1 | /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. |
2 | * |
3 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
4 | * of this software and associated documentation files (the "Software"), to |
5 | * deal in the Software without restriction, including without limitation the |
6 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
7 | * sell copies of the Software, and to permit persons to whom the Software is |
8 | * furnished to do so, subject to the following conditions: |
9 | * |
10 | * The above copyright notice and this permission notice shall be included in |
11 | * all copies or substantial portions of the Software. |
12 | * |
13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
15 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
16 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
17 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
18 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
19 | * IN THE SOFTWARE. |
20 | */ |
21 | |
22 | /* Caveat emptor: this file deviates from the libuv convention of returning |
23 | * negated errno codes. Most uv_fs_*() functions map directly to the system |
24 | * call of the same name. For more complex wrappers, it's easier to just |
25 | * return -1 with errno set. The dispatcher in uv__fs_work() takes care of |
26 | * getting the errno to the right place (req->result or as the return value.) |
27 | */ |
28 | |
29 | #include "uv.h" |
30 | #include "internal.h" |
31 | |
32 | #include <errno.h> |
33 | #include <stdio.h> |
34 | #include <stdlib.h> |
35 | #include <string.h> |
36 | #include <limits.h> /* PATH_MAX */ |
37 | |
38 | #include <sys/types.h> |
39 | #include <sys/socket.h> |
40 | #include <sys/stat.h> |
41 | #include <sys/time.h> |
42 | #include <sys/uio.h> |
43 | #include <pthread.h> |
44 | #include <unistd.h> |
45 | #include <fcntl.h> |
46 | #include <poll.h> |
47 | |
48 | #if defined(__DragonFly__) || \ |
49 | defined(__FreeBSD__) || \ |
50 | defined(__FreeBSD_kernel__) || \ |
51 | defined(__OpenBSD__) || \ |
52 | defined(__NetBSD__) |
53 | # define HAVE_PREADV 1 |
54 | #else |
55 | # define HAVE_PREADV 0 |
56 | #endif |
57 | |
58 | #if defined(__linux__) || defined(__sun) |
59 | # include <sys/sendfile.h> |
60 | #endif |
61 | |
62 | #if defined(__APPLE__) |
63 | # include <sys/sysctl.h> |
64 | #elif defined(__linux__) && !defined(FICLONE) |
65 | # include <sys/ioctl.h> |
66 | # define FICLONE _IOW(0x94, 9, int) |
67 | #endif |
68 | |
69 | #if defined(_AIX) && !defined(_AIX71) |
70 | # include <utime.h> |
71 | #endif |
72 | |
73 | #if defined(__APPLE__) || \ |
74 | defined(__DragonFly__) || \ |
75 | defined(__FreeBSD__) || \ |
76 | defined(__FreeBSD_kernel__) || \ |
77 | defined(__OpenBSD__) || \ |
78 | defined(__NetBSD__) |
79 | # include <sys/param.h> |
80 | # include <sys/mount.h> |
81 | #elif defined(__sun) || defined(__MVS__) |
82 | # include <sys/statvfs.h> |
83 | #else |
84 | # include <sys/statfs.h> |
85 | #endif |
86 | |
87 | #if defined(_AIX) && _XOPEN_SOURCE <= 600 |
88 | extern char *mkdtemp(char *template); /* See issue #740 on AIX < 7 */ |
89 | #endif |
90 | |
91 | #define INIT(subtype) \ |
92 | do { \ |
93 | if (req == NULL) \ |
94 | return UV_EINVAL; \ |
95 | UV_REQ_INIT(req, UV_FS); \ |
96 | req->fs_type = UV_FS_ ## subtype; \ |
97 | req->result = 0; \ |
98 | req->ptr = NULL; \ |
99 | req->loop = loop; \ |
100 | req->path = NULL; \ |
101 | req->new_path = NULL; \ |
102 | req->bufs = NULL; \ |
103 | req->cb = cb; \ |
104 | } \ |
105 | while (0) |
106 | |
107 | #define PATH \ |
108 | do { \ |
109 | assert(path != NULL); \ |
110 | if (cb == NULL) { \ |
111 | req->path = path; \ |
112 | } else { \ |
113 | req->path = uv__strdup(path); \ |
114 | if (req->path == NULL) \ |
115 | return UV_ENOMEM; \ |
116 | } \ |
117 | } \ |
118 | while (0) |
119 | |
120 | #define PATH2 \ |
121 | do { \ |
122 | if (cb == NULL) { \ |
123 | req->path = path; \ |
124 | req->new_path = new_path; \ |
125 | } else { \ |
126 | size_t path_len; \ |
127 | size_t new_path_len; \ |
128 | path_len = strlen(path) + 1; \ |
129 | new_path_len = strlen(new_path) + 1; \ |
130 | req->path = uv__malloc(path_len + new_path_len); \ |
131 | if (req->path == NULL) \ |
132 | return UV_ENOMEM; \ |
133 | req->new_path = req->path + path_len; \ |
134 | memcpy((void*) req->path, path, path_len); \ |
135 | memcpy((void*) req->new_path, new_path, new_path_len); \ |
136 | } \ |
137 | } \ |
138 | while (0) |
139 | |
140 | #define POST \ |
141 | do { \ |
142 | if (cb != NULL) { \ |
143 | uv__req_register(loop, req); \ |
144 | uv__work_submit(loop, \ |
145 | &req->work_req, \ |
146 | UV__WORK_FAST_IO, \ |
147 | uv__fs_work, \ |
148 | uv__fs_done); \ |
149 | return 0; \ |
150 | } \ |
151 | else { \ |
152 | uv__fs_work(&req->work_req); \ |
153 | return req->result; \ |
154 | } \ |
155 | } \ |
156 | while (0) |
157 | |
158 | |
159 | static int uv__fs_close(int fd) { |
160 | int rc; |
161 | |
162 | rc = uv__close_nocancel(fd); |
163 | if (rc == -1) |
164 | if (errno == EINTR || errno == EINPROGRESS) |
165 | rc = 0; /* The close is in progress, not an error. */ |
166 | |
167 | return rc; |
168 | } |
169 | |
170 | |
171 | static ssize_t uv__fs_fsync(uv_fs_t* req) { |
172 | #if defined(__APPLE__) |
173 | /* Apple's fdatasync and fsync explicitly do NOT flush the drive write cache |
174 | * to the drive platters. This is in contrast to Linux's fdatasync and fsync |
175 | * which do, according to recent man pages. F_FULLFSYNC is Apple's equivalent |
176 | * for flushing buffered data to permanent storage. If F_FULLFSYNC is not |
177 | * supported by the file system we fall back to F_BARRIERFSYNC or fsync(). |
178 | * This is the same approach taken by sqlite, except sqlite does not issue |
179 | * an F_BARRIERFSYNC call. |
180 | */ |
181 | int r; |
182 | |
183 | r = fcntl(req->file, F_FULLFSYNC); |
184 | if (r != 0) |
185 | r = fcntl(req->file, 85 /* F_BARRIERFSYNC */); /* fsync + barrier */ |
186 | if (r != 0) |
187 | r = fsync(req->file); |
188 | return r; |
189 | #else |
190 | return fsync(req->file); |
191 | #endif |
192 | } |
193 | |
194 | |
195 | static ssize_t uv__fs_fdatasync(uv_fs_t* req) { |
196 | #if defined(__linux__) || defined(__sun) || defined(__NetBSD__) |
197 | return fdatasync(req->file); |
198 | #elif defined(__APPLE__) |
199 | /* See the comment in uv__fs_fsync. */ |
200 | return uv__fs_fsync(req); |
201 | #else |
202 | return fsync(req->file); |
203 | #endif |
204 | } |
205 | |
206 | |
207 | static ssize_t uv__fs_futime(uv_fs_t* req) { |
208 | #if defined(__linux__) \ |
209 | || defined(_AIX71) \ |
210 | || defined(__HAIKU__) |
211 | /* utimesat() has nanosecond resolution but we stick to microseconds |
212 | * for the sake of consistency with other platforms. |
