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 #define MAX_PATHLEN 1024
43 #define SYSBLOCK "/sys/block"
44 #define SYSCLASS "/sys/class"
47 struct list_head list;
48 char path[MAX_PATHLEN];
49 char subsys[MAX_PATHLEN];
52 /* sort files in lexical order */
53 static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
55 struct device *loop_device;
56 struct device *new_device;
58 list_for_each_entry(loop_device, device_list, list) {
59 if (strcmp(loop_device->path, path) > 0) {
64 new_device = malloc(sizeof(struct device));
65 if (new_device == NULL) {
70 strfieldcpy(new_device->path, path);
71 strfieldcpy(new_device->subsys, subsystem);
72 list_add_tail(&new_device->list, &loop_device->list);
76 static void udev_exec(const char *path, const char* subsystem)
78 /* Setup env variables. */
79 setenv("UDEV_NO_SLEEP", "1", 1);
81 /* Now call __udev_hotplug(). */
82 if (__udev_hotplug("add", path, subsystem)) {
83 dbg("Calling of udev_hotplug failed");
88 /* list of devices that we should run last due to any one of a number of reasons */
89 static char *last_list[] = {
90 "/block/dm", /* on here because dm wants to have the block devices around before it */
94 static void exec_list(struct list_head *device_list)
96 struct device *loop_device;
97 struct device *tmp_device;
99 /* handle the devices we are allowed to, excluding the "last" type devices */
100 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
103 for (i=0; last_list[i] != NULL; i++) {
104 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
112 udev_exec(loop_device->path, loop_device->subsys);
113 list_del(&loop_device->list);
117 /* handle the rest of the devices left over, if any */
118 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
119 udev_exec(loop_device->path, loop_device->subsys);
120 list_del(&loop_device->list);
125 static void udev_scan_block(void)
129 LIST_HEAD(device_list);
131 dir = opendir(SYSBLOCK);
133 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
134 char dirname[MAX_PATHLEN];
136 struct dirent *dent2;
138 if ((strcmp(dent->d_name, ".") == 0) ||
139 (strcmp(dent->d_name, "..") == 0))
142 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
143 dirname[MAX_PATHLEN-1] = '\0';
144 device_list_insert(dirname, "block", &device_list);
146 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
147 dir2 = opendir(dirname);
149 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
150 char dirname2[MAX_PATHLEN];
152 struct dirent *dent3;
154 if ((strcmp(dent2->d_name, ".") == 0) ||
155 (strcmp(dent2->d_name, "..") == 0))
158 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
159 dirname2[MAX_PATHLEN-1] = '\0';
161 dir3 = opendir(dirname2);
163 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
164 char filename[MAX_PATHLEN];
166 if (strcmp(dent3->d_name, "dev") == 0) {
167 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
168 dent->d_name, dent2->d_name);
169 filename[MAX_PATHLEN-1] = '\0';
170 device_list_insert(filename, "block", &device_list);
182 exec_list(&device_list);
185 static void udev_scan_class(void)
189 LIST_HEAD(device_list);
191 dir = opendir(SYSCLASS);
193 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
194 char dirname[MAX_PATHLEN];
196 struct dirent *dent2;
198 if ((strcmp(dent->d_name, ".") == 0) ||
199 (strcmp(dent->d_name, "..") == 0))
202 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
203 dirname[MAX_PATHLEN-1] = '\0';
204 dir2 = opendir(dirname);
206 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
207 char dirname2[MAX_PATHLEN-1];
209 struct dirent *dent3;
211 if ((strcmp(dent2->d_name, ".") == 0) ||
212 (strcmp(dent2->d_name, "..") == 0))
215 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
216 dirname2[MAX_PATHLEN-1] = '\0';
218 dir3 = opendir(dirname2);
220 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
221 char filename[MAX_PATHLEN];
223 if (strcmp(dent3->d_name, "dev") == 0) {
224 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
225 dent->d_name, dent2->d_name);
226 filename[MAX_PATHLEN-1] = '\0';
227 device_list_insert(filename, dent->d_name, &device_list);
239 exec_list(&device_list);