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 log_debug_errno(errno
, "no db file to read %s: %m", dbfile
);
542 /* devices with a database entry are initialized */
543 udev_device
->is_initialized
= true;
545 while (fgets(line
, sizeof(line
), f
)) {
548 struct udev_list_entry
*entry
;
557 strscpyl(filename
, sizeof(filename
), "/dev/", val
, NULL
);
558 udev_device_add_devlink(udev_device
, filename
);
561 udev_device_set_devlink_priority(udev_device
, atoi(val
));
564 entry
= udev_device_add_property_from_string(udev_device
, val
);
565 udev_list_entry_set_num(entry
, true);
568 udev_device_add_tag(udev_device
, val
);
571 udev_device_set_watch_handle(udev_device
, atoi(val
));
574 udev_device_set_usec_initialized(udev_device
, strtoull(val
, NULL
, 10));
580 log_debug("device %p filled with db file data", udev_device
);
584 int udev_device_read_uevent_file(struct udev_device
*udev_device
)
586 char filename
[UTIL_PATH_SIZE
];
588 char line
[UTIL_LINE_SIZE
];
592 if (udev_device
->uevent_loaded
)
595 strscpyl(filename
, sizeof(filename
), udev_device
->syspath
, "/uevent", NULL
);
596 f
= fopen(filename
, "re");
599 udev_device
->uevent_loaded
= true;
601 while (fgets(line
, sizeof(line
), f
)) {
604 pos
= strchr(line
, '\n');
609 if (startswith(line
, "DEVTYPE=")) {
610 udev_device_set_devtype(udev_device
, &line
[8]);
613 if (startswith(line
, "IFINDEX=")) {
614 udev_device_set_ifindex(udev_device
, strtoull(&line
[8], NULL
, 10));
617 if (startswith(line
, "DEVNAME=")) {
618 udev_device_set_devnode(udev_device
, &line
[8]);
622 if (startswith(line
, "MAJOR="))
623 maj
= strtoull(&line
[6], NULL
, 10);
624 else if (startswith(line
, "MINOR="))
625 min
= strtoull(&line
[6], NULL
, 10);
626 else if (startswith(line
, "DEVMODE="))
627 udev_device
->devnode_mode
= strtoul(&line
[8], NULL
, 8);
629 udev_device_add_property_from_string(udev_device
, line
);
632 udev_device
->devnum
= makedev(maj
, min
);
637 void udev_device_set_info_loaded(struct udev_device
*device
)
639 device
->info_loaded
= true;
642 struct udev_device
*udev_device_new(struct udev
*udev
)
644 struct udev_device
*udev_device
;
651 udev_device
= new0(struct udev_device
, 1);
652 if (udev_device
== NULL
) {
656 udev_device
->refcount
= 1;
657 udev_device
->udev
= udev
;
658 udev_list_init(udev
, &udev_device
->devlinks_list
, true);
659 udev_list_init(udev
, &udev_device
->properties_list
, true);
660 udev_list_init(udev
, &udev_device
->sysattr_value_list
, true);
661 udev_list_init(udev
, &udev_device
->sysattr_list
, false);
662 udev_list_init(udev
, &udev_device
->tags_list
, true);
663 udev_device
->watch_handle
= -1;
669 * udev_device_new_from_syspath:
670 * @udev: udev library context
671 * @syspath: sys device path including sys directory
673 * Create new udev device, and fill in information from the sys
674 * device and the udev database entry. The syspath is the absolute
675 * path to the device, including the sys mount point.
677 * The initial refcount is 1, and needs to be decremented to
678 * release the resources of the udev device.
680 * Returns: a new udev device, or #NULL, if it does not exist
682 _public_
struct udev_device
*udev_device_new_from_syspath(struct udev
*udev
, const char *syspath
)
685 char path
[UTIL_PATH_SIZE
];
688 struct udev_device
*udev_device
;
695 if (syspath
== NULL
) {
700 /* path starts in sys */
701 if (!startswith(syspath
, "/sys")) {
702 log_debug("not in sys :%s", syspath
);
707 /* path is not a root directory */
708 subdir
= syspath
+ strlen("/sys");
709 pos
= strrchr(subdir
, '/');
710 if (pos
== NULL
|| pos
[1] == '\0' || pos
< &subdir
[2]) {
715 /* resolve possible symlink to real path */
716 strscpy(path
, sizeof(path
), syspath
);
717 util_resolve_sys_link(udev
, path
, sizeof(path
));
719 if (startswith(path
+ strlen("/sys"), "/devices/")) {
720 char file
[UTIL_PATH_SIZE
];
722 /* all "devices" require a "uevent" file */
723 strscpyl(file
, sizeof(file
), path
, "/uevent", NULL
);
724 if (stat(file
, &statbuf
) != 0)
727 /* everything else just needs to be a directory */
728 if (stat(path
, &statbuf
) != 0 || !S_ISDIR(statbuf
.st_mode
))
732 udev_device
= udev_device_new(udev
);
733 if (udev_device
== NULL
)
736 udev_device_set_syspath(udev_device
, path
);
737 log_debug("device %p has devpath '%s'", udev_device
, udev_device_get_devpath(udev_device
));
743 * udev_device_new_from_devnum:
744 * @udev: udev library context
745 * @type: char or block device
746 * @devnum: device major/minor number
748 * Create new udev device, and fill in information from the sys
749 * device and the udev database entry. The device is looked-up
750 * by its major/minor number and type. Character and block device
751 * numbers are not unique across the two types.
