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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> | |
27 | #include <sys/stat.h> | |
28 | ||
29 | #include "libudev.h" | |
30 | #include "libudev-private.h" | |
eb1f0e66 | 31 | |
bf7ad0ea KS |
32 | struct udev_enumerate { |
33 | struct udev *udev; | |
34 | int refcount; | |
e345e267 | 35 | struct list_node devices_list; |
bf7ad0ea KS |
36 | }; |
37 | ||
38 | struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate) | |
39 | { | |
40 | if (udev_enumerate == NULL) | |
41 | return NULL; | |
42 | udev_enumerate->refcount++; | |
43 | return udev_enumerate; | |
44 | } | |
45 | ||
46 | void udev_enumerate_unref(struct udev_enumerate *udev_enumerate) | |
47 | { | |
48 | if (udev_enumerate == NULL) | |
49 | return; | |
50 | udev_enumerate->refcount--; | |
51 | if (udev_enumerate->refcount > 0) | |
52 | return; | |
53 | list_cleanup(udev_enumerate->udev, &udev_enumerate->devices_list); | |
54 | free(udev_enumerate); | |
55 | } | |
56 | ||
bc8184ed KS |
57 | struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate) |
58 | { | |
59 | if (udev_enumerate == NULL) | |
60 | return NULL; | |
61 | return udev_enumerate->udev; | |
62 | } | |
63 | ||
0de33a61 | 64 | struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate) |
bf7ad0ea KS |
65 | { |
66 | if (udev_enumerate == NULL) | |
67 | return NULL; | |
68 | return list_get_entry(&udev_enumerate->devices_list); | |
69 | } | |
70 | ||
eb1f0e66 KS |
71 | static int devices_scan_subsystem(struct udev *udev, |
72 | const char *basedir, const char *subsystem, const char *subdir, | |
bc8184ed | 73 | struct list_node *devices_list) |
eb1f0e66 | 74 | { |
3eb46ec6 | 75 | char path[UTIL_PATH_SIZE]; |
eb1f0e66 KS |
76 | DIR *dir; |
77 | struct dirent *dent; | |
eb1f0e66 | 78 | |
8753fadf | 79 | util_strlcpy(path, udev_get_sys_path(udev), sizeof(path)); |
3eb46ec6 | 80 | util_strlcat(path, basedir, sizeof(path)); |
6f67f1df KS |
81 | if (subsystem != NULL) { |
82 | util_strlcat(path, "/", sizeof(path)); | |
83 | util_strlcat(path, subsystem, sizeof(path)); | |
84 | } | |
eb1f0e66 | 85 | if (subdir != NULL) |
3eb46ec6 | 86 | util_strlcat(path, subdir, sizeof(path)); |
eb1f0e66 KS |
87 | dir = opendir(path); |
88 | if (dir == NULL) | |
89 | return -1; | |
90 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
8753fadf | 91 | char syspath[UTIL_PATH_SIZE]; |
b03e89cf | 92 | char filename[UTIL_PATH_SIZE]; |
6f67f1df | 93 | struct stat statbuf; |
eb1f0e66 KS |
94 | |
95 | if (dent->d_name[0] == '.') | |
96 | continue; | |
8753fadf KS |
97 | util_strlcpy(syspath, path, sizeof(syspath)); |
98 | util_strlcat(syspath, "/", sizeof(syspath)); | |
99 | util_strlcat(syspath, dent->d_name, sizeof(syspath)); | |
b03e89cf KS |
100 | util_strlcpy(filename, syspath, sizeof(filename)); |
101 | util_strlcat(filename, "/uevent", sizeof(filename)); | |
102 | if (stat(filename, &statbuf) != 0) | |
6f67f1df | 103 | continue; |
8753fadf | 104 | util_resolve_sys_link(udev, syspath, sizeof(syspath)); |
bc8184ed | 105 | list_entry_add(udev, devices_list, syspath, NULL, 1, 1); |
eb1f0e66 KS |
106 | } |
107 | closedir(dir); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static int devices_scan_subsystems(struct udev *udev, | |
bc8184ed KS |
112 | const char *basedir, const char *subdir, |
113 | struct udev_list_entry *subsystem_include_list, | |
114 | struct udev_list_entry *subsystem_exclude_list, | |
115 | struct list_node *devices_list) | |
eb1f0e66 | 116 | { |
bc8184ed KS |
117 | if (subsystem_include_list != NULL) { |
118 | struct udev_list_entry *list_entry; | |
eb1f0e66 | 119 | |
bc8184ed | 120 | /* if list of subsystems to scan is given, just use this list */ |
b03e89cf KS |
121 | udev_list_entry_foreach(list_entry, subsystem_include_list) { |
