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), "%d", 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 static 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);
395 static int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
400 free(udev_device->syspath);
401 udev_device->syspath = strdup(syspath);
402 if (udev_device->syspath == NULL)
404 udev_device->devpath = udev_device->syspath + strlen("/sys");
405 udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
407 pos = strrchr(udev_device->syspath, '/');
410 udev_device->sysname = strdup(&pos[1]);
411 if (udev_device->sysname == NULL)
414 /* some devices have '!' in their name, change that to '/' */
416 while (udev_device->sysname[len] != '\0') {
417 if (udev_device->sysname[len] == '!')
418 udev_device->sysname[len] = '/';
422 /* trailing number */
423 while (len > 0 && isdigit(udev_device->sysname[--len]))
424 udev_device->sysnum = &udev_device->sysname[len];
426 /* sysname is completely numeric */
428 udev_device->sysnum = NULL;
434 * parse property string, and if needed, update internal values accordingly
436 * udev_device_add_property_from_string_parse_finish() needs to be
437 * called after adding properties, and its return value checked
439 * udev_device_set_info_loaded() needs to be set, to avoid trying
440 * to use a device without a DEVPATH set
442 void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
444 if (startswith(property, "DEVPATH=")) {
445 char path[UTIL_PATH_SIZE];
447 strscpyl(path, sizeof(path), "/sys", &property[8], NULL);
448 udev_device_set_syspath(udev_device, path);
449 } else if (startswith(property, "SUBSYSTEM=")) {
450 udev_device_set_subsystem(udev_device, &property[10]);
451 } else if (startswith(property, "DEVTYPE=")) {
452 udev_device_set_devtype(udev_device, &property[8]);
453 } else if (startswith(property, "DEVNAME=")) {
454 udev_device_set_devnode(udev_device, &property[8]);
455 } else if (startswith(property, "DEVLINKS=")) {
456 char devlinks[UTIL_PATH_SIZE];
460 strscpy(devlinks, sizeof(devlinks), &property[9]);
462 next = strchr(slink, ' ');
463 while (next != NULL) {
465 udev_device_add_devlink(udev_device, slink);
467 next = strchr(slink, ' ');
469 if (slink[0] != '\0')
470 udev_device_add_devlink(udev_device, slink);
471 } else if (startswith(property, "TAGS=")) {
472 char tags[UTIL_PATH_SIZE];
475 strscpy(tags, sizeof(tags), &property[5]);
476 next = strchr(tags, ':');
479 while (next[0] != '\0') {
483 next = strchr(tag, ':');
488 udev_device_add_tag(udev_device, tag);
491 } else if (startswith(property, "USEC_INITIALIZED=")) {
492 udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
493 } else if (startswith(property, "DRIVER=")) {
494 udev_device_set_driver(udev_device, &property[7]);
495 } else if (startswith(property, "ACTION=")) {
496 udev_device_set_action(udev_device, &property[7]);
497 } else if (startswith(property, "MAJOR=")) {
498 udev_device->maj = strtoull(&property[6], NULL, 10);
499 } else if (startswith(property, "MINOR=")) {
500 udev_device->min = strtoull(&property[6], NULL, 10);
501 } else if (startswith(property, "DEVPATH_OLD=")) {
502 udev_device_set_devpath_old(udev_device, &property[12]);
503 } else if (startswith(property, "SEQNUM=")) {
504 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
505 } else if (startswith(property, "IFINDEX=")) {
506 udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
507 } else if (startswith(property, "DEVMODE=")) {
508 udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
509 } else if (startswith(property, "DEVUID=")) {
510 udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10));
511 } else if (startswith(property, "DEVGID=")) {
512 udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10));
514 udev_device_add_property_from_string(udev_device, property);
518 int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
520 if (udev_device->maj > 0)
521 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
522 udev_device->maj = 0;
523 udev_device->min = 0;
525 if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
531 * udev_device_get_property_value:
532 * @udev_device: udev device
533 * @key: property name
535 * Get the value of a given property.
537 * Returns: the property string, or #NULL if there is no such property.
