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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
#include "../udev.h"
struct udev {
int refcount;
void (*log_fn)(struct udev *udev,
int priority, const char *file, int line, const char *fn,
const char *format, va_list args);
};
void udev_log(struct udev *udev,
int priority, const char *file, int line, const char *fn,
const char *format, ...)
{
va_list args;
va_start(args, format);
udev->log_fn(udev, priority, file, line, fn, format, args);
va_end(args);
}
static void log_stderr(struct udev *udev,
int priority, const char *file, int line, const char *fn,
const char *format, va_list args)
{
static int log = -1;
if (log == -1) {
if (getenv("LIBUDEV_DEBUG") != NULL)
log = 1;
else
log = 0;
}
if (log == 1) {
fprintf(stderr, "libudev: %s: ", fn);
vfprintf(stderr, format, args);
}
}
/* glue to udev logging, needed until udev logging code is "fixed" */
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
va_start(args, format);
log_stderr(NULL, priority, NULL, 0, "", format, args);
va_end(args);
}
#endif
/**
* udev_new:
*
* Create udev library context.
*
* The initial refcount is 1, and needs to be decremented to
* release the ressources of the udev library context.
*
* Returns: a new udev library context
**/
struct udev *udev_new(void)
{
struct udev *udev;
udev = malloc(sizeof(struct udev));
if (udev == NULL)
return NULL;
memset(udev, 0x00, (sizeof(struct udev)));
udev->refcount = 1;
udev->log_fn = log_stderr;
udev_config_init();
sysfs_init();
log_info(udev, "context %p created\n", udev);
return udev;
}
/**
* udev_ref:
* @udev: udev library context
*
* Take a reference of the udev library context.
*
* Returns: the passed udev library context
**/
struct udev *udev_ref(struct udev *udev)
{
if (udev == NULL)
return NULL;
udev->refcount++;
return udev;
}
/**
* udev_unref:
* @udev: udev library context
*
* Drop a reference of the udev library context. If the refcount
* reaches zero, the ressources of the context will be released.
*
**/
void udev_unref(struct udev *udev)
{
if (udev == NULL)
return;
udev->refcount--;
if (udev->refcount > 0)
return;
sysfs_cleanup();
log_info(udev, "context %p released\n", udev);
free(udev);
}
/**
* udev_set_log_fn:
* @udev: udev library context
* @log_fn: function to be called for logging messages
*
* The built-in logging, which writes to stderr if the
* LIBUDEV_DEBUG environment variable is set, can be
* overridden by a custom function, to plug log messages
* into the users logging functionality.
*
**/
void udev_set_log_fn(struct udev *udev,
void (*log_fn)(struct udev *udev,
int priority, const char *file, int line, const char *fn,
const char *format, va_list args))
{
udev->log_fn = log_fn;
log_info(udev, "custom logging function %p registered\n", udev);
}
/**
* udev_get_sys_path:
* @udev: udev library context
*
* Retrieve the sysfs mount point. The default is "/sys". For
* testing purposes, it can be overridden with the environment
* variable SYSFS_PATH.
*
* Returns: the sys mount point
**/
const char *udev_get_sys_path(struct udev *udev)
{
if (udev == NULL)
return NULL;
return sysfs_path;
}
/**
* udev_get_dev_path:
* @udev: udev library context
*
* Retrieve the device directory path. The default value is "/dev",
* the actual value may be overridden in the udev configuration
* file.
*
* Returns: the device directory path
**/
const char *udev_get_dev_path(struct udev *udev)
{
if (udev == NULL)
return NULL;
return udev_root;
}
|
