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, "%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);
115 return udev_add_device(&udev, class_dev);
118 static void exec_list(struct list_head *device_list)
120 struct device *loop_device;
121 struct device *tmp_device;
124 /* handle the "first" type devices first */
125 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
126 for (i=0; first_list[i] != NULL; i++) {
127 if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
128 add_device(loop_device->path, loop_device->subsys);
129 list_del(&loop_device->list);
136 /* handle the devices we are allowed to, excluding the "last" type devices */
137 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
139 for (i=0; last_list[i] != NULL; i++) {
140 if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
148 add_device(loop_device->path, loop_device->subsys);
149 list_del(&loop_device->list);
153 /* handle the rest of the devices left over, if any */
154 list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
155 add_device(loop_device->path, loop_device->subsys);
156 list_del(&loop_device->list);
161 static void udev_scan_block(void)
165 LIST_HEAD(device_list);
167 dir = opendir(SYSBLOCK);
169 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
170 char dirname[MAX_PATHLEN];
172 struct dirent *dent2;
174 if ((strcmp(dent->d_name, ".") == 0) ||
175 (strcmp(dent->d_name, "..") == 0))
178 snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
179 dirname[MAX_PATHLEN-1] = '\0';
180 device_list_insert(dirname, "block", &device_list);
182 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
183 dir2 = opendir(dirname);
185 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
186 char dirname2[MAX_PATHLEN];
188 struct dirent *dent3;
190 if ((strcmp(dent2->d_name, ".") == 0) ||
191 (strcmp(dent2->d_name, "..") == 0))
194 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
195 dirname2[MAX_PATHLEN-1] = '\0';
197 dir3 = opendir(dirname2);
199 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
200 char filename[MAX_PATHLEN];
202 if (strcmp(dent3->d_name, "dev") == 0) {
203 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
204 dent->d_name, dent2->d_name);
205 filename[MAX_PATHLEN-1] = '\0';
206 device_list_insert(filename, "block", &device_list);
218 exec_list(&device_list);
221 static void udev_scan_class(void)
225 LIST_HEAD(device_list);
227 dir = opendir(SYSCLASS);
229 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
230 char dirname[MAX_PATHLEN];
232 struct dirent *dent2;
234 if ((strcmp(dent->d_name, ".") == 0) ||
235 (strcmp(dent->d_name, "..") == 0))
238 snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
239 dirname[MAX_PATHLEN-1] = '\0';
240 dir2 = opendir(dirname);
242 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
243 char dirname2[MAX_PATHLEN];
245 struct dirent *dent3;
247 if ((strcmp(dent2->d_name, ".") == 0) ||
248 (strcmp(dent2->d_name, "..") == 0))
251 /* pass the net class as it is */
252 if (strcmp(dent->d_name, "net") == 0) {
253 snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
254 device_list_insert(dirname2, "net", &device_list);
258 snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
259 dirname2[MAX_PATHLEN-1] = '\0';
260 dir3 = opendir(dirname2);
262 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
263 char filename[MAX_PATHLEN];
265 /* pass devices with a "dev" file */
266 if (strcmp(dent3->d_name, "dev") == 0) {
267 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
268 dent->d_name, dent2->d_name);
269 filename[MAX_PATHLEN-1] = '\0';
270 device_list_insert(filename, dent->d_name, &device_list);
283 exec_list(&device_list);