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