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);
542 /* devices with a database entry are initialized */
543 udev_device->is_initialized = true;
545 while (fgets(line, sizeof(line), f)) {
548 struct udev_list_entry *entry;
557 strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
558 udev_device_add_devlink(udev_device, filename);
561 udev_device_set_devlink_priority(udev_device, atoi(val));
564 entry = udev_device_add_property_from_string(udev_device, val);
565 udev_list_entry_set_num(entry, true);
568 udev_device_add_tag(udev_device, val);
571 udev_device_set_watch_handle(udev_device, atoi(val));
574 udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
580 udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device);
584 int udev_device_read_uevent_file(struct udev_device *udev_device)
586 char filename[UTIL_PATH_SIZE];
588 char line[UTIL_LINE_SIZE];
592 if (udev_device->uevent_loaded)
595 strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
596 f = fopen(filename, "re");
599 udev_device->uevent_loaded = true;
601 while (fgets(line, sizeof(line), f)) {
604 pos = strchr(line, '\n');
609 if (startswith(line, "DEVTYPE=")) {
610 udev_device_set_devtype(udev_device, &line[8]);
613 if (startswith(line, "IFINDEX=")) {
614 udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
617 if (startswith(line, "DEVNAME=")) {
618 udev_device_set_devnode(udev_device, &line[8]);
622 if (startswith(line, "MAJOR="))
623 maj = strtoull(&line[6], NULL, 10);
624 else if (startswith(line, "MINOR="))
625 min = strtoull(&line[6], NULL, 10);
626 else if (startswith(line, "DEVMODE="))
627 udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
629 udev_device_add_property_from_string(udev_device, line);
632 udev_device->devnum = makedev(maj, min);
637 void udev_device_set_info_loaded(struct udev_device *device)
639 device->info_loaded = true;
642 struct udev_device *udev_device_new(struct udev *udev)
644 struct udev_device *udev_device;
645 struct udev_list_entry *list_entry;
650 udev_device = new0(struct udev_device, 1);
651 if (udev_device == NULL)
653 udev_device->refcount = 1;
654 udev_device->udev = udev;
655 udev_list_init(udev, &udev_device->devlinks_list, true);
656 udev_list_init(udev, &udev_device->properties_list, true);
657 udev_list_init(udev, &udev_device->sysattr_value_list, true);
658 udev_list_init(udev, &udev_device->sysattr_list, false);
659 udev_list_init(udev, &udev_device->tags_list, true);
660 udev_device->watch_handle = -1;
661 /* copy global properties */
662 udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
663 udev_device_add_property(udev_device,
664 udev_list_entry_get_name(list_entry),
665 udev_list_entry_get_value(list_entry));
670 * udev_device_new_from_syspath:
671 * @udev: udev library context
672 * @syspath: sys device path including sys directory
674 * Create new udev device, and fill in information from the sys
675 * device and the udev database entry. The syspath is the absolute
676 * path to the device, including the sys mount point.
678 * The initial refcount is 1, and needs to be decremented to
679 * release the resources of the udev device.
681 * Returns: a new udev device, or #NULL, if it does not exist
683 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
686 char path[UTIL_PATH_SIZE];
689 struct udev_device *udev_device;
696 /* path starts in sys */
697 if (!startswith(syspath, "/sys")) {
698 udev_dbg(udev, "not in sys :%s\n", syspath);
702 /* path is not a root directory */
703 subdir = syspath + strlen("/sys");
704 pos = strrchr(subdir, '/');
705 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2])
708 /* resolve possible symlink to real path */
709 strscpy(path, sizeof(path), syspath);
710 util_resolve_sys_link(udev, path, sizeof(path));
712 if (startswith(path + strlen("/sys"), "/devices/")) {
713 char file[UTIL_PATH_SIZE];
715 /* all "devices" require a "uevent" file */
716 strscpyl(file, sizeof(file), path, "/uevent", NULL);
717 if (stat(file, &statbuf) != 0)
720 /* everything else just needs to be a directory */
721 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
725 udev_device = udev_device_new(udev);
726 if (udev_device == NULL)
729 udev_device_set_syspath(udev_device, path);
730 udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
736 * udev_device_new_from_devnum:
737 * @udev: udev library context
738 * @type: char or block device
739 * @devnum: device major/minor number
741 * Create new udev device, and fill in information from the sys
742 * device and the udev database entry. The device is looked-up
743 * by its major/minor number and type. Character and block device
744 * numbers are not unique across the two types.
