source: mainline/uspace/srv/fs/devfs/devfs_ops.c@ 472c09d

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 472c09d was 472c09d, checked in by Martin Decky <martin@…>, 15 years ago

more consistent naming scheme:

async_data_blob_receive → async_data_receive
async_data_string_receive → async_string_receive
CLIPBOARD_TAG_BLOB → CLIPBOARD_TAG_DATA

async_data_receive can now check the granularity of the received data
async_string_receive can now return the raw size of the received data

replace several common patterns of async_data_write_receive/_finalize
with a single async_data_receive/_string_receive (this greatly improves
code readability)
  • Property mode set to 100644
File size: 17.2 KB
Line 
1/*
2 * Copyright (c) 2009 Martin Decky
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 fs
30 * @{
31 */
32
33/**
34 * @file devfs_ops.c
35 * @brief Implementation of VFS operations for the devfs file system server.
36 */
37
38#include <ipc/ipc.h>
39#include <bool.h>
40#include <errno.h>
41#include <malloc.h>
42#include <string.h>
43#include <libfs.h>
44#include <fibril_synch.h>
45#include <adt/hash_table.h>
46#include <ipc/devmap.h>
47#include <sys/stat.h>
48#include <libfs.h>
49#include <assert.h>
50#include "devfs.h"
51#include "devfs_ops.h"
52
53typedef struct {
54 devmap_handle_type_t type;
55 dev_handle_t handle;
56} devfs_node_t;
57
58/** Opened devices structure */
59typedef struct {
60 dev_handle_t handle;
61 int phone;
62 size_t refcount;
63 link_t link;
64} device_t;
65
66/** Hash table of opened devices */
67static hash_table_t devices;
68
69/** Hash table mutex */
70static FIBRIL_MUTEX_INITIALIZE(devices_mutex);
71
72#define DEVICES_KEYS 1
73#define DEVICES_KEY_HANDLE 0
74#define DEVICES_BUCKETS 256
75
76/* Implementation of hash table interface for the nodes hash table. */
77static hash_index_t devices_hash(unsigned long key[])
78{
79 return key[DEVICES_KEY_HANDLE] % DEVICES_BUCKETS;
80}
81
82static int devices_compare(unsigned long key[], hash_count_t keys, link_t *item)
83{
84 device_t *dev = hash_table_get_instance(item, device_t, link);
85 return (dev->handle == (dev_handle_t) key[DEVICES_KEY_HANDLE]);
86}
87
88static void devices_remove_callback(link_t *item)
89{
90 free(hash_table_get_instance(item, device_t, link));
91}
92
93static hash_table_operations_t devices_ops = {
94 .hash = devices_hash,
95 .compare = devices_compare,
96 .remove_callback = devices_remove_callback
97};
98
99static int devfs_node_get_internal(fs_node_t **rfn, devmap_handle_type_t type,
100 dev_handle_t handle)
101{
102 devfs_node_t *node = (devfs_node_t *) malloc(sizeof(devfs_node_t));
103 if (node == NULL) {
104 *rfn = NULL;
105 return ENOMEM;
106 }
107
108 *rfn = (fs_node_t *) malloc(sizeof(fs_node_t));
109 if (*rfn == NULL) {
110 free(node);
111 *rfn = NULL;
112 return ENOMEM;
113 }
114
115 fs_node_initialize(*rfn);
116 node->type = type;
117 node->handle = handle;
118
119 (*rfn)->data = node;
120 return EOK;
121}
122
123static int devfs_root_get(fs_node_t **rfn, dev_handle_t dev_handle)
124{
125 return devfs_node_get_internal(rfn, DEV_HANDLE_NONE, 0);
126}
127
128static int devfs_match(fs_node_t **rfn, fs_node_t *pfn, const char *component)
129{
130 devfs_node_t *node = (devfs_node_t *) pfn->data;
131
132 if (node->handle == 0) {
133 /* Root directory */
134
135 dev_desc_t *devs;
136 size_t count = devmap_get_namespaces(&devs);
137
138 if (count > 0) {
139 size_t pos;
140 for (pos = 0; pos < count; pos++) {
141 /* Ignore root namespace */
142 if (str_cmp(devs[pos].name, "") == 0)
143 continue;
144
145 if (str_cmp(devs[pos].name, component) == 0) {
146 free(devs);
147 return devfs_node_get_internal(rfn, DEV_HANDLE_NAMESPACE, devs[pos].handle);
