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	Add MASTER_CHANNEL() dialplan function, as well as a useful usage.
(closes issue #13140) Reported by: cpina Patches: 20090807__issue13140.diff.txt uploaded by tilghman (license 14) Tested by: lmadsen Change-type: feature git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@215301 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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		| @@ -55,6 +55,15 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$") | ||||
| 			will be space-delimited.</para> | ||||
| 		</description> | ||||
| 	</function> | ||||
| 	<function name="MASTER_CHANNEL" language="en_US"> | ||||
| 		<synopsis> | ||||
| 			Gets or sets variables on the master channel | ||||
| 		</synopsis> | ||||
| 		<description> | ||||
| 			<para>Allows access to the channel which created the current channel, if any.  If the channel is already | ||||
| 			a master channel, then accesses local channel variables.</para> | ||||
| 		</description> | ||||
| 	</function> | ||||
| 	<function name="CHANNEL" language="en_US"> | ||||
| 		<synopsis> | ||||
| 			Gets/sets various pieces of information about the channel. | ||||
| @@ -496,23 +505,55 @@ static struct ast_custom_function channels_function = { | ||||
| 	.read = func_channels_read, | ||||
| }; | ||||
|  | ||||
| static int func_mchan_read(struct ast_channel *chan, const char *function, | ||||
| 			     char *data, struct ast_str **buf, ssize_t len) | ||||
| { | ||||
| 	struct ast_channel *mchan = ast_channel_get_by_name(chan->linkedid); | ||||
| 	char *template = alloca(4 + strlen(data)); | ||||
| 	sprintf(template, "${%s}", data); /* SAFE */ | ||||
| 	ast_str_substitute_variables(buf, len, mchan ? mchan : chan, template); | ||||
| 	if (mchan) { | ||||
| 		ast_channel_unref(mchan); | ||||
| 	} | ||||
| 	return 0; | ||||
| } | ||||
|  | ||||
| static int func_mchan_write(struct ast_channel *chan, const char *function, | ||||
| 			      char *data, const char *value) | ||||
| { | ||||
| 	struct ast_channel *mchan = ast_channel_get_by_name(chan->linkedid); | ||||
| 	pbx_builtin_setvar_helper(mchan ? mchan : chan, data, value); | ||||
| 	if (mchan) { | ||||
| 		ast_channel_unref(mchan); | ||||
| 	} | ||||
| 	return 0; | ||||
| } | ||||
|  | ||||
| static struct ast_custom_function mchan_function = { | ||||
| 	.name = "MASTER_CHANNEL", | ||||
| 	.read2 = func_mchan_read, | ||||
| 	.write = func_mchan_write, | ||||
| }; | ||||
|  | ||||
| static int unload_module(void) | ||||
| { | ||||
| 	int res = 0; | ||||
| 	 | ||||
|  | ||||
| 	res |= ast_custom_function_unregister(&channel_function); | ||||
| 	res |= ast_custom_function_unregister(&channels_function); | ||||
| 	 | ||||
| 	res |= ast_custom_function_unregister(&mchan_function); | ||||
|  | ||||
| 	return res; | ||||
| } | ||||
|  | ||||
| static int load_module(void) | ||||
| { | ||||
| 	int res = 0; | ||||
| 	 | ||||
|  | ||||
| 	res |= ast_custom_function_register(&channel_function); | ||||
| 	res |= ast_custom_function_register(&channels_function); | ||||
| 	 | ||||
| 	res |= ast_custom_function_register(&mchan_function); | ||||
|  | ||||
| 	return res; | ||||
| } | ||||
|  | ||||
|   | ||||
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