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;
 }