source: mainline/uspace/lib/libc/generic/vfs/vfs.c@ a405563

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a405563 was a405563, checked in by Jiri Svoboda <jirik.svoboda@…>, 16 years ago

Fix some warnings.
  • Property mode set to 100644
File size: 13.2 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libc
30 * @{
31 */
32/** @file
33 */
34
35#include <vfs/vfs.h>
36#include <vfs/canonify.h>
37#include <stdlib.h>
38#include <unistd.h>
39#include <dirent.h>
40#include <fcntl.h>
41#include <stdio.h>
42#include <sys/stat.h>
43#include <sys/types.h>
44#include <ipc/ipc.h>
45#include <ipc/services.h>
46#include <async.h>
47#include <atomic.h>
48#include <futex.h>
49#include <errno.h>
50#include <string.h>
51#include <devmap.h>
52#include <ipc/vfs.h>
53#include <ipc/devmap.h>
54
55static int vfs_phone = -1;
56static futex_t vfs_phone_futex = FUTEX_INITIALIZER;
57static futex_t cwd_futex = FUTEX_INITIALIZER;
58
59DIR *cwd_dir = NULL;
60char *cwd_path = NULL;
61size_t cwd_size = 0;
62
63char *absolutize(const char *path, size_t *retlen)
64{
65 char *ncwd_path;
66 char *ncwd_path_nc;
67
68 futex_down(&cwd_futex);
69 size_t size = str_size(path);
70 if (*path != '/') {
71 if (!cwd_path) {
72 futex_up(&cwd_futex);
73 return NULL;
74 }
75 ncwd_path_nc = malloc(cwd_size + 1 + size + 1);
76 if (!ncwd_path_nc) {
77 futex_up(&cwd_futex);
78 return NULL;
79 }
80 str_cpy(ncwd_path_nc, cwd_size + 1 + size + 1, cwd_path);
81 ncwd_path_nc[cwd_size] = '/';
82 ncwd_path_nc[cwd_size + 1] = '\0';
83 } else {
84 ncwd_path_nc = malloc(size + 1);
85 if (!ncwd_path_nc) {
86 futex_up(&cwd_futex);
87 return NULL;
88 }
89 ncwd_path_nc[0] = '\0';
90 }
91 str_append(ncwd_path_nc, cwd_size + 1 + size + 1, path);
92 ncwd_path = canonify(ncwd_path_nc, retlen);
93 if (!ncwd_path) {
94 futex_up(&cwd_futex);
95 free(ncwd_path_nc);
96 return NULL;
97 }
98 /*
99 * We need to clone ncwd_path because canonify() works in-place and thus
100 * the address in ncwd_path need not be the same as ncwd_path_nc, even
101 * though they both point into the same dynamically allocated buffer.
102 */
103 ncwd_path = str_dup(ncwd_path);
104 free(ncwd_path_nc);
105 if (!ncwd_path) {
106 futex_up(&cwd_futex);
107 return NULL;
108 }
109 futex_up(&cwd_futex);
110 return ncwd_path;
111}
112
113static void vfs_connect(void)
114{
115 while (vfs_phone < 0)
116 vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
117}
118
119int mount(const char *fs_name, const char *mp, const char *dev,
120 const char *opts, unsigned int flags)
121{
122 int res;
123 ipcarg_t rc;
124 aid_t req;
125 dev_handle_t dev_handle;
126
127 res = devmap_device_get_handle(dev, &dev_handle, flags);
128 if (res != EOK)
129 return res;
130
131 size_t mpa_size;
132 char *mpa = absolutize(mp, &mpa_size);
133 if (!mpa)
134 return ENOMEM;
135
136 futex_down(&vfs_phone_futex);
137 async_serialize_start();
138 vfs_connect();
139
140 req = async_send_2(vfs_phone, VFS_IN_MOUNT, dev_handle, flags, NULL);
141 rc = ipc_data_write_start(vfs_phone, (void *) mpa, mpa_size);
142 if (rc != EOK) {
143 async_wait_for(req, NULL);
144 async_serialize_end();
145 futex_up(&vfs_phone_futex);
146 free(mpa);
147 return (int) rc;
148 }
149
150 rc = ipc_data_write_start(vfs_phone, (void *) opts, str_size(opts));
151 if (rc != EOK) {
152 async_wait_for(req, NULL);
153 async_serialize_end();
154 futex_up(&vfs_phone_futex);
155 free(mpa);
156 return (int) rc;
157 }
158
159 rc = ipc_data_write_start(vfs_phone, (void *) fs_name, str_size(fs_name));
160 if (rc != EOK) {
161 async_wait_for(req, NULL);
162 async_serialize_end();
163 futex_up(&vfs_phone_futex);
164 free(mpa);
165 return (int) rc;
166 }
167
168 /* Ask VFS whether it likes fs_name. */
169 rc = async_req_0_0(vfs_phone, IPC_M_PING);
170 if (rc != EOK) {
171 async_wait_for(req, NULL);
172 async_serialize_end();
173 futex_up(&vfs_phone_futex);
174 free(mpa);
175 return (int) rc;
176 }
177
178 async_wait_for(req, &rc);
179 async_serialize_end();
180 futex_up(&vfs_phone_futex);
181 free(mpa);
182
183 return (int) rc;
184}
185
186static int _open(const char *path, int lflag, int oflag, ...)
