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 static 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 udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile);
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 udev_dbg(udev_device->udev, "device %p filled with db file data\n", 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;
643 struct udev_list_entry *list_entry;
648 udev_device = calloc(1, sizeof(struct udev_device));
649 if (udev_device == NULL)
651 udev_device->refcount = 1;
652 udev_device->udev = udev;
653 udev_list_init(udev, &udev_device->devlinks_list, true);
654 udev_list_init(udev, &udev_device->properties_list, true);
655 udev_list_init(udev, &udev_device->sysattr_value_list, true);
656 udev_list_init(udev, &udev_device->sysattr_list, false);
657 udev_list_init(udev, &udev_device->tags_list, true);
658 udev_device->watch_handle = -1;
659 /* copy global properties */
660 udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
661 udev_device_add_property(udev_device,
662 udev_list_entry_get_name(list_entry),
663 udev_list_entry_get_value(list_entry));
668 * udev_device_new_from_syspath:
669 * @udev: udev library context
670 * @syspath: sys device path including sys directory
672 * Create new udev device, and fill in information from the sys
673 * device and the udev database entry. The syspath is the absolute
674 * path to the device, including the sys mount point.
676 * The initial refcount is 1, and needs to be decremented to
677 * release the resources of the udev device.
679 * Returns: a new udev device, or #NULL, if it does not exist
681 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
684 char path[UTIL_PATH_SIZE];
687 struct udev_device *udev_device;
694 /* path starts in sys */
695 if (!startswith(syspath, "/sys")) {
696 udev_dbg(udev, "not in sys :%s\n", syspath);
700 /* path is not a root directory */
701 subdir = syspath + strlen("/sys");
702 pos = strrchr(subdir, '/');
703 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2])
706 /* resolve possible symlink to real path */
707 strscpy(path, sizeof(path), syspath);
708 util_resolve_sys_link(udev, path, sizeof(path));
710 if (startswith(path + strlen("/sys"), "/devices/")) {
711 char file[UTIL_PATH_SIZE];
713 /* all "devices" require a "uevent" file */
714 strscpyl(file, sizeof(file), path, "/uevent", NULL);
715 if (stat(file, &statbuf) != 0)
718 /* everything else just needs to be a directory */
719 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
723 udev_device = udev_device_new(udev);
724 if (udev_device == NULL)
727 udev_device_set_syspath(udev_device, path);
728 udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
734 * udev_device_new_from_devnum:
735 * @udev: udev library context
736 * @type: char or block device
737 * @devnum: device major/minor number
739 * Create new udev device, and fill in information from the sys
740 * device and the udev database entry. The device is looked-up
741 * by its major/minor number and type. Character and block device
742 * numbers are not unique across the two types.
744 * The initial refcount is 1, and needs to be decremented to
745 * release the resources of the udev device.
747 * Returns: a new udev device, or #NULL, if it does not exist
749 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
751 char path[UTIL_PATH_SIZE];
752 const char *type_str;
756 else if (type == 'c')
761 /* use /sys/dev/{block,char}/<maj>:<min> link */
762 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
763 type_str, major(devnum), minor(devnum));
764 return udev_device_new_from_syspath(udev, path);
768 * udev_device_new_from_device_id:
769 * @udev: udev library context
770 * @id: text string identifying a kernel device
772 * Create new udev device, and fill in information from the sys
773 * device and the udev database entry. The device is looked-up
774 * by a special string:
775 * b8:2 - block device major:minor
776 * c128:1 - char device major:minor
777 * n3 - network device ifindex
778 * +sound:card29 - kernel driver core subsystem:device name
780 * The initial refcount is 1, and needs to be decremented to
781 * release the resources of the udev device.
