forked from adamlaska/systemd
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathlibudev-device.c
More file actions
905 lines (754 loc) · 27.4 KB
/
libudev-device.c
File metadata and controls
905 lines (754 loc) · 27.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/sockios.h>
#include <net/if.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include "libudev.h"
#include "sd-device.h"
#include "alloc-util.h"
#include "device-private.h"
#include "device-util.h"
#include "libudev-device-internal.h"
#include "libudev-list-internal.h"
#include "parse-util.h"
#include "time-util.h"
/**
* SECTION:libudev-device
* @short_description: kernel sys devices
*
* Representation of kernel sys devices. Devices are uniquely identified
* by their syspath, every device has exactly one path in the kernel sys
* filesystem. Devices usually belong to a kernel subsystem, and have
* a unique name inside that subsystem.
*/
/**
* udev_device:
*
* Opaque object representing one kernel sys device.
*/
struct udev_device {
struct udev *udev;
/* real device object */
sd_device *device;
/* legacy */
unsigned n_ref;
struct udev_device *parent;
bool parent_set;
struct udev_list *properties;
uint64_t properties_generation;
struct udev_list *all_tags, *current_tags;
uint64_t all_tags_generation, current_tags_generation;
struct udev_list *devlinks;
uint64_t devlinks_generation;
bool properties_read:1;
bool all_tags_read:1;
bool current_tags_read:1;
bool devlinks_read:1;
struct udev_list *sysattrs;
bool sysattrs_read;
};
/**
* udev_device_get_seqnum:
* @udev_device: udev device
*
* This is only valid if the device was received through a monitor. Devices read from
* sys do not have a sequence number.
*
* Returns: the kernel event sequence number, or 0 if there is no sequence number available.
**/
_public_ unsigned long long udev_device_get_seqnum(struct udev_device *udev_device) {
uint64_t seqnum;
assert_return_errno(udev_device, 0, EINVAL);
if (sd_device_get_seqnum(udev_device->device, &seqnum) < 0)
return 0;
return seqnum;
}
/**
* udev_device_get_devnum:
* @udev_device: udev device
*
* Get the device major/minor number.
*
* Returns: the dev_t number.
**/
_public_ dev_t udev_device_get_devnum(struct udev_device *udev_device) {
dev_t devnum;
int r;
assert_return_errno(udev_device, makedev(0, 0), EINVAL);
r = sd_device_get_devnum(udev_device->device, &devnum);
if (r == -ENOENT)
return makedev(0, 0);
if (r < 0)
return_with_errno(makedev(0, 0), r);
return devnum;
}
/**
* udev_device_get_driver:
* @udev_device: udev device
*
* Get the kernel driver name.
*
* Returns: the driver name string, or #NULL if there is no driver attached.
**/
_public_ const char *udev_device_get_driver(struct udev_device *udev_device) {
const char *driver;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_driver(udev_device->device, &driver);
if (r < 0)
return_with_errno(NULL, r);
return driver;
}
/**
* udev_device_get_devtype:
* @udev_device: udev device
*
* Retrieve the devtype string of the udev device.
*
* Returns: the devtype name of the udev device, or #NULL if it cannot be determined
**/
_public_ const char *udev_device_get_devtype(struct udev_device *udev_device) {
const char *devtype;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_devtype(udev_device->device, &devtype);
if (r == -ENOENT)
return NULL;
if (r < 0)
return_with_errno(NULL, r);
return devtype;
}
/**
* udev_device_get_subsystem:
* @udev_device: udev device
*
* Retrieve the subsystem string of the udev device. The string does not
* contain any "/".
*
* Returns: the subsystem name of the udev device, or #NULL if it cannot be determined
**/
_public_ const char *udev_device_get_subsystem(struct udev_device *udev_device) {
const char *subsystem;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_subsystem(udev_device->device, &subsystem);
if (r < 0)
return_with_errno(NULL, r);
return subsystem;
}
/**
* udev_device_get_property_value:
* @udev_device: udev device
* @key: property name
*
* Get the value of a given property.
*
* Returns: the property string, or #NULL if there is no such property.
