嵌入式 hi3518平台检测网线是否插上

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/********************************** (C) COPYRIGHT *******************************
* File Name          : linkstatus_check.c
* Author             : skdkjzz
* Date               : 2014/08/07
* Description        : 网线是否插上
*********************************************************************************/


#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <net/if.h>
#include <sys/utsname.h>
#include <limits.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/sockios.h>

#define ETHTOOL_GLINK   0x0000000a   /* Get link status (ethtool_value) */
struct ethtool_value {
                      unsigned int   cmd;
                      unsigned int   data;
                     };

int get_netlink_status(const char *if_name);



/****************************************************************
   return value:
   -1 -- error , details can check errno
   1  -- interface link up
   0  -- interface link down.
****************************************************************/
int get_netlink_status(const char *if_name)
{
    int skfd;
    struct ifreq ifr;
    struct ethtool_value edata;
    edata.cmd = ETHTOOL_GLINK;
    edata.data = 0;
    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name) - 1);
    ifr.ifr_data = (char *)&edata;
    if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) == 0)
        return -1;
    if (ioctl(skfd, SIOCETHTOOL, &ifr) == -1)
    {
       close(skfd);
       return -1;
    }
    close(skfd);
    return edata.data;
}


int main()
{
    char net_buf[10]="eth0";
    printf("Net link status: %s\n", get_netlink_status(net_buf) == 1 ? "up" : "down");
    return 0;
}



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