783 * Returns: a new udev device, or #NULL, if it does not exist
785 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
789 char subsys[UTIL_PATH_SIZE];
795 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
797 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
801 struct udev_device *dev;
804 ifindex = strtoul(&id[1], NULL, 10);
808 sk = socket(PF_INET, SOCK_DGRAM, 0);
811 memset(&ifr, 0x00, sizeof(struct ifreq));
812 ifr.ifr_ifindex = ifindex;
813 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
819 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
822 if (udev_device_get_ifindex(dev) == ifindex)
824 udev_device_unref(dev);
828 strscpy(subsys, sizeof(subsys), &id[1]);
829 sysname = strchr(subsys, ':');
833 sysname = &sysname[1];
834 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
841 * udev_device_new_from_subsystem_sysname:
842 * @udev: udev library context
843 * @subsystem: the subsystem of the device
844 * @sysname: the name of the device
846 * Create new udev device, and fill in information from the sys device
847 * and the udev database entry. The device is looked up by the subsystem
848 * and name string of the device, like "mem" / "zero", or "block" / "sda".
850 * The initial refcount is 1, and needs to be decremented to
851 * release the resources of the udev device.
853 * Returns: a new udev device, or #NULL, if it does not exist
855 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
857 char path[UTIL_PATH_SIZE];
860 if (streq(subsystem, "subsystem")) {
861 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
862 if (stat(path, &statbuf) == 0)
865 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
866 if (stat(path, &statbuf) == 0)
869 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
870 if (stat(path, &statbuf) == 0)
875 if (streq(subsystem, "module")) {
876 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
877 if (stat(path, &statbuf) == 0)
882 if (streq(subsystem, "drivers")) {
883 char subsys[UTIL_NAME_SIZE];
886 strscpy(subsys, sizeof(subsys), sysname);
887 driver = strchr(subsys, ':');
888 if (driver != NULL) {
892 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
893 if (stat(path, &statbuf) == 0)
896 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
897 if (stat(path, &statbuf) == 0)
903 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
904 if (stat(path, &statbuf) == 0)
907 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
908 if (stat(path, &statbuf) == 0)
911 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
912 if (stat(path, &statbuf) == 0)
917 return udev_device_new_from_syspath(udev, path);
921 * udev_device_new_from_environment
922 * @udev: udev library context
924 * Create new udev device, and fill in information from the
925 * current process environment. This only works reliable if
926 * the process is called from a udev rule. It is usually used
927 * for tools executed from IMPORT= rules.
929 * The initial refcount is 1, and needs to be decremented to
930 * release the resources of the udev device.
932 * Returns: a new udev device, or #NULL, if it does not exist
934 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
937 struct udev_device *udev_device;
939 udev_device = udev_device_new(udev);
940 if (udev_device == NULL)
942 udev_device_set_info_loaded(udev_device);
944 for (i = 0; environ[i] != NULL; i++)
945 udev_device_add_property_from_string_parse(udev_device, environ[i]);
947 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
948 udev_dbg(udev, "missing values, invalid device\n");
949 udev_device_unref(udev_device);
956 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
958 struct udev_device *udev_device_parent = NULL;
959 char path[UTIL_PATH_SIZE];
962 strscpy(path, sizeof(path), udev_device->syspath);
963 subdir = path + strlen("/sys/");
967 pos = strrchr(subdir, '/');
968 if (pos == NULL || pos < &subdir[2])
971 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
972 if (udev_device_parent != NULL)
973 return udev_device_parent;
979 * udev_device_get_parent:
980 * @udev_device: the device to start searching from
982 * Find the next parent device, and fill in information from the sys
983 * device and the udev database entry.
985 * Returned device is not referenced. It is attached to the child
986 * device, and will be cleaned up when the child device is cleaned up.
988 * It is not necessarily just the upper level directory, empty or not
989 * recognized sys directories are ignored.
991 * It can be called as many times as needed, without caring about
994 * Returns: a new udev device, or #NULL, if it no parent exist.
