2 This file is part of systemd.
4 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
32 #include <sys/ioctl.h>
33 #include <sys/socket.h>
34 #include <linux/sockios.h>
37 #include "libudev-private.h"
39 static int udev_device_set_devnode(struct udev_device
*udev_device
, const char *devnode
);
42 * SECTION:libudev-device
43 * @short_description: kernel sys devices
45 * Representation of kernel sys devices. Devices are uniquely identified
46 * by their syspath, every device has exactly one path in the kernel sys
47 * filesystem. Devices usually belong to a kernel subsystem, and have
48 * a unique name inside that subsystem.
54 * Opaque object representing one kernel sys device.
58 struct udev_device
*parent_device
;
75 size_t monitor_buf_len
;
76 struct udev_list devlinks_list
;
77 struct udev_list properties_list
;
78 struct udev_list sysattr_value_list
;
79 struct udev_list sysattr_list
;
80 struct udev_list tags_list
;
81 unsigned long long int seqnum
;
82 usec_t usec_initialized
;
92 bool devlinks_uptodate
;
100 bool sysattr_list_read
;
105 * udev_device_get_seqnum:
106 * @udev_device: udev device
108 * This is only valid if the device was received through a monitor. Devices read from
109 * sys do not have a sequence number.
111 * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
113 _public_
unsigned long long int udev_device_get_seqnum(struct udev_device
*udev_device
)
115 if (udev_device
== NULL
)
117 return udev_device
->seqnum
;
120 static int udev_device_set_seqnum(struct udev_device
*udev_device
, unsigned long long int seqnum
)
124 udev_device
->seqnum
= seqnum
;
125 snprintf(num
, sizeof(num
), "%llu", seqnum
);
126 udev_device_add_property(udev_device
, "SEQNUM", num
);
130 int udev_device_get_ifindex(struct udev_device
*udev_device
)
132 if (!udev_device
->info_loaded
)
133 udev_device_read_uevent_file(udev_device
);
134 return udev_device
->ifindex
;
137 static int udev_device_set_ifindex(struct udev_device
*udev_device
, int ifindex
)
141 udev_device
->ifindex
= ifindex
;
142 snprintf(num
, sizeof(num
), "%d", ifindex
);
143 udev_device_add_property(udev_device
, "IFINDEX", num
);
148 * udev_device_get_devnum:
149 * @udev_device: udev device
151 * Get the device major/minor number.
153 * Returns: the dev_t number.
155 _public_ dev_t
udev_device_get_devnum(struct udev_device
*udev_device
)
157 if (udev_device
== NULL
)
158 return makedev(0, 0);
159 if (!udev_device
->info_loaded
)
160 udev_device_read_uevent_file(udev_device
);
161 return udev_device
->devnum
;
164 static int udev_device_set_devnum(struct udev_device
*udev_device
, dev_t devnum
)
168 udev_device
->devnum
= devnum
;
170 snprintf(num
, sizeof(num
), "%u", major(devnum
));
171 udev_device_add_property(udev_device
, "MAJOR", num
);
172 snprintf(num
, sizeof(num
), "%u", minor(devnum
));
173 udev_device_add_property(udev_device
, "MINOR", num
);
177 const char *udev_device_get_devpath_old(struct udev_device
*udev_device
)
179 return udev_device
->devpath_old
;
182 static int udev_device_set_devpath_old(struct udev_device
*udev_device
, const char *devpath_old
)
186 free(udev_device
->devpath_old
);
187 udev_device
->devpath_old
= strdup(devpath_old
);
188 if (udev_device
->devpath_old
== NULL
)
190 udev_device_add_property(udev_device
, "DEVPATH_OLD", udev_device
->devpath_old
);
192 pos
= strrchr(udev_device
->devpath_old
, '/');
199 * udev_device_get_driver:
200 * @udev_device: udev device
202 * Get the kernel driver name.
204 * Returns: the driver name string, or #NULL if there is no driver attached.
206 _public_
const char *udev_device_get_driver(struct udev_device
*udev_device
)
208 char driver
[UTIL_NAME_SIZE
];
210 if (udev_device
== NULL
)
212 if (!udev_device
->driver_set
) {
213 udev_device
->driver_set
= true;
214 if (util_get_sys_core_link_value(udev_device
->udev
, "driver", udev_device
->syspath
, driver
, sizeof(driver
)) > 0)
215 udev_device
->driver
= strdup(driver
);
217 return udev_device
->driver
;
220 static int udev_device_set_driver(struct udev_device
*udev_device
, const char *driver
)
222 free(udev_device
->driver
);
223 udev_device
->driver
= strdup(driver
);
224 if (udev_device
->driver
== NULL
)
226 udev_device
->driver_set
= true;
227 udev_device_add_property(udev_device
, "DRIVER", udev_device
->driver
);
232 * udev_device_get_devtype:
233 * @udev_device: udev device
235 * Retrieve the devtype string of the udev device.
237 * Returns: the devtype name of the udev device, or #NULL if it can not be determined
239 _public_
const char *udev_device_get_devtype(struct udev_device
*udev_device
)
241 if (udev_device
== NULL
)
243 if (!udev_device
->devtype_set
) {
244 udev_device
->devtype_set
= true;
245 udev_device_read_uevent_file(udev_device
);
247 return udev_device
->devtype
;
250 static int udev_device_set_devtype(struct udev_device
*udev_device
, const char *devtype
)
252 free(udev_device
->devtype
);
253 udev_device
->devtype
= strdup(devtype
);
254 if (udev_device
->devtype
== NULL
)
256 udev_device
->devtype_set
= true;
257 udev_device_add_property(udev_device
, "DEVTYPE", udev_device
->devtype
);
261 static int udev_device_set_subsystem(struct udev_device
*udev_device
, const char *subsystem
)
263 free(udev_device
->subsystem
);
264 udev_device
->subsystem
= strdup(subsystem
);
265 if (udev_device
->subsystem
== NULL
)
267 udev_device
->subsystem_set
= true;
268 udev_device_add_property(udev_device
, "SUBSYSTEM", udev_device
->subsystem
);
273 * udev_device_get_subsystem:
274 * @udev_device: udev device
276 * Retrieve the subsystem string of the udev device. The string does not
279 * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
281 _public_
const char *udev_device_get_subsystem(struct udev_device
*udev_device
)
283 char subsystem
[UTIL_NAME_SIZE
];
285 if (udev_device
== NULL
)
287 if (!udev_device
->subsystem_set
) {
288 udev_device
->subsystem_set
= true;
289 /* read "subsystem" link */
290 if (util_get_sys_core_link_value(udev_device
->udev
, "subsystem", udev_device
->syspath
, subsystem
, sizeof(subsystem
)) > 0) {
291 udev_device_set_subsystem(udev_device
, subsystem
);
292 return udev_device
->subsystem
;
295 if (startswith(udev_device
->devpath
, "/module/")) {
296 udev_device_set_subsystem(udev_device
, "module");
297 return udev_device
->subsystem
;
299 if (strstr(udev_device
->devpath
, "/drivers/") != NULL
) {
300 udev_device_set_subsystem(udev_device
, "drivers");
301 return udev_device
->subsystem
;
303 if (startswith(udev_device
->devpath
, "/subsystem/") ||
304 startswith(udev_device
->devpath
, "/class/") ||
305 startswith(udev_device
->devpath
, "/bus/")) {
306 udev_device_set_subsystem(udev_device
