2 This file is part of systemd.
4 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
32 #include <sys/ioctl.h>
33 #include <sys/socket.h>
34 #include <linux/sockios.h>
37 #include "libudev-private.h"
39 static int udev_device_set_devnode(struct udev_device
*udev_device
, const char *devnode
);
42 * SECTION:libudev-device
43 * @short_description: kernel sys devices
45 * Representation of kernel sys devices. Devices are uniquely identified
46 * by their syspath, every device has exactly one path in the kernel sys
47 * filesystem. Devices usually belong to a kernel subsystem, and have
48 * a unique name inside that subsystem.
54 * Opaque object representing one kernel sys device.
58 struct udev_device
*parent_device
;
75 size_t monitor_buf_len
;
76 struct udev_list devlinks_list
;
77 struct udev_list properties_list
;
78 struct udev_list sysattr_value_list
;
79 struct udev_list sysattr_list
;
80 struct udev_list tags_list
;
81 unsigned long long int seqnum
;
82 usec_t usec_initialized
;
92 bool devlinks_uptodate
;
100 bool sysattr_list_read
;
105 * udev_device_get_seqnum:
106 * @udev_device: udev device
108 * This is only valid if the device was received through a monitor. Devices read from
109 * sys do not have a sequence number.
111 * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
113 _public_
unsigned long long int udev_device_get_seqnum(struct udev_device
*udev_device
)
115 if (udev_device
== NULL
)
117 return udev_device
->seqnum
;
120 static int udev_device_set_seqnum(struct udev_device
*udev_device
, unsigned long long int seqnum
)
124 udev_device
->seqnum
= seqnum
;
125 snprintf(num
, sizeof(num
), "%llu", seqnum
);
126 udev_device_add_property(udev_device
, "SEQNUM", num
);
130 int udev_device_get_ifindex(struct udev_device
*udev_device
)
132 if (!udev_device
->info_loaded
)
133 udev_device_read_uevent_file(udev_device
);
134 return udev_device
->ifindex
;
137 static int udev_device_set_ifindex(struct udev_device
*udev_device
, int ifindex
)
141 udev_device
->ifindex
= ifindex
;
142 snprintf(num
, sizeof(num
), "%u", ifindex
);
143 udev_device_add_property(udev_device
, "IFINDEX", num
);
148 * udev_device_get_devnum:
149 * @udev_device: udev device
151 * Get the device major/minor number.
153 * Returns: the dev_t number.
155 _public_ dev_t
udev_device_get_devnum(struct udev_device
*udev_device
)
157 if (udev_device
== NULL
)
158 return makedev(0, 0);
159 if (!udev_device
->info_loaded
)
160 udev_device_read_uevent_file(udev_device
);
161 return udev_device
->devnum
;
164 int udev_device_set_devnum(struct udev_device
*udev_device
, dev_t devnum
)
168 udev_device
->devnum
= devnum
;
170 snprintf(num
, sizeof(num
), "%u", major(devnum
));
171 udev_device_add_property(udev_device
, "MAJOR", num
);
172 snprintf(num
, sizeof(num
), "%u", minor(devnum
));
173 udev_device_add_property(udev_device
, "MINOR", num
);
177 const char *udev_device_get_devpath_old(struct udev_device
*udev_device
)
179 return udev_device
->devpath_old
;
182 static int udev_device_set_devpath_old(struct udev_device
*udev_device
, const char *devpath_old
)
186 free(udev_device
->devpath_old
);
187 udev_device
->devpath_old
= strdup(devpath_old
);
188 if (udev_device
->devpath_old
== NULL
)
190 udev_device_add_property(udev_device
, "DEVPATH_OLD", udev_device
->devpath_old
);
192 pos
= strrchr(udev_device
->devpath_old
, '/');
199 * udev_device_get_driver:
200 * @udev_device: udev device
202 * Get the kernel driver name.
204 * Returns: the driver name string, or #NULL if there is no driver attached.
206 _public_
const char *udev_device_get_driver(struct udev_device
*udev_device
)
208 char driver
[UTIL_NAME_SIZE
];
210 if (udev_device
== NULL
)
212 if (!udev_device
->driver_set
) {
213 udev_device
->driver_set
= true;
214 if (util_get_sys_core_link_value(udev_device
->udev
, "driver", udev_device
->syspath
, driver
, sizeof(driver
)) > 0)
215 udev_device
->driver
= strdup(driver
);
217 return udev_device
->driver
;
220 static int udev_device_set_driver(struct udev_device
*udev_device
, const char *driver
)
222 free(udev_device
->driver
);
223 udev_device
->driver
= strdup(driver
);
224 if (udev_device
->driver
== NULL
)
226 udev_device
->driver_set
= true;
227 udev_device_add_property(udev_device
, "DRIVER", udev_device
->driver
);
232 * udev_device_get_devtype:
233 * @udev_device: udev device
235 * Retrieve the devtype string of the udev device.