213 | */ |
214 | struct timespec ts[2]; |
215 | ts[0].tv_sec = req->atime; |
216 | ts[0].tv_nsec = (uint64_t)(req->atime * 1000000) % 1000000 * 1000; |
217 | ts[1].tv_sec = req->mtime; |
218 | ts[1].tv_nsec = (uint64_t)(req->mtime * 1000000) % 1000000 * 1000; |
219 | return futimens(req->file, ts); |
220 | #elif defined(__APPLE__) \ |
221 | || defined(__DragonFly__) \ |
222 | || defined(__FreeBSD__) \ |
223 | || defined(__FreeBSD_kernel__) \ |
224 | || defined(__NetBSD__) \ |
225 | || defined(__OpenBSD__) \ |
226 | || defined(__sun) |
227 | struct timeval tv[2]; |
228 | tv[0].tv_sec = req->atime; |
229 | tv[0].tv_usec = (uint64_t)(req->atime * 1000000) % 1000000; |
230 | tv[1].tv_sec = req->mtime; |
231 | tv[1].tv_usec = (uint64_t)(req->mtime * 1000000) % 1000000; |
232 | # if defined(__sun) |
233 | return futimesat(req->file, NULL, tv); |
234 | # else |
235 | return futimes(req->file, tv); |
236 | # endif |
237 | #elif defined(__MVS__) |
238 | attrib_t atr; |
239 | memset(&atr, 0, sizeof(atr)); |
240 | atr.att_mtimechg = 1; |
241 | atr.att_atimechg = 1; |
242 | atr.att_mtime = req->mtime; |
243 | atr.att_atime = req->atime; |
244 | return __fchattr(req->file, &atr, sizeof(atr)); |
245 | #else |
246 | errno = ENOSYS; |
247 | return -1; |
248 | #endif |
249 | } |
250 | |
251 | |
252 | static ssize_t uv__fs_mkdtemp(uv_fs_t* req) { |
253 | return mkdtemp((char*) req->path) ? 0 : -1; |
254 | } |
255 | |
256 | |
257 | static ssize_t uv__fs_open(uv_fs_t* req) { |
258 | static int no_cloexec_support; |
259 | int r; |
260 | |
261 | /* Try O_CLOEXEC before entering locks */ |
262 | if (no_cloexec_support == 0) { |
263 | #ifdef O_CLOEXEC |
264 | r = open(req->path, req->flags | O_CLOEXEC, req->mode); |
265 | if (r >= 0) |
266 | return r; |
267 | if (errno != EINVAL) |
268 | return r; |
269 | no_cloexec_support = 1; |
270 | #endif /* O_CLOEXEC */ |
271 | } |
272 | |
273 | if (req->cb != NULL) |
274 | uv_rwlock_rdlock(&req->loop->cloexec_lock); |
275 | |
276 | r = open(req->path, req->flags, req->mode); |
277 | |
278 | /* In case of failure `uv__cloexec` will leave error in `errno`, |
279 | * so it is enough to just set `r` to `-1`. |
280 | */ |
281 | if (r >= 0 && uv__cloexec(r, 1) != 0) { |
282 | r = uv__close(r); |
283 | if (r != 0) |
284 | abort(); |
285 | r = -1; |
286 | } |
287 | |
288 | if (req->cb != NULL) |
289 | uv_rwlock_rdunlock(&req->loop->cloexec_lock); |
290 | |
291 | return r; |
292 | } |
293 | |
294 | |
295 | #if !HAVE_PREADV |
296 | static ssize_t uv__fs_preadv(uv_file fd, |
297 | uv_buf_t* bufs, |
298 | unsigned int nbufs, |
299 | off_t off) { |
300 | uv_buf_t* buf; |
301 | uv_buf_t* end; |
302 | ssize_t result; |
303 | ssize_t rc; |
304 | size_t pos; |
305 | |
306 | assert(nbufs > 0); |
307 | |
308 | result = 0; |
309 | pos = 0; |
310 | buf = bufs + 0; |
311 | end = bufs + nbufs; |
312 | |
313 | for (;;) { |
314 | do |
315 | rc = pread(fd, buf->base + pos, buf->len - pos, off + result); |
316 | while (rc == -1 && errno == EINTR); |
317 | |
318 | if (rc == 0) |
319 | break; |
320 | |
321 | if (rc == -1 && result == 0) |
322 | return UV__ERR(errno); |
323 | |
324 | if (rc == -1) |
325 | break; /* We read some data so return that, ignore the error. */ |
326 | |
327 | pos += rc; |
328 | result += rc; |
329 | |
330 | if (pos < buf->len) |
331 | continue; |
332 | |
333 | pos = 0; |
334 | buf += 1; |
335 | |
336 | if (buf == end) |
337 | break; |
338 | } |
339 | |
340 | return result; |
341 | } |
342 | #endif |
343 | |
344 | |
345 | static ssize_t uv__fs_read(uv_fs_t* req) { |
346 | #if defined(__linux__) |
347 | static int no_preadv; |
348 | #endif |
349 | unsigned int iovmax; |
350 | ssize_t result; |
351 | |
352 | iovmax = uv__getiovmax(); |
353 | if (req->nbufs > iovmax) |
354 | req->nbufs = iovmax; |
355 | |
356 | if (req->off < 0) { |
357 | if (req->nbufs == 1) |
358 | result = read(req->file, req->bufs[0].base, req->bufs[0].len); |
359 | else |
360 | result = readv(req->file, (struct iovec*) req->bufs, req->nbufs); |
361 | } else { |
362 | if (req->nbufs == 1) { |
363 | result = pread(req->file, req->bufs[0].base, req->bufs[0].len, req->off); |
364 | goto done; |
365 | } |
366 | |
367 | #if HAVE_PREADV |
368 | result = preadv(req->file, (struct iovec*) req->bufs, req->nbufs, req->off); |
369 | #else |
370 | # if defined(__linux__) |
371 | if (no_preadv) retry: |
372 | # endif |
373 | { |
374 | result = uv__fs_preadv(req->file, req->bufs, req->nbufs, req->off); |
375 | } |
376 | # if defined(__linux__) |
377 | else { |
378 | result = uv__preadv(req->file, |
379 | (struct iovec*)req->bufs, |
380 | req->nbufs, |
381 | req->off); |
382 | if (result == -1 && errno == ENOSYS) { |
383 | no_preadv = 1; |
384 | goto retry; |
385 | } |
386 | } |
387 | # endif |
388 | #endif |
389 | } |
390 | |
391 | done: |
392 | /* Early cleanup of bufs allocation, since we're done with it. */ |
393 | if (req->bufs != req->bufsml) |
394 | uv__free(req->bufs); |
395 | |
396 | req->bufs = NULL; |
397 | req->nbufs = 0; |
398 | |
399 | #ifdef __PASE__ |
400 | /* PASE returns EOPNOTSUPP when reading a directory, convert to EISDIR */ |
401 | if (result == -1 && errno == EOPNOTSUPP) { |
402 | struct stat buf; |
403 | ssize_t rc; |
404 | rc = fstat(req->file, &buf); |
405 | if (rc == 0 && S_ISDIR(buf.st_mode)) { |
406 | errno = EISDIR; |
407 | } |
408 | } |
409 | #endif |
410 | |
411 | return result; |
412 | } |
413 | |
414 | |
415 | #if defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_8) |
416 | #define UV_CONST_DIRENT uv__dirent_t |
417 | #else |
418 | #define UV_CONST_DIRENT const uv__dirent_t |
419 | #endif |
420 | |
421 | |
422 | static int uv__fs_scandir_filter(UV_CONST_DIRENT* dent) { |
423 | return strcmp(dent->d_name, "." ) != 0 && strcmp(dent->d_name, ".." ) != 0; |
424 | } |
425 | |
426 | |
427 | static int uv__fs_scandir_sort(UV_CONST_DIRENT** a, UV_CONST_DIRENT** b) { |
428 | return strcmp((*a)->d_name, (*b)->d_name); |
429 | } |
430 | |
431 | |
432 | static ssize_t uv__fs_scandir(uv_fs_t* req) { |
433 | uv__dirent_t** dents; |
434 | int n; |
435 | |
436 | dents = NULL; |
437 | n = scandir(req->path, &dents, uv__fs_scandir_filter, uv__fs_scandir_sort); |
438 | |
439 | /* NOTE: We will use nbufs as an index field */ |
440 | req->nbufs = 0; |
441 | |
442 | if (n == 0) { |
443 | /* OS X still needs to deallocate some memory. |
444 | * Memory was allocated using the system allocator, so use free() here. |
445 | */ |
446 | free(dents); |
447 | dents = NULL; |
448 | } else if (n == -1) { |
449 | return n; |
450 | } |
451 | |
452 | req->ptr = dents; |
453 | |
454 | return n; |
455 | } |
456 | |
457 | static int uv__fs_opendir(uv_fs_t* req) { |
458 | uv_dir_t* dir; |
459 | |
