[unix-history] / usr / src / sys / kern / tty_pty.c

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)tty_pty.c	7.3.1.1 (Berkeley) %G%
 */

/*
 * Pseudo-teletype Driver
 * (Actually two drivers, requiring two entries in 'cdevsw')
 */
#include "pty.h"

#if NPTY > 0
#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "dir.h"
#include "user.h"
#include "conf.h"
#include "file.h"
#include "proc.h"
#include "uio.h"
#include "kernel.h"
#include "tsleep.h"

#if NPTY == 1
#undef NPTY
#define	NPTY	32		/* crude XXX */
#endif

#define BUFSIZ 100		/* Chunk size iomoved to/from user */

/*
 * pts == /dev/tty[pqrs]?
 * ptc == /dev/pty[pqrs]?
 */
struct	tty pt_tty[NPTY];
struct	pt_ioctl {
	int	pt_flags;
	struct	proc *pt_selr, *pt_selw;
	u_char	pt_send;
	u_char	pt_ucntl;
	struct	clist pt_ioc;
} pt_ioctl[NPTY];
int	npty = NPTY;		/* for pstat -t */

#define	PF_RCOLL	0x0001
#define	PF_WCOLL	0x0002
#define	PF_NBIO		0x0004
#define	PF_PKT		0x0008		/* packet mode */
#define	PF_STOPPED	0x0010		/* user told stopped */
#define	PF_REMOTE	0x0020		/* remote and flow controlled input */
#define	PF_NOSTOP	0x0040
#define	PF_UCNTL	0x0080		/* user control mode */
#define	PF_TIOC		0x0100		/* transparent control mode */
#define	PF_LIOC		0x0200		/* transparent control locked */
#define	PF_WIOC		0x0400		/* waiting for PF_LIOC to clear */
#define	PF_BLOCK	0x0800		/* block writes to slave */
#define	PF_OWAIT	0x1000		/* waiting for PF_BLOCK to clear */

/*ARGSUSED*/
ptsopen(dev, flag)
	dev_t dev;
{
	register struct tty *tp;
	int error;

#ifdef lint
	npty = npty;
#endif
	if (minor(dev) >= NPTY)
		return (ENXIO);
	tp = &pt_tty[minor(dev)];
	if ((tp->t_state & TS_ISOPEN) == 0) {
		ttychars(tp);		/* Set up default chars */
		tp->t_ispeed = tp->t_ospeed = EXTB;
		tp->t_flags = 0;	/* No features (nor raw mode) */
	} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0)
		return (EBUSY);
	if (tp->t_oproc)			/* Ctrlr still around. */
		tp->t_state |= TS_CARR_ON;
	while ((tp->t_state & TS_CARR_ON) == 0) {
		tp->t_state |= TS_WOPEN;
		sleep((caddr_t)&tp->t_rawq, TTIPRI);
	}
	error = (*linesw[tp->t_line].l_open)(dev, tp);
	ptcwakeup(tp, FREAD|FWRITE);
	return (error);
}

ptsclose(dev)
	dev_t dev;
{
	register struct tty *tp;

	tp = &pt_tty[minor(dev)];
	(*linesw[tp->t_line].l_close)(tp);
	ttyclose(tp);
	ptcwakeup(tp, FREAD|FWRITE);
	return (0);
}

ptsread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	int error = 0;

again:
	if (pti->pt_flags & PF_REMOTE) {
		while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
			if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) ||
			    (u.u_procp->p_sigmask & sigmask(SIGTTIN)) ||
			    u.u_procp->p_flag&SVFORK)
				return (EIO);
			gsignal(u.u_procp->p_pgrp, SIGTTIN);
			sleep((caddr_t)&lbolt, TTIPRI);
		}
		if (tp->t_canq.c_cc == 0) {
			if (tp->t_state & TS_NBIO)
				return (EWOULDBLOCK);
			sleep((caddr_t)&tp->t_canq, TTIPRI);
			goto again;
		}
		while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
			if (ureadc(getc(&tp->t_canq), uio) < 0) {
				error = EFAULT;
				break;
			}
		if (tp->t_canq.c_cc == 1)
			(void) getc(&tp->t_canq);
		if (tp->t_canq.c_cc)
			return (error);
	} else
		if (tp->t_oproc)
			error = (*linesw[tp->t_line].l_read)(tp, uio);
	ptcwakeup(tp, FWRITE);
	return (error);
}

/*
 * Write to pseudo-tty.
 * Wakeups of controlling tty will happen
 * indirectly, when tty driver calls ptsstart.
 */
ptswrite(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];

	if (tp->t_oproc == 0)
		return (EIO);

	while (pti->pt_flags & PF_BLOCK) {
		pti->pt_flags |= PF_OWAIT;
		sleep((caddr_t)pti + 1, TTOPRI);
	}

	return ((*linesw[tp->t_line].l_write)(tp, uio));
}

/*
 * Start output on pseudo-tty.
 * Wake up process selecting or sleeping for input from controlling tty.
 */
ptsstart(tp)
	struct tty *tp;
{
	register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];

	if (tp->t_state & TS_TTSTOP)
		return;
	if (pti->pt_flags & PF_STOPPED) {
		pti->pt_flags &= ~PF_STOPPED;
		pti->pt_send = TIOCPKT_START;
	}
	ptcwakeup(tp, FREAD);
}

ptcwakeup(tp, flag)
	struct tty *tp;
{
	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];

	if (flag & FREAD) {
		if (pti->pt_selr) {
			selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL);
			pti->pt_selr = 0;
			pti->pt_flags &= ~PF_RCOLL;
		}
		wakeup((caddr_t)&tp->t_outq.c_cf);
	}
	if (flag & FWRITE) {
		if (pti->pt_selw) {
			selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
			pti->pt_selw = 0;
			pti->pt_flags &= ~PF_WCOLL;
		}
		wakeup((caddr_t)&tp->t_rawq.c_cf);
	}
}

/*ARGSUSED*/
ptcopen(dev, flag)
	dev_t dev;
	int flag;
{
	register struct tty *tp;
	struct pt_ioctl *pti;

	if (minor(dev) >= NPTY)
		return (ENXIO);
	tp = &pt_tty[minor(dev)];
	if (tp->t_oproc)
		return (EIO);
	tp->t_oproc = ptsstart;
	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
	pti = &pt_ioctl[minor(dev)];
	pti->pt_flags = 0;
	pti->pt_send = 0;
	pti->pt_ucntl = 0;
	return (0);
}

ptcclose(dev)
	dev_t dev;
{
	register struct tty *tp;

	tp = &pt_tty[minor(dev)];
	(void)(*linesw[tp->t_line].l_modem)(tp, 0);
	tp->t_state &= ~TS_CARR_ON;
	tp->t_oproc = 0;		/* mark closed */
	return (0);
}

ptcread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	char buf[BUFSIZ];
	int error = 0, cc;