539 _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
541 struct udev_list_entry *list_entry;
543 if (udev_device == NULL)
548 list_entry = udev_device_get_properties_list_entry(udev_device);
549 list_entry = udev_list_entry_get_by_name(list_entry, key);
550 return udev_list_entry_get_value(list_entry);
553 int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
555 char filename[UTIL_PATH_SIZE];
556 char line[UTIL_LINE_SIZE];
559 /* providing a database file will always force-load it */
560 if (dbfile == NULL) {
563 if (udev_device->db_loaded)
565 udev_device->db_loaded = true;
567 id = udev_device_get_id_filename(udev_device);
570 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
574 f = fopen(dbfile, "re");
576 return log_debug_errno(errno, "no db file to read %s: %m", dbfile);
578 /* devices with a database entry are initialized */
579 udev_device->is_initialized = true;
581 while (fgets(line, sizeof(line), f)) {
584 struct udev_list_entry *entry;
593 strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
594 udev_device_add_devlink(udev_device, filename);
597 udev_device_set_devlink_priority(udev_device, atoi(val));
600 entry = udev_device_add_property_from_string(udev_device, val);
601 udev_list_entry_set_num(entry, true);
604 udev_device_add_tag(udev_device, val);
607 udev_device_set_watch_handle(udev_device, atoi(val));
610 udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
616 log_debug("device %p filled with db file data", udev_device);
620 int udev_device_read_uevent_file(struct udev_device *udev_device)
622 char filename[UTIL_PATH_SIZE];
624 char line[UTIL_LINE_SIZE];
628 if (udev_device->uevent_loaded)
631 strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
632 f = fopen(filename, "re");
635 udev_device->uevent_loaded = true;
637 while (fgets(line, sizeof(line), f)) {
640 pos = strchr(line, '\n');
645 if (startswith(line, "DEVTYPE=")) {
646 udev_device_set_devtype(udev_device, &line[8]);
649 if (startswith(line, "IFINDEX=")) {
650 udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
653 if (startswith(line, "DEVNAME=")) {
654 udev_device_set_devnode(udev_device, &line[8]);
658 if (startswith(line, "MAJOR="))
659 maj = strtoull(&line[6], NULL, 10);
660 else if (startswith(line, "MINOR="))
661 min = strtoull(&line[6], NULL, 10);
662 else if (startswith(line, "DEVMODE="))
663 udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
665 udev_device_add_property_from_string(udev_device, line);
668 udev_device->devnum = makedev(maj, min);
673 void udev_device_set_info_loaded(struct udev_device *device)
675 device->info_loaded = true;
678 static struct udev_device *udev_device_new(struct udev *udev)
680 struct udev_device *udev_device;
687 udev_device = new0(struct udev_device, 1);
688 if (udev_device == NULL) {
692 udev_device->refcount = 1;
693 udev_device->udev = udev;
694 udev_list_init(udev, &udev_device->devlinks_list, true);
695 udev_list_init(udev, &udev_device->properties_list, true);
696 udev_list_init(udev, &udev_device->sysattr_value_list, true);
697 udev_list_init(udev, &udev_device->sysattr_list, false);
698 udev_list_init(udev, &udev_device->tags_list, true);
699 udev_device->watch_handle = -1;
705 * udev_device_new_from_syspath:
706 * @udev: udev library context
707 * @syspath: sys device path including sys directory
709 * Create new udev device, and fill in information from the sys
710 * device and the udev database entry. The syspath is the absolute
711 * path to the device, including the sys mount point.
713 * The initial refcount is 1, and needs to be decremented to
714 * release the resources of the udev device.
716 * Returns: a new udev device, or #NULL, if it does not exist
718 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
721 char path[UTIL_PATH_SIZE];
724 struct udev_device *udev_device;
731 if (syspath == NULL) {
736 /* path starts in sys */
737 if (!startswith(syspath, "/sys")) {
738 log_debug("not in sys :%s", syspath);
743 /* path is not a root directory */
744 subdir = syspath + strlen("/sys");
745 pos = strrchr(subdir, '/');
746 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
751 /* resolve possible symlink to real path */
752 strscpy(path, sizeof(path), syspath);
753 util_resolve_sys_link(udev, path, sizeof(path));
755 if (startswith(path + strlen("/sys"), "/devices/")) {
756 char file[UTIL_PATH_SIZE];
758 /* all "devices" require a "uevent" file */
759 strscpyl(file, sizeof(file), path, "/uevent", NULL);
760 if (stat(file, &statbuf) != 0)
763 /* everything else just needs to be a directory */
764 if (stat(path, &statbuf) != 0)
767 if (!S_ISDIR(statbuf.st_mode)) {
773 udev_device = udev_device_new(udev);
774 if (udev_device == NULL)
777 udev_device_set_syspath(udev_device, path);
778 log_debug("device %p has devpath '%s'", udev_device, udev_device_get_devpath(udev_device));
784 * udev_device_new_from_devnum:
785 * @udev: udev library context
786 * @type: char or block device
787 * @devnum: device major/minor number
789 * Create new udev device, and fill in information from the sys
790 * device and the udev database entry. The device is looked-up
791 * by its major/minor number and type. Character and block device
792 * numbers are not unique across the two types.
