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_read_uevent_file(struct udev_device *udev_device);
40 static int udev_device_read_db(struct udev_device *udev_device);
41 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode);
42 static struct udev_list_entry *udev_device_add_property_internal(struct udev_device *udev_device, const char *key, const char *value);
45 * SECTION:libudev-device
46 * @short_description: kernel sys devices
48 * Representation of kernel sys devices. Devices are uniquely identified
49 * by their syspath, every device has exactly one path in the kernel sys
50 * filesystem. Devices usually belong to a kernel subsystem, and have
51 * a unique name inside that subsystem.
57 * Opaque object representing one kernel sys device.
61 struct udev_device *parent_device;
78 size_t monitor_buf_len;
79 struct udev_list devlinks_list;
80 struct udev_list properties_list;
81 struct udev_list sysattr_value_list;
82 struct udev_list sysattr_list;
83 struct udev_list tags_list;
84 unsigned long long int seqnum;
85 usec_t usec_initialized;
95 bool devlinks_uptodate;
103 bool sysattr_list_read;
108 * udev_device_get_seqnum:
109 * @udev_device: udev device
111 * This is only valid if the device was received through a monitor. Devices read from
112 * sys do not have a sequence number.
114 * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
116 _public_ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
118 if (udev_device == NULL)
120 return udev_device->seqnum;
123 static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
127 udev_device->seqnum = seqnum;
128 snprintf(num, sizeof(num), "%llu", seqnum);
129 udev_device_add_property_internal(udev_device, "SEQNUM", num);
133 int udev_device_get_ifindex(struct udev_device *udev_device)
135 if (!udev_device->info_loaded)
136 udev_device_read_uevent_file(udev_device);
137 return udev_device->ifindex;
140 static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
144 udev_device->ifindex = ifindex;
145 snprintf(num, sizeof(num), "%d", ifindex);
146 udev_device_add_property_internal(udev_device, "IFINDEX", num);
151 * udev_device_get_devnum:
152 * @udev_device: udev device
154 * Get the device major/minor number.
156 * Returns: the dev_t number.
158 _public_ dev_t udev_device_get_devnum(struct udev_device *udev_device)
160 if (udev_device == NULL)
161 return makedev(0, 0);
162 if (!udev_device->info_loaded)
163 udev_device_read_uevent_file(udev_device);
164 return udev_device->devnum;
167 static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
171 udev_device->devnum = devnum;
173 snprintf(num, sizeof(num), "%u", major(devnum));
174 udev_device_add_property_internal(udev_device, "MAJOR", num);
175 snprintf(num, sizeof(num), "%u", minor(devnum));
176 udev_device_add_property_internal(udev_device, "MINOR", num);
180 const char *udev_device_get_devpath_old(struct udev_device *udev_device)
182 return udev_device->devpath_old;
185 static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
189 free(udev_device->devpath_old);
190 udev_device->devpath_old = strdup(devpath_old);
191 if (udev_device->devpath_old == NULL)
193 udev_device_add_property_internal(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
195 pos = strrchr(udev_device->devpath_old, '/');
202 * udev_device_get_driver:
203 * @udev_device: udev device
205 * Get the kernel driver name.
207 * Returns: the driver name string, or #NULL if there is no driver attached.
209 _public_ const char *udev_device_get_driver(struct udev_device *udev_device)
211 char driver[UTIL_NAME_SIZE];
213 if (udev_device == NULL)
215 if (!udev_device->driver_set) {
216 udev_device->driver_set = true;
217 if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0)
218 udev_device->driver = strdup(driver);
220 return udev_device->driver;
223 static int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
225 free(udev_device->driver);
226 udev_device->driver = strdup(driver);
227 if (udev_device->driver == NULL)
229 udev_device->driver_set = true;
230 udev_device_add_property_internal(udev_device, "DRIVER", udev_device->driver);
235 * udev_device_get_devtype:
236 * @udev_device: udev device
238 * Retrieve the devtype string of the udev device.
240 * Returns: the devtype name of the udev device, or #NULL if it can not be determined
242 _public_ const char *udev_device_get_devtype(struct udev_device *udev_device)
244 if (udev_device == NULL)
246 if (!udev_device->devtype_set) {
247 udev_device->devtype_set = true;
248 udev_device_read_uevent_file(udev_device);
250 return udev_device->devtype;
253 static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
255 free(udev_device->devtype);
256 udev_device->devtype = strdup(devtype);
257 if (udev_device->devtype == NULL)
259 udev_device->devtype_set = true;
260 udev_device_add_property_internal(udev_device, "DEVTYPE", udev_device->devtype);
264 static int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
266 free(udev_device->subsystem);
267 udev_device->subsystem = strdup(subsystem);
268 if (udev_device->subsystem == NULL)
270 udev_device->subsystem_set = true;
271 udev_device_add_property_internal(udev_device, "SUBSYSTEM", udev_device->subsystem);
276 * udev_device_get_subsystem:
277 * @udev_device: udev device
279 * Retrieve the subsystem string of the udev device. The string does not
282 * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
284 _public_ const char *udev_device_get_subsystem(struct udev_device *udev_device)
286 char subsystem[UTIL_NAME_SIZE];
288 if (udev_device == NULL)
290 if (!udev_device->subsystem_set) {
291 udev_device->subsystem_set = true;
292 /* read "subsystem" link */
293 if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
294 udev_device_set_subsystem(udev_device, subsystem);
295 return udev_device->subsystem;
298 if (startswith(udev_device->devpath, "/module/")) {
299 udev_device_set_subsystem(udev_device, "module");
300 return udev_device->subsystem;
302 if (strstr(udev_device->devpath, "/drivers/") != NULL) {
303 udev_device_set_subsystem(udev_device, "drivers");
304 return udev_device->subsystem;
306 if (startswith(udev_device->devpath, "/subsystem/") ||
307 startswith(udev_device->devpath, "/class/") ||
308 startswith(udev_device->devpath, "/bus/")) {
309 udev_device_set_subsystem(udev_device, "subsystem");
310 return udev_device->subsystem;
313 return udev_device->subsystem;
316 mode_t udev_device_get_devnode_mode(struct udev_device *udev_device)
318 if (!udev_device->info_loaded)
319 udev_device_read_uevent_file(udev_device);
320 return udev_device->devnode_mode;
323 static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode)
327 udev_device->devnode_mode = mode;
328 snprintf(num, sizeof(num), "%#o", mode);
329 udev_device_add_property_internal(udev_device, "DEVMODE", num);
