gethostbyaddr_p
he1 = gethostbyaddr_p(cp, 4, AF_INET, net_data);
he1 = gethostbyaddr_p(src, 16, AF_INET6, net_data);
return (gethostbyaddr_p(addr, len, af, net_data));
extern struct hostent *gethostbyaddr_p __P((const char *, int, int,