996 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
998 if (udev_device == NULL)
1000 if (!udev_device->parent_set) {
1001 udev_device->parent_set = true;
1002 udev_device->parent_device = device_new_from_parent(udev_device);
1004 return udev_device->parent_device;
1008 * udev_device_get_parent_with_subsystem_devtype:
1009 * @udev_device: udev device to start searching from
1010 * @subsystem: the subsystem of the device
1011 * @devtype: the type (DEVTYPE) of the device
1013 * Find the next parent device, with a matching subsystem and devtype
1014 * value, and fill in information from the sys device and the udev
1017 * If devtype is #NULL, only subsystem is checked, and any devtype will
1020 * Returned device is not referenced. It is attached to the child
1021 * device, and will be cleaned up when the child device is cleaned up.
1023 * It can be called as many times as needed, without caring about
1026 * Returns: a new udev device, or #NULL if no matching parent exists.
1028 _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
1030 struct udev_device *parent;
1032 if (subsystem == NULL)
1035 parent = udev_device_get_parent(udev_device);
1036 while (parent != NULL) {
1037 const char *parent_subsystem;
1038 const char *parent_devtype;
1040 parent_subsystem = udev_device_get_subsystem(parent);
1041 if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
1042 if (devtype == NULL)
1044 parent_devtype = udev_device_get_devtype(parent);
1045 if (parent_devtype != NULL && streq(parent_devtype, devtype))
1048 parent = udev_device_get_parent(parent);
1054 * udev_device_get_udev:
1055 * @udev_device: udev device
1057 * Retrieve the udev library context the device was created with.
1059 * Returns: the udev library context
1061 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
1063 if (udev_device == NULL)
1065 return udev_device->udev;
1070 * @udev_device: udev device
1072 * Take a reference of a udev device.
1074 * Returns: the passed udev device
1076 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
1078 if (udev_device == NULL)
1080 udev_device->refcount++;
1085 * udev_device_unref:
1086 * @udev_device: udev device
1088 * Drop a reference of a udev device. If the refcount reaches zero,
1089 * the resources of the device will be released.
1093 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
1095 if (udev_device == NULL)
1097 udev_device->refcount--;
1098 if (udev_device->refcount > 0)
1100 if (udev_device->parent_device != NULL)
1101 udev_device_unref(udev_device->parent_device);
1102 free(udev_device->syspath);
1103 free(udev_device->sysname);
1104 free(udev_device->devnode);
1105 free(udev_device->subsystem);
1106 free(udev_device->devtype);
1107 udev_list_cleanup(&udev_device->devlinks_list);
1108 udev_list_cleanup(&udev_device->properties_list);
1109 udev_list_cleanup(&udev_device->sysattr_value_list);
1110 udev_list_cleanup(&udev_device->sysattr_list);
1111 udev_list_cleanup(&udev_device->tags_list);
1112 free(udev_device->action);
1113 free(udev_device->driver);
1114 free(udev_device->devpath_old);
1115 free(udev_device->id_filename);
1116 free(udev_device->envp);
1117 free(udev_device->monitor_buf);
1123 * udev_device_get_devpath:
1124 * @udev_device: udev device
1126 * Retrieve the kernel devpath value of the udev device. The path
1127 * does not contain the sys mount point, and starts with a '/'.
1129 * Returns: the devpath of the udev device
1131 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
1133 if (udev_device == NULL)
1135 return udev_device->devpath;
1139 * udev_device_get_syspath:
1140 * @udev_device: udev device
1142 * Retrieve the sys path of the udev device. The path is an
1143 * absolute path and starts with the sys mount point.
1145 * Returns: the sys path of the udev device
1147 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
1149 if (udev_device == NULL)
1151 return udev_device->syspath;
1155 * udev_device_get_sysname:
1156 * @udev_device: udev device
1158 * Get the kernel device name in /sys.
1160 * Returns: the name string of the device device
1162 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
1164 if (udev_device == NULL)
1166 return udev_device->sysname;
1170 * udev_device_get_sysnum:
1171 * @udev_device: udev device
1173 * Get the instance number of the device.
