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Commit | Line | Data |
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eb1f0e66 KS |
1 | /* |
2 | * libudev - interface to udev device information | |
3 | * | |
4 | * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
eb1f0e66 KS |
20 | #include <stdio.h> |
21 | #include <stdlib.h> | |
22 | #include <stddef.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <dirent.h> | |
93b0f384 | 27 | #include <fcntl.h> |
eb1f0e66 KS |
28 | #include <sys/stat.h> |
29 | ||
30 | #include "libudev.h" | |
31 | #include "libudev-private.h" | |
eb1f0e66 | 32 | |
11d543c1 KS |
33 | struct udev_device { |
34 | int refcount; | |
35 | struct udev *udev; | |
b2d9e4f2 | 36 | struct udev_device *parent_device; |
11d543c1 | 37 | char *syspath; |
4ad3a37f KS |
38 | const char *devpath; |
39 | const char *sysname; | |
99214844 | 40 | char *devnode; |
11d543c1 | 41 | char *subsystem; |
e345e267 KS |
42 | struct list_node devlink_list; |
43 | struct list_node properties_list; | |
c4f5f942 | 44 | char *action; |
99214844 | 45 | int event_timeout; |
c4f5f942 KS |
46 | char *driver; |
47 | char *devpath_old; | |
48 | char *physdevpath; | |
49 | int timeout; | |
50 | dev_t devnum; | |
6bd1c78a KS |
51 | unsigned long long int seqnum; |
52 | int num_fake_partitions; | |
e88a82b5 | 53 | int devlink_priority; |
6bd1c78a | 54 | int ignore_remove; |
e345e267 | 55 | struct list_node attr_list; |
99214844 | 56 | int info_loaded; |
11d543c1 KS |
57 | }; |
58 | ||
8753fadf | 59 | static size_t syspath_to_db_path(struct udev_device *udev_device, char *filename, size_t len) |
e88a82b5 KS |
60 | { |
61 | size_t start; | |
62 | ||
63 | /* translate to location of db file */ | |
8753fadf | 64 | util_strlcpy(filename, udev_get_dev_path(udev_device->udev), len); |
3eb46ec6 | 65 | start = util_strlcat(filename, "/.udev/db/", len); |
8753fadf | 66 | util_strlcat(filename, udev_device->devpath, len); |
7a01f11a | 67 | return util_path_encode(&filename[start], len - start); |
e88a82b5 KS |
68 | } |
69 | ||
70 | static int device_read_db(struct udev_device *udev_device) | |
71 | { | |
72 | struct stat stats; | |
3eb46ec6 KS |
73 | char filename[UTIL_PATH_SIZE]; |
74 | char line[UTIL_LINE_SIZE]; | |
e88a82b5 | 75 | FILE *f; |
e88a82b5 | 76 | |
8753fadf | 77 | syspath_to_db_path(udev_device, filename, sizeof(filename)); |
e88a82b5 KS |
78 | |
79 | if (lstat(filename, &stats) != 0) { | |
80 | info(udev_device->udev, "no db file to read %s: %s\n", filename, strerror(errno)); | |
81 | return -1; | |
82 | } | |
83 | if ((stats.st_mode & S_IFMT) == S_IFLNK) { | |
3eb46ec6 | 84 | char target[UTIL_PATH_SIZE]; |
e88a82b5 KS |
85 | int target_len; |
86 | ||
e88a82b5 KS |
87 | target_len = readlink(filename, target, sizeof(target)); |
88 | if (target_len > 0) | |
89 | target[target_len] = '\0'; | |
90 | else { | |
91 | info(udev_device->udev, "error reading db link %s: %s\n", filename, strerror(errno)); | |
92 | return -1; | |
93 | } | |
99214844 | 94 | if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0) |
e88a82b5 | 95 | return -ENOMEM; |
99214844 | 96 | info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode); |
e88a82b5 KS |
97 | return 0; |
98 | } | |
99 | ||
100 | f = fopen(filename, "r"); | |
101 | if (f == NULL) { | |
102 | info(udev_device->udev, "error reading db file %s: %s\n", filename, strerror(errno)); | |
103 | return -1; | |
104 | } | |
105 | while (fgets(line, sizeof(line), f)) { | |
106 | ssize_t len; | |
107 | const char *val; | |
e88a82b5 KS |
108 | |
109 | len = strlen(line); | |
110 | if (len < 4) | |
111 | break; | |
112 | line[len-1] = '\0'; | |
113 | val = &line[2]; | |
114 | ||
115 | switch(line[0]) { | |
116 | case 'N': | |
99214844 | 117 | asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), val); |
e88a82b5 | 118 | break; |
e88a82b5 | 119 | case 'S': |
3eb46ec6 KS |
120 | util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename)); |
121 | util_strlcat(filename, "/", sizeof(filename)); | |
122 | util_strlcat(filename, val, sizeof(filename)); | |
e88a82b5 KS |
123 | device_add_devlink(udev_device, filename); |
124 | break; | |
