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 add_device(char *path, char *subsys, int fake)
93 /* fake argument vector and environment for callouts and dev.d/ */
99 setenv("DEVPATH", path, 1);
100 setenv("ACTION", "add", 1);
101 udev_add_device(path, subsys, fake);
104 static void exec_list(struct list_head *device_list)
106 struct device *loop_device;
107 struct device *tmp_device;
110 /* handle the "first" type devices first */
111 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
112 for (i=0; first_list[i] != NULL; i++) {
113 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
114 add_device(loop_device->path, loop_device->subsys, NOFAKE);
115 list_del(&loop_device->list);
122 /* handle the devices we are allowed to, excluding the "last" type devices */
123 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
125 for (i=0; last_list[i] != NULL; i++) {
126 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
134 add_device(loop_device->path, loop_device->subsys, NOFAKE);
135 list_del(&loop_device->list);
139 /* handle the rest of the devices left over, if any */
140 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
141 add_device(loop_device->path, loop_device->subsys, NOFAKE);
142 list_del(&loop_device->list);
147 static void udev_scan_block(void)
151 LIST_HEAD(device_list);
153 dir = opendir(SYSBLOCK);
155 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
156 char dirname[MAX_PATHLEN];
158 struct dirent *dent2;
160 if ((strcmp(dent->d_name, ".") == 0) ||
161 (strcmp(dent->d_name, "..") == 0))
164 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
165 dirname[MAX_PATHLEN-1] = '\0';
166 device_list_insert(dirname, "block", &device_list);
168 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
169 dir2 = opendir(dirname);
171 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
172 char dirname2[MAX_PATHLEN];
174 struct dirent *dent3;
176 if ((strcmp(dent2->d_name, ".") == 0) ||
177 (strcmp(dent2->d_name, "..") == 0))
180 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
181 dirname2[MAX_PATHLEN-1] = '\0';
183 dir3 = opendir(dirname2);
185 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
186 char filename[MAX_PATHLEN];
188 if (strcmp(dent3->d_name, "dev") == 0) {
189 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
190 dent->d_name, dent2->d_name);
191 filename[MAX_PATHLEN-1] = '\0';
192 device_list_insert(filename, "block", &device_list);
204 exec_list(&device_list);
207 static void udev_scan_class(void)
211 LIST_HEAD(device_list);
213 dir = opendir(SYSCLASS);
215 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
216 char dirname[MAX_PATHLEN];
218 struct dirent *dent2;
220 if ((strcmp(dent->d_name, ".") == 0) ||
221 (strcmp(dent->d_name, "..") == 0))
224 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
225 dirname[MAX_PATHLEN-1] = '\0';
226 dir2 = opendir(dirname);
228 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
229 char dirname2[MAX_PATHLEN];
231 struct dirent *dent3;
233 if ((strcmp(dent2->d_name, ".") == 0) ||
234 (strcmp(dent2->d_name, "..") == 0))
237 /* pass the net class as it is */
238 if (strcmp(dent->d_name, "net") == 0) {
239 snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
240 device_list_insert(dirname2, "net", &device_list);
244 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
245 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 /* pass devices with a "dev" file */
252 if (strcmp(dent3->d_name, "dev") == 0) {
253 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
254 dent->d_name, dent2->d_name);
255 filename[MAX_PATHLEN-1] = '\0';
256 device_list_insert(filename, dent->d_name, &device_list);
269 exec_list(&device_list);