2 This file is part of systemd.
4 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
32 #include <sys/ioctl.h>
33 #include <sys/socket.h>
34 #include <linux/sockios.h>
37 #include "libudev-private.h"
39 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode);
42 * SECTION:libudev-device
43 * @short_description: kernel sys devices
45 * Representation of kernel sys devices. Devices are uniquely identified
46 * by their syspath, every device has exactly one path in the kernel sys
47 * filesystem. Devices usually belong to a kernel subsystem, and have
48 * a unique name inside that subsystem.
54 * Opaque object representing one kernel sys device.
58 struct udev_device *parent_device;
75 size_t monitor_buf_len;
76 struct udev_list devlinks_list;
77 struct udev_list properties_list;
78 struct udev_list sysattr_value_list;
79 struct udev_list sysattr_list;
80 struct udev_list tags_list;
81 unsigned long long int seqnum;
82 usec_t usec_initialized;
92 bool devlinks_uptodate;
100 bool sysattr_list_read;
105 * udev_device_get_seqnum:
106 * @udev_device: udev device
108 * This is only valid if the device was received through a monitor. Devices read from
109 * sys do not have a sequence number.
111 * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
113 _public_ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
115 if (udev_device == NULL)
117 return udev_device->seqnum;
120 static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
124 udev_device->seqnum = seqnum;
125 snprintf(num, sizeof(num), "%llu", seqnum);
126 udev_device_add_property(udev_device, "SEQNUM", num);
130 int udev_device_get_ifindex(struct udev_device *udev_device)
132 if (!udev_device->info_loaded)
133 udev_device_read_uevent_file(udev_device);
134 return udev_device->ifindex;
137 static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
141 udev_device->ifindex = ifindex;
142 snprintf(num, sizeof(num), "%u", ifindex);
143 udev_device_add_property(udev_device, "IFINDEX", num);
148 * udev_device_get_devnum:
149 * @udev_device: udev device
151 * Get the device major/minor number.
153 * Returns: the dev_t number.
155 _public_ dev_t udev_device_get_devnum(struct udev_device *udev_device)
157 if (udev_device == NULL)
158 return makedev(0, 0);
159 if (!udev_device->info_loaded)
160 udev_device_read_uevent_file(udev_device);
161 return udev_device->devnum;
164 static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
168 udev_device->devnum = devnum;
170 snprintf(num, sizeof(num), "%u", major(devnum));
171 udev_device_add_property(udev_device, "MAJOR", num);
172 snprintf(num, sizeof(num), "%u", minor(devnum));
173 udev_device_add_property(udev_device, "MINOR", num);
177 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
179 return udev_device->devpath_old;
182 static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
186 free(udev_device->devpath_old);
187 udev_device->devpath_old = strdup(devpath_old);
188 if (udev_device->devpath_old == NULL)
190 udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
192 pos = strrchr(udev_device->devpath_old, '/');
199 * udev_device_get_driver:
200 * @udev_device: udev device
202 * Get the kernel driver name.
204 * Returns: the driver name string, or #NULL if there is no driver attached.
206 _public_ const char *udev_device_get_driver(struct udev_device *udev_device)
208 char driver[UTIL_NAME_SIZE];
210 if (udev_device == NULL)
212 if (!udev_device->driver_set) {
213 udev_device->driver_set = true;
214 if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0)
215 udev_device->driver = strdup(driver);
217 return udev_device->driver;
220 static int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
222 free(udev_device->driver);
223 udev_device->driver = strdup(driver);
224 if (udev_device->driver == NULL)
226 udev_device->driver_set = true;
227 udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
232 * udev_device_get_devtype:
233 * @udev_device: udev device
235 * Retrieve the devtype string of the udev device.