125 | case 'L': | |
126 | device_set_devlink_priority(udev_device, atoi(val)); | |
127 | break; | |
128 | case 'T': | |
99214844 | 129 | device_set_event_timeout(udev_device, atoi(val)); |
e88a82b5 KS |
130 | break; |
131 | case 'A': | |
132 | device_set_num_fake_partitions(udev_device, atoi(val)); | |
133 | break; | |
134 | case 'R': | |
135 | device_set_ignore_remove(udev_device, atoi(val)); | |
136 | break; | |
137 | case 'E': | |
0518da3b | 138 | device_add_property_from_string(udev_device, val); |
e88a82b5 KS |
139 | break; |
140 | } | |
141 | } | |
142 | fclose(f); | |
143 | ||
cd42b50d | 144 | info(udev_device->udev, "device %p filled with db file data\n", udev_device); |
04f5d75f | 145 | return 0; |
e88a82b5 KS |
146 | } |
147 | ||
99214844 KS |
148 | static int device_read_uevent_file(struct udev_device *udev_device) |
149 | { | |
150 | char filename[UTIL_PATH_SIZE]; | |
151 | FILE *f; | |
152 | char line[UTIL_LINE_SIZE]; | |
153 | int maj = 0; | |
154 | int min = 0; | |
155 | ||
156 | util_strlcpy(filename, udev_device->syspath, sizeof(filename)); | |
157 | util_strlcat(filename, "/uevent", sizeof(filename)); | |
158 | f = fopen(filename, "r"); | |
159 | if (f == NULL) | |
160 | return -1; | |
161 | ||
162 | while (fgets(line, sizeof(line), f)) { | |
163 | char *pos; | |
164 | ||
165 | pos = strchr(line, '\n'); | |
166 | if (pos == NULL) | |
167 | continue; | |
168 | pos[0] = '\0'; | |
169 | ||
170 | if (strncmp(line, "MAJOR=", 6) == 0) | |
171 | maj = strtoull(&line[6], NULL, 10); | |
172 | else if (strncmp(line, "MINOR=", 6) == 0) | |
173 | min = strtoull(&line[6], NULL, 10); | |
174 | ||
175 | device_add_property_from_string(udev_device, line); | |
176 | } | |
177 | ||
178 | udev_device->devnum = makedev(maj, min); | |
179 | ||
180 | fclose(f); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static void device_load_info(struct udev_device *device) | |
185 | { | |
186 | device_read_uevent_file(device); | |
187 | device_read_db(device); | |
188 | device->info_loaded = 1; | |
189 | } | |
190 | ||
191 | void device_set_info_loaded(struct udev_device *device) | |
192 | { | |
193 | device->info_loaded = 1; | |
194 | } | |
195 | ||
ba6929f6 | 196 | struct udev_device *device_init(struct udev *udev) |
eb1f0e66 KS |
197 | { |
198 | struct udev_device *udev_device; | |
199 | ||
ba6929f6 KS |
200 | if (udev == NULL) |
201 | return NULL; | |
202 | ||
eb1f0e66 KS |
203 | udev_device = malloc(sizeof(struct udev_device)); |
204 | if (udev_device == NULL) | |
205 | return NULL; | |
206 | memset(udev_device, 0x00, sizeof(struct udev_device)); | |
207 | udev_device->refcount = 1; | |
208 | udev_device->udev = udev; | |
e345e267 KS |
209 | list_init(&udev_device->devlink_list); |
210 | list_init(&udev_device->properties_list); | |
211 | list_init(&udev_device->attr_list); | |
7d563a17 | 212 | info(udev_device->udev, "udev_device: %p created\n", udev_device); |
eb1f0e66 KS |
213 | return udev_device; |
214 | } | |
215 | ||
216 | /** | |
8753fadf | 217 | * udev_device_new_from_syspath: |
eb1f0e66 | 218 | * @udev: udev library context |
8753fadf | 219 | * @syspath: sys device path including sys directory |
eb1f0e66 | 220 | * |
8753fadf KS |
221 | * Create new udev device, and fill in information from the sys |
222 | * device and the udev database entry. The sypath is the absolute | |
223 | * path to the device, including the sys mount point. | |
eb1f0e66 KS |
224 | * |
225 | * The initial refcount is 1, and needs to be decremented to | |
226 | * release the ressources of the udev device. | |
227 | * | |
228 | * Returns: a new udev device, or #NULL, if it does not exist | |
229 | **/ | |
8753fadf | 230 | struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) |
eb1f0e66 | 231 | { |
b95f8a76 KS |
232 | size_t len; |
233 | const char *subdir; | |
234 | const char *pos; | |
3eb46ec6 | 235 | char path[UTIL_PATH_SIZE]; |
eb1f0e66 KS |
236 | struct stat statbuf; |
237 | struct udev_device *udev_device; | |
eb1f0e66 | 238 | |
ba6929f6 KS |
239 | if (udev == NULL) |
240 | return NULL; | |
8753fadf | 241 | if (syspath == NULL) |
ba6929f6 KS |
242 | return NULL; |
243 | ||