753 * The initial refcount is 1, and needs to be decremented to
754 * release the resources of the udev device.
756 * Returns: a new udev device, or #NULL, if it does not exist
758 _public_
struct udev_device
*udev_device_new_from_devnum(struct udev
*udev
, char type
, dev_t devnum
)
760 char path
[UTIL_PATH_SIZE
];
761 const char *type_str
;
765 else if (type
== 'c')
772 /* use /sys/dev/{block,char}/<maj>:<min> link */
773 snprintf(path
, sizeof(path
), "/sys/dev/%s/%u:%u",
774 type_str
, major(devnum
), minor(devnum
));
775 return udev_device_new_from_syspath(udev
, path
);
779 * udev_device_new_from_device_id:
780 * @udev: udev library context
781 * @id: text string identifying a kernel device
783 * Create new udev device, and fill in information from the sys
784 * device and the udev database entry. The device is looked-up
785 * by a special string:
786 * b8:2 - block device major:minor
787 * c128:1 - char device major:minor
788 * n3 - network device ifindex
789 * +sound:card29 - kernel driver core subsystem:device name
791 * The initial refcount is 1, and needs to be decremented to
792 * release the resources of the udev device.
794 * Returns: a new udev device, or #NULL, if it does not exist
796 _public_
struct udev_device
*udev_device_new_from_device_id(struct udev
*udev
, const char *id
)
800 char subsys
[UTIL_PATH_SIZE
];
806 if (sscanf(id
, "%c%i:%i", &type
, &maj
, &min
) != 3)
808 return udev_device_new_from_devnum(udev
, type
, makedev(maj
, min
));
812 struct udev_device
*dev
;
815 ifindex
= strtoul(&id
[1], NULL
, 10);
821 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
824 memzero(&ifr
, sizeof(struct ifreq
));
825 ifr
.ifr_ifindex
= ifindex
;
826 if (ioctl(sk
, SIOCGIFNAME
, &ifr
) != 0) {
832 dev
= udev_device_new_from_subsystem_sysname(udev
, "net", ifr
.ifr_name
);
835 if (udev_device_get_ifindex(dev
) == ifindex
)
838 /* this is racy, so we may end up with the wrong device */
839 udev_device_unref(dev
);
844 strscpy(subsys
, sizeof(subsys
), &id
[1]);
845 sysname
= strchr(subsys
, ':');
846 if (sysname
== NULL
) {
851 sysname
= &sysname
[1];
852 return udev_device_new_from_subsystem_sysname(udev
, subsys
, sysname
);
860 * udev_device_new_from_subsystem_sysname:
861 * @udev: udev library context
862 * @subsystem: the subsystem of the device
863 * @sysname: the name of the device
865 * Create new udev device, and fill in information from the sys device
866 * and the udev database entry. The device is looked up by the subsystem
867 * and name string of the device, like "mem" / "zero", or "block" / "sda".
869 * The initial refcount is 1, and needs to be decremented to
870 * release the resources of the udev device.
872 * Returns: a new udev device, or #NULL, if it does not exist
874 _public_
struct udev_device
*udev_device_new_from_subsystem_sysname(struct udev
*udev
, const char *subsystem
, const char *sysname
)
876 char path
[UTIL_PATH_SIZE
];
879 if (streq(subsystem
, "subsystem")) {
880 strscpyl(path
, sizeof(path
), "/sys/subsystem/", sysname
, NULL
);
881 if (stat(path
, &statbuf
) == 0)
884 strscpyl(path
, sizeof(path
), "/sys/bus/", sysname
, NULL
);
885 if (stat(path
, &statbuf
) == 0)
888 strscpyl(path
, sizeof(path
), "/sys/class/", sysname
, NULL
);
889 if (stat(path
, &statbuf
) == 0)
894 if (streq(subsystem
, "module")) {
895 strscpyl(path
, sizeof(path
), "/sys/module/", sysname
, NULL
);
896 if (stat(path
, &statbuf
) == 0)
901 if (streq(subsystem
, "drivers")) {
902 char subsys
[UTIL_NAME_SIZE
];
905 strscpy(subsys
, sizeof(subsys
), sysname
);
906 driver
= strchr(subsys
, ':');
907 if (driver
!= NULL
) {
911 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsys
, "/drivers/", driver
, NULL
);
912 if (stat(path
, &statbuf
) == 0)
915 strscpyl(path
, sizeof(path
), "/sys/bus/", subsys
, "/drivers/", driver
, NULL
);
916 if (stat(path
, &statbuf
) == 0)
924 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsystem
, "/devices/", sysname
, NULL
);
925 if (stat(path
, &statbuf
) == 0)
928 strscpyl(path
, sizeof(path
), "/sys/bus/", subsystem
, "/devices/", sysname
, NULL
);
929 if (stat(path
, &statbuf
) == 0)
932 strscpyl(path
, sizeof(path
), "/sys/class/", subsystem
, "/", sysname
, NULL
);
933 if (stat(path
, &statbuf
) == 0)
938 return udev_device_new_from_syspath(udev
, path
);
942 * udev_device_new_from_environment
943 * @udev: udev library context
945 * Create new udev device, and fill in information from the
946 * current process environment. This only works reliable if
947 * the process is called from a udev rule. It is usually used
948 * for tools executed from IMPORT= rules.