1175 * Returns: the trailing number string of the device name
1177 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
1179 if (udev_device == NULL)
1181 return udev_device->sysnum;
1185 * udev_device_get_devnode:
1186 * @udev_device: udev device
1188 * Retrieve the device node file name belonging to the udev device.
1189 * The path is an absolute path, and starts with the device directory.
1191 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1193 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
1195 if (udev_device == NULL)
1197 if (udev_device->devnode != NULL)
1198 return udev_device->devnode;
1199 if (!udev_device->info_loaded)
1200 udev_device_read_uevent_file(udev_device);
1201 return udev_device->devnode;
1205 * udev_device_get_devlinks_list_entry:
1206 * @udev_device: udev device
1208 * Retrieve the list of device links pointing to the device file of
1209 * the udev device. The next list entry can be retrieved with
1210 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1211 * The devlink path can be retrieved from the list entry by
1212 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1213 * the device directory.
1215 * Returns: the first entry of the device node link list
1217 _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
1219 if (udev_device == NULL)
1221 if (!udev_device->info_loaded)
1222 udev_device_read_db(udev_device, NULL);
1223 return udev_list_get_entry(&udev_device->devlinks_list);
1226 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
1228 udev_device->devlinks_uptodate = false;
1229 udev_list_cleanup(&udev_device->devlinks_list);
1233 * udev_device_get_properties_list_entry:
1234 * @udev_device: udev device
1236 * Retrieve the list of key/value device properties of the udev
1237 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1238 * which returns #NULL if no more entries exist. The property name
1239 * can be retrieved from the list entry by udev_list_entry_get_name(),
1240 * the property value by udev_list_entry_get_value().
1242 * Returns: the first entry of the property list
1244 _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
1246 if (udev_device == NULL)
1248 if (!udev_device->info_loaded) {
1249 udev_device_read_uevent_file(udev_device);
1250 udev_device_read_db(udev_device, NULL);
1252 if (!udev_device->devlinks_uptodate) {
1253 char symlinks[UTIL_PATH_SIZE];
1254 struct udev_list_entry *list_entry;
1256 udev_device->devlinks_uptodate = true;
1257 list_entry = udev_device_get_devlinks_list_entry(udev_device);
1258 if (list_entry != NULL) {
1263 l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
1264 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
1265 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1266 udev_device_add_property(udev_device, "DEVLINKS", symlinks);
1269 if (!udev_device->tags_uptodate) {
1270 udev_device->tags_uptodate = true;
1271 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1272 char tags[UTIL_PATH_SIZE];
1273 struct udev_list_entry *list_entry;
1278 l = strpcpyl(&s, sizeof(tags), ":", NULL);
1279 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1280 l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1281 udev_device_add_property(udev_device, "TAGS", tags);
1284 return udev_list_get_entry(&udev_device->properties_list);
1288 * udev_device_get_action:
1289 * @udev_device: udev device
1291 * This is only valid if the device was received through a monitor. Devices read from
1292 * sys do not have an action string. Usual actions are: add, remove, change, online,
1295 * Returns: the kernel action value, or #NULL if there is no action value available.
1297 _public_ const char *udev_device_get_action(struct udev_device *udev_device)
1299 if (udev_device == NULL)
1301 return udev_device->action;
1305 * udev_device_get_usec_since_initialized:
1306 * @udev_device: udev device
1308 * Return the number of microseconds passed since udev set up the
1309 * device for the first time.
1311 * This is only implemented for devices with need to store properties
1312 * in the udev database. All other devices return 0 here.
1314 * Returns: the number of microseconds since the device was first seen.