333 uid_t udev_device_get_devnode_uid(struct udev_device *udev_device)
335 if (!udev_device->info_loaded)
336 udev_device_read_uevent_file(udev_device);
337 return udev_device->devnode_uid;
340 static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid)
344 udev_device->devnode_uid = uid;
345 snprintf(num, sizeof(num), "%u", uid);
346 udev_device_add_property_internal(udev_device, "DEVUID", num);
350 gid_t udev_device_get_devnode_gid(struct udev_device *udev_device)
352 if (!udev_device->info_loaded)
353 udev_device_read_uevent_file(udev_device);
354 return udev_device->devnode_gid;
357 static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid)
361 udev_device->devnode_gid = gid;
362 snprintf(num, sizeof(num), "%u", gid);
363 udev_device_add_property_internal(udev_device, "DEVGID", num);
367 static struct udev_list_entry *udev_device_add_property_internal(struct udev_device *udev_device, const char *key, const char *value)
369 udev_device->envp_uptodate = false;
371 struct udev_list_entry *list_entry;
373 list_entry = udev_device_get_properties_list_entry(udev_device);
374 list_entry = udev_list_entry_get_by_name(list_entry, key);
375 if (list_entry != NULL)
376 udev_list_entry_delete(list_entry);
379 return udev_list_entry_add(&udev_device->properties_list, key, value);
383 int udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
385 struct udev_list_entry *property;
387 property = udev_device_add_property_internal(udev_device, key, value);
389 /* store in db, skip private keys */
391 udev_list_entry_set_num(property, true);
396 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
398 char name[UTIL_LINE_SIZE];
401 strscpy(name, sizeof(name), property);
402 val = strchr(name, '=');
409 return udev_device_add_property_internal(udev_device, name, val);
412 static int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
417 free(udev_device->syspath);
418 udev_device->syspath = strdup(syspath);
419 if (udev_device->syspath == NULL)
421 udev_device->devpath = udev_device->syspath + strlen("/sys");
422 udev_device_add_property_internal(udev_device, "DEVPATH", udev_device->devpath);
424 pos = strrchr(udev_device->syspath, '/');
427 udev_device->sysname = strdup(&pos[1]);
428 if (udev_device->sysname == NULL)
431 /* some devices have '!' in their name, change that to '/' */
433 while (udev_device->sysname[len] != '\0') {
434 if (udev_device->sysname[len] == '!')
435 udev_device->sysname[len] = '/';
439 /* trailing number */
440 while (len > 0 && isdigit(udev_device->sysname[--len]))
441 udev_device->sysnum = &udev_device->sysname[len];
443 /* sysname is completely numeric */
445 udev_device->sysnum = NULL;
450 static void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
452 char num[DECIMAL_STR_MAX(usec_t)];
454 udev_device->usec_initialized = usec_initialized;
455 snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
456 udev_device_add_property_internal(udev_device, "USEC_INITIALIZED", num);
459 void udev_device_ensure_usec_initialized(struct udev_device *udev_device, struct udev_device *old_device)
461 if (old_device && old_device->usec_initialized != 0)
462 udev_device_set_usec_initialized(udev_device, old_device->usec_initialized);
464 udev_device_set_usec_initialized(udev_device, now(CLOCK_MONOTONIC));
467 static int udev_device_set_action(struct udev_device *udev_device, const char *action)
469 free(udev_device->action);
470 udev_device->action = strdup(action);
471 if (udev_device->action == NULL)
473 udev_device_add_property_internal(udev_device, "ACTION", udev_device->action);
478 * parse property string, and if needed, update internal values accordingly
480 * udev_device_add_property_from_string_parse_finish() needs to be
481 * called after adding properties, and its return value checked
483 * udev_device_set_info_loaded() needs to be set, to avoid trying
484 * to use a device without a DEVPATH set
486 static void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
488 if (startswith(property, "DEVPATH=")) {
489 char path[UTIL_PATH_SIZE];
491 strscpyl(path, sizeof(path), "/sys", &property[8], NULL);
492 udev_device_set_syspath(udev_device, path);
493 } else if (startswith(property, "SUBSYSTEM=")) {
494 udev_device_set_subsystem(udev_device, &property[10]);
495 } else if (startswith(property, "DEVTYPE=")) {
496 udev_device_set_devtype(udev_device, &property[8]);
497 } else if (startswith(property, "DEVNAME=")) {
498 udev_device_set_devnode(udev_device, &property[8]);
499 } else if (startswith(property, "DEVLINKS=")) {
500 char devlinks[UTIL_PATH_SIZE];
504 strscpy(devlinks, sizeof(devlinks), &property[9]);
506 next = strchr(slink, ' ');
507 while (next != NULL) {
509 udev_device_add_devlink(udev_device, slink);
511 next = strchr(slink, ' ');
513 if (slink[0] != '\0')
514 udev_device_add_devlink(udev_device, slink);
515 } else if (startswith(property, "TAGS=")) {
516 char tags[UTIL_PATH_SIZE];
519 strscpy(tags, sizeof(tags), &property[5]);
520 next = strchr(tags, ':');
523 while (next[0] != '\0') {
527 next = strchr(tag, ':');
532 udev_device_add_tag(udev_device, tag);
535 } else if (startswith(property, "USEC_INITIALIZED=")) {
536 udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
537 } else if (startswith(property, "DRIVER=")) {
538 udev_device_set_driver(udev_device, &property[7]);
539 } else if (startswith(property, "ACTION=")) {
540 udev_device_set_action(udev_device, &property[7]);
541 } else if (startswith(property, "MAJOR=")) {
542 udev_device->maj = strtoull(&property[6], NULL, 10);
543 } else if (startswith(property, "MINOR=")) {
544 udev_device->min = strtoull(&property[6], NULL, 10);
545 } else if (startswith(property, "DEVPATH_OLD=")) {
546 udev_device_set_devpath_old(udev_device, &property[12]);
547 } else if (startswith(property, "SEQNUM=")) {
548 udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
549 } else if (startswith(property, "IFINDEX=")) {
550 udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
551 } else if (startswith(property, "DEVMODE=")) {
552 udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
553 } else if (startswith(property, "DEVUID=")) {
554 udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10));
555 } else if (startswith(property, "DEVGID=")) {
556 udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10));
558 udev_device_add_property_from_string(udev_device, property);
562 static int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
564 if (udev_device->maj > 0)
565 udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
566 udev_device->maj = 0;
567 udev_device->min = 0;
569 if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
575 * udev_device_get_property_value:
576 * @udev_device: udev device
577 * @key: property name
579 * Get the value of a given property.
