source: mainline/uspace/lib/libc/generic/vfs/vfs.c@ 8be693b

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 8be693b was 8be693b, checked in by Jiri Svoboda <jirik.svoboda@…>, 16 years ago

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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 <sys/stat.h>
42#include <stdio.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 <ipc/devmap.h>
52#include "../../../srv/vfs/vfs.h"
53
54int vfs_phone = -1;
55futex_t vfs_phone_futex = FUTEX_INITIALIZER;
56
57futex_t cwd_futex = FUTEX_INITIALIZER;
58DIR *cwd_dir = NULL;
59char *cwd_path = NULL;
60size_t cwd_size = 0;
61
62char *absolutize(const char *path, size_t *retlen)
63{
64 char *ncwd_path;
65 char *ncwd_path_nc;
66
67 futex_down(&cwd_futex);
68 size_t size = str_size(path);
69 if (*path != '/') {
70 if (!cwd_path) {
71 futex_up(&cwd_futex);
72 return NULL;
73 }
74 ncwd_path_nc = malloc(cwd_size + 1 + size + 1);
75 if (!ncwd_path_nc) {
76 futex_up(&cwd_futex);
77 return NULL;
78 }
79 str_ncpy(ncwd_path_nc, cwd_path, cwd_size + 1 + size + 1);
80 ncwd_path_nc[cwd_size] = '/';
81 ncwd_path_nc[cwd_size + 1] = '\0';
82 } else {
83 ncwd_path_nc = malloc(size + 1);
84 if (!ncwd_path_nc) {
85 futex_up(&cwd_futex);
86 return NULL;
87 }
88 ncwd_path_nc[0] = '\0';
89 }
90 strcat(ncwd_path_nc, path);
91 ncwd_path = canonify(ncwd_path_nc, retlen);
92 if (!ncwd_path) {
93 futex_up(&cwd_futex);
94 free(ncwd_path_nc);
95 return NULL;
96 }
97 /*
98 * We need to clone ncwd_path because canonify() works in-place and thus
99 * the address in ncwd_path need not be the same as ncwd_path_nc, even
100 * though they both point into the same dynamically allocated buffer.
101 */
102 ncwd_path = strdup(ncwd_path);
103 free(ncwd_path_nc);
104 if (!ncwd_path) {
105 futex_up(&cwd_futex);
106 return NULL;
107 }
108 futex_up(&cwd_futex);
109 return ncwd_path;
110}
111
112static void vfs_connect(void)
113{
114 while (vfs_phone < 0)
115 vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
116}
117
118static int device_get_handle(const char *name, dev_handle_t *handle,
119 const unsigned int flags)
120{
121 int phone;
122
123 if (flags & IPC_FLAG_BLOCKING)
124 phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT, 0);
125 else
126 phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT, 0);
127
128 if (phone < 0)
129 return phone;
130
131 ipc_call_t answer;
132 aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,
133 &answer);
134
135 ipcarg_t retval = ipc_data_write_start(phone, name, str_size(name) + 1);
136
137 if (retval != EOK) {
138 async_wait_for(req, NULL);
139 ipc_hangup(phone);
140 return retval;
141 }
142
143 async_wait_for(req, &retval);
144
145 if (handle != NULL)
146 *handle = -1;
147
148 if (retval == EOK) {
149 if (handle != NULL)
150 *handle = (dev_handle_t) IPC_GET_ARG1(answer);
151 }
152
153 ipc_hangup(phone);
154 return retval;
155}
156
157int mount(const char *fs_name, const char *mp, const char *dev,
158 const unsigned int flags)
159{
160 int res;
161 ipcarg_t rc;
162 aid_t req;
163 dev_handle_t dev_handle;
164
165 res = device_get_handle(dev, &dev_handle, flags);
166 if (res != EOK)
167 return res;
168
169 size_t mpa_size;
170 char *mpa = absolutize(mp, &mpa_size);
171 if (!mpa)
172 return ENOMEM;
173
174 futex_down(&vfs_phone_futex);
175 async_serialize_start();
176 vfs_connect();
177
178 req = async_send_2(vfs_phone, VFS_MOUNT, dev_handle, flags, NULL);
179 rc = ipc_data_write_start(vfs_phone, (void *) mpa, mpa_size);
180 if (rc != EOK) {
181 async_wait_for(req, NULL);
182 async_serialize_end();
183 futex_up(&vfs_phone_futex);
184 free(mpa);
185 return (int) rc;
186 }
187
188 rc = ipc_data_write_start(vfs_phone, (void *) fs_name, str_size(fs_name));
189 if (rc != EOK) {
190 async_wait_for(req, NULL);
191 async_serialize_end();
192 futex_up(&vfs_phone_futex);
193 free(mpa);
194 return (int) rc;
195 }
196
197 async_wait_for(req, &rc);
198 async_serialize_end();
199 futex_up(&vfs_phone_futex);
200 free(mpa);
201
202 return (int) rc;
203}
204
205static int _open(const char *path, int lflag, int oflag, ...)