950 * The initial refcount is 1, and needs to be decremented to
951 * release the resources of the udev device.
953 * Returns: a new udev device, or #NULL, if it does not exist
955 _public_
struct udev_device
*udev_device_new_from_environment(struct udev
*udev
)
958 struct udev_device
*udev_device
;
960 udev_device
= udev_device_new(udev
);
961 if (udev_device
== NULL
)
963 udev_device_set_info_loaded(udev_device
);
965 for (i
= 0; environ
[i
] != NULL
; i
++)
966 udev_device_add_property_from_string_parse(udev_device
, environ
[i
]);
968 if (udev_device_add_property_from_string_parse_finish(udev_device
) < 0) {
969 log_debug("missing values, invalid device");
970 udev_device_unref(udev_device
);
977 static struct udev_device
*device_new_from_parent(struct udev_device
*udev_device
)
979 struct udev_device
*udev_device_parent
= NULL
;
980 char path
[UTIL_PATH_SIZE
];
983 strscpy(path
, sizeof(path
), udev_device
->syspath
);
984 subdir
= path
+ strlen("/sys/");
988 pos
= strrchr(subdir
, '/');
989 if (pos
== NULL
|| pos
< &subdir
[2])
992 udev_device_parent
= udev_device_new_from_syspath(udev_device
->udev
, path
);
993 if (udev_device_parent
!= NULL
)
994 return udev_device_parent
;
1002 * udev_device_get_parent:
1003 * @udev_device: the device to start searching from
1005 * Find the next parent device, and fill in information from the sys
1006 * device and the udev database entry.
1008 * Returned device is not referenced. It is attached to the child
1009 * device, and will be cleaned up when the child device is cleaned up.
1011 * It is not necessarily just the upper level directory, empty or not
1012 * recognized sys directories are ignored.
1014 * It can be called as many times as needed, without caring about
1017 * Returns: a new udev device, or #NULL, if it no parent exist.
1019 _public_
struct udev_device
*udev_device_get_parent(struct udev_device
*udev_device
)
1021 if (udev_device
== NULL
) {
1025 if (!udev_device
->parent_set
) {
1026 udev_device
->parent_set
= true;
1027 udev_device
->parent_device
= device_new_from_parent(udev_device
);
1029 return udev_device
->parent_device
;
1033 * udev_device_get_parent_with_subsystem_devtype:
1034 * @udev_device: udev device to start searching from
1035 * @subsystem: the subsystem of the device
1036 * @devtype: the type (DEVTYPE) of the device
1038 * Find the next parent device, with a matching subsystem and devtype
1039 * value, and fill in information from the sys device and the udev
1042 * If devtype is #NULL, only subsystem is checked, and any devtype will
1045 * Returned device is not referenced. It is attached to the child
1046 * device, and will be cleaned up when the child device is cleaned up.
1048 * It can be called as many times as needed, without caring about
1051 * Returns: a new udev device, or #NULL if no matching parent exists.
1053 _public_
struct udev_device
*udev_device_get_parent_with_subsystem_devtype(struct udev_device
*udev_device
, const char *subsystem
, const char *devtype
)
1055 struct udev_device
*parent
;
1057 if (subsystem
== NULL
) {
1062 parent
= udev_device_get_parent(udev_device
);
1063 while (parent
!= NULL
) {
1064 const char *parent_subsystem
;
1065 const char *parent_devtype
;
1067 parent_subsystem
= udev_device_get_subsystem(parent
);
1068 if (parent_subsystem
!= NULL
&& streq(parent_subsystem
, subsystem
)) {
1069 if (devtype
== NULL
)
1071 parent_devtype
= udev_device_get_devtype(parent
);
1072 if (parent_devtype
!= NULL
&& streq(parent_devtype
, devtype
))
1075 parent
= udev_device_get_parent(parent
);
1085 * udev_device_get_udev:
1086 * @udev_device: udev device
1088 * Retrieve the udev library context the device was created with.