**/
_public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key) {
const char *value;
int r;
assert_return_errno(udev_device && key, NULL, EINVAL);
r = sd_device_get_property_value(udev_device->device, key, &value);
if (r < 0)
return_with_errno(NULL, r);
return value;
}
struct udev_device *udev_device_new(struct udev *udev, sd_device *device) {
_cleanup_(udev_list_freep) struct udev_list *properties = NULL, *all_tags = NULL, *current_tags = NULL, *sysattrs = NULL, *devlinks = NULL;
struct udev_device *udev_device;
assert(device);
properties = udev_list_new(true);
if (!properties)
return_with_errno(NULL, ENOMEM);
all_tags = udev_list_new(true);
if (!all_tags)
return_with_errno(NULL, ENOMEM);
current_tags = udev_list_new(true);
if (!current_tags)
return_with_errno(NULL, ENOMEM);
sysattrs = udev_list_new(true);
if (!sysattrs)
return_with_errno(NULL, ENOMEM);
devlinks = udev_list_new(true);
if (!devlinks)
return_with_errno(NULL, ENOMEM);
udev_device = new(struct udev_device, 1);
if (!udev_device)
return_with_errno(NULL, ENOMEM);
*udev_device = (struct udev_device) {
.n_ref = 1,
.udev = udev,
.device = sd_device_ref(device),
.properties = TAKE_PTR(properties),
.all_tags = TAKE_PTR(all_tags),
.current_tags = TAKE_PTR(current_tags),
.sysattrs = TAKE_PTR(sysattrs),
.devlinks = TAKE_PTR(devlinks),
};
return udev_device;
}
/**
* udev_device_new_from_syspath:
* @udev: udev library context
* @syspath: sys device path including sys directory
*
* Create new udev device, and fill in information from the sys
* device and the udev database entry. The syspath is the absolute
* path to the device, including the sys mount point.
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
_public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
r = sd_device_new_from_syspath(&device, syspath);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(udev, device);
}
/**
* udev_device_new_from_devnum:
* @udev: udev library context
* @type: char or block device
* @devnum: device major/minor number
*
* Create new udev device, and fill in information from the sys
* device and the udev database entry. The device is looked-up
* by its major/minor number and type. Character and block device
* numbers are not unique across the two types.
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
_public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
r = sd_device_new_from_devnum(&device, type, devnum);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(udev, device);
}
/**
* udev_device_new_from_device_id:
* @udev: udev library context
* @id: text string identifying a kernel device
*
* Create new udev device, and fill in information from the sys
* device and the udev database entry. The device is looked-up
* by a special string:
* b8:2 - block device major:minor
* c128:1 - char device major:minor
* n3 - network device ifindex
* +sound:card29 - kernel driver core subsystem:device name
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
_public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
r = sd_device_new_from_device_id(&device, id);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(udev, device);
}
/**
* udev_device_new_from_subsystem_sysname:
* @udev: udev library context
* @subsystem: the subsystem of the device
* @sysname: the name of the device
*
* Create new udev device, and fill in information from the sys device
* and the udev database entry. The device is looked up by the subsystem
* and name string of the device, like "mem" / "zero", or "block" / "sda".
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
_public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
r = sd_device_new_from_subsystem_sysname(&device, subsystem, sysname);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(udev, device);
}
/**
* udev_device_new_from_environment
* @udev: udev library context
*
* Create new udev device, and fill in information from the
* current process environment. This only works reliably if
* the process is called from a udev rule. It is usually used
* for tools executed from IMPORT= rules.
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
_public_ struct udev_device *udev_device_new_from_environment(struct udev *udev) {
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
int r;
r = device_new_from_strv(&device, environ);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(udev, device);
}
static struct udev_device *device_new_from_parent(struct udev_device *child) {
sd_device *parent;
int r;
assert_return_errno(child, NULL, EINVAL);
r = sd_device_get_parent(child->device, &parent);
if (r < 0)
return_with_errno(NULL, r);
return udev_device_new(child->udev, parent);
}
/**
* udev_device_get_parent:
* @udev_device: the device to start searching from
*
* Find the next parent device, and fill in information from the sys
* device and the udev database entry.
