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
32 #include "libsysfs/sysfs/libsysfs.h"
35 #include "udev_version.h"
40 /* timeout flag for udevdb */
41 extern sig_atomic_t gotalarm;
43 /* global variables */
48 unsigned char logname[LOGNAME_SIZE];
49 void log_message(int level, const char *format, ...)
56 va_start(args, format);
57 vsyslog(level, format, args);
62 static void asmlinkage sig_handler(int signum)
67 info("error: timeout reached, event probably not handled correctly");
74 dbg("unhandled signal %d", signum);
78 /* list of subsystems we don't care about. not listing such systems here
79 * is not critical, but it makes it faster as we don't look for the "dev" file
81 static int subsystem_without_dev(const char *subsystem)
83 char *subsystem_blacklist[] = {
99 for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
100 if (strcmp(subsystem, *subsys) == 0)
107 int main(int argc, char *argv[], char *envp[])
109 struct sigaction act;
110 struct sysfs_class_device *class_dev;
112 char path[SYSFS_PATH_MAX];
113 int retval = -EINVAL;
120 dbg("version %s", UDEV_VERSION);
125 logging_init("udev");
129 if (strstr(argv[0], "udevstart")) {
130 act_type = UDEVSTART;
132 const char *action = get_action();
133 const char *devpath = get_devpath();
134 const char *subsystem = get_subsystem(main_argv[1]);
140 if (strcmp(action, "add") == 0) {
142 } else if (strcmp(action, "remove") == 0) {
145 dbg("no action '%s' for us", action);
153 dbg("looking at '%s'", udev.devpath);
155 /* we only care about class devices and block stuff */
156 if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
157 dbg("not a block or class device");
166 /* skip blacklisted subsystems */
167 if (subsystem_without_dev(subsystem)) {
168 dbg("don't care about '%s' devices", subsystem);
172 udev_set_values(&udev, devpath, subsystem);
175 /* set signal handlers */
176 act.sa_handler = (void (*) (int))sig_handler;
177 sigemptyset (&act.sa_mask);
178 /* alarm must not restart syscalls*/
179 sigaction(SIGALRM, &act, NULL);
180 sigaction(SIGINT, &act, NULL);
181 sigaction(SIGTERM, &act, NULL);
183 /* trigger timout to interrupt blocking syscalls */
184 alarm(ALARM_TIMEOUT);
186 /* initialize udev database */
187 if (udevdb_init(UDEVDB_DEFAULT) != 0)
188 info("error: unable to initialize database, continuing without database");
194 retval = udev_start();
202 /* open the device */
203 snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
204 class_dev = sysfs_open_class_device_path(path);
205 if (class_dev == NULL) {
206 dbg ("sysfs_open_class_device_path failed");
209 dbg("opened class_dev->name='%s'", class_dev->name);
211 /* name, create node, store in db */
212 retval = udev_add_device(&udev, class_dev);
216 retval = udev_remove_device(&udev);