, "subsystem");
307 return udev_device
->subsystem
;
310 return udev_device
->subsystem
;
313 mode_t
udev_device_get_devnode_mode(struct udev_device
*udev_device
)
315 if (!udev_device
->info_loaded
)
316 udev_device_read_uevent_file(udev_device
);
317 return udev_device
->devnode_mode
;
320 static int udev_device_set_devnode_mode(struct udev_device
*udev_device
, mode_t mode
)
324 udev_device
->devnode_mode
= mode
;
325 snprintf(num
, sizeof(num
), "%#o", mode
);
326 udev_device_add_property(udev_device
, "DEVMODE", num
);
330 uid_t
udev_device_get_devnode_uid(struct udev_device
*udev_device
)
332 if (!udev_device
->info_loaded
)
333 udev_device_read_uevent_file(udev_device
);
334 return udev_device
->devnode_uid
;
337 static int udev_device_set_devnode_uid(struct udev_device
*udev_device
, uid_t uid
)
341 udev_device
->devnode_uid
= uid
;
342 snprintf(num
, sizeof(num
), "%u", uid
);
343 udev_device_add_property(udev_device
, "DEVUID", num
);
347 gid_t
udev_device_get_devnode_gid(struct udev_device
*udev_device
)
349 if (!udev_device
->info_loaded
)
350 udev_device_read_uevent_file(udev_device
);
351 return udev_device
->devnode_gid
;
354 static int udev_device_set_devnode_gid(struct udev_device
*udev_device
, gid_t gid
)
358 udev_device
->devnode_gid
= gid
;
359 snprintf(num
, sizeof(num
), "%u", gid
);
360 udev_device_add_property(udev_device
, "DEVGID", num
);
364 struct udev_list_entry
*udev_device_add_property(struct udev_device
*udev_device
, const char *key
, const char *value
)
366 udev_device
->envp_uptodate
= false;
368 struct udev_list_entry
*list_entry
;
370 list_entry
= udev_device_get_properties_list_entry(udev_device
);
371 list_entry
= udev_list_entry_get_by_name(list_entry
, key
);
372 if (list_entry
!= NULL
)
373 udev_list_entry_delete(list_entry
);
376 return udev_list_entry_add(&udev_device
->properties_list
, key
, value
);
379 static struct udev_list_entry
*udev_device_add_property_from_string(struct udev_device
*udev_device
, const char *property
)
381 char name
[UTIL_LINE_SIZE
];
384 strscpy(name
, sizeof(name
), property
);
385 val
= strchr(name
, '=');
392 return udev_device_add_property(udev_device
, name
, val
);
395 static int udev_device_set_syspath(struct udev_device
*udev_device
, const char *syspath
)
400 free(udev_device
->syspath
);
401 udev_device
->syspath
= strdup(syspath
);
402 if (udev_device
->syspath
== NULL
)
404 udev_device
->devpath
= udev_device
->syspath
+ strlen("/sys");
405 udev_device_add_property(udev_device
, "DEVPATH", udev_device
->devpath
);
407 pos
= strrchr(udev_device
->syspath
, '/');
410 udev_device
->sysname
= strdup(&pos
[1]);
411 if (udev_device
->sysname
== NULL
)
414 /* some devices have '!' in their name, change that to '/' */
416 while (udev_device
->sysname
[len
] != '\0') {
417 if (udev_device
->sysname
[len
] == '!')
418 udev_device
->sysname
[len
] = '/';
422 /* trailing number */
423 while (len
> 0 && isdigit(udev_device
->sysname
[--len
]))
424 udev_device
->sysnum
= &udev_device
->sysname
[len
];
426 /* sysname is completely numeric */
428 udev_device
->sysnum
= NULL
;
434 * parse property string, and if needed, update internal values accordingly
436 * udev_device_add_property_from_string_parse_finish() needs to be
437 * called after adding properties, and its return value checked
439 * udev_device_set_info_loaded() needs to be set, to avoid trying
440 * to use a device without a DEVPATH set
442 static void udev_device_add_property_from_string_parse(struct udev_device
*udev_device
, const char *property
)
444 if (startswith(property
, "DEVPATH=")) {
445 char path
[UTIL_PATH_SIZE
];
447 strscpyl(path
, sizeof(path
), "/sys", &property
[8], NULL
);
448 udev_device_set_syspath(udev_device
, path
);
449 } else if (startswith(property
, "SUBSYSTEM=")) {
450 udev_device_set_subsystem(udev_device
, &property
[10]);
451 } else if (startswith(property
, "DEVTYPE=")) {
452 udev_device_set_devtype(udev_device
, &property
[8]);
453 } else if (startswith(property
, "DEVNAME=")) {
454 udev_device_set_devnode(udev_device
, &property
[8]);
455 } else if (startswith(property
, "DEVLINKS=")) {
456 char devlinks
[UTIL_PATH_SIZE
];
460 strscpy(devlinks
, sizeof(devlinks
), &property
[9]);
462 next
= strchr(slink
, ' ');
463 while (next
!= NULL
) {
465 udev_device_add_devlink(udev_device
, slink
);
467 next
= strchr(slink
, ' ');
469 if (slink
[0] != '\0')
470 udev_device_add_devlink(udev_device
, slink
);
471 } else if (startswith(property
, "TAGS=")) {
472 char tags
[UTIL_PATH_SIZE
];
475 strscpy(tags
, sizeof(tags
), &property
[5]);
476 next
= strchr(tags
, ':');
479 while (next
[0] != '\0') {
483 next
= strchr(tag
, ':');
488 udev_device_add_tag(udev_device
, tag
);
491 } else if (startswith(property
, "USEC_INITIALIZED=")) {
492 udev_device_set_usec_initialized(udev_device
, strtoull(&property
[19], NULL
, 10));
493 } else if (startswith(property
, "DRIVER=")) {
494 udev_device_set_driver(udev_device
, &property
[7]);
495 } else if (startswith(property
, "ACTION=")) {
496 udev_device_set_action(udev_device
, &property
[7]);
497 } else if (startswith(property
, "MAJOR=")) {
498 udev_device
->maj
= strtoull(&property
[6], NULL
, 10);
499 } else if (startswith(property
, "MINOR=")) {
500 udev_device
->min
= strtoull(&property
[6], NULL
, 10);
501 } else if (startswith(property
, "DEVPATH_OLD=")) {
502 udev_device_set_devpath_old(udev_device
, &property
[12]);
503 } else if (startswith(property
, "SEQNUM=")) {
504 udev_device_set_seqnum(udev_device
, strtoull(&property
[7], NULL
, 10));
505 } else if (startswith(property
, "IFINDEX=")) {
506 udev_device_set_ifindex(udev_device
, strtoull(&property
[8], NULL
, 10));
507 } else if (startswith(property
, "DEVMODE=")) {
508 udev_device_set_devnode_mode(udev_device
, strtoul(&property
[8], NULL
, 8));
509 } else if (startswith(property
, "DEVUID=")) {
510 udev_device_set_devnode_uid(udev_device
, strtoul(&property
[7], NULL
, 10));
511 } else if (startswith(property
, "DEVGID=")) {
512 udev_device_set_devnode_gid(udev_device
, strtoul(&property
[7], NULL
, 10));
514 udev_device_add_property_from_string(udev_device
, property
);
518 static int udev_device_add_property_from_string_parse_finish(struct udev_device
*udev_device
)
520 if (udev_device
->maj
> 0)
521 udev_device_set_devnum(udev_device
, makedev(udev_device
->maj
, udev_device
->min
));
522 udev_device
->maj
= 0;
523 udev_device
->min
= 0;
525 if (udev_device
->devpath
== NULL
|| udev_device
->subsystem
== NULL
)
531 * udev_device_get_property_value:
532 * @udev_device: udev device
533 * @key: property name
535 * Get the value of a given property.
