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

/*
 * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)tty_pty.c	7.21 (Berkeley) 5/30/91
 *	$Id: tty_pty.c,v 1.13 1994/04/20 18:37:10 ache Exp $
 */

/*
 * 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 "conf.h"
#include "file.h"
#include "proc.h"
#include "uio.h"
#include "kernel.h"
#include "vnode.h"
#include "signalvar.h"

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

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

static void ptcwakeup(struct tty *, int);

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

#define	PF_RCOLL	0x0001
#define	PF_WCOLL	0x0002
#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_COPEN	0x0100		/* master open */
#define	PF_SOPEN	0x0200		/* slave open */

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

#ifdef lint
	npty = npty;
#endif
	if (minor(dev) >= NPTY)
		return (ENXIO);
	tp = pt_tty[minor(dev)] = ttymalloc(pt_tty[minor(dev)]);
	if ((tp->t_state & TS_ISOPEN) == 0) {
		ttychars(tp);		/* Set up default chars */
		tp->t_iflag = TTYDEF_IFLAG;
		tp->t_oflag = TTYDEF_OFLAG;
		tp->t_lflag = TTYDEF_LFLAG;
		tp->t_cflag = TTYDEF_CFLAG;
		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
		ttsetwater(tp);		/* would be done in xxparam() */
	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_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) {
		if (flag&FNONBLOCK)
			break;
		if (error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
		    "ptsopn", 0))
			return (error);
	}
	error = (*linesw[tp->t_line].l_open)(dev, tp, flag);
	if (error == 0) {
		ptcwakeup(tp, FREAD|FWRITE);
		pt_ioctl[minor(dev)].pt_flags |= PF_SOPEN;
	}
	return (error);
}

int
ptsclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	register struct tty *tp;

	tp = pt_tty[minor(dev)];
	ptcwakeup(tp, FREAD|FWRITE);
	(*linesw[tp->t_line].l_close)(tp, flag);
	ttyclose(tp);
	pt_ioctl[minor(dev)].pt_flags &= ~PF_SOPEN;
	if ((pt_ioctl[minor(dev)].pt_flags & PF_COPEN) == 0) {
		ttyfree(tp);
#ifdef broken /* session holds a ref to the tty; can't deallocate */
		pt_tty[minor(dev)] = (struct tty *)NULL;
#endif
	}
	return(0);
}

int
ptsread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;
{
	struct proc *p = curproc;
	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 (isbackground(p, tp)) {
			if ((p->p_sigignore & sigmask(SIGTTIN)) ||
			    (p->p_sigmask & sigmask(SIGTTIN)) ||
			    p->p_pgrp->pg_jobc == 0 ||
			    p->p_flag&SPPWAIT)
				return (EIO);
			pgsignal(p->p_pgrp, SIGTTIN, 1);
			if (error = ttysleep(tp, (caddr_t)&lbolt, 
			    TTIPRI | PCATCH, "ptsbg", 0))
				return (error);
		}
		if (RB_LEN(tp->t_can) == 0) {
			if (flag & IO_NDELAY)
				return (EWOULDBLOCK);
			if (error = ttysleep(tp, (caddr_t)tp->t_can,
			    TTIPRI | PCATCH, "ptsin", 0))
				return (error);
			goto again;
		}
		while (RB_LEN(tp->t_can) > 1 && uio->uio_resid > 0)
			if (ureadc(getc(tp->t_can), uio) < 0) {
				error = EFAULT;
				break;
			}
		if (RB_LEN(tp->t_can) == 1)
			(void) getc(tp->t_can);
		if (RB_LEN(tp->t_can))
			return (error);
	} else
		if (tp->t_oproc)
			error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
	ptcwakeup(tp, FWRITE);
	return (error);
}

/*
 * Write to pseudo-tty.
 * Wakeups of controlling tty will happen
 * indirectly, when tty driver calls ptsstart.
 */
int
ptswrite(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;
{
	register struct tty *tp;

	tp = pt_tty[minor(dev)];
	if (tp->t_oproc == 0)
		return (EIO);
	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}

/*
 * Start output on pseudo-tty.
 * Wake up process selecting or sleeping for input from controlling tty.
 */
void
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);
}

static void
ptcwakeup(tp, flag)
	struct tty *tp;
	int flag;
{
	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(TSA_PTC_READ(tp));
	}
	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(TSA_PTC_WRITE(tp));
	}
}