581 * Returns: the property string, or #NULL if there is no such property.
583 _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
585 struct udev_list_entry *list_entry;
587 if (udev_device == NULL)
592 list_entry = udev_device_get_properties_list_entry(udev_device);
593 list_entry = udev_list_entry_get_by_name(list_entry, key);
594 return udev_list_entry_get_value(list_entry);
597 static int udev_device_read_db(struct udev_device *udev_device)
599 char filename[UTIL_PATH_SIZE];
600 char line[UTIL_LINE_SIZE];
604 if (udev_device->db_loaded)
607 udev_device->db_loaded = true;
609 id = udev_device_get_id_filename(udev_device);
613 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
615 f = fopen(filename, "re");
617 return log_debug_errno(errno, "no db file to read %s: %m", filename);
619 /* devices with a database entry are initialized */
620 udev_device->is_initialized = true;
622 while (fgets(line, sizeof(line), f)) {
625 struct udev_list_entry *entry;
634 strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
635 udev_device_add_devlink(udev_device, filename);
638 udev_device_set_devlink_priority(udev_device, atoi(val));
641 entry = udev_device_add_property_from_string(udev_device, val);
642 udev_list_entry_set_num(entry, true);
645 udev_device_add_tag(udev_device, val);
648 udev_device_set_watch_handle(udev_device, atoi(val));
651 udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
657 log_trace("device %p filled with db file data", udev_device);
661 static int udev_device_read_uevent_file(struct udev_device *udev_device)
663 char filename[UTIL_PATH_SIZE];
665 char line[UTIL_LINE_SIZE];
669 if (udev_device->uevent_loaded)
672 strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
673 f = fopen(filename, "re");
676 udev_device->uevent_loaded = true;
678 while (fgets(line, sizeof(line), f)) {
681 pos = strchr(line, '\n');
686 if (startswith(line, "DEVTYPE=")) {
687 udev_device_set_devtype(udev_device, &line[8]);
690 if (startswith(line, "IFINDEX=")) {
691 udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
694 if (startswith(line, "DEVNAME=")) {
695 udev_device_set_devnode(udev_device, &line[8]);
699 if (startswith(line, "MAJOR="))
700 maj = strtoull(&line[6], NULL, 10);
701 else if (startswith(line, "MINOR="))
702 min = strtoull(&line[6], NULL, 10);
703 else if (startswith(line, "DEVMODE="))
704 udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
706 udev_device_add_property_from_string(udev_device, line);
709 udev_device->devnum = makedev(maj, min);
714 void udev_device_set_info_loaded(struct udev_device *device)
716 device->info_loaded = true;
719 static struct udev_device *udev_device_new(struct udev *udev)
721 struct udev_device *udev_device;
728 udev_device = new0(struct udev_device, 1);
729 if (udev_device == NULL) {
733 udev_device->refcount = 1;
734 udev_device->udev = udev;
735 udev_list_init(udev, &udev_device->devlinks_list, true);
736 udev_list_init(udev, &udev_device->properties_list, true);
737 udev_list_init(udev, &udev_device->sysattr_value_list, true);
738 udev_list_init(udev, &udev_device->sysattr_list, false);
739 udev_list_init(udev, &udev_device->tags_list, true);
740 udev_device->watch_handle = -1;
746 * udev_device_new_from_syspath:
747 * @udev: udev library context
748 * @syspath: sys device path including sys directory
750 * Create new udev device, and fill in information from the sys
751 * device and the udev database entry. The syspath is the absolute
752 * path to the device, including the sys mount point.
754 * The initial refcount is 1, and needs to be decremented to
755 * release the resources of the udev device.
