1struct sockaddr_in { int sin_addr; };
2static void ConvertAddr (struct sockaddr_in *saddr, void **addr)
3{
4  *addr = (void *) &saddr->sin_addr;
5}
6unsigned char EnableLocalHost (struct sockaddr_in *ifa_addr)
7{
8  unsigned char * addr;
9  ConvertAddr(ifa_addr, (void **)&addr);
10  return addr[0];
11}
12