91 lines
1.5 KiB
C
91 lines
1.5 KiB
C
/*
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* Copyright (c) 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*
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* @(#)tty_tty.c 1.2 (2.11BSD GTE) 11/29/94
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*/
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/*
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* Indirect driver for controlling tty.
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*
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*/
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#include "param.h"
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#include "user.h"
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#include "proc.h"
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#include "ioctl.h"
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#include "tty.h"
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#include "conf.h"
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const struct devspec sydevs[] = {
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{ 0, "tty" },
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{ 0, 0 }
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};
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/*ARGSUSED*/
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int
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syopen (dev, flag)
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dev_t dev;
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int flag;
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{
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if (u.u_ttyp == NULL)
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return (ENXIO);
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return((*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag, 0));
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}
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/*ARGSUSED*/
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int
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syread (dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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if (u.u_ttyp == NULL)
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return (ENXIO);
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return ((*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd, uio, flag));
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}
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/*ARGSUSED*/
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int
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sywrite (dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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{
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if (u.u_ttyp == NULL)
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return (ENXIO);
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return ((*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd, uio, flag));
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}
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/*ARGSUSED*/
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int
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syioctl (dev, cmd, addr, flag)
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dev_t dev;
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u_int cmd;
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caddr_t addr;
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int flag;
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{
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if (cmd == TIOCNOTTY) {
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u.u_ttyp = 0;
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u.u_ttyd = 0;
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u.u_procp->p_pgrp = 0;
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return (0);
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}
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if (u.u_ttyp == NULL)
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return (ENXIO);
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return ((*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag));
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}
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/*ARGSUSED*/
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int
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syselect (dev, flag)
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dev_t dev;
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int flag;
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{
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if (u.u_ttyp == NULL) {
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u.u_error = ENXIO;
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return (0);
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}
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return ((*cdevsw[major(u.u_ttyd)].d_select)(u.u_ttyd, flag));
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}
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