1316 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
1320 if (udev_device == NULL)
1322 if (!udev_device->info_loaded)
1323 udev_device_read_db(udev_device, NULL);
1324 if (udev_device->usec_initialized == 0)
1326 now_ts = now(CLOCK_MONOTONIC);
1329 return now_ts - udev_device->usec_initialized;
1332 usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
1334 return udev_device->usec_initialized;
1337 void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
1341 udev_device->usec_initialized = usec_initialized;
1342 snprintf(num, sizeof(num), "%llu", (unsigned long long)usec_initialized);
1343 udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
1347 * udev_device_get_sysattr_value:
1348 * @udev_device: udev device
1349 * @sysattr: attribute name
1351 * The retrieved value is cached in the device. Repeated calls will return the same
1352 * value and not open the attribute again.
1354 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1356 _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1358 struct udev_list_entry *list_entry;
1359 char path[UTIL_PATH_SIZE];
1361 struct stat statbuf;
1364 const char *val = NULL;
1366 if (udev_device == NULL)
1368 if (sysattr == NULL)
1371 /* look for possibly already cached result */
1372 list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
1373 list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
1374 if (list_entry != NULL)
1375 return udev_list_entry_get_value(list_entry);
1377 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1378 if (lstat(path, &statbuf) != 0) {
1379 udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
1383 if (S_ISLNK(statbuf.st_mode)) {
1385 * Some core links return only the last element of the target path,
1386 * these are just values, the paths should not be exposed.
1388 if (streq(sysattr, "driver") ||
1389 streq(sysattr, "subsystem") ||
1390 streq(sysattr, "module")) {
1391 if (util_get_sys_core_link_value(udev_device->udev, sysattr,
1392 udev_device->syspath, value, sizeof(value)) < 0)
1394 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1395 val = udev_list_entry_get_value(list_entry);
1402 /* skip directories */
1403 if (S_ISDIR(statbuf.st_mode))
1406 /* skip non-readable files */
1407 if ((statbuf.st_mode & S_IRUSR) == 0)
1410 /* read attribute value */
1411 fd = open(path, O_RDONLY|O_CLOEXEC);
1414 size = read(fd, value, sizeof(value));
1418 if (size == sizeof(value))
1421 /* got a valid value, store it in cache and return it */
1423 util_remove_trailing_chars(value, '\n');
1424 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1425 val = udev_list_entry_get_value(list_entry);
1431 * udev_device_set_sysattr_value:
1432 * @udev_device: udev device
1433 * @sysattr: attribute name
1434 * @value: new value to be set
1436 * Update the contents of the sys attribute and the cached value of the device.
1438 * Returns: Negative error code on failure or 0 on success.
1440 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
1442 struct udev_device *dev;
1443 char path[UTIL_PATH_SIZE];
1444 struct stat statbuf;
1446 ssize_t size, value_len;
1449 if (udev_device == NULL)
1452 if (sysattr == NULL)
1457 value_len = strlen(value);
1459 strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
1460 if (lstat(path, &statbuf) != 0) {
1461 udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
1466 if (S_ISLNK(statbuf.st_mode)) {
1471 /* skip directories */
1472 if (S_ISDIR(statbuf.st_mode)) {
1477 /* skip non-readable files */
1478 if ((statbuf.st_mode & S_IRUSR) == 0) {
1483 /* Value is limited to 4k */
1484 if (value_len > 4096) {
1488 util_remove_trailing_chars(value, '\n');
1490 /* write attribute value */
1491 fd = open(path, O_WRONLY|O_CLOEXEC);
1496 size = write(fd, value, value_len);
1502 if (size < value_len) {
1507 /* wrote a valid value, store it in cache and return it */
1508 udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
1510 if (dev != udev_device)
1511 udev_device_unref(dev);
1515 static int udev_device_sysattr_list_read(struct udev_device *udev_device)
1517 struct dirent *dent;
1521 if (udev_device == NULL)
1523 if (udev_device->sysattr_list_read)
1526 dir = opendir(udev_device_get_syspath(udev_device));
1530 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1531 char path[UTIL_PATH_SIZE];
1532 struct stat statbuf;
1534 /* only handle symlinks and regular files */
1535 if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
1538 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
1539 if (lstat(path, &statbuf) != 0)
1541 if ((statbuf.st_mode & S_IRUSR) == 0)
1544 udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
1549 udev_device->sysattr_list_read = true;
1555 * udev_device_get_sysattr_list_entry:
1556 * @udev_device: udev device
1558 * Retrieve the list of available sysattrs, with value being empty;
1559 * This just return all available sysfs attributes for a particular
1560 * device without reading their values.
