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.
33 #include <sys/types.h>
42 unsigned char logname[LOGNAME_SIZE];
43 void log_message(int level, const char *format, ...)
47 va_start(args, format);
48 vsyslog(level, format, args);
54 #define MAX_PATHLEN 1024
55 #define SYSBLOCK "/sys/block"
56 #define SYSCLASS "/sys/class"
57 #define UDEV_BIN "/sbin/udev"
60 struct list_head list;
61 char path[MAX_PATHLEN];
62 char subsys[MAX_PATHLEN];
65 /* sort files in lexical order */
66 static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
68 struct device *loop_device;
69 struct device *new_device;
71 list_for_each_entry(loop_device, device_list, list) {
72 if (strcmp(loop_device->path, path) > 0) {
77 new_device = malloc(sizeof(struct device));
78 if (new_device == NULL) {
83 strfieldcpy(new_device->path, path);
84 strfieldcpy(new_device->subsys, subsystem);
85 list_add_tail(&new_device->list, &loop_device->list);
89 static void udev_exec(const char *path, const char* subsystem)
92 char action[] = "ACTION=add";
93 char devpath[MAX_PATHLEN];
94 char nosleep[] = "UDEV_NO_SLEEP=1";
95 char *env[] = { action, devpath, nosleep, NULL };
97 strcpy(devpath, "DEVPATH=");
98 strfieldcat(devpath, path);
104 execle(UDEV_BIN, "udev", subsystem, NULL, env);
105 dbg("exec of child failed");
109 dbg("fork of child failed");
116 /* list of devices that we should run last due to any one of a number of reasons */
117 static char *last_list[] = {
118 "/block/dm", /* on here because dm wants to have the block devices around before it */
122 static void exec_list(struct list_head *device_list)
124 struct device *loop_device;
125 struct device *tmp_device;
127 /* handle the devices we are allowed to, excluding the "last" type devices */
128 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
131 for (i=0; last_list[i] != NULL; i++) {
132 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
140 udev_exec(loop_device->path, loop_device->subsys);
141 list_del(&loop_device->list);
145 /* handle the rest of the devices left over, if any */
146 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
147 udev_exec(loop_device->path, loop_device->subsys);
148 list_del(&loop_device->list);
153 static void udev_scan_block(void)
157 LIST_HEAD(device_list);
159 dir = opendir(SYSBLOCK);
161 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
162 char dirname[MAX_PATHLEN];
164 struct dirent *dent2;
166 if ((strcmp(dent->d_name, ".") == 0) ||
167 (strcmp(dent->d_name, "..") == 0))
170 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
171 dirname[MAX_PATHLEN-1] = '\0';
172 device_list_insert(dirname, "block", &device_list);
174 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
175 dir2 = opendir(dirname);
177 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
178 char dirname2[MAX_PATHLEN];
180 struct dirent *dent3;
182 if ((strcmp(dent2->d_name, ".") == 0) ||
183 (strcmp(dent2->d_name, "..") == 0))
186 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
187 dirname2[MAX_PATHLEN-1] = '\0';
189 dir3 = opendir(dirname2);
191 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
192 char filename[MAX_PATHLEN];
194 if (strcmp(dent3->d_name, "dev") == 0) {
195 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
196 dent->d_name, dent2->d_name);
197 filename[MAX_PATHLEN-1] = '\0';
198 device_list_insert(filename, "block", &device_list);
210 exec_list(&device_list);
213 static void udev_scan_class(void)
217 LIST_HEAD(device_list);
219 dir = opendir(SYSCLASS);
221 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
222 char dirname[MAX_PATHLEN];
224 struct dirent *dent2;
226 if ((strcmp(dent->d_name, ".") == 0) ||
227 (strcmp(dent->d_name, "..") == 0))
230 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
231 dirname[MAX_PATHLEN] = '\0';
232 dir2 = opendir(dirname);
234 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
235 char dirname2[MAX_PATHLEN-1];
237 struct dirent *dent3;
239 if ((strcmp(dent2->d_name, ".") == 0) ||
240 (strcmp(dent2->d_name, "..") == 0))
243 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
244 dirname2[MAX_PATHLEN-1] = '\0';
246 dir3 = opendir(dirname2);
248 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
249 char filename[MAX_PATHLEN];
251 if (strcmp(dent3->d_name, "dev") == 0) {
252 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
253 dent->d_name, dent2->d_name);
254 filename[MAX_PATHLEN-1] = '\0';
255 device_list_insert(filename, dent->d_name, &device_list);
267 exec_list(&device_list);
270 int main(int argc, char *argv[], char *envp[])
272 init_logging("udevstart");