b95f8a76 KS |
244 | /* path starts in sys */ |
245 | len = strlen(udev_get_sys_path(udev)); | |
246 | if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) { | |
247 | info(udev, "not in sys :%s\n", syspath); | |
eb1f0e66 | 248 | return NULL; |
4ad3a37f | 249 | } |
eb1f0e66 | 250 | |
b95f8a76 KS |
251 | /* path is not a root directory */ |
252 | subdir = &syspath[len+1]; | |
253 | pos = strrchr(subdir, '/'); | |
254 | if (pos == NULL || pos < &subdir[2]) { | |
bc8184ed | 255 | info(udev, "not a subdir :%s\n", syspath); |
eb1f0e66 | 256 | return NULL; |
b95f8a76 | 257 | } |
eb1f0e66 | 258 | |
ba6929f6 | 259 | /* resolve possible symlink to real path */ |
8753fadf | 260 | util_strlcpy(path, syspath, sizeof(path)); |
b21b95d7 | 261 | util_resolve_sys_link(udev, path, sizeof(path)); |
b95f8a76 KS |
262 | |
263 | /* path exists in sys */ | |
264 | if (strncmp(&syspath[len], "/devices/", 9) == 0 || | |
265 | strncmp(&syspath[len], "/class/", 7) == 0 || | |
266 | strncmp(&syspath[len], "/block/", 7) == 0) { | |
267 | char file[UTIL_PATH_SIZE]; | |
268 | ||
269 | /* all "devices" require a "uevent" file */ | |
270 | util_strlcpy(file, path, sizeof(file)); | |
271 | util_strlcat(file, "/uevent", sizeof(file)); | |
272 | if (stat(file, &statbuf) != 0) { | |
273 | info(udev, "not a device: %s\n", syspath); | |
274 | return NULL; | |
275 | } | |
276 | } else { | |
277 | /* everything else just needs to be a directory */ | |
278 | if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) { | |
279 | info(udev, "directory not found: %s\n", syspath); | |
280 | return NULL; | |
281 | } | |
282 | } | |
283 | ||
284 | udev_device = device_init(udev); | |
285 | if (udev_device == NULL) | |
286 | return NULL; | |
287 | ||
8753fadf | 288 | device_set_syspath(udev_device, path); |
7d563a17 | 289 | info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device)); |
eb1f0e66 | 290 | |
eb1f0e66 KS |
291 | return udev_device; |
292 | } | |
293 | ||
4c9dff47 KS |
294 | struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum) |
295 | { | |
296 | char path[UTIL_PATH_SIZE]; | |
03198b93 | 297 | const char *type_str; |
438d4c3c | 298 | struct udev_enumerate *udev_enumerate; |
0de33a61 | 299 | struct udev_list_entry *list_entry; |
bf7ad0ea | 300 | struct udev_device *device = NULL; |
03198b93 KS |
301 | |
302 | if (type == 'b') | |
303 | type_str = "block"; | |
304 | else if (type == 'c') | |
305 | type_str = "char"; | |
306 | else | |
307 | return NULL; | |
4c9dff47 | 308 | |
b95f8a76 | 309 | /* /sys/dev/{block,char}/<maj>:<min> link */ |
03198b93 KS |
310 | snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev), |
311 | type_str, major(devnum), minor(devnum)); | |
bf7ad0ea KS |
312 | if (util_resolve_sys_link(udev, path, sizeof(path)) == 0) |
313 | return udev_device_new_from_syspath(udev, path); | |
4c9dff47 | 314 | |
438d4c3c KS |
315 | udev_enumerate = udev_enumerate_new(udev); |
316 | if (udev_enumerate == NULL) | |
317 | return NULL; | |
318 | ||
bc8184ed KS |
319 | /* fallback to search sys devices for the major/minor */ |
320 | if (type == 'b') | |
438d4c3c | 321 | udev_enumerate_scan_devices(udev_enumerate, "block", NULL); |
bc8184ed | 322 | else if (type == 'c') |
438d4c3c KS |
323 | udev_enumerate_scan_devices(udev_enumerate, "!block", NULL); |
324 | udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) { | |
bf7ad0ea KS |
325 | struct udev_device *device_loop; |
326 | ||
0de33a61 | 327 | device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry)); |
bf7ad0ea KS |
328 | if (device_loop != NULL) { |
329 | if (udev_device_get_devnum(device_loop) == devnum) { | |
bc8184ed KS |
330 | const char *subsystem; |
331 | ||
332 | subsystem = udev_device_get_subsystem(device_loop); | |
333 | if (type == 'b' && strcmp(subsystem, "block") != 0) | |
334 | continue; | |
335 | if (type == 'c' && strcmp(subsystem, "block") == 0) | |
336 | continue; | |
bf7ad0ea KS |
337 | device = device_loop; |
338 | break; | |
339 | } | |
340 | udev_device_unref(device_loop); | |
341 | } | |
bf7ad0ea | 342 | } |
438d4c3c | 343 | udev_enumerate_unref(udev_enumerate); |
bf7ad0ea | 344 | return device; |