*
* Returned device is not referenced. It is attached to the child
* device, and will be cleaned up when the child device is cleaned up.
*
* It is not necessarily just the upper level directory, empty or not
* recognized sys directories are ignored.
*
* It can be called as many times as needed, without caring about
* references.
*
* Returns: a new udev device, or #NULL, if it no parent exist.
**/
_public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (!udev_device->parent_set) {
udev_device->parent_set = true;
udev_device->parent = device_new_from_parent(udev_device);
}
/* TODO: errno will differ here in case parent == NULL */
return udev_device->parent;
}
/**
* udev_device_get_parent_with_subsystem_devtype:
* @udev_device: udev device to start searching from
* @subsystem: the subsystem of the device
* @devtype: the type (DEVTYPE) of the device
*
* Find the next parent device, with a matching subsystem and devtype
* value, and fill in information from the sys device and the udev
* database entry.
*
* If devtype is #NULL, only subsystem is checked, and any devtype will
* match.
*
* Returned device is not referenced. It is attached to the child
* device, and will be cleaned up when the child device is cleaned up.
*
* It can be called as many times as needed, without caring about
* references.
*
* Returns: a new udev device, or #NULL if no matching parent exists.
**/
_public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype) {
sd_device *parent;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
/* this relies on the fact that finding the subdevice of a parent or the
parent of a subdevice commute */
/* first find the correct sd_device */
r = sd_device_get_parent_with_subsystem_devtype(udev_device->device, subsystem, devtype, &parent);
if (r < 0)
return_with_errno(NULL, r);
/* then walk the chain of udev_device parents until the corresponding
one is found */
while ((udev_device = udev_device_get_parent(udev_device)))
if (udev_device->device == parent)
return udev_device;
return_with_errno(NULL, ENOENT);
}
/**
* udev_device_get_udev:
* @udev_device: udev device
*
* Retrieve the udev library context the device was created with.
*
* Returns: the udev library context
**/
_public_ struct udev *udev_device_get_udev(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
return udev_device->udev;
}
static struct udev_device *udev_device_free(struct udev_device *udev_device) {
assert(udev_device);
sd_device_unref(udev_device->device);
udev_device_unref(udev_device->parent);
udev_list_free(udev_device->properties);
udev_list_free(udev_device->sysattrs);
udev_list_free(udev_device->all_tags);
udev_list_free(udev_device->current_tags);
udev_list_free(udev_device->devlinks);
return mfree(udev_device);
}
/**
* udev_device_ref:
* @udev_device: udev device
*
* Take a reference of a udev device.
*
* Returns: the passed udev device
**/
/**
* udev_device_unref:
* @udev_device: udev device
*
* Drop a reference of a udev device. If the refcount reaches zero,
* the resources of the device will be released.
*
* Returns: #NULL
**/
DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_device, udev_device, udev_device_free);
/**
* udev_device_get_devpath:
* @udev_device: udev device
*
* Retrieve the kernel devpath value of the udev device. The path
* does not contain the sys mount point, and starts with a '/'.
*
* Returns: the devpath of the udev device
**/
_public_ const char *udev_device_get_devpath(struct udev_device *udev_device) {
const char *devpath;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_devpath(udev_device->device, &devpath);
if (r < 0)
return_with_errno(NULL, r);
return devpath;
}
/**
* udev_device_get_syspath:
* @udev_device: udev device
*
* Retrieve the sys path of the udev device. The path is an
* absolute path and starts with the sys mount point.
*
* Returns: the sys path of the udev device
**/
_public_ const char *udev_device_get_syspath(struct udev_device *udev_device) {
const char *syspath;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_syspath(udev_device->device, &syspath);
if (r < 0)
return_with_errno(NULL, r);
return syspath;
}
/**
* udev_device_get_sysname:
* @udev_device: udev device
*
* Get the kernel device name in /sys.
*
* Returns: the name string of the device
**/
_public_ const char *udev_device_get_sysname(struct udev_device *udev_device) {
const char *sysname;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_sysname(udev_device->device, &sysname);
if (r < 0)
return_with_errno(NULL, r);
return sysname;
}
/**
* udev_device_get_sysnum:
* @udev_device: udev device
*
* Get the instance number of the device.