460 | dir = uv__malloc(sizeof(*dir)); |
461 | if (dir == NULL) |
462 | goto error; |
463 | |
464 | dir->dir = opendir(req->path); |
465 | if (dir->dir == NULL) |
466 | goto error; |
467 | |
468 | req->ptr = dir; |
469 | return 0; |
470 | |
471 | error: |
472 | uv__free(dir); |
473 | req->ptr = NULL; |
474 | return -1; |
475 | } |
476 | |
477 | static int uv__fs_readdir(uv_fs_t* req) { |
478 | uv_dir_t* dir; |
479 | uv_dirent_t* dirent; |
480 | struct dirent* res; |
481 | unsigned int dirent_idx; |
482 | unsigned int i; |
483 | |
484 | dir = req->ptr; |
485 | dirent_idx = 0; |
486 | |
487 | while (dirent_idx < dir->nentries) { |
488 | /* readdir() returns NULL on end of directory, as well as on error. errno |
489 | is used to differentiate between the two conditions. */ |
490 | errno = 0; |
491 | res = readdir(dir->dir); |
492 | |
493 | if (res == NULL) { |
494 | if (errno != 0) |
495 | goto error; |
496 | break; |
497 | } |
498 | |
499 | if (strcmp(res->d_name, "." ) == 0 || strcmp(res->d_name, ".." ) == 0) |
500 | continue; |
501 | |
502 | dirent = &dir->dirents[dirent_idx]; |
503 | dirent->name = uv__strdup(res->d_name); |
504 | |
505 | if (dirent->name == NULL) |
506 | goto error; |
507 | |
508 | dirent->type = uv__fs_get_dirent_type(res); |
509 | ++dirent_idx; |
510 | } |
511 | |
512 | return dirent_idx; |
513 | |
514 | error: |
515 | for (i = 0; i < dirent_idx; ++i) { |
516 | uv__free((char*) dir->dirents[i].name); |
517 | dir->dirents[i].name = NULL; |
518 | } |
519 | |
520 | return -1; |
521 | } |
522 | |
523 | static int uv__fs_closedir(uv_fs_t* req) { |
524 | uv_dir_t* dir; |
525 | |
526 | dir = req->ptr; |
527 | |
528 | if (dir->dir != NULL) { |
529 | closedir(dir->dir); |
530 | dir->dir = NULL; |
531 | } |
532 | |
533 | uv__free(req->ptr); |
534 | req->ptr = NULL; |
535 | return 0; |
536 | } |
537 | |
538 | static int uv__fs_statfs(uv_fs_t* req) { |
539 | uv_statfs_t* stat_fs; |
540 | #if defined(__sun) || defined(__MVS__) |
541 | struct statvfs buf; |
542 | |
543 | if (0 != statvfs(req->path, &buf)) |
544 | #else |
545 | struct statfs buf; |
546 | |
547 | if (0 != statfs(req->path, &buf)) |
548 | #endif /* defined(__sun) */ |
549 | return -1; |
550 | |
551 | stat_fs = uv__malloc(sizeof(*stat_fs)); |
552 | if (stat_fs == NULL) { |
553 | errno = ENOMEM; |
554 | return -1; |
555 | } |
556 | |
557 | #if defined(__sun) || defined(__MVS__) |
558 | stat_fs->f_type = 0; /* f_type is not supported. */ |
559 | #else |
560 | stat_fs->f_type = buf.f_type; |
561 | #endif |
562 | stat_fs->f_bsize = buf.f_bsize; |
563 | stat_fs->f_blocks = buf.f_blocks; |
564 | stat_fs->f_bfree = buf.f_bfree; |
565 | stat_fs->f_bavail = buf.f_bavail; |
566 | stat_fs->f_files = buf.f_files; |
567 | stat_fs->f_ffree = buf.f_ffree; |
568 | req->ptr = stat_fs; |
569 | return 0; |
570 | } |
571 | |
572 | static ssize_t uv__fs_pathmax_size(const char* path) { |
573 | ssize_t pathmax; |
574 | |
575 | pathmax = pathconf(path, _PC_PATH_MAX); |
576 | |
577 | if (pathmax == -1) |
578 | pathmax = UV__PATH_MAX; |
579 | |
580 | return pathmax; |
581 | } |
582 | |
583 | static ssize_t uv__fs_readlink(uv_fs_t* req) { |
584 | ssize_t maxlen; |
585 | ssize_t len; |
586 | char* buf; |
587 | char* newbuf; |
588 | |
589 | #if defined(_POSIX_PATH_MAX) || defined(PATH_MAX) |
590 | maxlen = uv__fs_pathmax_size(req->path); |
591 | #else |
592 | /* We may not have a real PATH_MAX. Read size of link. */ |
593 | struct stat st; |
594 | int ret; |
595 | ret = lstat(req->path, &st); |
596 | if (ret != 0) |
597 | return -1; |
598 | if (!S_ISLNK(st.st_mode)) { |
599 | errno = EINVAL; |
600 | return -1; |
601 | } |
602 | |
603 | maxlen = st.st_size; |
604 | |
605 | /* According to readlink(2) lstat can report st_size == 0 |
606 | for some symlinks, such as those in /proc or /sys. */ |
607 | if (maxlen == 0) |
608 | maxlen = uv__fs_pathmax_size(req->path); |
609 | #endif |
610 | |
611 | buf = uv__malloc(maxlen); |
612 | |
613 | if (buf == NULL) { |
614 | errno = ENOMEM; |
615 | return -1; |
616 | } |
617 | |
618 | #if defined(__MVS__) |
619 | len = os390_readlink(req->path, buf, maxlen); |
620 | #else |
621 | len = readlink(req->path, buf, maxlen); |
622 | #endif |
623 | |
624 | if (len == -1) { |
625 | uv__free(buf); |
626 | return -1; |
627 | } |
628 | |
629 | /* Uncommon case: resize to make room for the trailing nul byte. */ |
630 | if (len == maxlen) { |
631 | newbuf = uv__realloc(buf, len + 1); |
632 | |
633 | if (newbuf == NULL) { |
634 | uv__free(buf); |
635 | return -1; |
636 | } |
637 | |
638 | buf = newbuf; |
639 | } |
640 | |
641 | buf[len] = '\0'; |
642 | req->ptr = buf; |
643 | |
644 | return 0; |
645 | } |
646 | |
647 | static ssize_t uv__fs_realpath(uv_fs_t* req) { |
648 | char* buf; |
649 | |
650 | #if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L |
651 | buf = realpath(req->path, NULL); |
652 | if (buf == NULL) |
653 | return -1; |
654 | #else |
655 | ssize_t len; |
656 | |
657 | len = uv__fs_pathmax_size(req->path); |
658 | buf = uv__malloc(len + 1); |
659 | |
660 | if (buf == NULL) { |
661 | errno = ENOMEM; |
662 | return -1; |
663 | } |
664 | |
665 | if (realpath(req->path, buf) == NULL) { |
666 | uv__free(buf); |
667 | return -1; |
668 | } |
669 | #endif |
670 | |
671 | req->ptr = buf; |
672 | |
673 | return 0; |
674 | } |
675 | |
676 | static ssize_t uv__fs_sendfile_emul(uv_fs_t* req) { |
677 | struct pollfd pfd; |
678 | int use_pread; |
679 | off_t offset; |
680 | ssize_t nsent; |
681 | ssize_t nread; |
682 | ssize_t nwritten; |
683 | size_t buflen; |
684 | size_t len; |
685 | ssize_t n; |
686 | int in_fd; |
687 | int out_fd; |
688 | char buf[8192]; |
689 | |
690 | len = req->bufsml[0].len; |
691 | in_fd = req->flags; |
692 | out_fd = req->file; |
693 | offset = req->off; |
694 | use_pread = 1; |
695 | |
696 | /* Here are the rules regarding errors: |
697 | * |
698 | * 1. Read errors are reported only if nsent==0, otherwise we return nsent. |
699 | * The user needs to know that some data has already been sent, to stop |
700 | * them from sending it twice. |
701 | * |
702 | * 2. Write errors are always reported. Write errors are bad because they |
703 | * mean data loss: we've read data but now we can't write it out. |
704 | * |
705 | * We try to use pread() and fall back to regular read() if the source fd |
706 | * doesn't support positional reads, for example when it's a pipe fd. |
707 | * |
708 | * If we get EAGAIN when writing to the target fd, we poll() on it until |
709 | * it becomes writable again. |
710 | * |
711 | * FIXME: If we get a write error when use_pread==1, it should be safe to |
712 | * return the number of sent bytes instead of an error because pread() |
713 | * is, in theory, idempotent. However, special files in /dev or /proc |
