/* a structure to contain an internet address 
   defined in the include file in.h */
struct sockaddr_in {
        short   sin_family; /* should be AF_INET */
        u_short sin_port;
        struct  in_addr sin_addr;
        char    sin_zero[8]; /* not used, must be zero */
};

struct in_addr {
   unsigned long s_addr;
};