757 * Returns: a new udev device, or #NULL, if it does not exist
759 _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
762 char path[UTIL_PATH_SIZE];
765 struct udev_device *udev_device;
772 if (syspath == NULL) {
777 /* path starts in sys */
778 if (!startswith(syspath, "/sys")) {
779 log_debug("not in sys :%s", syspath);
784 /* path is not a root directory */
785 subdir = syspath + strlen("/sys");
786 pos = strrchr(subdir, '/');
787 if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
792 /* resolve possible symlink to real path */
793 strscpy(path, sizeof(path), syspath);
794 util_resolve_sys_link(udev, path, sizeof(path));
796 if (startswith(path + strlen("/sys"), "/devices/")) {
797 char file[UTIL_PATH_SIZE];
799 /* all "devices" require a "uevent" file */
800 strscpyl(file, sizeof(file), path, "/uevent", NULL);
801 if (stat(file, &statbuf) != 0)
804 /* everything else just needs to be a directory */
805 if (stat(path, &statbuf) != 0)
808 if (!S_ISDIR(statbuf.st_mode)) {
814 udev_device = udev_device_new(udev);
815 if (udev_device == NULL)
818 udev_device_set_syspath(udev_device, path);
819 log_trace("device %p has devpath '%s'", udev_device, udev_device_get_devpath(udev_device));
825 * udev_device_new_from_devnum:
826 * @udev: udev library context
827 * @type: char or block device
828 * @devnum: device major/minor number
830 * Create new udev device, and fill in information from the sys
831 * device and the udev database entry. The device is looked-up
832 * by its major/minor number and type. Character and block device
833 * numbers are not unique across the two types.
835 * The initial refcount is 1, and needs to be decremented to
836 * release the resources of the udev device.
838 * Returns: a new udev device, or #NULL, if it does not exist
840 _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
842 char path[UTIL_PATH_SIZE];
843 const char *type_str;
847 else if (type == 'c')
854 /* use /sys/dev/{block,char}/<maj>:<min> link */
855 snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
856 type_str, major(devnum), minor(devnum));
857 return udev_device_new_from_syspath(udev, path);
861 * udev_device_new_from_device_id:
862 * @udev: udev library context
863 * @id: text string identifying a kernel device
865 * Create new udev device, and fill in information from the sys
866 * device and the udev database entry. The device is looked-up
867 * by a special string:
868 * b8:2 - block device major:minor
869 * c128:1 - char device major:minor
870 * n3 - network device ifindex
871 * +sound:card29 - kernel driver core subsystem:device name
873 * The initial refcount is 1, and needs to be decremented to
874 * release the resources of the udev device.
876 * Returns: a new udev device, or #NULL, if it does not exist
878 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
882 char subsys[UTIL_PATH_SIZE];
888 if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
890 return udev_device_new_from_devnum(udev, type, makedev(maj, min));
894 struct udev_device *dev;
897 ifindex = strtoul(&id[1], NULL, 10);
903 sk = socket(PF_INET, SOCK_DGRAM, 0);
906 memzero(&ifr, sizeof(struct ifreq));
907 ifr.ifr_ifindex = ifindex;
908 if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
914 dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
917 if (udev_device_get_ifindex(dev) == ifindex)
920 /* this is racy, so we may end up with the wrong device */
921 udev_device_unref(dev);
926 strscpy(subsys, sizeof(subsys), &id[1]);
927 sysname = strchr(subsys, ':');
928 if (sysname == NULL) {
933 sysname = &sysname[1];
934 return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
942 * udev_device_new_from_subsystem_sysname:
943 * @udev: udev library context
944 * @subsystem: the subsystem of the device
945 * @sysname: the name of the device
947 * Create new udev device, and fill in information from the sys device
948 * and the udev database entry. The device is looked up by the subsystem
949 * and name string of the device, like "mem" / "zero", or "block" / "sda".
951 * The initial refcount is 1, and needs to be decremented to
952 * release the resources of the udev device.
954 * Returns: a new udev device, or #NULL, if it does not exist
956 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
958 char path[UTIL_PATH_SIZE];
961 if (streq(subsystem, "subsystem")) {
962 strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
963 if (stat(path, &statbuf) == 0)
966 strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
967 if (stat(path, &statbuf) == 0)
970 strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
971 if (stat(path, &statbuf) == 0)
976 if (streq(subsystem, "module")) {
977 strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
978 if (stat(path, &statbuf) == 0)
983 if (streq(subsystem, "drivers")) {
984 char subsys[UTIL_NAME_SIZE];
987 strscpy(subsys, sizeof(subsys), sysname);
988 driver = strchr(subsys, ':');
989 if (driver != NULL) {
993 strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
994 if (stat(path, &statbuf) == 0)
997 strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
998 if (stat(path, &statbuf) == 0)
1006 strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
1007 if (stat(path, &statbuf) == 0)
1010 strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
1011 if (stat(path, &statbuf) == 0)
1014 strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
1015 if (stat(path, &statbuf) == 0)
1020 return udev_device_new_from_syspath(udev, path);
1024 * udev_device_new_from_environment
1025 * @udev: udev library context
1027 * Create new udev device, and fill in information from the
1028 * current process environment. This only works reliable if
1029 * the process is called from a udev rule. It is usually used
1030 * for tools executed from IMPORT= rules.
1032 * The initial refcount is 1, and needs to be decremented to
1033 * release the resources of the udev device.
1035 * Returns: a new udev device, or #NULL, if it does not exist
1037 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
1040 struct udev_device *udev_device;
1042 udev_device = udev_device_new(udev);
1043 if (udev_device == NULL)
1045 udev_device_set_info_loaded(udev_device);
1047 for (i = 0; environ[i] != NULL; i++)
1048 udev_device_add_property_from_string_parse(udev_device, environ[i]);
1050 if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
1051 log_debug("missing values, invalid device");
1052 udev_device_unref(udev_device);
1059 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
1061 struct udev_device *udev_device_parent = NULL;
1062 char path[UTIL_PATH_SIZE];
1065 strscpy(path, sizeof(path), udev_device->syspath);
1066 subdir = path + strlen("/sys/");
1070 pos = strrchr(subdir, '/');
1071 if (pos == NULL || pos < &subdir[2])
1074 udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
1075 if (udev_device_parent != NULL)
1076 return udev_device_parent;
1084 * udev_device_get_parent:
1085 * @udev_device: the device to start searching from
1087 * Find the next parent device, and fill in information from the sys
1088 * device and the udev database entry.