	/*
	 * We want to block until the slave
	 * is open, and there's something to read;
	 * but if we lost the slave or we're NBIO,
	 * then return the appropriate error instead.
	 */
	for (;;) {
		if (tp->t_state&TS_ISOPEN) {
			if (pti->pt_flags&PF_PKT && pti->pt_send) {
				error = ureadc((int)pti->pt_send, uio);
				if (error)
					return (error);
				pti->pt_send = 0;
				return (0);
			}
			if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
				error = ureadc((int)pti->pt_ucntl, uio);
				if (error)
					return (error);
				pti->pt_ucntl = 0;
				return (0);
			}
			if (pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc) {
				if (uio->uio_resid < pti->pt_ioc.c_cc + 1)
					return (E2BIG);
				error = ureadc(TIOCPKT_TIOC, uio);
				while (error == 0 && pti->pt_ioc.c_cc > 0) {
					cc = q_to_b(&pti->pt_ioc, buf,
					    MIN(pti->pt_ioc.c_cc, BUFSIZ));
					if (cc <= 0)	/* impossible? */
						break;
					error = uiomove(buf, cc, UIO_READ, uio);
				}
				return (error);
			}
			if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
				break;
		}
		if ((tp->t_state&TS_CARR_ON) == 0)
			return (EIO);
		if (pti->pt_flags&PF_NBIO)
			return (EWOULDBLOCK);
		sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
	}
	if (pti->pt_flags & (PF_PKT|PF_UCNTL|PF_TIOC))
		error = ureadc(0, uio);
	while (uio->uio_resid > 0 && error == 0) {
		cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
		if (cc <= 0)
			break;
		error = uiomove(buf, cc, UIO_READ, uio);
	}
	if (tp->t_outq.c_cc <= TTLOWAT(tp) && !(pti->pt_flags & PF_BLOCK))
		ptswake(tp);
	return (error);
}

ptswake(tp)
	register struct tty *tp;
{
	if (tp->t_state&TS_ASLEEP) {
		tp->t_state &= ~TS_ASLEEP;
		wakeup((caddr_t)&tp->t_outq);
	}
	if (tp->t_wsel) {
		selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
		tp->t_wsel = 0;
		tp->t_state &= ~TS_WCOLL;
	}
}

ptsstop(tp, flush)
	register struct tty *tp;
	int flush;
{
	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	int flag;

	/* note: FLUSHREAD and FLUSHWRITE already ok */
	if (flush == 0) {
		flush = TIOCPKT_STOP;
		pti->pt_flags |= PF_STOPPED;
	} else
		pti->pt_flags &= ~PF_STOPPED;
	pti->pt_send |= flush;
	/* change of perspective */
	flag = 0;
	if (flush & FREAD)
		flag |= FWRITE;
	if (flush & FWRITE)
		flag |= FREAD;
	ptcwakeup(tp, flag);
}

ptcselect(dev, rw)
	dev_t dev;
	int rw;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	struct proc *p;
	int s;

	if ((tp->t_state&TS_CARR_ON) == 0)
		return (1);
	switch (rw) {

	case FREAD:
		/*
		 * Need to block timeouts (ttrstart).
		 */
		s = spltty();
		if ((tp->t_state&TS_ISOPEN) &&
		     tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
			splx(s);
			return (1);
		}
		splx(s);
		/* FALLTHROUGH */

	case 0:					/* exceptional */
		if ((tp->t_state&TS_ISOPEN) &&
		    (pti->pt_flags&PF_PKT && pti->pt_send ||
		     pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc ||
		     pti->pt_flags&PF_UCNTL && pti->pt_ucntl))
			return (1);
		if ((p = pti->pt_selr) && p->p_wchan == (caddr_t)&selwait)
			pti->pt_flags |= PF_RCOLL;
		else
			pti->pt_selr = u.u_procp;
		break;


	case FWRITE:
		if (tp->t_state&TS_ISOPEN) {
			if (pti->pt_flags & PF_REMOTE) {
			    if (tp->t_canq.c_cc == 0)
				return (1);
			} else {
			    if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
				    return (1);
			    if (tp->t_canq.c_cc == 0 &&
			        (tp->t_flags & (RAW|CBREAK)) == 0)
				    return (1);
			}
		}
		if ((p = pti->pt_selw) && p->p_wchan == (caddr_t)&selwait)
			pti->pt_flags |= PF_WCOLL;
		else
			pti->pt_selw = u.u_procp;
		break;

	}
	return (0);
}

ptcwrite(dev, uio)
	dev_t dev;
	register struct uio *uio;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	register struct iovec *iov;
	register char *cp;
	register int cc = 0;
	char locbuf[BUFSIZ];
	int cnt = 0;
	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	int error = 0;

again:
	if ((tp->t_state&TS_ISOPEN) == 0)
		goto block;
	if (pti->pt_flags & PF_REMOTE) {
		if (tp->t_canq.c_cc)
			goto block;
		while (uio->uio_iovcnt > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
			iov = uio->uio_iov;
			if (iov->iov_len == 0) {
				uio->uio_iovcnt--;	
				uio->uio_iov++;
				continue;
			}
			if (cc == 0) {
				cc = MIN(iov->iov_len, BUFSIZ);
				cc = MIN(cc, TTYHOG - 1 - tp->t_canq.c_cc);
				cp = locbuf;
				error = uiomove(cp, cc, UIO_WRITE, uio);
				if (error)
					return (error);
				/* check again for safety */
				if ((tp->t_state&TS_ISOPEN) == 0)
					return (EIO);
			}
			if (cc)
				(void) b_to_q(cp, cc, &tp->t_canq);
			cc = 0;
		}
		(void) putc(0, &tp->t_canq);
		ttwakeup(tp);
		wakeup((caddr_t)&tp->t_canq);
		return (0);
	}
	while (uio->uio_iovcnt > 0) {
		iov = uio->uio_iov;
		if (cc == 0) {
			if (iov->iov_len == 0) {
				uio->uio_iovcnt--;	
				uio->uio_iov++;
				continue;
			}
			cc = MIN(iov->iov_len, BUFSIZ);
			cp = locbuf;
			error = uiomove(cp, cc, UIO_WRITE, uio);
			if (error)
				return (error);
			/* check again for safety */
			if ((tp->t_state&TS_ISOPEN) == 0)
				return (EIO);
		}
		while (cc > 0) {
			if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
			   (tp->t_canq.c_cc > 0 ||
			      tp->t_flags & (RAW|CBREAK))) {
				wakeup((caddr_t)&tp->t_rawq);
				goto block;
			}
			(*linesw[tp->t_line].l_rint)(*cp++, tp);
			cnt++;
			cc--;
		}
		cc = 0;
	}
	return (0);
block:
	/*
	 * Come here to wait for slave to open, for space
	 * in outq, or space in rawq.
	 */
	if ((tp->t_state&TS_CARR_ON) == 0)
		return (EIO);
	if (pti->pt_flags & PF_NBIO) {
		iov->iov_base -= cc;
		iov->iov_len += cc;
		uio->uio_resid += cc;
		uio->uio_offset -= cc;
		if (cnt == 0)
			return (EWOULDBLOCK);
		return (0);
	}
	sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
	goto again;
}