537 * Returns: the property string, or #NULL if there is no such property.
539 _public_
const char *udev_device_get_property_value(struct udev_device
*udev_device
, const char *key
)
541 struct udev_list_entry
*list_entry
;
543 if (udev_device
== NULL
)
548 list_entry
= udev_device_get_properties_list_entry(udev_device
);
549 list_entry
= udev_list_entry_get_by_name(list_entry
, key
);
550 return udev_list_entry_get_value(list_entry
);
553 int udev_device_read_db(struct udev_device
*udev_device
, const char *dbfile
)
555 char filename
[UTIL_PATH_SIZE
];
556 char line
[UTIL_LINE_SIZE
];
559 /* providing a database file will always force-load it */
560 if (dbfile
== NULL
) {
563 if (udev_device
->db_loaded
)
565 udev_device
->db_loaded
= true;
567 id
= udev_device_get_id_filename(udev_device
);
570 strscpyl(filename
, sizeof(filename
), "/run/udev/data/", id
, NULL
);
574 f
= fopen(dbfile
, "re");
576 return log_debug_errno(errno
, "no db file to read %s: %m", dbfile
);
578 /* devices with a database entry are initialized */
579 udev_device
->is_initialized
= true;
581 while (fgets(line
, sizeof(line
), f
)) {
584 struct udev_list_entry
*entry
;
593 strscpyl(filename
, sizeof(filename
), "/dev/", val
, NULL
);
594 udev_device_add_devlink(udev_device
, filename
);
597 udev_device_set_devlink_priority(udev_device
, atoi(val
));
600 entry
= udev_device_add_property_from_string(udev_device
, val
);
601 udev_list_entry_set_num(entry
, true);
604 udev_device_add_tag(udev_device
, val
);
607 udev_device_set_watch_handle(udev_device
, atoi(val
));
610 udev_device_set_usec_initialized(udev_device
, strtoull(val
, NULL
, 10));
616 log_debug("device %p filled with db file data", udev_device
);
620 int udev_device_read_uevent_file(struct udev_device
*udev_device
)
622 char filename
[UTIL_PATH_SIZE
];
624 char line
[UTIL_LINE_SIZE
];
628 if (udev_device
->uevent_loaded
)
631 strscpyl(filename
, sizeof(filename
), udev_device
->syspath
, "/uevent", NULL
);
632 f
= fopen(filename
, "re");
635 udev_device
->uevent_loaded
= true;
637 while (fgets(line
, sizeof(line
), f
)) {
640 pos
= strchr(line
, '\n');
645 if (startswith(line
, "DEVTYPE=")) {
646 udev_device_set_devtype(udev_device
, &line
[8]);
649 if (startswith(line
, "IFINDEX=")) {
650 udev_device_set_ifindex(udev_device
, strtoull(&line
[8], NULL
, 10));
653 if (startswith(line
, "DEVNAME=")) {
654 udev_device_set_devnode(udev_device
, &line
[8]);
658 if (startswith(line
, "MAJOR="))
659 maj
= strtoull(&line
[6], NULL
, 10);
660 else if (startswith(line
, "MINOR="))
661 min
= strtoull(&line
[6], NULL
, 10);
662 else if (startswith(line
, "DEVMODE="))
663 udev_device
->devnode_mode
= strtoul(&line
[8], NULL
, 8);
665 udev_device_add_property_from_string(udev_device
, line
);
668 udev_device
->devnum
= makedev(maj
, min
);
673 void udev_device_set_info_loaded(struct udev_device
*device
)
675 device
->info_loaded
= true;
678 static struct udev_device
*udev_device_new(struct udev
*udev
)
680 struct udev_device
*udev_device
;
687 udev_device
= new0(struct udev_device
, 1);
688 if (udev_device
== NULL
) {
692 udev_device
->refcount
= 1;
693 udev_device
->udev
= udev
;
694 udev_list_init(udev
, &udev_device
->devlinks_list
, true);
695 udev_list_init(udev
, &udev_device
->properties_list
, true);
696 udev_list_init(udev
, &udev_device
->sysattr_value_list
, true);
697 udev_list_init(udev
, &udev_device
->sysattr_list
, false);
698 udev_list_init(udev
, &udev_device
->tags_list
, true);
699 udev_device
->watch_handle
= -1;
705 * udev_device_new_from_syspath:
706 * @udev: udev library context
707 * @syspath: sys device path including sys directory
709 * Create new udev device, and fill in information from the sys
710 * device and the udev database entry. The syspath is the absolute
711 * path to the device, including the sys mount point.
713 * The initial refcount is 1, and needs to be decremented to
714 * release the resources of the udev device.
716 * Returns: a new udev device, or #NULL, if it does not exist
718 _public_
struct udev_device
*udev_device_new_from_syspath(struct udev
*udev
, const char *syspath
)
721 char path
[UTIL_PATH_SIZE
];
724 struct udev_device
*udev_device
;
731 if (syspath
== NULL
) {
736 /* path starts in sys */
737 if (!startswith(syspath
, "/sys")) {
738 log_debug("not in sys :%s", syspath
);
743 /* path is not a root directory */
744 subdir
= syspath
+ strlen("/sys");
745 pos
= strrchr(subdir
, '/');
746 if (pos
== NULL
|| pos
[1] == '\0' || pos
< &subdir
[2]) {
751 /* resolve possible symlink to real path */
752 strscpy(path
, sizeof(path
), syspath
);
753 util_resolve_sys_link(udev
, path
, sizeof(path
));
755 if (startswith(path
+ strlen("/sys"), "/devices/")) {
756 char file
[UTIL_PATH_SIZE
];
758 /* all "devices" require a "uevent" file */
759 strscpyl(file
, sizeof(file
), path
, "/uevent", NULL
);
760 if (stat(file
, &statbuf
) != 0)
763 /* everything else just needs to be a directory */
764 if (stat(path
, &statbuf
) != 0)
767 if (!S_ISDIR(statbuf
.st_mode
)) {
773 udev_device
= udev_device_new(udev
);
774 if (udev_device
== NULL
)
777 udev_device_set_syspath(udev_device
, path
);
778 log_debug("device %p has devpath '%s'", udev_device
, udev_device_get_devpath(udev_device
));
784 * udev_device_new_from_devnum:
785 * @udev: udev library context
786 * @type: char or block device
787 * @devnum: device major/minor number
789 * Create new udev device, and fill in information from the sys
790 * device and the udev database entry. The device is looked-up
791 * by its major/minor number and type. Character and block device
792 * numbers are not unique across the two types.