1090 * Returned device is not referenced. It is attached to the child
1091 * device, and will be cleaned up when the child device is cleaned up.
1093 * It is not necessarily just the upper level directory, empty or not
1094 * recognized sys directories are ignored.
1096 * It can be called as many times as needed, without caring about
1099 * Returns: a new udev device, or #NULL, if it no parent exist.
1101 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
1103 if (udev_device == NULL) {
1107 if (!udev_device->parent_set) {
1108 udev_device->parent_set = true;
1109 udev_device->parent_device = device_new_from_parent(udev_device);
1111 return udev_device->parent_device;
1115 * udev_device_get_parent_with_subsystem_devtype:
1116 * @udev_device: udev device to start searching from
1117 * @subsystem: the subsystem of the device
1118 * @devtype: the type (DEVTYPE) of the device
1120 * Find the next parent device, with a matching subsystem and devtype
1121 * value, and fill in information from the sys device and the udev
1124 * If devtype is #NULL, only subsystem is checked, and any devtype will
1127 * Returned device is not referenced. It is attached to the child
1128 * device, and will be cleaned up when the child device is cleaned up.
1130 * It can be called as many times as needed, without caring about
1133 * Returns: a new udev device, or #NULL if no matching parent exists.
1135 _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
1137 struct udev_device *parent;
1139 if (subsystem == NULL) {
1144 parent = udev_device_get_parent(udev_device);
1145 while (parent != NULL) {
1146 const char *parent_subsystem;
1147 const char *parent_devtype;
1149 parent_subsystem = udev_device_get_subsystem(parent);
1150 if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
1151 if (devtype == NULL)
1153 parent_devtype = udev_device_get_devtype(parent);
1154 if (parent_devtype != NULL && streq(parent_devtype, devtype))
1157 parent = udev_device_get_parent(parent);
1167 * udev_device_get_udev:
1168 * @udev_device: udev device
1170 * Retrieve the udev library context the device was created with.
1172 * Returns: the udev library context
1174 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
1176 if (udev_device == NULL)
1178 return udev_device->udev;
1183 * @udev_device: udev device
1185 * Take a reference of a udev device.
1187 * Returns: the passed udev device
1189 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
1191 if (udev_device == NULL)
1193 udev_device->refcount++;
1198 * udev_device_unref:
1199 * @udev_device: udev device
1201 * Drop a reference of a udev device. If the refcount reaches zero,
1202 * the resources of the device will be released.
1206 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
1208 if (udev_device == NULL)
1210 udev_device->refcount--;
1211 if (udev_device->refcount > 0)
1213 if (udev_device->parent_device != NULL)
1214 udev_device_unref(udev_device->parent_device);
1215 free(udev_device->syspath);
1216 free(udev_device->sysname);
1217 free(udev_device->devnode);
1218 free(udev_device->subsystem);
1219 free(udev_device->devtype);
1220 udev_list_cleanup(&udev_device->devlinks_list);
1221 udev_list_cleanup(&udev_device->properties_list);
1222 udev_list_cleanup(&udev_device->sysattr_value_list);
1223 udev_list_cleanup(&udev_device->sysattr_list);
1224 udev_list_cleanup(&udev_device->tags_list);
1225 free(udev_device->action);
1226 free(udev_device->driver);
1227 free(udev_device->devpath_old);
1228 free(udev_device->id_filename);
1229 free(udev_device->envp);
1230 free(udev_device->monitor_buf);
1236 * udev_device_get_devpath:
1237 * @udev_device: udev device
1239 * Retrieve the kernel devpath value of the udev device. The path
1240 * does not contain the sys mount point, and starts with a '/'.
1242 * Returns: the devpath of the udev device
1244 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
1246 if (udev_device == NULL)
1248 return udev_device->devpath;
1252 * udev_device_get_syspath:
1253 * @udev_device: udev device
1255 * Retrieve the sys path of the udev device. The path is an
1256 * absolute path and starts with the sys mount point.
1258 * Returns: the sys path of the udev device
1260 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
1262 if (udev_device == NULL)
1264 return udev_device->syspath;
1268 * udev_device_get_sysname:
1269 * @udev_device: udev device
1271 * Get the kernel device name in /sys.
1273 * Returns: the name string of the device device
1275 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
1277 if (udev_device == NULL)
1279 return udev_device->sysname;
1283 * udev_device_get_sysnum:
1284 * @udev_device: udev device
1286 * Get the instance number of the device.
1288 * Returns: the trailing number string of the device name
1290 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
1292 if (udev_device == NULL)
1294 return udev_device->sysnum;
1298 * udev_device_get_devnode:
1299 * @udev_device: udev device
1301 * Retrieve the device node file name belonging to the udev device.
1302 * The path is an absolute path, and starts with the device directory.
1304 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1306 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
1308 if (udev_device == NULL)
1310 if (udev_device->devnode != NULL)
1311 return udev_device->devnode;
1312 if (!udev_device->info_loaded)
1313 udev_device_read_uevent_file(udev_device);
1314 return udev_device->devnode;
1318 * udev_device_get_devlinks_list_entry:
1319 * @udev_device: udev device
1321 * Retrieve the list of device links pointing to the device file of
1322 * the udev device. The next list entry can be retrieved with
1323 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1324 * The devlink path can be retrieved from the list entry by
1325 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1326 * the device directory.
