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git.ipfire.org Git - thirdparty/systemd.git/blob - udevstart.c
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
);