237 * Returns: the devtype name of the udev device, or #NULL if it can not be determined
239 _public_
const char *udev_device_get_devtype(struct udev_device
*udev_device
)
241 if (udev_device
== NULL
)
243 if (!udev_device
->devtype_set
) {
244 udev_device
->devtype_set
= true;
245 udev_device_read_uevent_file(udev_device
);
247 return udev_device
->devtype
;
250 static int udev_device_set_devtype(struct udev_device
*udev_device
, const char *devtype
)
252 free(udev_device
->devtype
);
253 udev_device
->devtype
= strdup(devtype
);
254 if (udev_device
->devtype
== NULL
)
256 udev_device
->devtype_set
= true;
257 udev_device_add_property(udev_device
, "DEVTYPE", udev_device
->devtype
);
261 int udev_device_set_subsystem(struct udev_device
*udev_device
, const char *subsystem
)
263 free(udev_device
->subsystem
);
264 udev_device
->subsystem
= strdup(subsystem
);
265 if (udev_device
->subsystem
== NULL
)
267 udev_device
->subsystem_set
= true;
268 udev_device_add_property(udev_device
, "SUBSYSTEM", udev_device
->subsystem
);
273 * udev_device_get_subsystem:
274 * @udev_device: udev device
276 * Retrieve the subsystem string of the udev device. The string does not
279 * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
281 _public_
const char *udev_device_get_subsystem(struct udev_device
*udev_device
)
283 char subsystem
[UTIL_NAME_SIZE
];
285 if (udev_device
== NULL
)
287 if (!udev_device
->subsystem_set
) {
288 udev_device
->subsystem_set
= true;
289 /* read "subsystem" link */
290 if (util_get_sys_core_link_value(udev_device
->udev
, "subsystem", udev_device
->syspath
, subsystem
, sizeof(subsystem
)) > 0) {
291 udev_device_set_subsystem(udev_device
, subsystem
);
292 return udev_device
->subsystem
;
295 if (startswith(udev_device
->devpath
, "/module/")) {
296 udev_device_set_subsystem(udev_device
, "module");
297 return udev_device
->subsystem
;
299 if (strstr(udev_device
->devpath
, "/drivers/") != NULL
) {
300 udev_device_set_subsystem(udev_device
, "drivers");
301 return udev_device
->subsystem
;
303 if (startswith(udev_device
->devpath
, "/subsystem/") ||
304 startswith(udev_device
->devpath
, "/class/") ||
305 startswith(udev_device
->devpath
, "/bus/")) {
306 udev_device_set_subsystem(udev_device
, "subsystem");
307 return udev_device
->subsystem
;
310 return udev_device
->subsystem
;
313 mode_t
udev_device_get_devnode_mode(struct udev_device
*udev_device
)
315 if (!udev_device
->info_loaded
)
316 udev_device_read_uevent_file(udev_device
);
317 return udev_device
->devnode_mode
;
320 static int udev_device_set_devnode_mode(struct udev_device
*udev_device
, mode_t mode
)
324 udev_device
->devnode_mode
= mode
;
325 snprintf(num
, sizeof(num
), "%#o", mode
);
326 udev_device_add_property(udev_device
, "DEVMODE", num
);
330 uid_t
udev_device_get_devnode_uid(struct udev_device
*udev_device
)
332 if (!udev_device
->info_loaded
)
333 udev_device_read_uevent_file(udev_device
);
334 return udev_device
->devnode_uid
;
337 static int udev_device_set_devnode_uid(struct udev_device
*udev_device
, uid_t uid
)
341 udev_device
->devnode_uid
= uid
;
342 snprintf(num
, sizeof(num
), "%u", uid
);
343 udev_device_add_property(udev_device
, "DEVUID", num
);
347 gid_t
udev_device_get_devnode_gid(struct udev_device
*udev_device
)
349 if (!udev_device
->info_loaded
)
350 udev_device_read_uevent_file(udev_device
);
351 return udev_device
->devnode_gid
;
354 static int udev_device_set_devnode_gid(struct udev_device
*udev_device
, gid_t gid
)
358 udev_device
->devnode_gid
= gid
;
359 snprintf(num
, sizeof(num
), "%u", gid
);
360 udev_device_add_property(udev_device
, "DEVGID", num
);
364 struct udev_list_entry
*udev_device_add_property(struct udev_device
*udev_device
, const char *key
, const char *value
)
366 udev_device
->envp_uptodate
= false;
368 struct udev_list_entry
*list_entry
;
370 list_entry
= udev_device_get_properties_list_entry(udev_device
);
371 list_entry
= udev_list_entry_get_by_name(list_entry
, key
);
372 if (list_entry
!= NULL
)
373 udev_list_entry_delete(list_entry
);
376 return udev_list_entry_add(&udev_device
->properties_list
, key
, value
);
379 static struct udev_list_entry
*udev_device_add_property_from_string(struct udev_device
*udev_device
, const char *property
)
381 char name
[UTIL_LINE_SIZE
];
384 strscpy(name
, sizeof(name
), property
);
385 val
= strchr(name
, '=');
392 return udev_device_add_property(udev_device
, name
, val
);
396 * parse property string, and if needed, update internal values accordingly
398 * udev_device_add_property_from_string_parse_finish() needs to be
399 * called after adding properties, and its return value checked
401 * udev_device_set_info_loaded() needs to be set, to avoid trying
402 * to use a device without a DEVPATH set
404 void udev_device_add_property_from_string_parse(struct udev_device
*udev_device
, const char *property
)
406 if (startswith(property
, "DEVPATH=")) {
407 char path
[UTIL_PATH_SIZE
];
409 strscpyl(path
, sizeof(path
), "/sys", &property
[8], NULL
);
410 udev_device_set_syspath(udev_device
, path
);
411 } else if (startswith(property
, "SUBSYSTEM=")) {
412 udev_device_set_subsystem(udev_device
, &property
[10]);
413 } else if (startswith(property
, "DEVTYPE=")) {
414 udev_device_set_devtype(udev_device
, &property
[8]);
415 } else if (startswith(property
, "DEVNAME=")) {
416 udev_device_set_devnode(udev_device
, &property
[8]);
417 } else if (startswith(property
, "DEVLINKS=")) {
418 char devlinks
[UTIL_PATH_SIZE
];
422 strscpy(devlinks
, sizeof(devlinks
), &property
[9]);
424 next
= strchr(slink
, ' ');
425 while (next
!= NULL
) {
427 udev_device_add_devlink(udev_device
, slink
);
429 next
= strchr(slink
, ' ');
431 if (slink
[0] != '\0')
432 udev_device_add_devlink(udev_device
, slink
);
433 } else if (startswith(property
, "TAGS=")) {
434 char tags
[UTIL_PATH_SIZE
];
437 strscpy(tags
, sizeof(tags
), &property
[5]);
438 next
= strchr(tags
, ':');
441 while (next
[0] != '\0') {
445 next
= strchr(tag
, ':');
450 udev_device_add_tag(udev_device
, tag
);
453 } else if (startswith(property
, "USEC_INITIALIZED=")) {
454 udev_device_set_usec_initialized(udev_device
, strtoull(&property
[19], NULL
, 10));
455 } else if (startswith(property
, "DRIVER=")) {
456 udev_device_set_driver(udev_device
, &property
[7]);
457 } else if (startswith(property
, "ACTION=")) {
458 udev_device_set_action(udev_device
, &property
[7]);
459 } else if (startswith(property
, "MAJOR=")) {
460 udev_device
->maj
= strtoull(&property
[6], NULL
, 10);
461 } else if (startswith(property
, "MINOR=")) {
462 udev_device
->min
= strtoull(&property
[6], NULL
, 10);
463 } else if (startswith(property
, "DEVPATH_OLD=")) {
464 udev_device_set_devpath_old(udev_device
, &property
[12]);
465 } else if (startswith(property
, "SEQNUM=")) {
466 udev_device_set_seqnum(udev_device
, strtoull(&property
[7], NULL
, 10));
467 } else if (startswith(property
, "IFINDEX=")) {
468 udev_device_set_ifindex(udev_device
, strtoull(&property
[8], NULL
, 10));
469 } else if (startswith(property
, "DEVMODE=")) {
470 udev_device_set_devnode_mode(udev_device
, strtoul(&property
[8], NULL
, 8));
471 } else if (startswith(property
, "DEVUID=")) {
472 udev_device_set_devnode_uid(udev_device
, strtoul(&property
[7], NULL
, 10));
473 } else if (startswith(property
, "DEVGID=")) {
474 udev_device_set_devnode_gid(udev_device
, strtoul(&property
[7], NULL
, 10));
476 udev_device_add_property_from_string(udev_device
, property
);
480 int udev_device_add_property_from_string_parse_finish(struct udev_device
*udev_device
)
482 if (udev_device
->maj
> 0)
483 udev_device_set_devnum(udev_device
, makedev(udev_device
->maj
, udev_device
->min
));
484 udev_device
->maj
= 0;
485 udev_device
->min
= 0;
487 if (udev_device
->devpath
== NULL
|| udev_device
->subsystem
== NULL
)
493 * udev_device_get_property_value:
494 * @udev_device: udev device
495 * @key: property name
497 * Get the value of a given property.
