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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/***
This file is part of systemd.
Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
Copyright 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
systemd 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.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; 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 <limits.h>
#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
/**
* SECTION:libudev-queue
* @short_description: access to currently active events
*
* This exports the current state of the udev processing queue.
*/
/**
* udev_queue:
*
* Opaque object representing the current event queue in the udev daemon.
*/
struct udev_queue {
struct udev *udev;
int refcount;
};
/**
* udev_queue_new:
* @udev: udev library context
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev queue context.
*
* Returns: the udev queue context, or #NULL on error.
**/
_public_ struct udev_queue *udev_queue_new(struct udev *udev)
{
struct udev_queue *udev_queue;
if (udev == NULL)
return NULL;
udev_queue = new0(struct udev_queue, 1);
if (udev_queue == NULL)
return NULL;
udev_queue->refcount = 1;
udev_queue->udev = udev;
return udev_queue;
}
/**
* udev_queue_ref:
* @udev_queue: udev queue context
*
* Take a reference of a udev queue context.
*
* Returns: the same udev queue context.
**/
_public_ struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return NULL;
udev_queue->refcount++;
return udev_queue;
}
/**
* udev_queue_unref:
* @udev_queue: udev queue context
*
* Drop a reference of a udev queue context. If the refcount reaches zero,
* the resources of the queue context will be released.
*
* Returns: #NULL
**/
_public_ struct udev_queue *udev_queue_unref(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return NULL;
udev_queue->refcount--;
if (udev_queue->refcount > 0)
return NULL;
free(udev_queue);
return NULL;
}
/**
* udev_queue_get_udev:
* @udev_queue: udev queue context
*
* Retrieve the udev library context the queue context was created with.
*
* Returns: the udev library context.
**/
_public_ struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
{
if (udev_queue == NULL)
return NULL;
return udev_queue->udev;
}
/**
* udev_queue_get_kernel_seqnum:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: 0.
**/
_public_ unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
{
return 0;
}
/**
* udev_queue_get_udev_seqnum:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: 0.
**/
_public_ unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
{
return 0;
}
/**
* udev_queue_get_udev_is_active:
* @udev_queue: udev queue context
*
* Check if udev is active on the system.
*
* Returns: a flag indicating if udev is active.
**/
_public_ int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
{
return access("/run/udev/control", F_OK) >= 0;
}
/**
* udev_queue_get_queue_is_empty:
* @udev_queue: udev queue context
*
* Check if udev is currently processing any events.
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
{
return access("/run/udev/queue", F_OK) < 0;
}
/**
* udev_queue_get_seqnum_sequence_is_finished:
* @udev_queue: udev queue context
* @start: first event sequence number
* @end: last event sequence number
*
* This function is deprecated, it just returns the result of
* udev_queue_get_queue_is_empty().
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
unsigned long long int start, unsigned long long int end)
{
return udev_queue_get_queue_is_empty(udev_queue);
}
/**
* udev_queue_get_seqnum_is_finished:
* @udev_queue: udev queue context
* @seqnum: sequence number
*
* This function is deprecated, it just returns the result of
* udev_queue_get_queue_is_empty().
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
{
return udev_queue_get_queue_is_empty(udev_queue);
}
/**
* udev_queue_get_queued_list_entry:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: NULL.
**/
_public_ struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
{
return NULL;
}
|
