6 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation version 2 of the License.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
33 #include "libsysfs/sysfs/libsysfs.h"
36 #include "udev_version.h"
41 /* timeout flag for udevdb */
42 extern sig_atomic_t gotalarm;
44 /* global variables */
49 unsigned char logname[LOGNAME_SIZE];
50 void log_message(int level, const char *format, ...)
57 va_start(args, format);
58 vsyslog(level, format, args);
63 static void asmlinkage sig_handler(int signum)
68 info("error: timeout reached, event probably not handled correctly");
75 dbg("unhandled signal %d", signum);
79 /* list of subsystems we don't care about. not listing such systems here
80 * is not critical, but it makes it faster as we don't look for the "dev" file
82 static int subsystem_without_dev(const char *subsystem)
84 char *subsystem_blacklist[] = {
100 for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
101 if (strcmp(subsystem, *subsys) == 0)
108 int main(int argc, char *argv[], char *envp[])
110 struct sigaction act;
111 struct sysfs_class_device *class_dev;
113 char path[SYSFS_PATH_MAX];
114 int retval = -EINVAL;
121 dbg("version %s", UDEV_VERSION);
126 logging_init("udev");
130 if (strstr(argv[0], "udevstart")) {
131 act_type = UDEVSTART;
133 const char *action = get_action();
134 const char *devpath = get_devpath();
135 const char *subsystem = get_subsystem(main_argv[1]);
141 if (strcmp(action, "add") == 0) {
143 } else if (strcmp(action, "remove") == 0) {
146 dbg("no action '%s' for us", action);
154 dbg("looking at '%s'", udev.devpath);
156 /* we only care about class devices and block stuff */
157 if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
158 dbg("not a block or class device");
167 /* skip blacklisted subsystems */
168 if (subsystem_without_dev(subsystem)) {
169 dbg("don't care about '%s' devices", subsystem);
173 udev_set_values(&udev, devpath, subsystem);
176 /* set signal handlers */
177 act.sa_handler = (void (*) (int))sig_handler;
178 sigemptyset (&act.sa_mask);
179 /* alarm must not restart syscalls*/
180 sigaction(SIGALRM, &act, NULL);
181 sigaction(SIGINT, &act, NULL);
182 sigaction(SIGTERM, &act, NULL);
184 /* trigger timout to interrupt blocking syscalls */
185 alarm(ALARM_TIMEOUT);
187 /* initialize udev database */
188 if (udevdb_init(UDEVDB_DEFAULT) != 0)
189 info("error: unable to initialize database, continuing without database");
195 retval = udev_start();
203 /* open the device */
204 snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
205 class_dev = sysfs_open_class_device_path(path);
206 if (class_dev == NULL) {
207 dbg ("sysfs_open_class_device_path failed");
210 dbg("opened class_dev->name='%s'", class_dev->name);
212 /* name, create node, store in db */
213 retval = udev_add_device(&udev, class_dev);
216 dev_d_execute(&udev);
218 sysfs_close_class_device(class_dev);
223 /* get node from db, delete it*/
224 retval = udev_remove_device(&udev);
227 dev_d_execute(&udev);