122 | if (udev_list_entry_get_by_name(subsystem_exclude_list, udev_list_entry_get_name(list_entry)) != NULL) | |
123 | continue; | |
bc8184ed | 124 | devices_scan_subsystem(udev, basedir, udev_list_entry_get_name(list_entry), subdir, devices_list); |
b03e89cf | 125 | } |
bc8184ed KS |
126 | } else { |
127 | char path[UTIL_PATH_SIZE]; | |
128 | DIR *dir; | |
129 | struct dirent *dent; | |
130 | ||
131 | /* if no list of subsystems to scan is given, scan all, and possible exclude some subsystems */ | |
132 | util_strlcpy(path, udev_get_sys_path(udev), sizeof(path)); | |
133 | util_strlcat(path, basedir, sizeof(path)); | |
134 | dir = opendir(path); | |
135 | if (dir == NULL) | |
136 | return -1; | |
137 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
138 | if (dent->d_name[0] == '.') | |
139 | continue; | |
140 | if (udev_list_entry_get_by_name(subsystem_exclude_list, dent->d_name) != NULL) | |
141 | continue; | |
142 | devices_scan_subsystem(udev, basedir, dent->d_name, subdir, devices_list); | |
143 | } | |
144 | closedir(dir); | |
eb1f0e66 | 145 | } |
eb1f0e66 KS |
146 | return 0; |
147 | } | |
148 | ||
8753fadf | 149 | static int devices_delay(struct udev *udev, const char *syspath) |
eb1f0e66 KS |
150 | { |
151 | static const char *delay_device_list[] = { | |
152 | "/block/md", | |
153 | "/block/dm-", | |
154 | NULL | |
155 | }; | |
8753fadf | 156 | size_t len; |
eb1f0e66 KS |
157 | int i; |
158 | ||
8753fadf KS |
159 | len = strlen(udev_get_sys_path(udev)); |
160 | ||
eb1f0e66 | 161 | for (i = 0; delay_device_list[i] != NULL; i++) { |
8753fadf KS |
162 | if (strstr(&syspath[len], delay_device_list[i]) != NULL) { |
163 | info(udev, "delaying: %s\n", syspath); | |
eb1f0e66 KS |
164 | return 1; |
165 | } | |
166 | } | |
167 | return 0; | |
168 | } | |
169 | ||
6f67f1df KS |
170 | static struct udev_enumerate *enumerate_new(struct udev *udev) |
171 | { | |
172 | struct udev_enumerate *udev_enumerate; | |
173 | ||
174 | udev_enumerate = malloc(sizeof(struct udev_enumerate)); | |
175 | if (udev_enumerate == NULL) | |
176 | return NULL; | |
177 | memset(udev_enumerate, 0x00, (sizeof(struct udev_enumerate))); | |
178 | udev_enumerate->refcount = 1; | |
179 | udev_enumerate->udev = udev; | |
180 | list_init(&udev_enumerate->devices_list); | |
181 | return udev_enumerate; | |
182 | } | |
183 | ||
eb1f0e66 | 184 | /** |
bc8184ed | 185 | * udev_enumerate_new_from_devices: |
a076080b | 186 | * @udev: udev library context |
bc8184ed | 187 | * @subsystem: the list of names of subsystems to look for devices |
eb1f0e66 | 188 | * |
bf7ad0ea | 189 | * Returns: an enumeration context |
eb1f0e66 | 190 | **/ |
bc8184ed | 191 | struct udev_enumerate *udev_enumerate_new_from_devices(struct udev *udev, const char *subsystem, ...) |
eb1f0e66 | 192 | { |
bf7ad0ea | 193 | struct udev_enumerate *udev_enumerate; |
bc8184ed KS |
194 | va_list vargs; |
195 | const char *arg; | |
3eb46ec6 | 196 | char base[UTIL_PATH_SIZE]; |
eb1f0e66 | 197 | struct stat statbuf; |
bc8184ed KS |
198 | struct list_node subsystem_include_list; |
199 | struct list_node subsystem_exclude_list; | |
0de33a61 | 200 | struct udev_list_entry *list_entry; |
bf7ad0ea KS |
201 | |
202 | if (udev == NULL) | |
203 | return NULL; | |
eb1f0e66 | 204 | |
6f67f1df | 205 | udev_enumerate = enumerate_new(udev); |
bf7ad0ea KS |
206 | if (udev_enumerate == NULL) |
207 | return NULL; | |
eb1f0e66 | 208 | |
bc8184ed KS |
209 | va_start(vargs, subsystem); |
210 | list_init(&subsystem_include_list); | |
211 | list_init(&subsystem_exclude_list); | |
212 | for (arg = subsystem; arg != NULL; arg = va_arg(vargs, const char *)) { | |
213 | if (arg[0] != '!') | |
214 | list_entry_add(udev, &subsystem_include_list, arg, NULL, 1, 0); | |
215 | else | |
216 | list_entry_add(udev, &subsystem_exclude_list, &arg[1], NULL, 1, 0); | |
217 | } | |
218 | va_end(vargs); | |
219 | ||
3eb46ec6 KS |