/*ARGSUSED*/
ptyioctl(dev, cmd, data, flag)
	caddr_t data;
	dev_t dev;
{
	register struct tty *tp = &pt_tty[minor(dev)];
	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	int stop, error;
	extern ttyinput();

	/*
	 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
	 * ttywflush(tp) will hang if there are characters in the outq.
	 */
	if (cdevsw[major(dev)].d_open == ptcopen) {
		if ((cmd & 0xffff) == (TIOCIOANS(0) & 0xffff)) {
			if (!(pti->pt_flags & PF_LIOC) || pti->pt_ioc.c_cc)
				return (EINVAL);
			(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
			wakeup((caddr_t)&pti->pt_ioc);
			return (0);
		}
		switch (cmd) {

		case TIOCPKT:
			if (*(int *)data) {
				if (pti->pt_flags & PF_UCNTL)
					return (EINVAL);
				pti->pt_flags |= PF_PKT;
			} else
				pti->pt_flags &= ~PF_PKT;
			return (0);

		case TIOCUCNTL:
			if (*(int *)data) {
				if (pti->pt_flags & PF_PKT)
					return (EINVAL);
				pti->pt_flags |= PF_UCNTL;
			} else
				pti->pt_flags &= ~PF_UCNTL;
			return (0);

		case TIOCTIOC:
			if (*(int *)data) {
				if (pti->pt_flags & PF_UCNTL)
					return (EINVAL);
				pti->pt_flags |= PF_TIOC;
			} else {
				pti->pt_flags &= ~(PF_TIOC|PF_LIOC|PF_WIOC);
				while (pti->pt_ioc.c_cc)
					(void) getc(&pti->pt_ioc);
				wakeup((caddr_t)&pti->pt_ioc);
			}
			return (0);

		case TIOCBLK:
			if (*(int *)data)
				pti->pt_flags |= PF_BLOCK;
			else {
				if (pti->pt_flags & PF_OWAIT)
					wakeup((caddr_t)pti + 1);
				pti->pt_flags &= ~(PF_BLOCK|PF_OWAIT);
				ptswake(tp);
			}
			return (0);

		case TIOCREMOTE:
			if (*(int *)data)
				pti->pt_flags |= PF_REMOTE;
			else
				pti->pt_flags &= ~PF_REMOTE;
			ttyflush(tp, FREAD|FWRITE);
			return (0);

		case FIONBIO:
			if (*(int *)data)
				pti->pt_flags |= PF_NBIO;
			else
				pti->pt_flags &= ~PF_NBIO;
			return (0);

		case FIONREAD:
			*(int *)data = tp->t_outq.c_cc;
			return (0);

		case TIOCSETP:
		case TIOCSETN:
		case TIOCSETD:
			while (getc(&tp->t_outq) >= 0)
				;
			break;
		}
	} else if (pti->pt_flags & PF_TIOC) {
		while (pti->pt_flags & PF_LIOC) {
			pti->pt_flags |= PF_WIOC;
			switch (tsleep((caddr_t)&pti->pt_flags,TTIPRI-1,5*hz)) {
			case TS_OK:
				continue;
			case TS_SIG:
			case TS_TIME:
				return (EBUSY);
			}
		}
		pti->pt_flags |= PF_LIOC | PF_BLOCK;
		while (pti->pt_ioc.c_cc)
			(void) getc(&pti->pt_ioc);
		(void) b_to_q(&cmd, sizeof cmd, &pti->pt_ioc);
		if (cmd & IOC_IN)
			(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
		ptcwakeup(tp, FREAD);
		switch (tsleep((caddr_t)&pti->pt_ioc, TTIPRI-1, 5*hz)) {
		case TS_SIG:
		case TS_TIME:
			while (pti->pt_ioc.c_cc)
				(void) getc(&pti->pt_ioc);
			if (pti->pt_flags & PF_WIOC)
				wakeup((caddr_t)&pti->pt_flags);
			if (pti->pt_flags & PF_OWAIT)
				wakeup((caddr_t)pti + 1);
			pti->pt_flags &= ~(PF_LIOC|PF_WIOC|PF_BLOCK|PF_OWAIT);
			ptswake(tp);
			return (EBUSY);
		case TS_OK:
			break;
		}
		if (pti->pt_ioc.c_cc == 0) {
			if (pti->pt_flags & PF_WIOC)
				wakeup((caddr_t)&pti->pt_flags);
			if (pti->pt_flags & PF_OWAIT)
				wakeup((caddr_t)pti + 1);
			pti->pt_flags &= ~(PF_LIOC|PF_WIOC|PF_BLOCK|PF_OWAIT);
			ptswake(tp);
			goto doioctl;
		}
		if (q_to_b(&pti->pt_ioc, &error, sizeof error) != sizeof error)
			error = EINVAL;
		if (error == 0 && cmd & IOC_OUT) {
			if (IOCPARM_LEN(cmd) != pti->pt_ioc.c_cc)
				error = EINVAL;
			else
				(void) q_to_b(&pti->pt_ioc, data,
				    pti->pt_ioc.c_cc);
		}
		while (pti->pt_ioc.c_cc)
			(void) getc(&pti->pt_ioc);
		if (pti->pt_flags & PF_WIOC)
			wakeup((caddr_t)&pti->pt_flags);
		if (pti->pt_flags & PF_OWAIT)
			wakeup((caddr_t)pti + 1);
		pti->pt_flags &= ~(PF_LIOC|PF_WIOC|PF_BLOCK|PF_OWAIT);
		ptswake(tp);
		return (error);
	}