714 | * may support pread() but not necessarily return the same data on |
715 | * successive reads. |
716 | * |
717 | * FIXME: There is no way now to signal that we managed to send *some* data |
718 | * before a write error. |
719 | */ |
720 | for (nsent = 0; (size_t) nsent < len; ) { |
721 | buflen = len - nsent; |
722 | |
723 | if (buflen > sizeof(buf)) |
724 | buflen = sizeof(buf); |
725 | |
726 | do |
727 | if (use_pread) |
728 | nread = pread(in_fd, buf, buflen, offset); |
729 | else |
730 | nread = read(in_fd, buf, buflen); |
731 | while (nread == -1 && errno == EINTR); |
732 | |
733 | if (nread == 0) |
734 | goto out; |
735 | |
736 | if (nread == -1) { |
737 | if (use_pread && nsent == 0 && (errno == EIO || errno == ESPIPE)) { |
738 | use_pread = 0; |
739 | continue; |
740 | } |
741 | |
742 | if (nsent == 0) |
743 | nsent = -1; |
744 | |
745 | goto out; |
746 | } |
747 | |
748 | for (nwritten = 0; nwritten < nread; ) { |
749 | do |
750 | n = write(out_fd, buf + nwritten, nread - nwritten); |
751 | while (n == -1 && errno == EINTR); |
752 | |
753 | if (n != -1) { |
754 | nwritten += n; |
755 | continue; |
756 | } |
757 | |
758 | if (errno != EAGAIN && errno != EWOULDBLOCK) { |
759 | nsent = -1; |
760 | goto out; |
761 | } |
762 | |
763 | pfd.fd = out_fd; |
764 | pfd.events = POLLOUT; |
765 | pfd.revents = 0; |
766 | |
767 | do |
768 | n = poll(&pfd, 1, -1); |
769 | while (n == -1 && errno == EINTR); |
770 | |
771 | if (n == -1 || (pfd.revents & ~POLLOUT) != 0) { |
772 | errno = EIO; |
773 | nsent = -1; |
774 | goto out; |
775 | } |
776 | } |
777 | |
778 | offset += nread; |
779 | nsent += nread; |
780 | } |
781 | |
782 | out: |
783 | if (nsent != -1) |
784 | req->off = offset; |
785 | |
786 | return nsent; |
787 | } |
788 | |
789 | |
790 | static ssize_t uv__fs_sendfile(uv_fs_t* req) { |
791 | int in_fd; |
792 | int out_fd; |
793 | |
794 | in_fd = req->flags; |
795 | out_fd = req->file; |
796 | |
797 | #if defined(__linux__) || defined(__sun) |
798 | { |
799 | off_t off; |
800 | ssize_t r; |
801 | |
802 | off = req->off; |
803 | r = sendfile(out_fd, in_fd, &off, req->bufsml[0].len); |
804 | |
805 | /* sendfile() on SunOS returns EINVAL if the target fd is not a socket but |
806 | * it still writes out data. Fortunately, we can detect it by checking if |
807 | * the offset has been updated. |
808 | */ |
809 | if (r != -1 || off > req->off) { |
810 | r = off - req->off; |
811 | req->off = off; |
812 | return r; |
813 | } |
814 | |
815 | if (errno == EINVAL || |
816 | errno == EIO || |
817 | errno == ENOTSOCK || |
818 | errno == EXDEV) { |
819 | errno = 0; |
820 | return uv__fs_sendfile_emul(req); |
821 | } |
822 | |
823 | return -1; |
824 | } |
825 | #elif defined(__APPLE__) || \ |
826 | defined(__DragonFly__) || \ |
827 | defined(__FreeBSD__) || \ |
828 | defined(__FreeBSD_kernel__) |
829 | { |
830 | off_t len; |
831 | ssize_t r; |
832 | |
833 | /* sendfile() on FreeBSD and Darwin returns EAGAIN if the target fd is in |
834 | * non-blocking mode and not all data could be written. If a non-zero |
835 | * number of bytes have been sent, we don't consider it an error. |
836 | */ |
837 | |
838 | #if defined(__FreeBSD__) || defined(__DragonFly__) |
839 | len = 0; |
840 | r = sendfile(in_fd, out_fd, req->off, req->bufsml[0].len, NULL, &len, 0); |
841 | #elif defined(__FreeBSD_kernel__) |
842 | len = 0; |
843 | r = bsd_sendfile(in_fd, |
844 | out_fd, |
845 | req->off, |
846 | req->bufsml[0].len, |
847 | NULL, |
848 | &len, |
849 | 0); |
850 | #else |
851 | /* The darwin sendfile takes len as an input for the length to send, |
852 | * so make sure to initialize it with the caller's value. */ |
853 | len = req->bufsml[0].len; |
854 | r = sendfile(in_fd, out_fd, req->off, &len, NULL, 0); |
855 | #endif |
856 | |
857 | /* |
858 | * The man page for sendfile(2) on DragonFly states that `len` contains |
859 | * a meaningful value ONLY in case of EAGAIN and EINTR. |
860 | * Nothing is said about it's value in case of other errors, so better |
861 | * not depend on the potential wrong assumption that is was not modified |
862 | * by the syscall. |
863 | */ |
864 | if (r == 0 || ((errno == EAGAIN || errno == EINTR) && len != 0)) { |
865 | req->off += len; |
866 | return (ssize_t) len; |
867 | } |
868 | |
869 | if (errno == EINVAL || |
870 | errno == EIO || |
871 | errno == ENOTSOCK || |
872 | errno == EXDEV) { |
873 | errno = 0; |
874 | return uv__fs_sendfile_emul(req); |
875 | } |
876 | |
877 | return -1; |
878 | } |
879 | #else |
880 | /* Squelch compiler warnings. */ |
881 | (void) &in_fd; |
882 | (void) &out_fd; |
883 | |
884 | return uv__fs_sendfile_emul(req); |
885 | #endif |
886 | } |
887 | |
888 | |
889 | static ssize_t uv__fs_utime(uv_fs_t* req) { |
890 | #if defined(__linux__) \ |
891 | || defined(_AIX71) \ |
892 | || defined(__sun) \ |
893 | || defined(__HAIKU__) |
894 | /* utimesat() has nanosecond resolution but we stick to microseconds |
895 | * for the sake of consistency with other platforms. |
896 | */ |
897 | struct timespec ts[2]; |
898 | ts[0].tv_sec = req->atime; |
899 | ts[0].tv_nsec = (uint64_t)(req->atime * 1000000) % 1000000 * 1000; |
900 | ts[1].tv_sec = req->mtime; |
901 | ts[1].tv_nsec = (uint64_t)(req->mtime * 1000000) % 1000000 * 1000; |
902 | return utimensat(AT_FDCWD, req->path, ts, 0); |
903 | #elif defined(__APPLE__) \ |
904 | || defined(__DragonFly__) \ |
905 | || defined(__FreeBSD__) \ |
906 | || defined(__FreeBSD_kernel__) \ |
907 | || defined(__NetBSD__) \ |
908 | || defined(__OpenBSD__) |
909 | struct timeval tv[2]; |
910 | tv[0].tv_sec = req->atime; |
911 | tv[0].tv_usec = (uint64_t)(req->atime * 1000000) % 1000000; |
912 | tv[1].tv_sec = req->mtime; |
913 | tv[1].tv_usec = (uint64_t)(req->mtime * 1000000) % 1000000; |
914 | return utimes(req->path, tv); |
915 | #elif defined(_AIX) \ |
916 | && !defined(_AIX71) |
917 | struct utimbuf buf; |
918 | buf.actime = req->atime; |
919 | buf.modtime = req->mtime; |
920 | return utime(req->path, &buf); |
921 | #elif defined(__MVS__) |
922 | attrib_t atr; |
923 | memset(&atr, 0, sizeof(atr)); |
924 | atr.att_mtimechg = 1; |
925 | atr.att_atimechg = 1; |
926 | atr.att_mtime = req->mtime; |
927 | atr.att_atime = req->atime; |
928 | return __lchattr((char*) req->path, &atr, sizeof(atr)); |
929 | #else |
930 | errno = ENOSYS; |
931 | return -1; |
932 | #endif |
933 | } |
934 | |
935 | |
936 | static ssize_t uv__fs_write(uv_fs_t* req) { |
937 | #if defined(__linux__) |
938 | static int no_pwritev; |
939 | #endif |
940 | ssize_t r; |
941 | |
942 | /* Serialize writes on OS X, concurrent write() and pwrite() calls result in |
943 | * data loss. We can't use a per-file descriptor lock, the descriptor may be |