1090 * Returns: the udev library context
1092 _public_
struct udev
*udev_device_get_udev(struct udev_device
*udev_device
)
1094 if (udev_device
== NULL
)
1096 return udev_device
->udev
;
1101 * @udev_device: udev device
1103 * Take a reference of a udev device.
1105 * Returns: the passed udev device
1107 _public_
struct udev_device
*udev_device_ref(struct udev_device
*udev_device
)
1109 if (udev_device
== NULL
)
1111 udev_device
->refcount
++;
1116 * udev_device_unref:
1117 * @udev_device: udev device
1119 * Drop a reference of a udev device. If the refcount reaches zero,
1120 * the resources of the device will be released.
1124 _public_
struct udev_device
*udev_device_unref(struct udev_device
*udev_device
)
1126 if (udev_device
== NULL
)
1128 udev_device
->refcount
--;
1129 if (udev_device
->refcount
> 0)
1131 if (udev_device
->parent_device
!= NULL
)
1132 udev_device_unref(udev_device
->parent_device
);
1133 free(udev_device
->syspath
);
1134 free(udev_device
->sysname
);
1135 free(udev_device
->devnode
);
1136 free(udev_device
->subsystem
);
1137 free(udev_device
->devtype
);
1138 udev_list_cleanup(&udev_device
->devlinks_list
);
1139 udev_list_cleanup(&udev_device
->properties_list
);
1140 udev_list_cleanup(&udev_device
->sysattr_value_list
);
1141 udev_list_cleanup(&udev_device
->sysattr_list
);
1142 udev_list_cleanup(&udev_device
->tags_list
);
1143 free(udev_device
->action
);
1144 free(udev_device
->driver
);
1145 free(udev_device
->devpath_old
);
1146 free(udev_device
->id_filename
);
1147 free(udev_device
->envp
);
1148 free(udev_device
->monitor_buf
);
1154 * udev_device_get_devpath:
1155 * @udev_device: udev device
1157 * Retrieve the kernel devpath value of the udev device. The path
1158 * does not contain the sys mount point, and starts with a '/'.
1160 * Returns: the devpath of the udev device
1162 _public_
const char *udev_device_get_devpath(struct udev_device
*udev_device
)
1164 if (udev_device
== NULL
)
1166 return udev_device
->devpath
;
1170 * udev_device_get_syspath:
1171 * @udev_device: udev device
1173 * Retrieve the sys path of the udev device. The path is an
1174 * absolute path and starts with the sys mount point.
1176 * Returns: the sys path of the udev device
1178 _public_
const char *udev_device_get_syspath(struct udev_device
*udev_device
)
1180 if (udev_device
== NULL
)
1182 return udev_device
->syspath
;
1186 * udev_device_get_sysname:
1187 * @udev_device: udev device
1189 * Get the kernel device name in /sys.
1191 * Returns: the name string of the device device
1193 _public_
const char *udev_device_get_sysname(struct udev_device
*udev_device
)
1195 if (udev_device
== NULL
)
1197 return udev_device
->sysname
;
1201 * udev_device_get_sysnum:
1202 * @udev_device: udev device
1204 * Get the instance number of the device.
1206 * Returns: the trailing number string of the device name
1208 _public_
const char *udev_device_get_sysnum(struct udev_device
*udev_device
)
1210 if (udev_device
== NULL
)
1212 return udev_device
->sysnum
;
1216 * udev_device_get_devnode:
1217 * @udev_device: udev device
1219 * Retrieve the device node file name belonging to the udev device.
1220 * The path is an absolute path, and starts with the device directory.
1222 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1224 _public_
const char *udev_device_get_devnode(struct udev_device
*udev_device
)
1226 if (udev_device
== NULL
)
1228 if (udev_device
->devnode
!= NULL
)
1229 return udev_device
->devnode
;
1230 if (!udev_device
->info_loaded
)
1231 udev_device_read_uevent_file(udev_device
);
1232 return udev_device
->devnode
;
1236 * udev_device_get_devlinks_list_entry:
1237 * @udev_device: udev device
1239 * Retrieve the list of device links pointing to the device file of
1240 * the udev device. The next list entry can be retrieved with
1241 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1242 * The devlink path can be retrieved from the list entry by
1243 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1244 * the device directory.
1246 * Returns: the first entry of the device node link list
1248 _public_
struct udev_list_entry
*udev_device_get_devlinks_list_entry(struct udev_device
*udev_device
)
1250 if (udev_device
== NULL
)
1252 if (!udev_device
->info_loaded
)
1253 udev_device_read_db(udev_device
, NULL
);
1254 return udev_list_get_entry(&udev_device
->devlinks_list
);
1257 void udev_device_cleanup_devlinks_list(struct udev_device
*udev_device
)
1259 udev_device
->devlinks_uptodate
= false;
1260 udev_list_cleanup(&udev_device
->devlinks_list
);
1264 * udev_device_get_properties_list_entry:
1265 * @udev_device: udev device
1267 * Retrieve the list of key/value device properties of the udev
1268 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1269 * which returns #NULL if no more entries exist. The property name
1270 * can be retrieved from the list entry by udev_list_entry_get_name(),
1271 * the property value by udev_list_entry_get_value().