 doioctl:
	error = ttioctl(tp, cmd, data, flag);
	/*
	 * Since we use the tty queues internally,
	 * pty's can't be switched to disciplines which overwrite
	 * the queues.  We can't tell anything about the discipline
	 * from here...
	 *
	 * Nb: this is not really good enough, the line disc open routine
	 * may have done anything at all, no guarantees that close
	 * will fix it.  This also has the effect of losing the
	 * previous discipline, which an error on a TIOCSETD shouldn't
	 * do...  Sometime it should be done via an explicit check
	 * for TIOCSETD, then check to see what linesw[new_number].l_rint
	 * really is.
	 */
	if (linesw[tp->t_line].l_rint != ttyinput) {
		(*linesw[tp->t_line].l_close)(tp);
		tp->t_line = 0;
		(void)(*linesw[tp->t_line].l_open)(dev, tp);
		error = ENOTTY;
	}

	if (error < 0) {
		if (pti->pt_flags & PF_UCNTL &&
		    (cmd & ~0xff) == UIOCCMD(0)) {
			if (cmd & 0xff) {
				pti->pt_ucntl = (u_char)cmd;
				ptcwakeup(tp, FREAD);
			}
			return (0);
		}
		error = ENOTTY;
	}
	stop = (tp->t_flags & RAW) == 0 &&
	    tp->t_stopc == CTRL('s') && tp->t_startc == CTRL('q');
	if (pti->pt_flags & PF_NOSTOP) {
		if (stop) {
			pti->pt_send &= ~TIOCPKT_NOSTOP;
			pti->pt_send |= TIOCPKT_DOSTOP;
			pti->pt_flags &= ~PF_NOSTOP;
			ptcwakeup(tp, FREAD);
		}
	} else {
		if (!stop) {
			pti->pt_send &= ~TIOCPKT_DOSTOP;
			pti->pt_send |= TIOCPKT_NOSTOP;
			pti->pt_flags |= PF_NOSTOP;
			ptcwakeup(tp, FREAD);
		}
	}
	return (error);
}
#endif
Commit	Line	Data
da7c5cc6	1	/*
0880b18e	2	* Copyright (c) 1982, 1986 Regents of the University of California.
da7c5cc6 KM	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
6a5ca8a0	6	* @(#)tty_pty.c 7.3.1.1 (Berkeley) %G%
da7c5cc6	7	*/
be4367b3	8
45372428 MT	9	/*
	10	* Pseudo-teletype Driver
	11	* (Actually two drivers, requiring two entries in 'cdevsw')
45372428	12	*/
647d645f MT	13	#include "pty.h"
647d645f MT	14
f12183e4	15	#if NPTY > 0
94368568 JB	16	#include "param.h"
	17	#include "systm.h"
	18	#include "ioctl.h"
	19	#include "tty.h"
	20	#include "dir.h"
	21	#include "user.h"
	22	#include "conf.h"
	23	#include "file.h"
	24	#include "proc.h"
	25	#include "uio.h"
	26	#include "kernel.h"
6a5ca8a0	27	#include "tsleep.h"
941944c9	28
b3c8737d	29	#if NPTY == 1
5bb90914	30	#undef NPTY
c91c01fe	31	#define NPTY 32 /* crude XXX */
b3c8737d	32	#endif
45372428	33
2bb0bef9	34	#define BUFSIZ 100 /* Chunk size iomoved to/from user */
e1d74936	35
45372428	36	/*
5bb90914 JB	37	* pts == /dev/tty[pqrs]?
5bb90914 JB	38	* ptc == /dev/pty[pqrs]?
45372428	39	*/
e1d74936 BJ	40	struct tty pt_tty[NPTY];
e1d74936 BJ	41	struct pt_ioctl {
1a954a11	42	int pt_flags;
1a954a11	43	struct proc pt_selr, pt_selw;
5bb90914 JB	44	u_char pt_send;
5bb90914 JB	45	u_char pt_ucntl;
6a5ca8a0	46	struct clist pt_ioc;
e1d74936	47	} pt_ioctl[NPTY];
5bb90914	48	int npty = NPTY; /* for pstat -t */
45372428	49
6a5ca8a0 KM	50	#define PF_RCOLL 0x0001
	51	#define PF_WCOLL 0x0002
	52	#define PF_NBIO 0x0004
	53	#define PF_PKT 0x0008 /* packet mode */
	54	#define PF_STOPPED 0x0010 /* user told stopped */
	55	#define PF_REMOTE 0x0020 /* remote and flow controlled input */
	56	#define PF_NOSTOP 0x0040
	57	#define PF_UCNTL 0x0080 /* user control mode */
	58	#define PF_TIOC 0x0100 /* transparent control mode */
	59	#define PF_LIOC 0x0200 /* transparent control locked */
	60	#define PF_WIOC 0x0400 /* waiting for PF_LIOC to clear */
	61	#define PF_BLOCK 0x0800 /* block writes to slave */
	62	#define PF_OWAIT 0x1000 /* waiting for PF_BLOCK to clear */
45372428 MT	63
	64	/ARGSUSED/
	65	ptsopen(dev, flag)
73c77d38	66	dev_t dev;
e1d74936	67	{
45372428	68	register struct tty *tp;
5bb90914	69	int error;
45372428	70
5bb90914 JB	71	#ifdef lint
	72	npty = npty;
	73	#endif
f21c8fb8 BJ	74	if (minor(dev) >= NPTY)
f21c8fb8 BJ	75	return (ENXIO);
45372428	76	tp = &pt_tty[minor(dev)];
941944c9	77	if ((tp->t_state & TS_ISOPEN) == 0) {
bdda6b91	78	ttychars(tp); /* Set up default chars */
d2f24af0	79	tp->t_ispeed = tp->t_ospeed = EXTB;
bdda6b91	80	tp->t_flags = 0; /* No features (nor raw mode) */
f21c8fb8 BJ	81	} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0)
f21c8fb8 BJ	82	return (EBUSY);
e1d74936	83	if (tp->t_oproc) /* Ctrlr still around. */
941944c9 BJ	84	tp->t_state \|= TS_CARR_ON;
	85	while ((tp->t_state & TS_CARR_ON) == 0) {
	86	tp->t_state \|= TS_WOPEN;
45372428 MT	87	sleep((caddr_t)&tp->t_rawq, TTIPRI);
45372428 MT	88	}
5bb90914 JB	89	error = (*linesw[tp->t_line].l_open)(dev, tp);
	90	ptcwakeup(tp, FREAD\|FWRITE);
	91	return (error);
45372428 MT	92	}
	93
	94	ptsclose(dev)
73c77d38	95	dev_t dev;
941944c9	96	{
45372428 MT	97	register struct tty *tp;
	98
	99	tp = &pt_tty[minor(dev)];
	100	(*linesw[tp->t_line].l_close)(tp);
