]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udevstart.c
2d5553e95529c8870aa21c622d361e69c5a5abaa
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>
42 #define MAX_PATHLEN 1024
43 #define SYSBLOCK "/sys/block"
44 #define SYSCLASS "/sys/class"
47 struct list_head list
;
48 char path
[MAX_PATHLEN
];
49 char subsys
[MAX_PATHLEN
];
52 /* sort files in lexical order */
53 static int device_list_insert(char *path
, char *subsystem
, struct list_head
*device_list
)
55 struct device
*loop_device
;
56 struct device
*new_device
;
58 list_for_each_entry(loop_device
, device_list
, list
) {
59 if (strcmp(loop_device
->path
, path
) > 0) {
64 new_device
= malloc(sizeof(struct device
));
65 if (new_device
== NULL
) {
70 strfieldcpy(new_device
->path
, path
);
71 strfieldcpy(new_device
->subsys
, subsystem
);
72 list_add_tail(&new_device
->list
, &loop_device
->list
);
76 static void udev_exec(const char *path
, const char* subsystem
)
78 /* Now call __udev_hotplug(). */
79 if (__udev_hotplug("add", path
, subsystem
)) {
80 dbg("Calling of udev_hotplug failed");
85 /* list of devices that we should run last due to any one of a number of reasons */
86 static char *last_list
[] = {
87 "/block/dm", /* on here because dm wants to have the block devices around before it */
91 static void exec_list(struct list_head
*device_list
)
93 struct device
*loop_device
;
94 struct device
*tmp_device
;
96 /* handle the devices we are allowed to, excluding the "last" type devices */
97 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
100 for (i
=0; last_list
[i
] != NULL
; i
++) {
101 if (strncmp(loop_device
->path
, last_list
[i
], strlen(last_list
[i
])) == 0) {
109 udev_exec(loop_device
->path
, loop_device
->subsys
);
110 list_del(&loop_device
->list
);
114 /* handle the rest of the devices left over, if any */
115 list_for_each_entry_safe(loop_device
, tmp_device
, device_list
, list
) {
116 udev_exec(loop_device
->path
, loop_device
->subsys
);
117 list_del(&loop_device
->list
);
122 static void udev_scan_block(void)
126 LIST_HEAD(device_list
);
128 dir
= opendir(SYSBLOCK
);
130 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
131 char dirname
[MAX_PATHLEN
];
133 struct dirent
*dent2
;
135 if ((strcmp(dent
->d_name
, ".") == 0) ||
136 (strcmp(dent
->d_name
, "..") == 0))
139 snprintf(dirname
, MAX_PATHLEN
, "/block/%s", dent
->d_name
);
140 dirname
[MAX_PATHLEN
-1] = '\0';
141 device_list_insert(dirname
, "block", &device_list
);
143 snprintf(dirname
, MAX_PATHLEN
, "%s/%s", SYSBLOCK
, dent
->d_name
);
144 dir2
= opendir(dirname
);
146 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
147 char dirname2
[MAX_PATHLEN
];
149 struct dirent
*dent3
;
151 if ((strcmp(dent2
->d_name
, ".") == 0) ||
152 (strcmp(dent2
->d_name
, "..") == 0))
155 snprintf(dirname2
, MAX_PATHLEN
, "%s/%s", dirname
, dent2
->d_name
);
156 dirname2
[MAX_PATHLEN
-1] = '\0';
158 dir3
= opendir(dirname2
);
160 for (dent3
= readdir(dir3
); dent3
!= NULL
; dent3
= readdir(dir3
)) {
161 char filename
[MAX_PATHLEN
];
163 if (strcmp(dent3
->d_name
, "dev") == 0) {
164 snprintf(filename
, MAX_PATHLEN
, "/block/%s/%s",
165 dent
->d_name
, dent2
->d_name
);
166 filename
[MAX_PATHLEN
-1] = '\0';
167 device_list_insert(filename
, "block", &device_list
);
179 exec_list(&device_list
);
182 static void udev_scan_class(void)
186 LIST_HEAD(device_list
);
188 dir
= opendir(SYSCLASS
);
190 for (dent
= readdir(dir
); dent
!= NULL
; dent
= readdir(dir
)) {
191 char dirname
[MAX_PATHLEN
];
193 struct dirent
*dent2
;
195 if ((strcmp(dent
->d_name
, ".") == 0) ||
196 (strcmp(dent
->d_name
, "..") == 0))
199 snprintf(dirname
, MAX_PATHLEN
, "%s/%s", SYSCLASS
, dent
->d_name
);
200 dirname
[MAX_PATHLEN
-1] = '\0';
201 dir2
= opendir(dirname
);
203 for (dent2
= readdir(dir2
); dent2
!= NULL
; dent2
= readdir(dir2
)) {
204 char dirname2
[MAX_PATHLEN
-1];
206 struct dirent
*dent3
;
208 if ((strcmp(dent2
->d_name
, ".") == 0) ||
209 (strcmp(dent2
->d_name
, "..") == 0))
212 snprintf(dirname2
, MAX_PATHLEN
, "%s/%s", dirname
, dent2
->d_name
);
213 dirname2
[MAX_PATHLEN
-1] = '\0';
215 dir3
= opendir(dirname2
);
217 for (dent3
= readdir(dir3
); dent3
!= NULL
; dent3
= readdir(dir3
)) {
218 char filename
[MAX_PATHLEN
];
220 if (strcmp(dent3
->d_name
, "dev") == 0) {
221 snprintf(filename
, MAX_PATHLEN
, "/class/%s/%s",
222 dent
->d_name
, dent2
->d_name
);
223 filename
[MAX_PATHLEN
-1] = '\0';
224 device_list_insert(filename
, dent
->d_name
, &device_list
);
236 exec_list(&device_list
);