794 * The initial refcount is 1, and needs to be decremented to
795 * release the resources of the udev device.
797 * Returns: a new udev device, or #NULL, if it does not exist
799 _public_
struct udev_device
*udev_device_new_from_devnum(struct udev
*udev
, char type
, dev_t devnum
)
801 char path
[UTIL_PATH_SIZE
];
802 const char *type_str
;
806 else if (type
== 'c')
813 /* use /sys/dev/{block,char}/<maj>:<min> link */
814 snprintf(path
, sizeof(path
), "/sys/dev/%s/%u:%u",
815 type_str
, major(devnum
), minor(devnum
));
816 return udev_device_new_from_syspath(udev
, path
);
820 * udev_device_new_from_device_id:
821 * @udev: udev library context
822 * @id: text string identifying a kernel device
824 * Create new udev device, and fill in information from the sys
825 * device and the udev database entry. The device is looked-up
826 * by a special string:
827 * b8:2 - block device major:minor
828 * c128:1 - char device major:minor
829 * n3 - network device ifindex
830 * +sound:card29 - kernel driver core subsystem:device name
832 * The initial refcount is 1, and needs to be decremented to
833 * release the resources of the udev device.
835 * Returns: a new udev device, or #NULL, if it does not exist
837 _public_
struct udev_device
*udev_device_new_from_device_id(struct udev
*udev
, const char *id
)
841 char subsys
[UTIL_PATH_SIZE
];
847 if (sscanf(id
, "%c%i:%i", &type
, &maj
, &min
) != 3)
849 return udev_device_new_from_devnum(udev
, type
, makedev(maj
, min
));
853 struct udev_device
*dev
;
856 ifindex
= strtoul(&id
[1], NULL
, 10);
862 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
865 memzero(&ifr
, sizeof(struct ifreq
));
866 ifr
.ifr_ifindex
= ifindex
;
867 if (ioctl(sk
, SIOCGIFNAME
, &ifr
) != 0) {
873 dev
= udev_device_new_from_subsystem_sysname(udev
, "net", ifr
.ifr_name
);
876 if (udev_device_get_ifindex(dev
) == ifindex
)
879 /* this is racy, so we may end up with the wrong device */
880 udev_device_unref(dev
);
885 strscpy(subsys
, sizeof(subsys
), &id
[1]);
886 sysname
= strchr(subsys
, ':');
887 if (sysname
== NULL
) {
892 sysname
= &sysname
[1];
893 return udev_device_new_from_subsystem_sysname(udev
, subsys
, sysname
);
901 * udev_device_new_from_subsystem_sysname:
902 * @udev: udev library context
903 * @subsystem: the subsystem of the device
904 * @sysname: the name of the device
906 * Create new udev device, and fill in information from the sys device
907 * and the udev database entry. The device is looked up by the subsystem
908 * and name string of the device, like "mem" / "zero", or "block" / "sda".
910 * The initial refcount is 1, and needs to be decremented to
911 * release the resources of the udev device.
913 * Returns: a new udev device, or #NULL, if it does not exist
915 _public_
struct udev_device
*udev_device_new_from_subsystem_sysname(struct udev
*udev
, const char *subsystem
, const char *sysname
)
917 char path
[UTIL_PATH_SIZE
];
920 if (streq(subsystem
, "subsystem")) {
921 strscpyl(path
, sizeof(path
), "/sys/subsystem/", sysname
, NULL
);
922 if (stat(path
, &statbuf
) == 0)
925 strscpyl(path
, sizeof(path
), "/sys/bus/", sysname
, NULL
);
926 if (stat(path
, &statbuf
) == 0)
929 strscpyl(path
, sizeof(path
), "/sys/class/", sysname
, NULL
);
930 if (stat(path
, &statbuf
) == 0)
935 if (streq(subsystem
, "module")) {
936 strscpyl(path
, sizeof(path
), "/sys/module/", sysname
, NULL
);
937 if (stat(path
, &statbuf
) == 0)
942 if (streq(subsystem
, "drivers")) {
943 char subsys
[UTIL_NAME_SIZE
];
946 strscpy(subsys
, sizeof(subsys
), sysname
);
947 driver
= strchr(subsys
, ':');
948 if (driver
!= NULL
) {
952 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsys
, "/drivers/", driver
, NULL
);
953 if (stat(path
, &statbuf
) == 0)
956 strscpyl(path
, sizeof(path
), "/sys/bus/", subsys
, "/drivers/", driver
, NULL
);
957 if (stat(path
, &statbuf
) == 0)
965 strscpyl(path
, sizeof(path
), "/sys/subsystem/", subsystem
, "/devices/", sysname
, NULL
);
966 if (stat(path
, &statbuf
) == 0)
969 strscpyl(path
, sizeof(path
), "/sys/bus/", subsystem
, "/devices/", sysname
, NULL
);
970 if (stat(path
, &statbuf
) == 0)
973 strscpyl(path
, sizeof(path
), "/sys/class/", subsystem
, "/", sysname
, NULL
);
974 if (stat(path
, &statbuf
) == 0)
979 return udev_device_new_from_syspath(udev
, path
);
983 * udev_device_new_from_environment
984 * @udev: udev library context
986 * Create new udev device, and fill in information from the
987 * current process environment. This only works reliable if
988 * the process is called from a udev rule. It is usually used
989 * for tools executed from IMPORT= rules.
991 * The initial refcount is 1, and needs to be decremented to
992 * release the resources of the udev device.
994 * Returns: a new udev device, or #NULL, if it does not exist
996 _public_
struct udev_device
*udev_device_new_from_environment(struct udev
*udev
)
999 struct udev_device
*udev_device
;
1001 udev_device
= udev_device_new(udev
);
1002 if (udev_device
== NULL
)
1004 udev_device_set_info_loaded(udev_device
);
1006 for (i
= 0; environ
[i
] != NULL
; i
++)
1007 udev_device_add_property_from_string_parse(udev_device
, environ
[i
]);
1009 if (udev_device_add_property_from_string_parse_finish(udev_device
) < 0) {
1010 log_debug("missing values, invalid device");
1011 udev_device_unref(udev_device
);
1018 static struct udev_device
*device_new_from_parent(struct udev_device
*udev_device
)
1020 struct udev_device
*udev_device_parent
= NULL
;
1021 char path
[UTIL_PATH_SIZE
];
1024 strscpy(path
, sizeof(path
), udev_device
->syspath
);
1025 subdir
= path
+ strlen("/sys/");
1029 pos
= strrchr(subdir
, '/');
1030 if (pos
== NULL
|| pos
< &subdir
[2])
1033 udev_device_parent
= udev_device_new_from_syspath(udev_device
->udev
, path
);
1034 if (udev_device_parent
!= NULL
)
1035 return udev_device_parent
;
1043 * udev_device_get_parent:
1044 * @udev_device: the device to start searching from
1046 * Find the next parent device, and fill in information from the sys
1047 * device and the udev database entry.