499 * Returns: the property string, or #NULL if there is no such property.
501 _public_
const char *udev_device_get_property_value(struct udev_device
*udev_device
, const char *key
)
503 struct udev_list_entry
*list_entry
;
505 if (udev_device
== NULL
)
510 list_entry
= udev_device_get_properties_list_entry(udev_device
);
511 list_entry
= udev_list_entry_get_by_name(list_entry
, key
);
512 return udev_list_entry_get_value(list_entry
);
515 int udev_device_read_db(struct udev_device
*udev_device
, const char *dbfile
)
517 char filename
[UTIL_PATH_SIZE
];
518 char line
[UTIL_LINE_SIZE
];
521 /* providing a database file will always force-load it */
522 if (dbfile
== NULL
) {
525 if (udev_device
->db_loaded
)
527 udev_device
->db_loaded
= true;
529 id
= udev_device_get_id_filename(udev_device
);
532 strscpyl(filename
, sizeof(filename
), "/run/udev/data/", id
, NULL
);
536 f
= fopen(dbfile
, "re");
538 return log_debug_errno(errno
, "no db file to read %s: %m", dbfile
);
540 /* devices with a database entry are initialized */
541 udev_device
->is_initialized
= true;
543 while (fgets(line
, sizeof(line
), f
)) {
546 struct udev_list_entry
*entry
;
555 strscpyl(filename
, sizeof(filename
), "/dev/", val
, NULL
);
556 udev_device_add_devlink(udev_device
, filename
);
559 udev_device_set_devlink_priority(udev_device
, atoi(val
));
562 entry
= udev_device_add_property_from_string(udev_device
, val
);
563 udev_list_entry_set_num(entry
, true);
566 udev_device_add_tag(udev_device
, val
);
569 udev_device_set_watch_handle(udev_device
, atoi(val
));
572 udev_device_set_usec_initialized(udev_device
, strtoull(val
, NULL
, 10));
578 log_debug("device %p filled with db file data", udev_device
);
582 int udev_device_read_uevent_file(struct udev_device
*udev_device
)
584 char filename
[UTIL_PATH_SIZE
];
586 char line
[UTIL_LINE_SIZE
];
590 if (udev_device
->uevent_loaded
)
593 strscpyl(filename
, sizeof(filename
), udev_device
->syspath
, "/uevent", NULL
);
594 f
= fopen(filename
, "re");
597 udev_device
->uevent_loaded
= true;
599 while (fgets(line
, sizeof(line
), f
)) {
602 pos
= strchr(line
, '\n');
607 if (startswith(line
, "DEVTYPE=")) {
608 udev_device_set_devtype(udev_device
, &line
[8]);
611 if (startswith(line
, "IFINDEX=")) {
612 udev_device_set_ifindex(udev_device
, strtoull(&line
[8], NULL
, 10));
615 if (startswith(line
, "DEVNAME=")) {
616 udev_device_set_devnode(udev_device
, &line
[8]);
620 if (startswith(line
, "MAJOR="))
621 maj
= strtoull(&line
[6], NULL
, 10);
622 else if (startswith(line
, "MINOR="))
623 min
= strtoull(&line
[6], NULL
, 10);
624 else if (startswith(line
, "DEVMODE="))
625 udev_device
->devnode_mode
= strtoul(&line
[8], NULL
, 8);
627 udev_device_add_property_from_string(udev_device
, line
);
630 udev_device
->devnum
= makedev(maj
, min
);
635 void udev_device_set_info_loaded(struct udev_device
*device
)
637 device
->info_loaded
= true;
640 struct udev_device
*udev_device_new(struct udev
*udev
)
642 struct udev_device
*udev_device
;
649 udev_device
= new0(struct udev_device
, 1);
650 if (udev_device
== NULL
) {
654 udev_device
->refcount
= 1;
655 udev_device
->udev
= udev
;
656 udev_list_init(udev
, &udev_device
->devlinks_list
, true);
657 udev_list_init(udev
, &udev_device
->properties_list
, true);
658 udev_list_init(udev
, &udev_device
->sysattr_value_list
, true);
659 udev_list_init(udev
, &udev_device
->sysattr_list
, false);
660 udev_list_init(udev
, &udev_device
->tags_list
, true);
661 udev_device
->watch_handle
= -1;
667 * udev_device_new_from_syspath:
668 * @udev: udev library context
669 * @syspath: sys device path including sys directory
671 * Create new udev device, and fill in information from the sys
672 * device and the udev database entry. The syspath is the absolute
673 * path to the device, including the sys mount point.
675 * The initial refcount is 1, and needs to be decremented to
676 * release the resources of the udev device.
678 * Returns: a new udev device, or #NULL, if it does not exist
680 _public_
struct udev_device
*udev_device_new_from_syspath(struct udev
*udev
, const char *syspath
)
683 char path
[UTIL_PATH_SIZE
];
686 struct udev_device
*udev_device
;
693 if (syspath
== NULL
) {
698 /* path starts in sys */
699 if (!startswith(syspath
, "/sys")) {
700 log_debug("not in sys :%s", syspath
);
705 /* path is not a root directory */
706 subdir
= syspath
+ strlen("/sys");
707 pos
= strrchr(subdir
, '/');
708 if (pos
== NULL
|| pos
[1] == '\0' || pos
< &subdir
[2]) {
713 /* resolve possible symlink to real path */
714 strscpy(path
, sizeof(path
), syspath
);
715 util_resolve_sys_link(udev
, path
, sizeof(path
));
717 if (startswith(path
+ strlen("/sys"), "/devices/")) {
718 char file
[UTIL_PATH_SIZE
];
720 /* all "devices" require a "uevent" file */
721 strscpyl(file
, sizeof(file
), path
, "/uevent", NULL
);
722 if (stat(file
, &statbuf
) != 0)
725 /* everything else just needs to be a directory */
726 if (stat(path
, &statbuf
) != 0 || !S_ISDIR(statbuf
.st_mode
))
730 udev_device
= udev_device_new(udev
);
731 if (udev_device
== NULL
)
734 udev_device_set_syspath(udev_device
, path
);
735 log_debug("device %p has devpath '%s'", udev_device
, udev_device_get_devpath(udev_device
));
741 * udev_device_new_from_devnum:
742 * @udev: udev library context
743 * @type: char or block device
744 * @devnum: device major/minor number
746 * Create new udev device, and fill in information from the sys
747 * device and the udev database entry. The device is looked-up
748 * by its major/minor number and type. Character and block device
749 * numbers are not unique across the two types.
