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
|
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Automatic channel service routines
*
* \author Mark Spencer <markster@digium.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <math.h> /* For PI */
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/pbx.h"
#include "asterisk/frame.h"
#include "asterisk/sched.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/file.h"
#include "asterisk/translate.h"
#include "asterisk/manager.h"
#include "asterisk/chanvars.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/lock.h"
#include "asterisk/utils.h"
#define MAX_AUTOMONS 256
struct asent {
struct ast_channel *chan;
AST_LIST_ENTRY(asent) list;
};
static AST_LIST_HEAD_STATIC(aslist, asent);
static pthread_t asthread = AST_PTHREADT_NULL;
static void *autoservice_run(void *ign)
{
struct ast_channel *mons[MAX_AUTOMONS];
int x;
int ms;
struct ast_channel *chan;
struct asent *as;
struct ast_frame *f;
for(;;) {
x = 0;
AST_LIST_LOCK(&aslist);
AST_LIST_TRAVERSE(&aslist, as, list) {
if (!as->chan->_softhangup) {
if (x < MAX_AUTOMONS)
mons[x++] = as->chan;
else
ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
}
}
AST_LIST_UNLOCK(&aslist);
ms = 500;
chan = ast_waitfor_n(mons, x, &ms);
if (chan) {
/* Read and ignore anything that occurs */
f = ast_read(chan);
if (f)
ast_frfree(f);
}
}
asthread = AST_PTHREADT_NULL;
return NULL;
}
int ast_autoservice_start(struct ast_channel *chan)
{
int res = -1;
struct asent *as;
int needstart;
AST_LIST_LOCK(&aslist);
/* Check if autoservice thread is executing */
needstart = (asthread == AST_PTHREADT_NULL) ? 1 : 0 ;
/* Check if the channel already has autoservice */
AST_LIST_TRAVERSE(&aslist, as, list) {
if (as->chan == chan)
break;
}
/* If not, start autoservice on channel */
if (!as) {
as = calloc(1, sizeof(struct asent));
if (as) {
as->chan = chan;
AST_LIST_INSERT_HEAD(&aslist, as, list);
res = 0;
if (needstart) {
if (ast_pthread_create(&asthread, NULL, autoservice_run, NULL)) {
ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
/* There will only be a single member in the list at this point,
the one we just added. */
AST_LIST_REMOVE(&aslist, as, list);
free(as);
res = -1;
} else
pthread_kill(asthread, SIGURG);
}
}
}
AST_LIST_UNLOCK(&aslist);
return res;
}
int ast_autoservice_stop(struct ast_channel *chan)
{
int res = -1;
struct asent *as;
AST_LIST_LOCK(&aslist);
AST_LIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {
if (as->chan == chan) {
AST_LIST_REMOVE_CURRENT(&aslist, list);
free(as);
if (!chan->_softhangup)
res = 0;
break;
}
}
AST_LIST_TRAVERSE_SAFE_END
if (asthread != AST_PTHREADT_NULL)
pthread_kill(asthread, SIGURG);
AST_LIST_UNLOCK(&aslist);
/* Wait for it to un-block */
while(ast_test_flag(chan, AST_FLAG_BLOCKING))
usleep(1000);
return res;
}
|