187{
188 ipcarg_t rc;
189 ipc_call_t answer;
190 aid_t req;
191
192 size_t pa_size;
193 char *pa = absolutize(path, &pa_size);
194 if (!pa)
195 return ENOMEM;
196
197 futex_down(&vfs_phone_futex);
198 async_serialize_start();
199 vfs_connect();
200
201 req = async_send_3(vfs_phone, VFS_IN_OPEN, lflag, oflag, 0, &answer);
202 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
203 if (rc != EOK) {
204 async_wait_for(req, NULL);
205 async_serialize_end();
206 futex_up(&vfs_phone_futex);
207 free(pa);
208 return (int) rc;
209 }
210 async_wait_for(req, &rc);
211 async_serialize_end();
212 futex_up(&vfs_phone_futex);
213 free(pa);
214
215 if (rc != EOK)
216 return (int) rc;
217
218 return (int) IPC_GET_ARG1(answer);
219}
220
221int open(const char *path, int oflag, ...)
222{
223 return _open(path, L_FILE, oflag);
224}
225
226int open_node(fdi_node_t *node, int oflag)
227{
228 futex_down(&vfs_phone_futex);
229 async_serialize_start();
230 vfs_connect();
231
232 ipc_call_t answer;
233 aid_t req = async_send_4(vfs_phone, VFS_IN_OPEN_NODE, node->fs_handle,
234 node->dev_handle, node->index, oflag, &answer);
235
236 ipcarg_t rc;
237 async_wait_for(req, &rc);
238 async_serialize_end();
239 futex_up(&vfs_phone_futex);
240
241 if (rc != EOK)
242 return (int) rc;
243
244 return (int) IPC_GET_ARG1(answer);
245}
246
247int close(int fildes)
248{
249 ipcarg_t rc;
250
251 futex_down(&vfs_phone_futex);
252 async_serialize_start();
253 vfs_connect();
254
255 rc = async_req_1_0(vfs_phone, VFS_IN_CLOSE, fildes);
256
257 async_serialize_end();
258 futex_up(&vfs_phone_futex);
259
260 return (int)rc;
261}
262
263ssize_t read(int fildes, void *buf, size_t nbyte)
264{
265 ipcarg_t rc;
266 ipc_call_t answer;
267 aid_t req;
268
269 futex_down(&vfs_phone_futex);
270 async_serialize_start();
271 vfs_connect();
272
273 req = async_send_1(vfs_phone, VFS_IN_READ, fildes, &answer);
274 rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);
275 if (rc != EOK) {
276 async_wait_for(req, NULL);
277 async_serialize_end();
278 futex_up(&vfs_phone_futex);
279 return (ssize_t) rc;
280 }
281 async_wait_for(req, &rc);
282 async_serialize_end();
283 futex_up(&vfs_phone_futex);
284 if (rc == EOK)
285 return (ssize_t) IPC_GET_ARG1(answer);
286 else
287 return rc;
288}
289
290ssize_t write(int fildes, const void *buf, size_t nbyte)
291{
292 ipcarg_t rc;
293 ipc_call_t answer;
294 aid_t req;
295
296 futex_down(&vfs_phone_futex);
297 async_serialize_start();
298 vfs_connect();
299
300 req = async_send_1(vfs_phone, VFS_IN_WRITE, fildes, &answer);
301 rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);
302 if (rc != EOK) {
303 async_wait_for(req, NULL);
304 async_serialize_end();
305 futex_up(&vfs_phone_futex);
306 return (ssize_t) rc;
307 }
308 async_wait_for(req, &rc);
309 async_serialize_end();
310 futex_up(&vfs_phone_futex);
311 if (rc == EOK)
312 return (ssize_t) IPC_GET_ARG1(answer);
313 else
314 return -1;
315}
316
317int fsync(int fildes)
318{
319 futex_down(&vfs_phone_futex);
320 async_serialize_start();
321 vfs_connect();
322
323 ipcarg_t rc = async_req_1_0(vfs_phone, VFS_IN_SYNC, fildes);
324
325 async_serialize_end();
326 futex_up(&vfs_phone_futex);
327
328 return (int) rc;
329}
330
331off_t lseek(int fildes, off_t offset, int whence)
332{
333 ipcarg_t rc;
334
335 futex_down(&vfs_phone_futex);