751 * The initial refcount is 1, and needs to be decremented to
752 * release the resources of the udev device.
754 * Returns: a new udev device, or #NULL, if it does not exist
756 _public_
struct udev_device
*udev_device_new_from_devnum(struct udev
*udev
, char type
, dev_t devnum
)
758 char path
[UTIL_PATH_SIZE
];
759 const char *type_str
;
763 else if (type
== 'c')
770 /* use /sys/dev/{block,char}/<maj>:<min> link */
771 snprintf(path
, sizeof(path
), "/sys/dev/%s/%u:%u",
772 type_str
, major(devnum
), minor(devnum
));
773 return udev_device_new_from_syspath(udev
, path
);
777 * udev_device_new_from_device_id:
778 * @udev: udev library context
779 * @id: text string identifying a kernel device
781 * Create new udev device, and fill in information from the sys
782 * device and the udev database entry. The device is looked-up
783 * by a special string:
784 * b8:2 - block device major:minor
785 * c128:1 - char device major:minor
786 * n3 - network device ifindex
787 * +sound:card29 - kernel driver core subsystem:device name
789 * The initial refcount is 1, and needs to be decremented to
790 * release the resources of the udev device.
792 * Returns: a new udev device, or #NULL, if it does not exist
794 _public_
struct udev_device
*udev_device_new_from_device_id(struct udev
*udev
, const char *id
)
798 char subsys
[UTIL_PATH_SIZE
];
804 if (sscanf(id
, "%c%i:%i", &type
, &maj
, &min
) != 3)
806 return udev_device_new_from_devnum(udev
, type
, makedev(maj
, min
));
810 struct udev_device
*dev
;
813 ifindex
= strtoul(&id
[1], NULL
, 10);
819 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
822 memzero(&ifr
, sizeof(struct ifreq
));
823 ifr
.ifr_ifindex
= ifindex
;
824 if (ioctl(sk
, SIOCGIFNAME
, &ifr
) != 0) {
830 dev
= udev_device_new_from_subsystem_sysname(udev
, "net", ifr
.ifr_name
);
833 if (udev_device_get_ifindex(dev
) == ifindex
)
836 /* this is racy, so we may end up with the wrong device */
837 udev_device_unref(dev
);
842 strscpy(subsys
, sizeof(subsys
), &id
[1]);
843 sysname
= strchr(subsys
, ':');
844 if (sysname
== NULL
) {
849 sysname
= &sysname
[1];
850 return udev_device_new_from_subsystem_sysname(udev
, subsys
, sysname
);
858 * udev_device_new_from_subsystem_sysname:
859 * @udev: udev library context
860 * @subsystem: the subsystem of the device
861 * @sysname: the name of the device
863 * Create new udev device, and fill in information from the sys device
864 * and the udev database entry. The device is looked up by the subsystem
865 * and name string of the device, like "mem" / "zero", or "block" / "sda".
867 * The initial refcount is 1, and needs to be decremented to
868 * release the resources of the udev device.
870 * Returns: a new udev device, or #NULL, if it does not exist
872 _public_
struct udev_device
*udev_device_new_from_subsystem_sysname(struct udev
*udev
, const char *subsystem
, const char *sysname
)
874 char path
[UTIL_PATH_SIZE
];
877 if (streq(subsystem
, "subsystem")) {
878 strscpyl(path
, sizeof(path
), "/sys/subsystem/", sysname
, NULL
);
879 if (stat(path
, &statbuf
) == 0)
882 strscpyl(path
, sizeof(path
), "/sys/bus/", sysname
, NULL
);
883 if (stat(path
, &statbuf
) == 0)
886 strscpyl(path
, sizeof(path
), "/sys/class/", sysname
, NULL
);
887 if (stat(path
, &statbuf
) == 0)
892 if (streq(subsystem
, "module")) {
893 strscpyl(path
, sizeof(path
), "/sys/module/", sysname
, NULL
);
894 if (stat(path
, &statbuf
) == 0)
899 if (streq(subsystem
, "drivers")) {
900 char subsys
[UTIL_NAME_SIZE
];
903 strscpy(subsys
, sizeof(subsys
), sysname
);
904 driver
= strchr(subsys
, ':');
905 if (driver
!= NULL
) {
909 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsys
, "/drivers/", driver
, NULL
);
910 if (stat(path
, &statbuf
) == 0)
913 strscpyl(path
, sizeof(path
), "/sys/bus/", subsys
, "/drivers/", driver
, NULL
);
914 if (stat(path
, &statbuf
) == 0)
922 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsystem
, "/devices/", sysname
, NULL
);
923 if (stat(path
, &statbuf
) == 0)
926 strscpyl(path
, sizeof(path
), "/sys/bus/", subsystem
, "/devices/", sysname
, NULL
);
927 if (stat(path
, &statbuf
) == 0)
930 strscpyl(path
, sizeof(path
), "/sys/class/", subsystem
, "/", sysname
, NULL
);
931 if (stat(path
, &statbuf
) == 0)
936 return udev_device_new_from_syspath(udev
, path
);
940 * udev_device_new_from_environment
941 * @udev: udev library context
943 * Create new udev device, and fill in information from the
944 * current process environment. This only works reliable if
945 * the process is called from a udev rule. It is usually used
946 * for tools executed from IMPORT= rules.
948 * The initial refcount is 1, and needs to be decremented to
949 * release the resources of the udev device.
951 * Returns: a new udev device, or #NULL, if it does not exist
953 _public_
struct udev_device
*udev_device_new_from_environment(struct udev
*udev
)
956 struct udev_device
*udev_device
;
958 udev_device
= udev_device_new(udev
);
959 if (udev_device
== NULL
)
961 udev_device_set_info_loaded(udev_device
);
963 for (i
= 0; environ
[i
] != NULL
; i
++)
964 udev_device_add_property_from_string_parse(udev_device
, environ
[i
]);
966 if (udev_device_add_property_from_string_parse_finish(udev_device
) < 0) {
967 log_debug("missing values, invalid device");
968 udev_device_unref(udev_device
);
975 static struct udev_device
*device_new_from_parent(struct udev_device
*udev_device
)
977 struct udev_device
*udev_device_parent
= NULL
;
978 char path
[UTIL_PATH_SIZE
];
981 strscpy(path
, sizeof(path
), udev_device
->syspath
);
982 subdir
= path
+ strlen("/sys/");
986 pos
= strrchr(subdir
, '/');
987 if (pos
== NULL
|| pos
< &subdir
[2])
990 udev_device_parent
= udev_device_new_from_syspath(udev_device
->udev
, path
);
991 if (udev_device_parent
!= NULL
)
992 return udev_device_parent
;
1000 * udev_device_get_parent:
1001 * @udev_device: the device to start searching from
1003 * Find the next parent device, and fill in information from the sys
1004 * device and the udev database entry.