4c9dff47 KS |
345 | } |
346 | ||
b2d9e4f2 | 347 | static struct udev_device *device_new_from_parent(struct udev_device *udev_device) |
4ad3a37f KS |
348 | { |
349 | struct udev_device *udev_device_parent = NULL; | |
350 | char path[UTIL_PATH_SIZE]; | |
b95f8a76 | 351 | const char *subdir; |
4ad3a37f | 352 | |
b95f8a76 KS |
353 | /* follow "device" link in deprecated sys layout */ |
354 | if (strncmp(udev_device->devpath, "/class/", 7) == 0 || | |
355 | strncmp(udev_device->devpath, "/block/", 7) == 0) { | |
356 | util_strlcpy(path, udev_device->syspath, sizeof(path)); | |
357 | util_strlcat(path, "/device", sizeof(path)); | |
358 | if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) | |
359 | udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); | |
360 | return udev_device_parent; | |
361 | } | |
4ad3a37f | 362 | |
8753fadf | 363 | util_strlcpy(path, udev_device->syspath, sizeof(path)); |
b95f8a76 | 364 | subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1]; |
4ad3a37f | 365 | while (1) { |
b95f8a76 KS |
366 | char *pos; |
367 | ||
368 | pos = strrchr(subdir, '/'); | |
369 | if (pos == NULL || pos < &subdir[2]) | |
4ad3a37f KS |
370 | break; |
371 | pos[0] = '\0'; | |
8753fadf | 372 | udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path); |
4ad3a37f | 373 | if (udev_device_parent != NULL) |
0518da3b KS |
374 | return udev_device_parent; |
375 | } | |
0518da3b | 376 | return NULL; |
4ad3a37f KS |
377 | } |
378 | ||
b2d9e4f2 KS |
379 | struct udev_device *udev_device_get_parent(struct udev_device *udev_device) |
380 | { | |
b95f8a76 KS |
381 | if (udev_device == NULL) |
382 | return NULL; | |
383 | ||
0518da3b KS |
384 | if (udev_device->parent_device != NULL) { |
385 | info(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device); | |
386 | return udev_device->parent_device; | |
387 | } | |
388 | udev_device->parent_device = device_new_from_parent(udev_device); | |
b2d9e4f2 KS |
389 | return udev_device->parent_device; |
390 | } | |
391 | ||
eb1f0e66 KS |
392 | /** |
393 | * udev_device_get_udev: | |
7d8787b3 | 394 | * @udev_device: udev device |
eb1f0e66 KS |
395 | * |
396 | * Retrieve the udev library context the device was created with. | |
397 | * | |
398 | * Returns: the udev library context | |
399 | **/ | |
400 | struct udev *udev_device_get_udev(struct udev_device *udev_device) | |
401 | { | |
ba6929f6 KS |
402 | if (udev_device == NULL) |
403 | return NULL; | |
eb1f0e66 KS |
404 | return udev_device->udev; |
405 | } | |
406 | ||
407 | /** | |
408 | * udev_device_ref: | |
409 | * @udev_device: udev device | |
410 | * | |
411 | * Take a reference of a udev device. | |
412 | * | |
413 | * Returns: the passed udev device | |
414 | **/ | |
415 | struct udev_device *udev_device_ref(struct udev_device *udev_device) | |
416 | { | |
ba6929f6 KS |
417 | if (udev_device == NULL) |
418 | return NULL; | |
eb1f0e66 KS |
419 | udev_device->refcount++; |
420 | return udev_device; | |
421 | } | |
422 | ||
423 | /** | |
424 | * udev_device_unref: | |
425 | * @udev_device: udev device | |
426 | * | |
427 | * Drop a reference of a udev device. If the refcount reaches zero, | |
428 | * the ressources of the device will be released. | |
429 | * | |
430 | **/ | |
431 | void udev_device_unref(struct udev_device *udev_device) | |
432 | { | |
ba6929f6 KS |
433 | if (udev_device == NULL) |
434 | return; | |
eb1f0e66 KS |
435 | udev_device->refcount--; |
436 | if (udev_device->refcount > 0) | |
437 | return; | |
b2d9e4f2 KS |
438 | if (udev_device->parent_device != NULL) |
439 | udev_device_unref(udev_device->parent_device); | |
11d543c1 | 440 | free(udev_device->syspath); |
99214844 | 441 | free(udev_device->devnode); |
ba6929f6 | 442 | free(udev_device->subsystem); |
99214844 | 443 | list_cleanup(udev_device->udev, &udev_device->devlink_list); |
bf7ad0ea | 444 | list_cleanup(udev_device->udev, &udev_device->properties_list); |
1c7047ea KS |
445 | free(udev_device->action); |
446 | free(udev_device->driver); | |
447 | free(udev_device->devpath_old); | |
448 | free(udev_device->physdevpath); | |
bf7ad0ea | 449 | list_cleanup(udev_device->udev, &udev_device->attr_list); |