220 | util_strlcpy(base, udev_get_sys_path(udev), sizeof(base)); |
221 | util_strlcat(base, "/subsystem", sizeof(base)); | |
eb1f0e66 | 222 | if (stat(base, &statbuf) == 0) { |
b03e89cf | 223 | /* we have /subsystem/, forget all the old stuff */ |
6f67f1df | 224 | info(udev, "searching '/subsystem/*/devices/*' dir\n"); |
bc8184ed KS |
225 | devices_scan_subsystems(udev, "/subsystem", "/devices", |
226 | list_get_entry(&subsystem_include_list), | |
227 | list_get_entry(&subsystem_exclude_list), | |
228 | &udev_enumerate->devices_list); | |
eb1f0e66 | 229 | } else { |
6f67f1df | 230 | info(udev, "searching '/bus/*/devices/*' dir\n"); |
bc8184ed KS |
231 | devices_scan_subsystems(udev, "/bus", "/devices", |
232 | list_get_entry(&subsystem_include_list), | |
233 | list_get_entry(&subsystem_exclude_list), | |
234 | &udev_enumerate->devices_list); | |
6f67f1df | 235 | info(udev, "searching '/class/*' dir\n"); |
bc8184ed KS |
236 | devices_scan_subsystems(udev, "/class", NULL, |
237 | list_get_entry(&subsystem_include_list), | |
238 | list_get_entry(&subsystem_exclude_list), | |
239 | &udev_enumerate->devices_list); | |
b03e89cf KS |
240 | /* if block isn't a class, scan /block/ */ |
241 | util_strlcpy(base, udev_get_sys_path(udev), sizeof(base)); | |
242 | util_strlcat(base, "/class/block", sizeof(base)); | |
243 | if (stat(base, &statbuf) != 0) { | |
244 | struct udev_list_entry *include_list = list_get_entry(&subsystem_include_list); | |
245 | struct udev_list_entry *exclude_list = list_get_entry(&subsystem_exclude_list); | |
246 | int include_block = (include_list == NULL || udev_list_entry_get_by_name(include_list, "block") != NULL); | |
247 | int exclude_block = (udev_list_entry_get_by_name(exclude_list, "block") != NULL); | |
248 | ||
249 | if (include_block && !exclude_block) { | |
250 | info(udev, "searching '/block/*/*' dir\n"); | |
251 | /* scan disks */ | |
252 | devices_scan_subsystem(udev, "/block", NULL, NULL, &udev_enumerate->devices_list); | |
253 | /* scan partitions */ | |
254 | devices_scan_subsystems(udev, "/block", NULL, | |
255 | NULL, NULL, | |
256 | &udev_enumerate->devices_list); | |
257 | } | |
258 | } | |
eb1f0e66 KS |
259 | } |
260 | ||
bc8184ed KS |
261 | list_cleanup(udev, &subsystem_include_list); |
262 | list_cleanup(udev, &subsystem_exclude_list); | |
263 | ||
bf7ad0ea | 264 | /* sort delayed devices to the end of the list */ |
0de33a61 KS |
265 | udev_list_entry_foreach(list_entry, list_get_entry(&udev_enumerate->devices_list)) { |
266 | if (devices_delay(udev, udev_list_entry_get_name(list_entry))) | |
267 | list_entry_move_to_end(list_entry); | |
eb1f0e66 | 268 | } |
bf7ad0ea | 269 | return udev_enumerate; |
eb1f0e66 | 270 | } |
bc8184ed KS |
271 | |
272 | struct udev_enumerate *udev_enumerate_new_from_subsystems(struct udev *udev) | |
273 | { | |
6f67f1df KS |
274 | struct udev_enumerate *udev_enumerate; |
275 | char base[UTIL_PATH_SIZE]; | |
276 | struct stat statbuf; | |
277 | const char *subsysdir; | |
278 | ||
279 | if (udev == NULL) | |
280 | return NULL; | |
281 | ||
282 | udev_enumerate = enumerate_new(udev); | |
283 | if (udev_enumerate == NULL) | |
284 | return NULL; | |
285 | ||
286 | util_strlcpy(base, udev_get_sys_path(udev), sizeof(base)); | |
287 | util_strlcat(base, "/subsystem", sizeof(base)); | |
288 | if (stat(base, &statbuf) == 0) | |
289 | subsysdir = "/subsystem"; | |
290 | else | |
291 | subsysdir = "/bus"; | |
292 | info(udev, "searching '%s/*' dir\n", subsysdir); | |
293 | devices_scan_subsystem(udev, subsysdir, NULL, NULL, &udev_enumerate->devices_list); | |
294 | info(udev, "searching '%s/*/drivers/*' dir\n", subsysdir); | |
295 | devices_scan_subsystems(udev, subsysdir, "/drivers", | |
296 | NULL, NULL, | |
297 | &udev_enumerate->devices_list); | |
298 | return udev_enumerate; | |
bc8184ed | 299 | } |