944 | * a dup(). |
945 | */ |
946 | #if defined(__APPLE__) |
947 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
948 | |
949 | if (pthread_mutex_lock(&lock)) |
950 | abort(); |
951 | #endif |
952 | |
953 | if (req->off < 0) { |
954 | if (req->nbufs == 1) |
955 | r = write(req->file, req->bufs[0].base, req->bufs[0].len); |
956 | else |
957 | r = writev(req->file, (struct iovec*) req->bufs, req->nbufs); |
958 | } else { |
959 | if (req->nbufs == 1) { |
960 | r = pwrite(req->file, req->bufs[0].base, req->bufs[0].len, req->off); |
961 | goto done; |
962 | } |
963 | #if HAVE_PREADV |
964 | r = pwritev(req->file, (struct iovec*) req->bufs, req->nbufs, req->off); |
965 | #else |
966 | # if defined(__linux__) |
967 | if (no_pwritev) retry: |
968 | # endif |
969 | { |
970 | r = pwrite(req->file, req->bufs[0].base, req->bufs[0].len, req->off); |
971 | } |
972 | # if defined(__linux__) |
973 | else { |
974 | r = uv__pwritev(req->file, |
975 | (struct iovec*) req->bufs, |
976 | req->nbufs, |
977 | req->off); |
978 | if (r == -1 && errno == ENOSYS) { |
979 | no_pwritev = 1; |
980 | goto retry; |
981 | } |
982 | } |
983 | # endif |
984 | #endif |
985 | } |
986 | |
987 | done: |
988 | #if defined(__APPLE__) |
989 | if (pthread_mutex_unlock(&lock)) |
990 | abort(); |
991 | #endif |
992 | |
993 | return r; |
994 | } |
995 | |
996 | static ssize_t uv__fs_copyfile(uv_fs_t* req) { |
997 | uv_fs_t fs_req; |
998 | uv_file srcfd; |
999 | uv_file dstfd; |
1000 | struct stat src_statsbuf; |
1001 | struct stat dst_statsbuf; |
1002 | int dst_flags; |
1003 | int result; |
1004 | int err; |
1005 | size_t bytes_to_send; |
1006 | int64_t in_offset; |
1007 | |
1008 | dstfd = -1; |
1009 | err = 0; |
1010 | |
1011 | /* Open the source file. */ |
1012 | srcfd = uv_fs_open(NULL, &fs_req, req->path, O_RDONLY, 0, NULL); |
1013 | uv_fs_req_cleanup(&fs_req); |
1014 | |
1015 | if (srcfd < 0) |
1016 | return srcfd; |
1017 | |
1018 | /* Get the source file's mode. */ |
1019 | if (fstat(srcfd, &src_statsbuf)) { |
1020 | err = UV__ERR(errno); |
1021 | goto out; |
1022 | } |
1023 | |
1024 | dst_flags = O_WRONLY | O_CREAT | O_TRUNC; |
1025 | |
1026 | if (req->flags & UV_FS_COPYFILE_EXCL) |
1027 | dst_flags |= O_EXCL; |
1028 | |
1029 | /* Open the destination file. */ |
1030 | dstfd = uv_fs_open(NULL, |
1031 | &fs_req, |
1032 | req->new_path, |
1033 | dst_flags, |
1034 | src_statsbuf.st_mode, |
1035 | NULL); |
1036 | uv_fs_req_cleanup(&fs_req); |
1037 | |
1038 | if (dstfd < 0) { |
1039 | err = dstfd; |
1040 | goto out; |
1041 | } |
1042 | |
1043 | /* Get the destination file's mode. */ |
1044 | if (fstat(dstfd, &dst_statsbuf)) { |
1045 | err = UV__ERR(errno); |
1046 | goto out; |
1047 | } |
1048 | |
1049 | /* Check if srcfd and dstfd refer to the same file */ |
1050 | if (src_statsbuf.st_dev == dst_statsbuf.st_dev && |
1051 | src_statsbuf.st_ino == dst_statsbuf.st_ino) { |
1052 | goto out; |
1053 | } |
1054 | |
1055 | if (fchmod(dstfd, src_statsbuf.st_mode) == -1) { |
1056 | err = UV__ERR(errno); |
1057 | goto out; |
1058 | } |
1059 | |
1060 | #ifdef FICLONE |
1061 | if (req->flags & UV_FS_COPYFILE_FICLONE || |
1062 | req->flags & UV_FS_COPYFILE_FICLONE_FORCE) { |
1063 | if (ioctl(dstfd, FICLONE, srcfd) == -1) { |
1064 | /* If an error occurred that the sendfile fallback also won't handle, or |
1065 | this is a force clone then exit. Otherwise, fall through to try using |
1066 | sendfile(). */ |
1067 | if (errno != ENOTTY && errno != EOPNOTSUPP && errno != EXDEV) { |
1068 | err = UV__ERR(errno); |
1069 | goto out; |
1070 | } else if (req->flags & UV_FS_COPYFILE_FICLONE_FORCE) { |
1071 | err = UV_ENOTSUP; |
1072 | goto out; |
1073 | } |
1074 | } else { |
1075 | goto out; |
1076 | } |
1077 | } |
1078 | #else |
1079 | if (req->flags & UV_FS_COPYFILE_FICLONE_FORCE) { |
1080 | err = UV_ENOSYS; |
1081 | goto out; |
1082 | } |
1083 | #endif |
1084 | |
1085 | bytes_to_send = src_statsbuf.st_size; |
1086 | in_offset = 0; |
1087 | while (bytes_to_send != 0) { |
1088 | err = uv_fs_sendfile(NULL, |
1089 | &fs_req, |
1090 | dstfd, |
1091 | srcfd, |
1092 | in_offset, |
1093 | bytes_to_send, |
1094 | NULL); |
1095 | uv_fs_req_cleanup(&fs_req); |
1096 | if (err < 0) |
1097 | break; |
1098 | bytes_to_send -= fs_req.result; |
1099 | in_offset += fs_req.result; |
1100 | } |
1101 | |
1102 | out: |
1103 | if (err < 0) |
1104 | result = err; |
1105 | else |
1106 | result = 0; |
1107 | |
1108 | /* Close the source file. */ |
1109 | err = uv__close_nocheckstdio(srcfd); |
1110 | |
1111 | /* Don't overwrite any existing errors. */ |
1112 | if (err != 0 && result == 0) |
1113 | result = err; |
1114 | |
1115 | /* Close the destination file if it is open. */ |
1116 | if (dstfd >= 0) { |
1117 | err = uv__close_nocheckstdio(dstfd); |
1118 | |
1119 | /* Don't overwrite any existing errors. */ |
1120 | if (err != 0 && result == 0) |
1121 | result = err; |
1122 | |
1123 | /* Remove the destination file if something went wrong. */ |
1124 | if (result != 0) { |
1125 | uv_fs_unlink(NULL, &fs_req, req->new_path, NULL); |
1126 | /* Ignore the unlink return value, as an error already happened. */ |
1127 | uv_fs_req_cleanup(&fs_req); |
1128 | } |
1129 | } |
1130 | |
1131 | if (result == 0) |
1132 | return 0; |
1133 | |
1134 | errno = UV__ERR(result); |
1135 | return -1; |
1136 | } |
1137 | |
1138 | static void uv__to_stat(struct stat* src, uv_stat_t* dst) { |
1139 | dst->st_dev = src->st_dev; |
1140 | dst->st_mode = src->st_mode; |
1141 | dst->st_nlink = src->st_nlink; |
1142 | dst->st_uid = src->st_uid; |
1143 | dst->st_gid = src->st_gid; |
1144 | dst->st_rdev = src->st_rdev; |
1145 | dst->st_ino = src->st_ino; |
1146 | dst->st_size = src->st_size; |
1147 | dst->st_blksize = src->st_blksize; |
1148 | dst->st_blocks = src->st_blocks; |
1149 | |
1150 | #if defined(__APPLE__) |
1151 | dst->st_atim.tv_sec = src->st_atimespec.tv_sec; |
1152 | dst->st_atim.tv_nsec = src->st_atimespec.tv_nsec; |
1153 | dst->st_mtim.tv_sec = src->st_mtimespec.tv_sec; |
1154 | dst->st_mtim.tv_nsec = src->st_mtimespec.tv_nsec; |
1155 | dst->st_ctim.tv_sec = src->st_ctimespec.tv_sec; |
1156 | dst->st_ctim.tv_nsec = src->st_ctimespec.tv_nsec; |
1157 | dst->st_birthtim.tv_sec = src->st_birthtimespec.tv_sec; |
1158 | dst->st_birthtim.tv_nsec = src->st_birthtimespec.tv_nsec; |
1159 | dst->st_flags = src->st_flags; |
1160 | dst->st_gen = src->st_gen; |
1161 | #elif defined(__ANDROID__) |
1162 | dst->st_atim.tv_sec = src->st_atime; |
1163 | dst->st_atim.tv_nsec = src->st_atimensec; |
1164 | dst->st_mtim.tv_sec = src->st_mtime; |
1165 | dst->st_mtim.tv_nsec = src->st_mtimensec; |
1166 | dst->st_ctim.tv_sec = src->st_ctime; |
1167 | dst->st_ctim.tv_nsec = src->st_ctimensec; |