7d563a17 | 450 | info(udev_device->udev, "udev_device: %p released\n", udev_device); |
eb1f0e66 KS |
451 | free(udev_device); |
452 | } | |
453 | ||
454 | /** | |
455 | * udev_device_get_devpath: | |
456 | * @udev_device: udev device | |
457 | * | |
11d543c1 KS |
458 | * Retrieve the kernel devpath value of the udev device. The path |
459 | * does not contain the sys mount point, and starts with a '/'. | |
eb1f0e66 | 460 | * |
11d543c1 | 461 | * Returns: the devpath of the udev device |
eb1f0e66 KS |
462 | **/ |
463 | const char *udev_device_get_devpath(struct udev_device *udev_device) | |
464 | { | |
ba6929f6 KS |
465 | if (udev_device == NULL) |
466 | return NULL; | |
467 | return udev_device->devpath; | |
eb1f0e66 KS |
468 | } |
469 | ||
11d543c1 KS |
470 | /** |
471 | * udev_device_get_syspath: | |
472 | * @udev_device: udev device | |
473 | * | |
474 | * Retrieve the sys path of the udev device. The path is an | |
475 | * absolute path and starts with the sys mount point. | |
476 | * | |
477 | * Returns: the sys path of the udev device | |
478 | **/ | |
479 | const char *udev_device_get_syspath(struct udev_device *udev_device) | |
480 | { | |
481 | if (udev_device == NULL) | |
482 | return NULL; | |
483 | return udev_device->syspath; | |
484 | } | |
485 | ||
4ad3a37f KS |
486 | const char *udev_device_get_sysname(struct udev_device *udev_device) |
487 | { | |
488 | if (udev_device == NULL) | |
489 | return NULL; | |
490 | return udev_device->sysname; | |
491 | } | |
492 | ||
eb1f0e66 | 493 | /** |
fb762bb9 | 494 | * udev_device_get_devnode: |
eb1f0e66 KS |
495 | * @udev_device: udev device |
496 | * | |
497 | * Retrieve the device node file name belonging to the udev device. | |
ba6929f6 | 498 | * The path is an absolute path, and starts with the device directory. |
eb1f0e66 KS |
499 | * |
500 | * Returns: the device node file name of the udev device, or #NULL if no device node exists | |
501 | **/ | |
fb762bb9 | 502 | const char *udev_device_get_devnode(struct udev_device *udev_device) |
eb1f0e66 | 503 | { |
ba6929f6 | 504 | if (udev_device == NULL) |
eb1f0e66 | 505 | return NULL; |
99214844 KS |
506 | if (!udev_device->info_loaded) |
507 | device_load_info(udev_device); | |
508 | return udev_device->devnode; | |
eb1f0e66 KS |
509 | } |
510 | ||
511 | /** | |
512 | * udev_device_get_subsystem: | |
513 | * @udev_device: udev device | |
514 | * | |
515 | * Retrieve the subsystem string of the udev device. The string does not | |
516 | * contain any "/". | |
517 | * | |
518 | * Returns: the subsystem name of the udev device, or #NULL if it can not be determined | |
519 | **/ | |
520 | const char *udev_device_get_subsystem(struct udev_device *udev_device) | |
521 | { | |
17fcfb59 | 522 | char subsystem[UTIL_NAME_SIZE]; |
ba6929f6 KS |
523 | |
524 | if (udev_device == NULL) | |
525 | return NULL; | |
526 | if (udev_device->subsystem != NULL) | |
527 | return udev_device->subsystem; | |
0518da3b KS |
528 | |
529 | /* read "subsytem" link */ | |
279595bd | 530 | if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) { |
0518da3b KS |
531 | udev_device->subsystem = strdup(subsystem); |
532 | return udev_device->subsystem; | |
533 | } | |
534 | ||
535 | /* implicit names */ | |
536 | if (strncmp(udev_device->devpath, "/module/", 8) == 0) { | |
537 | udev_device->subsystem = strdup("module"); | |
538 | return udev_device->subsystem; | |
539 | } | |
540 | if (strstr(udev_device->devpath, "/drivers/") != NULL) { | |
541 | udev_device->subsystem = strdup("drivers"); | |
542 | return udev_device->subsystem; | |
543 | } | |
544 | if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 || | |
545 | strncmp(udev_device->devpath, "/class/", 7) == 0 || | |
546 | strncmp(udev_device->devpath, "/bus/", 5) == 0) { | |
547 | udev_device->subsystem = strdup("subsystem"); | |
548 | return udev_device->subsystem; | |
549 | } | |
550 | return NULL; | |
eb1f0e66 KS |
551 | } |
552 | ||
553 | /** | |
0de33a61 | 554 | * udev_device_get_devlinks_list_entry: |
eb1f0e66 | 555 | * @udev_device: udev device |
eb1f0e66 | 556 | * |
bf7ad0ea KS |