*
* Returns: the trailing number string of the device name
**/
_public_ const char *udev_device_get_sysnum(struct udev_device *udev_device) {
const char *sysnum;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_sysnum(udev_device->device, &sysnum);
if (r == -ENOENT)
return NULL;
if (r < 0)
return_with_errno(NULL, r);
return sysnum;
}
/**
* udev_device_get_devnode:
* @udev_device: udev device
*
* Retrieve the device node file name belonging to the udev device.
* The path is an absolute path, and starts with the device directory.
*
* Returns: the device node file name of the udev device, or #NULL if no device node exists
**/
_public_ const char *udev_device_get_devnode(struct udev_device *udev_device) {
const char *devnode;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_devname(udev_device->device, &devnode);
if (r < 0)
return_with_errno(NULL, r);
return devnode;
}
/**
* udev_device_get_devlinks_list_entry:
* @udev_device: udev device
*
* Retrieve the list of device links pointing to the device file of
* the udev device. The next list entry can be retrieved with
* udev_list_entry_get_next(), which returns #NULL if no more entries exist.
* The devlink path can be retrieved from the list entry by
* udev_list_entry_get_name(). The path is an absolute path, and starts with
* the device directory.
*
* Returns: the first entry of the device node link list
**/
_public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_devlinks_generation(udev_device->device) != udev_device->devlinks_generation ||
!udev_device->devlinks_read) {
const char *devlink;
udev_list_cleanup(udev_device->devlinks);
FOREACH_DEVICE_DEVLINK(udev_device->device, devlink)
if (!udev_list_entry_add(udev_device->devlinks, devlink, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->devlinks_read = true;
udev_device->devlinks_generation = device_get_devlinks_generation(udev_device->device);
}
return udev_list_get_entry(udev_device->devlinks);
}
/**
* udev_device_get_event_properties_entry:
* @udev_device: udev device
*
* Retrieve the list of key/value device properties of the udev
* device. The next list entry can be retrieved with udev_list_entry_get_next(),
* which returns #NULL if no more entries exist. The property name
* can be retrieved from the list entry by udev_list_entry_get_name(),
* the property value by udev_list_entry_get_value().
*
* Returns: the first entry of the property list
**/
_public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_properties_generation(udev_device->device) != udev_device->properties_generation ||
!udev_device->properties_read) {
const char *key, *value;
udev_list_cleanup(udev_device->properties);
FOREACH_DEVICE_PROPERTY(udev_device->device, key, value)
if (!udev_list_entry_add(udev_device->properties, key, value))
return_with_errno(NULL, ENOMEM);
udev_device->properties_read = true;
udev_device->properties_generation = device_get_properties_generation(udev_device->device);
}
return udev_list_get_entry(udev_device->properties);
}
/**
* udev_device_get_action:
* @udev_device: udev device
*
* This is only valid if the device was received through a monitor. Devices read from
* sys do not have an action string. Usual actions are: add, remove, change, move,
* online, offline.
*
* Returns: the kernel action value, or #NULL if there is no action value available.
**/
_public_ const char *udev_device_get_action(struct udev_device *udev_device) {
sd_device_action_t action;
assert_return_errno(udev_device, NULL, EINVAL);
if (sd_device_get_action(udev_device->device, &action) < 0)
return NULL;
return device_action_to_string(action);
}
/**
* udev_device_get_usec_since_initialized:
* @udev_device: udev device
*
* Return the number of microseconds passed since udev set up the
* device for the first time.
*
* This is only implemented for devices with need to store properties
* in the udev database. All other devices return 0 here.
*
* Returns: the number of microseconds since the device was first seen.
**/
_public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device) {
usec_t ts;
int r;
assert_return(udev_device, -EINVAL);
r = sd_device_get_usec_since_initialized(udev_device->device, &ts);
if (r < 0)
return_with_errno(0, r);
return ts;
}
/**
* udev_device_get_sysattr_value:
* @udev_device: udev device
* @sysattr: attribute name
*
* The retrieved value is cached in the device. Repeated calls will return the same
* value and not open the attribute again.