1168 | dst->st_birthtim.tv_sec = src->st_ctime; |
1169 | dst->st_birthtim.tv_nsec = src->st_ctimensec; |
1170 | dst->st_flags = 0; |
1171 | dst->st_gen = 0; |
1172 | #elif !defined(_AIX) && ( \ |
1173 | defined(__DragonFly__) || \ |
1174 | defined(__FreeBSD__) || \ |
1175 | defined(__OpenBSD__) || \ |
1176 | defined(__NetBSD__) || \ |
1177 | defined(_GNU_SOURCE) || \ |
1178 | defined(_BSD_SOURCE) || \ |
1179 | defined(_SVID_SOURCE) || \ |
1180 | defined(_XOPEN_SOURCE) || \ |
1181 | defined(_DEFAULT_SOURCE)) |
1182 | dst->st_atim.tv_sec = src->st_atim.tv_sec; |
1183 | dst->st_atim.tv_nsec = src->st_atim.tv_nsec; |
1184 | dst->st_mtim.tv_sec = src->st_mtim.tv_sec; |
1185 | dst->st_mtim.tv_nsec = src->st_mtim.tv_nsec; |
1186 | dst->st_ctim.tv_sec = src->st_ctim.tv_sec; |
1187 | dst->st_ctim.tv_nsec = src->st_ctim.tv_nsec; |
1188 | # if defined(__FreeBSD__) || \ |
1189 | defined(__NetBSD__) |
1190 | dst->st_birthtim.tv_sec = src->st_birthtim.tv_sec; |
1191 | dst->st_birthtim.tv_nsec = src->st_birthtim.tv_nsec; |
1192 | dst->st_flags = src->st_flags; |
1193 | dst->st_gen = src->st_gen; |
1194 | # else |
1195 | dst->st_birthtim.tv_sec = src->st_ctim.tv_sec; |
1196 | dst->st_birthtim.tv_nsec = src->st_ctim.tv_nsec; |
1197 | dst->st_flags = 0; |
1198 | dst->st_gen = 0; |
1199 | # endif |
1200 | #else |
1201 | dst->st_atim.tv_sec = src->st_atime; |
1202 | dst->st_atim.tv_nsec = 0; |
1203 | dst->st_mtim.tv_sec = src->st_mtime; |
1204 | dst->st_mtim.tv_nsec = 0; |
1205 | dst->st_ctim.tv_sec = src->st_ctime; |
1206 | dst->st_ctim.tv_nsec = 0; |
1207 | dst->st_birthtim.tv_sec = src->st_ctime; |
1208 | dst->st_birthtim.tv_nsec = 0; |
1209 | dst->st_flags = 0; |
1210 | dst->st_gen = 0; |
1211 | #endif |
1212 | } |
1213 | |
1214 | |
1215 | static int uv__fs_statx(int fd, |
1216 | const char* path, |
1217 | int is_fstat, |
1218 | int is_lstat, |
1219 | uv_stat_t* buf) { |
1220 | STATIC_ASSERT(UV_ENOSYS != -1); |
1221 | #ifdef __linux__ |
1222 | static int no_statx; |
1223 | struct uv__statx statxbuf; |
1224 | int dirfd; |
1225 | int flags; |
1226 | int mode; |
1227 | int rc; |
1228 | |
1229 | if (no_statx) |
1230 | return UV_ENOSYS; |
1231 | |
1232 | dirfd = AT_FDCWD; |
1233 | flags = 0; /* AT_STATX_SYNC_AS_STAT */ |
1234 | mode = 0xFFF; /* STATX_BASIC_STATS + STATX_BTIME */ |
1235 | |
1236 | if (is_fstat) { |
1237 | dirfd = fd; |
1238 | flags |= 0x1000; /* AT_EMPTY_PATH */ |
1239 | } |
1240 | |
1241 | if (is_lstat) |
1242 | flags |= AT_SYMLINK_NOFOLLOW; |
1243 | |
1244 | rc = uv__statx(dirfd, path, flags, mode, &statxbuf); |
1245 | |
1246 | if (rc == -1) { |
1247 | /* EPERM happens when a seccomp filter rejects the system call. |
1248 | * Has been observed with libseccomp < 2.3.3 and docker < 18.04. |
1249 | */ |
1250 | if (errno != EINVAL && errno != EPERM && errno != ENOSYS) |
1251 | return -1; |
1252 | |
1253 | no_statx = 1; |
1254 | return UV_ENOSYS; |
1255 | } |
1256 | |
1257 | buf->st_dev = 256 * statxbuf.stx_dev_major + statxbuf.stx_dev_minor; |
1258 | buf->st_mode = statxbuf.stx_mode; |
1259 | buf->st_nlink = statxbuf.stx_nlink; |
1260 | buf->st_uid = statxbuf.stx_uid; |
1261 | buf->st_gid = statxbuf.stx_gid; |
1262 | buf->st_rdev = statxbuf.stx_rdev_major; |
1263 | buf->st_ino = statxbuf.stx_ino; |
1264 | buf->st_size = statxbuf.stx_size; |
1265 | buf->st_blksize = statxbuf.stx_blksize; |
1266 | buf->st_blocks = statxbuf.stx_blocks; |
1267 | buf->st_atim.tv_sec = statxbuf.stx_atime.tv_sec; |
1268 | buf->st_atim.tv_nsec = statxbuf.stx_atime.tv_nsec; |
1269 | buf->st_mtim.tv_sec = statxbuf.stx_mtime.tv_sec; |
1270 | buf->st_mtim.tv_nsec = statxbuf.stx_mtime.tv_nsec; |
1271 | buf->st_ctim.tv_sec = statxbuf.stx_ctime.tv_sec; |
1272 | buf->st_ctim.tv_nsec = statxbuf.stx_ctime.tv_nsec; |
1273 | buf->st_birthtim.tv_sec = statxbuf.stx_btime.tv_sec; |
1274 | buf->st_birthtim.tv_nsec = statxbuf.stx_btime.tv_nsec; |
1275 | buf->st_flags = 0; |
1276 | buf->st_gen = 0; |
1277 | |
1278 | return 0; |
1279 | #else |
1280 | return UV_ENOSYS; |
1281 | #endif /* __linux__ */ |
1282 | } |
1283 | |
1284 | |
1285 | static int uv__fs_stat(const char *path, uv_stat_t *buf) { |
1286 | struct stat pbuf; |
1287 | int ret; |
1288 | |
1289 | ret = uv__fs_statx(-1, path, /* is_fstat */ 0, /* is_lstat */ 0, buf); |
1290 | if (ret != UV_ENOSYS) |
1291 | return ret; |
1292 | |
1293 | ret = stat(path, &pbuf); |
1294 | if (ret == 0) |
1295 | uv__to_stat(&pbuf, buf); |
1296 | |
1297 | return ret; |
1298 | } |
1299 | |
1300 | |
1301 | static int uv__fs_lstat(const char *path, uv_stat_t *buf) { |
1302 | struct stat pbuf; |
1303 | int ret; |
1304 | |
1305 | ret = uv__fs_statx(-1, path, /* is_fstat */ 0, /* is_lstat */ 1, buf); |
1306 | if (ret != UV_ENOSYS) |
1307 | return ret; |
1308 | |
1309 | ret = lstat(path, &pbuf); |
1310 | if (ret == 0) |
1311 | uv__to_stat(&pbuf, buf); |
1312 | |
1313 | return ret; |
1314 | } |
1315 | |
1316 | |
1317 | static int uv__fs_fstat(int fd, uv_stat_t *buf) { |
1318 | struct stat pbuf; |
1319 | int ret; |
1320 | |
1321 | ret = uv__fs_statx(fd, "" , /* is_fstat */ 1, /* is_lstat */ 0, buf); |
1322 | if (ret != UV_ENOSYS) |
1323 | return ret; |
1324 | |
1325 | ret = fstat(fd, &pbuf); |
1326 | if (ret == 0) |
1327 | uv__to_stat(&pbuf, buf); |
1328 | |
1329 | return ret; |
1330 | } |
1331 | |
1332 | static size_t uv__fs_buf_offset(uv_buf_t* bufs, size_t size) { |
1333 | size_t offset; |
1334 | /* Figure out which bufs are done */ |
1335 | for (offset = 0; size > 0 && bufs[offset].len <= size; ++offset) |
1336 | size -= bufs[offset].len; |
1337 | |
1338 | /* Fix a partial read/write */ |
1339 | if (size > 0) { |
1340 | bufs[offset].base += size; |
1341 | bufs[offset].len -= size; |
1342 | } |
1343 | return offset; |
1344 | } |
1345 | |
1346 | static ssize_t uv__fs_write_all(uv_fs_t* req) { |
1347 | unsigned int iovmax; |
1348 | unsigned int nbufs; |
1349 | uv_buf_t* bufs; |
1350 | ssize_t total; |
1351 | ssize_t result; |
1352 | |
1353 | iovmax = uv__getiovmax(); |
1354 | nbufs = req->nbufs; |
1355 | bufs = req->bufs; |
1356 | total = 0; |
1357 | |
1358 | while (nbufs > 0) { |
1359 | req->nbufs = nbufs; |
1360 | if (req->nbufs > iovmax) |
1361 | req->nbufs = iovmax; |
1362 | |
1363 | do |
1364 | result = uv__fs_write(req); |
1365 | while (result < 0 && errno == EINTR); |
1366 | |
1367 | if (result <= 0) { |
1368 | if (total == 0) |
1369 | total = result; |
1370 | break; |
1371 | } |
1372 | |
1373 | if (req->off >= 0) |
1374 | req->off += result; |
1375 | |
1376 | req->nbufs = uv__fs_buf_offset(req->bufs, result); |
1377 | req->bufs += req->nbufs; |
1378 | nbufs -= req->nbufs; |
1379 | total += result; |
1380 | } |
1381 | |
1382 | if (bufs != req->bufsml) |
1383 | uv__free(bufs); |
1384 | |
1385 | req->bufs = NULL; |
1386 | req->nbufs = 0; |
