]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udev_start.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"
38 #include "udev_utils.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
;
96 /* set environment for callouts and dev.d/ */
97 setenv("DEVPATH", devpath
, 1);
98 setenv("SUBSYSTEM", subsystem
, 1);
100 snprintf(path
, SYSFS_PATH_MAX
, "%s%s", sysfs_path
, devpath
);
101 path
[SYSFS_PATH_MAX
-1] = '\0';
102 class_dev
= sysfs_open_class_device_path(path
);
103 if (class_dev
== NULL
) {
104 dbg ("sysfs_open_class_device_path failed");
108 udev_init_device(&udev
, devpath
, subsystem
);
109 udev_add_device(&udev
, class_dev
);
111 /* run dev.d/ scripts if we created a node or changed a netif name */
112 if (udev_dev_d
&& udev
.devname
[0] != '\0') {
113 setenv("DEVNAME", udev
.devname
, 1);
114 udev_multiplex_directory(&udev
, DEVD_DIR
, DEVD_SUFFIX
);
117 sysfs_close_class_device(class_dev
);
122 static void exec_list(struct list_head
*device_list
)
124 struct device
*loop_device
;
125 struct device
*tmp_device
;
128 /* handle the "first" type devices first */
129 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
130 for (i
=0; first_list
[i
] != NULL
; i
++) {
131 if (strncmp(loop_device
->path
, first_list
[i
], strlen(first_list
[i
])) == 0) {
132 add_device(loop_device
->path
, loop_device
->subsys
);
133 list_del(&loop_device
->list
);
140 /* handle the devices we are allowed to, excluding the "last" type devices */
141 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
143 for (i
=0; last_list
[i
] != NULL
; i
++) {
144 if (strncmp(loop_device
->path
, last_list
[i
], strlen(last_list
[i
])) == 0) {
152 add_device(loop_device
->path
, loop_device
->subsys
);
153 list_del(&loop_device
->list
);
157 /* handle the rest of the devices left over, if any */
158 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
159 add_device(loop_device
->path
, loop_device
->subsys
);
160 list_del(&loop_device
->list
);
165 static void udev_scan_block(void)
169 LIST_HEAD(device_list
);
171 dir
= opendir(SYSBLOCK
);
173 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
174 char dirname
[MAX_PATHLEN
];
176 struct dirent
*dent2
;
178 if ((strcmp(dent
->d_name
, ".") == 0) ||
179 (strcmp(dent
->d_name
, "..") == 0))
182 snprintf(dirname
, MAX_PATHLEN
, "/block/%s", dent
->d_name
);
183 dirname
[MAX_PATHLEN
-1] = '\0';
184 device_list_insert(dirname
, "block", &device_list
);
186 snprintf(dirname
, MAX_PATHLEN
, "%s/%s", SYSBLOCK
, dent
->d_name
);
187 dir2
= opendir(dirname
);
189 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
190 char dirname2
[MAX_PATHLEN
];
192 struct dirent
*dent3
;
194 if ((strcmp(dent2
->d_name
, ".") == 0) ||
195 (strcmp(dent2
->d_name
, "..") == 0))
198 snprintf(dirname2
, MAX_PATHLEN
, "%s/%s", dirname
, dent2
->d_name
);
199 dirname2
[MAX_PATHLEN
-1] = '\0';
201 dir3
= opendir(dirname2
);
203 for (dent3
= readdir(dir3
); dent3
!= NULL
; dent3
= readdir(dir3
)) {
204 char filename
[MAX_PATHLEN
];
206 if (strcmp(dent3
->d_name
, "dev") == 0) {
207 snprintf(filename
, MAX_PATHLEN
, "/block/%s/%s",
208 dent
->d_name
, dent2
->d_name
);
209 filename
[MAX_PATHLEN
-1] = '\0';
210 device_list_insert(filename
, "block", &device_list
);
222 exec_list(&device_list
);
225 static void udev_scan_class(void)
229 LIST_HEAD(device_list
);
231 dir
= opendir(SYSCLASS
);
233 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
234 char dirname
[MAX_PATHLEN
];
236 struct dirent
*dent2
;
238 if ((strcmp(dent
->d_name
, ".") == 0) ||
239 (strcmp(dent
->d_name
, "..") == 0))
242 snprintf(dirname
, MAX_PATHLEN
, "%s/%s", SYSCLASS
, dent
->d_name
);
243 dirname
[MAX_PATHLEN
-1] = '\0';
244 dir2
= opendir(dirname
);
246 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
247 char dirname2
[MAX_PATHLEN
];
249 struct dirent
*dent3
;
251 if ((strcmp(dent2
->d_name
, ".") == 0) ||
252 (strcmp(dent2
->d_name
, "..") == 0))
255 /* pass the net class as it is */
256 if (strcmp(dent
->d_name
, "net") == 0) {
257 snprintf(dirname2
, MAX_PATHLEN
, "/class/net/%s", dent2
->d_name
);
258 device_list_insert(dirname2
, "net", &device_list
);
262 snprintf(dirname2
, MAX_PATHLEN
, "%s/%s", dirname
, dent2
->d_name
);
263 dirname2
[MAX_PATHLEN
-1] = '\0';
264 dir3
= opendir(dirname2
);
266 for (dent3
= readdir(dir3
); dent3
!= NULL
; dent3
= readdir(dir3
)) {
267 char filename
[MAX_PATHLEN
];
269 /* pass devices with a "dev" file */
270 if (strcmp(dent3
->d_name
, "dev") == 0) {
271 snprintf(filename
, MAX_PATHLEN
, "/class/%s/%s",
272 dent
->d_name
, dent2
->d_name
);
273 filename
[MAX_PATHLEN
-1] = '\0';
274 device_list_insert(filename
, dent
->d_name
, &device_list
);
287 exec_list(&device_list
);
292 /* set environment for callouts and dev.d/ */
293 setenv("ACTION", "add", 1);
294 setenv("UDEV_START", "1", 1);