Adding SYSINFO() dialplan function for retrieval of system information

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89421 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -44,6 +44,7 @@ Dialplan functions
     of devices or the name associated with a hint.
   * Added EXTENSION_STATE() dialplan function which allows retrieving the state
     of any extension.
+  * Added SYSINFO() dialplan function which allows retrieval of system information
 
 CLI Changes
 -----------

funcs/func_sysinfo.c

@@ -0,0 +1,122 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2007, Digium, Inc.
+ *
+ * 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
+ *
+ * SYSINFO function to return various system data.
+ * 
+ * \note Inspiration and Guidance from Russell
+ *
+ * \author Jeff Peeler
+ *
+ * \ingroup functions
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision: 87233 $")
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#if defined(HAVE_SYSINFO)
+#include <sys/sysinfo.h>
+#endif
+
+#include "asterisk/module.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/logger.h"
+#include "asterisk/utils.h"
+#include "asterisk/app.h"
+
+static int sysinfo_helper(struct ast_channel *chan, const char *cmd, char *data,
+		                         char *buf, size_t len)
+{
+#if defined(HAVE_SYSINFO)
+	struct sysinfo sys_info;
+	if (sysinfo(&sys_info)) {
+		ast_log(LOG_ERROR, "FAILED to retrieve system information\n");
+		return -1;
+	}
+#endif
+	if (ast_strlen_zero(data)) {
+		ast_log(LOG_WARNING, "Syntax: ${SYSINFO(<parameter>)} - missing argument!)\n");
+		return -1;
+	} else if (!strcasecmp("loadavg", data)) {
+		double curloadavg;
+		getloadavg(&curloadavg, 1);
+		snprintf(buf, len, "%f", curloadavg);
+	} else if (!strcasecmp("numcalls", data)) {
+		snprintf(buf, len, "%d", ast_active_calls());
+	}
+#if defined(HAVE_SYSINFO)
+	else if (!strcasecmp("uptime", data)) {             /* in hours */
+		snprintf(buf, len, "%ld", sys_info.uptime/3600);
+	} else if (!strcasecmp("totalram", data)) {         /* in KiB */
+		snprintf(buf, len, "%ld",(sys_info.totalram / sys_info.mem_unit)/1024);
+	} else if (!strcasecmp("freeram", data)) {          /* in KiB */
+		snprintf(buf, len, "%ld",(sys_info.freeram / sys_info.mem_unit)/1024);
+	} else if (!strcasecmp("bufferram", data)) {        /* in KiB */
+		snprintf(buf, len, "%ld",(sys_info.bufferram / sys_info.mem_unit)/1024);
+	} else if (!strcasecmp("totalswap", data)) {        /* in KiB */
+		snprintf(buf, len, "%ld",(sys_info.totalswap / sys_info.mem_unit)/1024);
+	} else if (!strcasecmp("freeswap", data)) {         /* in KiB */
+		snprintf(buf, len, "%ld",(sys_info.freeswap / sys_info.mem_unit)/1024);
+	} else if (!strcasecmp("numprocs", data)) {
+		snprintf(buf, len, "%d", sys_info.procs);
+	}
+#endif
+ 	else {
+		ast_log(LOG_ERROR, "Unknown sysinfo parameter type '%s'.\n", data);
+		return -1;
+	}
+		
+	return 0;
+}
+
+static struct ast_custom_function sysinfo_function = {
+	.name = "SYSINFO",
+	.synopsis = "Returns system information specified by parameter.",
+	.syntax = "SYSINFO(<parameter>)",
+	.read = sysinfo_helper,
+	.desc = 
+"Returns information from a given parameter\n"
+"  Options:\n"
+"    loadavg   - system load average from past minute\n"
+"    numcalls  - number of active calls currently in progress\n"
+"    uptime    - system uptime in hours\n"
+"    totalram  - total usable main memory size in KiB\n"
+"    freeram   - available memory size in KiB\n"
+"    bufferram - memory used by buffers in KiB\n"
+"    totalswap - total swap space size in KiB\n"
+"    freeswap  - free swap space still available in KiB\n"
+"    numprocs  - number of current processes\n",
+};
+
+static int unload_module(void)
+{
+	return ast_custom_function_unregister(&sysinfo_function);
+}
+
+static int load_module(void)
+{
+	return ast_custom_function_register(&sysinfo_function);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "System information related functions");
+