klclose

P396

KL11のクローズ処理を行う(wflushtty)

klclose(dev)
{
    register struct tty *tp;

    tp = &kl11[dev.d_minor];
    /* 実際の処理 */
    wflushtty(tp);
    /* 状態を保存する */
    tp->t_state = 0;
}

dmr/tty.c

他の処理をスリープしつつ、キューを空にする

/*
 * Wait for output to drain, then flush input waiting.
 */
wflushtty(atp)
struct tty *atp;
{
    register struct tty *tp;

    tp = atp;
    /* 他の処理を止める */
    spl5();
    while (tp->t_outq.c_cc) {
        tp->t_state =| ASLEEP;
        sleep(&tp->t_outq, TTOPRI);
    }
    /* 実際の処理 */
    flushtty(tp);
    spl0();
}

wflushttyの実際の処理

/*
 * flush all TTY queues
 */
flushtty(atp)
struct tty *atp;
{
    register struct tty *tp;
    register int sps;

    tp = atp;
    while (getc(&tp->t_canq) >= 0);
    while (getc(&tp->t_outq) >= 0);
    wakeup(&tp->t_rawq);
    wakeup(&tp->t_outq);
    sps = PS->integ;
    spl5();
    while (getc(&tp->t_rawq) >= 0);
    tp->t_delct = 0;
    PS->integ = sps;
}