linux下用C语言读取网卡MAC地址[转载→修改调整]

#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h> //for struct ifreq



void main(int argc, char *argv[]){ //void类型  argv参数就是 "eth0" "eth1"
    struct ifreq ifreq;
    int sock;


    if(argc!=2){
       printf("Usage : ethname\n");
       return ;
    }


    if((sock=socket(AF_INET,SOCK_STREAM,0))<0){
       perror("socket");
       return ;
    }
    strcpy(ifreq.ifr_name,argv[1]); //也可将argv[1]直接写成"eth0",

                                     //变成 void main(void)
    if(ioctl(sock,SIOCGIFHWADDR,&ifreq)<0)
    {
    perror("ioctl");
    return ;
    }
    printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
    (unsigned char)ifreq.ifr_hwaddr.sa_data[0],
    (unsigned char)ifreq.ifr_hwaddr.sa_data[1],
    (unsigned char)ifreq.ifr_hwaddr.sa_data[2],
    (unsigned char)ifreq.ifr_hwaddr.sa_data[3],
    (unsigned char)ifreq.ifr_hwaddr.sa_data[4],
    (unsigned char)ifreq.ifr_hwaddr.sa_data[5]); //打印结果
    return ;

}