1562 * Returns: the first entry of the property list
1564 _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
1566 if (!udev_device->sysattr_list_read) {
1568 ret = udev_device_sysattr_list_read(udev_device);
1573 return udev_list_get_entry(&udev_device->sysattr_list);
1576 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
1581 free(udev_device->syspath);
1582 udev_device->syspath = strdup(syspath);
1583 if (udev_device->syspath == NULL)
1585 udev_device->devpath = udev_device->syspath + strlen("/sys");
1586 udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
1588 pos = strrchr(udev_device->syspath, '/');
1591 udev_device->sysname = strdup(&pos[1]);
1592 if (udev_device->sysname == NULL)
1595 /* some devices have '!' in their name, change that to '/' */
1597 while (udev_device->sysname[len] != '\0') {
1598 if (udev_device->sysname[len] == '!')
1599 udev_device->sysname[len] = '/';
1603 /* trailing number */
1604 while (len > 0 && isdigit(udev_device->sysname[--len]))
1605 udev_device->sysnum = &udev_device->sysname[len];
1607 /* sysname is completely numeric */
1609 udev_device->sysnum = NULL;
1614 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1616 free(udev_device->devnode);
1617 if (devnode[0] != '/') {
1618 if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
1619 udev_device->devnode = NULL;
1621 udev_device->devnode = strdup(devnode);
1623 if (udev_device->devnode == NULL)
1625 udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1629 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1631 struct udev_list_entry *list_entry;
1633 udev_device->devlinks_uptodate = false;
1634 list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
1635 if (list_entry == NULL)
1640 const char *udev_device_get_id_filename(struct udev_device *udev_device)
1642 if (udev_device->id_filename == NULL) {
1643 if (udev_device_get_subsystem(udev_device) == NULL)
1646 if (major(udev_device_get_devnum(udev_device)) > 0) {
1647 /* use dev_t -- b259:131072, c254:0 */
1648 if (asprintf(&udev_device->id_filename, "%c%u:%u",
1649 streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c',
1650 major(udev_device_get_devnum(udev_device)),
1651 minor(udev_device_get_devnum(udev_device))) < 0)
1652 udev_device->id_filename = NULL;
1653 } else if (udev_device_get_ifindex(udev_device) > 0) {
1654 /* use netdev ifindex -- n3 */
1655 if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0)
1656 udev_device->id_filename = NULL;
1659 * use $subsys:$syname -- pci:0000:00:1f.2
1660 * sysname() has '!' translated, get it from devpath
1662 const char *sysname;
1663 sysname = strrchr(udev_device->devpath, '/');
1664 if (sysname == NULL)
1666 sysname = &sysname[1];
1667 if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
1668 udev_device->id_filename = NULL;
1671 return udev_device->id_filename;
1675 * udev_device_get_is_initialized:
1676 * @udev_device: udev device
1678 * Check if udev has already handled the device and has set up
1679 * device node permissions and context, or has renamed a network
1682 * This is only implemented for devices with a device node
1683 * or network interfaces. All other devices return 1 here.
1685 * Returns: 1 if the device is set up. 0 otherwise.