794 * The initial refcount is 1, and needs to be decremented to
795 * release the resources of the udev device.
797 * Returns: a new udev device, or #NULL, if it does not exist
799 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
801 char path[UTIL_PATH_SIZE];
802 const char *type_str;
806 else if (type == 'c')
813 /* use /sys/dev/{block,char}/<maj>:<min> link */
814 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
815 type_str, major(devnum), minor(devnum));
816 return udev_device_new_from_syspath(udev, path);
820 * udev_device_new_from_device_id:
821 * @udev: udev library context
822 * @id: text string identifying a kernel device
824 * Create new udev device, and fill in information from the sys
825 * device and the udev database entry. The device is looked-up
826 * by a special string:
827 * b8:2 - block device major:minor
828 * c128:1 - char device major:minor
829 * n3 - network device ifindex
830 * +sound:card29 - kernel driver core subsystem:device name
832 * The initial refcount is 1, and needs to be decremented to
833 * release the resources of the udev device.
835 * Returns: a new udev device, or #NULL, if it does not exist
837 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
841 char subsys[UTIL_PATH_SIZE];
847 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
849 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
853 struct udev_device *dev;
856 ifindex = strtoul(&id[1], NULL, 10);
862 sk = socket(PF_INET, SOCK_DGRAM, 0);
865 memzero(&ifr, sizeof(struct ifreq));
866 ifr.ifr_ifindex = ifindex;
867 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
873 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
876 if (udev_device_get_ifindex(dev) == ifindex)
879 /* this is racy, so we may end up with the wrong device */
880 udev_device_unref(dev);
885 strscpy(subsys, sizeof(subsys), &id[1]);
886 sysname = strchr(subsys, ':');
887 if (sysname == NULL) {
892 sysname = &sysname[1];
893 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
901 * udev_device_new_from_subsystem_sysname:
902 * @udev: udev library context
903 * @subsystem: the subsystem of the device
904 * @sysname: the name of the device
906 * Create new udev device, and fill in information from the sys device
907 * and the udev database entry. The device is looked up by the subsystem
908 * and name string of the device, like "mem" / "zero", or "block" / "sda".
910 * The initial refcount is 1, and needs to be decremented to
911 * release the resources of the udev device.
913 * Returns: a new udev device, or #NULL, if it does not exist
915 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
917 char path[UTIL_PATH_SIZE];
920 if (streq(subsystem, "subsystem")) {
921 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
922 if (stat(path, &statbuf) == 0)
925 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
926 if (stat(path, &statbuf) == 0)
929 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
930 if (stat(path, &statbuf) == 0)
935 if (streq(subsystem, "module")) {
936 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
937 if (stat(path, &statbuf) == 0)
942 if (streq(subsystem, "drivers")) {
943 char subsys[UTIL_NAME_SIZE];
946 strscpy(subsys, sizeof(subsys), sysname);
947 driver = strchr(subsys, ':');
948 if (driver != NULL) {
952 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
953 if (stat(path, &statbuf) == 0)
956 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
957 if (stat(path, &statbuf) == 0)
965 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
966 if (stat(path, &statbuf) == 0)
969 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
970 if (stat(path, &statbuf) == 0)
973 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
974 if (stat(path, &statbuf) == 0)
979 return udev_device_new_from_syspath(udev, path);
983 * udev_device_new_from_environment
984 * @udev: udev library context
986 * Create new udev device, and fill in information from the
987 * current process environment. This only works reliable if
988 * the process is called from a udev rule. It is usually used
989 * for tools executed from IMPORT= rules.
991 * The initial refcount is 1, and needs to be decremented to
992 * release the resources of the udev device.