557 | * Retrieve the list of device links pointing to the device file of |
558 | * the udev device. The next list entry can be retrieved with | |
e345e267 | 559 | * udev_list_entry_next(), which returns #NULL if no more entries exist. |
bf7ad0ea | 560 | * The devlink path can be retrieved from the list entry by |
e345e267 | 561 | * udev_list_entry_get_name(). The path is an absolute path, and starts with |
bf7ad0ea | 562 | * the device directory. |
eb1f0e66 | 563 | * |
bf7ad0ea | 564 | * Returns: the first entry of the device node link list |
eb1f0e66 | 565 | **/ |
0de33a61 | 566 | struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 567 | { |
99214844 KS |
568 | if (udev_device == NULL) |
569 | return NULL; | |
570 | if (!udev_device->info_loaded) | |
571 | device_load_info(udev_device); | |
572 | return list_get_entry(&udev_device->devlink_list); | |
eb1f0e66 KS |
573 | } |
574 | ||
575 | /** | |
0de33a61 | 576 | * udev_device_get_properties_list_entry: |
eb1f0e66 | 577 | * @udev_device: udev device |
eb1f0e66 | 578 | * |
bf7ad0ea | 579 | * Retrieve the list of key/value device properties of the udev |
e345e267 | 580 | * device. The next list entry can be retrieved with udev_list_entry_next(), |
bf7ad0ea KS |
581 | * which returns #NULL if no more entries exist. The property name |
582 | * can be retrieved from the list entry by udev_list_get_name(), | |
583 | * the property value by udev_list_get_value(). | |
eb1f0e66 | 584 | * |
bf7ad0ea | 585 | * Returns: the first entry of the property list |
eb1f0e66 | 586 | **/ |
0de33a61 | 587 | struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device) |
eb1f0e66 | 588 | { |
99214844 KS |
589 | if (udev_device == NULL) |
590 | return NULL; | |
591 | if (!udev_device->info_loaded) | |
592 | device_load_info(udev_device); | |
bf7ad0ea | 593 | return list_get_entry(&udev_device->properties_list); |
eb1f0e66 | 594 | } |
11d543c1 | 595 | |
c4f5f942 KS |
596 | const char *udev_device_get_driver(struct udev_device *udev_device) |
597 | { | |
17fcfb59 | 598 | char driver[UTIL_NAME_SIZE]; |
95d90c4f | 599 | |
c4f5f942 KS |
600 | if (udev_device == NULL) |
601 | return NULL; | |
95d90c4f KS |
602 | if (udev_device->driver != NULL) |
603 | return udev_device->driver; | |
8753fadf | 604 | if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) < 2) |
95d90c4f KS |
605 | return NULL; |
606 | udev_device->driver = strdup(driver); | |
c4f5f942 KS |
607 | return udev_device->driver; |
608 | } | |
609 | ||
610 | dev_t udev_device_get_devnum(struct udev_device *udev_device) | |
611 | { | |
612 | if (udev_device == NULL) | |
613 | return makedev(0, 0); | |
99214844 KS |
614 | if (!udev_device->info_loaded) |
615 | device_load_info(udev_device); | |
c4f5f942 KS |
616 | return udev_device->devnum; |
617 | } | |
618 | ||
619 | const char *udev_device_get_action(struct udev_device *udev_device) | |
620 | { | |
621 | if (udev_device == NULL) | |
622 | return NULL; | |
623 | return udev_device->action; | |
624 | } | |
625 | ||
37372bbc KS |
626 | unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device) |
627 | { | |
628 | if (udev_device == NULL) | |
629 | return 0; | |
630 | return udev_device->seqnum; | |
631 | } | |
632 | ||
93b0f384 KS |
633 | const char *udev_device_get_attr_value(struct udev_device *udev_device, const char *attr) |
634 | { | |
0de33a61 | 635 | struct udev_list_entry *list_entry; |
93b0f384 KS |
636 | char path[UTIL_PATH_SIZE]; |
637 | char value[UTIL_NAME_SIZE]; | |
638 | struct stat statbuf; | |
639 | int fd; | |
640 | ssize_t size; | |
641 | const char *val = NULL; | |
642 | ||
0518da3b | 643 | /* look for possibly already cached result */ |
0de33a61 KS |
644 | udev_list_entry_foreach(list_entry, list_get_entry(&udev_device->attr_list)) { |
645 | if (strcmp(udev_list_entry_get_name(list_entry), attr) == 0) { | |
646 | info(udev_device->udev, "got '%s' (%s) from cache\n", attr, udev_list_entry_get_value(list_entry)); | |
647 | return udev_list_entry_get_value(list_entry); | |
0518da3b KS |
648 | } |
649 | } | |
650 | ||
93b0f384 KS |
651 | util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path)); |
652 | util_strlcat(path, "/", sizeof(path)); | |