237 * Returns: the devtype name of the udev device, or #NULL if it can not be determined
239 _public_ const char *udev_device_get_devtype(struct udev_device *udev_device)
241 if (udev_device == NULL)
243 if (!udev_device->devtype_set) {
244 udev_device->devtype_set = true;
245 udev_device_read_uevent_file(udev_device);
247 return udev_device->devtype;
250 static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
252 free(udev_device->devtype);
253 udev_device->devtype = strdup(devtype);
254 if (udev_device->devtype == NULL)
256 udev_device->devtype_set = true;
257 udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
261 int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
263 free(udev_device->subsystem);
264 udev_device->subsystem = strdup(subsystem);
265 if (udev_device->subsystem == NULL)
267 udev_device->subsystem_set = true;
268 udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
273 * udev_device_get_subsystem:
274 * @udev_device: udev device
276 * Retrieve the subsystem string of the udev device. The string does not
279 * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
281 _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device)
283 char subsystem[UTIL_NAME_SIZE];
285 if (udev_device == NULL)
287 if (!udev_device->subsystem_set) {
288 udev_device->subsystem_set = true;
289 /* read "subsystem" link */
290 if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
291 udev_device_set_subsystem(udev_device, subsystem);
292 return udev_device->subsystem;
295 if (startswith(udev_device->devpath, "/module/")) {
296 udev_device_set_subsystem(udev_device, "module");
297 return udev_device->subsystem;
299 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
300 udev_device_set_subsystem(udev_device, "drivers");
301 return udev_device->subsystem;
303 if (startswith(udev_device->devpath, "/subsystem/") ||
304 startswith(udev_device->devpath, "/class/") ||
305 startswith(udev_device->devpath, "/bus/")) {
306 udev_device_set_subsystem(udev_device, "subsystem");
307 return udev_device->subsystem;
310 return udev_device->subsystem;
313 mode_t udev_device_get_devnode_mode(struct udev_device *udev_device)
315 if (!udev_device->info_loaded)
316 udev_device_read_uevent_file(udev_device);
317 return udev_device->devnode_mode;
320 static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode)
324 udev_device->devnode_mode = mode;
325 snprintf(num, sizeof(num), "%#o", mode);
326 udev_device_add_property(udev_device, "DEVMODE", num);
330 uid_t udev_device_get_devnode_uid(struct udev_device *udev_device)
332 if (!udev_device->info_loaded)
333 udev_device_read_uevent_file(udev_device);
334 return udev_device->devnode_uid;
337 static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid)
341 udev_device->devnode_uid = uid;
342 snprintf(num, sizeof(num), "%u", uid);
343 udev_device_add_property(udev_device, "DEVUID", num);
347 gid_t udev_device_get_devnode_gid(struct udev_device *udev_device)
349 if (!udev_device->info_loaded)
350 udev_device_read_uevent_file(udev_device);
351 return udev_device->devnode_gid;
354 static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid)
358 udev_device->devnode_gid = gid;
359 snprintf(num, sizeof(num), "%u", gid);
360 udev_device_add_property(udev_device, "DEVGID", num);
364 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
366 udev_device->envp_uptodate = false;
368 struct udev_list_entry *list_entry;
370 list_entry = udev_device_get_properties_list_entry(udev_device);
371 list_entry = udev_list_entry_get_by_name(list_entry, key);
372 if (list_entry != NULL)
373 udev_list_entry_delete(list_entry);
376 return udev_list_entry_add(&udev_device->properties_list, key, value);
379 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
381 char name[UTIL_LINE_SIZE];
384 strscpy(name, sizeof(name), property);
385 val = strchr(name, '=');
392 return udev_device_add_property(udev_device, name, val);
396 * parse property string, and if needed, update internal values accordingly
398 * udev_device_add_property_from_string_parse_finish() needs to be
399 * called after adding properties, and its return value checked
401 * udev_device_set_info_loaded() needs to be set, to avoid trying
402 * to use a device without a DEVPATH set
404 void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
406 if (startswith(property, "DEVPATH=")) {
407 char path[UTIL_PATH_SIZE];
409 strscpyl(path, sizeof(path), "/sys", &property[8], NULL);
410 udev_device_set_syspath(udev_device, path);
411 } else if (startswith(property, "SUBSYSTEM=")) {
412 udev_device_set_subsystem(udev_device, &property[10]);
413 } else if (startswith(property, "DEVTYPE=")) {
414 udev_device_set_devtype(udev_device, &property[8]);
415 } else if (startswith(property, "DEVNAME=")) {
416 udev_device_set_devnode(udev_device, &property[8]);
417 } else if (startswith(property, "DEVLINKS=")) {
418 char devlinks[UTIL_PATH_SIZE];
422 strscpy(devlinks, sizeof(devlinks), &property[9]);
424 next = strchr(slink, ' ');
425 while (next != NULL) {
427 udev_device_add_devlink(udev_device, slink);
429 next = strchr(slink, ' ');
431 if (slink[0] != '\0')
432 udev_device_add_devlink(udev_device, slink);
433 } else if (startswith(property, "TAGS=")) {
434 char tags[UTIL_PATH_SIZE];
437 strscpy(tags, sizeof(tags), &property[5]);
438 next = strchr(tags, ':');
441 while (next[0] != '\0') {
445 next = strchr(tag, ':');
450 udev_device_add_tag(udev_device, tag);
453 } else if (startswith(property, "USEC_INITIALIZED=")) {
454 udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
455 } else if (startswith(property, "DRIVER=")) {
456 udev_device_set_driver(udev_device, &property[7]);
457 } else if (startswith(property, "ACTION=")) {
458 udev_device_set_action(udev_device, &property[7]);
459 } else if (startswith(property, "MAJOR=")) {
460 udev_device->maj = strtoull(&property[6], NULL, 10);
461 } else if (startswith(property, "MINOR=")) {
462 udev_device->min = strtoull(&property[6], NULL, 10);
463 } else if (startswith(property, "DEVPATH_OLD=")) {
464 udev_device_set_devpath_old(udev_device, &property[12]);
465 } else if (startswith(property, "SEQNUM=")) {
466 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
467 } else if (startswith(property, "IFINDEX=")) {
468 udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
469 } else if (startswith(property, "DEVMODE=")) {
470 udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
471 } else if (startswith(property, "DEVUID=")) {
472 udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10));
473 } else if (startswith(property, "DEVGID=")) {
474 udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10));
476 udev_device_add_property_from_string(udev_device, property);
480 int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
482 if (udev_device->maj > 0)
483 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
484 udev_device->maj = 0;
485 udev_device->min = 0;
487 if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
493 * udev_device_get_property_value:
494 * @udev_device: udev device
495 * @key: property name
497 * Get the value of a given property.