/*ARGSUSED*/
int
#ifdef __STDC__
ptcopen(int /*dev_t*/ dev, int flag, int devtype, struct proc *p)
#else
ptcopen(dev, flag, devtype, p)
	dev_t dev;
	int flag, devtype;
	struct proc *p;
#endif
{
	register struct tty *tp;
	struct pt_ioctl *pti;

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

extern struct tty *constty;	/* -hv- 06.Oct.92*/

int
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 */
	tp->t_session = 0;

	if (constty==tp)
		constty = 0;

	pt_ioctl[minor(dev)].pt_flags &= ~PF_COPEN;
	if ((pt_ioctl[minor(dev)].pt_flags & PF_SOPEN) == 0) {
		ttyfree(tp);
#ifdef broken /* session holds a ref to the tty; can't deallocate */
		pt_tty[minor(dev)] = (struct tty *)NULL;
#endif
	}
	return (0);
}

int
ptcread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;
{
	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);
				if (pti->pt_send & TIOCPKT_IOCTL) {
					cc = MIN(uio->uio_resid,
						sizeof(tp->t_termios));
					uiomove(&tp->t_termios, cc, uio);
				}
				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 (RB_LEN(tp->t_out) && (tp->t_state&TS_TTSTOP) == 0)
				break;
		}
		if ((tp->t_state&TS_CARR_ON) == 0)
			return (0);	/* EOF */
		if (flag & IO_NDELAY)
			return (EWOULDBLOCK);
		if (error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH,
		    "ptcin", 0))
			return (error);
	}
	if (pti->pt_flags & (PF_PKT|PF_UCNTL))
		error = ureadc(0, uio);
	while (uio->uio_resid > 0 && error == 0) {
#ifdef was
		cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
#else
		cc = min(MIN(uio->uio_resid, BUFSIZ), RB_CONTIGGET(tp->t_out));
		if (cc) {
			bcopy(tp->t_out->rb_hd, buf, cc);
			tp->t_out->rb_hd =
				RB_ROLLOVER(tp->t_out, tp->t_out->rb_hd+cc);
		}
#endif
		if (cc <= 0)
			break;
		error = uiomove(buf, cc, uio);
	}
	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
		ttwwakeup(tp);
	return (error);
}

void
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);
}

int
ptcselect(dev, rw, p)
	dev_t dev;
	int rw;
	struct proc *p;
{
	register struct tty *tp = pt_tty[minor(dev)];
	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	struct proc *prev;
	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) &&
		     RB_LEN(tp->t_out) && (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_UCNTL && pti->pt_ucntl))
			return (1);
		if (pti->pt_selr && (prev = pfind(pti->pt_selr)) && prev->p_wchan == (caddr_t)&selwait)
			pti->pt_flags |= PF_RCOLL;
		else
			pti->pt_selr = p->p_pid;
		break;


	case FWRITE:
		if (tp->t_state&TS_ISOPEN) {
			if (pti->pt_flags & PF_REMOTE) {
			    if (RB_LEN(tp->t_can) == 0)
				return (1);
			} else {
			    if (RB_LEN(tp->t_raw) + RB_LEN(tp->t_can) < TTYHOG-2)
				    return (1);
			    if (RB_LEN(tp->t_can) == 0 && (tp->t_iflag&ICANON))
				    return (1);
			}
		}
		if (pti->pt_selw && (prev = pfind(pti->pt_selw)) && prev->p_wchan == (caddr_t)&selwait)
			pti->pt_flags |= PF_WCOLL;
		else
			pti->pt_selw = p->p_pid;
		break;

