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'", 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(NULL);
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 udev_rules_run(udev);
155 udev_device_cleanup(udev);
159 static void exec_list(struct list_head *device_list)
161 struct device *loop_device;
162 struct device *tmp_device;
165 /* handle the "first" type devices first */
166 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
167 for (i = 0; first_list[i] != NULL; i++) {
168 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
169 add_device(loop_device->path);
170 list_del(&loop_device->node);
177 /* handle the devices we are allowed to, excluding the "last" type devices */
178 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
180 for (i = 0; last_list[i] != NULL; i++) {
181 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
189 add_device(loop_device->path);
190 list_del(&loop_device->node);
194 /* handle the rest of the devices left over, if any */
195 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
196 add_device(loop_device->path);
197 list_del(&loop_device->node);
202 static int has_devt(const char *path)
204 char filename[PATH_SIZE];
207 snprintf(filename, sizeof(filename), "%s/dev", path);
208 filename[sizeof(filename)-1] = '\0';
210 if (stat(filename, &statbuf) == 0)
216 static void udev_scan_block(struct list_head *device_list)
218 char base[PATH_SIZE];
222 snprintf(base, sizeof(base), "%s/block", sysfs_path);
223 base[sizeof(base)-1] = '\0';
227 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
228 char dirname[PATH_SIZE];
230 struct dirent *dent2;
232 if (dent->d_name[0] == '.')
235 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
236 dirname[sizeof(dirname)-1] = '\0';
237 if (has_devt(dirname))
238 device_list_insert(dirname, device_list);
242 /* look for partitions */
243 dir2 = opendir(dirname);
245 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
246 char dirname2[PATH_SIZE];
248 if (dent2->d_name[0] == '.')
251 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
252 dirname2[sizeof(dirname2)-1] = '\0';
254 if (has_devt(dirname2))
255 device_list_insert(dirname2, device_list);
264 static void udev_scan_class(struct list_head *device_list)
266 char base[PATH_SIZE];
270 snprintf(base, sizeof(base), "%s/class", sysfs_path);
271 base[sizeof(base)-1] = '\0';
275 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
276 char dirname[PATH_SIZE];
278 struct dirent *dent2;
280 if (dent->d_name[0] == '.')
283 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
284 dirname[sizeof(dirname)-1] = '\0';
286 dir2 = opendir(dirname);
288 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
289 char dirname2[PATH_SIZE];
291 if (dent2->d_name[0] == '.')
294 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
295 dirname2[sizeof(dirname2)-1] = '\0';
297 if (has_devt(dirname2) || strcmp(dent->d_name, "net") == 0)
298 device_list_insert(dirname2, device_list);
307 static void asmlinkage sig_handler(int signum)
318 int main(int argc, char *argv[], char *envp[])
320 LIST_HEAD(device_list);
321 struct sigaction act;
323 logging_init("udevstart");
326 dbg("version %s", UDEV_VERSION);
328 udev_run_str = getenv("UDEV_RUN");
329 udev_log_str = getenv("UDEV_LOG");
331 /* disable all logging if not explicitely requested */
332 if (udev_log_str == NULL)
333 udev_log_priority = 0;
335 /* set signal handlers */
336 memset(&act, 0x00, sizeof(act));
337 act.sa_handler = (void (*) (int))sig_handler;
338 sigemptyset (&act.sa_mask);
340 sigaction(SIGALRM, &act, NULL);
341 sigaction(SIGINT, &act, NULL);
342 sigaction(SIGTERM, &act, NULL);
344 /* trigger timeout to prevent hanging processes */
345 alarm(UDEV_ALARM_TIMEOUT);
348 udev_rules_init(&rules, 1);
350 udev_scan_class(&device_list);
351 udev_scan_block(&device_list);
352 exec_list(&device_list);
354 udev_rules_cleanup(&rules);