6 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
34 #include "libsysfs/sysfs/libsysfs.h"
36 #include "udev_utils.h"
37 #include "udev_sysfs.h"
38 #include "udev_version.h"
44 void log_message(int level, const char *format, ...)
51 va_start(args, format);
52 vsyslog(level, format, args);
57 /* decide if we should manage the whole hotplug event
58 * for now look if the kernel calls udevsend instead of /sbin/hotplug
60 static int manage_hotplug_event(void) {
65 /* don't handle hotplug.d if we are called directly */
66 if (!getenv("UDEVD_EVENT"))
69 fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
73 len = read(fd, helper, 256);
80 if (strstr(helper, "udevsend"))
86 static void asmlinkage sig_handler(int signum)
97 int main(int argc, char *argv[], char *envp[])
100 struct sysfs_class_device *class_dev;
101 struct sysfs_device *devices_dev;
103 char path[SYSFS_PATH_MAX];
107 const char *subsystem;
109 int retval = -EINVAL;
111 if (argc == 2 && strcmp(argv[1], "-V") == 0) {
112 printf("%s\n", UDEV_VERSION);
116 logging_init("udev");
117 dbg("version %s", UDEV_VERSION);
121 /* set signal handlers */
122 memset(&act, 0x00, sizeof(act));
123 act.sa_handler = (void (*) (int))sig_handler;
124 sigemptyset (&act.sa_mask);
126 sigaction(SIGALRM, &act, NULL);
127 sigaction(SIGINT, &act, NULL);
128 sigaction(SIGTERM, &act, NULL);
130 /* trigger timeout to prevent hanging processes */
131 alarm(ALARM_TIMEOUT);
133 if (strstr(argv[0], "udevstart") || (argc == 2 && strstr(argv[1], "udevstart"))) {
136 /* disable all logging, as it's much too slow on some facilities */
140 retval = udev_start();
144 /* let the executed programs know if we handle the whole hotplug event */
145 managed_event = manage_hotplug_event();
147 setenv("MANAGED_EVENT", "1", 1);
149 action = getenv("ACTION");
150 devpath = getenv("DEVPATH");
151 subsystem = getenv("SUBSYSTEM");
152 /* older kernels passed the SUBSYSTEM only as argument */
153 if (!subsystem && argc == 2)
169 /* export logging flag, as called scripts may want to do the same as udev */
171 setenv("UDEV_LOG", "1", 1);
173 udev_init_device(&udev, devpath, subsystem);
175 if (udev.type == BLOCK || udev.type == CLASS || udev.type == NET) {
176 if (strcmp(action, "add") == 0) {
177 /* wait for sysfs and possibly add node */
180 /* skip subsystems without "dev", but handle net devices */
181 if (udev.type != NET && subsystem_expect_no_dev(udev.subsystem)) {
182 dbg("don't care about '%s' devices", udev.subsystem);
186 snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
187 class_dev = wait_class_device_open(path);
188 if (class_dev == NULL) {
189 dbg ("open class device failed");
192 dbg("opened class_dev->name='%s'", class_dev->name);
194 wait_for_class_device(class_dev, &error);
199 /* name, create node, store in db */
200 retval = udev_add_device(&udev, class_dev);
202 sysfs_close_class_device(class_dev);
203 } else if (strcmp(action, "remove") == 0) {
204 /* possibly remove a node */
207 /* skip subsystems without "dev" */
208 if (subsystem_expect_no_dev(udev.subsystem)) {
209 dbg("don't care about '%s' devices", udev.subsystem);
213 /* get node from db, remove db-entry, delete created node */
214 retval = udev_remove_device(&udev);
217 /* run dev.d/ scripts if we created/deleted a node or changed a netif name */
218 if (udev.devname[0] != '\0') {
219 setenv("DEVNAME", udev.devname, 1);
221 udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
223 } else if (udev.type == PHYSDEV) {
224 if (strcmp(action, "add") == 0) {
228 snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath);
229 devices_dev = wait_devices_device_open(path);
231 dbg("devices device unavailable (probably remove has beaten us)");
234 dbg("devices device opened '%s'", path);
236 wait_for_devices_device(devices_dev, &error);
238 sysfs_close_device(devices_dev);
239 } else if (strcmp(action, "remove") == 0) {
240 dbg("devices remove");
247 if (udev_hotplug_d && managed_event)
248 udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);