4 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 * Quick and dirty way to populate a /dev with udev if your system
7 * does not have access to a shell. Based originally on a patch to udev
8 * from Harald Hoyer <harald@redhat.com>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 #include <sys/types.h>
38 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_libc_wrapper.h"
41 #include "udev_version.h"
43 #include "udev_rules.h"
44 #include "udev_utils.h"
48 void log_message(int priority, const char *format, ...)
52 if (priority > udev_log_priority)
55 va_start(args, format);
56 vsyslog(priority, format, args);
62 struct list_head node;
64 char subsys[NAME_SIZE];
67 /* sort files in lexical order */
68 static int device_list_insert(const char *path, char *subsystem, struct list_head *device_list)
70 struct device *loop_device;
71 struct device *new_device;
73 dbg("insert: '%s'\n", path);
75 list_for_each_entry(loop_device, device_list, node) {
76 if (strcmp(loop_device->path, path) > 0) {
81 new_device = malloc(sizeof(struct device));
82 if (new_device == NULL) {
87 strlcpy(new_device->path, path, sizeof(new_device->path));
88 strlcpy(new_device->subsys, subsystem, sizeof(new_device->subsys));
89 list_add_tail(&new_device->node, &loop_device->node);
90 dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
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[] = {
102 "/class/mem", /* people tend to like their memory devices around first... */
106 static int add_device(const char *path, const char *subsystem)
109 struct sysfs_class_device *class_dev;
112 devpath = &path[strlen(sysfs_path)];
114 /* set environment for callouts and dev.d/ */
115 setenv("DEVPATH", devpath, 1);
116 setenv("SUBSYSTEM", subsystem, 1);
118 dbg("exec: '%s' (%s)\n", devpath, path);
120 class_dev = sysfs_open_class_device_path(path);
121 if (class_dev == NULL) {
122 dbg ("sysfs_open_class_device_path failed");
126 udev_init_device(&udev, devpath, subsystem, "add");
127 udev_add_device(&udev, class_dev);
129 if (udev.devname[0] != '\0')
130 setenv("DEVNAME", udev.devname, 1);
132 if (udev_run && !list_empty(&udev.run_list)) {
133 struct name_entry *name_loop;
135 dbg("executing run list");
136 list_for_each_entry(name_loop, &udev.run_list, node)
137 execute_command(name_loop->name, udev.subsystem);
140 /* run dev.d/ scripts if we created a node or changed a netif name */
141 if (udev_dev_d && udev.devname[0] != '\0')
142 udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
144 sysfs_close_class_device(class_dev);
145 udev_cleanup_device(&udev);
150 static void exec_list(struct list_head *device_list)
152 struct device *loop_device;
153 struct device *tmp_device;
156 /* handle the "first" type devices first */
157 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
158 for (i = 0; first_list[i] != NULL; i++) {
159 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
160 add_device(loop_device->path, loop_device->subsys);
161 list_del(&loop_device->node);
168 /* handle the devices we are allowed to, excluding the "last" type devices */
169 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
171 for (i = 0; last_list[i] != NULL; i++) {
172 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
180 add_device(loop_device->path, loop_device->subsys);
181 list_del(&loop_device->node);
185 /* handle the rest of the devices left over, if any */
186 list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
187 add_device(loop_device->path, loop_device->subsys);
188 list_del(&loop_device->node);
193 static int has_devt(const char *directory)
195 char filename[PATH_SIZE];
198 snprintf(filename, sizeof(filename), "%s/dev", directory);
199 filename[sizeof(filename)-1] = '\0';
201 if (stat(filename, &statbuf) == 0)
207 static void udev_scan_block(void)
209 char base[PATH_SIZE];
212 LIST_HEAD(device_list);
214 snprintf(base, sizeof(base), "%s/block", sysfs_path);
215 base[sizeof(base)-1] = '\0';
219 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
220 char dirname[PATH_SIZE];
222 struct dirent *dent2;
224 if (dent->d_name[0] == '.')
227 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
228 dirname[sizeof(dirname)-1] = '\0';
229 if (has_devt(dirname))
230 device_list_insert(dirname, "block", &device_list);
234 /* look for partitions */
235 dir2 = opendir(dirname);
237 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
238 char dirname2[PATH_SIZE];
240 if (dent2->d_name[0] == '.')
243 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
244 dirname2[sizeof(dirname2)-1] = '\0';
246 if (has_devt(dirname2))
247 device_list_insert(dirname2, "block", &device_list);
254 exec_list(&device_list);
257 static void udev_scan_class(void)
259 char base[PATH_SIZE];
262 LIST_HEAD(device_list);
264 snprintf(base, sizeof(base), "%s/class", sysfs_path);
265 base[sizeof(base)-1] = '\0';
269 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
270 char dirname[PATH_SIZE];
272 struct dirent *dent2;
274 if (dent->d_name[0] == '.')
277 snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
278 dirname[sizeof(dirname)-1] = '\0';
280 dir2 = opendir(dirname);
282 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
283 char dirname2[PATH_SIZE];
285 if (dent2->d_name[0] == '.')
288 snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
289 dirname2[sizeof(dirname2)-1] = '\0';
291 /* pass the net class as it is */
292 if (strcmp(dent->d_name, "net") == 0)
293 device_list_insert(dirname2, "net", &device_list);
294 else if (has_devt(dirname2))
295 device_list_insert(dirname2, dent->d_name, &device_list);
302 exec_list(&device_list);
305 static void asmlinkage sig_handler(int signum)
316 int main(int argc, char *argv[], char *envp[])
318 struct sigaction act;
320 logging_init("udev");
322 /* disable all logging if not explicitely requested */
323 if (getenv("UDEV_LOG") == NULL)
324 udev_log_priority = 0;
325 dbg("version %s", UDEV_VERSION);
327 /* set signal handlers */
328 memset(&act, 0x00, sizeof(act));
329 act.sa_handler = (void (*) (int))sig_handler;
330 sigemptyset (&act.sa_mask);
332 sigaction(SIGALRM, &act, NULL);
333 sigaction(SIGINT, &act, NULL);
334 sigaction(SIGTERM, &act, NULL);
336 /* trigger timeout to prevent hanging processes */
337 alarm(ALARM_TIMEOUT);
339 /* set environment for executed programs */
340 setenv("ACTION", "add", 1);
341 setenv("UDEV_START", "1", 1);