1273 * Returns: the first entry of the property list
1275 _public_
struct udev_list_entry
*udev_device_get_properties_list_entry(struct udev_device
*udev_device
)
1277 if (udev_device
== NULL
)
1279 if (!udev_device
->info_loaded
) {
1280 udev_device_read_uevent_file(udev_device
);
1281 udev_device_read_db(udev_device
, NULL
);
1283 if (!udev_device
->devlinks_uptodate
) {
1284 char symlinks
[UTIL_PATH_SIZE
];
1285 struct udev_list_entry
*list_entry
;
1287 udev_device
->devlinks_uptodate
= true;
1288 list_entry
= udev_device_get_devlinks_list_entry(udev_device
);
1289 if (list_entry
!= NULL
) {
1294 l
= strpcpyl(&s
, sizeof(symlinks
), udev_list_entry_get_name(list_entry
), NULL
);
1295 udev_list_entry_foreach(list_entry
, udev_list_entry_get_next(list_entry
))
1296 l
= strpcpyl(&s
, l
, " ", udev_list_entry_get_name(list_entry
), NULL
);
1297 udev_device_add_property(udev_device
, "DEVLINKS", symlinks
);
1300 if (!udev_device
->tags_uptodate
) {
1301 udev_device
->tags_uptodate
= true;
1302 if (udev_device_get_tags_list_entry(udev_device
) != NULL
) {
1303 char tags
[UTIL_PATH_SIZE
];
1304 struct udev_list_entry
*list_entry
;
1309 l
= strpcpyl(&s
, sizeof(tags
), ":", NULL
);
1310 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(udev_device
))
1311 l
= strpcpyl(&s
, l
, udev_list_entry_get_name(list_entry
), ":", NULL
);
1312 udev_device_add_property(udev_device
, "TAGS", tags
);
1315 return udev_list_get_entry(&udev_device
->properties_list
);
1319 * udev_device_get_action:
1320 * @udev_device: udev device
1322 * This is only valid if the device was received through a monitor. Devices read from
1323 * sys do not have an action string. Usual actions are: add, remove, change, online,
1326 * Returns: the kernel action value, or #NULL if there is no action value available.
1328 _public_
const char *udev_device_get_action(struct udev_device
*udev_device
)
1330 if (udev_device
== NULL
)
1332 return udev_device
->action
;
1336 * udev_device_get_usec_since_initialized:
1337 * @udev_device: udev device
1339 * Return the number of microseconds passed since udev set up the
1340 * device for the first time.
1342 * This is only implemented for devices with need to store properties
1343 * in the udev database. All other devices return 0 here.
1345 * Returns: the number of microseconds since the device was first seen.
1347 _public_
unsigned long long int udev_device_get_usec_since_initialized(struct udev_device
*udev_device
)
1351 if (udev_device
== NULL
)
1353 if (!udev_device
->info_loaded
)
1354 udev_device_read_db(udev_device
, NULL
);
1355 if (udev_device
->usec_initialized
== 0)
1357 now_ts
= now(CLOCK_MONOTONIC
);
1360 return now_ts
- udev_device
->usec_initialized
;
1363 usec_t
udev_device_get_usec_initialized(struct udev_device
*udev_device
)
1365 return udev_device
->usec_initialized
;
1368 void udev_device_set_usec_initialized(struct udev_device
*udev_device
, usec_t usec_initialized
)
1372 udev_device
->usec_initialized
= usec_initialized
;
1373 snprintf(num
, sizeof(num
), USEC_FMT
, usec_initialized
);
1374 udev_device_add_property(udev_device
, "USEC_INITIALIZED", num
);
1378 * udev_device_get_sysattr_value:
1379 * @udev_device: udev device
1380 * @sysattr: attribute name
1382 * The retrieved value is cached in the device. Repeated calls will return the same
1383 * value and not open the attribute again.
1385 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1387 _public_
const char *udev_device_get_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
)
1389 struct udev_list_entry
*list_entry
;
1390 char path
[UTIL_PATH_SIZE
];
1392 struct stat statbuf
;
1395 const char *val
= NULL
;
1397 if (udev_device
== NULL
)
1399 if (sysattr
== NULL
)
1402 /* look for possibly already cached result */
1403 list_entry
= udev_list_get_entry(&udev_device
->sysattr_value_list
);
1404 list_entry
= udev_list_entry_get_by_name(list_entry
, sysattr
);
1405 if (list_entry
!= NULL
)
1406 return udev_list_entry_get_value(list_entry
);
1408 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", sysattr
, NULL
);
1409 if (lstat(path
, &statbuf
) != 0) {
1410 udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, NULL
);
1414 if (S_ISLNK(statbuf
.st_mode
)) {
1416 * Some core links return only the last element of the target path,
1417 * these are just values, the paths should not be exposed.