4b39cb77	101	ttyclose(tp);
5bb90914	102	ptcwakeup(tp, FREAD\|FWRITE);
6a5ca8a0	103	return (0);
45372428 MT	104	}
45372428 MT	105
ae9a0a69	106	ptsread(dev, uio)
73c77d38	107	dev_t dev;
ae9a0a69	108	struct uio *uio;
e1d74936	109	{
defdbcd1 BJ	110	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1 BJ	111	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	112	int error = 0;
defdbcd1 BJ	113
	114	again:
	115	if (pti->pt_flags & PF_REMOTE) {
	116	while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
5bb90914 JB	117	if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) \|\|
5bb90914 JB	118	(u.u_procp->p_sigmask & sigmask(SIGTTIN)) \|\|
defdbcd1	119	u.u_procp->p_flag&SVFORK)
840510a3	120	return (EIO);
defdbcd1 BJ	121	gsignal(u.u_procp->p_pgrp, SIGTTIN);
defdbcd1 BJ	122	sleep((caddr_t)&lbolt, TTIPRI);
941944c9	123	}
5bb90914	124	if (tp->t_canq.c_cc == 0) {
840510a3 BJ	125	if (tp->t_state & TS_NBIO)
840510a3 BJ	126	return (EWOULDBLOCK);
5bb90914	127	sleep((caddr_t)&tp->t_canq, TTIPRI);
defdbcd1 BJ	128	goto again;
defdbcd1 BJ	129	}
5bb90914 JB	130	while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
5bb90914 JB	131	if (ureadc(getc(&tp->t_canq), uio) < 0) {
840510a3	132	error = EFAULT;
ae9a0a69 BJ	133	break;
ae9a0a69 BJ	134	}
5bb90914 JB	135	if (tp->t_canq.c_cc == 1)
	136	(void) getc(&tp->t_canq);
	137	if (tp->t_canq.c_cc)
840510a3	138	return (error);
defdbcd1 BJ	139	} else
defdbcd1 BJ	140	if (tp->t_oproc)
840510a3	141	error = (*linesw[tp->t_line].l_read)(tp, uio);
5bb90914	142	ptcwakeup(tp, FWRITE);
840510a3	143	return (error);
45372428 MT	144	}
45372428 MT	145
941944c9 BJ	146	/*
	147	* Write to pseudo-tty.
	148	* Wakeups of controlling tty will happen
	149	* indirectly, when tty driver calls ptsstart.
	150	*/
ae9a0a69	151	ptswrite(dev, uio)
73c77d38	152	dev_t dev;
ae9a0a69	153	struct uio *uio;
e1d74936	154	{
6a5ca8a0 KM	155	register struct tty *tp = &pt_tty[minor(dev)];
6a5ca8a0 KM	156	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
45372428	157
840510a3 BJ	158	if (tp->t_oproc == 0)
840510a3 BJ	159	return (EIO);
6a5ca8a0 KM	160
	161	while (pti->pt_flags & PF_BLOCK) {
	162	pti->pt_flags \|= PF_OWAIT;
	163	sleep((caddr_t)pti + 1, TTOPRI);
	164	}
	165
840510a3	166	return ((*linesw[tp->t_line].l_write)(tp, uio));
45372428 MT	167	}
45372428 MT	168
941944c9 BJ	169	/*
	170	* Start output on pseudo-tty.
	171	* Wake up process selecting or sleeping for input from controlling tty.
	172	*/
45372428	173	ptsstart(tp)
e1d74936 BJ	174	struct tty *tp;
e1d74936 BJ	175	{
1e6d24b1	176	register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
e1d74936	177
941944c9	178	if (tp->t_state & TS_TTSTOP)
45372428	179	return;
1e6d24b1 BJ	180	if (pti->pt_flags & PF_STOPPED) {
	181	pti->pt_flags &= ~PF_STOPPED;
	182	pti->pt_send = TIOCPKT_START;
	183	}
5bb90914	184	ptcwakeup(tp, FREAD);
d427b3b2 BJ	185	}
d427b3b2 BJ	186
5bb90914	187	ptcwakeup(tp, flag)
d427b3b2 BJ	188	struct tty *tp;
	189	{
	190	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	191
5bb90914 JB	192	if (flag & FREAD) {
	193	if (pti->pt_selr) {
	194	selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL);
	195	pti->pt_selr = 0;
	196	pti->pt_flags &= ~PF_RCOLL;
	197	}
	198	wakeup((caddr_t)&tp->t_outq.c_cf);
	199	}
	200	if (flag & FWRITE) {
	201	if (pti->pt_selw) {
	202	selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
	203	pti->pt_selw = 0;
	204	pti->pt_flags &= ~PF_WCOLL;
	205	}
	206	wakeup((caddr_t)&tp->t_rawq.c_cf);
e1d74936	207	}
45372428 MT	208	}
	209
	210	/ARGSUSED/
	211	ptcopen(dev, flag)
e1d74936 BJ	212	dev_t dev;
	213	int flag;
	214	{
45372428	215	register struct tty *tp;
1a954a11	216	struct pt_ioctl *pti;
45372428	217
f21c8fb8 BJ	218	if (minor(dev) >= NPTY)
f21c8fb8 BJ	219	return (ENXIO);
45372428	220	tp = &pt_tty[minor(dev)];
f21c8fb8 BJ	221	if (tp->t_oproc)
f21c8fb8 BJ	222	return (EIO);
e1d74936	223	tp->t_oproc = ptsstart;
f2f3b49b	224	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
1a954a11 BJ	225	pti = &pt_ioctl[minor(dev)];
	226	pti->pt_flags = 0;
	227	pti->pt_send = 0;
5bb90914	228	pti->pt_ucntl = 0;
f21c8fb8	229	return (0);
45372428 MT	230	}
	231
	232	ptcclose(dev)
e1d74936 BJ	233	dev_t dev;
e1d74936 BJ	234	{
45372428 MT	235	register struct tty *tp;
	236
	237	tp = &pt_tty[minor(dev)];
f2f3b49b	238	(void)(*linesw[tp->t_line].l_modem)(tp, 0);
d3be7d55	239	tp->t_state &= ~TS_CARR_ON;
e1d74936	240	tp->t_oproc = 0; /* mark closed */
6a5ca8a0	241	return (0);
45372428 MT	242	}
45372428 MT	243
ae9a0a69	244	ptcread(dev, uio)
1a954a11	245	dev_t dev;
ae9a0a69	246	struct uio *uio;
e1d74936	247	{
840510a3	248	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914	249	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
