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>
36 #include "libsysfs/sysfs/libsysfs.h"
43 #define MAX_PATHLEN 1024
44 #define SYSBLOCK "/sys/block"
45 #define SYSCLASS "/sys/class"
48 struct list_head list;
49 char path[MAX_PATHLEN];
50 char subsys[MAX_PATHLEN];
53 /* sort files in lexical order */
54 static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
56 struct device *loop_device;
57 struct device *new_device;
59 list_for_each_entry(loop_device, device_list, list) {
60 if (strcmp(loop_device->path, path) > 0) {
65 new_device = malloc(sizeof(struct device));
66 if (new_device == NULL) {
71 strfieldcpy(new_device->path, path);
72 strfieldcpy(new_device->subsys, subsystem);
73 list_add_tail(&new_device->list, &loop_device->list);
74 dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
78 /* list of devices that we should run last due to any one of a number of reasons */
79 static char *last_list[] = {
80 "/block/dm", /* on here because dm wants to have the block devices around before it */
84 /* list of devices that we should run first due to any one of a number of reasons */
85 static char *first_list[] = {
86 "/class/mem", /* people tend to like their memory devices around first... */
90 static int add_device(char *devpath, char *subsystem)
93 char path[SYSFS_PATH_MAX];
94 struct sysfs_class_device *class_dev;
97 /* fake argument vector and environment for callouts and dev.d/ */
103 setenv("DEVPATH", devpath, 1);
104 setenv("ACTION", "add", 1);
106 snprintf(path, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
107 class_dev = sysfs_open_class_device_path(path);
108 if (class_dev == NULL) {
109 dbg ("sysfs_open_class_device_path failed");
113 udev_set_values(&udev, devpath, subsystem);
114 udev_add_device(&udev, class_dev);
117 dev_d_execute(&udev);
119 sysfs_close_class_device(class_dev);
124 static void exec_list(struct list_head *device_list)
126 struct device *loop_device;
127 struct device *tmp_device;
130 /* handle the "first" type devices first */
131 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
132 for (i=0; first_list[i] != NULL; i++) {
133 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
134 add_device(loop_device->path, loop_device->subsys);
135 list_del(&loop_device->list);
142 /* handle the devices we are allowed to, excluding the "last" type devices */
143 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
145 for (i=0; last_list[i] != NULL; i++) {
146 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
154 add_device(loop_device->path, loop_device->subsys);
155 list_del(&loop_device->list);
159 /* handle the rest of the devices left over, if any */
160 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
161 add_device(loop_device->path, loop_device->subsys);
162 list_del(&loop_device->list);
167 static void udev_scan_block(void)
171 LIST_HEAD(device_list);
173 dir = opendir(SYSBLOCK);
175 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
176 char dirname[MAX_PATHLEN];
178 struct dirent *dent2;
180 if ((strcmp(dent->d_name, ".") == 0) ||
181 (strcmp(dent->d_name, "..") == 0))
184 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
185 dirname[MAX_PATHLEN-1] = '\0';
186 device_list_insert(dirname, "block", &device_list);
188 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
189 dir2 = opendir(dirname);
191 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
192 char dirname2[MAX_PATHLEN];
194 struct dirent *dent3;
196 if ((strcmp(dent2->d_name, ".") == 0) ||
197 (strcmp(dent2->d_name, "..") == 0))
200 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
201 dirname2[MAX_PATHLEN-1] = '\0';
203 dir3 = opendir(dirname2);
205 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
206 char filename[MAX_PATHLEN];
208 if (strcmp(dent3->d_name, "dev") == 0) {
209 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
210 dent->d_name, dent2->d_name);
211 filename[MAX_PATHLEN-1] = '\0';
212 device_list_insert(filename, "block", &device_list);
224 exec_list(&device_list);
227 static void udev_scan_class(void)
231 LIST_HEAD(device_list);
233 dir = opendir(SYSCLASS);
235 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
236 char dirname[MAX_PATHLEN];
238 struct dirent *dent2;
240 if ((strcmp(dent->d_name, ".") == 0) ||
241 (strcmp(dent->d_name, "..") == 0))
244 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
245 dirname[MAX_PATHLEN-1] = '\0';
246 dir2 = opendir(dirname);
248 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
249 char dirname2[MAX_PATHLEN];
251 struct dirent *dent3;
253 if ((strcmp(dent2->d_name, ".") == 0) ||
254 (strcmp(dent2->d_name, "..") == 0))
257 /* pass the net class as it is */
258 if (strcmp(dent->d_name, "net") == 0) {
259 snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
260 device_list_insert(dirname2, "net", &device_list);
264 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
265 dirname2[MAX_PATHLEN-1] = '\0';
266 dir3 = opendir(dirname2);
268 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
269 char filename[MAX_PATHLEN];
271 /* pass devices with a "dev" file */
272 if (strcmp(dent3->d_name, "dev") == 0) {
273 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
274 dent->d_name, dent2->d_name);
275 filename[MAX_PATHLEN-1] = '\0';
276 device_list_insert(filename, dent->d_name, &device_list);
289 exec_list(&device_list);