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1 | /* |
2 | * udevtrigger.c | |
3 | * | |
4 | * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org> | |
5 | * Copyright (C) 2006 Hannes Reinecke <hare@suse.de> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation version 2 of the License. | |
10 | * | |
11 | * This program 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 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stddef.h> | |
24 | #include <string.h> | |
25 | #include <stdio.h> | |
26 | #include <unistd.h> | |
27 | #include <errno.h> | |
28 | #include <dirent.h> | |
29 | #include <fcntl.h> | |
30 | #include <syslog.h> | |
31 | #include <sys/stat.h> | |
32 | #include <sys/types.h> | |
33 | ||
34 | #include "udev.h" | |
35 | ||
36 | static const char *udev_log_str; | |
37 | static int verbose; | |
38 | static int dry_run; | |
39 | ||
40 | #ifdef USE_LOG | |
41 | void log_message(int priority, const char *format, ...) | |
42 | { | |
43 | va_list args; | |
44 | ||
45 | if (priority > udev_log_priority) | |
46 | return; | |
47 | ||
48 | va_start(args, format); | |
49 | vsyslog(priority, format, args); | |
50 | va_end(args); | |
51 | } | |
52 | #endif | |
53 | ||
54 | /* list of devices that we should run last due to any one of a number of reasons */ | |
55 | static char *last_list[] = { | |
56 | "/class/block/md", | |
57 | "/class/block/dm-", | |
58 | "/block/md", | |
59 | "/block/dm-", | |
60 | NULL | |
61 | }; | |
62 | ||
63 | /* list of devices that we should run first due to any one of a number of reasons */ | |
64 | static char *first_list[] = { | |
65 | "/class/mem", | |
66 | "/class/tty", | |
67 | NULL | |
68 | }; | |
69 | ||
70 | LIST_HEAD(device_first_list); | |
71 | LIST_HEAD(device_default_list); | |
72 | LIST_HEAD(device_last_list); | |
73 | ||
74 | static int device_list_insert(const char *path) | |
75 | { | |
76 | struct list_head *device_list = &device_default_list; | |
77 | int i; | |
78 | ||
79 | for (i = 0; first_list[i] != NULL; i++) { | |
80 | if (strncmp(path, first_list[i], strlen(first_list[i])) == 0) { | |
81 | device_list = &device_first_list; | |
82 | break; | |
83 | } | |
84 | } | |
85 | for (i = 0; last_list[i] != NULL; i++) { | |
86 | if (strncmp(path, last_list[i], strlen(last_list[i])) == 0) { | |
87 | device_list = &device_last_list; | |
88 | break; | |
89 | } | |
90 | } | |
91 | ||
92 | dbg("add '%s'" , path); | |
93 | /* double entries will be ignored */ | |
94 | name_list_add(device_list, path, 0); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static void trigger_uevent(const char *path) | |
99 | { | |
100 | char filename[PATH_SIZE]; | |
101 | int fd; | |
102 | ||
103 | strlcpy(filename, path, sizeof(filename)); | |
104 | strlcat(filename, "/uevent", sizeof(filename)); | |
105 | ||
106 | if (verbose) | |
107 | printf("%s\n", path); | |
108 | ||
109 | if (dry_run) | |
110 | return; | |
111 | ||
112 | fd = open(filename, O_WRONLY); | |
113 | if (fd < 0) { | |
114 | dbg("error on opening %s: %s\n", filename, strerror(errno)); | |
115 | return; | |
116 | } | |
117 | ||
118 | if (write(fd, "add", 3) < 0) | |
119 | info("error on triggering %s: %s\n", filename, strerror(errno)); | |
120 | ||
121 | close(fd); | |
122 | } | |
123 | ||
124 | static void exec_lists(void) | |
125 | { | |
126 | struct name_entry *loop_device; | |
127 | struct name_entry *tmp_device; | |
128 | ||
129 | /* handle the devices on the "first" list first */ | |
