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>
42 #include "udev_rules.h"
44 static const char *udev_run_str;
45 static const char *udev_log_str;
46 static struct udev_rules rules;
49 void log_message(int priority, const char *format, ...)
53 if (priority > udev_log_priority)
56 va_start(args, format);
57 vsyslog(priority, format, args);
63 struct list_head node;
67 /* sort files in lexical order */
68 static int device_list_insert(const char *path, struct list_head *device_list)
70 struct device *loop_device;
71 struct device *new_device;
72 const char *devpath = &path[strlen(sysfs_path)];
74 dbg("insert: '%s'\n", devpath);
76 list_for_each_entry(loop_device, device_list, node) {
77 if (strcmp(loop_device->path, devpath) > 0) {
82 new_device = malloc(sizeof(struct device));
83 if (new_device == NULL) {
88 strlcpy(new_device->path, devpath, sizeof(new_device->path));
89 list_add_tail(&new_device->node, &loop_device->node);
90 dbg("add '%s'" , new_device->path);
94 /* list of devices that we should run last due to any one of a number of reasons */
95 static char *last_list[] = {
96 "/block/dm", /* on here because dm wants to have the block devices around before it */
100 /* list of devices that we should run first due to any one of a number of reasons */
101 static char *first_list[] = {
107 static int add_device(const char *devpath)
109 struct sysfs_device *dev;
110 struct udevice *udev;
112 /* clear and set environment for next event */
114 setenv("ACTION", "add", 1);
115 setenv("UDEV_START", "1", 1);
117 setenv("UDEV_LOG", udev_log_str, 1);
119 setenv("UDEV_RUN", udev_run_str, 1);
121 dev = sysfs_device_get(devpath);
125 udev = udev_device_init();
129 /* override built-in sysfs device */
131 strcpy(udev->action, "add");
132 udev->devt = udev_device_get_devt(udev);
134 if (strcmp(udev->dev->subsystem, "net") != 0) {
135 udev->devt = udev_device_get_devt(udev);
136 if (major(udev->devt) == 0)
140 dbg("add '%s'", udev->dev->devpath);
141 setenv("DEVPATH", udev->dev->devpath, 1);
142 setenv("SUBSYSTEM", udev->dev->subsystem, 1);
144 udev_rules_get_name(&rules, udev);
145 if (udev->ignore_device) {
146 dbg("device event will be ignored");
149 if (udev->name[0] == '\0') {
150 dbg("device node creation supressed");
154 udev_add_device(udev);
156 if (udev_run && !list_empty(&udev->run_list)) {
157 struct name_entry *name_loop;
159 dbg("executing run list");
160 list_for_each_entry(name_loop, &udev->run_list, node) {
161 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
162 pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, "add");
164 run_program(name_loop->name, udev->dev->subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
168 udev_device_cleanup(udev);
173 static void exec_list(struct list_head *device_list)
175 struct device *loop_device;
176 struct device *tmp_device;
179 /* handle the "first" type devices first */
180 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
181 for (i = 0; first_list[i] != NULL; i++) {
182 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
183 add_device(loop_device->path);
184 list_del(&loop_device->node);
191 /* handle the devices we are allowed to, excluding the "last" type devices */
192 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
194 for (i = 0; last_list[i] != NULL; i++) {
195 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
203 add_device(loop_device->path);
204 list_del(&loop_device->node);
208 /* handle the rest of the devices left over, if any */
209 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
210 add_device(loop_device->path);
211 list_del(&loop_device->node);
216 static int has_devt(const char *path)
218 char filename[PATH_SIZE];
221 snprintf(filename, sizeof(filename), "%s/dev", path);
222 filename[sizeof(filename)-1] = '\0';
224 if (stat(filename, &statbuf) == 0)
230 static void udev_scan_block(struct list_head *device_list)
232 char base[PATH_SIZE];
236 snprintf(base, sizeof(base), "%s/block", sysfs_path);
237 base[sizeof(base)-1] = '\0';
241 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
242 char dirname[PATH_SIZE];
244 struct dirent *dent2;
246 if (dent->d_name[0] == '.')
249 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
250 dirname[sizeof(dirname)-1] = '\0';
251 if (has_devt(dirname))
252 device_list_insert(dirname, device_list);
256 /* look for partitions */
257 dir2 = opendir(dirname);
259 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
260 char dirname2[PATH_SIZE];
262 if (dent2->d_name[0] == '.')
265 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
266 dirname2[sizeof(dirname2)-1] = '\0';
268 if (has_devt(dirname2))
269 device_list_insert(dirname2, device_list);
278 static void udev_scan_class(struct list_head *device_list)
280 char base[PATH_SIZE];
284 snprintf(base, sizeof(base), "%s/class", sysfs_path);
285 base[sizeof(base)-1] = '\0';
289 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
290 char dirname[PATH_SIZE];
292 struct dirent *dent2;
294 if (dent->d_name[0] == '.')
297 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
298 dirname[sizeof(dirname)-1] = '\0';
300 dir2 = opendir(dirname);
302 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
303 char dirname2[PATH_SIZE];
305 if (dent2->d_name[0] == '.')
308 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
309 dirname2[sizeof(dirname2)-1] = '\0';
311 if (has_devt(dirname2) || strcmp(dent->d_name, "net") == 0)
312 device_list_insert(dirname2, device_list);
321 static void asmlinkage sig_handler(int signum)
332 int main(int argc, char *argv[], char *envp[])
334 LIST_HEAD(device_list);
335 struct sigaction act;
337 logging_init("udevstart");
339 dbg("version %s", UDEV_VERSION);
341 udev_run_str = getenv("UDEV_RUN");
342 udev_log_str = getenv("UDEV_LOG");
344 /* disable all logging if not explicitely requested */
345 if (udev_log_str == NULL)
346 udev_log_priority = 0;
348 /* set signal handlers */
349 memset(&act, 0x00, sizeof(act));
350 act.sa_handler = (void (*) (int))sig_handler;
351 sigemptyset (&act.sa_mask);
353 sigaction(SIGALRM, &act, NULL);
354 sigaction(SIGINT, &act, NULL);
355 sigaction(SIGTERM, &act, NULL);
357 /* trigger timeout to prevent hanging processes */
358 alarm(UDEV_ALARM_TIMEOUT);
361 udev_rules_init(&rules, 1);
363 udev_scan_class(&device_list);
364 udev_scan_block(&device_list);
365 exec_list(&device_list);
367 udev_rules_cleanup(&rules);