linux c 获取本地MAC地址

#include   <stdio.h> 
#include   <sys/ioctl.h> 
#include   <sys/socket.h> 
#include   <netinet/in.h> 
#include   <net/if.h> 
#include   <string.h> 

int   main(int   argc,   char   *argv[]) 
{ 

    struct   ifreq   ifreq; 
    int   sock; 

    if(argc!=2) 
    { 
        printf( "Usage   :   ethname\n "); 
        return   1; 
    } 
    if((sock=socket(AF_INET,SOCK_STREAM,0)) <0) 
    { 
        perror( "socket "); 
        return   2; 
    } 
    strcpy(ifreq.ifr_name,argv[1]); 
    if(ioctl(sock,SIOCGIFHWADDR,&ifreq) <0) 
    { 
        perror( "ioctl "); 
        return   3; 
    } 
    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]); 
    return   0; 
} 

 

用法：

./a.out eth0