linux ioctl命令

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char *argv[]) {
    int fd;
    struct ifreq ifr;

    if (argc != 2) {
        printf("Usage: %s <interface_name>\n", argv[0]);
        return 1;
    }

    fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (fd == -1) {
        perror("socket");
        return 1;
    }

    strncpy(ifr.ifr_name, argv[1], IFNAMSIZ-1);

    if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) {
        perror("ioctl");
        close(fd);
        return 1;
    }

    unsigned char *mac = (unsigned char *)ifr.ifr_hwaddr.sa_data;
    printf("MAC Address: %02X:%02X:%02X:%02X:%02X:%02X\n",
           mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

    close(fd);
    return 0;
}