1328 * Returns: the first entry of the device node link list
1330 _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
1332 if (udev_device == NULL)
1334 if (!udev_device->info_loaded)
1335 udev_device_read_db(udev_device);
1336 return udev_list_get_entry(&udev_device->devlinks_list);
1339 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
1341 udev_device->devlinks_uptodate = false;
1342 udev_list_cleanup(&udev_device->devlinks_list);
1346 * udev_device_get_properties_list_entry:
1347 * @udev_device: udev device
1349 * Retrieve the list of key/value device properties of the udev
1350 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1351 * which returns #NULL if no more entries exist. The property name
1352 * can be retrieved from the list entry by udev_list_entry_get_name(),
1353 * the property value by udev_list_entry_get_value().
1355 * Returns: the first entry of the property list
1357 _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
1359 if (udev_device == NULL)
1361 if (!udev_device->info_loaded) {
1362 udev_device_read_uevent_file(udev_device);
1363 udev_device_read_db(udev_device);
1365 if (!udev_device->devlinks_uptodate) {
1366 char symlinks[UTIL_PATH_SIZE];
1367 struct udev_list_entry *list_entry;
1369 udev_device->devlinks_uptodate = true;
1370 list_entry = udev_device_get_devlinks_list_entry(udev_device);
1371 if (list_entry != NULL) {
1376 l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
1377 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
1378 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
1379 udev_device_add_property_internal(udev_device, "DEVLINKS", symlinks);
1382 if (!udev_device->tags_uptodate) {
1383 udev_device->tags_uptodate = true;
1384 if (udev_device_get_tags_list_entry(udev_device) != NULL) {
1385 char tags[UTIL_PATH_SIZE];
1386 struct udev_list_entry *list_entry;
1391 l = strpcpyl(&s, sizeof(tags), ":", NULL);
1392 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
1393 l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
1394 udev_device_add_property_internal(udev_device, "TAGS", tags);
1397 return udev_list_get_entry(&udev_device->properties_list);
1401 * udev_device_get_action:
1402 * @udev_device: udev device
1404 * This is only valid if the device was received through a monitor. Devices read from
1405 * sys do not have an action string. Usual actions are: add, remove, change, online,
1408 * Returns: the kernel action value, or #NULL if there is no action value available.
1410 _public_ const char *udev_device_get_action(struct udev_device *udev_device)
1412 if (udev_device == NULL)
1414 return udev_device->action;
1418 * udev_device_get_usec_since_initialized:
1419 * @udev_device: udev device
1421 * Return the number of microseconds passed since udev set up the
1422 * device for the first time.
1424 * This is only implemented for devices with need to store properties
1425 * in the udev database. All other devices return 0 here.
1427 * Returns: the number of microseconds since the device was first seen.
1429 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
1433 if (udev_device == NULL)
1435 if (!udev_device->info_loaded)
1436 udev_device_read_db(udev_device);
1437 if (udev_device->usec_initialized == 0)
1439 now_ts = now(CLOCK_MONOTONIC);
1442 return now_ts - udev_device->usec_initialized;
1445 usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
1447 return udev_device->usec_initialized;
1451 * udev_device_get_sysattr_value:
1452 * @udev_device: udev device
1453 * @sysattr: attribute name
1455 * The retrieved value is cached in the device. Repeated calls will return the same
1456 * value and not open the attribute again.
1458 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1460 _public_ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
1462 struct udev_list_entry *list_entry;
1463 char path[UTIL_PATH_SIZE];
1465 struct stat statbuf;
1468 const char *val = NULL;
1470 if (udev_device == NULL)
1472 if (sysattr == NULL)
1475 /* look for possibly already cached result */
1476 list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
1477 list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
1478 if (list_entry != NULL)
1479 return udev_list_entry_get_value(list_entry);
1481 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
1482 if (lstat(path, &statbuf) != 0) {
1483 udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
1487 if (S_ISLNK(statbuf.st_mode)) {
1489 * Some core links return only the last element of the target path,
1490 * these are just values, the paths should not be exposed.
1492 if (streq(sysattr, "driver") ||
1493 streq(sysattr, "subsystem") ||
1494 streq(sysattr, "module")) {
1495 if (util_get_sys_core_link_value(udev_device->udev, sysattr,
1496 udev_device->syspath, value, sizeof(value)) < 0)
1498 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1499 val = udev_list_entry_get_value(list_entry);
1506 /* skip directories */
1507 if (S_ISDIR(statbuf.st_mode))
1510 /* skip non-readable files */
1511 if ((statbuf.st_mode & S_IRUSR) == 0)
1514 /* read attribute value */
1515 fd = open(path, O_RDONLY|O_CLOEXEC);
1518 size = read(fd, value, sizeof(value));
1522 if (size == sizeof(value))
1525 /* got a valid value, store it in cache and return it */
1527 util_remove_trailing_chars(value, '\n');
1528 list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
1529 val = udev_list_entry_get_value(list_entry);
1535 * udev_device_set_sysattr_value:
1536 * @udev_device: udev device
1537 * @sysattr: attribute name
1538 * @value: new value to be set
1540 * Update the contents of the sys attribute and the cached value of the device.
1542 * Returns: Negative error code on failure or 0 on success.