336 async_serialize_start();
337 vfs_connect();
338
339 ipcarg_t newoffs;
340 rc = async_req_3_1(vfs_phone, VFS_IN_SEEK, fildes, offset, whence,
341 &newoffs);
342
343 async_serialize_end();
344 futex_up(&vfs_phone_futex);
345
346 if (rc != EOK)
347 return (off_t) -1;
348
349 return (off_t) newoffs;
350}
351
352int ftruncate(int fildes, off_t length)
353{
354 ipcarg_t rc;
355
356 futex_down(&vfs_phone_futex);
357 async_serialize_start();
358 vfs_connect();
359
360 rc = async_req_2_0(vfs_phone, VFS_IN_TRUNCATE, fildes, length);
361 async_serialize_end();
362 futex_up(&vfs_phone_futex);
363 return (int) rc;
364}
365
366int fstat(int fildes, struct stat *stat)
367{
368 ipcarg_t rc;
369 aid_t req;
370
371 futex_down(&vfs_phone_futex);
372 async_serialize_start();
373 vfs_connect();
374
375 req = async_send_1(vfs_phone, VFS_IN_FSTAT, fildes, NULL);
376 rc = ipc_data_read_start(vfs_phone, (void *)stat, sizeof(struct stat));
377 if (rc != EOK) {
378 async_wait_for(req, NULL);
379 async_serialize_end();
380 futex_up(&vfs_phone_futex);
381 return (ssize_t) rc;
382 }
383 async_wait_for(req, &rc);
384 async_serialize_end();
385 futex_up(&vfs_phone_futex);
386
387 return rc;
388}
389
390int stat(const char *path, struct stat *stat)
391{
392 ipcarg_t rc;
393 aid_t req;
394
395 size_t pa_size;
396 char *pa = absolutize(path, &pa_size);
397 if (!pa)
398 return ENOMEM;
399
400 futex_down(&vfs_phone_futex);
401 async_serialize_start();
402 vfs_connect();
403
404 req = async_send_0(vfs_phone, VFS_IN_STAT, NULL);
405 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
406 if (rc != EOK) {
407 async_wait_for(req, NULL);
408 async_serialize_end();
409 futex_up(&vfs_phone_futex);
410 free(pa);
411 return (int) rc;
412 }
413 rc = ipc_data_read_start(vfs_phone, stat, sizeof(struct stat));
414 if (rc != EOK) {
415 async_wait_for(req, NULL);
416 async_serialize_end();
417 futex_up(&vfs_phone_futex);
418 free(pa);
419 return (int) rc;
420 }
421 async_wait_for(req, &rc);
422 async_serialize_end();
423 futex_up(&vfs_phone_futex);
424 free(pa);
425 return rc;
426}
427
428DIR *opendir(const char *dirname)
429{
430 DIR *dirp = malloc(sizeof(DIR));
431 if (!dirp)
432 return NULL;
433 dirp->fd = _open(dirname, L_DIRECTORY, 0);
434 if (dirp->fd < 0) {
435 free(dirp);
436 return NULL;
437 }
438 return dirp;
439}
440
441struct dirent *readdir(DIR *dirp)
442{
443 ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);
444 if (len <= 0)
445 return NULL;
446 return &dirp->res;
447}
448
449void rewinddir(DIR *dirp)
450{
451 (void) lseek(dirp->fd, 0, SEEK_SET);
452}
453
454int closedir(DIR *dirp)
455{
456 (void) close(dirp->fd);
457 free(dirp);
458 return 0;
459}
460
461int mkdir(const char *path, mode_t mode)
462{
463 ipcarg_t rc;
464 aid_t req;
465
466 size_t pa_size;
467 char *pa = absolutize(path, &pa_size);
468 if (!pa)
469 return ENOMEM;
470
471 futex_down(&vfs_phone_futex);
472 async_serialize_start();
473 vfs_connect();
474
475 req = async_send_1(vfs_phone, VFS_IN_MKDIR, mode, NULL);
476 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
477 if (rc != EOK) {
478 async_wait_for(req, NULL);
479 async_serialize_end();
480 futex_up(&vfs_phone_futex);
481 free(pa);
482 return (int) rc;
483 }
484 async_wait_for(req, &rc);
485 async_serialize_end();