1049 * Returned device is not referenced. It is attached to the child
1050 * device, and will be cleaned up when the child device is cleaned up.
1052 * It is not necessarily just the upper level directory, empty or not
1053 * recognized sys directories are ignored.
1055 * It can be called as many times as needed, without caring about
1058 * Returns: a new udev device, or #NULL, if it no parent exist.
1060 _public_
struct udev_device
*udev_device_get_parent(struct udev_device
*udev_device
)
1062 if (udev_device
== NULL
) {
1066 if (!udev_device
->parent_set
) {
1067 udev_device
->parent_set
= true;
1068 udev_device
->parent_device
= device_new_from_parent(udev_device
);
1070 return udev_device
->parent_device
;
1074 * udev_device_get_parent_with_subsystem_devtype:
1075 * @udev_device: udev device to start searching from
1076 * @subsystem: the subsystem of the device
1077 * @devtype: the type (DEVTYPE) of the device
1079 * Find the next parent device, with a matching subsystem and devtype
1080 * value, and fill in information from the sys device and the udev
1083 * If devtype is #NULL, only subsystem is checked, and any devtype will
1086 * Returned device is not referenced. It is attached to the child
1087 * device, and will be cleaned up when the child device is cleaned up.
1089 * It can be called as many times as needed, without caring about
1092 * Returns: a new udev device, or #NULL if no matching parent exists.
1094 _public_
struct udev_device
*udev_device_get_parent_with_subsystem_devtype(struct udev_device
*udev_device
, const char *subsystem
, const char *devtype
)
1096 struct udev_device
*parent
;
1098 if (subsystem
== NULL
) {
1103 parent
= udev_device_get_parent(udev_device
);
1104 while (parent
!= NULL
) {
1105 const char *parent_subsystem
;
1106 const char *parent_devtype
;
1108 parent_subsystem
= udev_device_get_subsystem(parent
);
1109 if (parent_subsystem
!= NULL
&& streq(parent_subsystem
, subsystem
)) {
1110 if (devtype
== NULL
)
1112 parent_devtype
= udev_device_get_devtype(parent
);
1113 if (parent_devtype
!= NULL
&& streq(parent_devtype
, devtype
))
1116 parent
= udev_device_get_parent(parent
);
1126 * udev_device_get_udev:
1127 * @udev_device: udev device
1129 * Retrieve the udev library context the device was created with.
1131 * Returns: the udev library context
1133 _public_
struct udev
*udev_device_get_udev(struct udev_device
*udev_device
)
1135 if (udev_device
== NULL
)
1137 return udev_device
->udev
;
1142 * @udev_device: udev device
1144 * Take a reference of a udev device.
1146 * Returns: the passed udev device
1148 _public_
struct udev_device
*udev_device_ref(struct udev_device
*udev_device
)
1150 if (udev_device
== NULL
)
1152 udev_device
->refcount
++;
1157 * udev_device_unref:
1158 * @udev_device: udev device
1160 * Drop a reference of a udev device. If the refcount reaches zero,
1161 * the resources of the device will be released.
1165 _public_
struct udev_device
*udev_device_unref(struct udev_device
*udev_device
)
1167 if (udev_device
== NULL
)
1169 udev_device
->refcount
--;
1170 if (udev_device
->refcount
> 0)
1172 if (udev_device
->parent_device
!= NULL
)
1173 udev_device_unref(udev_device
->parent_device
);
1174 free(udev_device
->syspath
);
1175 free(udev_device
->sysname
);
1176 free(udev_device
->devnode
);
1177 free(udev_device
->subsystem
);
1178 free(udev_device
->devtype
);
1179 udev_list_cleanup(&udev_device
->devlinks_list
);
1180 udev_list_cleanup(&udev_device
->properties_list
);
1181 udev_list_cleanup(&udev_device
->sysattr_value_list
);
1182 udev_list_cleanup(&udev_device
->sysattr_list
);
1183 udev_list_cleanup(&udev_device
->tags_list
);
1184 free(udev_device
->action
);
1185 free(udev_device
->driver
);
1186 free(udev_device
->devpath_old
);
1187 free(udev_device
->id_filename
);
1188 free(udev_device
->envp
);
1189 free(udev_device
->monitor_buf
);
1195 * udev_device_get_devpath:
1196 * @udev_device: udev device
1198 * Retrieve the kernel devpath value of the udev device. The path
1199 * does not contain the sys mount point, and starts with a '/'.
1201 * Returns: the devpath of the udev device
1203 _public_
const char *udev_device_get_devpath(struct udev_device
*udev_device
)
1205 if (udev_device
== NULL
)
1207 return udev_device
->devpath
;
1211 * udev_device_get_syspath:
1212 * @udev_device: udev device
1214 * Retrieve the sys path of the udev device. The path is an
1215 * absolute path and starts with the sys mount point.
1217 * Returns: the sys path of the udev device
1219 _public_
const char *udev_device_get_syspath(struct udev_device
*udev_device
)
1221 if (udev_device
== NULL
)
1223 return udev_device
->syspath
;
1227 * udev_device_get_sysname:
1228 * @udev_device: udev device
1230 * Get the kernel device name in /sys.
1232 * Returns: the name string of the device device
1234 _public_
const char *udev_device_get_sysname(struct udev_device
*udev_device
)
1236 if (udev_device
== NULL
)
1238 return udev_device
->sysname
;
1242 * udev_device_get_sysnum:
1243 * @udev_device: udev device
1245 * Get the instance number of the device.
1247 * Returns: the trailing number string of the device name
1249 _public_
const char *udev_device_get_sysnum(struct udev_device
*udev_device
)
1251 if (udev_device
== NULL
)
1253 return udev_device
->sysnum
;
1257 * udev_device_get_devnode:
1258 * @udev_device: udev device
1260 * Retrieve the device node file name belonging to the udev device.
1261 * The path is an absolute path, and starts with the device directory.
1263 * Returns: the device node file name of the udev device, or #NULL if no device node exists
1265 _public_
const char *udev_device_get_devnode(struct udev_device
*udev_device
)
1267 if (udev_device
== NULL
)
1269 if (udev_device
->devnode
!= NULL
)
1270 return udev_device
->devnode
;
1271 if (!udev_device
->info_loaded
)
1272 udev_device_read_uevent_file(udev_device
);
1273 return udev_device
->devnode
;
1277 * udev_device_get_devlinks_list_entry:
1278 * @udev_device: udev device
1280 * Retrieve the list of device links pointing to the device file of
1281 * the udev device. The next list entry can be retrieved with
1282 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
1283 * The devlink path can be retrieved from the list entry by
1284 * udev_list_entry_get_name(). The path is an absolute path, and starts with
1285 * the device directory.
