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"
40 * SECTION:libudev-device
41 * @short_description: kernel sys devices
43 * Representation of kernel sys devices. Devices are uniquely identified
44 * by their syspath, every device has exactly one path in the kernel sys
45 * filesystem. Devices usually belong to a kernel subsystem, and and have
46 * a unique name inside that subsystem.
52 * Opaque object representing one kernel sys device.
56 struct udev_device *parent_device;
73 size_t monitor_buf_len;
74 struct udev_list devlinks_list;
75 struct udev_list properties_list;
76 struct udev_list sysattr_value_list;
77 struct udev_list sysattr_list;
78 struct udev_list tags_list;
79 unsigned long long int seqnum;
80 usec_t usec_initialized;
90 bool devlinks_uptodate;
98 bool sysattr_list_read;
103 * udev_device_get_seqnum:
104 * @udev_device: udev device
106 * This is only valid if the device was received through a monitor. Devices read from
107 * sys do not have a sequence number.
109 * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
111 _public_ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
113 if (udev_device == NULL)
115 return udev_device->seqnum;
118 static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
122 udev_device->seqnum = seqnum;
123 snprintf(num, sizeof(num), "%llu", seqnum);
124 udev_device_add_property(udev_device, "SEQNUM", num);
128 int udev_device_get_ifindex(struct udev_device *udev_device)
130 if (!udev_device->info_loaded)
131 udev_device_read_uevent_file(udev_device);
132 return udev_device->ifindex;
135 static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
139 udev_device->ifindex = ifindex;
140 snprintf(num, sizeof(num), "%u", ifindex);
141 udev_device_add_property(udev_device, "IFINDEX", num);
146 * udev_device_get_devnum:
147 * @udev_device: udev device
149 * Get the device major/minor number.
151 * Returns: the dev_t number.
153 _public_ dev_t udev_device_get_devnum(struct udev_device *udev_device)
155 if (udev_device == NULL)
156 return makedev(0, 0);
157 if (!udev_device->info_loaded)
158 udev_device_read_uevent_file(udev_device);
159 return udev_device->devnum;
162 static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
166 udev_device->devnum = devnum;
168 snprintf(num, sizeof(num), "%u", major(devnum));
169 udev_device_add_property(udev_device, "MAJOR", num);
170 snprintf(num, sizeof(num), "%u", minor(devnum));
171 udev_device_add_property(udev_device, "MINOR", num);
175 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
177 return udev_device->devpath_old;
180 static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
184 free(udev_device->devpath_old);
185 udev_device->devpath_old = strdup(devpath_old);
186 if (udev_device->devpath_old == NULL)
188 udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
190 pos = strrchr(udev_device->devpath_old, '/');
197 * udev_device_get_driver:
198 * @udev_device: udev device
200 * Get the kernel driver name.
202 * Returns: the driver name string, or #NULL if there is no driver attached.
204 _public_ const char *udev_device_get_driver(struct udev_device *udev_device)
206 char driver[UTIL_NAME_SIZE];
208 if (udev_device == NULL)
210 if (!udev_device->driver_set) {
211 udev_device->driver_set = true;
212 if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0)
213 udev_device->driver = strdup(driver);
215 return udev_device->driver;
218 static int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
220 free(udev_device->driver);
221 udev_device->driver = strdup(driver);
222 if (udev_device->driver == NULL)
224 udev_device->driver_set = true;
225 udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
230 * udev_device_get_devtype:
231 * @udev_device: udev device
233 * Retrieve the devtype string of the udev device.