499 * Returns: the property string, or #NULL if there is no such property.
501 _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
503 struct udev_list_entry *list_entry;
505 if (udev_device == NULL)
510 list_entry = udev_device_get_properties_list_entry(udev_device);
511 list_entry = udev_list_entry_get_by_name(list_entry, key);
512 return udev_list_entry_get_value(list_entry);
515 int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
517 char filename[UTIL_PATH_SIZE];
518 char line[UTIL_LINE_SIZE];
521 /* providing a database file will always force-load it */
522 if (dbfile == NULL) {
525 if (udev_device->db_loaded)
527 udev_device->db_loaded = true;
529 id = udev_device_get_id_filename(udev_device);
532 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
536 f = fopen(dbfile, "re");
538 udev_dbg(udev_device->udev, "no db file to read %s: %m\n", dbfile);
542 /* devices with a database entry are initialized */
543 udev_device->is_initialized = true;
545 while (fgets(line, sizeof(line), f)) {
548 struct udev_list_entry *entry;
557 strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
558 udev_device_add_devlink(udev_device, filename);
561 udev_device_set_devlink_priority(udev_device, atoi(val));
564 entry = udev_device_add_property_from_string(udev_device, val);
565 udev_list_entry_set_num(entry, true);
568 udev_device_add_tag(udev_device, val);
571 udev_device_set_watch_handle(udev_device, atoi(val));
574 udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
580 udev_dbg(udev_device->udev, "device %p filled with db file data\n", udev_device);
584 int udev_device_read_uevent_file(struct udev_device *udev_device)
586 char filename[UTIL_PATH_SIZE];
588 char line[UTIL_LINE_SIZE];
592 if (udev_device->uevent_loaded)
595 strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
596 f = fopen(filename, "re");
599 udev_device->uevent_loaded = true;
601 while (fgets(line, sizeof(line), f)) {
604 pos = strchr(line, '\n');
609 if (startswith(line, "DEVTYPE=")) {
610 udev_device_set_devtype(udev_device, &line[8]);
613 if (startswith(line, "IFINDEX=")) {
614 udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
617 if (startswith(line, "DEVNAME=")) {
618 udev_device_set_devnode(udev_device, &line[8]);
622 if (startswith(line, "MAJOR="))
623 maj = strtoull(&line[6], NULL, 10);
624 else if (startswith(line, "MINOR="))
625 min = strtoull(&line[6], NULL, 10);
626 else if (startswith(line, "DEVMODE="))
627 udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
629 udev_device_add_property_from_string(udev_device, line);
632 udev_device->devnum = makedev(maj, min);
637 void udev_device_set_info_loaded(struct udev_device *device)
639 device->info_loaded = true;
642 struct udev_device *udev_device_new(struct udev *udev)
644 struct udev_device *udev_device;
645 struct udev_list_entry *list_entry;
652 udev_device = new0(struct udev_device, 1);
653 if (udev_device == NULL) {
657 udev_device->refcount = 1;
658 udev_device->udev = udev;
659 udev_list_init(udev, &udev_device->devlinks_list, true);
660 udev_list_init(udev, &udev_device->properties_list, true);
661 udev_list_init(udev, &udev_device->sysattr_value_list, true);
662 udev_list_init(udev, &udev_device->sysattr_list, false);
663 udev_list_init(udev, &udev_device->tags_list, true);
664 udev_device->watch_handle = -1;
665 /* copy global properties */
666 udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
667 udev_device_add_property(udev_device,
668 udev_list_entry_get_name(list_entry),
669 udev_list_entry_get_value(list_entry));
674 * udev_device_new_from_syspath:
675 * @udev: udev library context
676 * @syspath: sys device path including sys directory
678 * Create new udev device, and fill in information from the sys
679 * device and the udev database entry. The syspath is the absolute
680 * path to the device, including the sys mount point.
682 * The initial refcount is 1, and needs to be decremented to
683 * release the resources of the udev device.
685 * Returns: a new udev device, or #NULL, if it does not exist
687 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
690 char path[UTIL_PATH_SIZE];
693 struct udev_device *udev_device;
700 if (syspath == NULL) {
705 /* path starts in sys */
706 if (!startswith(syspath, "/sys")) {
707 udev_dbg(udev, "not in sys :%s\n", syspath);
712 /* path is not a root directory */
713 subdir = syspath + strlen("/sys");
714 pos = strrchr(subdir, '/');
715 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
720 /* resolve possible symlink to real path */
721 strscpy(path, sizeof(path), syspath);
722 util_resolve_sys_link(udev, path, sizeof(path));
724 if (startswith(path + strlen("/sys"), "/devices/")) {
725 char file[UTIL_PATH_SIZE];
727 /* all "devices" require a "uevent" file */
728 strscpyl(file, sizeof(file), path, "/uevent", NULL);
729 if (stat(file, &statbuf) != 0)
732 /* everything else just needs to be a directory */
733 if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
737 udev_device = udev_device_new(udev);
738 if (udev_device == NULL)
741 udev_device_set_syspath(udev_device, path);
742 udev_dbg(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
748 * udev_device_new_from_devnum:
749 * @udev: udev library context
750 * @type: char or block device
751 * @devnum: device major/minor number
753 * Create new udev device, and fill in information from the sys
754 * device and the udev database entry. The device is looked-up
755 * by its major/minor number and type. Character and block device
756 * numbers are not unique across the two types.