1544 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
1546 struct udev_device *dev;
1547 char path[UTIL_PATH_SIZE];
1548 struct stat statbuf;
1550 ssize_t size, value_len;
1553 if (udev_device == NULL)
1556 if (sysattr == NULL)
1561 value_len = strlen(value);
1563 strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
1564 if (lstat(path, &statbuf) != 0) {
1565 udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
1570 if (S_ISLNK(statbuf.st_mode)) {
1575 /* skip directories */
1576 if (S_ISDIR(statbuf.st_mode)) {
1581 /* skip non-readable files */
1582 if ((statbuf.st_mode & S_IRUSR) == 0) {
1587 /* Value is limited to 4k */
1588 if (value_len > 4096) {
1592 util_remove_trailing_chars(value, '\n');
1594 /* write attribute value */
1595 fd = open(path, O_WRONLY|O_CLOEXEC);
1600 size = write(fd, value, value_len);
1606 if (size < value_len) {
1611 /* wrote a valid value, store it in cache and return it */
1612 udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
1614 if (dev != udev_device)
1615 udev_device_unref(dev);
1619 static int udev_device_sysattr_list_read(struct udev_device *udev_device)
1621 struct dirent *dent;
1625 if (udev_device == NULL)
1627 if (udev_device->sysattr_list_read)
1630 dir = opendir(udev_device_get_syspath(udev_device));
1634 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
1635 char path[UTIL_PATH_SIZE];
1636 struct stat statbuf;
1638 /* only handle symlinks and regular files */
1639 if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
1642 strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
1643 if (lstat(path, &statbuf) != 0)
1645 if ((statbuf.st_mode & S_IRUSR) == 0)
1648 udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
1653 udev_device->sysattr_list_read = true;
1659 * udev_device_get_sysattr_list_entry:
1660 * @udev_device: udev device
1662 * Retrieve the list of available sysattrs, with value being empty;
1663 * This just return all available sysfs attributes for a particular
1664 * device without reading their values.
1666 * Returns: the first entry of the property list
1668 _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
1670 if (!udev_device->sysattr_list_read) {
1672 ret = udev_device_sysattr_list_read(udev_device);
1677 return udev_list_get_entry(&udev_device->sysattr_list);
1680 static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
1682 free(udev_device->devnode);
1683 if (devnode[0] != '/') {
1684 if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
1685 udev_device->devnode = NULL;
1687 udev_device->devnode = strdup(devnode);
1689 if (udev_device->devnode == NULL)
1691 udev_device_add_property_internal(udev_device, "DEVNAME", udev_device->devnode);
1695 int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
1697 struct udev_list_entry *list_entry;
1699 udev_device->devlinks_uptodate = false;
1700 list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
1701 if (list_entry == NULL)
1706 const char *udev_device_get_id_filename(struct udev_device *udev_device)
1708 if (udev_device->id_filename == NULL) {
1709 if (udev_device_get_subsystem(udev_device) == NULL)
1712 if (major(udev_device_get_devnum(udev_device)) > 0) {
1713 /* use dev_t -- b259:131072, c254:0 */
1714 if (asprintf(&udev_device->id_filename, "%c%u:%u",
1715 streq(udev_device_get_subsystem(udev_device), "block") ? 'b' : 'c',
1716 major(udev_device_get_devnum(udev_device)),
1717 minor(udev_device_get_devnum(udev_device))) < 0)
1718 udev_device->id_filename = NULL;
1719 } else if (udev_device_get_ifindex(udev_device) > 0) {
1720 /* use netdev ifindex -- n3 */
1721 if (asprintf(&udev_device->id_filename, "n%i", udev_device_get_ifindex(udev_device)) < 0)
1722 udev_device->id_filename = NULL;
1725 * use $subsys:$syname -- pci:0000:00:1f.2
1726 * sysname() has '!' translated, get it from devpath
1728 const char *sysname;
1729 sysname = strrchr(udev_device->devpath, '/');
1730 if (sysname == NULL)
1732 sysname = &sysname[1];
1733 if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
1734 udev_device->id_filename = NULL;
1737 return udev_device->id_filename;
1741 * udev_device_get_is_initialized:
1742 * @udev_device: udev device
1744 * Check if udev has already handled the device and has set up
1745 * device node permissions and context, or has renamed a network
1748 * This is only implemented for devices with a device node
1749 * or network interfaces. All other devices return 1 here.
1751 * Returns: 1 if the device is set up. 0 otherwise.
1753 _public_ int udev_device_get_is_initialized(struct udev_device *udev_device)
1755 if (!udev_device->info_loaded)
1756 udev_device_read_db(udev_device);
1757 return udev_device->is_initialized;
1760 void udev_device_set_is_initialized(struct udev_device *udev_device)
1762 udev_device->is_initialized = true;
1765 static bool is_valid_tag(const char *tag)
1767 return !strchr(tag, ':') && !strchr(tag, ' ');
1770 int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
1772 if (!is_valid_tag(tag))
1774 udev_device->tags_uptodate = false;
1775 if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
1780 void udev_device_remove_tag(struct udev_device *udev_device, const char *tag)
1782 struct udev_list_entry *e;
1784 if (!is_valid_tag(tag))
1786 e = udev_list_get_entry(&udev_device->tags_list);
1787 e = udev_list_entry_get_by_name(e, tag);
1789 udev_device->tags_uptodate = false;
1790 udev_list_entry_delete(e);
1794 void udev_device_cleanup_tags_list(struct udev_device *udev_device)
1796 udev_device->tags_uptodate = false;
1797 udev_list_cleanup(&udev_device->tags_list);
1801 * udev_device_get_tags_list_entry:
1802 * @udev_device: udev device
1804 * Retrieve the list of tags attached to the udev device. The next
1805 * list entry can be retrieved with udev_list_entry_get_next(),
1806 * which returns #NULL if no more entries exist. The tag string
1807 * can be retrieved from the list entry by udev_list_entry_get_name().
1809 * Returns: the first entry of the tag list
1811 _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
1813 if (udev_device == NULL)
1815 if (!udev_device->info_loaded)
1816 udev_device_read_db(udev_device);
1817 return udev_list_get_entry(&udev_device->tags_list);
1821 * udev_device_has_tag:
1822 * @udev_device: udev device
1825 * Check if a given device has a certain tag associated.