235 * Returns: the devtype name of the udev device, or #NULL if it can not be determined
237 _public_ const char *udev_device_get_devtype(struct udev_device *udev_device)
239 if (udev_device == NULL)
241 if (!udev_device->devtype_set) {
242 udev_device->devtype_set = true;
243 udev_device_read_uevent_file(udev_device);
245 return udev_device->devtype;
248 static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
250 free(udev_device->devtype);
251 udev_device->devtype = strdup(devtype);
252 if (udev_device->devtype == NULL)
254 udev_device->devtype_set = true;
255 udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
259 int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
261 free(udev_device->subsystem);
262 udev_device->subsystem = strdup(subsystem);
263 if (udev_device->subsystem == NULL)
265 udev_device->subsystem_set = true;
266 udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
271 * udev_device_get_subsystem:
272 * @udev_device: udev device
274 * Retrieve the subsystem string of the udev device. The string does not
277 * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
279 _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device)
281 char subsystem[UTIL_NAME_SIZE];
283 if (udev_device == NULL)
285 if (!udev_device->subsystem_set) {
286 udev_device->subsystem_set = true;
287 /* read "subsystem" link */
288 if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
289 udev_device_set_subsystem(udev_device, subsystem);
290 return udev_device->subsystem;
293 if (startswith(udev_device->devpath, "/module/")) {
294 udev_device_set_subsystem(udev_device, "module");
295 return udev_device->subsystem;
297 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
298 udev_device_set_subsystem(udev_device, "drivers");
299 return udev_device->subsystem;
301 if (startswith(udev_device->devpath, "/subsystem/") ||
302 startswith(udev_device->devpath, "/class/") ||
303 startswith(udev_device->devpath, "/bus/")) {
304 udev_device_set_subsystem(udev_device, "subsystem");
305 return udev_device->subsystem;
308 return udev_device->subsystem;
311 mode_t udev_device_get_devnode_mode(struct udev_device *udev_device)
313 if (!udev_device->info_loaded)
314 udev_device_read_uevent_file(udev_device);
315 return udev_device->devnode_mode;
318 static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode)
322 udev_device->devnode_mode = mode;
323 snprintf(num, sizeof(num), "%#o", mode);
324 udev_device_add_property(udev_device, "DEVMODE", num);
328 uid_t udev_device_get_devnode_uid(struct udev_device *udev_device)
330 if (!udev_device->info_loaded)
331 udev_device_read_uevent_file(udev_device);
332 return udev_device->devnode_uid;
335 static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid)
339 udev_device->devnode_uid = uid;
340 snprintf(num, sizeof(num), "%u", uid);
341 udev_device_add_property(udev_device, "DEVUID", num);
345 gid_t udev_device_get_devnode_gid(struct udev_device *udev_device)
347 if (!udev_device->info_loaded)
348 udev_device_read_uevent_file(udev_device);
349 return udev_device->devnode_gid;
352 static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid)
356 udev_device->devnode_gid = gid;
357 snprintf(num, sizeof(num), "%u", gid);
358 udev_device_add_property(udev_device, "DEVGID", num);
362 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
364 udev_device->envp_uptodate = false;
366 struct udev_list_entry *list_entry;
368 list_entry = udev_device_get_properties_list_entry(udev_device);
369 list_entry = udev_list_entry_get_by_name(list_entry, key);
370 if (list_entry != NULL)
371 udev_list_entry_delete(list_entry);
374 return udev_list_entry_add(&udev_device->properties_list, key, value);
377 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
379 char name[UTIL_LINE_SIZE];
382 strscpy(name, sizeof(name), property);
383 val = strchr(name, '=');
390 return udev_device_add_property(udev_device, name, val);
394 * parse property string, and if needed, update internal values accordingly
396 * udev_device_add_property_from_string_parse_finish() needs to be
397 * called after adding properties, and its return value checked
399 * udev_device_set_info_loaded() needs to be set, to avoid trying
400 * to use a device without a DEVPATH set
402 void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
404 if (startswith(property, "DEVPATH=")) {
405 char path[UTIL_PATH_SIZE];
407 strscpyl(path, sizeof(path), "/sys", &property[8], NULL);
408 udev_device_set_syspath(udev_device, path);
409 } else if (startswith(property, "SUBSYSTEM=")) {
410 udev_device_set_subsystem(udev_device, &property[10]);
411 } else if (startswith(property, "DEVTYPE=")) {
412 udev_device_set_devtype(udev_device, &property[8]);
413 } else if (startswith(property, "DEVNAME=")) {
414 udev_device_set_devnode(udev_device, &property[8]);
415 } else if (startswith(property, "DEVLINKS=")) {
416 char devlinks[UTIL_PATH_SIZE];
420 strscpy(devlinks, sizeof(devlinks), &property[9]);
422 next = strchr(slink, ' ');
423 while (next != NULL) {
425 udev_device_add_devlink(udev_device, slink);
427 next = strchr(slink, ' ');
429 if (slink[0] != '\0')
430 udev_device_add_devlink(udev_device, slink);
431 } else if (startswith(property, "TAGS=")) {
432 char tags[UTIL_PATH_SIZE];
435 strscpy(tags, sizeof(tags), &property[5]);
436 next = strchr(tags, ':');
439 while (next[0] != '\0') {
443 next = strchr(tag, ':');
448 udev_device_add_tag(udev_device, tag);
