4 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
5 * Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
7 * Quick and dirty way to populate a /dev with udev if your system
8 * does not have access to a shell. Based originally on a patch
10 * Harald Hoyer <harald@redhat.com>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation version 2 of the License.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 675 Mass Ave, Cambridge, MA 02139, USA.
39 #include <sys/types.h>
41 #include "libsysfs/sysfs/libsysfs.h"
42 #include "udev_libc_wrapper.h"
43 #include "udev_sysfs.h"
45 #include "udev_version.h"
47 #include "udev_utils.h"
48 #include "udev_rules.h"
51 static const char *udev_run_str;
52 static const char *udev_log_str;
53 static struct udev_rules rules;
56 void log_message(int priority, const char *format, ...)
60 if (priority > udev_log_priority)
63 va_start(args, format);
64 vsyslog(priority, format, args);
70 struct list_head node;
72 char subsys[NAME_SIZE];
75 /* sort files in lexical order */
76 static int device_list_insert(const char *path, char *subsystem, struct list_head *device_list)
78 struct device *loop_device;
79 struct device *new_device;
80 const char *devpath = &path[strlen(sysfs_path)];
82 dbg("insert: '%s'\n", devpath);
84 list_for_each_entry(loop_device, device_list, node) {
85 if (strcmp(loop_device->path, devpath) > 0) {
90 new_device = malloc(sizeof(struct device));
91 if (new_device == NULL) {
96 strlcpy(new_device->path, devpath, sizeof(new_device->path));
97 strlcpy(new_device->subsys, subsystem, sizeof(new_device->subsys));
98 list_add_tail(&new_device->node, &loop_device->node);
99 dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
103 /* list of devices that we should run last due to any one of a number of reasons */
104 static char *last_list[] = {
105 "/block/dm", /* on here because dm wants to have the block devices around before it */
109 /* list of devices that we should run first due to any one of a number of reasons */
110 static char *first_list[] = {
116 static int add_device(const char *devpath, const char *subsystem)
119 struct sysfs_class_device *class_dev;
120 char path[PATH_SIZE];
122 /* clear and set environment for next event */
124 setenv("ACTION", "add", 1);
125 setenv("DEVPATH", devpath, 1);
126 setenv("SUBSYSTEM", subsystem, 1);
127 setenv("UDEV_START", "1", 1);
129 setenv("UDEV_LOG", udev_log_str, 1);
131 setenv("UDEV_RUN", udev_run_str, 1);
132 dbg("add '%s'", devpath);
134 snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
135 path[sizeof(path)-1] = '\0';
136 class_dev = sysfs_open_class_device_path(path);
137 if (class_dev == NULL) {
138 dbg("sysfs_open_class_device_path failed");
142 udev_init_device(&udev, devpath, subsystem, "add");
143 udev.devt = get_devt(class_dev);
144 if (!udev.devt && udev.type != DEV_NET) {
145 dbg("sysfs_open_class_device_path failed");
148 udev_rules_get_name(&rules, &udev, class_dev);
149 if (udev.ignore_device) {
150 dbg("device event will be ignored");
153 if (udev.name[0] == '\0') {
154 dbg("device node creation supressed");
158 udev_add_device(&udev, class_dev);
159 if (udev.devname[0] != '\0')
160 setenv("DEVNAME", udev.devname, 1);
162 if (udev_run && !list_empty(&udev.run_list)) {
163 struct name_entry *name_loop;
165 dbg("executing run list");
166 list_for_each_entry(name_loop, &udev.run_list, node) {
167 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
168 pass_env_to_socket(&name_loop->name[strlen("socket:")], devpath, "add");
170 run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_DEBUG));
174 sysfs_close_class_device(class_dev);
175 udev_cleanup_device(&udev);
180 static void exec_list(struct list_head *device_list)
182 struct device *loop_device;
183 struct device *tmp_device;
186 /* handle the "first" type devices first */
187 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
188 for (i = 0; first_list[i] != NULL; i++) {
189 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
190 add_device(loop_device->path, loop_device->subsys);
191 list_del(&loop_device->node);
198 /* handle the devices we are allowed to, excluding the "last" type devices */
199 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
201 for (i = 0; last_list[i] != NULL; i++) {
202 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
210 add_device(loop_device->path, loop_device->subsys);
211 list_del(&loop_device->node);
215 /* handle the rest of the devices left over, if any */
216 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
217 add_device(loop_device->path, loop_device->subsys);
218 list_del(&loop_device->node);
223 static int has_devt(const char *path)
225 char filename[PATH_SIZE];
228 snprintf(filename, sizeof(filename), "%s/dev", path);
229 filename[sizeof(filename)-1] = '\0';
231 if (stat(filename, &statbuf) == 0)
237 static void udev_scan_block(struct list_head *device_list)
239 char base[PATH_SIZE];
243 snprintf(base, sizeof(base), "%s/block", sysfs_path);
244 base[sizeof(base)-1] = '\0';
248 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
249 char dirname[PATH_SIZE];
251 struct dirent *dent2;
253 if (dent->d_name[0] == '.')
256 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
257 dirname[sizeof(dirname)-1] = '\0';
258 if (has_devt(dirname))
259 device_list_insert(dirname, "block", device_list);
263 /* look for partitions */
264 dir2 = opendir(dirname);
266 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
267 char dirname2[PATH_SIZE];
269 if (dent2->d_name[0] == '.')
272 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
273 dirname2[sizeof(dirname2)-1] = '\0';
275 if (has_devt(dirname2))
276 device_list_insert(dirname2, "block", device_list);
285 static void udev_scan_class(struct list_head *device_list)
287 char base[PATH_SIZE];
291 snprintf(base, sizeof(base), "%s/class", sysfs_path);
292 base[sizeof(base)-1] = '\0';
296 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
297 char dirname[PATH_SIZE];
299 struct dirent *dent2;
301 if (dent->d_name[0] == '.')
304 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
305 dirname[sizeof(dirname)-1] = '\0';
307 dir2 = opendir(dirname);
309 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
310 char dirname2[PATH_SIZE];
312 if (dent2->d_name[0] == '.')
315 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
316 dirname2[sizeof(dirname2)-1] = '\0';
318 if (has_devt(dirname2) || strcmp(dent->d_name, "net") == 0)
319 device_list_insert(dirname2, dent->d_name, device_list);
328 static void asmlinkage sig_handler(int signum)
339 int main(int argc, char *argv[], char *envp[])
341 LIST_HEAD(device_list);
342 struct sigaction act;
344 logging_init("udevstart");
346 dbg("version %s", UDEV_VERSION);
348 udev_run_str = getenv("UDEV_RUN");
349 udev_log_str = getenv("UDEV_LOG");
351 /* disable all logging if not explicitely requested */
352 if (udev_log_str == NULL)
353 udev_log_priority = 0;
355 /* set signal handlers */
356 memset(&act, 0x00, sizeof(act));
357 act.sa_handler = (void (*) (int))sig_handler;
358 sigemptyset (&act.sa_mask);
360 sigaction(SIGALRM, &act, NULL);
361 sigaction(SIGINT, &act, NULL);
362 sigaction(SIGTERM, &act, NULL);
364 /* trigger timeout to prevent hanging processes */
365 alarm(UDEV_ALARM_TIMEOUT);
367 udev_rules_init(&rules, 0, 1);
369 udev_scan_class(&device_list);
370 udev_scan_block(&device_list);
371 exec_list(&device_list);
373 udev_rules_close(&rules);