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>
38 #define strlcpy(d,s,l) (strncpy(d,s,l), (d)[(l)-1] = '\0')
42 #define strlcat(d,s,l) strncat(d,s,(l)-strlen(d)-1)
48 static void log_message(int priority, const char *format, ...)
52 va_start(args, format);
53 vsyslog(priority, format, args);
58 #define err(format, arg...) \
60 log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
64 #define info(format, arg...) \
66 log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
71 #define dbg(format, arg...) \
73 log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
76 #define dbg(...) do {} while(0)
80 static void trigger_uevent(const char *devpath)
82 char filename[PATH_SIZE];
85 strlcpy(filename, "/sys", sizeof(filename));
86 strlcat(filename, devpath, sizeof(filename));
87 strlcat(filename, "/uevent", sizeof(filename));
90 printf("%s\n", devpath);
95 fd = open(filename, O_WRONLY);
97 dbg("error on opening %s: %s\n", filename, strerror(errno));
101 if (write(fd, "add", 3) < 0)
102 info("error on triggering %s: %s\n", filename, strerror(errno));
107 static int sysfs_resolve_link(char *devpath, size_t size)
109 char link_path[PATH_SIZE];
110 char link_target[PATH_SIZE];
115 strlcpy(link_path, "/sys", sizeof(link_path));
116 strlcat(link_path, devpath, sizeof(link_path));
117 len = readlink(link_path, link_target, sizeof(link_target));
120 link_target[len] = '\0';
121 dbg("path link '%s' points to '%s'", devpath, link_target);
123 for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
125 dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
126 for (i = 0; i <= back; i++) {
127 char *pos = strrchr(devpath, '/');
133 dbg("after moving back '%s'", devpath);
134 strlcat(devpath, "/", size);
135 strlcat(devpath, &link_target[back * 3], size);
139 static bool device_has_attribute(const char *path, const char *attr,
142 char filename[PATH_SIZE];
145 strlcpy(filename, path, sizeof(filename));
146 strlcat(filename, attr, sizeof(filename));
148 if (stat(filename, &statbuf) < 0)
151 if (!(statbuf.st_mode & mode))
157 static int device_list_insert(const char *path)
159 char devpath[PATH_SIZE];
162 dbg("add '%s'" , path);
164 /* we only have a device, if we have an uevent file */
165 if (!device_has_attribute(path, "/uevent", S_IWUSR))
168 strlcpy(devpath, &path[4], sizeof(devpath));
170 /* resolve possible link to real target */
171 if (lstat(path, &statbuf) < 0)
173 if (S_ISLNK(statbuf.st_mode))
174 if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
177 trigger_uevent(devpath);
182 static void scan_subsystem(const char *subsys)
184 char base[PATH_SIZE];
188 strlcpy(base, "/sys/", sizeof(base));
189 strlcat(base, subsys, sizeof(base));
193 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
194 char dirname[PATH_SIZE];
196 struct dirent *dent2;
198 if (dent->d_name[0] == '.')
201 strlcpy(dirname, base, sizeof(dirname));
202 strlcat(dirname, "/", sizeof(dirname));
203 strlcat(dirname, dent->d_name, sizeof(dirname));
204 strlcat(dirname, "/devices", sizeof(dirname));
206 /* look for devices */
207 dir2 = opendir(dirname);
209 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
210 char dirname2[PATH_SIZE];
212 if (dent2->d_name[0] == '.')
215 strlcpy(dirname2, dirname, sizeof(dirname2));
216 strlcat(dirname2, "/", sizeof(dirname2));
217 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
218 device_list_insert(dirname2);
227 static void scan_block(void)
229 char base[PATH_SIZE];
233 strlcpy(base, "/sys/block", sizeof(base));
237 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
238 char dirname[PATH_SIZE];
240 struct dirent *dent2;
242 if (dent->d_name[0] == '.')
245 strlcpy(dirname, base, sizeof(dirname));
246 strlcat(dirname, "/", sizeof(dirname));
247 strlcat(dirname, dent->d_name, sizeof(dirname));
248 if (device_list_insert(dirname) != 0)
251 /* look for partitions */
252 dir2 = opendir(dirname);
254 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
255 char dirname2[PATH_SIZE];
257 if (dent2->d_name[0] == '.')
260 if (!strcmp(dent2->d_name,"device"))
263 strlcpy(dirname2, dirname, sizeof(dirname2));
264 strlcat(dirname2, "/", sizeof(dirname2));
265 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
266 device_list_insert(dirname2);
275 static void scan_class(void)
277 char base[PATH_SIZE];
281 strlcpy(base, "/sys/class", sizeof(base));
285 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
286 char dirname[PATH_SIZE];
288 struct dirent *dent2;
290 if (dent->d_name[0] == '.')
293 strlcpy(dirname, base, sizeof(dirname));
294 strlcat(dirname, "/", sizeof(dirname));
295 strlcat(dirname, dent->d_name, sizeof(dirname));
296 dir2 = opendir(dirname);
298 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
299 char dirname2[PATH_SIZE];
301 if (dent2->d_name[0] == '.')
304 if (!strcmp(dent2->d_name, "device"))
307 strlcpy(dirname2, dirname, sizeof(dirname2));
308 strlcat(dirname2, "/", sizeof(dirname2));
309 strlcat(dirname2, dent2->d_name, sizeof(dirname2));
310 device_list_insert(dirname2);
319 int main(int argc, char *argv[], char *envp[])
321 char base[PATH_SIZE];
325 openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
328 option = getopt(argc, argv, "vnh");
340 printf("Usage: udevtrigger OPTIONS\n"
341 " -v print the list of devices while running\n"
342 " -n do not actually trigger the events\n"
343 " -h print this text\n"
352 /* if we have /sys/subsystem, forget all the old stuff */
353 scan_subsystem("bus");
356 /* scan "block" if it isn't a "class" */
357 strlcpy(base, "/sys/class/block", sizeof(base));
358 if (stat(base, &statbuf) != 0)