451 } else if (startswith(property, "USEC_INITIALIZED=")) {
452 udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
453 } else if (startswith(property, "DRIVER=")) {
454 udev_device_set_driver(udev_device, &property[7]);
455 } else if (startswith(property, "ACTION=")) {
456 udev_device_set_action(udev_device, &property[7]);
457 } else if (startswith(property, "MAJOR=")) {
458 udev_device->maj = strtoull(&property[6], NULL, 10);
459 } else if (startswith(property, "MINOR=")) {
460 udev_device->min = strtoull(&property[6], NULL, 10);
461 } else if (startswith(property, "DEVPATH_OLD=")) {
462 udev_device_set_devpath_old(udev_device, &property[12]);
463 } else if (startswith(property, "SEQNUM=")) {
464 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
465 } else if (startswith(property, "IFINDEX=")) {
466 udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
467 } else if (startswith(property, "DEVMODE=")) {
468 udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
469 } else if (startswith(property, "DEVUID=")) {
470 udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10));
471 } else if (startswith(property, "DEVGID=")) {
472 udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10));
474 udev_device_add_property_from_string(udev_device, property);
478 int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
480 if (udev_device->maj > 0)
481 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
482 udev_device->maj = 0;
483 udev_device->min = 0;
485 if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
491 * udev_device_get_property_value:
492 * @udev_device: udev device
493 * @key: property name
495 * Get the value of a given property.
497 * Returns: the property string, or #NULL if there is no such property.
499 _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
501 struct udev_list_entry *list_entry;
503 if (udev_device == NULL)
508 list_entry = udev_device_get_properties_list_entry(udev_device);
509 list_entry = udev_list_entry_get_by_name(list_entry, key);
510 return udev_list_entry_get_value(list_entry);
513 int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
515 char filename[UTIL_PATH_SIZE];
516 char line[UTIL_LINE_SIZE];
519 /* providing a database file will always force-load it */
520 if (dbfile == NULL) {
523 if (udev_device->db_loaded)
525 udev_device->db_loaded = true;
527 id = udev_device_get_id_filename(udev_device);
530 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
534 f = fopen(dbfile, "re");
536 udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile);
539 udev_device->is_initialized = true;
541 while (fgets(line, sizeof(line), f)) {
544 struct udev_list_entry *entry;
553 strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
554 udev_device_add_devlink(udev_device, filename);
557 udev_device_set_devlink_priority(udev_device, atoi(val));
560 entry = udev_device_add_property_from_string(udev_device, val);
561 udev_list_entry_set_num(entry, true);
564 udev_device_add_tag(udev_device, val);
567 udev_device_set_watch_handle(udev_device, atoi(val));
570 udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
576 udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device);
580 int udev_device_read_uevent_file(struct udev_device *udev_device)
582 char filename[UTIL_PATH_SIZE];
584 char line[UTIL_LINE_SIZE];
588 if (udev_device->uevent_loaded)
591 strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
592 f = fopen(filename, "re");
595 udev_device->uevent_loaded = true;
597 while (fgets(line, sizeof(line), f)) {
600 pos = strchr(line, '\n');
605 if (startswith(line, "DEVTYPE=")) {
606 udev_device_set_devtype(udev_device, &line[8]);
609 if (startswith(line, "IFINDEX=")) {
610 udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
613 if (startswith(line, "DEVNAME=")) {
614 udev_device_set_devnode(udev_device, &line[8]);
618 if (startswith(line, "MAJOR="))
619 maj = strtoull(&line[6], NULL, 10);
620 else if (startswith(line, "MINOR="))
621 min = strtoull(&line[6], NULL, 10);
622 else if (startswith(line, "DEVMODE="))
623 udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
625 udev_device_add_property_from_string(udev_device, line);
628 udev_device->devnum = makedev(maj, min);
633 void udev_device_set_info_loaded(struct udev_device *device)
635 device->info_loaded = true;
638 struct udev_device *udev_device_new(struct udev *udev)
640 struct udev_device *udev_device;
641 struct udev_list_entry *list_entry;
646 udev_device = calloc(1, sizeof(struct udev_device));
647 if (udev_device == NULL)
649 udev_device->refcount = 1;
650 udev_device->udev = udev;
651 udev_list_init(udev, &udev_device->devlinks_list, true);
652 udev_list_init(udev, &udev_device->properties_list, true);
653 udev_list_init(udev, &udev_device->sysattr_value_list, true);
654 udev_list_init(udev, &udev_device->sysattr_list, false);
655 udev_list_init(udev, &udev_device->tags_list, true);
656 udev_device->watch_handle = -1;
657 /* copy global properties */
658 udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
659 udev_device_add_property(udev_device,
660 udev_list_entry_get_name(list_entry),
661 udev_list_entry_get_value(list_entry));
666 * udev_device_new_from_syspath:
667 * @udev: udev library context
668 * @syspath: sys device path including sys directory
670 * Create new udev device, and fill in information from the sys
671 * device and the udev database entry. The syspath is the absolute
672 * path to the device, including the sys mount point.