206{
207 ipcarg_t rc;
208 ipc_call_t answer;
209 aid_t req;
210
211 size_t pa_size;
212 char *pa = absolutize(path, &pa_size);
213 if (!pa)
214 return ENOMEM;
215
216 futex_down(&vfs_phone_futex);
217 async_serialize_start();
218 vfs_connect();
219
220 req = async_send_3(vfs_phone, VFS_OPEN, lflag, oflag, 0, &answer);
221 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
222 if (rc != EOK) {
223 async_wait_for(req, NULL);
224 async_serialize_end();
225 futex_up(&vfs_phone_futex);
226 free(pa);
227 return (int) rc;
228 }
229 async_wait_for(req, &rc);
230 async_serialize_end();
231 futex_up(&vfs_phone_futex);
232 free(pa);
233
234 if (rc != EOK)
235 return (int) rc;
236 return (int) IPC_GET_ARG1(answer);
237}
238
239int open(const char *path, int oflag, ...)
240{
241 return _open(path, L_FILE, oflag);
242}
243
244int close(int fildes)
245{
246 ipcarg_t rc;
247
248 futex_down(&vfs_phone_futex);
249 async_serialize_start();
250 vfs_connect();
251
252 rc = async_req_1_0(vfs_phone, VFS_CLOSE, fildes);
253
254 async_serialize_end();
255 futex_up(&vfs_phone_futex);
256
257 return (int)rc;
258}
259
260ssize_t read(int fildes, void *buf, size_t nbyte)
261{
262 ipcarg_t rc;
263 ipc_call_t answer;
264 aid_t req;
265
266 futex_down(&vfs_phone_futex);
267 async_serialize_start();
268 vfs_connect();
269
270 req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);
271 rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);
272 if (rc != EOK) {
273 async_wait_for(req, NULL);
274 async_serialize_end();
275 futex_up(&vfs_phone_futex);
276 return (ssize_t) rc;
277 }
278 async_wait_for(req, &rc);
279 async_serialize_end();
280 futex_up(&vfs_phone_futex);
281 if (rc == EOK)
282 return (ssize_t) IPC_GET_ARG1(answer);
283 else
284 return rc;
285}
286
287ssize_t write(int fildes, const void *buf, size_t nbyte)
288{
289 ipcarg_t rc;
290 ipc_call_t answer;
291 aid_t req;
292
293 futex_down(&vfs_phone_futex);
294 async_serialize_start();
295 vfs_connect();
296
297 req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);
298 rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);
299 if (rc != EOK) {
300 async_wait_for(req, NULL);
301 async_serialize_end();
302 futex_up(&vfs_phone_futex);
303 return (ssize_t) rc;
304 }
305 async_wait_for(req, &rc);
306 async_serialize_end();
307 futex_up(&vfs_phone_futex);
308 if (rc == EOK)
309 return (ssize_t) IPC_GET_ARG1(answer);
310 else
311 return -1;
312}
313
314off_t lseek(int fildes, off_t offset, int whence)
315{
316 ipcarg_t rc;
317
318 futex_down(&vfs_phone_futex);
319 async_serialize_start();
320 vfs_connect();
321
322 ipcarg_t newoffs;
323 rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,
324 &newoffs);
325
326 async_serialize_end();
327 futex_up(&vfs_phone_futex);
328
329 if (rc != EOK)
330 return (off_t) -1;
331
332 return (off_t) newoffs;
333}
334
335int ftruncate(int fildes, off_t length)
336{
337 ipcarg_t rc;
338
339 futex_down(&vfs_phone_futex);
340 async_serialize_start();
341 vfs_connect();
342
343 rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);
344 async_serialize_end();
345 futex_up(&vfs_phone_futex);
346 return (int) rc;
347}
348
349DIR *opendir(const char *dirname)
350{
351 DIR *dirp = malloc(sizeof(DIR));
352 if (!dirp)
353 return NULL;
354 dirp->fd = _open(dirname, L_DIRECTORY, 0);
355 if (dirp->fd < 0) {
356 free(dirp);
357 return NULL;
358 }
359 return dirp;
360}
361
362struct dirent *readdir(DIR *dirp)
363{
364 ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);
365 if (len <= 0)
366 return NULL;
367 return &dirp->res;
368}
369
