text: /*
  ** Zabbix
  ** Copyright (C) 2001-2021 Zabbix SIA
  **
  ** This program is free software; you can redistribute it and/or modify
  ** it under the terms of the GNU General Public License as published by
  ** the Free Software Foundation; either version 2 of the License, or
  ** (at your option) any later version.
  **
  ** This program is distributed in the hope that it will be useful,
  ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  ** GNU General Public License for more details.
  **
  ** You should have received a copy of the GNU General Public License
  ** along with this program; if not, write to the Free Software
  ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  **/
  
  #include "common.h"
  #include "sysinfo.h"
  #include "../common/common.h"
  
  static int	VM_MEMORY_TOTAL(AGENT_RESULT *result)
  {
  	return EXECUTE_INT("vmstat -s | awk 'BEGIN{pages=0}{gsub(\"[()]\",\"\");if($4==\"pagesize\")pgsize=($6);if(($2==\"inactive\"||$2==\"active\"||$2==\"wired\")&&$3==\"pages\")pages+=$1}END{printf (pages*pgsize)}'", result);
  }
  
  static int	VM_MEMORY_FREE(AGENT_RESULT *result)
  {
  	return EXECUTE_INT("vmstat -s | awk '{gsub(\"[()]\",\"\");if($4==\"pagesize\")pgsize=($6);if($2==\"free\"&&$3==\"pages\")pages=($1)}END{printf (pages*pgsize)}'", result);
  }
  
  static int	VM_MEMORY_USED(AGENT_RESULT *result)
  {
  	int		ret = SYSINFO_RET_FAIL;
  	AGENT_RESULT	result_tmp;
  	zbx_uint64_t	free, total;
  
  	init_result(&result_tmp);
  
  	if (SYSINFO_RET_OK != VM_MEMORY_FREE(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	free = result_tmp.ui64;
  
  	if (SYSINFO_RET_OK != VM_MEMORY_TOTAL(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	total = result_tmp.ui64;
  
  	SET_UI64_RESULT(result, total - free);
  
  	ret = SYSINFO_RET_OK;
  clean:
  	free_result(&result_tmp);
  
  	return ret;
  }
  
  static int	VM_MEMORY_PUSED(AGENT_RESULT *result)
  {
  	int		ret = SYSINFO_RET_FAIL;
  	AGENT_RESULT	result_tmp;
  	zbx_uint64_t	free, total;
  
  	init_result(&result_tmp);
  
  	if (SYSINFO_RET_OK != VM_MEMORY_FREE(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	free = result_tmp.ui64;
  
  	if (SYSINFO_RET_OK != VM_MEMORY_TOTAL(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	total = result_tmp.ui64;
  
  	if (0 == total)
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot calculate percentage because total is zero."));
  		goto clean;
  	}
  
  	SET_UI64_RESULT(result, (total - free) / (double)total * 100);
  
  	ret = SYSINFO_RET_OK;
  clean:
  	free_result(&result_tmp);
  
  	return ret;
  }
  
  static int	VM_MEMORY_AVAILABLE(AGENT_RESULT *result)
  {
  	return VM_MEMORY_FREE(result);
  }
  
  static int	VM_MEMORY_PAVAILABLE(AGENT_RESULT *result)
  {
  	int		ret = SYSINFO_RET_FAIL;
  	AGENT_RESULT	result_tmp;
  	zbx_uint64_t	free, total;
  
  	init_result(&result_tmp);
  
  	if (SYSINFO_RET_OK != VM_MEMORY_FREE(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	free = result_tmp.ui64;
  
  	if (SYSINFO_RET_OK != VM_MEMORY_TOTAL(&result_tmp))
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, result_tmp.msg));
  		goto clean;
  	}
  
  	total = result_tmp.ui64;
  
  	if (0 == total)
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot calculate percentage because total is zero."));
  		goto clean;
  	}
  
  	SET_UI64_RESULT(result, free / (double)total * 100);
  
  	ret = SYSINFO_RET_OK;
  clean:
  	free_result(&result_tmp);
  
  	return ret;
  }
  
  int     VM_MEMORY_SIZE(AGENT_REQUEST *request, AGENT_RESULT *result)
  {
  	char	*mode;
  	int	ret = SYSINFO_RET_FAIL;
  
  	if (1 < request->nparam)
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
  		return SYSINFO_RET_FAIL;
  	}
  
  	mode = get_rparam(request, 0);
  
  	if (NULL == mode || '\0' == *mode || 0 == strcmp(mode, "total"))
  		ret = VM_MEMORY_TOTAL(result);
  	else if (0 == strcmp(mode, "free"))
  		ret = VM_MEMORY_FREE(result);
  	else if (0 == strcmp(mode, "used"))
  		ret = VM_MEMORY_USED(result);
  	else if (0 == strcmp(mode, "pused"))
  		ret = VM_MEMORY_PUSED(result);
  	else if (0 == strcmp(mode, "available"))
  		ret = VM_MEMORY_AVAILABLE(result);
  	else if (0 == strcmp(mode, "pavailable"))
  		ret = VM_MEMORY_PAVAILABLE(result);
  	else
  	{
  		SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
  		return SYSINFO_RET_FAIL;
  	}
  
  	return ret;
  }
  