1419 if (streq(sysattr
, "driver") ||
1420 streq(sysattr
, "subsystem") ||
1421 streq(sysattr
, "module")) {
1422 if (util_get_sys_core_link_value(udev_device
->udev
, sysattr
,
1423 udev_device
->syspath
, value
, sizeof(value
)) < 0)
1425 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1426 val
= udev_list_entry_get_value(list_entry
);
1433 /* skip directories */
1434 if (S_ISDIR(statbuf
.st_mode
))
1437 /* skip non-readable files */
1438 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1441 /* read attribute value */
1442 fd
= open(path
, O_RDONLY
|O_CLOEXEC
);
1445 size
= read(fd
, value
, sizeof(value
));
1449 if (size
== sizeof(value
))
1452 /* got a valid value, store it in cache and return it */
1454 util_remove_trailing_chars(value
, '\n');
1455 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1456 val
= udev_list_entry_get_value(list_entry
);
1462 * udev_device_set_sysattr_value:
1463 * @udev_device: udev device
1464 * @sysattr: attribute name
1465 * @value: new value to be set
1467 * Update the contents of the sys attribute and the cached value of the device.
1469 * Returns: Negative error code on failure or 0 on success.
1471 _public_
int udev_device_set_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
, char *value
)
1473 struct udev_device
*dev
;
1474 char path
[UTIL_PATH_SIZE
];
1475 struct stat statbuf
;
1477 ssize_t size
, value_len
;
1480 if (udev_device
== NULL
)
1483 if (sysattr
== NULL
)
1488 value_len
= strlen(value
);
1490 strscpyl(path
, sizeof(path
), udev_device_get_syspath(dev
), "/", sysattr
, NULL
);
1491 if (lstat(path
, &statbuf
) != 0) {
1492 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, NULL
);
1497 if (S_ISLNK(statbuf
.st_mode
)) {
1502 /* skip directories */
1503 if (S_ISDIR(statbuf
.st_mode
)) {
1508 /* skip non-readable files */
1509 if ((statbuf
.st_mode
& S_IRUSR
) == 0) {
1514 /* Value is limited to 4k */
1515 if (value_len
> 4096) {
1519 util_remove_trailing_chars(value
, '\n');
1521 /* write attribute value */
1522 fd
= open(path
, O_WRONLY
|O_CLOEXEC
);
1527 size
= write(fd
, value
, value_len
);
1533 if (size
< value_len
) {
1538 /* wrote a valid value, store it in cache and return it */
1539 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, value
);
1541 if (dev
!= udev_device
)
1542 udev_device_unref(dev
);
1546 static int udev_device_sysattr_list_read(struct udev_device
*udev_device
)
1548 struct dirent
*dent
;
1552 if (udev_device
== NULL
)
1554 if (udev_device
->sysattr_list_read
)
1557 dir
= opendir(udev_device_get_syspath(udev_device
));
1561 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
1562 char path
[UTIL_PATH_SIZE
];
1563 struct stat statbuf
;
1565 /* only handle symlinks and regular files */
1566 if (dent
->d_type
!= DT_LNK
&& dent
->d_type
!= DT_REG
)
1569 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", dent
->d_name
, NULL
);
1570 if (lstat(path
, &statbuf
) != 0)
1572 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1575 udev_list_entry_add(&udev_device
->sysattr_list
, dent
->d_name
, NULL
);
1580 udev_device
->sysattr_list_read
= true;
1586 * udev_device_get_sysattr_list_entry:
1587 * @udev_device: udev device
1589 * Retrieve the list of available sysattrs, with value being empty;
1590 * This just return all available sysfs attributes for a particular
1591 * device without reading their values.
1593 * Returns: the first entry of the property list
1595 _public_
struct udev_list_entry
*udev_device_get_sysattr_list_entry(struct udev_device
*udev_device
)
1597 if (!udev_device
->sysattr_list_read
) {
1599 ret
= udev_device_sysattr_list_read(udev_device
);
1604 return udev_list_get_entry(&udev_device
->sysattr_list
);
1607 int udev_device_set_syspath(struct udev_device
*udev_device
, const char *syspath
)
1612 free(udev_device
->syspath
);
1613 udev_device
->syspath
= strdup(syspath
);
1614 if (udev_device
->syspath
== NULL
)
1616 udev_device
->devpath
= udev_device
->syspath
+ strlen("/sys");
1617 udev_device_add_property(udev_device
, "DEVPATH", udev_device
->devpath
);
1619 pos
= strrchr(udev_device
->syspath
, '/');
1622 udev_device
->sysname
= strdup(&pos
[1]);
1623 if (udev_device
->sysname
== NULL
)
1626 /* some devices have '!' in their name, change that to '/' */
1628 while (udev_device
->sysname
[len
] != '\0') {
1629 if (udev_device
->sysname
[len
] == '!')