758 * The initial refcount is 1, and needs to be decremented to
759 * release the resources of the udev device.
761 * Returns: a new udev device, or #NULL, if it does not exist
763 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
765 char path[UTIL_PATH_SIZE];
766 const char *type_str;
770 else if (type == 'c')
777 /* use /sys/dev/{block,char}/<maj>:<min> link */
778 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
779 type_str, major(devnum), minor(devnum));
780 return udev_device_new_from_syspath(udev, path);
784 * udev_device_new_from_device_id:
785 * @udev: udev library context
786 * @id: text string identifying a kernel device
788 * Create new udev device, and fill in information from the sys
789 * device and the udev database entry. The device is looked-up
790 * by a special string:
791 * b8:2 - block device major:minor
792 * c128:1 - char device major:minor
793 * n3 - network device ifindex
794 * +sound:card29 - kernel driver core subsystem:device name
796 * The initial refcount is 1, and needs to be decremented to
797 * release the resources of the udev device.
799 * Returns: a new udev device, or #NULL, if it does not exist
801 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
805 char subsys[UTIL_PATH_SIZE];
811 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
813 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
817 struct udev_device *dev;
820 ifindex = strtoul(&id[1], NULL, 10);
826 sk = socket(PF_INET, SOCK_DGRAM, 0);
829 memzero(&ifr, sizeof(struct ifreq));
830 ifr.ifr_ifindex = ifindex;
831 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
837 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
840 if (udev_device_get_ifindex(dev) == ifindex)
843 /* this is racy, so we may end up with the wrong device */
844 udev_device_unref(dev);
849 strscpy(subsys, sizeof(subsys), &id[1]);
850 sysname = strchr(subsys, ':');
851 if (sysname == NULL) {
856 sysname = &sysname[1];
857 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
865 * udev_device_new_from_subsystem_sysname:
866 * @udev: udev library context
867 * @subsystem: the subsystem of the device
868 * @sysname: the name of the device
870 * Create new udev device, and fill in information from the sys device
871 * and the udev database entry. The device is looked up by the subsystem
872 * and name string of the device, like "mem" / "zero", or "block" / "sda".
874 * The initial refcount is 1, and needs to be decremented to
875 * release the resources of the udev device.
877 * Returns: a new udev device, or #NULL, if it does not exist
879 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
881 char path[UTIL_PATH_SIZE];
884 if (streq(subsystem, "subsystem")) {
885 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
886 if (stat(path, &statbuf) == 0)
889 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
890 if (stat(path, &statbuf) == 0)
893 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
894 if (stat(path, &statbuf) == 0)
899 if (streq(subsystem, "module")) {
900 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
901 if (stat(path, &statbuf) == 0)
906 if (streq(subsystem, "drivers")) {
907 char subsys[UTIL_NAME_SIZE];
910 strscpy(subsys, sizeof(subsys), sysname);
911 driver = strchr(subsys, ':');
912 if (driver != NULL) {
916 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
917 if (stat(path, &statbuf) == 0)
920 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
921 if (stat(path, &statbuf) == 0)
929 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
930 if (stat(path, &statbuf) == 0)
933 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
934 if (stat(path, &statbuf) == 0)
937 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
938 if (stat(path, &statbuf) == 0)
943 return udev_device_new_from_syspath(udev, path);
947 * udev_device_new_from_environment
948 * @udev: udev library context
950 * Create new udev device, and fill in information from the
951 * current process environment. This only works reliable if
952 * the process is called from a udev rule. It is usually used
953 * for tools executed from IMPORT= rules.
955 * The initial refcount is 1, and needs to be decremented to
956 * release the resources of the udev device.
958 * Returns: a new udev device, or #NULL, if it does not exist
960 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
963 struct udev_device *udev_device;
965 udev_device = udev_device_new(udev);
966 if (udev_device == NULL)
968 udev_device_set_info_loaded(udev_device);
970 for (i = 0; environ[i] != NULL; i++)
971 udev_device_add_property_from_string_parse(udev_device, environ[i]);
973 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
974 udev_dbg(udev, "missing values, invalid device\n");
975 udev_device_unref(udev_device);
982 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
984 struct udev_device *udev_device_parent = NULL;
985 char path[UTIL_PATH_SIZE];
988 strscpy(path, sizeof(path), udev_device->syspath);
989 subdir = path + strlen("/sys/");
993 pos = strrchr(subdir, '/');
994 if (pos == NULL || pos < &subdir[2])
997 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
998 if (udev_device_parent != NULL)
999 return udev_device_parent;
1007 * udev_device_get_parent:
1008 * @udev_device: the device to start searching from
1010 * Find the next parent device, and fill in information from the sys
1011 * device and the udev database entry.