1387 | |
1388 | return total; |
1389 | } |
1390 | |
1391 | |
1392 | static void uv__fs_work(struct uv__work* w) { |
1393 | int retry_on_eintr; |
1394 | uv_fs_t* req; |
1395 | ssize_t r; |
1396 | |
1397 | req = container_of(w, uv_fs_t, work_req); |
1398 | retry_on_eintr = !(req->fs_type == UV_FS_CLOSE || |
1399 | req->fs_type == UV_FS_READ); |
1400 | |
1401 | do { |
1402 | errno = 0; |
1403 | |
1404 | #define X(type, action) \ |
1405 | case UV_FS_ ## type: \ |
1406 | r = action; \ |
1407 | break; |
1408 | |
1409 | switch (req->fs_type) { |
1410 | X(ACCESS, access(req->path, req->flags)); |
1411 | X(CHMOD, chmod(req->path, req->mode)); |
1412 | X(CHOWN, chown(req->path, req->uid, req->gid)); |
1413 | X(CLOSE, uv__fs_close(req->file)); |
1414 | X(COPYFILE, uv__fs_copyfile(req)); |
1415 | X(FCHMOD, fchmod(req->file, req->mode)); |
1416 | X(FCHOWN, fchown(req->file, req->uid, req->gid)); |
1417 | X(LCHOWN, lchown(req->path, req->uid, req->gid)); |
1418 | X(FDATASYNC, uv__fs_fdatasync(req)); |
1419 | X(FSTAT, uv__fs_fstat(req->file, &req->statbuf)); |
1420 | X(FSYNC, uv__fs_fsync(req)); |
1421 | X(FTRUNCATE, ftruncate(req->file, req->off)); |
1422 | X(FUTIME, uv__fs_futime(req)); |
1423 | X(LSTAT, uv__fs_lstat(req->path, &req->statbuf)); |
1424 | X(LINK, link(req->path, req->new_path)); |
1425 | X(MKDIR, mkdir(req->path, req->mode)); |
1426 | X(MKDTEMP, uv__fs_mkdtemp(req)); |
1427 | X(OPEN, uv__fs_open(req)); |
1428 | X(READ, uv__fs_read(req)); |
1429 | X(SCANDIR, uv__fs_scandir(req)); |
1430 | X(OPENDIR, uv__fs_opendir(req)); |
1431 | X(READDIR, uv__fs_readdir(req)); |
1432 | X(CLOSEDIR, uv__fs_closedir(req)); |
1433 | X(READLINK, uv__fs_readlink(req)); |
1434 | X(REALPATH, uv__fs_realpath(req)); |
1435 | X(RENAME, rename(req->path, req->new_path)); |
1436 | X(RMDIR, rmdir(req->path)); |
1437 | X(SENDFILE, uv__fs_sendfile(req)); |
1438 | X(STAT, uv__fs_stat(req->path, &req->statbuf)); |
1439 | X(STATFS, uv__fs_statfs(req)); |
1440 | X(SYMLINK, symlink(req->path, req->new_path)); |
1441 | X(UNLINK, unlink(req->path)); |
1442 | X(UTIME, uv__fs_utime(req)); |
1443 | X(WRITE, uv__fs_write_all(req)); |
1444 | default: abort(); |
1445 | } |
1446 | #undef X |
1447 | } while (r == -1 && errno == EINTR && retry_on_eintr); |
1448 | |
1449 | if (r == -1) |
1450 | req->result = UV__ERR(errno); |
1451 | else |
1452 | req->result = r; |
1453 | |
1454 | if (r == 0 && (req->fs_type == UV_FS_STAT || |
1455 | req->fs_type == UV_FS_FSTAT || |
1456 | req->fs_type == UV_FS_LSTAT)) { |
1457 | req->ptr = &req->statbuf; |
1458 | } |
1459 | } |
1460 | |
1461 | |
1462 | static void uv__fs_done(struct uv__work* w, int status) { |
1463 | uv_fs_t* req; |
1464 | |
1465 | req = container_of(w, uv_fs_t, work_req); |
1466 | uv__req_unregister(req->loop, req); |
1467 | |
1468 | if (status == UV_ECANCELED) { |
1469 | assert(req->result == 0); |
1470 | req->result = UV_ECANCELED; |
1471 | } |
1472 | |
1473 | req->cb(req); |
1474 | } |
1475 | |
1476 | |
1477 | int uv_fs_access(uv_loop_t* loop, |
1478 | uv_fs_t* req, |
1479 | const char* path, |
1480 | int flags, |
1481 | uv_fs_cb cb) { |
1482 | INIT(ACCESS); |
1483 | PATH; |
1484 | req->flags = flags; |
1485 | POST; |
1486 | } |
1487 | |
1488 | |
1489 | int uv_fs_chmod(uv_loop_t* loop, |
1490 | uv_fs_t* req, |
1491 | const char* path, |
1492 | int mode, |
1493 | uv_fs_cb cb) { |
1494 | INIT(CHMOD); |
1495 | PATH; |
1496 | req->mode = mode; |
1497 | POST; |
1498 | } |
1499 | |
1500 | |
1501 | int uv_fs_chown(uv_loop_t* loop, |
1502 | uv_fs_t* req, |
1503 | const char* path, |
1504 | uv_uid_t uid, |
1505 | uv_gid_t gid, |
1506 | uv_fs_cb cb) { |
1507 | INIT(CHOWN); |
1508 | PATH; |
1509 | req->uid = uid; |
1510 | req->gid = gid; |
1511 | POST; |
1512 | } |
1513 | |
1514 | |
1515 | int uv_fs_close(uv_loop_t* loop, uv_fs_t* req, uv_file file, uv_fs_cb cb) { |
1516 | INIT(CLOSE); |
1517 | req->file = file; |
1518 | POST; |
1519 | } |
1520 | |
1521 | |
1522 | int uv_fs_fchmod(uv_loop_t* loop, |
1523 | uv_fs_t* req, |
1524 | uv_file file, |
1525 | int mode, |
1526 | uv_fs_cb cb) { |
1527 | INIT(FCHMOD); |
1528 | req->file = file; |
1529 | req->mode = mode; |
1530 | POST; |
1531 | } |
1532 | |
1533 | |
1534 | int uv_fs_fchown(uv_loop_t* loop, |
1535 | uv_fs_t* req, |
1536 | uv_file file, |
1537 | uv_uid_t uid, |
1538 | uv_gid_t gid, |
1539 | uv_fs_cb cb) { |
1540 | INIT(FCHOWN); |
1541 | req->file = file; |
1542 | req->uid = uid; |
1543 | req->gid = gid; |
1544 | POST; |
1545 | } |
1546 | |
1547 | |
1548 | int uv_fs_lchown(uv_loop_t* loop, |
1549 | uv_fs_t* req, |
1550 | const char* path, |
1551 | uv_uid_t uid, |
1552 | uv_gid_t gid, |
1553 | uv_fs_cb cb) { |
1554 | INIT(LCHOWN); |
1555 | PATH; |
1556 | req->uid = uid; |
1557 | req->gid = gid; |
1558 | POST; |
1559 | } |
1560 | |
1561 | |
1562 | int uv_fs_fdatasync(uv_loop_t* loop, uv_fs_t* req, uv_file file, uv_fs_cb cb) { |
1563 | INIT(FDATASYNC); |
1564 | req->file = file; |
1565 | POST; |
1566 | } |
1567 | |
1568 | |
1569 | int uv_fs_fstat(uv_loop_t* loop, uv_fs_t* req, uv_file file, uv_fs_cb cb) { |
1570 | INIT(FSTAT); |
1571 | req->file = file; |
1572 | POST; |
1573 | } |
1574 | |
1575 | |
1576 | int uv_fs_fsync(uv_loop_t* loop, uv_fs_t* req, uv_file file, uv_fs_cb cb) { |
1577 | INIT(FSYNC); |
1578 | req->file = file; |
1579 | POST; |
1580 | } |
1581 | |
1582 | |
1583 | int uv_fs_ftruncate(uv_loop_t* loop, |
1584 | uv_fs_t* req, |
1585 | uv_file file, |
1586 | int64_t off, |
1587 | uv_fs_cb cb) { |
1588 | INIT(FTRUNCATE); |
1589 | req->file = file; |
1590 | req->off = off; |
1591 | POST; |
1592 | } |
1593 | |
1594 | |
1595 | int uv_fs_futime(uv_loop_t* loop, |
1596 | uv_fs_t* req, |
1597 | uv_file file, |
1598 | double atime, |
1599 | double mtime, |
1600 | uv_fs_cb cb) { |
1601 | INIT(FUTIME); |
1602 | req->file = file; |
1603 | req->atime = atime; |
1604 | req->mtime = mtime; |
1605 | POST; |
1606 | } |
1607 | |
1608 | |
1609 | int uv_fs_lstat(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb) { |
1610 | INIT(LSTAT); |
1611 | PATH; |
1612 | POST; |
1613 | } |
1614 | |
1615 | |
1616 | int uv_fs_link(uv_loop_t* loop, |
1617 | uv_fs_t* req, |
1618 | const char* path, |
1619 | const char* new_path, |
1620 | uv_fs_cb cb) { |
1621 | INIT(LINK); |
1622 | PATH2; |
1623 | POST; |
1624 | } |
1625 | |
1626 | |
1627 | int uv_fs_mkdir(uv_loop_t* loop, |
1628 | uv_fs_t* req, |
1629 | const char* path, |
1630 | int mode, |
1631 | uv_fs_cb cb) { |
1632 | INIT(MKDIR); |
1633 | PATH; |
1634 | req->mode = mode; |
1635 | POST; |
1636 | } |
1637 | |
1638 | |
1639 | int uv_fs_mkdtemp(uv_loop_t* loop, |
1640 | uv_fs_t* req, |
1641 | const char* tpl, |
1642 | uv_fs_cb cb) { |
1643 | INIT(MKDTEMP); |
1644 | req->path = uv__strdup(tpl); |