2bb0bef9 SL	250	char buf[BUFSIZ];
2bb0bef9 SL	251	int error = 0, cc;
45372428	252
5bb90914 JB	253	/*
	254	* We want to block until the slave
	255	* is open, and there's something to read;
	256	* but if we lost the slave or we're NBIO,
	257	* then return the appropriate error instead.
	258	*/
	259	for (;;) {
	260	if (tp->t_state&TS_ISOPEN) {
	261	if (pti->pt_flags&PF_PKT && pti->pt_send) {
8011f5df	262	error = ureadc((int)pti->pt_send, uio);
5bb90914 JB	263	if (error)
	264	return (error);
	265	pti->pt_send = 0;
	266	return (0);
	267	}
	268	if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
8011f5df	269	error = ureadc((int)pti->pt_ucntl, uio);
5bb90914 JB	270	if (error)
	271	return (error);
	272	pti->pt_ucntl = 0;
	273	return (0);
	274	}
6a5ca8a0 KM	275	if (pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc) {
	276	if (uio->uio_resid < pti->pt_ioc.c_cc + 1)
	277	return (E2BIG);
	278	error = ureadc(TIOCPKT_TIOC, uio);
	279	while (error == 0 && pti->pt_ioc.c_cc > 0) {
	280	cc = q_to_b(&pti->pt_ioc, buf,
	281	MIN(pti->pt_ioc.c_cc, BUFSIZ));
	282	if (cc <= 0) /* impossible? */
	283	break;
	284	error = uiomove(buf, cc, UIO_READ, uio);
	285	}
	286	return (error);
	287	}
5bb90914 JB	288	if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
5bb90914 JB	289	break;
1a954a11	290	}
2bb0bef9 SL	291	if ((tp->t_state&TS_CARR_ON) == 0)
2bb0bef9 SL	292	return (EIO);
840510a3 BJ	293	if (pti->pt_flags&PF_NBIO)
840510a3 BJ	294	return (EWOULDBLOCK);
45372428	295	sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
8b8271ac	296	}
6a5ca8a0	297	if (pti->pt_flags & (PF_PKT\|PF_UCNTL\|PF_TIOC))
5bb90914	298	error = ureadc(0, uio);
2bb0bef9 SL	299	while (uio->uio_resid > 0 && error == 0) {
	300	cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
	301	if (cc <= 0)
ae9a0a69	302	break;
2bb0bef9 SL	303	error = uiomove(buf, cc, UIO_READ, uio);
2bb0bef9 SL	304	}
6a5ca8a0 KM	305	if (tp->t_outq.c_cc <= TTLOWAT(tp) && !(pti->pt_flags & PF_BLOCK))
6a5ca8a0 KM	306	ptswake(tp);
840510a3	307	return (error);
45372428 MT	308	}
45372428 MT	309
6a5ca8a0 KM	310	ptswake(tp)
	311	register struct tty *tp;
	312	{
	313	if (tp->t_state&TS_ASLEEP) {
	314	tp->t_state &= ~TS_ASLEEP;
	315	wakeup((caddr_t)&tp->t_outq);
	316	}
	317	if (tp->t_wsel) {
	318	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
	319	tp->t_wsel = 0;
	320	tp->t_state &= ~TS_WCOLL;
	321	}
	322	}
	323
1a954a11 BJ	324	ptsstop(tp, flush)
	325	register struct tty *tp;
	326	int flush;
	327	{
	328	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
5bb90914	329	int flag;
1a954a11	330
1e6d24b1 BJ	331	/* note: FLUSHREAD and FLUSHWRITE already ok */
	332	if (flush == 0) {
	333	flush = TIOCPKT_STOP;
	334	pti->pt_flags \|= PF_STOPPED;
5bb90914	335	} else
1e6d24b1	336	pti->pt_flags &= ~PF_STOPPED;
0a2bd708	337	pti->pt_send \|= flush;
5bb90914 JB	338	/* change of perspective */
	339	flag = 0;
	340	if (flush & FREAD)
	341	flag \|= FWRITE;
	342	if (flush & FWRITE)
	343	flag \|= FREAD;
9d2a90b1	344	ptcwakeup(tp, flag);
1a954a11 BJ	345	}
1a954a11 BJ	346
941944c9	347	ptcselect(dev, rw)
e1d74936	348	dev_t dev;
941944c9	349	int rw;
e1d74936 BJ	350	{
e1d74936 BJ	351	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1	352	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
e1d74936	353	struct proc *p;
d427b3b2	354	int s;
e1d74936	355
5bb90914	356	if ((tp->t_state&TS_CARR_ON) == 0)
e1d74936	357	return (1);
941944c9 BJ	358	switch (rw) {
	359
	360	case FREAD:
892f2f35 MK	361	/*
	362	* Need to block timeouts (ttrstart).
	363	*/
	364	s = spltty();
7cbd29e4 MK	365	if ((tp->t_state&TS_ISOPEN) &&
	366	tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
	367	splx(s);
	368	return (1);
	369	}
892f2f35	370	splx(s);
7cbd29e4 MK	371	/* FALLTHROUGH */
	372
	373	case 0: /* exceptional */
5bb90914 JB	374	if ((tp->t_state&TS_ISOPEN) &&
5bb90914 JB	375	(pti->pt_flags&PF_PKT && pti->pt_send \|\|
6a5ca8a0	376	pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc \|\|
892f2f35	377	pti->pt_flags&PF_UCNTL && pti->pt_ucntl))
941944c9	378	return (1);
1a954a11 BJ	379	if ((p = pti->pt_selr) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	380	pti->pt_flags \|= PF_RCOLL;
941944c9	381	else
1a954a11	382	pti->pt_selr = u.u_procp;
d427b3b2	383	break;
941944c9	384
7cbd29e4	385
941944c9	386	case FWRITE:
892f2f35 MK	387	if (tp->t_state&TS_ISOPEN) {
	388	if (pti->pt_flags & PF_REMOTE) {
	389	if (tp->t_canq.c_cc == 0)
	390	return (1);
	391	} else {
	392	if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
	393	return (1);
	394	if (tp->t_canq.c_cc == 0 &&
aec7dd3b	395	(tp->t_flags & (RAW\|CBREAK)) == 0)
892f2f35 MK	396	return (1);
892f2f35 MK	397	}
d427b3b2	398	}
