2 * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
3 * Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
31 #include <sys/types.h>
37 #define strlcpy(d,s,l) (strncpy(d,s,l), (d)[(l)-1] = '\0')
41 #define strlcat(d,s,l) strncat(d,s,(l)-strlen(d)-1)
47 static void log_message(int priority, const char *format, ...)
51 va_start(args, format);
52 vsyslog(priority, format, args);
57 #define err(format, arg...) \
59 log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
63 #define info(format, arg...) \
65 log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
70 #define dbg(format, arg...) \
72 log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
75 #define dbg(...) do {} while(0)
79 static void trigger_uevent(const char *devpath)
81 char filename[PATH_SIZE];
84 strlcpy(filename, "/sys", sizeof(filename));
85 strlcat(filename, devpath, sizeof(filename));
86 strlcat(filename, "/uevent", sizeof(filename));
89 printf("%s\n", devpath);
94 fd = open(filename, O_WRONLY);
96 dbg("error on opening %s: %s\n", filename, strerror(errno));
100 if (write(fd, "add", 3) < 0)
101 info("error on triggering %s: %s\n", filename, strerror(errno));
106 static int sysfs_resolve_link(char *devpath, size_t size)
108 char link_path[PATH_SIZE];
109 char link_target[PATH_SIZE];
114 strlcpy(link_path, "/sys", sizeof(link_path));
115 strlcat(link_path, devpath, sizeof(link_path));
116 len = readlink(link_path, link_target, sizeof(link_target));
119 link_target[len] = '\0';
120 dbg("path link '%s' points to '%s'", devpath, link_target);
122 for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
124 dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
125 for (i = 0; i <= back; i++) {
126 char *pos = strrchr(devpath, '/');
132 dbg("after moving back '%s'", devpath);
133 strlcat(devpath, "/", size);
134 strlcat(devpath, &link_target[back * 3], size);
139 static int device_list_insert(const char *path)
141 char filename[PATH_SIZE];
142 char devpath[PATH_SIZE];
145 dbg("add '%s'" , path);
147 /* we only have a device, if we have an uevent file */
148 strlcpy(filename, path, sizeof(filename));
149 strlcat(filename, "/uevent", sizeof(filename));
150 if (stat(filename, &statbuf) < 0)
152 if (!(statbuf.st_mode & S_IWUSR))
155 strlcpy(devpath, &path[4], sizeof(devpath));
157 /* resolve possible link to real target */
158 if (lstat(path, &statbuf) < 0)
160 if (S_ISLNK(statbuf.st_mode))
161 if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
164 trigger_uevent(devpath);
169 static void scan_subsystem(const char *subsys)
171 char base[PATH_SIZE];
175 strlcpy(base, "/sys/", sizeof(base));
176 strlcat(base, subsys, sizeof(base));
180 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
181 char dirname[PATH_SIZE];
183 struct dirent *dent2;
185 if (dent->d_name[0] == '.')
188 strlcpy(dirname, base, sizeof(dirname));
189 strlcat(dirname, "/", sizeof(dirname));
190 strlcat(dirname, dent->d_name, sizeof(dirname));
191 strlcat(dirname, "/devices", sizeof(dirname));
193 /* look for devices */
194 dir2 = opendir(dirname);
196 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
197 char dirname2[PATH_SIZE];
199 if (dent2->d_name[0] == '.')
202 strlcpy(dirname2, dirname, sizeof(dirname2));
203 strlcat(dirname2, "/", sizeof(dirname2));
204 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
205 device_list_insert(dirname2);
214 static void scan_block(void)
216 char base[PATH_SIZE];
220 strlcpy(base, "/sys/block", sizeof(base));
224 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
225 char dirname[PATH_SIZE];
227 struct dirent *dent2;
229 if (dent->d_name[0] == '.')
232 strlcpy(dirname, base, sizeof(dirname));
233 strlcat(dirname, "/", sizeof(dirname));
234 strlcat(dirname, dent->d_name, sizeof(dirname));
235 if (device_list_insert(dirname) != 0)
238 /* look for partitions */
239 dir2 = opendir(dirname);
241 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
242 char dirname2[PATH_SIZE];
244 if (dent2->d_name[0] == '.')
247 if (!strcmp(dent2->d_name,"device"))
250 strlcpy(dirname2, dirname, sizeof(dirname2));
251 strlcat(dirname2, "/", sizeof(dirname2));
252 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
253 device_list_insert(dirname2);
262 static void scan_class(void)
264 char base[PATH_SIZE];
268 strlcpy(base, "/sys/class", sizeof(base));
272 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
273 char dirname[PATH_SIZE];
275 struct dirent *dent2;
277 if (dent->d_name[0] == '.')
280 strlcpy(dirname, base, sizeof(dirname));
281 strlcat(dirname, "/", sizeof(dirname));
282 strlcat(dirname, dent->d_name, sizeof(dirname));
283 dir2 = opendir(dirname);
285 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
286 char dirname2[PATH_SIZE];
288 if (dent2->d_name[0] == '.')
291 if (!strcmp(dent2->d_name, "device"))
294 strlcpy(dirname2, dirname, sizeof(dirname2));
295 strlcat(dirname2, "/", sizeof(dirname2));
296 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
297 device_list_insert(dirname2);
306 int main(int argc, char *argv[], char *envp[])
308 char base[PATH_SIZE];
312 openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
315 option = getopt(argc, argv, "vnh");
327 printf("Usage: udevtrigger OPTIONS\n"
328 " -v print the list of devices while running\n"
329 " -n do not actually trigger the events\n"
330 " -h print this text\n"
339 /* if we have /sys/subsystem, forget all the old stuff */
340 scan_subsystem("bus");
343 /* scan "block" if it isn't a "class" */
344 strlcpy(base, "/sys/class/block", sizeof(base));
345 if (stat(base, &statbuf) != 0)