#!/usr/bin/python

import re

def get_memory():

    i = 0

    key_num = re.compile('\d+')

    with open('/proc/meminfo', 'r') as f:

        for line in f:

            if line.startswith('MemFree') or line.startswith('Buffers') or line.startswith('Cached'):

                num = key_num.findall(line)

                i += int(num[0])

    return i

if __name__ == '__main__':

    print(get_memory())

/*

模块应该需要将内部函数定义为静态的，并使用与Zabbix内部不同的命名模式

避免和(zbx_*)和可加载模块API函数(zbx_module_*)冲突

/*

static int      BUFFER_FREE(AGENT_REQUEST *request, AGENT_RESULT *result);

/*

*key代表item里的key

*FLAG为CF_HAVEPARAMS或0(取决于项是否接受参数),

*FUNCTION是实现功能的具体函数

*test_param 是zabbix_agentd 使用-p启动时候用到的参数列表

/*

static ZBX_METRIC keys[] =

/*      KEY                     FLAG            FUNCTION        TEST PARAMETERS */

{

        {"buffers.cache.memory",        ,      BUFFER_FREE,    NULL},

        {NULL}

};

/*

 *获取buffer_free的数值:MemFree+Buffers+Cached

 * */

static int      BUFFER_FREE(AGENT_REQUEST *request, AGENT_RESULT *result)

{

        int             ret = SYSINFO_RET_FAIL;

        char            line[MAX_STRING_LEN];

        zbx_uint64_t    buffer_free = ;

        zbx_uint64_t    value = ;

        FILE            *f;

        ZBX_UNUSED(request);

        if (NULL == (f = fopen("/proc/meminfo", "r")))

        {

                SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Cannot open /proc/meminfo: %s", zbx_strerror(errno)));

                return SYSINFO_RET_FAIL;

        }

        while (NULL != fgets(line, sizeof(line), f))

        {

                if (( == strncmp(line, "MemFree:", )) || ( == strncmp(line, "Buffers:", )) || ( == strncmp(line, "Cached:", ))) //匹配三个指定的line

                {

                        if ( == sscanf(line, "%*s " ZBX_FS_UI64, &value)) //跳过第一个字符串，读取第二个字符串

                        {

                                buffer_free += value;//汇总求和

                        }

                }

        }

        SET_UI64_RESULT(result, buffer_free/);//K转换为M

        ret = SYSINFO_RET_OK;

        zbx_fclose(f);

        if (SYSINFO_RET_FAIL == ret)

                SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot find a line with \"haha\" in /proc/meminfo."));

        return ret;

}

/*

*如果成功获得项值，函数应该返回SYSINFO_RET_OK。否则，应该返回SYSINFO_RET_FAIL

*/