1630 udev_device
->sysname
[len
] = '/';
1634 /* trailing number */
1635 while (len
> 0 && isdigit(udev_device
->sysname
[--len
]))
1636 udev_device
->sysnum
= &udev_device
->sysname
[len
];
1638 /* sysname is completely numeric */
1640 udev_device
->sysnum
= NULL
;
1645 static int udev_device_set_devnode(struct udev_device
*udev_device
, const char *devnode
)
1647 free(udev_device
->devnode
);
1648 if (devnode
[0] != '/') {
1649 if (asprintf(&udev_device
->devnode
, "/dev/%s", devnode
) < 0)
1650 udev_device
->devnode
= NULL
;
1652 udev_device
->devnode
= strdup(devnode
);
1654 if (udev_device
->devnode
== NULL
)
1656 udev_device_add_property(udev_device
, "DEVNAME", udev_device
->devnode
);
1660 int udev_device_add_devlink(struct udev_device
*udev_device
, const char *devlink
)
1662 struct udev_list_entry
*list_entry
;
1664 udev_device
->devlinks_uptodate
= false;
1665 list_entry
= udev_list_entry_add(&udev_device
->devlinks_list
, devlink
, NULL
);
1666 if (list_entry
== NULL
)
1671 const char *udev_device_get_id_filename(struct udev_device
*udev_device
)
1673 if (udev_device
->id_filename
== NULL
) {
1674 if (udev_device_get_subsystem(udev_device
) == NULL
)
1677 if (major(udev_device_get_devnum(udev_device
)) > 0) {
1678 /* use dev_t -- b259:131072, c254:0 */
1679 if (asprintf(&udev_device
->id_filename
, "%c%u:%u",
1680 streq(udev_device_get_subsystem(udev_device
), "block") ? 'b' : 'c',
1681 major(udev_device_get_devnum(udev_device
)),
1682 minor(udev_device_get_devnum(udev_device
))) < 0)
1683 udev_device
->id_filename
= NULL
;
1684 } else if (udev_device_get_ifindex(udev_device
) > 0) {
1685 /* use netdev ifindex -- n3 */
1686 if (asprintf(&udev_device
->id_filename
, "n%u", udev_device_get_ifindex(udev_device
)) < 0)
1687 udev_device
->id_filename
= NULL
;
1690 * use $subsys:$syname -- pci:0000:00:1f.2
1691 * sysname() has '!' translated, get it from devpath
1693 const char *sysname
;
1694 sysname
= strrchr(udev_device
->devpath
, '/');
1695 if (sysname
== NULL
)
1697 sysname
= &sysname
[1];
1698 if (asprintf(&udev_device
->id_filename
, "+%s:%s", udev_device_get_subsystem(udev_device
), sysname
) < 0)
1699 udev_device
->id_filename
= NULL
;
1702 return udev_device
->id_filename
;
1706 * udev_device_get_is_initialized:
1707 * @udev_device: udev device
1709 * Check if udev has already handled the device and has set up
1710 * device node permissions and context, or has renamed a network
1713 * This is only implemented for devices with a device node
1714 * or network interfaces. All other devices return 1 here.
1716 * Returns: 1 if the device is set up. 0 otherwise.
1718 _public_
int udev_device_get_is_initialized(struct udev_device
*udev_device
)
1720 if (!udev_device
->info_loaded
)
1721 udev_device_read_db(udev_device
, NULL
);
1722 return udev_device
->is_initialized
;
1725 void udev_device_set_is_initialized(struct udev_device
*udev_device
)
1727 udev_device
->is_initialized
= true;
1730 static bool is_valid_tag(const char *tag
)
1732 return !strchr(tag
, ':') && !strchr(tag
, ' ');
1735 int udev_device_add_tag(struct udev_device
*udev_device
, const char *tag
)
1737 if (!is_valid_tag(tag
))
1739 udev_device
->tags_uptodate
= false;
1740 if (udev_list_entry_add(&udev_device
->tags_list
, tag
, NULL
) != NULL
)
1745 void udev_device_remove_tag(struct udev_device
*udev_device
, const char *tag
)
1747 struct udev_list_entry
*e
;
1749 if (!is_valid_tag(tag
))
1751 e
= udev_list_get_entry(&udev_device
->tags_list
);
1752 e
= udev_list_entry_get_by_name(e
, tag
);
1754 udev_device
->tags_uptodate
= false;
1755 udev_list_entry_delete(e
);
1759 void udev_device_cleanup_tags_list(struct udev_device
*udev_device
)
1761 udev_device
->tags_uptodate
= false;
1762 udev_list_cleanup(&udev_device
->tags_list
);
1766 * udev_device_get_tags_list_entry:
1767 * @udev_device: udev device
1769 * Retrieve the list of tags attached to the udev device. The next
1770 * list entry can be retrieved with udev_list_entry_get_next(),
1771 * which returns #NULL if no more entries exist. The tag string
1772 * can be retrieved from the list entry by udev_list_entry_get_name().
