Wed Aug 18 22:33:52 2010

Asterisk developer's documentation


func_module.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * See http://www.asterisk.org for more information about
00007  * the Asterisk project. Please do not directly contact
00008  * any of the maintainers of this project for assistance;
00009  * the project provides a web site, mailing lists and IRC
00010  * channels for your use.
00011  *
00012  * This program is free software, distributed under the terms of
00013  * the GNU General Public License Version 2. See the LICENSE file
00014  * at the top of the source tree.
00015  */
00016 
00017 /*! \file
00018  *
00019  * \brief Simple module check function
00020  * \author Olle E. Johansson, Edvina.net
00021  *
00022  * \ingroup functions
00023  */
00024 #include "asterisk.h"
00025 
00026 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 89521 $")
00027 
00028 #include "asterisk/module.h"
00029 #include "asterisk/pbx.h"
00030 
00031 static int ifmodule_read(struct ast_channel *chan, const char *cmd, char *data,
00032           char *buf, size_t len)
00033 {
00034    char *ret = "0";
00035 
00036    *buf = '\0';
00037 
00038    if (data)
00039       if (ast_module_check(data))
00040          ret = "1";
00041 
00042    ast_copy_string(buf, ret, len);
00043 
00044    return 0;
00045 }
00046 
00047 static struct ast_custom_function ifmodule_function = {
00048    .name = "IFMODULE",
00049    .synopsis = "Checks if an Asterisk module is loaded in memory",
00050    .syntax = "IFMODULE(<modulename.so>)",
00051    .read = ifmodule_read,
00052    .desc = "Checks if a module is loaded. Use the full module name\n"
00053       "as shown by the list in \"module list\". \n"
00054       "Returns \"1\" if module exists in memory, otherwise \"0\".\n",
00055 };
00056 
00057 
00058 static int unload_module(void)
00059 {
00060    return ast_custom_function_unregister(&ifmodule_function);
00061 }
00062 
00063 static int load_module(void)
00064 {
00065    return ast_custom_function_register(&ifmodule_function);
00066 }
00067 
00068 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Checks if Asterisk module is loaded in memory");

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