130 | list_for_each_entry_safe(loop_device, tmp_device, &device_first_list, node) { | |
131 | trigger_uevent(loop_device->name); | |
132 | list_del(&loop_device->node); | |
133 | free(loop_device); | |
134 | } | |
135 | ||
136 | /* handle the devices on the "default" list next */ | |
137 | list_for_each_entry_safe(loop_device, tmp_device, &device_default_list, node) { | |
138 | trigger_uevent(loop_device->name); | |
139 | list_del(&loop_device->node); | |
140 | free(loop_device); | |
141 | } | |
142 | ||
143 | /* handle devices on the "last" list, if any */ | |
144 | list_for_each_entry_safe(loop_device, tmp_device, &device_last_list, node) { | |
145 | trigger_uevent(loop_device->name); | |
146 | list_del(&loop_device->node); | |
147 | free(loop_device); | |
148 | } | |
149 | } | |
150 | ||
151 | static int is_device(const char *path) | |
152 | { | |
153 | char filename[PATH_SIZE]; | |
154 | struct stat statbuf; | |
155 | ||
156 | /* look for the uevent file of the kobject */ | |
157 | strlcpy(filename, path, sizeof(filename)); | |
158 | strlcat(filename, "/uevent", sizeof(filename)); | |
159 | if (stat(filename, &statbuf) < 0) | |
160 | return 0; | |
161 | ||
162 | if (!(statbuf.st_mode & S_IWUSR)) | |
163 | return 0; | |
164 | ||
165 | return 1; | |
166 | } | |
167 | ||
168 | static void udev_scan_bus(void) | |
169 | { | |
170 | char base[PATH_SIZE]; | |
171 | DIR *dir; | |
172 | struct dirent *dent; | |
173 | ||
174 | strlcpy(base, sysfs_path, sizeof(base)); | |
175 | strlcat(base, "/bus", sizeof(base)); | |
176 | ||
177 | dir = opendir(base); | |
178 | if (dir != NULL) { | |
179 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
180 | char dirname[PATH_SIZE]; | |
181 | DIR *dir2; | |
182 | struct dirent *dent2; | |
183 | ||
184 | if (dent->d_name[0] == '.') | |
185 | continue; | |
186 | ||
187 | strlcpy(dirname, base, sizeof(dirname)); | |
188 | strlcat(dirname, "/", sizeof(dirname)); | |
189 | strlcat(dirname, dent->d_name, sizeof(dirname)); | |
190 | strlcat(dirname, "/devices", sizeof(dirname)); | |
191 | ||
192 | /* look for devices */ | |
193 | dir2 = opendir(dirname); | |
194 | if (dir2 != NULL) { | |
195 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { | |
196 | char dirname2[PATH_SIZE]; | |
197 | ||
198 | if (dent2->d_name[0] == '.') | |
199 | continue; | |
200 | ||
201 | strlcpy(dirname2, dirname, sizeof(dirname2)); | |
202 | strlcat(dirname2, "/", sizeof(dirname2)); | |
203 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); | |
204 | ||
205 | if (is_device(dirname2)) | |
206 | device_list_insert(dirname2); | |
207 | } | |
208 | closedir(dir2); | |
209 | } | |
210 | } | |
211 | closedir(dir); | |
212 | } | |
213 | } | |
214 | ||
215 | static void udev_scan_block(void) | |
216 | { | |
217 | char base[PATH_SIZE]; | |
218 | DIR *dir; | |
219 | struct dirent *dent; | |
220 | struct stat statbuf; | |
221 | ||
222 | /* skip if "block" is already a "class" */ | |
223 | strlcpy(base, sysfs_path, sizeof(base)); | |
224 | strlcat(base, "/class/block", sizeof(base)); | |
225 | if (stat(base, &statbuf) == 0) | |
226 | return; | |
227 | ||
228 | strlcpy(base, sysfs_path, sizeof(base)); | |
229 | strlcat(base, "/block", sizeof(base)); | |
230 | ||
231 | dir = opendir(base); | |
232 | if (dir != NULL) { | |
233 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
234 | char dirname[PATH_SIZE]; | |
235 | DIR *dir2; | |
