网络 -- Linux获取本机MAC地址

直接上代码：

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>        //for struct ifreq
 
int get_mac(char * mac, int len_limit)    //返回值是实际写入char * mac的字符个数（不包括'\0'）
{
    struct ifreq ifreq;    //ifreq结构体常用来配置和获取ip地址
    int sock;
 
    if ((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror ("socket");
        return -1;
    }
    strcpy (ifreq.ifr_name, "eth0");    //Currently, only get eth0
 
    if (ioctl (sock, SIOCGIFHWADDR, &ifreq) < 0)
    {
        perror ("ioctl");
        return -1;
    }
    
    return snprintf (mac, len_limit, "%X:%X:%X:%X:%X:%X", (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]);
}
 
int main()
{
    char    szMac[18];
    int        nRtn = get_mac(szMac, sizeof(szMac));
    if(nRtn > 0)
    {
        fprintf(stderr, "MAC ADDR: %s\n", szMac);
    }
    return 0;
}

在x86上gcc编译并运行没问题。