1 #include <stdio.h>
 2 #include <string.h>
 3 #include <sys/socket.h>
 4 #include <sys/types.h>
 5 #include <sys/ioctl.h>
 6 #include <net/if.h>
 7 // #include <netinet/in.h>
 8 #include <arpa/inet.h>
 9 // #include <ifaddrs.h>
10 
11 #define IF_NAME   "eth0"
12
 
 
13 int main(void)
14 {
15     struct ifreq ifr;
16     int skfd = 0;
17     static char if_addr[16];
18 
19     if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
20     }   
21 
22     strcpy(ifr.ifr_name, IF_NAME);
23     if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0) {
24         close(skfd);
25     }   
 
26     strcpy(if_addr, inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));
27     printf("ipaddr : %s\n", if_addr);
28     close(skfd);
29 
30 }