994 * Returns: a new udev device, or #NULL, if it does not exist
996 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
999 struct udev_device *udev_device;
1001 udev_device = udev_device_new(udev);
1002 if (udev_device == NULL)
1004 udev_device_set_info_loaded(udev_device);
1006 for (i = 0; environ[i] != NULL; i++)
1007 udev_device_add_property_from_string_parse(udev_device, environ[i]);
1009 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
1010 log_debug("missing values, invalid device");
1011 udev_device_unref(udev_device);
1018 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
1020 struct udev_device *udev_device_parent = NULL;
1021 char path[UTIL_PATH_SIZE];
1024 strscpy(path, sizeof(path), udev_device->syspath);
1025 subdir = path + strlen("/sys/");
1029 pos = strrchr(subdir, '/');
1030 if (pos == NULL || pos < &subdir[2])
1033 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
1034 if (udev_device_parent != NULL)
1035 return udev_device_parent;
1043 * udev_device_get_parent:
1044 * @udev_device: the device to start searching from
1046 * Find the next parent device, and fill in information from the sys
1047 * device and the udev database entry.
1049 * Returned device is not referenced. It is attached to the child
1050 * device, and will be cleaned up when the child device is cleaned up.
1052 * It is not necessarily just the upper level directory, empty or not
1053 * recognized sys directories are ignored.
1055 * It can be called as many times as needed, without caring about
1058 * Returns: a new udev device, or #NULL, if it no parent exist.
1060 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
1062 if (udev_device == NULL) {
1066 if (!udev_device->parent_set) {
1067 udev_device->parent_set = true;
1068 udev_device->parent_device = device_new_from_parent(udev_device);
1070 return udev_device->parent_device;
1074 * udev_device_get_parent_with_subsystem_devtype:
1075 * @udev_device: udev device to start searching from
1076 * @subsystem: the subsystem of the device
1077 * @devtype: the type (DEVTYPE) of the device
1079 * Find the next parent device, with a matching subsystem and devtype
1080 * value, and fill in information from the sys device and the udev
1083 * If devtype is #NULL, only subsystem is checked, and any devtype will
1086 * Returned device is not referenced. It is attached to the child
1087 * device, and will be cleaned up when the child device is cleaned up.
1089 * It can be called as many times as needed, without caring about
1092 * Returns: a new udev device, or #NULL if no matching parent exists.
1094 _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
1096 struct udev_device *parent;
1098 if (subsystem == NULL) {
1103 parent = udev_device_get_parent(udev_device);
1104 while (parent != NULL) {
1105 const char *parent_subsystem;
1106 const char *parent_devtype;
1108 parent_subsystem = udev_device_get_subsystem(parent);
1109 if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
1110 if (devtype == NULL)
1112 parent_devtype = udev_device_get_devtype(parent);
1113 if (parent_devtype != NULL && streq(parent_devtype, devtype))
1116 parent = udev_device_get_parent(parent);
1126 * udev_device_get_udev:
1127 * @udev_device: udev device
1129 * Retrieve the udev library context the device was created with.
1131 * Returns: the udev library context
1133 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
1135 if (udev_device == NULL)
1137 return udev_device->udev;
1142 * @udev_device: udev device
1144 * Take a reference of a udev device.
1146 * Returns: the passed udev device
1148 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
1150 if (udev_device == NULL)
1152 udev_device->refcount++;
1157 * udev_device_unref:
1158 * @udev_device: udev device
1160 * Drop a reference of a udev device. If the refcount reaches zero,
1161 * the resources of the device will be released.
1165 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
1167 if (udev_device == NULL)
1169 udev_device->refcount--;
1170 if (udev_device->refcount > 0)
1172 if (udev_device->parent_device != NULL)
1173 udev_device_unref(udev_device->parent_device);
1174 free(udev_device->syspath);
1175 free(udev_device->sysname);
1176 free(udev_device->devnode);
1177 free(udev_device->subsystem);
1178 free(udev_device->devtype);
1179 udev_list_cleanup(&udev_device->devlinks_list);
1180 udev_list_cleanup(&udev_device->properties_list);
1181 udev_list_cleanup(&udev_device->sysattr_value_list);
1182 udev_list_cleanup(&udev_device->sysattr_list);
1183 udev_list_cleanup(&udev_device->tags_list);
1184 free(udev_device->action);
1185 free(udev_device->driver);
1186 free(udev_device->devpath_old);
1187 free(udev_device->id_filename);
1188 free(udev_device->envp);
1189 free(udev_device->monitor_buf);
1195 * udev_device_get_devpath:
1196 * @udev_device: udev device
1198 * Retrieve the kernel devpath value of the udev device. The path
1199 * does not contain the sys mount point, and starts with a '/'.