1013 * Returned device is not referenced. It is attached to the child
1014 * device, and will be cleaned up when the child device is cleaned up.
1016 * It is not necessarily just the upper level directory, empty or not
1017 * recognized sys directories are ignored.
1019 * It can be called as many times as needed, without caring about
1022 * Returns: a new udev device, or #NULL, if it no parent exist.
1024 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
1026 if (udev_device == NULL) {
1030 if (!udev_device->parent_set) {
1031 udev_device->parent_set = true;
1032 udev_device->parent_device = device_new_from_parent(udev_device);
1034 return udev_device->parent_device;
1038 * udev_device_get_parent_with_subsystem_devtype:
1039 * @udev_device: udev device to start searching from
1040 * @subsystem: the subsystem of the device
1041 * @devtype: the type (DEVTYPE) of the device
1043 * Find the next parent device, with a matching subsystem and devtype
1044 * value, and fill in information from the sys device and the udev
1047 * If devtype is #NULL, only subsystem is checked, and any devtype will
1050 * Returned device is not referenced. It is attached to the child
1051 * device, and will be cleaned up when the child device is cleaned up.
1053 * It can be called as many times as needed, without caring about
1056 * Returns: a new udev device, or #NULL if no matching parent exists.
1058 _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
1060 struct udev_device *parent;
1062 if (subsystem == NULL) {
1067 parent = udev_device_get_parent(udev_device);
1068 while (parent != NULL) {
1069 const char *parent_subsystem;
1070 const char *parent_devtype;
1072 parent_subsystem = udev_device_get_subsystem(parent);
1073 if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
1074 if (devtype == NULL)
1076 parent_devtype = udev_device_get_devtype(parent);
1077 if (parent_devtype != NULL && streq(parent_devtype, devtype))
1080 parent = udev_device_get_parent(parent);
1090 * udev_device_get_udev:
1091 * @udev_device: udev device
1093 * Retrieve the udev library context the device was created with.
1095 * Returns: the udev library context
1097 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
1099 if (udev_device == NULL)
1101 return udev_device->udev;
1106 * @udev_device: udev device
1108 * Take a reference of a udev device.
1110 * Returns: the passed udev device
1112 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
1114 if (udev_device == NULL)
1116 udev_device->refcount++;
1121 * udev_device_unref:
1122 * @udev_device: udev device
1124 * Drop a reference of a udev device. If the refcount reaches zero,
1125 * the resources of the device will be released.
1129 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
1131 if (udev_device == NULL)
1133 udev_device->refcount--;
1134 if (udev_device->refcount > 0)
1136 if (udev_device->parent_device != NULL)
1137 udev_device_unref(udev_device->parent_device);
1138 free(udev_device->syspath);
1139 free(udev_device->sysname);
1140 free(udev_device->devnode);
1141 free(udev_device->subsystem);
1142 free(udev_device->devtype);
1143 udev_list_cleanup(&udev_device->devlinks_list);
1144 udev_list_cleanup(&udev_device->properties_list);
1145 udev_list_cleanup(&udev_device->sysattr_value_list);
1146 udev_list_cleanup(&udev_device->sysattr_list);
1147 udev_list_cleanup(&udev_device->tags_list);
1148 free(udev_device->action);
1149 free(udev_device->driver);
1150 free(udev_device->devpath_old);
1151 free(udev_device->id_filename);
1152 free(udev_device->envp);
1153 free(udev_device->monitor_buf);
1159 * udev_device_get_devpath:
1160 * @udev_device: udev device
1162 * Retrieve the kernel devpath value of the udev device. The path
1163 * does not contain the sys mount point, and starts with a '/'.
1165 * Returns: the devpath of the udev device
1167 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
1169 if (udev_device == NULL)
1171 return udev_device->devpath;
1175 * udev_device_get_syspath:
1176 * @udev_device: udev device
1178 * Retrieve the sys path of the udev device. The path is an
1179 * absolute path and starts with the sys mount point.
1181 * Returns: the sys path of the udev device
1183 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
1185 if (udev_device == NULL)
1187 return udev_device->syspath;
1191 * udev_device_get_sysname:
1192 * @udev_device: udev device
1194 * Get the kernel device name in /sys.
1196 * Returns: the name string of the device device
1198 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
1200 if (udev_device == NULL)
1202 return udev_device->sysname;
1206 * udev_device_get_sysnum:
1207 * @udev_device: udev device
1209 * Get the instance number of the device.
1211 * Returns: the trailing number string of the device name
1213 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
1215 if (udev_device == NULL)
1217 return udev_device->sysnum;
1221 * udev_device_get_devnode:
1222 * @udev_device: udev device
1224 * Retrieve the device node file name belonging to the udev device.
1225 * The path is an absolute path, and starts with the device directory.