1287 * Returns: the first entry of the device node link list
1289 _public_
struct udev_list_entry
*udev_device_get_devlinks_list_entry(struct udev_device
*udev_device
)
1291 if (udev_device
== NULL
)
1293 if (!udev_device
->info_loaded
)
1294 udev_device_read_db(udev_device
, NULL
);
1295 return udev_list_get_entry(&udev_device
->devlinks_list
);
1298 void udev_device_cleanup_devlinks_list(struct udev_device
*udev_device
)
1300 udev_device
->devlinks_uptodate
= false;
1301 udev_list_cleanup(&udev_device
->devlinks_list
);
1305 * udev_device_get_properties_list_entry:
1306 * @udev_device: udev device
1308 * Retrieve the list of key/value device properties of the udev
1309 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
1310 * which returns #NULL if no more entries exist. The property name
1311 * can be retrieved from the list entry by udev_list_entry_get_name(),
1312 * the property value by udev_list_entry_get_value().
1314 * Returns: the first entry of the property list
1316 _public_
struct udev_list_entry
*udev_device_get_properties_list_entry(struct udev_device
*udev_device
)
1318 if (udev_device
== NULL
)
1320 if (!udev_device
->info_loaded
) {
1321 udev_device_read_uevent_file(udev_device
);
1322 udev_device_read_db(udev_device
, NULL
);
1324 if (!udev_device
->devlinks_uptodate
) {
1325 char symlinks
[UTIL_PATH_SIZE
];
1326 struct udev_list_entry
*list_entry
;
1328 udev_device
->devlinks_uptodate
= true;
1329 list_entry
= udev_device_get_devlinks_list_entry(udev_device
);
1330 if (list_entry
!= NULL
) {
1335 l
= strpcpyl(&s
, sizeof(symlinks
), udev_list_entry_get_name(list_entry
), NULL
);
1336 udev_list_entry_foreach(list_entry
, udev_list_entry_get_next(list_entry
))
1337 l
= strpcpyl(&s
, l
, " ", udev_list_entry_get_name(list_entry
), NULL
);
1338 udev_device_add_property(udev_device
, "DEVLINKS", symlinks
);
1341 if (!udev_device
->tags_uptodate
) {
1342 udev_device
->tags_uptodate
= true;
1343 if (udev_device_get_tags_list_entry(udev_device
) != NULL
) {
1344 char tags
[UTIL_PATH_SIZE
];
1345 struct udev_list_entry
*list_entry
;
1350 l
= strpcpyl(&s
, sizeof(tags
), ":", NULL
);
1351 udev_list_entry_foreach(list_entry
, udev_device_get_tags_list_entry(udev_device
))
1352 l
= strpcpyl(&s
, l
, udev_list_entry_get_name(list_entry
), ":", NULL
);
1353 udev_device_add_property(udev_device
, "TAGS", tags
);
1356 return udev_list_get_entry(&udev_device
->properties_list
);
1360 * udev_device_get_action:
1361 * @udev_device: udev device
1363 * This is only valid if the device was received through a monitor. Devices read from
1364 * sys do not have an action string. Usual actions are: add, remove, change, online,
1367 * Returns: the kernel action value, or #NULL if there is no action value available.
1369 _public_
const char *udev_device_get_action(struct udev_device
*udev_device
)
1371 if (udev_device
== NULL
)
1373 return udev_device
->action
;
1377 * udev_device_get_usec_since_initialized:
1378 * @udev_device: udev device
1380 * Return the number of microseconds passed since udev set up the
1381 * device for the first time.
1383 * This is only implemented for devices with need to store properties
1384 * in the udev database. All other devices return 0 here.
1386 * Returns: the number of microseconds since the device was first seen.
1388 _public_
unsigned long long int udev_device_get_usec_since_initialized(struct udev_device
*udev_device
)
1392 if (udev_device
== NULL
)
1394 if (!udev_device
->info_loaded
)
1395 udev_device_read_db(udev_device
, NULL
);
1396 if (udev_device
->usec_initialized
== 0)
1398 now_ts
= now(CLOCK_MONOTONIC
);
1401 return now_ts
- udev_device
->usec_initialized
;
1404 usec_t
udev_device_get_usec_initialized(struct udev_device
*udev_device
)
1406 return udev_device
->usec_initialized
;
1409 void udev_device_set_usec_initialized(struct udev_device
*udev_device
, usec_t usec_initialized
)
1413 udev_device
->usec_initialized
= usec_initialized
;
1414 snprintf(num
, sizeof(num
), USEC_FMT
, usec_initialized
);
1415 udev_device_add_property(udev_device
, "USEC_INITIALIZED", num
);
1419 * udev_device_get_sysattr_value:
1420 * @udev_device: udev device
1421 * @sysattr: attribute name
1423 * The retrieved value is cached in the device. Repeated calls will return the same
1424 * value and not open the attribute again.
1426 * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
1428 _public_
const char *udev_device_get_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
)
1430 struct udev_list_entry
*list_entry
;
1431 char path
[UTIL_PATH_SIZE
];
1433 struct stat statbuf
;
1436 const char *val
= NULL
;
1438 if (udev_device
== NULL
)
1440 if (sysattr
== NULL
)
1443 /* look for possibly already cached result */
1444 list_entry
= udev_list_get_entry(&udev_device
->sysattr_value_list
);
1445 list_entry
= udev_list_entry_get_by_name(list_entry
, sysattr
);
1446 if (list_entry
!= NULL
)
1447 return udev_list_entry_get_value(list_entry
);
1449 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", sysattr
, NULL
);
1450 if (lstat(path
, &statbuf
) != 0) {
1451 udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, NULL
);
1455 if (S_ISLNK(statbuf
.st_mode
)) {
1457 * Some core links return only the last element of the target path,
1458 * these are just values, the paths should not be exposed.
1460 if (streq(sysattr
, "driver") ||
1461 streq(sysattr
, "subsystem") ||
1462 streq(sysattr
, "module")) {
1463 if (util_get_sys_core_link_value(udev_device
->udev
, sysattr
,
1464 udev_device
->syspath
, value
, sizeof(value
)) < 0)
1466 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1467 val
= udev_list_entry_get_value(list_entry
);
1474 /* skip directories */
1475 if (S_ISDIR(statbuf
.st_mode
))
1478 /* skip non-readable files */
1479 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1482 /* read attribute value */
1483 fd
= open(path
, O_RDONLY
|O_CLOEXEC
);
1486 size
= read(fd
, value
, sizeof(value
));
1490 if (size
== sizeof(value
))
1493 /* got a valid value, store it in cache and return it */
1495 util_remove_trailing_chars(value
, '\n');
1496 list_entry
= udev_list_entry_add(&udev_device
->sysattr_value_list
, sysattr
, value
);
1497 val
= udev_list_entry_get_value(list_entry
);
1503 * udev_device_set_sysattr_value:
1504 * @udev_device: udev device
1505 * @sysattr: attribute name
1506 * @value: new value to be set
1508 * Update the contents of the sys attribute and the cached value of the device.
