]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udevstart.c
c4ec0f7b7abd132399d7fc77f73e2f46d5db7c20
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
);