370void rewinddir(DIR *dirp)
371{
372 (void) lseek(dirp->fd, 0, SEEK_SET);
373}
374
375int closedir(DIR *dirp)
376{
377 (void) close(dirp->fd);
378 free(dirp);
379 return 0;
380}
381
382int mkdir(const char *path, mode_t mode)
383{
384 ipcarg_t rc;
385 aid_t req;
386
387 size_t pa_size;
388 char *pa = absolutize(path, &pa_size);
389 if (!pa)
390 return ENOMEM;
391
392 futex_down(&vfs_phone_futex);
393 async_serialize_start();
394 vfs_connect();
395
396 req = async_send_1(vfs_phone, VFS_MKDIR, mode, NULL);
397 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
398 if (rc != EOK) {
399 async_wait_for(req, NULL);
400 async_serialize_end();
401 futex_up(&vfs_phone_futex);
402 free(pa);
403 return (int) rc;
404 }
405 async_wait_for(req, &rc);
406 async_serialize_end();
407 futex_up(&vfs_phone_futex);
408 free(pa);
409 return rc;
410}
411
412static int _unlink(const char *path, int lflag)
413{
414 ipcarg_t rc;
415 aid_t req;
416
417 size_t pa_size;
418 char *pa = absolutize(path, &pa_size);
419 if (!pa)
420 return ENOMEM;
421
422 futex_down(&vfs_phone_futex);
423 async_serialize_start();
424 vfs_connect();
425
426 req = async_send_0(vfs_phone, VFS_UNLINK, NULL);
427 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
428 if (rc != EOK) {
429 async_wait_for(req, NULL);
430 async_serialize_end();
431 futex_up(&vfs_phone_futex);
432 free(pa);
433 return (int) rc;
434 }
435 async_wait_for(req, &rc);
436 async_serialize_end();
437 futex_up(&vfs_phone_futex);
438 free(pa);
439 return rc;
440}
441
442int unlink(const char *path)
443{
444 return _unlink(path, L_NONE);
445}
446
447int rmdir(const char *path)
448{
449 return _unlink(path, L_DIRECTORY);
450}
451
452int rename(const char *old, const char *new)
453{
454 ipcarg_t rc;
455 aid_t req;
456
457 size_t olda_size;
458 char *olda = absolutize(old, &olda_size);
459 if (!olda)
460 return ENOMEM;
461
462 size_t newa_size;
463 char *newa = absolutize(new, &newa_size);
464 if (!newa) {
465 free(olda);
466 return ENOMEM;
467 }
468
469 futex_down(&vfs_phone_futex);
470 async_serialize_start();
471 vfs_connect();
472
473 req = async_send_0(vfs_phone, VFS_RENAME, NULL);
474 rc = ipc_data_write_start(vfs_phone, olda, olda_size);
475 if (rc != EOK) {
476 async_wait_for(req, NULL);
477 async_serialize_end();
478 futex_up(&vfs_phone_futex);
479 free(olda);
480 free(newa);
481 return (int) rc;
482 }
483 rc = ipc_data_write_start(vfs_phone, newa, newa_size);
484 if (rc != EOK) {
485 async_wait_for(req, NULL);
486 async_serialize_end();
487 futex_up(&vfs_phone_futex);
488 free(olda);
489 free(newa);
490 return (int) rc;
491 }
492 async_wait_for(req, &rc);
493 async_serialize_end();
494 futex_up(&vfs_phone_futex);
495 free(olda);
496 free(newa);
497 return rc;
498}
499
500int chdir(const char *path)
501{
502 size_t pa_size;
503 char *pa = absolutize(path, &pa_size);
504 if (!pa)
505 return ENOMEM;
506
507 DIR *d = opendir(pa);
508 if (!d) {
509 free(pa);
510 return ENOENT;
511 }
512
513 futex_down(&cwd_futex);
514 if (cwd_dir) {
515 closedir(cwd_dir);
516 cwd_dir = NULL;
517 free(cwd_path);
518 cwd_path = NULL;
519 cwd_size = 0;
520 }
521 cwd_dir = d;
522 cwd_path = pa;
523 cwd_size = pa_size;
524 futex_up(&cwd_futex);
525 return EOK;
526}
527
528char *getcwd(char *buf, size_t size)
529{
530 if (!size)
531 return NULL;
532 futex_down(&cwd_futex);
533 if (size < cwd_size + 1) {
534 futex_up(&cwd_futex);
535 return NULL;
536 }
537 str_ncpy(buf, cwd_path, size);
538 futex_up(&cwd_futex);
539 return buf;
540}
541
542/** @}
543 */
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