746 * The initial refcount is 1, and needs to be decremented to
747 * release the resources of the udev device.
749 * Returns: a new udev device, or #NULL, if it does not exist
751 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
753 char path[UTIL_PATH_SIZE];
754 const char *type_str;
758 else if (type == 'c')
763 /* use /sys/dev/{block,char}/<maj>:<min> link */
764 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
765 type_str, major(devnum), minor(devnum));
766 return udev_device_new_from_syspath(udev, path);
770 * udev_device_new_from_device_id:
771 * @udev: udev library context
772 * @id: text string identifying a kernel device
774 * Create new udev device, and fill in information from the sys
775 * device and the udev database entry. The device is looked-up
776 * by a special string:
777 * b8:2 - block device major:minor
778 * c128:1 - char device major:minor
779 * n3 - network device ifindex
780 * +sound:card29 - kernel driver core subsystem:device name
782 * The initial refcount is 1, and needs to be decremented to
783 * release the resources of the udev device.
785 * Returns: a new udev device, or #NULL, if it does not exist
787 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
791 char subsys[UTIL_PATH_SIZE];
797 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
799 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
803 struct udev_device *dev;
806 ifindex = strtoul(&id[1], NULL, 10);
810 sk = socket(PF_INET, SOCK_DGRAM, 0);
813 memzero(&ifr, sizeof(struct ifreq));
814 ifr.ifr_ifindex = ifindex;
815 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
821 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
824 if (udev_device_get_ifindex(dev) == ifindex)
826 udev_device_unref(dev);
830 strscpy(subsys, sizeof(subsys), &id[1]);
831 sysname = strchr(subsys, ':');
835 sysname = &sysname[1];
836 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
843 * udev_device_new_from_subsystem_sysname:
844 * @udev: udev library context
845 * @subsystem: the subsystem of the device
846 * @sysname: the name of the device
848 * Create new udev device, and fill in information from the sys device
849 * and the udev database entry. The device is looked up by the subsystem
850 * and name string of the device, like "mem" / "zero", or "block" / "sda".
852 * The initial refcount is 1, and needs to be decremented to
853 * release the resources of the udev device.
855 * Returns: a new udev device, or #NULL, if it does not exist
857 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
859 char path[UTIL_PATH_SIZE];
862 if (streq(subsystem, "subsystem")) {
863 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
864 if (stat(path, &statbuf) == 0)
867 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
868 if (stat(path, &statbuf) == 0)
871 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
872 if (stat(path, &statbuf) == 0)
877 if (streq(subsystem, "module")) {
878 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
879 if (stat(path, &statbuf) == 0)
884 if (streq(subsystem, "drivers")) {
885 char subsys[UTIL_NAME_SIZE];
888 strscpy(subsys, sizeof(subsys), sysname);
889 driver = strchr(subsys, ':');
890 if (driver != NULL) {
894 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
895 if (stat(path, &statbuf) == 0)
898 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
899 if (stat(path, &statbuf) == 0)
905 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
906 if (stat(path, &statbuf) == 0)
909 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
910 if (stat(path, &statbuf) == 0)
913 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
914 if (stat(path, &statbuf) == 0)
919 return udev_device_new_from_syspath(udev, path);
923 * udev_device_new_from_environment
924 * @udev: udev library context
926 * Create new udev device, and fill in information from the
927 * current process environment. This only works reliable if
928 * the process is called from a udev rule. It is usually used
929 * for tools executed from IMPORT= rules.
931 * The initial refcount is 1, and needs to be decremented to
932 * release the resources of the udev device.