148 }
149 }
150
151 free(devs);
152 }
153
154 /* Search root namespace */
155 dev_handle_t namespace;
156 if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
157 count = devmap_get_devices(namespace, &devs);
158
159 if (count > 0) {
160 size_t pos;
161 for (pos = 0; pos < count; pos++) {
162 if (str_cmp(devs[pos].name, component) == 0) {
163 free(devs);
164 return devfs_node_get_internal(rfn, DEV_HANDLE_DEVICE, devs[pos].handle);
165 }
166 }
167
168 free(devs);
169 }
170 }
171
172 *rfn = NULL;
173 return EOK;
174 }
175
176 if (node->type == DEV_HANDLE_NAMESPACE) {
177 /* Namespace directory */
178
179 dev_desc_t *devs;
180 size_t count = devmap_get_devices(node->handle, &devs);
181 if (count > 0) {
182 size_t pos;
183 for (pos = 0; pos < count; pos++) {
184 if (str_cmp(devs[pos].name, component) == 0) {
185 free(devs);
186 return devfs_node_get_internal(rfn, DEV_HANDLE_DEVICE, devs[pos].handle);
187 }
188 }
189
190 free(devs);
191 }
192
193 *rfn = NULL;
194 return EOK;
195 }
196
197 *rfn = NULL;
198 return EOK;
199}
200
201static int devfs_node_get(fs_node_t **rfn, dev_handle_t dev_handle, fs_index_t index)
202{
203 return devfs_node_get_internal(rfn, devmap_handle_probe(index), index);
204}
205
206static int devfs_node_open(fs_node_t *fn)
207{
208 devfs_node_t *node = (devfs_node_t *) fn->data;
209
210 if (node->handle == 0) {
211 /* Root directory */
212 return EOK;
213 }
214
215 devmap_handle_type_t type = devmap_handle_probe(node->handle);
216
217 if (type == DEV_HANDLE_NAMESPACE) {
218 /* Namespace directory */
219 return EOK;
220 }
221
222 if (type == DEV_HANDLE_DEVICE) {
223 /* Device node */
224
225 unsigned long key[] = {
226 [DEVICES_KEY_HANDLE] = (unsigned long) node->handle
227 };
228
229 fibril_mutex_lock(&devices_mutex);
230 link_t *lnk = hash_table_find(&devices, key);
231 if (lnk == NULL) {
232 device_t *dev = (device_t *) malloc(sizeof(device_t));
233 if (dev == NULL) {
234 fibril_mutex_unlock(&devices_mutex);
235 return ENOMEM;
236 }
237
238 int phone = devmap_device_connect(node->handle, 0);
239 if (phone < 0) {
240 fibril_mutex_unlock(&devices_mutex);
241 free(dev);
242 return ENOENT;
243 }
244
245 dev->handle = node->handle;
246 dev->phone = phone;
247 dev->refcount = 1;
248
249 hash_table_insert(&devices, key, &dev->link);
250 } else {
251 device_t *dev = hash_table_get_instance(lnk, device_t, link);
252 dev->refcount++;
253 }
254
255 fibril_mutex_unlock(&devices_mutex);
256
257 return EOK;
258 }
259
260 return ENOENT;
261}
262
263static int devfs_node_put(fs_node_t *fn)
264{
265 free(fn->data);
266 free(fn);
267 return EOK;
268}
269
270static int devfs_create_node(fs_node_t **rfn, dev_handle_t dev_handle, int lflag)
271{
272 assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
273
274 *rfn = NULL;
275 return ENOTSUP;
276}
277
278static int devfs_destroy_node(fs_node_t *fn)
279{
280 return ENOTSUP;
281}
282
283static int devfs_link_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
284{
285 return ENOTSUP;
286}
287
288static int devfs_unlink_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
289{
290 return ENOTSUP;
291}
292
293static int devfs_has_children(bool *has_children, fs_node_t *fn)
294{
295 devfs_node_t *node = (devfs_node_t *) fn->data;
296
297 if (node->handle == 0) {
298 size_t count = devmap_count_namespaces();
299 if (count > 0) {
300 *has_children = true;
301 return EOK;
302 }
303
304 /* Root namespace */
305 dev_handle_t namespace;
306 if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
307 count = devmap_count_devices(namespace);
308 if (count > 0) {
309 *has_children = true;
310 return EOK;
311 }
312 }
313
314 *has_children = false;
