb3e | 518 | char origtemplate[PATH_MAX]; |
eb78e23f | 519 | strlcpy(origtemplate, filename_template, sizeof(origtemplate)); |
b862b61c | 520 | |
eb78e23f | 521 | fd = git_mkstemp_mode(filename_template, mode); |
6cf6bb3e AE |
522 | if (fd < 0) { |
523 | int saved_errno = errno; | |
524 | const char *nonrelative_template; | |
525 | ||
eb78e23f BW |
526 | if (!filename_template[0]) |
527 | filename_template = origtemplate; | |
6cf6bb3e | 528 | |
eb78e23f | 529 | nonrelative_template = absolute_path(filename_template); |
6cf6bb3e AE |
530 | errno = saved_errno; |
531 | die_errno("Unable to create temporary file '%s'", | |
532 | nonrelative_template); | |
533 | } | |
b862b61c MM |
534 | return fd; |
535 | } | |
536 | ||
abf38abe NS |
537 | /* |
538 | * Some platforms return EINTR from fsync. Since fsync is invoked in some | |
539 | * cases by a wrapper that dies on failure, do not expose EINTR to callers. | |
540 | */ | |
541 | static int fsync_loop(int fd) | |
542 | { | |
543 | int err; | |
544 | ||
545 | do { | |
546 | err = fsync(fd); | |
547 | } while (err < 0 && errno == EINTR); | |
548 | return err; | |
549 | } | |
550 | ||
551 | int git_fsync(int fd, enum fsync_action action) | |
552 | { | |
553 | switch (action) { | |
554 | case FSYNC_WRITEOUT_ONLY: | |
9a498767 | 555 | count_fsync_writeout_only += 1; |
abf38abe NS |
556 | |
557 | #ifdef __APPLE__ | |
558 | /* | |
559 | * On macOS, fsync just causes filesystem cache writeback but | |
560 | * does not flush hardware caches. | |
561 | */ | |
562 | return fsync_loop(fd); | |
563 | #endif | |
564 | ||
565 | #ifdef HAVE_SYNC_FILE_RANGE | |
566 | /* | |
567 | * On linux 2.6.17 and above, sync_file_range is the way to | |
568 | * issue a writeback without a hardware flush. An offset of | |
569 | * 0 and size of 0 indicates writeout of the entire file and the | |
570 | * wait flags ensure that all dirty data is written to the disk | |
571 | * (potentially in a disk-side cache) before we continue. | |
572 | */ | |
573 | ||
574 | return sync_file_range(fd, 0, 0, SYNC_FILE_RANGE_WAIT_BEFORE | | |
575 | SYNC_FILE_RANGE_WRITE | | |
576 | SYNC_FILE_RANGE_WAIT_AFTER); | |
577 | #endif | |
578 | ||
579 | #ifdef fsync_no_flush | |
580 | return fsync_no_flush(fd); | |
581 | #endif | |
582 | ||
583 | errno = ENOSYS; | |
584 | return -1; | |
585 | ||
586 | case FSYNC_HARDWARE_FLUSH: | |
9a498767 NS |
587 | count_fsync_hardware_flush += 1; |
588 | ||
abf38abe NS |
589 | /* |
590 | * On macOS, a special fcntl is required to really flush the | |
591 | * caches within the storage controller. As of this writing, | |
592 | * this is a very expensive operation on Apple SSDs. | |
593 | */ | |
594 | #ifdef __APPLE__ | |
595 | return fcntl(fd, F_FULLFSYNC); | |
596 | #else | |
597 | return fsync_loop(fd); | |
598 | #endif | |
599 | default: | |
600 | BUG("unexpected git_fsync(%d) call", action); | |
601 | } | |
602 | } | |
603 | ||
3a251bac ÆAB |
604 | static void log_trace_fsync_if(const char *key, intmax_t value) |
605 | { | |
606 | if (value) | |
607 | trace2_data_intmax("fsync", the_repository, key, value); | |
608 | } | |
609 | ||
9a498767 NS |
610 | void trace_git_fsync_stats(void) |
611 | { | |
3a251bac ÆAB |
612 | log_trace_fsync_if("fsync/writeout-only", count_fsync_writeout_only); |
613 | log_trace_fsync_if("fsync/hardware-flush", count_fsync_hardware_flush); | |
9a498767 NS |
614 | } |
615 | ||