486 futex_up(&vfs_phone_futex);
487 free(pa);
488 return rc;
489}
490
491static int _unlink(const char *path, int lflag)
492{
493 ipcarg_t rc;
494 aid_t req;
495
496 size_t pa_size;
497 char *pa = absolutize(path, &pa_size);
498 if (!pa)
499 return ENOMEM;
500
501 futex_down(&vfs_phone_futex);
502 async_serialize_start();
503 vfs_connect();
504
505 req = async_send_0(vfs_phone, VFS_IN_UNLINK, NULL);
506 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
507 if (rc != EOK) {
508 async_wait_for(req, NULL);
509 async_serialize_end();
510 futex_up(&vfs_phone_futex);
511 free(pa);
512 return (int) rc;
513 }
514 async_wait_for(req, &rc);
515 async_serialize_end();
516 futex_up(&vfs_phone_futex);
517 free(pa);
518 return rc;
519}
520
521int unlink(const char *path)
522{
523 return _unlink(path, L_NONE);
524}
525
526int rmdir(const char *path)
527{
528 return _unlink(path, L_DIRECTORY);
529}
530
531int rename(const char *old, const char *new)
532{
533 ipcarg_t rc;
534 aid_t req;
535
536 size_t olda_size;
537 char *olda = absolutize(old, &olda_size);
538 if (!olda)
539 return ENOMEM;
540
541 size_t newa_size;
542 char *newa = absolutize(new, &newa_size);
543 if (!newa) {
544 free(olda);
545 return ENOMEM;
546 }
547
548 futex_down(&vfs_phone_futex);
549 async_serialize_start();
550 vfs_connect();
551
552 req = async_send_0(vfs_phone, VFS_IN_RENAME, NULL);
553 rc = ipc_data_write_start(vfs_phone, olda, olda_size);
554 if (rc != EOK) {
555 async_wait_for(req, NULL);
556 async_serialize_end();
557 futex_up(&vfs_phone_futex);
558 free(olda);
559 free(newa);
560 return (int) rc;
561 }
562 rc = ipc_data_write_start(vfs_phone, newa, newa_size);
563 if (rc != EOK) {
564 async_wait_for(req, NULL);
565 async_serialize_end();
566 futex_up(&vfs_phone_futex);
567 free(olda);
568 free(newa);
569 return (int) rc;
570 }
571 async_wait_for(req, &rc);
572 async_serialize_end();
573 futex_up(&vfs_phone_futex);
574 free(olda);
575 free(newa);
576 return rc;
577}
578
579int chdir(const char *path)
580{
581 size_t pa_size;
582 char *pa = absolutize(path, &pa_size);
583 if (!pa)
584 return ENOMEM;
585
586 DIR *d = opendir(pa);
587 if (!d) {
588 free(pa);
589 return ENOENT;
590 }
591
592 futex_down(&cwd_futex);
593 if (cwd_dir) {
594 closedir(cwd_dir);
595 cwd_dir = NULL;
596 free(cwd_path);
597 cwd_path = NULL;
598 cwd_size = 0;
599 }
600 cwd_dir = d;
601 cwd_path = pa;
602 cwd_size = pa_size;
603 futex_up(&cwd_futex);
604 return EOK;
605}
606
607char *getcwd(char *buf, size_t size)
608{
609 if (!size)
610 return NULL;
611 futex_down(&cwd_futex);
612 if (size < cwd_size + 1) {
613 futex_up(&cwd_futex);
614 return NULL;
615 }
616 str_cpy(buf, size, cwd_path);
617 futex_up(&cwd_futex);
618 return buf;
619}
620
621int fd_phone(int fildes)
622{
623 struct stat stat;
624 int rc;
625
626 rc = fstat(fildes, &stat);
627
628 if (!stat.devfs_stat.device)
629 return -1;
630
631 return devmap_device_connect(stat.devfs_stat.device, 0);
632}
633
634int fd_node(int fildes, fdi_node_t *node)
635{
636 struct stat stat;
637 int rc;
638
639 rc = fstat(fildes, &stat);
640
641 if (rc == EOK) {
642 node->fs_handle = stat.fs_handle;
643 node->dev_handle = stat.dev_handle;
644 node->index = stat.index;
645 }
646
647 return rc;
648}
649
650/** @}
651 */
Note: See TracBrowser for help on using the repository browser.