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
|
/*
* libudev - interface to udev device information
*
* Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
static void udev_device_tag(struct udev_device *dev, const char *tag, bool add)
{
const char *id;
struct udev *udev = udev_device_get_udev(dev);
char filename[UTIL_PATH_SIZE];
id = udev_device_get_id_filename(dev);
if (id == NULL)
return;
util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/tags/", tag, "/", id, NULL);
if (add) {
int fd;
util_create_path(udev, filename);
fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
if (fd >= 0)
close(fd);
} else {
unlink(filename);
}
}
int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add)
{
struct udev_list_entry *list_entry;
bool found;
if (add && dev_old != NULL) {
/* delete possible left-over tags */
udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) {
const char *tag_old = udev_list_entry_get_name(list_entry);
struct udev_list_entry *list_entry_current;
found = false;
udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) {
const char *tag = udev_list_entry_get_name(list_entry_current);
if (strcmp(tag, tag_old) == 0) {
found = true;
break;
}
}
if (!found)
udev_device_tag(dev_old, tag_old, false);
}
}
udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev))
udev_device_tag(dev, udev_list_entry_get_name(list_entry), add);
return 0;
}
static bool device_has_info(struct udev_device *udev_device)
{
struct udev *udev = udev_device_get_udev(udev_device);
struct udev_list_entry *list_entry;
if (udev_device_get_devlinks_list_entry(udev_device) != NULL)
return true;
if (udev_device_get_devlink_priority(udev_device) != 0)
return true;
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
if (udev_list_entry_get_flags(list_entry))
return true;
if (udev_device_get_tags_list_entry(udev_device) != NULL)
return true;
if (udev_device_get_devnode(udev_device) != NULL && udev_device_get_knodename(udev_device) != NULL) {
size_t devlen = strlen(udev_get_dev_path(udev))+1;
if (strcmp(&udev_device_get_devnode(udev_device)[devlen], udev_device_get_knodename(udev_device)) != 0)
return true;
}
if (udev_device_get_watch_handle(udev_device) >= 0)
return true;
return false;
}
int udev_device_update_db(struct udev_device *udev_device)
{
bool has_info;
const char *id;
struct udev *udev = udev_device_get_udev(udev_device);
char filename[UTIL_PATH_SIZE];
char filename_tmp[UTIL_PATH_SIZE];
FILE *f;
id = udev_device_get_id_filename(udev_device);
if (id == NULL)
return -1;
has_info = device_has_info(udev_device);
util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data/", id, NULL);
/* do not store anything for otherwise empty devices */
if (!has_info &&
major(udev_device_get_devnum(udev_device)) == 0 &&
udev_device_get_ifindex(udev_device) == 0) {
unlink(filename);
return 0;
}
/* write a database file */
util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
util_create_path(udev, filename_tmp);
f = fopen(filename_tmp, "we");
if (f == NULL) {
err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
return -1;
}
if (has_info) {
size_t devlen = strlen(udev_get_dev_path(udev))+1;
struct udev_list_entry *list_entry;
if (udev_device_get_devnode(udev_device) != NULL) {
fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
}
if (udev_device_get_devlink_priority(udev_device) != 0)
fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
if (udev_device_get_watch_handle(udev_device) >= 0)
fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
if (udev_device_get_usec_initialized(udev_device) > 0)
fprintf(f, "I:%llu\n", udev_device_get_usec_initialized(udev_device));
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
if (!udev_list_entry_get_flags(list_entry))
continue;
fprintf(f, "E:%s=%s\n",
udev_list_entry_get_name(list_entry),
udev_list_entry_get_value(list_entry));
}
udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
}
fclose(f);
rename(filename_tmp, filename);
info(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty",
filename, udev_device_get_devpath(udev_device));
return 0;
}
int udev_device_delete_db(struct udev_device *udev_device)
{
const char *id;
struct udev *udev = udev_device_get_udev(udev_device);
char filename[UTIL_PATH_SIZE];
id = udev_device_get_id_filename(udev_device);
if (id == NULL)
return -1;
util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data/", id, NULL);
unlink(filename);
return 0;
}
|