934 * Returns: a new udev device, or #NULL, if it does not exist
936 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
939 struct udev_device *udev_device;
941 udev_device = udev_device_new(udev);
942 if (udev_device == NULL)
944 udev_device_set_info_loaded(udev_device);
946 for (i = 0; environ[i] != NULL; i++)
947 udev_device_add_property_from_string_parse(udev_device, environ[i]);
949 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
950 udev_dbg(udev, "missing values, invalid device\n");
951 udev_device_unref(udev_device);
958 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
960 struct udev_device *udev_device_parent = NULL;
961 char path[UTIL_PATH_SIZE];
964 strscpy(path, sizeof(path), udev_device->syspath);
965 subdir = path + strlen("/sys/");
969 pos = strrchr(subdir, '/');
970 if (pos == NULL || pos < &subdir[2])
973 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
974 if (udev_device_parent != NULL)
975 return udev_device_parent;
981 * udev_device_get_parent:
982 * @udev_device: the device to start searching from
984 * Find the next parent device, and fill in information from the sys
985 * device and the udev database entry.
987 * Returned device is not referenced. It is attached to the child
988 * device, and will be cleaned up when the child device is cleaned up.
990 * It is not necessarily just the upper level directory, empty or not
991 * recognized sys directories are ignored.
993 * It can be called as many times as needed, without caring about
996 * Returns: a new udev device, or #NULL, if it no parent exist.
998 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
1000 if (udev_device == NULL)
1002 if (!udev_device->parent_set) {
1003 udev_device->parent_set = true;
1004 udev_device->parent_device = device_new_from_parent(udev_device);
1006 return udev_device->parent_device;
1010 * udev_device_get_parent_with_subsystem_devtype:
1011 * @udev_device: udev device to start searching from
1012 * @subsystem: the subsystem of the device
1013 * @devtype: the type (DEVTYPE) of the device
1015 * Find the next parent device, with a matching subsystem and devtype
1016 * value, and fill in information from the sys device and the udev
1019 * If devtype is #NULL, only subsystem is checked, and any devtype will
1022 * Returned device is not referenced. It is attached to the child
1023 * device, and will be cleaned up when the child device is cleaned up.
1025 * It can be called as many times as needed, without caring about
1028 * Returns: a new udev device, or #NULL if no matching parent exists.
1030 _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
1032 struct udev_device *parent;
1034 if (subsystem == NULL)
1037 parent = udev_device_get_parent(udev_device);
1038 while (parent != NULL) {
1039 const char *parent_subsystem;
1040 const char *parent_devtype;
1042 parent_subsystem = udev_device_get_subsystem(parent);
1043 if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
1044 if (devtype == NULL)
1046 parent_devtype = udev_device_get_devtype(parent);
1047 if (parent_devtype != NULL && streq(parent_devtype, devtype))
1050 parent = udev_device_get_parent(parent);
1056 * udev_device_get_udev:
1057 * @udev_device: udev device
1059 * Retrieve the udev library context the device was created with.
1061 * Returns: the udev library context
1063 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
1065 if (udev_device == NULL)
1067 return udev_device->udev;
1072 * @udev_device: udev device
1074 * Take a reference of a udev device.
1076 * Returns: the passed udev device
1078 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
1080 if (udev_device == NULL)
1082 udev_device->refcount++;
1087 * udev_device_unref:
1088 * @udev_device: udev device
1090 * Drop a reference of a udev device. If the refcount reaches zero,
1091 * the resources of the device will be released.
1095 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
1097 if (udev_device == NULL)
1099 udev_device->refcount--;
1100 if (udev_device->refcount > 0)
1102 if (udev_device->parent_device != NULL)
1103 udev_device_unref(udev_device->parent_device);
1104 free(udev_device->syspath);
1105 free(udev_device->sysname);
1106 free(udev_device->devnode);
1107 free(udev_device->subsystem);
1108 free(udev_device->devtype);
1109 udev_list_cleanup(&udev_device->devlinks_list);
1110 udev_list_cleanup(&udev_device->properties_list);
1111 udev_list_cleanup(&udev_device->sysattr_value_list);
1112 udev_list_cleanup(&udev_device->sysattr_list);
1113 udev_list_cleanup(&udev_device->tags_list);
1114 free(udev_device->action);
1115 free(udev_device->driver);
1116 free(udev_device->devpath_old);
1117 free(udev_device->id_filename);
1118 free(udev_device->envp);
1119 free(udev_device->monitor_buf);
1125 * udev_device_get_devpath:
1126 * @udev_device: udev device
1128 * Retrieve the kernel devpath value of the udev device. The path
1129 * does not contain the sys mount point, and starts with a '/'.