	}
	return (0);
}

int
ptcwrite(dev, uio, flag)
	dev_t dev;
	register struct uio *uio;
	int flag;
{
	register struct tty *tp = pt_tty[minor(dev)];
	register u_char *cp = 0;
	register int cc = 0;
	u_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 (RB_LEN(tp->t_can))
			goto block;
		while (uio->uio_resid > 0 && RB_LEN(tp->t_can) < TTYHOG - 1) {
			if (cc == 0) {
				cc = min(uio->uio_resid, BUFSIZ);
				cc = min(cc, RB_CONTIGPUT(tp->t_can));
				cp = locbuf;
				error = uiomove((caddr_t)cp, cc, uio);
				if (error)
					return (error);
				/* check again for safety */
				if ((tp->t_state&TS_ISOPEN) == 0)
					return (EIO);
			}
#ifdef was
			if (cc)
				(void) b_to_q((char *)cp, cc, &tp->t_canq);
#else
			if (cc) {
				bcopy(cp, tp->t_can->rb_tl, cc);
				tp->t_can->rb_tl =
				  RB_ROLLOVER(tp->t_can, tp->t_can->rb_tl+cc);
			}
#endif
			cc = 0;
		}
		(void) putc(0, tp->t_can);
		ttwakeup(tp);
		wakeup((caddr_t)tp->t_can);
		return (0);
	}
	while (uio->uio_resid > 0) {
		if (cc == 0) {
			cc = min(uio->uio_resid, BUFSIZ);
			cp = locbuf;
			error = uiomove((caddr_t)cp, cc, uio);
			if (error)
				return (error);
			/* check again for safety */
			if ((tp->t_state&TS_ISOPEN) == 0)
				return (EIO);
		}
		while (cc > 0) {
			if ((RB_LEN(tp->t_raw) + RB_LEN(tp->t_can)) >= TTYHOG - 2 &&
			   (RB_LEN(tp->t_can) > 0 || !(tp->t_iflag&ICANON))) {
				wakeup(TSA_HUP_OR_INPUT(tp));
				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 (flag & IO_NDELAY) {
		/* adjust for data copied in but not written */
		uio->uio_resid += cc;
		if (cnt == 0)
			return (EWOULDBLOCK);
		return (0);
	}
	if (error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH,
	    "ptcout", 0)) {
		/* adjust for data copied in but not written */
		uio->uio_resid += cc;
		return (error);
	}
	goto again;
}

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

	/*
	 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
	 * ttywflush(tp) will hang if there are characters in the outq.
	 */
	if (cmd == TIOCEXT) {
		/*
		 * When the EXTPROC bit is being toggled, we need
		 * to send an TIOCPKT_IOCTL if the packet driver
		 * is turned on.
		 */
		if (*(int *)data) {
			if (pti->pt_flags & PF_PKT) {
				pti->pt_send |= TIOCPKT_IOCTL;
				ptcwakeup(tp, FREAD);
			}
			tp->t_lflag |= EXTPROC;
		} else {
			if ((tp->t_state & EXTPROC) &&
			    (pti->pt_flags & PF_PKT)) {
				pti->pt_send |= TIOCPKT_IOCTL;
				ptcwakeup(tp, FREAD);
			}
			tp->t_lflag &= ~EXTPROC;
		}
		return(0);
	} else
	if (cdevsw[major(dev)].d_open == ptcopen)
		switch (cmd) {

		case TIOCGPGRP:
			/*
			 * We aviod calling ttioctl on the controller since,
			 * in that case, tp must be the controlling terminal.
			 */
			*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
			return (0);

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

#ifdef COMPAT_43
	/* wkt */
		case TIOCSETP:		
		case TIOCSETN:
#endif
		case TIOCSETD:
		case TIOCSETA:
		case TIOCSETAW:
		case TIOCSETAF:
			while (getc(tp->t_out) >= 0)
				;
			break;

		case TIOCSIG:
			if (*(unsigned int *)data >= NSIG)
				return(EINVAL);
			if ((tp->t_lflag&NOFLSH) == 0)
				ttyflush(tp, FREAD|FWRITE);
			pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
			if ((*(unsigned int *)data == SIGINFO) &&
			    ((tp->t_lflag&NOKERNINFO) == 0))
				ttyinfo(tp);
			return(0);
		}
	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
	if (error >= 0)
	    return (error);
	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...
	 */
	if (linesw[tp->t_line].l_rint != ttyinput) {
		(*linesw[tp->t_line].l_close)(tp, flag);
		tp->t_line = TTYDISC;
		(void)(*linesw[tp->t_line].l_open)(dev, tp, flag);
		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;
	}
	/*
	 * If external processing and packet mode send ioctl packet.
	 */
	if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
		switch(cmd) {
		case TIOCSETA:
		case TIOCSETAW:
		case TIOCSETAF:
#ifdef	COMPAT_43
	/* wkt */
		case TIOCSETP:
		case TIOCSETN:
		case TIOCSETC:
		case TIOCSLTC:
		case TIOCLBIS:
		case TIOCLBIC:
		case TIOCLSET:
#endif
			pti->pt_send |= TIOCPKT_IOCTL;
		default:
			break;
		}
	}
	stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 
		&& CCEQ(cc[VSTART], 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