1a954a11 BJ	399	if ((p = pti->pt_selw) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	400	pti->pt_flags \|= PF_WCOLL;
941944c9	401	else
1a954a11	402	pti->pt_selw = u.u_procp;
d427b3b2	403	break;
7cbd29e4	404
941944c9	405	}
d427b3b2	406	return (0);
e1d74936 BJ	407	}
e1d74936 BJ	408
ae9a0a69	409	ptcwrite(dev, uio)
941944c9	410	dev_t dev;
5bb90914	411	register struct uio *uio;
e1d74936	412	{
840510a3	413	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914 JB	414	register struct iovec *iov;
	415	register char *cp;
	416	register int cc = 0;
45372428	417	char locbuf[BUFSIZ];
941944c9	418	int cnt = 0;
defdbcd1	419	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	420	int error = 0;
45372428	421
defdbcd1	422	again:
5bb90914 JB	423	if ((tp->t_state&TS_ISOPEN) == 0)
5bb90914 JB	424	goto block;
9d2a90b1	425	if (pti->pt_flags & PF_REMOTE) {
5bb90914 JB	426	if (tp->t_canq.c_cc)
5bb90914 JB	427	goto block;
9d2a90b1 JB	428	while (uio->uio_iovcnt > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
	429	iov = uio->uio_iov;
	430	if (iov->iov_len == 0) {
	431	uio->uio_iovcnt--;
	432	uio->uio_iov++;
	433	continue;
	434	}
	435	if (cc == 0) {
	436	cc = MIN(iov->iov_len, BUFSIZ);
	437	cc = MIN(cc, TTYHOG - 1 - tp->t_canq.c_cc);
	438	cp = locbuf;
	439	error = uiomove(cp, cc, UIO_WRITE, uio);
	440	if (error)
	441	return (error);
	442	/* check again for safety */
	443	if ((tp->t_state&TS_ISOPEN) == 0)
	444	return (EIO);
	445	}
	446	if (cc)
	447	(void) b_to_q(cp, cc, &tp->t_canq);
	448	cc = 0;
defdbcd1	449	}
5bb90914 JB	450	(void) putc(0, &tp->t_canq);
	451	ttwakeup(tp);
	452	wakeup((caddr_t)&tp->t_canq);
	453	return (0);
	454	}
	455	while (uio->uio_iovcnt > 0) {
	456	iov = uio->uio_iov;
	457	if (cc == 0) {
	458	if (iov->iov_len == 0) {
	459	uio->uio_iovcnt--;
	460	uio->uio_iov++;
	461	continue;
45372428	462	}
5bb90914 JB	463	cc = MIN(iov->iov_len, BUFSIZ);
	464	cp = locbuf;
	465	error = uiomove(cp, cc, UIO_WRITE, uio);
	466	if (error)
	467	return (error);
	468	/* check again for safety */
	469	if ((tp->t_state&TS_ISOPEN) == 0)
	470	return (EIO);
	471	}
9d2a90b1 JB	472	while (cc > 0) {
9d2a90b1 JB	473	if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
892f2f35 MK	474	(tp->t_canq.c_cc > 0 \|\|
892f2f35 MK	475	tp->t_flags & (RAW\|CBREAK))) {
9d2a90b1 JB	476	wakeup((caddr_t)&tp->t_rawq);
	477	goto block;
	478	}
36612a8f	479	(linesw[tp->t_line].l_rint)(cp++, tp);
941944c9	480	cnt++;
9d2a90b1	481	cc--;
45372428	482	}
5bb90914 JB	483	cc = 0;
	484	}
	485	return (0);
	486	block:
	487	/*
9d2a90b1 JB	488	* Come here to wait for slave to open, for space
9d2a90b1 JB	489	* in outq, or space in rawq.
5bb90914 JB	490	*/
	491	if ((tp->t_state&TS_CARR_ON) == 0)
	492	return (EIO);
	493	if (pti->pt_flags & PF_NBIO) {
5bb90914 JB	494	iov->iov_base -= cc;
	495	iov->iov_len += cc;
	496	uio->uio_resid += cc;
	497	uio->uio_offset -= cc;
9d2a90b1 JB	498	if (cnt == 0)
9d2a90b1 JB	499	return (EWOULDBLOCK);
5bb90914 JB	500	return (0);
	501	}
	502	sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
	503	goto again;
45372428 MT	504	}
45372428 MT	505
45372428	506	/ARGSUSED/
4b72e2f9 SL	507	ptyioctl(dev, cmd, data, flag)
4b72e2f9 SL	508	caddr_t data;
e1d74936 BJ	509	dev_t dev;
e1d74936 BJ	510	{
0a2bd708 BJ	511	register struct tty *tp = &pt_tty[minor(dev)];
0a2bd708 BJ	512	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
5bb90914	513	int stop, error;
f2f3b49b	514	extern ttyinput();
45372428	515
f2f3b49b MK	516	/*
	517	* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
	518	* ttywflush(tp) will hang if there are characters in the outq.
	519	*/
6a5ca8a0 KM	520	if (cdevsw[major(dev)].d_open == ptcopen) {
	521	if ((cmd & 0xffff) == (TIOCIOANS(0) & 0xffff)) {
	522	if (!(pti->pt_flags & PF_LIOC) \|\| pti->pt_ioc.c_cc)
	523	return (EINVAL);
	524	(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
	525	wakeup((caddr_t)&pti->pt_ioc);
	526	return (0);
	527	}
4b72e2f9 SL	528	switch (cmd) {
	529
	530	case TIOCPKT:
5bb90914 JB	531	if ((int )data) {
	532	if (pti->pt_flags & PF_UCNTL)
	533	return (EINVAL);
1a954a11	534	pti->pt_flags \|= PF_PKT;
5bb90914	535	} else
1a954a11	536	pti->pt_flags &= ~PF_PKT;
f21c8fb8	537	return (0);
4b72e2f9	538
5bb90914 JB	539	case TIOCUCNTL:
	540	if ((int )data) {
	541	if (pti->pt_flags & PF_PKT)
	542	return (EINVAL);
	543	pti->pt_flags \|= PF_UCNTL;
	544	} else
	545	pti->pt_flags &= ~PF_UCNTL;
	546	return (0);
	547
6a5ca8a0 KM	548	case TIOCTIOC:
	549	if ((int )data) {
	550	if (pti->pt_flags & PF_UCNTL)
	551	return (EINVAL);
	552	pti->pt_flags \|= PF_TIOC;
	553	} else {
	554	pti->pt_flags &= ~(PF_TIOC\|PF_LIOC\|PF_WIOC);
	555	while (pti->pt_ioc.c_cc)
	556	(void) getc(&pti->pt_ioc);
	557	wakeup((caddr_t)&pti->pt_ioc);
	558	}
	559	return (0);
