udp_do_bind
static int udp_do_bind(conn_t *, struct sockaddr *, socklen_t, cred_t *,
error = udp_do_bind(connp, sa, len, cr, B_TRUE);
error = udp_do_bind(connp, (struct sockaddr *)&sin6addr, len,
error = udp_do_bind(connp, sa, tbr->ADDR_length, cr,