315 return EOK;
316 }
317
318 if (node->type == DEV_HANDLE_NAMESPACE) {
319 size_t count = devmap_count_devices(node->handle);
320 if (count > 0) {
321 *has_children = true;
322 return EOK;
323 }
324
325 *has_children = false;
326 return EOK;
327 }
328
329 *has_children = false;
330 return EOK;
331}
332
333static fs_index_t devfs_index_get(fs_node_t *fn)
334{
335 devfs_node_t *node = (devfs_node_t *) fn->data;
336 return node->handle;
337}
338
339static size_t devfs_size_get(fs_node_t *fn)
340{
341 return 0;
342}
343
344static unsigned int devfs_lnkcnt_get(fs_node_t *fn)
345{
346 devfs_node_t *node = (devfs_node_t *) fn->data;
347
348 if (node->handle == 0)
349 return 0;
350
351 return 1;
352}
353
354static char devfs_plb_get_char(unsigned pos)
355{
356 return devfs_reg.plb_ro[pos % PLB_SIZE];
357}
358
359static bool devfs_is_directory(fs_node_t *fn)
360{
361 devfs_node_t *node = (devfs_node_t *) fn->data;
362
363 return ((node->type == DEV_HANDLE_NONE) || (node->type == DEV_HANDLE_NAMESPACE));
364}
365
366static bool devfs_is_file(fs_node_t *fn)
367{
368 devfs_node_t *node = (devfs_node_t *) fn->data;
369
370 return (node->type == DEV_HANDLE_DEVICE);
371}
372
373static dev_handle_t devfs_device_get(fs_node_t *fn)
374{
375 devfs_node_t *node = (devfs_node_t *) fn->data;
376
377 if (node->type == DEV_HANDLE_DEVICE)
378 return node->handle;
379
380 return 0;
381}
382
383/** libfs operations */
384libfs_ops_t devfs_libfs_ops = {
385 .root_get = devfs_root_get,
386 .match = devfs_match,
387 .node_get = devfs_node_get,
388 .node_open = devfs_node_open,
389 .node_put = devfs_node_put,
390 .create = devfs_create_node,
391 .destroy = devfs_destroy_node,
392 .link = devfs_link_node,
393 .unlink = devfs_unlink_node,
394 .has_children = devfs_has_children,
395 .index_get = devfs_index_get,
396 .size_get = devfs_size_get,
397 .lnkcnt_get = devfs_lnkcnt_get,
398 .plb_get_char = devfs_plb_get_char,
399 .is_directory = devfs_is_directory,
400 .is_file = devfs_is_file,
401 .device_get = devfs_device_get
402};
403
404bool devfs_init(void)
405{
406 if (!hash_table_create(&devices, DEVICES_BUCKETS,
407 DEVICES_KEYS, &devices_ops))
408 return false;
409
410 if (devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING) < 0)
411 return false;
412
413 return true;
414}
415
416void devfs_mounted(ipc_callid_t rid, ipc_call_t *request)
417{
418 char *opts;
419
420 /* Accept the mount options */
421 ipcarg_t retval = async_string_receive(&opts, 0, NULL);
422 if (retval != EOK) {
423 ipc_answer_0(rid, retval);
424 return;
425 }
426
427 free(opts);
428 ipc_answer_3(rid, EOK, 0, 0, 0);
429}
430
431void devfs_mount(ipc_callid_t rid, ipc_call_t *request)
432{
433 libfs_mount(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
434}
435
436void devfs_unmounted(ipc_callid_t rid, ipc_call_t *request)
437{
438 ipc_answer_0(rid, ENOTSUP);
439}
440
441void devfs_unmount(ipc_callid_t rid, ipc_call_t *request)
442{
443 libfs_unmount(&devfs_libfs_ops, rid, request);
444}
445
446void devfs_lookup(ipc_callid_t rid, ipc_call_t *request)
447{
448 libfs_lookup(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
449}
450
451void devfs_open_node(ipc_callid_t rid, ipc_call_t *request)
452{
453 libfs_open_node(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
454}
455
456void devfs_stat(ipc_callid_t rid, ipc_call_t *request)
457{
458 libfs_stat(&devfs_libfs_ops, devfs_reg.fs_handle, rid, request);
459}
460
461void devfs_read(ipc_callid_t rid, ipc_call_t *request)
462{
463 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
464 off_t pos = (off_t) IPC_GET_ARG3(*request);
465
466 if (index == 0) {
467 ipc_callid_t callid;
468 size_t size;
