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);
73 dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
77 /* list of devices that we should run last due to any one of a number of reasons */
78 static char *last_list[] = {
79 "/block/dm", /* on here because dm wants to have the block devices around before it */
83 /* list of devices that we should run first due to any one of a number of reasons */
84 static char *first_list[] = {
85 "/class/mem", /* people tend to like their memory devices around first... */
89 static void exec_list(struct list_head *device_list)
91 struct device *loop_device;
92 struct device *tmp_device;
95 /* handle the "first" type devices first */
96 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
97 for (i=0; first_list[i] != NULL; i++) {
98 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
99 udev_add_device(loop_device->path, loop_device->subsys, NOFAKE);
100 list_del(&loop_device->list);
107 /* handle the devices we are allowed to, excluding the "last" type devices */
108 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
110 for (i=0; last_list[i] != NULL; i++) {
111 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
119 udev_add_device(loop_device->path, loop_device->subsys, NOFAKE);
120 list_del(&loop_device->list);
124 /* handle the rest of the devices left over, if any */
125 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
126 udev_add_device(loop_device->path, loop_device->subsys, NOFAKE);
127 list_del(&loop_device->list);
132 static void udev_scan_block(void)
136 LIST_HEAD(device_list);
138 dir = opendir(SYSBLOCK);
140 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
141 char dirname[MAX_PATHLEN];
143 struct dirent *dent2;
145 if ((strcmp(dent->d_name, ".") == 0) ||
146 (strcmp(dent->d_name, "..") == 0))
149 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
150 dirname[MAX_PATHLEN-1] = '\0';
151 device_list_insert(dirname, "block", &device_list);
153 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
154 dir2 = opendir(dirname);
156 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
157 char dirname2[MAX_PATHLEN];
159 struct dirent *dent3;
161 if ((strcmp(dent2->d_name, ".") == 0) ||
162 (strcmp(dent2->d_name, "..") == 0))
165 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
166 dirname2[MAX_PATHLEN-1] = '\0';
168 dir3 = opendir(dirname2);
170 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
171 char filename[MAX_PATHLEN];
173 if (strcmp(dent3->d_name, "dev") == 0) {
174 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
175 dent->d_name, dent2->d_name);
176 filename[MAX_PATHLEN-1] = '\0';
177 device_list_insert(filename, "block", &device_list);
189 exec_list(&device_list);
192 static void udev_scan_class(void)
196 LIST_HEAD(device_list);
198 dir = opendir(SYSCLASS);
200 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
201 char dirname[MAX_PATHLEN];
203 struct dirent *dent2;
205 if ((strcmp(dent->d_name, ".") == 0) ||
206 (strcmp(dent->d_name, "..") == 0))
209 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
210 dirname[MAX_PATHLEN-1] = '\0';
211 dir2 = opendir(dirname);
213 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
214 char dirname2[MAX_PATHLEN-1];
216 struct dirent *dent3;
218 if ((strcmp(dent2->d_name, ".") == 0) ||
219 (strcmp(dent2->d_name, "..") == 0))
222 /* pass the net class as it is */
223 if (strcmp(dent->d_name, "net") == 0) {
224 snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
225 device_list_insert(dirname2, "net", &device_list);
229 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
230 dirname2[MAX_PATHLEN-1] = '\0';
231 dir3 = opendir(dirname2);
233 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
234 char filename[MAX_PATHLEN];
236 /* pass devices with a "dev" file */
237 if (strcmp(dent3->d_name, "dev") == 0) {
238 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
239 dent->d_name, dent2->d_name);
240 filename[MAX_PATHLEN-1] = '\0';
241 device_list_insert(filename, dent->d_name, &device_list);
254 exec_list(&device_list);