236 | struct dirent *dent2; | |
237 | ||
238 | if (dent->d_name[0] == '.') | |
239 | continue; | |
240 | ||
241 | strlcpy(dirname, base, sizeof(dirname)); | |
242 | strlcat(dirname, "/", sizeof(dirname)); | |
243 | strlcat(dirname, dent->d_name, sizeof(dirname)); | |
244 | if (is_device(dirname)) | |
245 | device_list_insert(dirname); | |
246 | else | |
247 | continue; | |
248 | ||
249 | /* look for partitions */ | |
250 | dir2 = opendir(dirname); | |
251 | if (dir2 != NULL) { | |
252 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { | |
253 | char dirname2[PATH_SIZE]; | |
254 | ||
255 | if (dent2->d_name[0] == '.') | |
256 | continue; | |
257 | ||
258 | if (!strcmp(dent2->d_name,"device")) | |
259 | continue; | |
260 | ||
261 | strlcpy(dirname2, dirname, sizeof(dirname2)); | |
262 | strlcat(dirname2, "/", sizeof(dirname2)); | |
263 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); | |
264 | if (is_device(dirname2)) | |
265 | device_list_insert(dirname2); | |
266 | } | |
267 | closedir(dir2); | |
268 | } | |
269 | } | |
270 | closedir(dir); | |
271 | } | |
272 | } | |
273 | ||
274 | static void udev_scan_class(void) | |
275 | { | |
276 | char base[PATH_SIZE]; | |
277 | DIR *dir; | |
278 | struct dirent *dent; | |
279 | ||
280 | strlcpy(base, sysfs_path, sizeof(base)); | |
281 | strlcat(base, "/class", sizeof(base)); | |
282 | ||
283 | dir = opendir(base); | |
284 | if (dir != NULL) { | |
285 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
286 | char dirname[PATH_SIZE]; | |
287 | DIR *dir2; | |
288 | struct dirent *dent2; | |
289 | ||
290 | if (dent->d_name[0] == '.') | |
291 | continue; | |
292 | ||
293 | strlcpy(dirname, base, sizeof(dirname)); | |
294 | strlcat(dirname, "/", sizeof(dirname)); | |
295 | strlcat(dirname, dent->d_name, sizeof(dirname)); | |
296 | dir2 = opendir(dirname); | |
297 | if (dir2 != NULL) { | |
298 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { | |
299 | char dirname2[PATH_SIZE]; | |
300 | ||
301 | if (dent2->d_name[0] == '.') | |
302 | continue; | |
303 | ||
304 | if (!strcmp(dent2->d_name, "device")) | |
305 | continue; | |
306 | ||
307 | strlcpy(dirname2, dirname, sizeof(dirname2)); | |
308 | strlcat(dirname2, "/", sizeof(dirname2)); | |
309 | strlcat(dirname2, dent2->d_name, sizeof(dirname2)); | |
310 | if (is_device(dirname2)) | |
311 | device_list_insert(dirname2); | |
312 | } | |
313 | closedir(dir2); | |
314 | } | |
315 | } | |
316 | closedir(dir); | |
317 | } | |
318 | } | |
319 | ||
320 | int main(int argc, char *argv[], char *envp[]) | |
321 | { | |
322 | int i; | |
323 | ||
324 | logging_init("udevtrigger"); | |
325 | udev_config_init(); | |
326 | dbg("version %s", UDEV_VERSION); | |
327 | ||
328 | udev_log_str = getenv("UDEV_LOG"); | |
329 | ||
330 | for (i = 1 ; i < argc; i++) { | |
331 | char *arg = argv[i]; | |
332 | ||
333 | if (strcmp(arg, "--verbose") == 0 || strcmp(arg, "-v") == 0) | |
334 | verbose = 1; | |
335 | else if (strcmp(arg, "--dry-run") == 0 || strcmp(arg, "-n") == 0) | |
336 | dry_run = 1; | |
337 | else { | |
338 | fprintf(stderr, "Usage: udevtrigger [--verbose] [--dry-run]\n"); | |
339 | goto exit; | |
340 | } | |
341 | } | |
342 | ||
343 | sysfs_init(); | |
344 | ||
345 | udev_scan_bus(); | |
346 | udev_scan_class(); | |
347 | udev_scan_block(); | |
348 | exec_lists(); | |
349 | ||
350 | sysfs_cleanup(); | |
351 | exit: | |
352 | logging_close(); | |
353 | return 0; | |
354 | } |