ip 를 반환 하는 함수가 있는지요?

#include <net/if.h>
#include <sys/socket.h>
#include <stropts.h>
 
#ifdef   OS_LINUX
#include <linux/sockios.h>
#endif
 
#ifdef   OS_SOLARIS
#include <sys/sockio.h>
#endif
 
#define MAX_NIC 10
 
static char *
get_ipaddr(void)
{
   int i, fd;
   int numif;
   static char ip[INET_ADDRSTRLEN];
 
   struct ifconf ifc;
   struct ifreq ifr[MAX_NIC];
   struct in_addr addr;
 
   ifc.ifc_len = sizeof(ifr);
   ifc.ifc_ifcu.ifcu_req = ifr;
 
   if((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
      return NULL;
   }
   if(ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
      return NULL;
   }
   close(fd);
 
   numif = ifc.ifc_len / sizeof(struct ifreq);
   for(i = 0; i < numif; i++) {
      if(ifc.ifc_ifcu.ifcu_req[i].ifr_ifru.ifru_addr.sa_family != AF_INET) {
         continue;
      }
      addr = ((struct sockaddr_in *) &ifc.ifc_ifcu.ifcu_req[i].ifr_ifru.ifru_addr)->sin_addr;
      if(addr.s_addr == htonl(0x7f000001)) {   /* 127.0.0.1 */
         continue;
      }
      strcpy(ip, inet_ntoa(addr));
 
      return ip;
   }
 
   return NULL;
}