2 * quick and dirty way to populate a /dev directory
4 * Copyright (C) 2004 Harald Hoyer <harald@redhat.com>
5 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
35 #include <sys/types.h>
38 #include "udev_rules.h"
39 #include "udev_selinux.h"
41 static const char *udev_run_str;
42 static const char *udev_log_str;
43 static struct udev_rules rules;
46 void log_message(int priority, const char *format, ...)
50 if (priority > udev_log_priority)
53 va_start(args, format);
54 vsyslog(priority, format, args);
60 struct list_head node;
64 /* sort files in lexical order */
65 static int device_list_insert(const char *path, struct list_head *device_list)
67 struct device *loop_device;
68 struct device *new_device;
69 const char *devpath = &path[strlen(sysfs_path)];
71 dbg("insert: '%s'\n", devpath);
73 list_for_each_entry(loop_device, device_list, node) {
74 if (strcmp(loop_device->path, devpath) > 0) {
79 new_device = malloc(sizeof(struct device));
80 if (new_device == NULL) {
85 strlcpy(new_device->path, devpath, sizeof(new_device->path));
86 list_add_tail(&new_device->node, &loop_device->node);
87 dbg("add '%s'" , new_device->path);
91 /* list of devices that we should run last due to any one of a number of reasons */
92 static char *last_list[] = {
93 "/block/dm", /* on here because dm wants to have the block devices around before it */
97 /* list of devices that we should run first due to any one of a number of reasons */
98 static char *first_list[] = {
104 static int add_device(const char *devpath)
106 struct sysfs_device *dev;
107 struct udevice *udev;
110 /* clear and set environment for next event */
112 setenv("ACTION", "add", 1);
113 setenv("UDEV_START", "1", 1);
115 setenv("UDEV_LOG", udev_log_str, 1);
117 setenv("UDEV_RUN", udev_run_str, 1);
119 dev = sysfs_device_get(devpath);
123 udev = udev_device_init();
127 /* override built-in sysfs device */
129 strcpy(udev->action, "add");
131 if (strcmp(udev->dev->subsystem, "net") != 0) {
132 udev->devt = udev_device_get_devt(udev);
133 if (major(udev->devt) == 0)
137 dbg("add '%s'", udev->dev->devpath);
138 setenv("DEVPATH", udev->dev->devpath, 1);
139 setenv("SUBSYSTEM", udev->dev->subsystem, 1);
141 udev_rules_get_name(&rules, udev);
142 if (udev->ignore_device) {
143 dbg("device event will be ignored");
146 if (udev->name[0] != '\0')
147 retval = udev_device_event(&rules, udev);
149 info("device node creation supressed");
151 if (retval == 0 && udev_run) {
152 struct name_entry *name_loop;
154 dbg("executing run list");
155 list_for_each_entry(name_loop, &udev->run_list, node) {
156 if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
157 pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, "add");
159 char program[PATH_SIZE];
161 strlcpy(program, name_loop->name, sizeof(program));
162 udev_rules_apply_format(udev, program, sizeof(program));
163 run_program(program, udev->dev->subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
169 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");
340 dbg("version %s", UDEV_VERSION);
342 udev_run_str = getenv("UDEV_RUN");
343 udev_log_str = getenv("UDEV_LOG");
345 /* disable all logging if not explicitely requested */
346 if (udev_log_str == NULL)
347 udev_log_priority = 0;
349 /* set signal handlers */
350 memset(&act, 0x00, sizeof(act));
351 act.sa_handler = (void (*) (int))sig_handler;
352 sigemptyset (&act.sa_mask);
354 sigaction(SIGALRM, &act, NULL);
355 sigaction(SIGINT, &act, NULL);
356 sigaction(SIGTERM, &act, NULL);
358 /* trigger timeout to prevent hanging processes */
359 alarm(UDEV_ALARM_TIMEOUT);
362 udev_rules_init(&rules, 1);
364 udev_scan_class(&device_list);
365 udev_scan_block(&device_list);
366 exec_list(&device_list);
368 udev_rules_cleanup(&rules);