469 if (!async_data_read_receive(&callid, &size)) {
470 ipc_answer_0(callid, EINVAL);
471 ipc_answer_0(rid, EINVAL);
472 return;
473 }
474
475 dev_desc_t *desc;
476 size_t count = devmap_get_namespaces(&desc);
477
478 /* Get rid of root namespace */
479 size_t i;
480 for (i = 0; i < count; i++) {
481 if (str_cmp(desc[i].name, "") == 0) {
482 if (pos >= i)
483 pos++;
484
485 break;
486 }
487 }
488
489 if (pos < count) {
490 async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
491 free(desc);
492 ipc_answer_1(rid, EOK, 1);
493 return;
494 }
495
496 free(desc);
497 pos -= count;
498
499 /* Search root namespace */
500 dev_handle_t namespace;
501 if (devmap_namespace_get_handle("", &namespace, 0) == EOK) {
502 count = devmap_get_devices(namespace, &desc);
503
504 if (pos < count) {
505 async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
506 free(desc);
507 ipc_answer_1(rid, EOK, 1);
508 return;
509 }
510
511 free(desc);
512 }
513
514 ipc_answer_0(callid, ENOENT);
515 ipc_answer_1(rid, ENOENT, 0);
516 return;
517 }
518
519 devmap_handle_type_t type = devmap_handle_probe(index);
520
521 if (type == DEV_HANDLE_NAMESPACE) {
522 /* Namespace directory */
523 ipc_callid_t callid;
524 size_t size;
525 if (!async_data_read_receive(&callid, &size)) {
526 ipc_answer_0(callid, EINVAL);
527 ipc_answer_0(rid, EINVAL);
528 return;
529 }
530
531 dev_desc_t *desc;
532 size_t count = devmap_get_devices(index, &desc);
533
534 if (pos < count) {
535 async_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1);
536 free(desc);
537 ipc_answer_1(rid, EOK, 1);
538 return;
539 }
540
541 free(desc);
542 ipc_answer_0(callid, ENOENT);
543 ipc_answer_1(rid, ENOENT, 0);
544 return;
545 }
546
547 if (type == DEV_HANDLE_DEVICE) {
548 /* Device node */
549
550 unsigned long key[] = {
551 [DEVICES_KEY_HANDLE] = (unsigned long) index
552 };
553
554 fibril_mutex_lock(&devices_mutex);
555 link_t *lnk = hash_table_find(&devices, key);
556 if (lnk == NULL) {
557 fibril_mutex_unlock(&devices_mutex);
558 ipc_answer_0(rid, ENOENT);
559 return;
560 }
561
562 device_t *dev = hash_table_get_instance(lnk, device_t, link);
563
564 ipc_callid_t callid;
565 if (!async_data_read_receive(&callid, NULL)) {
566 fibril_mutex_unlock(&devices_mutex);
567 ipc_answer_0(callid, EINVAL);
568 ipc_answer_0(rid, EINVAL);
569 return;
570 }
571
572 /* Make a request at the driver */
573 ipc_call_t answer;
574 aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request),
575 IPC_GET_ARG1(*request), IPC_GET_ARG2(*request),
576 IPC_GET_ARG3(*request), &answer);
577
578 /* Forward the IPC_M_DATA_READ request to the driver */
579 ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
580 fibril_mutex_unlock(&devices_mutex);
581
582 /* Wait for reply from the driver. */
583 ipcarg_t rc;
584 async_wait_for(msg, &rc);
585 size_t bytes = IPC_GET_ARG1(answer);
586
587 /* Driver reply is the final result of the whole operation */
588 ipc_answer_1(rid, rc, bytes);
589 return;
590 }
591
592 ipc_answer_0(rid, ENOENT);
593}
594
595void devfs_write(ipc_callid_t rid, ipc_call_t *request)
596{
597 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
598 off_t pos = (off_t) IPC_GET_ARG3(*request);
599
600 if (index == 0) {
601 ipc_answer_0(rid, ENOTSUP);
602 return;
603 }
604
605 devmap_handle_type_t type = devmap_handle_probe(index);
606
607 if (type == DEV_HANDLE_NAMESPACE) {
608 /* Namespace directory */
609 ipc_answer_0(rid, ENOTSUP);
610 return;
611 }
612
613 if (type == DEV_HANDLE_DEVICE) {
614 /* Device node */
615 unsigned long key[] = {
616 [DEVICES_KEY_HANDLE] = (unsigned long) index
617 };
618
619 fibril_mutex_lock(&devices_mutex);
620 link_t *lnk = hash_table_find(&devices, key);
621 if (lnk == NULL) {