653 | util_strlcat(path, attr, sizeof(path)); | |
654 | ||
655 | if (lstat(path, &statbuf) != 0) { | |
656 | info(udev_device->udev, "stat '%s' failed: %s\n", path, strerror(errno)); | |
657 | goto out; | |
658 | } | |
659 | ||
660 | if (S_ISLNK(statbuf.st_mode)) { | |
661 | /* links return the last element of the target path */ | |
662 | char target[UTIL_NAME_SIZE]; | |
663 | int len; | |
664 | char *pos; | |
665 | ||
666 | len = readlink(path, target, sizeof(target)); | |
667 | if (len > 0) { | |
668 | target[len] = '\0'; | |
669 | pos = strrchr(target, '/'); | |
670 | if (pos != NULL) { | |
671 | pos = &pos[1]; | |
672 | info(udev_device->udev, "cache '%s' with link value '%s'\n", attr, pos); | |
0de33a61 KS |
673 | list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, pos, 0, 0); |
674 | val = udev_list_entry_get_value(list_entry); | |
93b0f384 KS |
675 | } |
676 | } | |
677 | goto out; | |
678 | } | |
679 | ||
680 | /* skip directories */ | |
681 | if (S_ISDIR(statbuf.st_mode)) | |
682 | goto out; | |
683 | ||
684 | /* skip non-readable files */ | |
685 | if ((statbuf.st_mode & S_IRUSR) == 0) | |
686 | goto out; | |
687 | ||
688 | /* read attribute value */ | |
689 | fd = open(path, O_RDONLY); | |
690 | if (fd < 0) { | |
691 | info(udev_device->udev, "attribute '%s' can not be opened\n", path); | |
692 | goto out; | |
693 | } | |
694 | size = read(fd, value, sizeof(value)); | |
695 | close(fd); | |
696 | if (size < 0) | |
697 | goto out; | |
698 | if (size == sizeof(value)) | |
699 | goto out; | |
700 | ||
0518da3b | 701 | /* got a valid value, store it in cache and return it */ |
93b0f384 KS |
702 | value[size] = '\0'; |
703 | util_remove_trailing_chars(value, '\n'); | |
704 | info(udev_device->udev, "'%s' has attribute value '%s'\n", path, value); | |
0de33a61 KS |
705 | list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, value, 0, 0); |
706 | val = udev_list_entry_get_value(list_entry); | |
93b0f384 KS |
707 | out: |
708 | return val; | |
709 | } | |
8753fadf | 710 | int device_set_syspath(struct udev_device *udev_device, const char *syspath) |
11d543c1 | 711 | { |
8753fadf KS |
712 | const char *pos; |
713 | ||
714 | udev_device->syspath = strdup(syspath); | |
715 | if (udev_device->syspath == NULL) | |
11d543c1 KS |
716 | return -ENOMEM; |
717 | udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))]; | |
8753fadf KS |
718 | pos = strrchr(udev_device->syspath, '/'); |
719 | if (pos == NULL) | |
720 | return -EINVAL; | |
721 | udev_device->sysname = &pos[1]; | |
11d543c1 KS |
722 | return 0; |
723 | } | |
724 | ||
725 | int device_set_subsystem(struct udev_device *udev_device, const char *subsystem) | |
726 | { | |
727 | udev_device->subsystem = strdup(subsystem); | |
728 | if (udev_device->subsystem == NULL) | |
729 | return -1; | |
730 | return 0; | |
731 | } | |
732 | ||
99214844 | 733 | int device_set_devnode(struct udev_device *udev_device, const char *devnode) |
11d543c1 | 734 | { |
99214844 KS |
735 | udev_device->devnode = strdup(devnode); |
736 | if (udev_device->devnode == NULL) | |
11d543c1 KS |
737 | return -ENOMEM; |
738 | return 0; | |
739 | } | |
740 | ||
741 | int device_add_devlink(struct udev_device *udev_device, const char *devlink) | |
742 | { | |
0de33a61 | 743 | if (list_entry_add(udev_device->udev, &udev_device->devlink_list, devlink, NULL, 1, 0) == NULL) |
11d543c1 KS |
744 | return -ENOMEM; |
745 | return 0; | |
746 | } | |
747 | ||
0518da3b | 748 | int device_add_property(struct udev_device *udev_device, const char *key, const char *value) |
11d543c1 | 749 | { |
0de33a61 | 750 | if (list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0) == NULL) |
11d543c1 KS |
751 | return -ENOMEM; |
752 | return 0; | |
753 | } | |
c4f5f942 | 754 | |
0518da3b KS |
755 | int device_add_property_from_string(struct udev_device *udev_device, const char *property) |
756 | { | |
757 | char name[UTIL_PATH_SIZE]; | |
758 | char *val; | |
759 | ||
760 | strncpy(name, property, sizeof(name)); | |
761 | val = strchr(name, '='); | |
762 | if (val == NULL) | |
763 | return -1; | |
764 | val[0] = '\0'; | |
765 | val = &val[1]; | |
