1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* libudev - interface to udev device information
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
struct udev_enumerate {
struct udev *udev;
int refcount;
struct list_head devices_list;
};
struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return NULL;
udev_enumerate->refcount++;
return udev_enumerate;
}
void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return;
udev_enumerate->refcount--;
if (udev_enumerate->refcount > 0)
return;
list_cleanup(udev_enumerate->udev, &udev_enumerate->devices_list);
free(udev_enumerate);
}
struct udev_list *udev_enumerate_get_devices_list(struct udev_enumerate *udev_enumerate)
{
if (udev_enumerate == NULL)
return NULL;
return list_get_entry(&udev_enumerate->devices_list);
}
static int devices_scan_subsystem(struct udev *udev,
const char *basedir, const char *subsystem, const char *subdir,
struct list_head *device_list)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
util_strlcat(path, basedir, sizeof(path));
util_strlcat(path, "/", sizeof(path));
util_strlcat(path, subsystem, sizeof(path));
if (subdir != NULL)
util_strlcat(path, subdir, sizeof(path));
dir = opendir(path);
if (dir == NULL)
return -1;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char syspath[UTIL_PATH_SIZE];
if (dent->d_name[0] == '.')
continue;
util_strlcpy(syspath, path, sizeof(syspath));
util_strlcat(syspath, "/", sizeof(syspath));
util_strlcat(syspath, dent->d_name, sizeof(syspath));
util_resolve_sys_link(udev, syspath, sizeof(syspath));
list_insert(udev, device_list, syspath, NULL, 1);
}
closedir(dir);
return 0;
}
static int devices_scan_subsystems(struct udev *udev,
const char *basedir, const char *subsystem, const char *subdir,
struct list_head *device_list)
{
char path[UTIL_PATH_SIZE];
DIR *dir;
struct dirent *dent;
if (subsystem != NULL)
return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list);
util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
util_strlcat(path, basedir, sizeof(path));
dir = opendir(path);
if (dir == NULL)
return -1;
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
if (dent->d_name[0] == '.')
continue;
devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list);
}
closedir(dir);
return 0;
}
static int devices_delay(struct udev *udev, const char *syspath)
{
static const char *delay_device_list[] = {
"/block/md",
"/block/dm-",
NULL
};
size_t len;
int i;
len = strlen(udev_get_sys_path(udev));
for (i = 0; delay_device_list[i] != NULL; i++) {
if (strstr(&syspath[len], delay_device_list[i]) != NULL) {
info(udev, "delaying: %s\n", syspath);
return 1;
}
}
return 0;
}
/**
* udev_enumerate_new_from_subsystems:
* @udev: udev library context
* @subsystem: the subsystem to enumerate
*
* Returns: an enumeration context
**/
struct udev_enumerate *udev_enumerate_new_from_subsystems(struct udev *udev, const char *subsystem)
{
struct udev_enumerate *udev_enumerate;
char base[UTIL_PATH_SIZE];
struct stat statbuf;
struct udev_list *list;
if (udev == NULL)
return NULL;
udev_enumerate = malloc(sizeof(struct udev_enumerate));
if (udev_enumerate == NULL)
return NULL;
memset(udev_enumerate, 0x00, (sizeof(struct udev_enumerate)));
udev_enumerate->refcount = 1;
udev_enumerate->udev = udev;
INIT_LIST_HEAD(&udev_enumerate->devices_list);
/* if we have /sys/subsystem/, forget all the old stuff */
util_strlcpy(base, udev_get_sys_path(udev), sizeof(base));
util_strlcat(base, "/subsystem", sizeof(base));
if (stat(base, &statbuf) == 0) {
devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &udev_enumerate->devices_list);
} else {
devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &udev_enumerate->devices_list);
devices_scan_subsystems(udev, "/class", subsystem, NULL, &udev_enumerate->devices_list);
}
/* sort delayed devices to the end of the list */
list = list_get_entry(&udev_enumerate->devices_list);
while (list != NULL) {
if (devices_delay(udev, udev_list_get_name(list)))
list_move_to_end(list, &udev_enumerate->devices_list);
list = udev_list_get_next(list);
}
return udev_enumerate;
}
|