1774 * Returns: the first entry of the tag list
1776 _public_
struct udev_list_entry
*udev_device_get_tags_list_entry(struct udev_device
*udev_device
)
1778 if (udev_device
== NULL
)
1780 if (!udev_device
->info_loaded
)
1781 udev_device_read_db(udev_device
, NULL
);
1782 return udev_list_get_entry(&udev_device
->tags_list
);
1786 * udev_device_has_tag:
1787 * @udev_device: udev device
1790 * Check if a given device has a certain tag associated.
1792 * Returns: 1 if the tag is found. 0 otherwise.
1794 _public_
int udev_device_has_tag(struct udev_device
*udev_device
, const char *tag
)
1796 struct udev_list_entry
*list_entry
;
1798 if (udev_device
== NULL
)
1800 if (!udev_device
->info_loaded
)
1801 udev_device_read_db(udev_device
, NULL
);
1802 list_entry
= udev_device_get_tags_list_entry(udev_device
);
1803 if (udev_list_entry_get_by_name(list_entry
, tag
) != NULL
)
1808 #define ENVP_SIZE 128
1809 #define MONITOR_BUF_SIZE 4096
1810 static int update_envp_monitor_buf(struct udev_device
*udev_device
)
1812 struct udev_list_entry
*list_entry
;
1817 /* monitor buffer of property strings */
1818 free(udev_device
->monitor_buf
);
1819 udev_device
->monitor_buf_len
= 0;
1820 udev_device
->monitor_buf
= malloc(MONITOR_BUF_SIZE
);
1821 if (udev_device
->monitor_buf
== NULL
)
1824 /* envp array, strings will point into monitor buffer */
1825 if (udev_device
->envp
== NULL
)
1826 udev_device
->envp
= malloc(sizeof(char *) * ENVP_SIZE
);
1827 if (udev_device
->envp
== NULL
)
1831 s
= udev_device
->monitor_buf
;
1832 l
= MONITOR_BUF_SIZE
;
1833 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(udev_device
)) {
1836 key
= udev_list_entry_get_name(list_entry
);
1837 /* skip private variables */
1841 /* add string to envp array */
1842 udev_device
->envp
[i
++] = s
;
1843 if (i
+1 >= ENVP_SIZE
)
1846 /* add property string to monitor buffer */
1847 l
= strpcpyl(&s
, l
, key
, "=", udev_list_entry_get_value(list_entry
), NULL
);
1850 /* advance past the trailing '\0' that strpcpyl() guarantees */
1854 udev_device
->envp
[i
] = NULL
;
1855 udev_device
->monitor_buf_len
= s
- udev_device
->monitor_buf
;
1856 udev_device
->envp_uptodate
= true;
1860 char **udev_device_get_properties_envp(struct udev_device
*udev_device
)
1862 if (!udev_device
->envp_uptodate
)
1863 if (update_envp_monitor_buf(udev_device
) != 0)
1865 return udev_device
->envp
;
1868 ssize_t
udev_device_get_properties_monitor_buf(struct udev_device
*udev_device
, const char **buf
)
1870 if (!udev_device
->envp_uptodate
)
1871 if (update_envp_monitor_buf(udev_device
) != 0)
1873 *buf
= udev_device
->monitor_buf
;
1874 return udev_device
->monitor_buf_len
;
1877 int udev_device_set_action(struct udev_device
*udev_device
, const char *action
)
1879 free(udev_device
->action
);
1880 udev_device
->action
= strdup(action
);
1881 if (udev_device
->action
== NULL
)
1883 udev_device_add_property(udev_device
, "ACTION", udev_device
->action
);
1887 int udev_device_get_devlink_priority(struct udev_device
*udev_device
)
1889 if (!udev_device
->info_loaded
)
1890 udev_device_read_db(udev_device
, NULL
);
1891 return udev_device
->devlink_priority
;
1894 int udev_device_set_devlink_priority(struct udev_device
*udev_device
, int prio
)
1896 udev_device
->devlink_priority
= prio
;
1900 int udev_device_get_watch_handle(struct udev_device
*udev_device
)
1902 if (!udev_device
->info_loaded
)
1903 udev_device_read_db(udev_device
, NULL
);
1904 return udev_device
->watch_handle
;
1907 int udev_device_set_watch_handle(struct udev_device
*udev_device
, int handle
)
1909 udev_device
->watch_handle
= handle
;
1913 bool udev_device_get_db_persist(struct udev_device
*udev_device
)
1915 return udev_device
->db_persist
;
1918 void udev_device_set_db_persist(struct udev_device
*udev_device
)
1920 udev_device
->db_persist
= true;