1687 _public_ int udev_device_get_is_initialized(struct udev_device *udev_device)
1689 if (!udev_device->info_loaded)
1690 udev_device_read_db(udev_device, NULL);
1691 return udev_device->is_initialized;
1694 void udev_device_set_is_initialized(struct udev_device *udev_device)
1696 udev_device->is_initialized = true;
1699 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1701 if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL)
1703 udev_device->tags_uptodate = false;
1704 if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
1709 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1711 udev_device->tags_uptodate = false;
1712 udev_list_cleanup(&udev_device->tags_list);
1716 * udev_device_get_tags_list_entry:
1717 * @udev_device: udev device
1719 * Retrieve the list of tags attached to the udev device. The next
1720 * list entry can be retrieved with udev_list_entry_get_next(),
1721 * which returns #NULL if no more entries exist. The tag string
1722 * can be retrieved from the list entry by udev_list_entry_get_name().
1724 * Returns: the first entry of the tag list
1726 _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1728 if (udev_device == NULL)
1730 if (!udev_device->info_loaded)
1731 udev_device_read_db(udev_device, NULL);
1732 return udev_list_get_entry(&udev_device->tags_list);
1736 * udev_device_has_tag:
1737 * @udev_device: udev device
1740 * Check if a given device has a certain tag associated.
1742 * Returns: 1 if the tag is found. 0 otherwise.
1744 _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1746 struct udev_list_entry *list_entry;
1748 if (udev_device == NULL)
1750 if (!udev_device->info_loaded)
1751 udev_device_read_db(udev_device, NULL);
1752 list_entry = udev_device_get_tags_list_entry(udev_device);
1753 if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
1758 #define ENVP_SIZE 128
1759 #define MONITOR_BUF_SIZE 4096
1760 static int update_envp_monitor_buf(struct udev_device *udev_device)
1762 struct udev_list_entry *list_entry;
1767 /* monitor buffer of property strings */
1768 free(udev_device->monitor_buf);
1769 udev_device->monitor_buf_len = 0;
1770 udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1771 if (udev_device->monitor_buf == NULL)
1774 /* envp array, strings will point into monitor buffer */
1775 if (udev_device->envp == NULL)
1776 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1777 if (udev_device->envp == NULL)
1781 s = udev_device->monitor_buf;
1782 l = MONITOR_BUF_SIZE;
1783 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1786 key = udev_list_entry_get_name(list_entry);
1787 /* skip private variables */
1791 /* add string to envp array */
1792 udev_device->envp[i++] = s;
1793 if (i+1 >= ENVP_SIZE)
1796 /* add property string to monitor buffer */
1797 l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1800 /* advance past the trailing '\0' that strpcpyl() guarantees */
1804 udev_device->envp[i] = NULL;
1805 udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1806 udev_device->envp_uptodate = true;
1810 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1812 if (!udev_device->envp_uptodate)
1813 if (update_envp_monitor_buf(udev_device) != 0)
1815 return udev_device->envp;
1818 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1820 if (!udev_device->envp_uptodate)
1821 if (update_envp_monitor_buf(udev_device) != 0)
1823 *buf = udev_device->monitor_buf;
1824 return udev_device->monitor_buf_len;
1827 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1829 free(udev_device->action);
1830 udev_device->action = strdup(action);
1831 if (udev_device->action == NULL)
1833 udev_device_add_property(udev_device, "ACTION", udev_device->action);
1837 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1839 if (!udev_device->info_loaded)
1840 udev_device_read_db(udev_device, NULL);
1841 return udev_device->devlink_priority;
1844 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1846 udev_device->devlink_priority = prio;
1850 int udev_device_get_watch_handle(struct udev_device *udev_device)
1852 if (!udev_device->info_loaded)
1853 udev_device_read_db(udev_device, NULL);
1854 return udev_device->watch_handle;
1857 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1859 udev_device->watch_handle = handle;
1863 bool udev_device_get_db_persist(struct udev_device *udev_device)
1865 return udev_device->db_persist;
1868 void udev_device_set_db_persist(struct udev_device *udev_device)
1870 udev_device->db_persist = true;