1227 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1229 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
1231 if (udev_device == NULL)
1233 if (udev_device->devnode != NULL)
1234 return udev_device->devnode;
1235 if (!udev_device->info_loaded)
1236 udev_device_read_uevent_file(udev_device);
1237 return udev_device->devnode;
1241 * udev_device_get_devlinks_list_entry:
1242 * @udev_device: udev device
1244 * Retrieve the list of device links pointing to the device file of
1245 * the udev device. The next list entry can be retrieved with
1246 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1247 * The devlink path can be retrieved from the list entry by
1248 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1249 * the device directory.
1251 * Returns: the first entry of the device node link list
1253 _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
1255 if (udev_device == NULL)
1257 if (!udev_device->info_loaded)
1258 udev_device_read_db(udev_device, NULL);
1259 return udev_list_get_entry(&udev_device->devlinks_list);
1262 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
1264 udev_device->devlinks_uptodate = false;
1265 udev_list_cleanup(&udev_device->devlinks_list);
1269 * udev_device_get_properties_list_entry:
1270 * @udev_device: udev device
1272 * Retrieve the list of key/value device properties of the udev
1273 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1274 * which returns #NULL if no more entries exist. The property name
1275 * can be retrieved from the list entry by udev_list_entry_get_name(),
1276 * the property value by udev_list_entry_get_value().
1278 * Returns: the first entry of the property list
1280 _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
1282 if (udev_device == NULL)
1284 if (!udev_device->info_loaded) {
1285 udev_device_read_uevent_file(udev_device);
1286 udev_device_read_db(udev_device, NULL);
1288 if (!udev_device->devlinks_uptodate) {
1289 char symlinks[UTIL_PATH_SIZE];
1290 struct udev_list_entry *list_entry;
1292 udev_device->devlinks_uptodate = true;
1293 list_entry = udev_device_get_devlinks_list_entry(udev_device);
1294 if (list_entry != NULL) {
1299 l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
1300 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
1301 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1302 udev_device_add_property(udev_device, "DEVLINKS", symlinks);
1305 if (!udev_device->tags_uptodate) {
1306 udev_device->tags_uptodate = true;
1307 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1308 char tags[UTIL_PATH_SIZE];
1309 struct udev_list_entry *list_entry;
1314 l = strpcpyl(&s, sizeof(tags), ":", NULL);
1315 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1316 l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1317 udev_device_add_property(udev_device, "TAGS", tags);
1320 return udev_list_get_entry(&udev_device->properties_list);
1324 * udev_device_get_action:
1325 * @udev_device: udev device
1327 * This is only valid if the device was received through a monitor. Devices read from
1328 * sys do not have an action string. Usual actions are: add, remove, change, online,
1331 * Returns: the kernel action value, or #NULL if there is no action value available.
1333 _public_ const char *udev_device_get_action(struct udev_device *udev_device)
1335 if (udev_device == NULL)
1337 return udev_device->action;
1341 * udev_device_get_usec_since_initialized:
1342 * @udev_device: udev device
1344 * Return the number of microseconds passed since udev set up the
1345 * device for the first time.
1347 * This is only implemented for devices with need to store properties
1348 * in the udev database. All other devices return 0 here.
1350 * Returns: the number of microseconds since the device was first seen.
1352 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
1356 if (udev_device == NULL)
1358 if (!udev_device->info_loaded)
1359 udev_device_read_db(udev_device, NULL);
1360 if (udev_device->usec_initialized == 0)
1362 now_ts = now(CLOCK_MONOTONIC);
1365 return now_ts - udev_device->usec_initialized;
1368 usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
1370 return udev_device->usec_initialized;
1373 void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
1377 udev_device->usec_initialized = usec_initialized;
1378 snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
1379 udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
1383 * udev_device_get_sysattr_value:
1384 * @udev_device: udev device
1385 * @sysattr: attribute name
1387 * The retrieved value is cached in the device. Repeated calls will return the same
1388 * value and not open the attribute again.
1390 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1392 _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1394 struct udev_list_entry *list_entry;
1395 char path[UTIL_PATH_SIZE];
1397 struct stat statbuf;
1400 const char *val = NULL;
1402 if (udev_device == NULL)
1404 if (sysattr == NULL)
1407 /* look for possibly already cached result */
1408 list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
1409 list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
1410 if (list_entry != NULL)
1411 return udev_list_entry_get_value(list_entry);
1413 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1414 if (lstat(path, &statbuf) != 0) {
1415 udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
1419 if (S_ISLNK(statbuf.st_mode)) {
1421 * Some core links return only the last element of the target path,
1422 * these are just values, the paths should not be exposed.
1424 if (streq(sysattr, "driver") ||
1425 streq(sysattr, "subsystem") ||
1426 streq(sysattr, "module")) {
1427 if (util_get_sys_core_link_value(udev_device->udev, sysattr,
1428 udev_device->syspath, value, sizeof(value)) < 0)
1430 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1431 val = udev_list_entry_get_value(list_entry);
1438 /* skip directories */
1439 if (S_ISDIR(statbuf.st_mode))
1442 /* skip non-readable files */
1443 if ((statbuf.st_mode & S_IRUSR) == 0)
1446 /* read attribute value */
1447 fd = open(path, O_RDONLY|O_CLOEXEC);
1450 size = read(fd, value, sizeof(value));
1454 if (size == sizeof(value))
1457 /* got a valid value, store it in cache and return it */
1459 util_remove_trailing_chars(value, '\n');
1460 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1461 val = udev_list_entry_get_value(list_entry);
1467 * udev_device_set_sysattr_value:
1468 * @udev_device: udev device
1469 * @sysattr: attribute name
1470 * @value: new value to be set
1472 * Update the contents of the sys attribute and the cached value of the device.
