不管网卡up与否，只要注册了网卡，如eth0，那么就可通过命令字 SIOCGIFHWADDR 获取本机的mac地址。
#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> int getmac(char * mac, char *ifname) { struct ifreq ifreq; int fd; if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) { perror ("socket"); return -1; } strcpy (ifreq.ifr_name, ifname); //Currently, only get eth0 if (ioctl (fd, SIOCGIFHWADDR, &ifreq) < 0) { close(fd); perror ("SIOCGIFHWADDR"); return -1; } close(fd); sprintf(mac,"%02x:%02x:%02x:%02x:%02x:%02x", (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(int argc, char *argv[]) { char mac[30]; int ret; char ifname[10] = {0}; if (argc < 2) { fprintf(stderr, "too few arguments!\n"); return -1; } memcpy(ifname, argv[1], strlen(argv[1])); ret = getmac(mac, ifname); if(ret) { fprintf(stderr, "getmac failed\n"); return -1; } fprintf(stdout, "ifname[%s], Mac addr:%s\n", ifname, mac); return 0; }编译代码并执行获取eth0的网卡Mac地址
mhp0114@mhp0114-virtual-machine:~/workspace/share/test$ gcc getmac.c -o getmac mhp0114@mhp0114-virtual-machine:~/workspace/share/test$ ./getmac eth0 ifname[eth0], Mac addr:00:0c:29:23:ca:ec