766 | if (val[0] == '\0') | |
767 | val = NULL; | |
768 | device_add_property(udev_device, name, val); | |
769 | return 0; | |
770 | } | |
771 | ||
c4f5f942 KS |
772 | int device_set_action(struct udev_device *udev_device, const char *action) |
773 | { | |
774 | udev_device->action = strdup(action); | |
775 | if (udev_device->action == NULL) | |
776 | return -ENOMEM; | |
777 | return 0; | |
778 | } | |
779 | ||
780 | int device_set_driver(struct udev_device *udev_device, const char *driver) | |
781 | { | |
782 | udev_device->driver = strdup(driver); | |
783 | if (udev_device->driver == NULL) | |
784 | return -ENOMEM; | |
785 | return 0; | |
786 | } | |
787 | ||
788 | const char *device_get_devpath_old(struct udev_device *udev_device) | |
789 | { | |
c4f5f942 KS |
790 | return udev_device->devpath_old; |
791 | } | |
792 | ||
793 | int device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old) | |
794 | { | |
795 | udev_device->devpath_old = strdup(devpath_old); | |
796 | if (udev_device->devpath_old == NULL) | |
797 | return -ENOMEM; | |
798 | return 0; | |
799 | } | |
800 | ||
801 | const char *device_get_physdevpath(struct udev_device *udev_device) | |
802 | { | |
c4f5f942 KS |
803 | return udev_device->physdevpath; |
804 | } | |
805 | ||
806 | int device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath) | |
807 | { | |
808 | udev_device->physdevpath = strdup(physdevpath); | |
809 | if (udev_device->physdevpath == NULL) | |
810 | return -ENOMEM; | |
811 | return 0; | |
812 | } | |
813 | ||
814 | int device_get_timeout(struct udev_device *udev_device) | |
815 | { | |
c4f5f942 KS |
816 | return udev_device->timeout; |
817 | } | |
818 | ||
819 | int device_set_timeout(struct udev_device *udev_device, int timeout) | |
820 | { | |
821 | udev_device->timeout = timeout; | |
822 | return 0; | |
823 | } | |
99214844 KS |
824 | int device_get_event_timeout(struct udev_device *udev_device) |
825 | { | |
826 | if (!udev_device->info_loaded) | |
827 | device_load_info(udev_device); | |
828 | return udev_device->event_timeout; | |
829 | } | |
830 | ||
831 | int device_set_event_timeout(struct udev_device *udev_device, int event_timeout) | |
832 | { | |
833 | udev_device->event_timeout = event_timeout; | |
834 | return 0; | |
835 | } | |
c4f5f942 | 836 | |
37372bbc KS |
837 | int device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum) |
838 | { | |
839 | udev_device->seqnum = seqnum; | |
840 | return 0; | |
841 | } | |
842 | ||
c4f5f942 KS |
843 | int device_set_devnum(struct udev_device *udev_device, dev_t devnum) |
844 | { | |
845 | udev_device->devnum = devnum; | |
846 | return 0; | |
847 | } | |
6bd1c78a KS |
848 | |
849 | int device_get_num_fake_partitions(struct udev_device *udev_device) | |
850 | { | |
99214844 KS |
851 | if (!udev_device->info_loaded) |
852 | device_load_info(udev_device); | |
6bd1c78a KS |
853 | return udev_device->num_fake_partitions; |
854 | } | |
855 | ||
856 | int device_set_num_fake_partitions(struct udev_device *udev_device, int num) | |
857 | { | |
858 | udev_device->num_fake_partitions = num; | |
e88a82b5 | 859 | return 0; |
6bd1c78a KS |
860 | } |
861 | ||
e88a82b5 | 862 | int device_get_devlink_priority(struct udev_device *udev_device) |
6bd1c78a | 863 | { |
99214844 KS |
864 | if (!udev_device->info_loaded) |
865 | device_load_info(udev_device); | |
e88a82b5 | 866 | return udev_device->devlink_priority; |
6bd1c78a KS |
867 | } |
868 | ||
e88a82b5 | 869 | int device_set_devlink_priority(struct udev_device *udev_device, int prio) |
6bd1c78a | 870 | { |
e88a82b5 KS |
871 | udev_device->devlink_priority = prio; |
872 | return 0; | |
6bd1c78a KS |
873 | } |
874 | ||
875 | int device_get_ignore_remove(struct udev_device *udev_device) | |
876 | { | |
99214844 KS |
877 | if (!udev_device->info_loaded) |
878 | device_load_info(udev_device); | |
6bd1c78a KS |
879 | return udev_device->ignore_remove; |
880 | } | |
881 | ||
882 | int device_set_ignore_remove(struct udev_device *udev_device, int ignore) | |
883 | { | |
e88a82b5 KS |
884 | udev_device->ignore_remove = ignore; |
885 | return 0; | |
6bd1c78a | 886 | } |
e88a82b5 | 887 |