1474 * Returns: Negative error code on failure or 0 on success.
1476 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
1478 struct udev_device *dev;
1479 char path[UTIL_PATH_SIZE];
1480 struct stat statbuf;
1482 ssize_t size, value_len;
1485 if (udev_device == NULL)
1488 if (sysattr == NULL)
1493 value_len = strlen(value);
1495 strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
1496 if (lstat(path, &statbuf) != 0) {
1497 udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
1502 if (S_ISLNK(statbuf.st_mode)) {
1507 /* skip directories */
1508 if (S_ISDIR(statbuf.st_mode)) {
1513 /* skip non-readable files */
1514 if ((statbuf.st_mode & S_IRUSR) == 0) {
1519 /* Value is limited to 4k */
1520 if (value_len > 4096) {
1524 util_remove_trailing_chars(value, '\n');
1526 /* write attribute value */
1527 fd = open(path, O_WRONLY|O_CLOEXEC);
1532 size = write(fd, value, value_len);
1538 if (size < value_len) {
1543 /* wrote a valid value, store it in cache and return it */
1544 udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
1546 if (dev != udev_device)
1547 udev_device_unref(dev);
1551 static int udev_device_sysattr_list_read(struct udev_device *udev_device)
1553 struct dirent *dent;
1557 if (udev_device == NULL)
1559 if (udev_device->sysattr_list_read)
1562 dir = opendir(udev_device_get_syspath(udev_device));
1566 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1567 char path[UTIL_PATH_SIZE];
1568 struct stat statbuf;
1570 /* only handle symlinks and regular files */
1571 if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
1574 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
1575 if (lstat(path, &statbuf) != 0)
1577 if ((statbuf.st_mode & S_IRUSR) == 0)
1580 udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
1585 udev_device->sysattr_list_read = true;
1591 * udev_device_get_sysattr_list_entry:
1592 * @udev_device: udev device
1594 * Retrieve the list of available sysattrs, with value being empty;
1595 * This just return all available sysfs attributes for a particular
1596 * device without reading their values.
1598 * Returns: the first entry of the property list
1600 _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
1602 if (!udev_device->sysattr_list_read) {
1604 ret = udev_device_sysattr_list_read(udev_device);
1609 return udev_list_get_entry(&udev_device->sysattr_list);
1612 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
1617 free(udev_device->syspath);
1618 udev_device->syspath = strdup(syspath);
1619 if (udev_device->syspath == NULL)
1621 udev_device->devpath = udev_device->syspath + strlen("/sys");
1622 udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
1624 pos = strrchr(udev_device->syspath, '/');
1627 udev_device->sysname = strdup(&pos[1]);
1628 if (udev_device->sysname == NULL)
1631 /* some devices have '!' in their name, change that to '/' */
1633 while (udev_device->sysname[len] != '\0') {
1634 if (udev_device->sysname[len] == '!')
1635 udev_device->sysname[len] = '/';
1639 /* trailing number */
1640 while (len > 0 && isdigit(udev_device->sysname[--len]))
1641 udev_device->sysnum = &udev_device->sysname[len];
1643 /* sysname is completely numeric */
1645 udev_device->sysnum = NULL;
1650 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1652 free(udev_device->devnode);
1653 if (devnode[0] != '/') {
1654 if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
1655 udev_device->devnode = NULL;
1657 udev_device->devnode = strdup(devnode);
1659 if (udev_device->devnode == NULL)
1661 udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
1665 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1667 struct udev_list_entry *list_entry;
1669 udev_device->devlinks_uptodate = false;
1670 list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
1671 if (list_entry == NULL)
1676 const char *udev_device_get_id_filename(struct udev_device *udev_device)
1678 if (udev_device->id_filename == NULL) {
1679 if (udev_device_get_subsystem(udev_device) == NULL)
1682 if (major(udev_device_get_devnum(udev_device)) > 0) {
1683 /* use dev_t -- b259:131072, c254:0 */
1684 if (asprintf(&udev_device->id_filename, "%c%u:%u",
1685 streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c',
1686 major(udev_device_get_devnum(udev_device)),
1687 minor(udev_device_get_devnum(udev_device))) < 0)
1688 udev_device->id_filename = NULL;
1689 } else if (udev_device_get_ifindex(udev_device) > 0) {
1690 /* use netdev ifindex -- n3 */
1691 if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0)
1692 udev_device->id_filename = NULL;
1695 * use $subsys:$syname -- pci:0000:00:1f.2
1696 * sysname() has '!' translated, get it from devpath
1698 const char *sysname;
1699 sysname = strrchr(udev_device->devpath, '/');
1700 if (sysname == NULL)
1702 sysname = &sysname[1];
1703 if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
1704 udev_device->id_filename = NULL;
1707 return udev_device->id_filename;
1711 * udev_device_get_is_initialized:
1712 * @udev_device: udev device
1714 * Check if udev has already handled the device and has set up
1715 * device node permissions and context, or has renamed a network
1718 * This is only implemented for devices with a device node
1719 * or network interfaces. All other devices return 1 here.