1131 * Returns: the devpath of the udev device
1133 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
1135 if (udev_device == NULL)
1137 return udev_device->devpath;
1141 * udev_device_get_syspath:
1142 * @udev_device: udev device
1144 * Retrieve the sys path of the udev device. The path is an
1145 * absolute path and starts with the sys mount point.
1147 * Returns: the sys path of the udev device
1149 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
1151 if (udev_device == NULL)
1153 return udev_device->syspath;
1157 * udev_device_get_sysname:
1158 * @udev_device: udev device
1160 * Get the kernel device name in /sys.
1162 * Returns: the name string of the device device
1164 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
1166 if (udev_device == NULL)
1168 return udev_device->sysname;
1172 * udev_device_get_sysnum:
1173 * @udev_device: udev device
1175 * Get the instance number of the device.
1177 * Returns: the trailing number string of the device name
1179 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
1181 if (udev_device == NULL)
1183 return udev_device->sysnum;
1187 * udev_device_get_devnode:
1188 * @udev_device: udev device
1190 * Retrieve the device node file name belonging to the udev device.
1191 * The path is an absolute path, and starts with the device directory.
1193 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1195 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
1197 if (udev_device == NULL)
1199 if (udev_device->devnode != NULL)
1200 return udev_device->devnode;
1201 if (!udev_device->info_loaded)
1202 udev_device_read_uevent_file(udev_device);
1203 return udev_device->devnode;
1207 * udev_device_get_devlinks_list_entry:
1208 * @udev_device: udev device
1210 * Retrieve the list of device links pointing to the device file of
1211 * the udev device. The next list entry can be retrieved with
1212 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1213 * The devlink path can be retrieved from the list entry by
1214 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1215 * the device directory.
1217 * Returns: the first entry of the device node link list
1219 _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
1221 if (udev_device == NULL)
1223 if (!udev_device->info_loaded)
1224 udev_device_read_db(udev_device, NULL);
1225 return udev_list_get_entry(&udev_device->devlinks_list);
1228 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
1230 udev_device->devlinks_uptodate = false;
1231 udev_list_cleanup(&udev_device->devlinks_list);
1235 * udev_device_get_properties_list_entry:
1236 * @udev_device: udev device
1238 * Retrieve the list of key/value device properties of the udev
1239 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1240 * which returns #NULL if no more entries exist. The property name
1241 * can be retrieved from the list entry by udev_list_entry_get_name(),
1242 * the property value by udev_list_entry_get_value().
1244 * Returns: the first entry of the property list
1246 _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
1248 if (udev_device == NULL)
1250 if (!udev_device->info_loaded) {
1251 udev_device_read_uevent_file(udev_device);
1252 udev_device_read_db(udev_device, NULL);
1254 if (!udev_device->devlinks_uptodate) {
1255 char symlinks[UTIL_PATH_SIZE];
1256 struct udev_list_entry *list_entry;
1258 udev_device->devlinks_uptodate = true;
1259 list_entry = udev_device_get_devlinks_list_entry(udev_device);
1260 if (list_entry != NULL) {
1265 l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
1266 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
1267 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1268 udev_device_add_property(udev_device, "DEVLINKS", symlinks);
1271 if (!udev_device->tags_uptodate) {
1272 udev_device->tags_uptodate = true;
1273 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1274 char tags[UTIL_PATH_SIZE];
1275 struct udev_list_entry *list_entry;
1280 l = strpcpyl(&s, sizeof(tags), ":", NULL);
1281 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1282 l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1283 udev_device_add_property(udev_device, "TAGS", tags);
1286 return udev_list_get_entry(&udev_device->properties_list);
1290 * udev_device_get_action:
1291 * @udev_device: udev device
1293 * This is only valid if the device was received through a monitor. Devices read from
1294 * sys do not have an action string. Usual actions are: add, remove, change, online,
1297 * Returns: the kernel action value, or #NULL if there is no action value available.