674 * The initial refcount is 1, and needs to be decremented to
675 * release the resources of the udev device.
677 * Returns: a new udev device, or #NULL, if it does not exist
679 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
682 char path[UTIL_PATH_SIZE];
685 struct udev_device *udev_device;
692 /* path starts in sys */
693 if (!startswith(syspath, "/sys")) {
694 udev_dbg(udev, "not in sys :%s\n", syspath);
698 /* path is not a root directory */
699 subdir = syspath + strlen("/sys");
700 pos = strrchr(subdir, '/');
701 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2])
704 /* resolve possible symlink to real path */
705 strscpy(path, sizeof(path), syspath);
706 util_resolve_sys_link(udev, path, sizeof(path));
708 if (startswith(path + strlen("/sys"), "/devices/")) {
709 char file[UTIL_PATH_SIZE];
711 /* all "devices" require a "uevent" file */
712 strscpyl(file, sizeof(file), path, "/uevent", NULL);
713 if (stat(file, &statbuf) != 0)
716 /* everything else just needs to be a directory */
717 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
721 udev_device = udev_device_new(udev);
722 if (udev_device == NULL)
725 udev_device_set_syspath(udev_device, path);
726 udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
732 * udev_device_new_from_devnum:
733 * @udev: udev library context
734 * @type: char or block device
735 * @devnum: device major/minor number
737 * Create new udev device, and fill in information from the sys
738 * device and the udev database entry. The device is looked-up
739 * by its major/minor number and type. Character and block device
740 * numbers are not unique across the two types.
742 * The initial refcount is 1, and needs to be decremented to
743 * release the resources of the udev device.
745 * Returns: a new udev device, or #NULL, if it does not exist
747 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
749 char path[UTIL_PATH_SIZE];
750 const char *type_str;
754 else if (type == 'c')
759 /* use /sys/dev/{block,char}/<maj>:<min> link */
760 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
761 type_str, major(devnum), minor(devnum));
762 return udev_device_new_from_syspath(udev, path);
766 * udev_device_new_from_device_id:
767 * @udev: udev library context
768 * @id: text string identifying a kernel device
770 * Create new udev device, and fill in information from the sys
771 * device and the udev database entry. The device is looked-up
772 * by a special string:
773 * b8:2 - block device major:minor
774 * c128:1 - char device major:minor
775 * n3 - network device ifindex
776 * +sound:card29 - kernel driver core subsystem:device name
778 * The initial refcount is 1, and needs to be decremented to
779 * release the resources of the udev device.
781 * Returns: a new udev device, or #NULL, if it does not exist
783 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, char *id)
787 char subsys[UTIL_PATH_SIZE];
793 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
795 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
799 struct udev_device *dev;
802 ifindex = strtoul(&id[1], NULL, 10);
806 sk = socket(PF_INET, SOCK_DGRAM, 0);
809 memset(&ifr, 0x00, sizeof(struct ifreq));
810 ifr.ifr_ifindex = ifindex;
811 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
817 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
820 if (udev_device_get_ifindex(dev) == ifindex)
822 udev_device_unref(dev);
826 strscpy(subsys, sizeof(subsys), &id[1]);
827 sysname = strchr(subsys, ':');
831 sysname = &sysname[1];
832 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
839 * udev_device_new_from_subsystem_sysname:
840 * @udev: udev library context
841 * @subsystem: the subsystem of the device
842 * @sysname: the name of the device
844 * Create new udev device, and fill in information from the sys device
845 * and the udev database entry. The device is looked up by the subsystem
846 * and name string of the device, like "mem" / "zero", or "block" / "sda".