1201 * Returns: the devpath of the udev device
1203 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
1205 if (udev_device == NULL)
1207 return udev_device->devpath;
1211 * udev_device_get_syspath:
1212 * @udev_device: udev device
1214 * Retrieve the sys path of the udev device. The path is an
1215 * absolute path and starts with the sys mount point.
1217 * Returns: the sys path of the udev device
1219 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
1221 if (udev_device == NULL)
1223 return udev_device->syspath;
1227 * udev_device_get_sysname:
1228 * @udev_device: udev device
1230 * Get the kernel device name in /sys.
1232 * Returns: the name string of the device device
1234 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
1236 if (udev_device == NULL)
1238 return udev_device->sysname;
1242 * udev_device_get_sysnum:
1243 * @udev_device: udev device
1245 * Get the instance number of the device.
1247 * Returns: the trailing number string of the device name
1249 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
1251 if (udev_device == NULL)
1253 return udev_device->sysnum;
1257 * udev_device_get_devnode:
1258 * @udev_device: udev device
1260 * Retrieve the device node file name belonging to the udev device.
1261 * The path is an absolute path, and starts with the device directory.
1263 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1265 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
1267 if (udev_device == NULL)
1269 if (udev_device->devnode != NULL)
1270 return udev_device->devnode;
1271 if (!udev_device->info_loaded)
1272 udev_device_read_uevent_file(udev_device);
1273 return udev_device->devnode;
1277 * udev_device_get_devlinks_list_entry:
1278 * @udev_device: udev device
1280 * Retrieve the list of device links pointing to the device file of
1281 * the udev device. The next list entry can be retrieved with
1282 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1283 * The devlink path can be retrieved from the list entry by
1284 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1285 * the device directory.
1287 * Returns: the first entry of the device node link list
1289 _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
1291 if (udev_device == NULL)
1293 if (!udev_device->info_loaded)
1294 udev_device_read_db(udev_device, NULL);
1295 return udev_list_get_entry(&udev_device->devlinks_list);
1298 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
1300 udev_device->devlinks_uptodate = false;
1301 udev_list_cleanup(&udev_device->devlinks_list);
1305 * udev_device_get_properties_list_entry:
1306 * @udev_device: udev device
1308 * Retrieve the list of key/value device properties of the udev
1309 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1310 * which returns #NULL if no more entries exist. The property name
1311 * can be retrieved from the list entry by udev_list_entry_get_name(),
1312 * the property value by udev_list_entry_get_value().
1314 * Returns: the first entry of the property list
1316 _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
1318 if (udev_device == NULL)
1320 if (!udev_device->info_loaded) {
1321 udev_device_read_uevent_file(udev_device);
1322 udev_device_read_db(udev_device, NULL);
1324 if (!udev_device->devlinks_uptodate) {
1325 char symlinks[UTIL_PATH_SIZE];
1326 struct udev_list_entry *list_entry;
1328 udev_device->devlinks_uptodate = true;
1329 list_entry = udev_device_get_devlinks_list_entry(udev_device);
1330 if (list_entry != NULL) {
1335 l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
1336 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
1337 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1338 udev_device_add_property(udev_device, "DEVLINKS", symlinks);
1341 if (!udev_device->tags_uptodate) {
1342 udev_device->tags_uptodate = true;
1343 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1344 char tags[UTIL_PATH_SIZE];
1345 struct udev_list_entry *list_entry;
1350 l = strpcpyl(&s, sizeof(tags), ":", NULL);
1351 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1352 l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1353 udev_device_add_property(udev_device, "TAGS", tags);
1356 return udev_list_get_entry(&udev_device->properties_list);
1360 * udev_device_get_action:
1361 * @udev_device: udev device
1363 * This is only valid if the device was received through a monitor. Devices read from
1364 * sys do not have an action string. Usual actions are: add, remove, change, online,
1367 * Returns: the kernel action value, or #NULL if there is no action value available.
1369 _public_ const char *udev_device_get_action(struct udev_device *udev_device)
1371 if (udev_device == NULL)
1373 return udev_device->action;
1377 * udev_device_get_usec_since_initialized:
1378 * @udev_device: udev device
1380 * Return the number of microseconds passed since udev set up the
1381 * device for the first time.
1383 * This is only implemented for devices with need to store properties
1384 * in the udev database. All other devices return 0 here.