1299 _public_ const char *udev_device_get_action(struct udev_device *udev_device)
1301 if (udev_device == NULL)
1303 return udev_device->action;
1307 * udev_device_get_usec_since_initialized:
1308 * @udev_device: udev device
1310 * Return the number of microseconds passed since udev set up the
1311 * device for the first time.
1313 * This is only implemented for devices with need to store properties
1314 * in the udev database. All other devices return 0 here.
1316 * Returns: the number of microseconds since the device was first seen.
1318 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
1322 if (udev_device == NULL)
1324 if (!udev_device->info_loaded)
1325 udev_device_read_db(udev_device, NULL);
1326 if (udev_device->usec_initialized == 0)
1328 now_ts = now(CLOCK_MONOTONIC);
1331 return now_ts - udev_device->usec_initialized;
1334 usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
1336 return udev_device->usec_initialized;
1339 void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
1343 udev_device->usec_initialized = usec_initialized;
1344 snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
1345 udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
1349 * udev_device_get_sysattr_value:
1350 * @udev_device: udev device
1351 * @sysattr: attribute name
1353 * The retrieved value is cached in the device. Repeated calls will return the same
1354 * value and not open the attribute again.
1356 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1358 _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1360 struct udev_list_entry *list_entry;
1361 char path[UTIL_PATH_SIZE];
1363 struct stat statbuf;
1366 const char *val = NULL;
1368 if (udev_device == NULL)
1370 if (sysattr == NULL)
1373 /* look for possibly already cached result */
1374 list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
1375 list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
1376 if (list_entry != NULL)
1377 return udev_list_entry_get_value(list_entry);
1379 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1380 if (lstat(path, &statbuf) != 0) {
1381 udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
1385 if (S_ISLNK(statbuf.st_mode)) {
1387 * Some core links return only the last element of the target path,
1388 * these are just values, the paths should not be exposed.
1390 if (streq(sysattr, "driver") ||
1391 streq(sysattr, "subsystem") ||
1392 streq(sysattr, "module")) {
1393 if (util_get_sys_core_link_value(udev_device->udev, sysattr,
1394 udev_device->syspath, value, sizeof(value)) < 0)
1396 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1397 val = udev_list_entry_get_value(list_entry);
1404 /* skip directories */
1405 if (S_ISDIR(statbuf.st_mode))
1408 /* skip non-readable files */
1409 if ((statbuf.st_mode & S_IRUSR) == 0)
1412 /* read attribute value */
1413 fd = open(path, O_RDONLY|O_CLOEXEC);
1416 size = read(fd, value, sizeof(value));
1420 if (size == sizeof(value))
1423 /* got a valid value, store it in cache and return it */
1425 util_remove_trailing_chars(value, '\n');
1426 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1427 val = udev_list_entry_get_value(list_entry);
1433 * udev_device_set_sysattr_value:
1434 * @udev_device: udev device
1435 * @sysattr: attribute name
1436 * @value: new value to be set
1438 * Update the contents of the sys attribute and the cached value of the device.
1440 * Returns: Negative error code on failure or 0 on success.
