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"
35 #include "udev_libc_wrapper.h"
37 #include "udev_utils.h"
38 #include "udev_sysfs.h"
39 #include "udev_version.h"
40 #include "udev_rules.h"
44 void log_message(int priority, const char *format, ...)
48 if (priority > udev_log_priority)
51 va_start(args, format);
52 vsyslog(priority, format, args);
57 /* Decide if we should manage the whole uevent, including multiplexing
58 * of the hotplug directories.
59 * For now look if the kernel calls udevsend instead of /sbin/hotplug,
60 * or the uevent-helper in /proc/sys/kernel/hotplug is empty.
62 static int manage_hotplug_event(void) {
67 /* don't handle hotplug.d if we are called directly */
68 if (!getenv("UDEVD_EVENT"))
71 fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
75 len = read(fd, helper, sizeof(helper)-1);
82 if (helper[0] == '\0' || helper[0] == '\n')
84 if (strstr(helper, "udevsend"))
90 static void asmlinkage sig_handler(int signum)
101 int main(int argc, char *argv[], char *envp[])
103 struct sysfs_class_device *class_dev;
104 struct sysfs_device *devices_dev;
106 char path[PATH_SIZE];
110 const char *subsystem;
112 struct sigaction act;
113 int retval = -EINVAL;
115 if (argc == 2 && strcmp(argv[1], "-V") == 0) {
116 printf("%s\n", UDEV_VERSION);
120 logging_init("udev");
122 dbg("version %s", UDEV_VERSION);
124 /* set signal handlers */
125 memset(&act, 0x00, sizeof(act));
126 act.sa_handler = (void (*)(int)) sig_handler;
127 sigemptyset (&act.sa_mask);
129 sigaction(SIGALRM, &act, NULL);
130 sigaction(SIGINT, &act, NULL);
131 sigaction(SIGTERM, &act, NULL);
133 /* trigger timeout to prevent hanging processes */
134 alarm(ALARM_TIMEOUT);
136 /* let the executed programs know if we handle the whole hotplug event */
137 managed_event = manage_hotplug_event();
139 setenv("MANAGED_EVENT", "1", 1);
141 action = getenv("ACTION");
142 devpath = getenv("DEVPATH");
143 subsystem = getenv("SUBSYSTEM");
144 /* older kernels passed the SUBSYSTEM only as argument */
145 if (!subsystem && argc == 2)
148 udev_init_device(&udev, devpath, subsystem, action);
150 if (!action || !subsystem || !devpath) {
151 err("action, subsystem or devpath missing");
155 /* export logging flag, as called scripts may want to do the same as udev */
156 if (udev_log_priority) {
159 sprintf(priority, "%i", udev_log_priority);
160 setenv("UDEV_LOG", priority, 1);
163 if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
166 if (strcmp(action, "add") == 0) {
167 /* wait for sysfs and possibly add node */
170 /* skip subsystems without "dev", but handle net devices */
171 if (udev.type != DEV_NET && subsystem_expect_no_dev(udev.subsystem)) {
172 dbg("don't care about '%s' devices", udev.subsystem);
176 snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath);
177 path[sizeof(path)-1] = '\0';
178 class_dev = wait_class_device_open(path);
179 if (class_dev == NULL) {
180 dbg("open class device failed");
183 dbg("opened class_dev->name='%s'", class_dev->name);
185 wait_for_class_device(class_dev, &error);
187 /* name, create node, store in db */
188 retval = udev_add_device(&udev, class_dev);
190 sysfs_close_class_device(class_dev);
191 } else if (strcmp(action, "remove") == 0) {
192 /* possibly remove a node */
195 /* skip subsystems without "dev" */
196 if (subsystem_expect_no_dev(udev.subsystem)) {
197 dbg("don't care about '%s' devices", udev.subsystem);
201 udev_rules_get_run(&udev);
202 if (udev.ignore_device) {
203 dbg("device event will be ignored");
207 /* get node from db, remove db-entry, delete created node */
208 retval = udev_remove_device(&udev);
211 if (udev.devname[0] != '\0')
212 setenv("DEVNAME", udev.devname, 1);
214 if (udev_run && !list_empty(&udev.run_list)) {
215 struct name_entry *name_loop;
217 dbg("executing run list");
218 list_for_each_entry(name_loop, &udev.run_list, node)
219 execute_command(name_loop->name, udev.subsystem);
222 /* run dev.d/ scripts if we created/deleted a node or changed a netif name */
223 if (udev_dev_d && udev.devname[0] != '\0')
224 udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
226 } else if (udev.type == DEV_DEVICE) {
227 if (strcmp(action, "add") == 0) {
231 snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
232 path[sizeof(path)-1] = '\0';
233 devices_dev = wait_devices_device_open(path);
235 dbg("devices device unavailable (probably remove has beaten us)");
238 dbg("devices device opened '%s'", path);
240 wait_for_devices_device(devices_dev, &error);
242 sysfs_close_device(devices_dev);
243 } else if (strcmp(action, "remove") == 0) {
244 dbg("devices remove");
251 if (udev_hotplug_d && managed_event)
252 udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
254 udev_cleanup_device(&udev);