1006 * Returned device is not referenced. It is attached to the child
1007 * device, and will be cleaned up when the child device is cleaned up.
1009 * It is not necessarily just the upper level directory, empty or not
1010 * recognized sys directories are ignored.
1012 * It can be called as many times as needed, without caring about
1015 * Returns: a new udev device, or #NULL, if it no parent exist.
1017 _public_
struct udev_device
*udev_device_get_parent(struct udev_device
*udev_device
)
1019 if (udev_device
== NULL
) {
1023 if (!udev_device
->parent_set
) {
1024 udev_device
->parent_set
= true;
1025 udev_device
->parent_device
= device_new_from_parent(udev_device
);
1027 return udev_device
->parent_device
;
1031 * udev_device_get_parent_with_subsystem_devtype:
1032 * @udev_device: udev device to start searching from
1033 * @subsystem: the subsystem of the device
1034 * @devtype: the type (DEVTYPE) of the device
1036 * Find the next parent device, with a matching subsystem and devtype
1037 * value, and fill in information from the sys device and the udev
1040 * If devtype is #NULL, only subsystem is checked, and any devtype will
1043 * Returned device is not referenced. It is attached to the child
1044 * device, and will be cleaned up when the child device is cleaned up.
1046 * It can be called as many times as needed, without caring about
1049 * Returns: a new udev device, or #NULL if no matching parent exists.
1051 _public_
struct udev_device
*udev_device_get_parent_with_subsystem_devtype(struct udev_device
*udev_device
, const char *subsystem
, const char *devtype
)
1053 struct udev_device
*parent
;
1055 if (subsystem
== NULL
) {
1060 parent
= udev_device_get_parent(udev_device
);
1061 while (parent
!= NULL
) {
1062 const char *parent_subsystem
;
1063 const char *parent_devtype
;
1065 parent_subsystem
= udev_device_get_subsystem(parent
);
1066 if (parent_subsystem
!= NULL
&& streq(parent_subsystem
, subsystem
)) {
1067 if (devtype
== NULL
)
1069 parent_devtype
= udev_device_get_devtype(parent
);
1070 if (parent_devtype
!= NULL
&& streq(parent_devtype
, devtype
))
1073 parent
= udev_device_get_parent(parent
);
1083 * udev_device_get_udev:
1084 * @udev_device: udev device
1086 * Retrieve the udev library context the device was created with.
1088 * Returns: the udev library context
1090 _public_
struct udev
*udev_device_get_udev(struct udev_device
*udev_device
)
1092 if (udev_device
== NULL
)
1094 return udev_device
->udev
;
1099 * @udev_device: udev device
1101 * Take a reference of a udev device.
1103 * Returns: the passed udev device
1105 _public_
struct udev_device
*udev_device_ref(struct udev_device
*udev_device
)
1107 if (udev_device
== NULL
)
1109 udev_device
->refcount
++;
1114 * udev_device_unref:
1115 * @udev_device: udev device
1117 * Drop a reference of a udev device. If the refcount reaches zero,
1118 * the resources of the device will be released.
1122 _public_
struct udev_device
*udev_device_unref(struct udev_device
*udev_device
)
1124 if (udev_device
== NULL
)
1126 udev_device
->refcount
--;
1127 if (udev_device
->refcount
> 0)
1129 if (udev_device
->parent_device
!= NULL
)
1130 udev_device_unref(udev_device
->parent_device
);
1131 free(udev_device
->syspath
);
1132 free(udev_device
->sysname
);
1133 free(udev_device
->devnode
);
1134 free(udev_device
->subsystem
);
1135 free(udev_device
->devtype
);
1136 udev_list_cleanup(&udev_device
->devlinks_list
);
1137 udev_list_cleanup(&udev_device
->properties_list
);
1138 udev_list_cleanup(&udev_device
->sysattr_value_list
);
1139 udev_list_cleanup(&udev_device
->sysattr_list
);
1140 udev_list_cleanup(&udev_device
->tags_list
);
1141 free(udev_device
->action
);
1142 free(udev_device
->driver
);
1143 free(udev_device
->devpath_old
);
1144 free(udev_device
->id_filename
);
1145 free(udev_device
->envp
);
1146 free(udev_device
->monitor_buf
);
1152 * udev_device_get_devpath:
1153 * @udev_device: udev device
1155 * Retrieve the kernel devpath value of the udev device. The path
1156 * does not contain the sys mount point, and starts with a '/'.
1158 * Returns: the devpath of the udev device
1160 _public_
const char *udev_device_get_devpath(struct udev_device
*udev_device
)
1162 if (udev_device
== NULL
)
1164 return udev_device
->devpath
;
1168 * udev_device_get_syspath:
1169 * @udev_device: udev device
1171 * Retrieve the sys path of the udev device. The path is an
1172 * absolute path and starts with the sys mount point.
1174 * Returns: the sys path of the udev device
1176 _public_
const char *udev_device_get_syspath(struct udev_device
*udev_device
)
1178 if (udev_device
== NULL
)
1180 return udev_device
->syspath
;
1184 * udev_device_get_sysname:
1185 * @udev_device: udev device
1187 * Get the kernel device name in /sys.
1189 * Returns: the name string of the device device
1191 _public_
const char *udev_device_get_sysname(struct udev_device
*udev_device
)
1193 if (udev_device
== NULL
)
1195 return udev_device
->sysname
;
1199 * udev_device_get_sysnum:
1200 * @udev_device: udev device
1202 * Get the instance number of the device.
1204 * Returns: the trailing number string of the device name
1206 _public_
const char *udev_device_get_sysnum(struct udev_device
*udev_device
)
1208 if (udev_device
== NULL
)
1210 return udev_device
->sysnum
;
1214 * udev_device_get_devnode:
1215 * @udev_device: udev device
1217 * Retrieve the device node file name belonging to the udev device.
1218 * The path is an absolute path, and starts with the device directory.
1220 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1222 _public_
const char *udev_device_get_devnode(struct udev_device
*udev_device
)
1224 if (udev_device
== NULL
)
1226 if (udev_device
->devnode
!= NULL
)
1227 return udev_device
->devnode
;
1228 if (!udev_device
->info_loaded
)
1229 udev_device_read_uevent_file(udev_device
);
1230 return udev_device
->devnode
;
1234 * udev_device_get_devlinks_list_entry:
1235 * @udev_device: udev device
1237 * Retrieve the list of device links pointing to the device file of
1238 * the udev device. The next list entry can be retrieved with
1239 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1240 * The devlink path can be retrieved from the list entry by
1241 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1242 * the device directory.
