POLL_OUT
case POLL_OUT:
pipeselwakeup(rpipe, rpipe->pipe_peer, POLL_OUT);
pipeselwakeup(rpipe, rpipe->pipe_peer, POLL_OUT);
case POLL_OUT:
fownsignal(tp->tun_pgid, SIGIO, POLL_OUT, POLLOUT|POLLWRNORM,
sowakeup(so, &so->so_snd, POLL_OUT);