1721 * Returns: 1 if the device is set up. 0 otherwise.
1723 _public_ int udev_device_get_is_initialized(struct udev_device *udev_device)
1725 if (!udev_device->info_loaded)
1726 udev_device_read_db(udev_device, NULL);
1727 return udev_device->is_initialized;
1730 void udev_device_set_is_initialized(struct udev_device *udev_device)
1732 udev_device->is_initialized = true;
1735 static bool is_valid_tag(const char *tag)
1737 return !strchr(tag, ':') && !strchr(tag, ' ');
1740 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1742 if (!is_valid_tag(tag))
1744 udev_device->tags_uptodate = false;
1745 if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
1750 void udev_device_remove_tag(struct udev_device *udev_device, const char *tag)
1752 struct udev_list_entry *e;
1754 if (!is_valid_tag(tag))
1756 e = udev_list_get_entry(&udev_device->tags_list);
1757 e = udev_list_entry_get_by_name(e, tag);
1759 udev_device->tags_uptodate = false;
1760 udev_list_entry_delete(e);
1764 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1766 udev_device->tags_uptodate = false;
1767 udev_list_cleanup(&udev_device->tags_list);
1771 * udev_device_get_tags_list_entry:
1772 * @udev_device: udev device
1774 * Retrieve the list of tags attached to the udev device. The next
1775 * list entry can be retrieved with udev_list_entry_get_next(),
1776 * which returns #NULL if no more entries exist. The tag string
1777 * can be retrieved from the list entry by udev_list_entry_get_name().
1779 * Returns: the first entry of the tag list
1781 _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1783 if (udev_device == NULL)
1785 if (!udev_device->info_loaded)
1786 udev_device_read_db(udev_device, NULL);
1787 return udev_list_get_entry(&udev_device->tags_list);
1791 * udev_device_has_tag:
1792 * @udev_device: udev device
1795 * Check if a given device has a certain tag associated.
1797 * Returns: 1 if the tag is found. 0 otherwise.
1799 _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1801 struct udev_list_entry *list_entry;
1803 if (udev_device == NULL)
1805 if (!udev_device->info_loaded)
1806 udev_device_read_db(udev_device, NULL);
1807 list_entry = udev_device_get_tags_list_entry(udev_device);
1808 if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
1813 #define ENVP_SIZE 128
1814 #define MONITOR_BUF_SIZE 4096
1815 static int update_envp_monitor_buf(struct udev_device *udev_device)
1817 struct udev_list_entry *list_entry;
1822 /* monitor buffer of property strings */
1823 free(udev_device->monitor_buf);
1824 udev_device->monitor_buf_len = 0;
1825 udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1826 if (udev_device->monitor_buf == NULL)
1829 /* envp array, strings will point into monitor buffer */
1830 if (udev_device->envp == NULL)
1831 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1832 if (udev_device->envp == NULL)
1836 s = udev_device->monitor_buf;
1837 l = MONITOR_BUF_SIZE;
1838 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1841 key = udev_list_entry_get_name(list_entry);
1842 /* skip private variables */
1846 /* add string to envp array */
1847 udev_device->envp[i++] = s;
1848 if (i+1 >= ENVP_SIZE)
1851 /* add property string to monitor buffer */
1852 l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1855 /* advance past the trailing '\0' that strpcpyl() guarantees */
1859 udev_device->envp[i] = NULL;
1860 udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1861 udev_device->envp_uptodate = true;
1865 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1867 if (!udev_device->envp_uptodate)
1868 if (update_envp_monitor_buf(udev_device) != 0)
1870 return udev_device->envp;
1873 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1875 if (!udev_device->envp_uptodate)
1876 if (update_envp_monitor_buf(udev_device) != 0)
1878 *buf = udev_device->monitor_buf;
1879 return udev_device->monitor_buf_len;
1882 int udev_device_set_action(struct udev_device *udev_device, const char *action)
1884 free(udev_device->action);
1885 udev_device->action = strdup(action);
1886 if (udev_device->action == NULL)
1888 udev_device_add_property(udev_device, "ACTION", udev_device->action);
1892 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1894 if (!udev_device->info_loaded)
1895 udev_device_read_db(udev_device, NULL);
1896 return udev_device->devlink_priority;
1899 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1901 udev_device->devlink_priority = prio;
1905 int udev_device_get_watch_handle(struct udev_device *udev_device)
1907 if (!udev_device->info_loaded)
1908 udev_device_read_db(udev_device, NULL);
1909 return udev_device->watch_handle;
1912 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1914 udev_device->watch_handle = handle;
1918 bool udev_device_get_db_persist(struct udev_device *udev_device)
1920 return udev_device->db_persist;
1923 void udev_device_set_db_persist(struct udev_device *udev_device)
1925 udev_device->db_persist = true;