1244 * Returns: the first entry of the device node link list
1246 _public_
struct udev_list_entry
*udev_device_get_devlinks_list_entry(struct udev_device
*udev_device
)
1248 if (udev_device
== NULL
)
1250 if (!udev_device
->info_loaded
)
1251 udev_device_read_db(udev_device
, NULL
);
1252 return udev_list_get_entry(&udev_device
->devlinks_list
);
1255 void udev_device_cleanup_devlinks_list(struct udev_device
*udev_device
)
1257 udev_device
->devlinks_uptodate
= false;
1258 udev_list_cleanup(&udev_device
->devlinks_list
);
1262 * udev_device_get_properties_list_entry:
1263 * @udev_device: udev device
1265 * Retrieve the list of key/value device properties of the udev
1266 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1267 * which returns #NULL if no more entries exist. The property name
1268 * can be retrieved from the list entry by udev_list_entry_get_name(),
1269 * the property value by udev_list_entry_get_value().
1271 * Returns: the first entry of the property list
1273 _public_
struct udev_list_entry
*udev_device_get_properties_list_entry(struct udev_device
*udev_device
)
1275 if (udev_device
== NULL
)
1277 if (!udev_device
->info_loaded
) {
1278 udev_device_read_uevent_file(udev_device
);
1279 udev_device_read_db(udev_device
, NULL
);
1281 if (!udev_device
->devlinks_uptodate
) {
1282 char symlinks
[UTIL_PATH_SIZE
];
1283 struct udev_list_entry
*list_entry
;
1285 udev_device
->devlinks_uptodate
= true;
1286 list_entry
= udev_device_get_devlinks_list_entry(udev_device
);
1287 if (list_entry
!= NULL
) {
1292 l
= strpcpyl(&s
, sizeof(symlinks
), udev_list_entry_get_name(list_entry
), NULL
);
1293 udev_list_entry_foreach(list_entry
, udev_list_entry_get_next(list_entry
))
1294 l
= strpcpyl(&s
, l
, " ", udev_list_entry_get_name(list_entry
), NULL
);
1295 udev_device_add_property(udev_device
, "DEVLINKS", symlinks
);
1298 if (!udev_device
->tags_uptodate
) {
1299 udev_device
->tags_uptodate
= true;
1300 if (udev_device_get_tags_list_entry(udev_device
) != NULL
) {
1301 char tags
[UTIL_PATH_SIZE
];
1302 struct udev_list_entry
*list_entry
;
1307 l
= strpcpyl(&s
, sizeof(tags
), ":", NULL
);
1308 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(udev_device
))
1309 l
= strpcpyl(&s
, l
, udev_list_entry_get_name(list_entry
), ":", NULL
);
1310 udev_device_add_property(udev_device
, "TAGS", tags
);
1313 return udev_list_get_entry(&udev_device
->properties_list
);
1317 * udev_device_get_action:
1318 * @udev_device: udev device
1320 * This is only valid if the device was received through a monitor. Devices read from
1321 * sys do not have an action string. Usual actions are: add, remove, change, online,
1324 * Returns: the kernel action value, or #NULL if there is no action value available.
1326 _public_
const char *udev_device_get_action(struct udev_device
*udev_device
)
1328 if (udev_device
== NULL
)
1330 return udev_device
->action
;
1334 * udev_device_get_usec_since_initialized:
1335 * @udev_device: udev device
1337 * Return the number of microseconds passed since udev set up the
1338 * device for the first time.
1340 * This is only implemented for devices with need to store properties
1341 * in the udev database. All other devices return 0 here.
1343 * Returns: the number of microseconds since the device was first seen.
1345 _public_
unsigned long long int udev_device_get_usec_since_initialized(struct udev_device
*udev_device
)
1349 if (udev_device
== NULL
)
1351 if (!udev_device
->info_loaded
)
1352 udev_device_read_db(udev_device
, NULL
);
1353 if (udev_device
->usec_initialized
== 0)
1355 now_ts
= now(CLOCK_MONOTONIC
);
1358 return now_ts
- udev_device
->usec_initialized
;
1361 usec_t
udev_device_get_usec_initialized(struct udev_device
*udev_device
)
1363 return udev_device
->usec_initialized
;
1366 void udev_device_set_usec_initialized(struct udev_device
*udev_device
, usec_t usec_initialized
)
1370 udev_device
->usec_initialized
= usec_initialized
;
1371 snprintf(num
, sizeof(num
), USEC_FMT
, usec_initialized
);
1372 udev_device_add_property(udev_device
, "USEC_INITIALIZED", num
);
1376 * udev_device_get_sysattr_value:
1377 * @udev_device: udev device
1378 * @sysattr: attribute name
1380 * The retrieved value is cached in the device. Repeated calls will return the same
1381 * value and not open the attribute again.
1383 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1385 _public_
const char *udev_device_get_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
)
1387 struct udev_list_entry
*list_entry
;
1388 char path
[UTIL_PATH_SIZE
];
1390 struct stat statbuf
;
1393 const char *val
= NULL
;
1395 if (udev_device
== NULL
)
1397 if (sysattr
== NULL
)
1400 /* look for possibly already cached result */
1401 list_entry
= udev_list_get_entry(&udev_device
->sysattr_value_list
);
1402 list_entry
= udev_list_entry_get_by_name(list_entry
, sysattr
);
1403 if (list_entry
!= NULL
)
1404 return udev_list_entry_get_value(list_entry
);
1406 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", sysattr
, NULL
);
1407 if (lstat(path
, &statbuf
) != 0) {
1408 udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, NULL
);
1412 if (S_ISLNK(statbuf
.st_mode
)) {
1414 * Some core links return only the last element of the target path,
1415 * these are just values, the paths should not be exposed.
1417 if (streq(sysattr
, "driver") ||
1418 streq(sysattr
, "subsystem") ||
1419 streq(sysattr
, "module")) {
1420 if (util_get_sys_core_link_value(udev_device
->udev
, sysattr
,
1421 udev_device
->syspath
, value
, sizeof(value
)) < 0)
1423 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1424 val
= udev_list_entry_get_value(list_entry
);
1431 /* skip directories */
1432 if (S_ISDIR(statbuf
.st_mode
))
1435 /* skip non-readable files */
1436 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1439 /* read attribute value */
1440 fd
= open(path
, O_RDONLY
|O_CLOEXEC
);
1443 size
= read(fd
, value
, sizeof(value
));
1447 if (size
== sizeof(value
))
1450 /* got a valid value, store it in cache and return it */
1452 util_remove_trailing_chars(value
, '\n');
1453 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1454 val
= udev_list_entry_get_value(list_entry
);
1460 * udev_device_set_sysattr_value:
1461 * @udev_device: udev device
1462 * @sysattr: attribute name
1463 * @value: new value to be set
1465 * Update the contents of the sys attribute and the cached value of the device.