1510 * Returns: Negative error code on failure or 0 on success.
1512 _public_
int udev_device_set_sysattr_value(struct udev_device
*udev_device
, const char *sysattr
, char *value
)
1514 struct udev_device
*dev
;
1515 char path
[UTIL_PATH_SIZE
];
1516 struct stat statbuf
;
1518 ssize_t size
, value_len
;
1521 if (udev_device
== NULL
)
1524 if (sysattr
== NULL
)
1529 value_len
= strlen(value
);
1531 strscpyl(path
, sizeof(path
), udev_device_get_syspath(dev
), "/", sysattr
, NULL
);
1532 if (lstat(path
, &statbuf
) != 0) {
1533 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, NULL
);
1538 if (S_ISLNK(statbuf
.st_mode
)) {
1543 /* skip directories */
1544 if (S_ISDIR(statbuf
.st_mode
)) {
1549 /* skip non-readable files */
1550 if ((statbuf
.st_mode
& S_IRUSR
) == 0) {
1555 /* Value is limited to 4k */
1556 if (value_len
> 4096) {
1560 util_remove_trailing_chars(value
, '\n');
1562 /* write attribute value */
1563 fd
= open(path
, O_WRONLY
|O_CLOEXEC
);
1568 size
= write(fd
, value
, value_len
);
1574 if (size
< value_len
) {
1579 /* wrote a valid value, store it in cache and return it */
1580 udev_list_entry_add(&dev
->sysattr_value_list
, sysattr
, value
);
1582 if (dev
!= udev_device
)
1583 udev_device_unref(dev
);
1587 static int udev_device_sysattr_list_read(struct udev_device
*udev_device
)
1589 struct dirent
*dent
;
1593 if (udev_device
== NULL
)
1595 if (udev_device
->sysattr_list_read
)
1598 dir
= opendir(udev_device_get_syspath(udev_device
));
1602 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
1603 char path
[UTIL_PATH_SIZE
];
1604 struct stat statbuf
;
1606 /* only handle symlinks and regular files */
1607 if (dent
->d_type
!= DT_LNK
&& dent
->d_type
!= DT_REG
)
1610 strscpyl(path
, sizeof(path
), udev_device_get_syspath(udev_device
), "/", dent
->d_name
, NULL
);
1611 if (lstat(path
, &statbuf
) != 0)
1613 if ((statbuf
.st_mode
& S_IRUSR
) == 0)
1616 udev_list_entry_add(&udev_device
->sysattr_list
, dent
->d_name
, NULL
);
1621 udev_device
->sysattr_list_read
= true;
1627 * udev_device_get_sysattr_list_entry:
1628 * @udev_device: udev device
1630 * Retrieve the list of available sysattrs, with value being empty;
1631 * This just return all available sysfs attributes for a particular
1632 * device without reading their values.
1634 * Returns: the first entry of the property list
1636 _public_
struct udev_list_entry
*udev_device_get_sysattr_list_entry(struct udev_device
*udev_device
)
1638 if (!udev_device
->sysattr_list_read
) {
1640 ret
= udev_device_sysattr_list_read(udev_device
);
1645 return udev_list_get_entry(&udev_device
->sysattr_list
);
1648 static int udev_device_set_devnode(struct udev_device
*udev_device
, const char *devnode
)
1650 free(udev_device
->devnode
);
1651 if (devnode
[0] != '/') {
1652 if (asprintf(&udev_device
->devnode
, "/dev/%s", devnode
) < 0)
1653 udev_device
->devnode
= NULL
;
1655 udev_device
->devnode
= strdup(devnode
);
1657 if (udev_device
->devnode
== NULL
)
1659 udev_device_add_property(udev_device
, "DEVNAME", udev_device
->devnode
);
1663 int udev_device_add_devlink(struct udev_device
*udev_device
, const char *devlink
)
1665 struct udev_list_entry
*list_entry
;
1667 udev_device
->devlinks_uptodate
= false;
1668 list_entry
= udev_list_entry_add(&udev_device
->devlinks_list
, devlink
, NULL
);
1669 if (list_entry
== NULL
)
1674 const char *udev_device_get_id_filename(struct udev_device
*udev_device
)
1676 if (udev_device
->id_filename
== NULL
) {
1677 if (udev_device_get_subsystem(udev_device
) == NULL
)
1680 if (major(udev_device_get_devnum(udev_device
)) > 0) {
1681 /* use dev_t -- b259:131072, c254:0 */
1682 if (asprintf(&udev_device
->id_filename
, "%c%u:%u",
1683 streq(udev_device_get_subsystem(udev_device
), "block") ? 'b' : 'c',
1684 major(udev_device_get_devnum(udev_device
)),
1685 minor(udev_device_get_devnum(udev_device
))) < 0)
1686 udev_device
->id_filename
= NULL
;
1687 } else if (udev_device_get_ifindex(udev_device
) > 0) {
1688 /* use netdev ifindex -- n3 */
1689 if (asprintf(&udev_device
->id_filename
, "n%i", udev_device_get_ifindex(udev_device
)) < 0)
1690 udev_device
->id_filename
= NULL
;
1693 * use $subsys:$syname -- pci:0000:00:1f.2
1694 * sysname() has '!' translated, get it from devpath
1696 const char *sysname
;
1697 sysname
= strrchr(udev_device
->devpath
, '/');
1698 if (sysname
== NULL
)
1700 sysname
= &sysname
[1];
1701 if (asprintf(&udev_device
->id_filename
, "+%s:%s", udev_device_get_subsystem(udev_device
), sysname
) < 0)
1702 udev_device
->id_filename
= NULL
;
1705 return udev_device
->id_filename
;
1709 * udev_device_get_is_initialized:
1710 * @udev_device: udev device
1712 * Check if udev has already handled the device and has set up
1713 * device node permissions and context, or has renamed a network
1716 * This is only implemented for devices with a device node
1717 * or network interfaces. All other devices return 1 here.
1719 * Returns: 1 if the device is set up. 0 otherwise.
1721 _public_
int udev_device_get_is_initialized(struct udev_device
*udev_device
)
1723 if (!udev_device
->info_loaded
)
1724 udev_device_read_db(udev_device
, NULL
);
1725 return udev_device
->is_initialized
;
1728 void udev_device_set_is_initialized(struct udev_device
*udev_device
)
1730 udev_device
->is_initialized
= true;
1733 static bool is_valid_tag(const char *tag
)
1735 return !strchr(tag
, ':') && !strchr(tag
, ' ');
1738 int udev_device_add_tag(struct udev_device
*udev_device
, const char *tag
)
1740 if (!is_valid_tag(tag
))
1742 udev_device
->tags_uptodate
= false;
1743 if (udev_list_entry_add(&udev_device
->tags_list
, tag
, NULL
) != NULL
)
1748 void udev_device_remove_tag(struct udev_device
*udev_device
, const char *tag
)
1750 struct udev_list_entry
*e
;
1752 if (!is_valid_tag(tag
))
1754 e
= udev_list_get_entry(&udev_device
->tags_list
);
1755 e
= udev_list_entry_get_by_name(e
, tag
);
1757 udev_device
->tags_uptodate
= false;
1758 udev_list_entry_delete(e
);
1762 void udev_device_cleanup_tags_list(struct udev_device
*udev_device
)
1764 udev_device
->tags_uptodate
= false;
1765 udev_list_cleanup(&udev_device
->tags_list
);
1769 * udev_device_get_tags_list_entry:
1770 * @udev_device: udev device
1772 * Retrieve the list of tags attached to the udev device. The next
1773 * list entry can be retrieved with udev_list_entry_get_next(),
1774 * which returns #NULL if no more entries exist. The tag string
1775 * can be retrieved from the list entry by udev_list_entry_get_name().