1386 * Returns: the number of microseconds since the device was first seen.
1388 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
1392 if (udev_device == NULL)
1394 if (!udev_device->info_loaded)
1395 udev_device_read_db(udev_device, NULL);
1396 if (udev_device->usec_initialized == 0)
1398 now_ts = now(CLOCK_MONOTONIC);
1401 return now_ts - udev_device->usec_initialized;
1404 usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
1406 return udev_device->usec_initialized;
1409 void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
1413 udev_device->usec_initialized = usec_initialized;
1414 snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
1415 udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
1419 * udev_device_get_sysattr_value:
1420 * @udev_device: udev device
1421 * @sysattr: attribute name
1423 * The retrieved value is cached in the device. Repeated calls will return the same
1424 * value and not open the attribute again.
1426 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1428 _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1430 struct udev_list_entry *list_entry;
1431 char path[UTIL_PATH_SIZE];
1433 struct stat statbuf;
1436 const char *val = NULL;
1438 if (udev_device == NULL)
1440 if (sysattr == NULL)
1443 /* look for possibly already cached result */
1444 list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
1445 list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
1446 if (list_entry != NULL)
1447 return udev_list_entry_get_value(list_entry);
1449 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1450 if (lstat(path, &statbuf) != 0) {
1451 udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
1455 if (S_ISLNK(statbuf.st_mode)) {
1457 * Some core links return only the last element of the target path,
1458 * these are just values, the paths should not be exposed.
1460 if (streq(sysattr, "driver") ||
1461 streq(sysattr, "subsystem") ||
1462 streq(sysattr, "module")) {
1463 if (util_get_sys_core_link_value(udev_device->udev, sysattr,
1464 udev_device->syspath, value, sizeof(value)) < 0)
1466 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1467 val = udev_list_entry_get_value(list_entry);
1474 /* skip directories */
1475 if (S_ISDIR(statbuf.st_mode))
1478 /* skip non-readable files */
1479 if ((statbuf.st_mode & S_IRUSR) == 0)
1482 /* read attribute value */
1483 fd = open(path, O_RDONLY|O_CLOEXEC);
1486 size = read(fd, value, sizeof(value));
1490 if (size == sizeof(value))
1493 /* got a valid value, store it in cache and return it */
1495 util_remove_trailing_chars(value, '\n');
1496 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1497 val = udev_list_entry_get_value(list_entry);
1503 * udev_device_set_sysattr_value:
1504 * @udev_device: udev device
1505 * @sysattr: attribute name
1506 * @value: new value to be set
1508 * Update the contents of the sys attribute and the cached value of the device.
1510 * Returns: Negative error code on failure or 0 on success.
1512 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
1514 struct udev_device *dev;
1515 char path[UTIL_PATH_SIZE];
1516 struct stat statbuf;
1518 ssize_t size, value_len;
1521 if (udev_device == NULL)
1524 if (sysattr == NULL)
1529 value_len = strlen(value);
1531 strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
1532 if (lstat(path, &statbuf) != 0) {
1533 udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
1538 if (S_ISLNK(statbuf.st_mode)) {
1543 /* skip directories */
1544 if (S_ISDIR(statbuf.st_mode)) {
1549 /* skip non-readable files */
1550 if ((statbuf.st_mode & S_IRUSR) == 0) {
1555 /* Value is limited to 4k */
1556 if (value_len > 4096) {
1560 util_remove_trailing_chars(value, '\n');
1562 /* write attribute value */
1563 fd = open(path, O_WRONLY|O_CLOEXEC);
1568 size = write(fd, value, value_len);
1574 if (size < value_len) {
1579 /* wrote a valid value, store it in cache and return it */
1580 udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
1582 if (dev != udev_device)
1583 udev_device_unref(dev);
1587 static int udev_device_sysattr_list_read(struct udev_device *udev_device)
1589 struct dirent *dent;
1593 if (udev_device == NULL)
1595 if (udev_device->sysattr_list_read)
1598 dir = opendir(udev_device_get_syspath(udev_device));
1602 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1603 char path[UTIL_PATH_SIZE];
1604 struct stat statbuf;
1606 /* only handle symlinks and regular files */
1607 if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
1610 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
1611 if (lstat(path, &statbuf) != 0)
1613 if ((statbuf.st_mode & S_IRUSR) == 0)
1616 udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
1621 udev_device->sysattr_list_read = true;
1627 * udev_device_get_sysattr_list_entry:
1628 * @udev_device: udev device
1630 * Retrieve the list of available sysattrs, with value being empty;
1631 * This just return all available sysfs attributes for a particular
1632 * device without reading their values.
