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 a dev and an uevent file */
165 if (!device_has_attribute(path, "/dev", S_IRUSR) ||
166 !device_has_attribute(path, "/uevent", S_IWUSR))
169 strlcpy(devpath, &path[4], sizeof(devpath));
171 /* resolve possible link to real target */
172 if (lstat(path, &statbuf) < 0)
174 if (S_ISLNK(statbuf.st_mode))
175 if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
178 trigger_uevent(devpath);
182 static void scan_subdir(const char *base)
191 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
192 char dirname[PATH_SIZE];
194 strlcpy(dirname, base, sizeof(dirname));
195 strlcat(dirname, "/", sizeof(dirname));
196 strlcat(dirname, dent->d_name, sizeof(dirname));
197 device_list_insert(dirname);
203 static void scan_subsystem(const char *subsys)
205 char base[PATH_SIZE];
209 strlcpy(base, "/sys/", sizeof(base));
210 strlcat(base, subsys, sizeof(base));
216 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
217 char dirname[PATH_SIZE];
219 if (dent->d_name[0] == '.')
222 strlcpy(dirname, base, sizeof(dirname));
223 strlcat(dirname, "/", sizeof(dirname));
224 strlcat(dirname, dent->d_name, sizeof(dirname));
225 strlcat(dirname, "/devices", sizeof(dirname));
227 /* look for devices */
228 scan_subdir(dirname);
234 static void scan_block(void)
236 char base[PATH_SIZE];
240 strlcpy(base, "/sys/block", sizeof(base));
246 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
247 char dirname[PATH_SIZE];
249 if (dent->d_name[0] == '.')
252 strlcpy(dirname, base, sizeof(dirname));
253 strlcat(dirname, "/", sizeof(dirname));
254 strlcat(dirname, dent->d_name, sizeof(dirname));
255 if (device_list_insert(dirname) != 0)
258 /* look for partitions */
259 scan_subdir(dirname);
265 static void scan_class(void)
267 char base[PATH_SIZE];
271 strlcpy(base, "/sys/class", sizeof(base));
277 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
278 char dirname[PATH_SIZE];
280 if (dent->d_name[0] == '.')
283 strlcpy(dirname, base, sizeof(dirname));
284 strlcat(dirname, "/", sizeof(dirname));
285 strlcat(dirname, dent->d_name, sizeof(dirname));
287 scan_subdir(dirname);
293 int main(int argc, char *argv[], char *envp[])
295 char base[PATH_SIZE];
299 openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
302 option = getopt(argc, argv, "vnh");
314 printf("Usage: udevtrigger OPTIONS\n"
315 " -v print the list of devices while running\n"
316 " -n do not actually trigger the events\n"
317 " -h print this text\n"
326 /* if we have /sys/subsystem, forget all the old stuff */
327 scan_subsystem("bus");
330 /* scan "block" if it isn't a "class" */
331 strlcpy(base, "/sys/class/block", sizeof(base));
332 if (stat(base, &statbuf) != 0)