1645 | if (req->path == NULL) |
1646 | return UV_ENOMEM; |
1647 | POST; |
1648 | } |
1649 | |
1650 | |
1651 | int uv_fs_open(uv_loop_t* loop, |
1652 | uv_fs_t* req, |
1653 | const char* path, |
1654 | int flags, |
1655 | int mode, |
1656 | uv_fs_cb cb) { |
1657 | INIT(OPEN); |
1658 | PATH; |
1659 | req->flags = flags; |
1660 | req->mode = mode; |
1661 | POST; |
1662 | } |
1663 | |
1664 | |
1665 | int uv_fs_read(uv_loop_t* loop, uv_fs_t* req, |
1666 | uv_file file, |
1667 | const uv_buf_t bufs[], |
1668 | unsigned int nbufs, |
1669 | int64_t off, |
1670 | uv_fs_cb cb) { |
1671 | INIT(READ); |
1672 | |
1673 | if (bufs == NULL || nbufs == 0) |
1674 | return UV_EINVAL; |
1675 | |
1676 | req->file = file; |
1677 | |
1678 | req->nbufs = nbufs; |
1679 | req->bufs = req->bufsml; |
1680 | if (nbufs > ARRAY_SIZE(req->bufsml)) |
1681 | req->bufs = uv__malloc(nbufs * sizeof(*bufs)); |
1682 | |
1683 | if (req->bufs == NULL) |
1684 | return UV_ENOMEM; |
1685 | |
1686 | memcpy(req->bufs, bufs, nbufs * sizeof(*bufs)); |
1687 | |
1688 | req->off = off; |
1689 | POST; |
1690 | } |
1691 | |
1692 | |
1693 | int uv_fs_scandir(uv_loop_t* loop, |
1694 | uv_fs_t* req, |
1695 | const char* path, |
1696 | int flags, |
1697 | uv_fs_cb cb) { |
1698 | INIT(SCANDIR); |
1699 | PATH; |
1700 | req->flags = flags; |
1701 | POST; |
1702 | } |
1703 | |
1704 | int uv_fs_opendir(uv_loop_t* loop, |
1705 | uv_fs_t* req, |
1706 | const char* path, |
1707 | uv_fs_cb cb) { |
1708 | INIT(OPENDIR); |
1709 | PATH; |
1710 | POST; |
1711 | } |
1712 | |
1713 | int uv_fs_readdir(uv_loop_t* loop, |
1714 | uv_fs_t* req, |
1715 | uv_dir_t* dir, |
1716 | uv_fs_cb cb) { |
1717 | INIT(READDIR); |
1718 | |
1719 | if (dir == NULL || dir->dir == NULL || dir->dirents == NULL) |
1720 | return UV_EINVAL; |
1721 | |
1722 | req->ptr = dir; |
1723 | POST; |
1724 | } |
1725 | |
1726 | int uv_fs_closedir(uv_loop_t* loop, |
1727 | uv_fs_t* req, |
1728 | uv_dir_t* dir, |
1729 | uv_fs_cb cb) { |
1730 | INIT(CLOSEDIR); |
1731 | |
1732 | if (dir == NULL) |
1733 | return UV_EINVAL; |
1734 | |
1735 | req->ptr = dir; |
1736 | POST; |
1737 | } |
1738 | |
1739 | int uv_fs_readlink(uv_loop_t* loop, |
1740 | uv_fs_t* req, |
1741 | const char* path, |
1742 | uv_fs_cb cb) { |
1743 | INIT(READLINK); |
1744 | PATH; |
1745 | POST; |
1746 | } |
1747 | |
1748 | |
1749 | int uv_fs_realpath(uv_loop_t* loop, |
1750 | uv_fs_t* req, |
1751 | const char * path, |
1752 | uv_fs_cb cb) { |
1753 | INIT(REALPATH); |
1754 | PATH; |
1755 | POST; |
1756 | } |
1757 | |
1758 | |
1759 | int uv_fs_rename(uv_loop_t* loop, |
1760 | uv_fs_t* req, |
1761 | const char* path, |
1762 | const char* new_path, |
1763 | uv_fs_cb cb) { |
1764 | INIT(RENAME); |
1765 | PATH2; |
1766 | POST; |
1767 | } |
1768 | |
1769 | |
1770 | int uv_fs_rmdir(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb) { |
1771 | INIT(RMDIR); |
1772 | PATH; |
1773 | POST; |
1774 | } |
1775 | |
1776 | |
1777 | int uv_fs_sendfile(uv_loop_t* loop, |
1778 | uv_fs_t* req, |
1779 | uv_file out_fd, |
1780 | uv_file in_fd, |
1781 | int64_t off, |
1782 | size_t len, |
1783 | uv_fs_cb cb) { |
1784 | INIT(SENDFILE); |
1785 | req->flags = in_fd; /* hack */ |
1786 | req->file = out_fd; |
1787 | req->off = off; |
1788 | req->bufsml[0].len = len; |
1789 | POST; |
1790 | } |
1791 | |
1792 | |
1793 | int uv_fs_stat(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb) { |
1794 | INIT(STAT); |
1795 | PATH; |
1796 | POST; |
1797 | } |
1798 | |
1799 | |
1800 | int uv_fs_symlink(uv_loop_t* loop, |
1801 | uv_fs_t* req, |
1802 | const char* path, |
1803 | const char* new_path, |
1804 | int flags, |
1805 | uv_fs_cb cb) { |
1806 | INIT(SYMLINK); |
1807 | PATH2; |
1808 | req->flags = flags; |
1809 | POST; |
1810 | } |
1811 | |
1812 | |
1813 | int uv_fs_unlink(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb) { |
1814 | INIT(UNLINK); |
1815 | PATH; |
1816 | POST; |
1817 | } |
1818 | |
1819 | |
1820 | int uv_fs_utime(uv_loop_t* loop, |
1821 | uv_fs_t* req, |
1822 | const char* path, |
1823 | double atime, |
1824 | double mtime, |
1825 | uv_fs_cb cb) { |
1826 | INIT(UTIME); |
1827 | PATH; |
1828 | req->atime = atime; |
1829 | req->mtime = mtime; |
1830 | POST; |
1831 | } |
1832 | |
1833 | |
1834 | int uv_fs_write(uv_loop_t* loop, |
1835 | uv_fs_t* req, |
1836 | uv_file file, |
1837 | const uv_buf_t bufs[], |
1838 | unsigned int nbufs, |
1839 | int64_t off, |
1840 | uv_fs_cb cb) { |
1841 | INIT(WRITE); |
1842 | |
1843 | if (bufs == NULL || nbufs == 0) |
1844 | return UV_EINVAL; |
1845 | |
1846 | req->file = file; |
1847 | |
1848 | req->nbufs = nbufs; |
1849 | req->bufs = req->bufsml; |
1850 | if (nbufs > ARRAY_SIZE(req->bufsml)) |
1851 | req->bufs = uv__malloc(nbufs * sizeof(*bufs)); |
1852 | |
1853 | if (req->bufs == NULL) |
1854 | return UV_ENOMEM; |
1855 | |
1856 | memcpy(req->bufs, bufs, nbufs * sizeof(*bufs)); |
1857 | |
1858 | req->off = off; |
1859 | POST; |
1860 | } |
1861 | |
1862 | |
1863 | void uv_fs_req_cleanup(uv_fs_t* req) { |
1864 | if (req == NULL) |
1865 | return; |
1866 | |
1867 | /* Only necessary for asychronous requests, i.e., requests with a callback. |
1868 | * Synchronous ones don't copy their arguments and have req->path and |
1869 | * req->new_path pointing to user-owned memory. UV_FS_MKDTEMP is the |
1870 | * exception to the rule, it always allocates memory. |
1871 | */ |
1872 | if (req->path != NULL && (req->cb != NULL || req->fs_type == UV_FS_MKDTEMP)) |
1873 | uv__free((void*) req->path); /* Memory is shared with req->new_path. */ |
1874 | |
1875 | req->path = NULL; |
1876 | req->new_path = NULL; |
1877 | |
1878 | if (req->fs_type == UV_FS_READDIR && req->ptr != NULL) |
1879 | uv__fs_readdir_cleanup(req); |
1880 | |
1881 | if (req->fs_type == UV_FS_SCANDIR && req->ptr != NULL) |
1882 | uv__fs_scandir_cleanup(req); |
1883 | |
1884 | if (req->bufs != req->bufsml) |
1885 | uv__free(req->bufs); |
1886 | req->bufs = NULL; |
1887 | |
1888 | if (req->fs_type != UV_FS_OPENDIR && req->ptr != &req->statbuf) |
1889 | uv__free(req->ptr); |
1890 | req->ptr = NULL; |
1891 | } |
1892 | |
1893 | |
1894 | int uv_fs_copyfile(uv_loop_t* loop, |
1895 | uv_fs_t* req, |
1896 | const char* path, |
1897 | const char* new_path, |
1898 | int flags, |
1899 | uv_fs_cb cb) { |
1900 | INIT(COPYFILE); |
1901 | |
1902 | if (flags & ~(UV_FS_COPYFILE_EXCL | |
1903 | UV_FS_COPYFILE_FICLONE | |
1904 | UV_FS_COPYFILE_FICLONE_FORCE)) { |
1905 | return UV_EINVAL; |
1906 | } |
1907 | |
1908 | PATH2; |
1909 | req->flags = flags; |
1910 | POST; |
1911 | } |
1912 | |
1913 | |
1914 | int uv_fs_statfs(uv_loop_t* loop, |
1915 | uv_fs_t* req, |
1916 | const char* path, |
1917 | uv_fs_cb cb) { |
1918 | INIT(STATFS); |
1919 | PATH; |
1920 | POST; |
1921 | } |
1922 | |