	560
	561	case TIOCBLK:
	562	if ((int )data)
	563	pti->pt_flags \|= PF_BLOCK;
	564	else {
	565	if (pti->pt_flags & PF_OWAIT)
	566	wakeup((caddr_t)pti + 1);
	567	pti->pt_flags &= ~(PF_BLOCK\|PF_OWAIT);
	568	ptswake(tp);
	569	}
	570	return (0);
	571
4b72e2f9 SL	572	case TIOCREMOTE:
4b72e2f9 SL	573	if ((int )data)
defdbcd1 BJ	574	pti->pt_flags \|= PF_REMOTE;
	575	else
	576	pti->pt_flags &= ~PF_REMOTE;
88a7a62a	577	ttyflush(tp, FREAD\|FWRITE);
f21c8fb8	578	return (0);
4b72e2f9 SL	579
	580	case FIONBIO:
	581	if ((int )data)
1a954a11	582	pti->pt_flags \|= PF_NBIO;
8b8271ac	583	else
1a954a11	584	pti->pt_flags &= ~PF_NBIO;
f21c8fb8	585	return (0);
4b72e2f9	586
6a5ca8a0 KM	587	case FIONREAD:
	588	(int )data = tp->t_outq.c_cc;
	589	return (0);
	590
4b72e2f9	591	case TIOCSETP:
f2f3b49b MK	592	case TIOCSETN:
f2f3b49b MK	593	case TIOCSETD:
4b72e2f9 SL	594	while (getc(&tp->t_outq) >= 0)
	595	;
	596	break;
8b8271ac	597	}
6a5ca8a0 KM	598	} else if (pti->pt_flags & PF_TIOC) {
	599	while (pti->pt_flags & PF_LIOC) {
	600	pti->pt_flags \|= PF_WIOC;
	601	switch (tsleep((caddr_t)&pti->pt_flags,TTIPRI-1,5*hz)) {
	602	case TS_OK:
	603	continue;
	604	case TS_SIG:
	605	case TS_TIME:
	606	return (EBUSY);
	607	}
	608	}
	609	pti->pt_flags \|= PF_LIOC \| PF_BLOCK;
	610	while (pti->pt_ioc.c_cc)
	611	(void) getc(&pti->pt_ioc);
	612	(void) b_to_q(&cmd, sizeof cmd, &pti->pt_ioc);
	613	if (cmd & IOC_IN)
	614	(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
	615	ptcwakeup(tp, FREAD);
	616	switch (tsleep((caddr_t)&pti->pt_ioc, TTIPRI-1, 5*hz)) {
	617	case TS_SIG:
	618	case TS_TIME:
	619	while (pti->pt_ioc.c_cc)
	620	(void) getc(&pti->pt_ioc);
	621	if (pti->pt_flags & PF_WIOC)
	622	wakeup((caddr_t)&pti->pt_flags);
	623	if (pti->pt_flags & PF_OWAIT)
	624	wakeup((caddr_t)pti + 1);
	625	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	626	ptswake(tp);
	627	return (EBUSY);
	628	case TS_OK:
	629	break;
	630	}
	631	if (pti->pt_ioc.c_cc == 0) {
	632	if (pti->pt_flags & PF_WIOC)
	633	wakeup((caddr_t)&pti->pt_flags);
	634	if (pti->pt_flags & PF_OWAIT)
	635	wakeup((caddr_t)pti + 1);
	636	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	637	ptswake(tp);
	638	goto doioctl;
	639	}
	640	if (q_to_b(&pti->pt_ioc, &error, sizeof error) != sizeof error)
	641	error = EINVAL;
	642	if (error == 0 && cmd & IOC_OUT) {
	643	if (IOCPARM_LEN(cmd) != pti->pt_ioc.c_cc)
	644	error = EINVAL;
	645	else
	646	(void) q_to_b(&pti->pt_ioc, data,
	647	pti->pt_ioc.c_cc);
	648	}
	649	while (pti->pt_ioc.c_cc)
	650	(void) getc(&pti->pt_ioc);
	651	if (pti->pt_flags & PF_WIOC)
	652	wakeup((caddr_t)&pti->pt_flags);
	653	if (pti->pt_flags & PF_OWAIT)
	654	wakeup((caddr_t)pti + 1);
	655	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	656	ptswake(tp);
	657	return (error);
	658	}
	659
	660	doioctl:
477d62ec	661	error = ttioctl(tp, cmd, data, flag);
f2f3b49b MK	662	/*
	663	* Since we use the tty queues internally,
	664	* pty's can't be switched to disciplines which overwrite
	665	* the queues. We can't tell anything about the discipline
	666	* from here...
6a5ca8a0 KM	667	*
	668	* Nb: this is not really good enough, the line disc open routine
	669	* may have done anything at all, no guarantees that close
	670	* will fix it. This also has the effect of losing the
	671	* previous discipline, which an error on a TIOCSETD shouldn't
	672	* do... Sometime it should be done via an explicit check
	673	* for TIOCSETD, then check to see what linesw[new_number].l_rint
	674	* really is.
f2f3b49b MK	675	*/
	676	if (linesw[tp->t_line].l_rint != ttyinput) {
	677	(*linesw[tp->t_line].l_close)(tp);
	678	tp->t_line = 0;
	679	(void)(*linesw[tp->t_line].l_open)(dev, tp);
	680	error = ENOTTY;
	681	}
6a5ca8a0	682
5bb90914 JB	683	if (error < 0) {
5bb90914 JB	684	if (pti->pt_flags & PF_UCNTL &&
97d7430f	685	(cmd & ~0xff) == UIOCCMD(0)) {
5bb90914 JB	686	if (cmd & 0xff) {
	687	pti->pt_ucntl = (u_char)cmd;
	688	ptcwakeup(tp, FREAD);
	689	}
	690	return (0);
	691	}
f21c8fb8	692	error = ENOTTY;
5bb90914 JB	693	}
5bb90914 JB	694	stop = (tp->t_flags & RAW) == 0 &&
c16520ef	695	tp->t_stopc == CTRL('s') && tp->t_startc == CTRL('q');
0a2bd708 BJ	696	if (pti->pt_flags & PF_NOSTOP) {
0a2bd708 BJ	697	if (stop) {
b31eb1ff	698	pti->pt_send &= ~TIOCPKT_NOSTOP;
0a2bd708 BJ	699	pti->pt_send \|= TIOCPKT_DOSTOP;
0a2bd708 BJ	700	pti->pt_flags &= ~PF_NOSTOP;
5bb90914	701	ptcwakeup(tp, FREAD);
0a2bd708 BJ	702	}
0a2bd708 BJ	703	} else {
5bb90914	704	if (!stop) {
0a2bd708 BJ	705	pti->pt_send &= ~TIOCPKT_DOSTOP;
	706	pti->pt_send \|= TIOCPKT_NOSTOP;
	707	pti->pt_flags \|= PF_NOSTOP;
5bb90914	708	ptcwakeup(tp, FREAD);
0a2bd708 BJ	709	}
0a2bd708 BJ	710	}
f21c8fb8	711	return (error);
45372428	712	}
4f07e6e5	713	#endif