aboutsummaryrefslogtreecommitdiffstats
path: root/autoservice.c
blob: 0082ea87ac4f742a9c12b3129eaa9eac6e665eac (plain)
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
/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Automatic channel service routines
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#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/pbx.h>
#include <asterisk/frame.h>
#include <asterisk/sched.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/channel_pvt.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

AST_MUTEX_DEFINE_STATIC(autolock);

struct asent {
	struct ast_channel *chan;
	struct asent *next;
};

static struct asent *aslist = NULL;
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_mutex_lock(&autolock);
		as = aslist;
		while(as) {
			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");
			}
			as = as->next;
		}
		ast_mutex_unlock(&autolock);

/* 		if (!aslist)
			break; */
		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_mutex_lock(&autolock);
	needstart = (asthread == AST_PTHREADT_NULL) ? 1 : 0 /* aslist ? 0 : 1 */;
	as = aslist;
	while(as) {
		if (as->chan == chan)
			break;
		as = as->next;
	}
	if (!as) {
		as = malloc(sizeof(struct asent));
		if (as) {
			memset(as, 0, sizeof(struct asent));
			as->chan = chan;
			as->next = aslist;
			aslist = as;
			res = 0;
			if (needstart) {
				if (ast_pthread_create(&asthread, NULL, autoservice_run, NULL)) {
					ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
					free(aslist);
					aslist = NULL;
					res = -1;
				} else
					pthread_kill(asthread, SIGURG);
			}
		}
	}
	ast_mutex_unlock(&autolock);
	return res;
}

int ast_autoservice_stop(struct ast_channel *chan)
{
	int res = -1;
	struct asent *as, *prev;
	ast_mutex_lock(&autolock);
	as = aslist;
	prev = NULL;
	while(as) {
		if (as->chan == chan)
			break;
		prev = as;
		as = as->next;
	}
	if (as) {
		if (prev)
			prev->next = as->next;
		else
			aslist = as->next;
		free(as);
		if (!chan->_softhangup)
			res = 0;
	}
	if (asthread != AST_PTHREADT_NULL) 
		pthread_kill(asthread, SIGURG);
	ast_mutex_unlock(&autolock);
	/* Wait for it to un-block */
	while(chan->blocking)
		usleep(1000);
	return res;
}