1442 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
1444 struct udev_device *dev;
1445 char path[UTIL_PATH_SIZE];
1446 struct stat statbuf;
1448 ssize_t size, value_len;
1451 if (udev_device == NULL)
1454 if (sysattr == NULL)
1459 value_len = strlen(value);
1461 strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
1462 if (lstat(path, &statbuf) != 0) {
1463 udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
1468 if (S_ISLNK(statbuf.st_mode)) {
1473 /* skip directories */
1474 if (S_ISDIR(statbuf.st_mode)) {
1479 /* skip non-readable files */
1480 if ((statbuf.st_mode & S_IRUSR) == 0) {
1485 /* Value is limited to 4k */
1486 if (value_len > 4096) {
1490 util_remove_trailing_chars(value, '\n');
1492 /* write attribute value */
1493 fd = open(path, O_WRONLY|O_CLOEXEC);
1498 size = write(fd, value, value_len);
1504 if (size < value_len) {
1509 /* wrote a valid value, store it in cache and return it */
1510 udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
1512 if (dev != udev_device)
1513 udev_device_unref(dev);
1517 static int udev_device_sysattr_list_read(struct udev_device *udev_device)
1519 struct dirent *dent;
1523 if (udev_device == NULL)
1525 if (udev_device->sysattr_list_read)
1528 dir = opendir(udev_device_get_syspath(udev_device));
1532 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1533 char path[UTIL_PATH_SIZE];
1534 struct stat statbuf;
1536 /* only handle symlinks and regular files */
1537 if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
1540 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
1541 if (lstat(path, &statbuf) != 0)
1543 if ((statbuf.st_mode & S_IRUSR) == 0)
1546 udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
1551 udev_device->sysattr_list_read = true;
1557 * udev_device_get_sysattr_list_entry:
1558 * @udev_device: udev device
1560 * Retrieve the list of available sysattrs, with value being empty;
1561 * This just return all available sysfs attributes for a particular
1562 * device without reading their values.
1564 * Returns: the first entry of the property list
1566 _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
1568 if (!udev_device->sysattr_list_read) {
1570 ret = udev_device_sysattr_list_read(udev_device);
1575 return udev_list_get_entry(&udev_device->sysattr_list);
1578 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
1583 free(udev_device->syspath);
1584 udev_device->syspath = strdup(syspath);
1585 if (udev_device->syspath == NULL)
1587 udev_device->devpath = udev_device->syspath + strlen("/sys");
1588 udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
1590 pos = strrchr(udev_device->syspath, '/');
1593 udev_device->sysname = strdup(&pos[1]);
1594 if (udev_device->sysname == NULL)
1597 /* some devices have '!' in their name, change that to '/' */
1599 while (udev_device->sysname[len] != '\0') {
1600 if (udev_device->sysname[len] == '!')
1601 udev_device->sysname[len] = '/';
1605 /* trailing number */
1606 while (len > 0 && isdigit(udev_device->sysname[--len]))
1607 udev_device->sysnum = &udev_device->sysname[len];
1609 /* sysname is completely numeric */
1611 udev_device->sysnum = NULL;
1616 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1618 free(udev_device->devnode);
1619 if (devnode[0] != '/') {
1620 if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
1621 udev_device->devnode = NULL;
1623 udev_device->devnode = strdup(devnode);
1625 if (udev_device->devnode == NULL)
1627 udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1631 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1633 struct udev_list_entry *list_entry;
1635 udev_device->devlinks_uptodate = false;
1636 list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
1637 if (list_entry == NULL)
1642 const char *udev_device_get_id_filename(struct udev_device *udev_device)
1644 if (udev_device->id_filename == NULL) {
1645 if (udev_device_get_subsystem(udev_device) == NULL)
1648 if (major(udev_device_get_devnum(udev_device)) > 0) {
1649 /* use dev_t -- b259:131072, c254:0 */
1650 if (asprintf(&udev_device->id_filename, "%c%u:%u",
1651 streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c',
1652 major(udev_device_get_devnum(udev_device)),
1653 minor(udev_device_get_devnum(udev_device))) < 0)
1654 udev_device->id_filename = NULL;
1655 } else if (udev_device_get_ifindex(udev_device) > 0) {
1656 /* use netdev ifindex -- n3 */
1657 if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0)
1658 udev_device->id_filename = NULL;
1661 * use $subsys:$syname -- pci:0000:00:1f.2
1662 * sysname() has '!' translated, get it from devpath
1664 const char *sysname;
1665 sysname = strrchr(udev_device->devpath, '/');
1666 if (sysname == NULL)
1668 sysname = &sysname[1];
1669 if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
1670 udev_device->id_filename = NULL;
1673 return udev_device->id_filename;
1677 * udev_device_get_is_initialized:
1678 * @udev_device: udev device
1680 * Check if udev has already handled the device and has set up
1681 * device node permissions and context, or has renamed a network
1684 * This is only implemented for devices with a device node
1685 * or network interfaces. All other devices return 1 here.
1687 * Returns: 1 if the device is set up. 0 otherwise.
