1 #include <stdio.h>  2 #include <stdlib.h>  3 #include <string.h>  4 #include <sys/socket.h>  5 #include <sys/select.h>  6 #include <sys/time.h>  7 #include <unistd.h>  8 #include <sys/ioctl.h>  9 #include <errno.h> 10 #include <arpa/inet.h> 11 #include <sys/socket.h> 12 #include <net/if.h> 13 #include <net/if_arp.h> 14 #include <netdb.h> 15  16 #define ETH_NAME  "p1p2" //网卡名字 17  18 int main() 19 { 20         int sock; 21         struct sockaddr_in sin; 22         struct ifreq ifr; 23  24         sock = socket(AF_INET, SOCK_DGRAM, 0); 25         if(sock < 0){ 26                 perror("socket"); 27                 return -1; 28         } 29  30         strcpy(ifr.ifr_name, ETH_NAME); 31         int ret = ioctl(sock, SIOCGIFADDR, &ifr); 32         if(ret < 0){ 33                 perror("ioctl"); 34                 return -1; 35         } 36  37         memcpy(&sin, &ifr.ifr_addr, sizeof(sin)); 38         printf("%s\n", inet_ntoa(sin.sin_addr)); 39         return 0; 40 }