848 * The initial refcount is 1, and needs to be decremented to
849 * release the resources of the udev device.
851 * Returns: a new udev device, or #NULL, if it does not exist
853 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
855 char path[UTIL_PATH_SIZE];
858 if (streq(subsystem, "subsystem")) {
859 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
860 if (stat(path, &statbuf) == 0)
863 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
864 if (stat(path, &statbuf) == 0)
867 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
868 if (stat(path, &statbuf) == 0)
873 if (streq(subsystem, "module")) {
874 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
875 if (stat(path, &statbuf) == 0)
880 if (streq(subsystem, "drivers")) {
881 char subsys[UTIL_NAME_SIZE];
884 strscpy(subsys, sizeof(subsys), sysname);
885 driver = strchr(subsys, ':');
886 if (driver != NULL) {
890 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
891 if (stat(path, &statbuf) == 0)
894 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
895 if (stat(path, &statbuf) == 0)
901 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
902 if (stat(path, &statbuf) == 0)
905 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
906 if (stat(path, &statbuf) == 0)
909 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
910 if (stat(path, &statbuf) == 0)
915 return udev_device_new_from_syspath(udev, path);
919 * udev_device_new_from_environment
920 * @udev: udev library context
922 * Create new udev device, and fill in information from the
923 * current process environment. This only works reliable if
924 * the process is called from a udev rule. It is usually used
925 * for tools executed from IMPORT= rules.
927 * The initial refcount is 1, and needs to be decremented to
928 * release the resources of the udev device.
930 * Returns: a new udev device, or #NULL, if it does not exist
932 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
935 struct udev_device *udev_device;
937 udev_device = udev_device_new(udev);
938 if (udev_device == NULL)
940 udev_device_set_info_loaded(udev_device);
942 for (i = 0; environ[i] != NULL; i++)
943 udev_device_add_property_from_string_parse(udev_device, environ[i]);
945 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
946 udev_dbg(udev, "missing values, invalid device\n");
947 udev_device_unref(udev_device);
954 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
956 struct udev_device *udev_device_parent = NULL;
957 char path[UTIL_PATH_SIZE];
960 strscpy(path, sizeof(path), udev_device->syspath);
961 subdir = path + strlen("/sys/");
965 pos = strrchr(subdir, '/');
966 if (pos == NULL || pos < &subdir[2])
969 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
970 if (udev_device_parent != NULL)
971 return udev_device_parent;
977 * udev_device_get_parent:
978 * @udev_device: the device to start searching from
980 * Find the next parent device, and fill in information from the sys
981 * device and the udev database entry.
983 * The returned the device is not referenced. It is attached to the
984 * child device, and will be cleaned up when the child device
987 * It is not necessarily just the upper level directory, empty or not
988 * recognized sys directories are ignored.
990 * It can be called as many times as needed, without caring about
993 * Returns: a new udev device, or #NULL, if it no parent exist.
995 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
997 if (udev_device == NULL)
999 if (!udev_device->parent_set) {
1000 udev_device->parent_set = true;
1001 udev_device->parent_device = device_new_from_parent(udev_device);
1003 return udev_device->parent_device;
1007 * udev_device_get_parent_with_subsystem_devtype:
1008 * @udev_device: udev device to start searching from
1009 * @subsystem: the subsystem of the device
1010 * @devtype: the type (DEVTYPE) of the device
1012 * Find the next parent device, with a matching subsystem and devtype
1013 * value, and fill in information from the sys device and the udev
1016 * If devtype is #NULL, only subsystem is checked, and any devtype will
1019 * The returned the device is not referenced. It is attached to the
1020 * child device, and will be cleaned up when the child device
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.
1091 * Returns: the passed udev device if it has still an active reference, or #NULL otherwise.
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 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;