10e13ec8 | 616 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 617 | { |
1054af7d RS |
618 | int err; |
619 | if (!rc || errno == ENOENT) | |
620 | return 0; | |
621 | err = errno; | |
0a288d1e | 622 | warning_errno("unable to %s '%s'", op, file); |
1054af7d | 623 | errno = err; |
fc71db39 AR |
624 | return rc; |
625 | } | |
626 | ||
9ccc0c08 RS |
627 | int unlink_or_msg(const char *file, struct strbuf *err) |
628 | { | |
629 | int rc = unlink(file); | |
630 | ||
631 | assert(err); | |
632 | ||
633 | if (!rc || errno == ENOENT) | |
634 | return 0; | |
635 | ||
0a288d1e | 636 | strbuf_addf(err, "unable to unlink '%s': %s", |
9ccc0c08 RS |
637 | file, strerror(errno)); |
638 | return -1; | |
639 | } | |
640 | ||
10e13ec8 PC |
641 | int unlink_or_warn(const char *file) |
642 | { | |
643 | return warn_if_unremovable("unlink", file, unlink(file)); | |
644 | } | |
d1723296 PC |
645 | |
646 | int rmdir_or_warn(const char *file) | |
647 | { | |
648 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
649 | } | |
80d706af PC |
650 | |
651 | int remove_or_warn(unsigned int mode, const char *file) | |
652 | { | |
653 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
654 | } | |
2f705875 | 655 | |
4698c8fe JN |
656 | static int access_error_is_ok(int err, unsigned flag) |
657 | { | |
c7054209 JH |
658 | return (is_missing_file_error(err) || |
659 | ((flag & ACCESS_EACCES_OK) && err == EACCES)); | |
4698c8fe JN |
660 | } |
661 | ||
662 | int access_or_warn(const char *path, int mode, unsigned flag) | |
ba8bd830 JK |
663 | { |
664 | int ret = access(path, mode); | |
4698c8fe | 665 | if (ret && !access_error_is_ok(errno, flag)) |
55b38a48 | 666 | warn_on_inaccessible(path); |
ba8bd830 JK |
667 | return ret; |
668 | } | |
669 | ||
4698c8fe | 670 | int access_or_die(const char *path, int mode, unsigned flag) |
96b9e0e3 JN |
671 | { |
672 | int ret = access(path, mode); | |
4698c8fe | 673 | if (ret && !access_error_is_ok(errno, flag)) |
96b9e0e3 JN |
674 | die_errno(_("unable to access '%s'"), path); |
675 | return ret; | |
676 | } | |
677 | ||
aa14e980 RS |
678 | char *xgetcwd(void) |
679 | { | |
680 | struct strbuf sb = STRBUF_INIT; | |
681 | if (strbuf_getcwd(&sb)) | |
682 | die_errno(_("unable to get current working directory")); | |
683 | return strbuf_detach(&sb, NULL); | |
684 | } | |
316e53e6 | 685 | |
7b03c89e JK |
686 | int xsnprintf(char *dst, size_t max, const char *fmt, ...) |
687 | { | |
688 | va_list ap; | |
689 | int len; | |
690 | ||
691 | va_start(ap, fmt); | |
692 | len = vsnprintf(dst, max, fmt, ap); | |
693 | va_end(ap); | |
694 | ||
695 | if (len < 0) | |
033abf97 | 696 | BUG("your snprintf is broken"); |
7b03c89e | 697 | if (len >= max) |
033abf97 | 698 | BUG("attempt to snprintf into too-small buffer"); |
7b03c89e JK |
699 | return len; |
700 | } | |
701 | ||
52563d7e | 702 | void write_file_buf(const char *path, const char *buf, size_t len) |
316e53e6 | 703 | { |
52563d7e | 704 | int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
06f46f23 | 705 | if (write_in_full(fd, buf, len) < 0) |
0a288d1e | 706 | die_errno(_("could not write to '%s'"), path); |
52563d7e | 707 | if (close(fd)) |
0a288d1e | 708 | die_errno(_("could not close '%s'"), path); |
316e53e6 | 709 | } |
2024d317 | 710 | |
ef22318c | 711 | void write_file(const char *path, const char *fmt, ...) |
12d6ce1d | 712 | { |
12d6ce1d | 713 | va_list params; |
316e53e6 | 714 | struct strbuf sb = STRBUF_INIT; |