1827 * Returns: 1 if the tag is found. 0 otherwise.
1829 _public_ int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
1831 struct udev_list_entry *list_entry;
1833 if (udev_device == NULL)
1835 if (!udev_device->info_loaded)
1836 udev_device_read_db(udev_device);
1837 list_entry = udev_device_get_tags_list_entry(udev_device);
1838 if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
1843 #define ENVP_SIZE 128
1844 #define MONITOR_BUF_SIZE 4096
1845 static int update_envp_monitor_buf(struct udev_device *udev_device)
1847 struct udev_list_entry *list_entry;
1852 /* monitor buffer of property strings */
1853 free(udev_device->monitor_buf);
1854 udev_device->monitor_buf_len = 0;
1855 udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
1856 if (udev_device->monitor_buf == NULL)
1859 /* envp array, strings will point into monitor buffer */
1860 if (udev_device->envp == NULL)
1861 udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
1862 if (udev_device->envp == NULL)
1866 s = udev_device->monitor_buf;
1867 l = MONITOR_BUF_SIZE;
1868 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
1871 key = udev_list_entry_get_name(list_entry);
1872 /* skip private variables */
1876 /* add string to envp array */
1877 udev_device->envp[i++] = s;
1878 if (i+1 >= ENVP_SIZE)
1881 /* add property string to monitor buffer */
1882 l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
1885 /* advance past the trailing '\0' that strpcpyl() guarantees */
1889 udev_device->envp[i] = NULL;
1890 udev_device->monitor_buf_len = s - udev_device->monitor_buf;
1891 udev_device->envp_uptodate = true;
1895 char **udev_device_get_properties_envp(struct udev_device *udev_device)
1897 if (!udev_device->envp_uptodate)
1898 if (update_envp_monitor_buf(udev_device) != 0)
1900 return udev_device->envp;
1903 ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
1905 if (!udev_device->envp_uptodate)
1906 if (update_envp_monitor_buf(udev_device) != 0)
1908 *buf = udev_device->monitor_buf;
1909 return udev_device->monitor_buf_len;
1912 int udev_device_get_devlink_priority(struct udev_device *udev_device)
1914 if (!udev_device->info_loaded)
1915 udev_device_read_db(udev_device);
1916 return udev_device->devlink_priority;
1919 int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
1921 udev_device->devlink_priority = prio;
1925 int udev_device_get_watch_handle(struct udev_device *udev_device)
1927 if (!udev_device->info_loaded)
1928 udev_device_read_db(udev_device);
1929 return udev_device->watch_handle;
1932 int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
1934 udev_device->watch_handle = handle;
1938 bool udev_device_get_db_persist(struct udev_device *udev_device)
1940 return udev_device->db_persist;
1943 void udev_device_set_db_persist(struct udev_device *udev_device)
1945 udev_device->db_persist = true;
1948 int udev_device_rename(struct udev_device *udev_device, const char *name)
1950 _cleanup_free_ char *dirname = NULL;
1951 const char *interface;
1955 if (udev_device == NULL || name == NULL)
1958 dirname = dirname_malloc(udev_device->syspath);
1962 new_syspath = strjoina(dirname, "/", name);
1964 r = udev_device_set_syspath(udev_device, new_syspath);
1968 interface = udev_device_get_property_value(udev_device, "INTERFACE");
1970 /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */
1971 udev_device_add_property_internal(udev_device, "INTERFACE_OLD", interface);
1972 udev_device_add_property_internal(udev_device, "INTERFACE", name);
1978 struct udev_device *udev_device_shallow_clone(struct udev_device *old_device)
1980 struct udev_device *device;
1982 if (old_device == NULL)
1985 device = udev_device_new(old_device->udev);
1992 udev_device_set_syspath(device, udev_device_get_syspath(old_device));
1993 udev_device_set_subsystem(device, udev_device_get_subsystem(old_device));
1994 udev_device_set_devnum(device, udev_device_get_devnum(old_device));
1999 struct udev_device *udev_device_clone_with_db(struct udev_device *old_device)
2001 struct udev_device *device;
2003 device = udev_device_shallow_clone(old_device);
2007 udev_device_read_db(device);
2008 udev_device_set_info_loaded(device);
2013 struct udev_device *udev_device_new_from_nulstr(struct udev *udev, char *nulstr, ssize_t buflen) {
2014 struct udev_device *device;
2017 if (nulstr == NULL || buflen <= 0) {
2023 device = udev_device_new(udev);
2030 udev_device_set_info_loaded(device);
2032 while (bufpos < buflen) {
2036 key = nulstr + bufpos;
2037 keylen = strlen(key);
2041 bufpos += keylen + 1;
2042 udev_device_add_property_from_string_parse(device, key);
2045 if (udev_device_add_property_from_string_parse_finish(device) < 0) {
2046 log_debug("missing values, invalid device");
2048 udev_device_unref(device);
2058 struct udev_device *udev_device_new_from_synthetic_event(struct udev *udev, const char *syspath, const char *action) {
2059 struct udev_device *ret;
2067 ret = udev_device_new_from_syspath(udev, syspath);
2071 r = udev_device_read_uevent_file(ret);
2073 udev_device_unref(ret);
2078 r = udev_device_set_action(ret, action);
2080 udev_device_unref(ret);
2088 int udev_device_copy_properties(struct udev_device *dst, struct udev_device *src) {
2089 struct udev_list_entry *entry;
2091 for ((entry = udev_device_get_properties_list_entry(src)); entry; entry = udev_list_entry_get_next(entry)) {
2092 const char *key, *value;
2094 key = udev_list_entry_get_name(entry);
2095 value = udev_list_entry_get_value(entry);
2097 udev_device_add_property(dst, key, value);