622 fibril_mutex_unlock(&devices_mutex);
623 ipc_answer_0(rid, ENOENT);
624 return;
625 }
626
627 device_t *dev = hash_table_get_instance(lnk, device_t, link);
628
629 ipc_callid_t callid;
630 if (!async_data_write_receive(&callid, NULL)) {
631 fibril_mutex_unlock(&devices_mutex);
632 ipc_answer_0(callid, EINVAL);
633 ipc_answer_0(rid, EINVAL);
634 return;
635 }
636
637 /* Make a request at the driver */
638 ipc_call_t answer;
639 aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request),
640 IPC_GET_ARG1(*request), IPC_GET_ARG2(*request),
641 IPC_GET_ARG3(*request), &answer);
642
643 /* Forward the IPC_M_DATA_WRITE request to the driver */
644 ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
645
646 fibril_mutex_unlock(&devices_mutex);
647
648 /* Wait for reply from the driver. */
649 ipcarg_t rc;
650 async_wait_for(msg, &rc);
651 size_t bytes = IPC_GET_ARG1(answer);
652
653 /* Driver reply is the final result of the whole operation */
654 ipc_answer_1(rid, rc, bytes);
655 return;
656 }
657
658 ipc_answer_0(rid, ENOENT);
659}
660
661void devfs_truncate(ipc_callid_t rid, ipc_call_t *request)
662{
663 ipc_answer_0(rid, ENOTSUP);
664}
665
666void devfs_close(ipc_callid_t rid, ipc_call_t *request)
667{
668 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
669
670 if (index == 0) {
671 ipc_answer_0(rid, EOK);
672 return;
673 }
674
675 devmap_handle_type_t type = devmap_handle_probe(index);
676
677 if (type == DEV_HANDLE_NAMESPACE) {
678 /* Namespace directory */
679 ipc_answer_0(rid, EOK);
680 return;
681 }
682
683 if (type == DEV_HANDLE_DEVICE) {
684 unsigned long key[] = {
685 [DEVICES_KEY_HANDLE] = (unsigned long) index
686 };
687
688 fibril_mutex_lock(&devices_mutex);
689 link_t *lnk = hash_table_find(&devices, key);
690 if (lnk == NULL) {
691 fibril_mutex_unlock(&devices_mutex);
692 ipc_answer_0(rid, ENOENT);
693 return;
694 }
695
696 device_t *dev = hash_table_get_instance(lnk, device_t, link);
697 dev->refcount--;
698
699 if (dev->refcount == 0) {
700 ipc_hangup(dev->phone);
701 hash_table_remove(&devices, key, DEVICES_KEYS);
702 }
703
704 fibril_mutex_unlock(&devices_mutex);
705
706 ipc_answer_0(rid, EOK);
707 return;
708 }
709
710 ipc_answer_0(rid, ENOENT);
711}
712
713void devfs_sync(ipc_callid_t rid, ipc_call_t *request)
714{
715 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
716
717 if (index == 0) {
718 ipc_answer_0(rid, EOK);
719 return;
720 }
721
722 devmap_handle_type_t type = devmap_handle_probe(index);
723
724 if (type == DEV_HANDLE_NAMESPACE) {
725 /* Namespace directory */
726 ipc_answer_0(rid, EOK);
727 return;
728 }
729
730 if (type == DEV_HANDLE_DEVICE) {
731 unsigned long key[] = {
732 [DEVICES_KEY_HANDLE] = (unsigned long) index
733 };
734
735 fibril_mutex_lock(&devices_mutex);
736 link_t *lnk = hash_table_find(&devices, key);
737 if (lnk == NULL) {
738 fibril_mutex_unlock(&devices_mutex);
739 ipc_answer_0(rid, ENOENT);
740 return;
741 }
742
743 device_t *dev = hash_table_get_instance(lnk, device_t, link);
744
745 /* Make a request at the driver */
746 ipc_call_t answer;
747 aid_t msg = async_send_2(dev->phone, IPC_GET_METHOD(*request),
748 IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), &answer);
749
750 fibril_mutex_unlock(&devices_mutex);
751
752 /* Wait for reply from the driver */
753 ipcarg_t rc;
754 async_wait_for(msg, &rc);
755
756 /* Driver reply is the final result of the whole operation */
757 ipc_answer_0(rid, rc);
758 return;
759 }
760
761 ipc_answer_0(rid, ENOENT);
762}
763
764void devfs_destroy(ipc_callid_t rid, ipc_call_t *request)
765{
766 ipc_answer_0(rid, ENOTSUP);
767}
768
769/**
770 * @}
771 */
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