1467 * Returns: Negative error code on failure or 0 on success.
1469 _public_
int udev_device_set_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
, char *value
)
1471 struct udev_device
*dev
;
1472 char path
[UTIL_PATH_SIZE
];
1473 struct stat statbuf
;
1475 ssize_t size
, value_len
;
1478 if (udev_device
== NULL
)
1481 if (sysattr
== NULL
)
1486 value_len
= strlen(value
);
1488 strscpyl(path
, sizeof(path
), udev_device_get_syspath(dev
), "/", sysattr
, NULL
);
1489 if (lstat(path
, &statbuf
) != 0) {
1490 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, NULL
);
1495 if (S_ISLNK(statbuf
.st_mode
)) {
1500 /* skip directories */
1501 if (S_ISDIR(statbuf
.st_mode
)) {
1506 /* skip non-readable files */
1507 if ((statbuf
.st_mode
& S_IRUSR
) == 0) {
1512 /* Value is limited to 4k */
1513 if (value_len
> 4096) {
1517 util_remove_trailing_chars(value
, '\n');
1519 /* write attribute value */
1520 fd
= open(path
, O_WRONLY
|O_CLOEXEC
);
1525 size
= write(fd
, value
, value_len
);
1531 if (size
< value_len
) {
1536 /* wrote a valid value, store it in cache and return it */
1537 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, value
);
1539 if (dev
!= udev_device
)
1540 udev_device_unref(dev
);
1544 static int udev_device_sysattr_list_read(struct udev_device
*udev_device
)
1546 struct dirent
*dent
;
1550 if (udev_device
== NULL
)
1552 if (udev_device
->sysattr_list_read
)
1555 dir
= opendir(udev_device_get_syspath(udev_device
));
1559 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
1560 char path
[UTIL_PATH_SIZE
];
1561 struct stat statbuf
;
1563 /* only handle symlinks and regular files */
1564 if (dent
->d_type
!= DT_LNK
&& dent
->d_type
!= DT_REG
)
1567 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", dent
->d_name
, NULL
);
1568 if (lstat(path
, &statbuf
) != 0)
1570 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1573 udev_list_entry_add(&udev_device
->sysattr_list
, dent
->d_name
, NULL
);
1578 udev_device
->sysattr_list_read
= true;
1584 * udev_device_get_sysattr_list_entry:
1585 * @udev_device: udev device
1587 * Retrieve the list of available sysattrs, with value being empty;
1588 * This just return all available sysfs attributes for a particular
1589 * device without reading their values.
1591 * Returns: the first entry of the property list
1593 _public_
struct udev_list_entry
*udev_device_get_sysattr_list_entry(struct udev_device
*udev_device
)
1595 if (!udev_device
->sysattr_list_read
) {
1597 ret
= udev_device_sysattr_list_read(udev_device
);
1602 return udev_list_get_entry(&udev_device
->sysattr_list
);
1605 int udev_device_set_syspath(struct udev_device
*udev_device
, const char *syspath
)
1610 free(udev_device
->syspath
);
1611 udev_device
->syspath
= strdup(syspath
);
1612 if (udev_device
->syspath
== NULL
)
1614 udev_device
->devpath
= udev_device
->syspath
+ strlen("/sys");
1615 udev_device_add_property(udev_device
, "DEVPATH", udev_device
->devpath
);
1617 pos
= strrchr(udev_device
->syspath
, '/');
1620 udev_device
->sysname
= strdup(&pos
[1]);
1621 if (udev_device
->sysname
== NULL
)
1624 /* some devices have '!' in their name, change that to '/' */
1626 while (udev_device
->sysname
[len
] != '\0') {
1627 if (udev_device
->sysname
[len
] == '!')
1628 udev_device
->sysname
[len
] = '/';
1632 /* trailing number */
1633 while (len
> 0 && isdigit(udev_device
->sysname
[--len
]))
1634 udev_device
->sysnum
= &udev_device
->sysname
[len
];
1636 /* sysname is completely numeric */
1638 udev_device
->sysnum
= NULL
;
1643 static int udev_device_set_devnode(struct udev_device
*udev_device
, const char *devnode
)
1645 free(udev_device
->devnode
);
1646 if (devnode
[0] != '/') {
1647 if (asprintf(&udev_device
->devnode
, "/dev/%s", devnode
) < 0)
1648 udev_device
->devnode
= NULL
;
1650 udev_device
->devnode
= strdup(devnode
);
1652 if (udev_device
->devnode
== NULL
)
1654 udev_device_add_property(udev_device
, "DEVNAME", udev_device
->devnode
);
1658 int udev_device_add_devlink(struct udev_device
*udev_device
, const char *devlink
)
1660 struct udev_list_entry
*list_entry
;
1662 udev_device
->devlinks_uptodate
= false;
1663 list_entry
= udev_list_entry_add(&udev_device
->devlinks_list
, devlink
, NULL
);
1664 if (list_entry
== NULL
)
1669 const char *udev_device_get_id_filename(struct udev_device
*udev_device
)
1671 if (udev_device
->id_filename
== NULL
) {
1672 if (udev_device_get_subsystem(udev_device
) == NULL
)
1675 if (major(udev_device_get_devnum(udev_device
)) > 0) {
1676 /* use dev_t -- b259:131072, c254:0 */
1677 if (asprintf(&udev_device
->id_filename
, "%c%u:%u",
1678 streq(udev_device_get_subsystem(udev_device
), "block") ? 'b' : 'c',
1679 major(udev_device_get_devnum(udev_device
)),
1680 minor(udev_device_get_devnum(udev_device
))) < 0)
1681 udev_device
->id_filename
= NULL
;
1682 } else if (udev_device_get_ifindex(udev_device
) > 0) {
1683 /* use netdev ifindex -- n3 */
1684 if (asprintf(&udev_device
->id_filename
, "n%u", udev_device_get_ifindex(udev_device
)) < 0)
1685 udev_device
->id_filename
= NULL
;
1688 * use $subsys:$syname -- pci:0000:00:1f.2
1689 * sysname() has '!' translated, get it from devpath
1691 const char *sysname
;
1692 sysname
= strrchr(udev_device
->devpath
, '/');
1693 if (sysname
== NULL
)
1695 sysname
= &sysname
[1];
1696 if (asprintf(&udev_device
->id_filename
, "+%s:%s", udev_device_get_subsystem(udev_device
), sysname
) < 0)
1697 udev_device
->id_filename
= NULL
;
1700 return udev_device
->id_filename
;
1704 * udev_device_get_is_initialized:
1705 * @udev_device: udev device
1707 * Check if udev has already handled the device and has set up
1708 * device node permissions and context, or has renamed a network
1711 * This is only implemented for devices with a device node
1712 * or network interfaces. All other devices return 1 here.