1689 _public_ int udev_device_get_is_initialized(struct udev_device *udev_device)
1691 if (!udev_device->info_loaded)
1692 udev_device_read_db(udev_device, NULL);
1693 return udev_device->is_initialized;
1696 void udev_device_set_is_initialized(struct udev_device *udev_device)
1698 udev_device->is_initialized = true;
1701 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1703 if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL)
1705 udev_device->tags_uptodate = false;
1706 if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
1711 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1713 udev_device->tags_uptodate = false;
1714 udev_list_cleanup(&udev_device->tags_list);
1718 * udev_device_get_tags_list_entry:
1719 * @udev_device: udev device
1721 * Retrieve the list of tags attached to the udev device. The next
1722 * list entry can be retrieved with udev_list_entry_get_next(),
1723 * which returns #NULL if no more entries exist. The tag string
1724 * can be retrieved from the list entry by udev_list_entry_get_name().
1726 * Returns: the first entry of the tag list
1728 _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1730 if (udev_device == NULL)
1732 if (!udev_device->info_loaded)
1733 udev_device_read_db(udev_device, NULL);
1734 return udev_list_get_entry(&udev_device->tags_list);
1738 * udev_device_has_tag:
1739 * @udev_device: udev device
1742 * Check if a given device has a certain tag associated.
1744 * Returns: 1 if the tag is found. 0 otherwise.
1746 _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1748 struct udev_list_entry *list_entry;
1750 if (udev_device == NULL)
1752 if (!udev_device->info_loaded)
1753 udev_device_read_db(udev_device, NULL);
1754 list_entry = udev_device_get_tags_list_entry(udev_device);
1755 if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
1760 #define ENVP_SIZE 128
1761 #define MONITOR_BUF_SIZE 4096
1762 static int update_envp_monitor_buf(struct udev_device *udev_device)
1764 struct udev_list_entry *list_entry;
1769 /* monitor buffer of property strings */
1770 free(udev_device->monitor_buf);
1771 udev_device->monitor_buf_len = 0;
1772 udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1773 if (udev_device->monitor_buf == NULL)
1776 /* envp array, strings will point into monitor buffer */
1777 if (udev_device->envp == NULL)
1778 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1779 if (udev_device->envp == NULL)
1783 s = udev_device->monitor_buf;
1784 l = MONITOR_BUF_SIZE;
1785 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1788 key = udev_list_entry_get_name(list_entry);
1789 /* skip private variables */
1793 /* add string to envp array */
1794 udev_device->envp[i++] = s;
1795 if (i+1 >= ENVP_SIZE)
1798 /* add property string to monitor buffer */
1799 l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1802 /* advance past the trailing '\0' that strpcpyl() guarantees */
1806 udev_device->envp[i] = NULL;
1807 udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1808 udev_device->envp_uptodate = true;
1812 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1814 if (!udev_device->envp_uptodate)
1815 if (update_envp_monitor_buf(udev_device) != 0)
1817 return udev_device->envp;
1820 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1822 if (!udev_device->envp_uptodate)
1823 if (update_envp_monitor_buf(udev_device) != 0)
1825 *buf = udev_device->monitor_buf;
1826 return udev_device->monitor_buf_len;
1829 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1831 free(udev_device->action);
1832 udev_device->action = strdup(action);
1833 if (udev_device->action == NULL)
1835 udev_device_add_property(udev_device, "ACTION", udev_device->action);
1839 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1841 if (!udev_device->info_loaded)
1842 udev_device_read_db(udev_device, NULL);
1843 return udev_device->devlink_priority;
1846 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1848 udev_device->devlink_priority = prio;
1852 int udev_device_get_watch_handle(struct udev_device *udev_device)
1854 if (!udev_device->info_loaded)
1855 udev_device_read_db(udev_device, NULL);
1856 return udev_device->watch_handle;
1859 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1861 udev_device->watch_handle = handle;
1865 bool udev_device_get_db_persist(struct udev_device *udev_device)
1867 return udev_device->db_persist;
1870 void udev_device_set_db_persist(struct udev_device *udev_device)
1872 udev_device->db_persist = true;