#include	"unp.h"intsock_get_port(const struct sockaddr *sa, socklen_t salen){	switch (sa->sa_family) {	case AF_INET: {		struct sockaddr_in	*sin = (struct sockaddr_in *) sa;		return(sin->sin_port);	}#ifdef	IPV6	case AF_INET6: {		struct sockaddr_in6	*sin6 = (struct sockaddr_in6 *) sa;		return(sin6->sin6_port);	}#endif	}    return(-1);		/* ??? */}