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.
32 #include <sys/types.h>
39 void log_message(int priority, const char *format, ...)
43 va_start(args, format);
44 vsyslog(priority, format, args);
49 #define err(format, arg...) \
51 log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
55 #define info(format, arg...) \
57 log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
62 #define dbg(format, arg...) \
64 log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
67 #define dbg(...) do {} while(0)
71 static void trigger_uevent(const char *devpath)
73 char filename[PATH_SIZE];
76 strlcpy(filename, "/sys", sizeof(filename));
77 strlcat(filename, devpath, sizeof(filename));
78 strlcat(filename, "/uevent", sizeof(filename));
81 printf("%s\n", devpath);
86 fd = open(filename, O_WRONLY);
88 dbg("error on opening %s: %s\n", filename, strerror(errno));
92 if (write(fd, "add", 3) < 0)
93 info("error on triggering %s: %s\n", filename, strerror(errno));
98 static int sysfs_resolve_link(char *devpath, size_t size)
100 char link_path[PATH_SIZE];
101 char link_target[PATH_SIZE];
106 strlcpy(link_path, "/sys", sizeof(link_path));
107 strlcat(link_path, devpath, sizeof(link_path));
108 len = readlink(link_path, link_target, sizeof(link_target));
111 link_target[len] = '\0';
112 dbg("path link '%s' points to '%s'", devpath, link_target);
114 for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
116 dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
117 for (i = 0; i <= back; i++) {
118 char *pos = strrchr(devpath, '/');
124 dbg("after moving back '%s'", devpath);
125 strlcat(devpath, "/", size);
126 strlcat(devpath, &link_target[back * 3], size);
131 static int device_list_insert(const char *path)
133 char filename[PATH_SIZE];
134 char devpath[PATH_SIZE];
137 dbg("add '%s'" , path);
139 /* we only have a device, if we have an uevent file */
140 strlcpy(filename, path, sizeof(filename));
141 strlcat(filename, "/uevent", sizeof(filename));
142 if (stat(filename, &statbuf) < 0)
144 if (!(statbuf.st_mode & S_IWUSR))
147 strlcpy(devpath, &path[4], sizeof(devpath));
149 /* resolve possible link to real target */
150 if (lstat(path, &statbuf) < 0)
152 if (S_ISLNK(statbuf.st_mode))
153 if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
156 trigger_uevent(devpath);
161 static void scan_subsystem(const char *subsys)
163 char base[PATH_SIZE];
167 strlcpy(base, "/sys/", sizeof(base));
168 strlcat(base, subsys, sizeof(base));
172 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
173 char dirname[PATH_SIZE];
175 struct dirent *dent2;
177 if (dent->d_name[0] == '.')
180 strlcpy(dirname, base, sizeof(dirname));
181 strlcat(dirname, "/", sizeof(dirname));
182 strlcat(dirname, dent->d_name, sizeof(dirname));
183 strlcat(dirname, "/devices", sizeof(dirname));
185 /* look for devices */
186 dir2 = opendir(dirname);
188 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
189 char dirname2[PATH_SIZE];
191 if (dent2->d_name[0] == '.')
194 strlcpy(dirname2, dirname, sizeof(dirname2));
195 strlcat(dirname2, "/", sizeof(dirname2));
196 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
197 device_list_insert(dirname2);
206 static void scan_block(void)
208 char base[PATH_SIZE];
212 strlcpy(base, "/sys/block", sizeof(base));
216 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
217 char dirname[PATH_SIZE];
219 struct dirent *dent2;
221 if (dent->d_name[0] == '.')
224 strlcpy(dirname, base, sizeof(dirname));
225 strlcat(dirname, "/", sizeof(dirname));
226 strlcat(dirname, dent->d_name, sizeof(dirname));
227 if (device_list_insert(dirname) != 0)
230 /* look for partitions */
231 dir2 = opendir(dirname);
233 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
234 char dirname2[PATH_SIZE];
236 if (dent2->d_name[0] == '.')
239 if (!strcmp(dent2->d_name,"device"))
242 strlcpy(dirname2, dirname, sizeof(dirname2));
243 strlcat(dirname2, "/", sizeof(dirname2));
244 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
245 device_list_insert(dirname2);
254 static void scan_class(void)
256 char base[PATH_SIZE];
260 strlcpy(base, "/sys/class", sizeof(base));
264 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
265 char dirname[PATH_SIZE];
267 struct dirent *dent2;
269 if (dent->d_name[0] == '.')
272 strlcpy(dirname, base, sizeof(dirname));
273 strlcat(dirname, "/", sizeof(dirname));
274 strlcat(dirname, dent->d_name, sizeof(dirname));
275 dir2 = opendir(dirname);
277 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
278 char dirname2[PATH_SIZE];
280 if (dent2->d_name[0] == '.')
283 if (!strcmp(dent2->d_name, "device"))
286 strlcpy(dirname2, dirname, sizeof(dirname2));
287 strlcat(dirname2, "/", sizeof(dirname2));
288 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
289 device_list_insert(dirname2);
298 int main(int argc, char *argv[], char *envp[])
300 char base[PATH_SIZE];
305 openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
308 option = getopt(argc, argv, "vnh");
320 printf("Usage: udevtrigger OPTIONS\n"
321 " -v print the list of devices while running\n"
322 " -n do not actually trigger the events\n"
323 " -h print this text\n"
332 /* if we have /sys/subsystem, forget all the old stuff */
333 scan_subsystem("bus");
336 /* scan "block" if it isn't a "class" */
337 strlcpy(base, "/sys/class/block", sizeof(base));
338 if (stat(base, &statbuf) != 0)