1634 * Returns: the first entry of the property list
1636 _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
1638 if (!udev_device->sysattr_list_read) {
1640 ret = udev_device_sysattr_list_read(udev_device);
1645 return udev_list_get_entry(&udev_device->sysattr_list);
1648 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1650 free(udev_device->devnode);
1651 if (devnode[0] != '/') {
1652 if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
1653 udev_device->devnode = NULL;
1655 udev_device->devnode = strdup(devnode);
1657 if (udev_device->devnode == NULL)
1659 udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1663 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1665 struct udev_list_entry *list_entry;
1667 udev_device->devlinks_uptodate = false;
1668 list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
1669 if (list_entry == NULL)
1674 const char *udev_device_get_id_filename(struct udev_device *udev_device)
1676 if (udev_device->id_filename == NULL) {
1677 if (udev_device_get_subsystem(udev_device) == NULL)
1680 if (major(udev_device_get_devnum(udev_device)) > 0) {
1681 /* use dev_t -- b259:131072, c254:0 */
1682 if (asprintf(&udev_device->id_filename, "%c%u:%u",
1683 streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c',
1684 major(udev_device_get_devnum(udev_device)),
1685 minor(udev_device_get_devnum(udev_device))) < 0)
1686 udev_device->id_filename = NULL;
1687 } else if (udev_device_get_ifindex(udev_device) > 0) {
1688 /* use netdev ifindex -- n3 */
1689 if (asprintf(&udev_device->id_filename, "n%i", udev_device_get_ifindex(udev_device)) < 0)
1690 udev_device->id_filename = NULL;
1693 * use $subsys:$syname -- pci:0000:00:1f.2
1694 * sysname() has '!' translated, get it from devpath
1696 const char *sysname;
1697 sysname = strrchr(udev_device->devpath, '/');
1698 if (sysname == NULL)
1700 sysname = &sysname[1];
1701 if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
1702 udev_device->id_filename = NULL;
1705 return udev_device->id_filename;
1709 * udev_device_get_is_initialized:
1710 * @udev_device: udev device
1712 * Check if udev has already handled the device and has set up
1713 * device node permissions and context, or has renamed a network
1716 * This is only implemented for devices with a device node
1717 * or network interfaces. All other devices return 1 here.
1719 * Returns: 1 if the device is set up. 0 otherwise.
1721 _public_ int udev_device_get_is_initialized(struct udev_device *udev_device)
1723 if (!udev_device->info_loaded)
1724 udev_device_read_db(udev_device, NULL);
1725 return udev_device->is_initialized;
1728 void udev_device_set_is_initialized(struct udev_device *udev_device)
1730 udev_device->is_initialized = true;
1733 static bool is_valid_tag(const char *tag)
1735 return !strchr(tag, ':') && !strchr(tag, ' ');
1738 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1740 if (!is_valid_tag(tag))
1742 udev_device->tags_uptodate = false;
1743 if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
1748 void udev_device_remove_tag(struct udev_device *udev_device, const char *tag)
1750 struct udev_list_entry *e;
1752 if (!is_valid_tag(tag))
1754 e = udev_list_get_entry(&udev_device->tags_list);
1755 e = udev_list_entry_get_by_name(e, tag);
1757 udev_device->tags_uptodate = false;
1758 udev_list_entry_delete(e);
1762 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1764 udev_device->tags_uptodate = false;
1765 udev_list_cleanup(&udev_device->tags_list);
1769 * udev_device_get_tags_list_entry:
1770 * @udev_device: udev device
1772 * Retrieve the list of tags attached to the udev device. The next
1773 * list entry can be retrieved with udev_list_entry_get_next(),
1774 * which returns #NULL if no more entries exist. The tag string
1775 * can be retrieved from the list entry by udev_list_entry_get_name().
1777 * Returns: the first entry of the tag list
1779 _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1781 if (udev_device == NULL)
1783 if (!udev_device->info_loaded)
1784 udev_device_read_db(udev_device, NULL);
1785 return udev_list_get_entry(&udev_device->tags_list);
1789 * udev_device_has_tag:
1790 * @udev_device: udev device
1793 * Check if a given device has a certain tag associated.
