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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.
34 #include <sys/types.h>
37 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_utils.h"
44 #define MAX_PATH_SIZE 512
47 struct list_head list
;
48 char path
[MAX_PATH_SIZE
];
49 char subsys
[MAX_PATH_SIZE
];
52 /* sort files in lexical order */
53 static int device_list_insert(const char *path
, char *subsystem
, struct list_head
*device_list
)
55 struct device
*loop_device
;
56 struct device
*new_device
;
58 dbg("insert: '%s'\n", path
);
60 list_for_each_entry(loop_device
, device_list
, list
) {
61 if (strcmp(loop_device
->path
, path
) > 0) {
66 new_device
= malloc(sizeof(struct device
));
67 if (new_device
== NULL
) {
72 strfieldcpy(new_device
->path
, path
);
73 strfieldcpy(new_device
->subsys
, subsystem
);
74 list_add_tail(&new_device
->list
, &loop_device
->list
);
75 dbg("add '%s' from subsys '%s'", new_device
->path
, new_device
->subsys
);
79 /* list of devices that we should run last due to any one of a number of reasons */
80 static char *last_list
[] = {
81 "/block/dm", /* on here because dm wants to have the block devices around before it */
85 /* list of devices that we should run first due to any one of a number of reasons */
86 static char *first_list
[] = {
87 "/class/mem", /* people tend to like their memory devices around first... */
91 static int add_device(const char *path
, const char *subsystem
)
94 struct sysfs_class_device
*class_dev
;
97 devpath
= &path
[strlen(sysfs_path
)];
99 /* set environment for callouts and dev.d/ */
100 setenv("DEVPATH", devpath
, 1);
101 setenv("SUBSYSTEM", subsystem
, 1);
103 dbg("exec : '%s' (%s)\n", devpath
, path
);
105 class_dev
= sysfs_open_class_device_path(path
);
106 if (class_dev
== NULL
) {
107 dbg ("sysfs_open_class_device_path failed");
111 udev_init_device(&udev
, devpath
, subsystem
);
112 udev_add_device(&udev
, class_dev
);
114 /* run dev.d/ scripts if we created a node or changed a netif name */
115 if (udev_dev_d
&& udev
.devname
[0] != '\0') {
116 setenv("DEVNAME", udev
.devname
, 1);
117 udev_multiplex_directory(&udev
, DEVD_DIR
, DEVD_SUFFIX
);
120 sysfs_close_class_device(class_dev
);
125 static void exec_list(struct list_head
*device_list
)
127 struct device
*loop_device
;
128 struct device
*tmp_device
;
131 /* handle the "first" type devices first */
132 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
133 for (i
= 0; first_list
[i
] != NULL
; i
++) {
134 if (strncmp(loop_device
->path
, first_list
[i
], strlen(first_list
[i
])) == 0) {
135 add_device(loop_device
->path
, loop_device
->subsys
);
136 list_del(&loop_device
->list
);
143 /* handle the devices we are allowed to, excluding the "last" type devices */
144 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
146 for (i
= 0; last_list
[i
] != NULL
; i
++) {
147 if (strncmp(loop_device
->path
, last_list
[i
], strlen(last_list
[i
])) == 0) {
155 add_device(loop_device
->path
, loop_device
->subsys
);
156 list_del(&loop_device
->list
);
160 /* handle the rest of the devices left over, if any */
161 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
162 add_device(loop_device
->path
, loop_device
->subsys
);
163 list_del(&loop_device
->list
);
168 static int has_devt(const char *directory
)
170 char filename
[MAX_PATH_SIZE
];
173 snprintf(filename
, MAX_PATH_SIZE
, "%s/dev", directory
);
174 filename
[MAX_PATH_SIZE
-1] = '\0';
176 if (stat(filename
, &statbuf
) == 0)
182 static void udev_scan_block(void)
184 char base
[MAX_PATH_SIZE
];
187 LIST_HEAD(device_list
);
189 snprintf(base
, MAX_PATH_SIZE
, "%s/block", sysfs_path
);
190 base
[MAX_PATH_SIZE
-1] = '\0';
194 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
195 char dirname
[MAX_PATH_SIZE
];
197 struct dirent
*dent2
;
199 if (dent
->d_name
[0] == '.')
202 snprintf(dirname
, MAX_PATH_SIZE
, "%s/%s", base
, dent
->d_name
);
203 dirname
[MAX_PATH_SIZE
-1] = '\0';
204 if (has_devt(dirname
))
205 device_list_insert(dirname
, "block", &device_list
);
209 snprintf(dirname
, MAX_PATH_SIZE
, "%s/%s", base
, dent
->d_name
);
210 dir2
= opendir(dirname
);
212 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
213 char dirname2
[MAX_PATH_SIZE
];
215 if (dent2
->d_name
[0] == '.')
218 snprintf(dirname2
, MAX_PATH_SIZE
, "%s/%s", dirname
, dent2
->d_name
);
219 dirname2
[MAX_PATH_SIZE
-1] = '\0';
221 if (has_devt(dirname2
))
222 device_list_insert(dirname2
, "block", &device_list
);
230 exec_list(&device_list
);
233 static void udev_scan_class(void)
235 char base
[MAX_PATH_SIZE
];
238 LIST_HEAD(device_list
);
240 snprintf(base
, MAX_PATH_SIZE
, "%s/class", sysfs_path
);
241 base
[MAX_PATH_SIZE
-1] = '\0';
245 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
246 char dirname
[MAX_PATH_SIZE
];
248 struct dirent
*dent2
;
250 if (dent
->d_name
[0] == '.')
253 snprintf(dirname
, MAX_PATH_SIZE
, "%s/%s", base
, dent
->d_name
);
254 dirname
[MAX_PATH_SIZE
-1] = '\0';
255 dir2
= opendir(dirname
);
257 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
258 char dirname2
[MAX_PATH_SIZE
];
260 if (dent2
->d_name
[0] == '.')
263 snprintf(dirname2
, MAX_PATH_SIZE
, "%s/%s", dirname
, dent2
->d_name
);
264 dirname2
[MAX_PATH_SIZE
-1] = '\0';
266 /* pass the net class as it is */
267 if (strcmp(dent
->d_name
, "net") == 0)
268 device_list_insert(dirname2
, "net", &device_list
);
269 else if (has_devt(dirname2
))
270 device_list_insert(dirname2
, dent
->d_name
, &device_list
);
278 exec_list(&device_list
);
283 /* set environment for callouts and dev.d/ */
284 setenv("ACTION", "add", 1);
285 setenv("UDEV_START", "1", 1);