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