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