檢查網路Port是否Link

PS.have to install ethtool tool



#include  <stdio.h>
#include  <stdlib.h>
#include  <string.h>
#include  <fcntl.h>
#include  <errno.h>
#include  <sys/ioctl.h>
#include  <sys/types.h>
#include  <sys/socket.h>
#include  <linux/if.h>


typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned char u8;


#include  <linux/sockios.h>
#include  <linux/ethtool.h>


int main()
{
    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, "eth0", 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);
    printf("========%d\n",edata.data);
}