12d6ce1d JH |
715 | |
716 | va_start(params, fmt); | |
ef22318c | 717 | strbuf_vaddf(&sb, fmt, params); |
12d6ce1d | 718 | va_end(params); |
12d6ce1d | 719 | |
ef22318c | 720 | strbuf_complete_line(&sb); |
12d6ce1d | 721 | |
52563d7e | 722 | write_file_buf(path, sb.buf, sb.len); |
ef22318c | 723 | strbuf_release(&sb); |
12d6ce1d JH |
724 | } |
725 | ||
2024d317 JS |
726 | void sleep_millisec(int millisec) |
727 | { | |
728 | poll(NULL, 0, millisec); | |
729 | } | |
5781a9a2 DT |
730 | |
731 | int xgethostname(char *buf, size_t len) | |
732 | { | |
733 | /* | |
734 | * If the full hostname doesn't fit in buf, POSIX does not | |
735 | * specify whether the buffer will be null-terminated, so to | |
736 | * be safe, do it ourselves. | |
737 | */ | |
738 | int ret = gethostname(buf, len); | |
739 | if (!ret) | |
740 | buf[len - 1] = 0; | |
741 | return ret; | |
742 | } | |
e3b1e3bd PB |
743 | |
744 | int is_empty_or_missing_file(const char *filename) | |
745 | { | |
746 | struct stat st; | |
747 | ||
748 | if (stat(filename, &st) < 0) { | |
749 | if (errno == ENOENT) | |
750 | return 1; | |
751 | die_errno(_("could not stat %s"), filename); | |
752 | } | |
753 | ||
754 | return !st.st_size; | |
755 | } | |
00611d84 JK |
756 | |
757 | int open_nofollow(const char *path, int flags) | |
758 | { | |
759 | #ifdef O_NOFOLLOW | |
760 | return open(path, flags | O_NOFOLLOW); | |
761 | #else | |
762 | struct stat st; | |
763 | if (lstat(path, &st) < 0) | |
764 | return -1; | |
765 | if (S_ISLNK(st.st_mode)) { | |
766 | errno = ELOOP; | |
767 | return -1; | |
768 | } | |
769 | return open(path, flags); | |
770 | #endif | |
771 | } | |
05cd988d | 772 | |
773 | int csprng_bytes(void *buf, size_t len) | |
774 | { | |
775 | #if defined(HAVE_ARC4RANDOM) || defined(HAVE_ARC4RANDOM_LIBBSD) | |
776 | /* This function never returns an error. */ | |
777 | arc4random_buf(buf, len); | |
778 | return 0; | |
779 | #elif defined(HAVE_GETRANDOM) | |
780 | ssize_t res; | |
781 | char *p = buf; | |
782 | while (len) { | |
783 | res = getrandom(p, len, 0); | |
784 | if (res < 0) | |
785 | return -1; | |
786 | len -= res; | |
787 | p += res; | |
788 | } | |
789 | return 0; | |
790 | #elif defined(HAVE_GETENTROPY) | |
791 | int res; | |
792 | char *p = buf; | |
793 | while (len) { | |
794 | /* getentropy has a maximum size of 256 bytes. */ | |
795 | size_t chunk = len < 256 ? len : 256; | |
796 | res = getentropy(p, chunk); | |
797 | if (res < 0) | |
798 | return -1; | |
799 | len -= chunk; | |
800 | p += chunk; | |
801 | } | |
802 | return 0; | |
803 | #elif defined(HAVE_RTLGENRANDOM) | |
804 | if (!RtlGenRandom(buf, len)) | |
805 | return -1; | |
806 | return 0; | |
807 | #elif defined(HAVE_OPENSSL_CSPRNG) | |
808 | int res = RAND_bytes(buf, len); | |
809 | if (res == 1) | |
810 | return 0; | |
811 | if (res == -1) | |
812 | errno = ENOTSUP; | |
813 | else | |
814 | errno = EIO; | |
815 | return -1; | |
816 | #else | |
817 | ssize_t res; | |
818 | char *p = buf; | |
819 | int fd, err; | |
820 | fd = open("/dev/urandom", O_RDONLY); | |
821 | if (fd < 0) | |
822 | return -1; | |
823 | while (len) { | |
824 | res = xread(fd, p, len); | |
825 | if (res < 0) { | |
826 | err = errno; | |
827 | close(fd); | |
828 | errno = err; | |
829 | return -1; | |
830 | } | |
831 | len -= res; | |
832 | p += res; | |
833 | } | |
834 | close(fd); | |
835 | return 0; | |
836 | #endif | |
837 | } |