Linux编程获取本地IP

 #include <stdio.h>

 #include <sys/types.h>

 #include <ifaddrs.h>

 #include <netinet/in.h>

 #include <string.h>

 #include <stdlib.h>

 #include <arpa/inet.h>

 //获取本地IP地址

 char *getIP()

 {

      int sock_get_ip;

     char ipaddr[];

     struct   sockaddr_in *sin;

     struct   ifreq ifr_ip;

     if ((sock_get_ip=socket(AF_INET, SOCK_STREAM, )) == -)

     {

          printf("socket create failse...GetLocalIp!/n");

          return "";

     }

     memset(&ifr_ip, , sizeof(ifr_ip));

     strncpy(ifr_ip.ifr_name, "eth0", sizeof(ifr_ip.ifr_name) - );

     if( ioctl( sock_get_ip, SIOCGIFADDR, &ifr_ip) <  )

     {

          return "";

     }

     sin = (struct sockaddr_in *)&ifr_ip.ifr_addr;

     strcpy(ipaddr,inet_ntoa(sin->sin_addr));

     printf("local ip:%s /n",ipaddr);

     close( sock_get_ip );

     return ipaddr;

 }