1795 * Returns: 1 if the tag is found. 0 otherwise.
1797 _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1799 struct udev_list_entry *list_entry;
1801 if (udev_device == NULL)
1803 if (!udev_device->info_loaded)
1804 udev_device_read_db(udev_device, NULL);
1805 list_entry = udev_device_get_tags_list_entry(udev_device);
1806 if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
1811 #define ENVP_SIZE 128
1812 #define MONITOR_BUF_SIZE 4096
1813 static int update_envp_monitor_buf(struct udev_device *udev_device)
1815 struct udev_list_entry *list_entry;
1820 /* monitor buffer of property strings */
1821 free(udev_device->monitor_buf);
1822 udev_device->monitor_buf_len = 0;
1823 udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1824 if (udev_device->monitor_buf == NULL)
1827 /* envp array, strings will point into monitor buffer */
1828 if (udev_device->envp == NULL)
1829 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1830 if (udev_device->envp == NULL)
1834 s = udev_device->monitor_buf;
1835 l = MONITOR_BUF_SIZE;
1836 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1839 key = udev_list_entry_get_name(list_entry);
1840 /* skip private variables */
1844 /* add string to envp array */
1845 udev_device->envp[i++] = s;
1846 if (i+1 >= ENVP_SIZE)
1849 /* add property string to monitor buffer */
1850 l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1853 /* advance past the trailing '\0' that strpcpyl() guarantees */
1857 udev_device->envp[i] = NULL;
1858 udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1859 udev_device->envp_uptodate = true;
1863 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1865 if (!udev_device->envp_uptodate)
1866 if (update_envp_monitor_buf(udev_device) != 0)
1868 return udev_device->envp;
1871 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1873 if (!udev_device->envp_uptodate)
1874 if (update_envp_monitor_buf(udev_device) != 0)
1876 *buf = udev_device->monitor_buf;
1877 return udev_device->monitor_buf_len;
1880 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1882 free(udev_device->action);
1883 udev_device->action = strdup(action);
1884 if (udev_device->action == NULL)
1886 udev_device_add_property(udev_device, "ACTION", udev_device->action);
1890 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1892 if (!udev_device->info_loaded)
1893 udev_device_read_db(udev_device, NULL);
1894 return udev_device->devlink_priority;
1897 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1899 udev_device->devlink_priority = prio;
1903 int udev_device_get_watch_handle(struct udev_device *udev_device)
1905 if (!udev_device->info_loaded)
1906 udev_device_read_db(udev_device, NULL);
1907 return udev_device->watch_handle;
1910 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1912 udev_device->watch_handle = handle;
1916 bool udev_device_get_db_persist(struct udev_device *udev_device)
1918 return udev_device->db_persist;
1921 void udev_device_set_db_persist(struct udev_device *udev_device)
1923 udev_device->db_persist = true;
1926 int udev_device_rename(struct udev_device *udev_device, const char *name)
1928 _cleanup_free_ char *dirname = NULL;
1932 if (udev_device == NULL || name == NULL)
1935 dirname = dirname_malloc(udev_device->syspath);
1939 new_syspath = strjoina(dirname, "/", name);
1941 r = udev_device_set_syspath(udev_device, new_syspath);
1948 struct udev_device *udev_device_shallow_clone(struct udev_device *old_device)
1950 struct udev_device *device;
1952 if (old_device == NULL)
1955 device = udev_device_new(old_device->udev);
1962 udev_device_set_syspath(device, udev_device_get_syspath(old_device));
1963 udev_device_set_subsystem(device, udev_device_get_subsystem(old_device));
1964 udev_device_set_devnum(device, udev_device_get_devnum(old_device));
1969 struct udev_device *udev_device_new_from_nulstr(struct udev *udev, char *nulstr, ssize_t buflen) {
1970 struct udev_device *device;
1973 if (nulstr == NULL || buflen <= 0) {
1979 device = udev_device_new(udev);
1986 udev_device_set_info_loaded(device);
1988 while (bufpos < buflen) {
1992 key = nulstr + bufpos;
1993 keylen = strlen(key);
1997 bufpos += keylen + 1;
1998 udev_device_add_property_from_string_parse(device, key);
2001 if (udev_device_add_property_from_string_parse_finish(device) < 0) {
2002 log_debug("missing values, invalid device");
2004 udev_device_unref(device);