1714 * Returns: 1 if the device is set up. 0 otherwise.
1716 _public_
int udev_device_get_is_initialized(struct udev_device
*udev_device
)
1718 if (!udev_device
->info_loaded
)
1719 udev_device_read_db(udev_device
, NULL
);
1720 return udev_device
->is_initialized
;
1723 void udev_device_set_is_initialized(struct udev_device
*udev_device
)
1725 udev_device
->is_initialized
= true;
1728 static bool is_valid_tag(const char *tag
)
1730 return !strchr(tag
, ':') && !strchr(tag
, ' ');
1733 int udev_device_add_tag(struct udev_device
*udev_device
, const char *tag
)
1735 if (!is_valid_tag(tag
))
1737 udev_device
->tags_uptodate
= false;
1738 if (udev_list_entry_add(&udev_device
->tags_list
, tag
, NULL
) != NULL
)
1743 void udev_device_remove_tag(struct udev_device
*udev_device
, const char *tag
)
1745 struct udev_list_entry
*e
;
1747 if (!is_valid_tag(tag
))
1749 e
= udev_list_get_entry(&udev_device
->tags_list
);
1750 e
= udev_list_entry_get_by_name(e
, tag
);
1752 udev_device
->tags_uptodate
= false;
1753 udev_list_entry_delete(e
);
1757 void udev_device_cleanup_tags_list(struct udev_device
*udev_device
)
1759 udev_device
->tags_uptodate
= false;
1760 udev_list_cleanup(&udev_device
->tags_list
);
1764 * udev_device_get_tags_list_entry:
1765 * @udev_device: udev device
1767 * Retrieve the list of tags attached to the udev device. The next
1768 * list entry can be retrieved with udev_list_entry_get_next(),
1769 * which returns #NULL if no more entries exist. The tag string
1770 * can be retrieved from the list entry by udev_list_entry_get_name().
1772 * Returns: the first entry of the tag list
1774 _public_
struct udev_list_entry
*udev_device_get_tags_list_entry(struct udev_device
*udev_device
)
1776 if (udev_device
== NULL
)
1778 if (!udev_device
->info_loaded
)
1779 udev_device_read_db(udev_device
, NULL
);
1780 return udev_list_get_entry(&udev_device
->tags_list
);
1784 * udev_device_has_tag:
1785 * @udev_device: udev device
1788 * Check if a given device has a certain tag associated.
1790 * Returns: 1 if the tag is found. 0 otherwise.
1792 _public_
int udev_device_has_tag(struct udev_device
*udev_device
, const char *tag
)
1794 struct udev_list_entry
*list_entry
;
1796 if (udev_device
== NULL
)
1798 if (!udev_device
->info_loaded
)
1799 udev_device_read_db(udev_device
, NULL
);
1800 list_entry
= udev_device_get_tags_list_entry(udev_device
);
1801 if (udev_list_entry_get_by_name(list_entry
, tag
) != NULL
)
1806 #define ENVP_SIZE 128
1807 #define MONITOR_BUF_SIZE 4096
1808 static int update_envp_monitor_buf(struct udev_device
*udev_device
)
1810 struct udev_list_entry
*list_entry
;
1815 /* monitor buffer of property strings */
1816 free(udev_device
->monitor_buf
);
1817 udev_device
->monitor_buf_len
= 0;
1818 udev_device
->monitor_buf
= malloc(MONITOR_BUF_SIZE
);
1819 if (udev_device
->monitor_buf
== NULL
)
1822 /* envp array, strings will point into monitor buffer */
1823 if (udev_device
->envp
== NULL
)
1824 udev_device
->envp
= malloc(sizeof(char *) * ENVP_SIZE
);
1825 if (udev_device
->envp
== NULL
)
1829 s
= udev_device
->monitor_buf
;
1830 l
= MONITOR_BUF_SIZE
;
1831 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(udev_device
)) {
1834 key
= udev_list_entry_get_name(list_entry
);
1835 /* skip private variables */
1839 /* add string to envp array */
1840 udev_device
->envp
[i
++] = s
;
1841 if (i
+1 >= ENVP_SIZE
)
1844 /* add property string to monitor buffer */
1845 l
= strpcpyl(&s
, l
, key
, "=", udev_list_entry_get_value(list_entry
), NULL
);
1848 /* advance past the trailing '\0' that strpcpyl() guarantees */
1852 udev_device
->envp
[i
] = NULL
;
1853 udev_device
->monitor_buf_len
= s
- udev_device
->monitor_buf
;
1854 udev_device
->envp_uptodate
= true;
1858 char **udev_device_get_properties_envp(struct udev_device
*udev_device
)
1860 if (!udev_device
->envp_uptodate
)
1861 if (update_envp_monitor_buf(udev_device
) != 0)
1863 return udev_device
->envp
;
1866 ssize_t
udev_device_get_properties_monitor_buf(struct udev_device
*udev_device
, const char **buf
)
1868 if (!udev_device
->envp_uptodate
)
1869 if (update_envp_monitor_buf(udev_device
) != 0)
1871 *buf
= udev_device
->monitor_buf
;
1872 return udev_device
->monitor_buf_len
;
1875 int udev_device_set_action(struct udev_device
*udev_device
, const char *action
)
1877 free(udev_device
->action
);
1878 udev_device
->action
= strdup(action
);
1879 if (udev_device
->action
== NULL
)
1881 udev_device_add_property(udev_device
, "ACTION", udev_device
->action
);
1885 int udev_device_get_devlink_priority(struct udev_device
*udev_device
)
1887 if (!udev_device
->info_loaded
)
1888 udev_device_read_db(udev_device
, NULL
);
1889 return udev_device
->devlink_priority
;
1892 int udev_device_set_devlink_priority(struct udev_device
*udev_device
, int prio
)
1894 udev_device
->devlink_priority
= prio
;
1898 int udev_device_get_watch_handle(struct udev_device
*udev_device
)
1900 if (!udev_device
->info_loaded
)
1901 udev_device_read_db(udev_device
, NULL
);
1902 return udev_device
->watch_handle
;
1905 int udev_device_set_watch_handle(struct udev_device
*udev_device
, int handle
)
1907 udev_device
->watch_handle
= handle
;
1911 bool udev_device_get_db_persist(struct udev_device
*udev_device
)
1913 return udev_device
->db_persist
;
1916 void udev_device_set_db_persist(struct udev_device
*udev_device
)
1918 udev_device
->db_persist
= true;