linux獲取MAC地址辦法

#include <net/if.h>
#include <string.h>

int tnfs_getNetMac()
{
    struct ifreq ifreq;
    int sock;

    if((sock=socket(AF_INET,SOCK_STREAM,0)) <0)
    {
        perror( "socket ");
        return 2;
    }


    char *device = "ens33"; // "eth0"
    strcpy(ifreq.ifr_name,device);
    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;
}

int main()
{
   tnfs_getNetMac();
   return 0;
}