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#include <sys/ioctl.h>

int ioctl(int d, int request, ...);

/* Socket configuration controls. */

#define SIOCGIFADDR 0x8915    /* get PA address */ #define SIOCSIFADDR 0x8916    /* set PA address */ #define SIOCGIFHWADDR 0x8927  /* Get hardware address */

struct ifreq，Interface request structure，在头文件<net/if.h>

    #include <stdio.h>

    #include <unistd.h>     #include <sys/socket.h>     #include <arpa/inet.h>     #include <string.h>     #include <sys/ioctl.h>     #include <net/if.h>           int main()     {         int sock;         int res;         struct ifreq ifr;               sock = socket(AF_INET, SOCK_STREAM, 0);         strcpy(ifr.ifr_name, "eth0");         res = ioctl(sock, SIOCGIFADDR, &ifr);               printf("IP: %s\n",inet_ntoa(((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr));               strcpy(ifr.ifr_name, "eth0");         res = ioctl(sock, SIOCGIFHWADDR, &ifr);               int i;         char mac[32];         for(i = 0; i < 6; ++i)         {             sprintf(mac + 3*i, "%02x:", (unsigned char)ifr.ifr_hwaddr.sa_data[i]);         }         printf("MAC: %s\n",mac);               return 0;     }

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