*
* Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
**/
_public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr) {
const char *value;
int r;
assert_return_errno(udev_device, NULL, EINVAL);
r = sd_device_get_sysattr_value(udev_device->device, sysattr, &value);
if (r < 0)
return_with_errno(NULL, r);
return value;
}
/**
* udev_device_set_sysattr_value:
* @udev_device: udev device
* @sysattr: attribute name
* @value: new value to be set
*
* Update the contents of the sys attribute and the cached value of the device.
*
* Returns: Negative error code on failure or 0 on success.
**/
_public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, const char *value) {
int r;
assert_return(udev_device, -EINVAL);
r = sd_device_set_sysattr_value(udev_device->device, sysattr, value);
if (r < 0)
return r;
return 0;
}
/**
* udev_device_get_sysattr_list_entry:
* @udev_device: udev device
*
* Retrieve the list of available sysattrs, with value being empty;
* This just return all available sysfs attributes for a particular
* device without reading their values.
*
* Returns: the first entry of the property list
**/
_public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (!udev_device->sysattrs_read) {
const char *sysattr;
udev_list_cleanup(udev_device->sysattrs);
FOREACH_DEVICE_SYSATTR(udev_device->device, sysattr)
if (!udev_list_entry_add(udev_device->sysattrs, sysattr, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->sysattrs_read = true;
}
return udev_list_get_entry(udev_device->sysattrs);
}
/**
* udev_device_get_is_initialized:
* @udev_device: udev device
*
* Check if udev has already handled the device and has set up
* device node permissions and context, or has renamed a network
* device.
*
* This is only implemented for devices with a device node
* or network interfaces. All other devices return 1 here.
*
* Returns: 1 if the device is set up. 0 otherwise.
**/
_public_ int udev_device_get_is_initialized(struct udev_device *udev_device) {
int r;
assert_return(udev_device, -EINVAL);
r = sd_device_get_is_initialized(udev_device->device);
if (r < 0)
return_with_errno(0, r);
return r;
}
/**
* udev_device_get_tags_list_entry:
* @udev_device: udev device
*
* Retrieve the list of tags attached to the udev device. The next
* list entry can be retrieved with udev_list_entry_get_next(),
* which returns #NULL if no more entries exist. The tag string
* can be retrieved from the list entry by udev_list_entry_get_name().
*
* Returns: the first entry of the tag list
**/
_public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_tags_generation(udev_device->device) != udev_device->all_tags_generation ||
!udev_device->all_tags_read) {
const char *tag;
udev_list_cleanup(udev_device->all_tags);
FOREACH_DEVICE_TAG(udev_device->device, tag)
if (!udev_list_entry_add(udev_device->all_tags, tag, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->all_tags_read = true;
udev_device->all_tags_generation = device_get_tags_generation(udev_device->device);
}
return udev_list_get_entry(udev_device->all_tags);
}
_public_ struct udev_list_entry *udev_device_get_current_tags_list_entry(struct udev_device *udev_device) {
assert_return_errno(udev_device, NULL, EINVAL);
if (device_get_tags_generation(udev_device->device) != udev_device->current_tags_generation ||
!udev_device->current_tags_read) {
const char *tag;
udev_list_cleanup(udev_device->current_tags);
FOREACH_DEVICE_CURRENT_TAG(udev_device->device, tag)
if (!udev_list_entry_add(udev_device->current_tags, tag, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->current_tags_read = true;
udev_device->current_tags_generation = device_get_tags_generation(udev_device->device);
}
return udev_list_get_entry(udev_device->current_tags);
}
/**
* udev_device_has_tag:
* @udev_device: udev device
* @tag: tag name
*
* Check if a given device has a certain tag associated.
*
* Returns: 1 if the tag is found. 0 otherwise.
**/
_public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag) {
assert_return(udev_device, 0);
return sd_device_has_tag(udev_device->device, tag) > 0;
}
_public_ int udev_device_has_current_tag(struct udev_device *udev_device, const char *tag) {
assert_return(udev_device, 0);
return sd_device_has_current_tag(udev_device->device, tag) > 0;
}
sd_device *udev_device_get_sd_device(struct udev_device *udev_device) {
assert(udev_device);
return udev_device->device;
}