linux c 检测网络状态_linux c 监听网络状态-优快云博客

本文链接：https://blog.youkuaiyun.com/linqiongjun86/article/details/48393807

该博客介绍了如何使用C语言在Linux系统中检测WiFi网络的状态。通过打开并读取`/sys/class/net/wlan0/operstate`文件来判断网络连接是否处于`up`或`down`状态，从而确定网络是否在线。

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http://stackoverflow.com/questions/808560/how-to-detect-the-physical-connected-state-of-a-network-cable-connector

http://blog.youkuaiyun.com/a954423389/article/details/7327950

获取wifi网络状态

#include <string.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

void connect_check_real ()
{
       int ret;
   int fp;
   char status[10];
        //一定要只读模式打开,读写模式打开不可以
   ///sys/class/net/wlan0/carrier 0:down 1:up
        fp = open ("/sys/class/net/wlan0/operstate",O_RDONLY);

        if (fp<0) {
       printf("open file operstate failure%d\n",fp);
       return;
        }

   memset(status,0,sizeof(status));
        ret = read (fp,status,10);
   printf("status:%s\n",status);
        if (NULL != strstr(status,"up"))
        {
            printf("on line now \n");
        }
        else if (NULL != strstr(status,"down"))
        {
            printf("off off \n");
        }
        else
        printf("unknow error\n");
        close (fp);
}