rresvport_af
int rresvport_af (int *, sa_family_t);
int rresvport_af(int *alport, sa_family_t af);
return rresvport_af(alport, AF_INET);
int rresvport_af(int *, int);
s = rresvport_af(&lport, ai->ai_family);
int s2 = rresvport_af(&lport, ai->ai_family), s3;
return rresvport_af(port, AF_INET);
s = rresvport_af(&lport, ai->ai_family);