1777 * Returns: the first entry of the tag list
1779 _public_
struct udev_list_entry
*udev_device_get_tags_list_entry(struct udev_device
*udev_device
)
1781 if (udev_device
== NULL
)
1783 if (!udev_device
->info_loaded
)
1784 udev_device_read_db(udev_device
, NULL
);
1785 return udev_list_get_entry(&udev_device
->tags_list
);
1789 * udev_device_has_tag:
1790 * @udev_device: udev device
1793 * Check if a given device has a certain tag associated.
1795 * Returns: 1 if the tag is found. 0 otherwise.
1797 _public_
int udev_device_has_tag(struct udev_device
*udev_device
, const char *tag
)
1799 struct udev_list_entry
*list_entry
;
1801 if (udev_device
== NULL
)
1803 if (!udev_device
->info_loaded
)
1804 udev_device_read_db(udev_device
, NULL
);
1805 list_entry
= udev_device_get_tags_list_entry(udev_device
);
1806 if (udev_list_entry_get_by_name(list_entry
, tag
) != NULL
)
1811 #define ENVP_SIZE 128
1812 #define MONITOR_BUF_SIZE 4096
1813 static int update_envp_monitor_buf(struct udev_device
*udev_device
)
1815 struct udev_list_entry
*list_entry
;
1820 /* monitor buffer of property strings */
1821 free(udev_device
->monitor_buf
);
1822 udev_device
->monitor_buf_len
= 0;
1823 udev_device
->monitor_buf
= malloc(MONITOR_BUF_SIZE
);
1824 if (udev_device
->monitor_buf
== NULL
)
1827 /* envp array, strings will point into monitor buffer */
1828 if (udev_device
->envp
== NULL
)
1829 udev_device
->envp
= malloc(sizeof(char *) * ENVP_SIZE
);
1830 if (udev_device
->envp
== NULL
)
1834 s
= udev_device
->monitor_buf
;
1835 l
= MONITOR_BUF_SIZE
;
1836 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(udev_device
)) {
1839 key
= udev_list_entry_get_name(list_entry
);
1840 /* skip private variables */
1844 /* add string to envp array */
1845 udev_device
->envp
[i
++] = s
;
1846 if (i
+1 >= ENVP_SIZE
)
1849 /* add property string to monitor buffer */
1850 l
= strpcpyl(&s
, l
, key
, "=", udev_list_entry_get_value(list_entry
), NULL
);
1853 /* advance past the trailing '\0' that strpcpyl() guarantees */
1857 udev_device
->envp
[i
] = NULL
;
1858 udev_device
->monitor_buf_len
= s
- udev_device
->monitor_buf
;
1859 udev_device
->envp_uptodate
= true;
1863 char **udev_device_get_properties_envp(struct udev_device
*udev_device
)
1865 if (!udev_device
->envp_uptodate
)
1866 if (update_envp_monitor_buf(udev_device
) != 0)
1868 return udev_device
->envp
;
1871 ssize_t
udev_device_get_properties_monitor_buf(struct udev_device
*udev_device
, const char **buf
)
1873 if (!udev_device
->envp_uptodate
)
1874 if (update_envp_monitor_buf(udev_device
) != 0)
1876 *buf
= udev_device
->monitor_buf
;
1877 return udev_device
->monitor_buf_len
;
1880 int udev_device_set_action(struct udev_device
*udev_device
, const char *action
)
1882 free(udev_device
->action
);
1883 udev_device
->action
= strdup(action
);
1884 if (udev_device
->action
== NULL
)
1886 udev_device_add_property(udev_device
, "ACTION", udev_device
->action
);
1890 int udev_device_get_devlink_priority(struct udev_device
*udev_device
)
1892 if (!udev_device
->info_loaded
)
1893 udev_device_read_db(udev_device
, NULL
);
1894 return udev_device
->devlink_priority
;
1897 int udev_device_set_devlink_priority(struct udev_device
*udev_device
, int prio
)
1899 udev_device
->devlink_priority
= prio
;
1903 int udev_device_get_watch_handle(struct udev_device
*udev_device
)
1905 if (!udev_device
->info_loaded
)
1906 udev_device_read_db(udev_device
, NULL
);
1907 return udev_device
->watch_handle
;
1910 int udev_device_set_watch_handle(struct udev_device
*udev_device
, int handle
)
1912 udev_device
->watch_handle
= handle
;
1916 bool udev_device_get_db_persist(struct udev_device
*udev_device
)
1918 return udev_device
->db_persist
;
1921 void udev_device_set_db_persist(struct udev_device
*udev_device
)
1923 udev_device
->db_persist
= true;
1926 int udev_device_rename(struct udev_device
*udev_device
, const char *name
)
1928 _cleanup_free_
char *dirname
= NULL
;
1932 if (udev_device
== NULL
|| name
== NULL
)
1935 dirname
= dirname_malloc(udev_device
->syspath
);
1939 new_syspath
= strjoina(dirname
, "/", name
);
1941 r
= udev_device_set_syspath(udev_device
, new_syspath
);
1948 struct udev_device
*udev_device_shallow_clone(struct udev_device
*old_device
)
1950 struct udev_device
*device
;
1952 if (old_device
== NULL
)
1955 device
= udev_device_new(old_device
->udev
);
1962 udev_device_set_syspath(device
, udev_device_get_syspath(old_device
));
1963 udev_device_set_subsystem(device
, udev_device_get_subsystem(old_device
));
1964 udev_device_set_devnum(device
, udev_device_get_devnum(old_device
));
1969 struct udev_device
*udev_device_new_from_nulstr(struct udev
*udev
, char *nulstr
, ssize_t buflen
) {
1970 struct udev_device
*device
;
1973 if (nulstr
== NULL
|| buflen
<= 0) {
1979 device
= udev_device_new(udev
);
1986 udev_device_set_info_loaded(device
);
1988 while (bufpos
< buflen
) {
1992 key
= nulstr
+ bufpos
;
1993 keylen
= strlen(key
);
1997 bufpos
+= keylen
+ 1;
1998 udev_device_add_property_from_string_parse(device
, key
);
2001 if (udev_device_add_property_from_string_parse_finish(device
) < 0) {
2002 log_debug("missing values, invalid device");
2004 udev_device_unref(device
);