usr/src/sys/kern/tty_pty.c

/*
 * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)tty_pty.c	7.29 (Berkeley) %G%
 */

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/vnode.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];	/* XXX */
struct	pt_ioctl {
	int	pt_flags;
	struct	selinfo pt_selr, pt_selw;
	u_char	pt_send;
	u_char	pt_ucntl;
	struct	clist pt_ioc;
} pt_ioctl[NPTY];		/* XXX */
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 */

void	ptsstop __P((struct tty *, int));

/*
 * Establish n (or default if n is 1) ptys in the system.
 *
 * XXX cdevsw & pstat require the array `pty[]' to be an array
 */
void
ptyattach(n)
	int n;
{
#ifdef notyet
	char *mem;
	register u_long ntb;
#define	DEFAULT_NPTY	32

	/* maybe should allow 0 => none? */
	if (n <= 1)
		n = DEFAULT_NPTY;
	ntb = n * sizeof(struct tty);
	mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl),
	    M_DEVBUF, M_WAITOK);
	pt_tty = (struct tty *)mem;
	mem = (char *)ALIGN(mem + ntb);
	pt_ioctl = (struct pt_ioctl *)mem;
	npty = n;
#endif
}

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

	if (minor(dev) >= npty)
		return (ENXIO);
	tp = &pt_tty[minor(dev)];
	if ((tp->t_state & TS_ISOPEN) == 0) {
		tp->t_state |= TS_WOPEN;
		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) {
		tp->t_state |= TS_WOPEN;
		if (flag&FNONBLOCK)
			break;
		if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
		    ttopen, 0))
			return (error);
	}
	error = (*linesw[tp->t_line].l_open)(dev, tp);
	ptcwakeup(tp, FREAD|FWRITE);
	return (error);
}

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

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

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, ttybg, 0))
				return (error);
		}
		if (tp->t_canq.c_cc == 0) {
			if (flag & IO_NDELAY)
				return (EWOULDBLOCK);
			if (error = ttysleep(tp, (caddr_t)&tp->t_canq,
			    TTIPRI | PCATCH, ttyin, 0))
				return (error);
			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, flag);
	ptcwakeup(tp, FWRITE);
	return (error);
}

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

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

	if (flag & FREAD) {
		selwakeup(&pti->pt_selr);
		wakeup((caddr_t)&tp->t_outq.c_cf);
	}
	if (flag & FWRITE) {
		selwakeup(&pti->pt_selw);
		wakeup((caddr_t)&tp->t_rawq.c_cf);
	}
}

/*ARGSUSED*/
#ifdef __STDC__
ptcopen(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)];
	if (tp->t_oproc)
		return (EIO);
	tp->t_oproc = ptsstart;
#ifdef sun4c
	tp->t_stop = ptsstop;
#endif
	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
	tp->t_lflag &= ~EXTPROC;
	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 */
	tp->t_session = 0;
	return (0);
	return (0);
}

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 (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 (0);	/* EOF */
		if (flag & IO_NDELAY)
			return (EWOULDBLOCK);
		if (error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH,
		    ttyin, 0))
			return (error);
	}
	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);
	}
	if (tp->t_outq.c_cc <= TTLOWAT(tp) && !(pti->pt_flags & PF_BLOCK))
		ptswake(tp);
	return (error);
}

void
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, 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)];
	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);
		selrecord(p, &pti->pt_selr);
		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_iflag&ICANON))
				    return (1);
			}
		}
		selrecord(p, &pti->pt_selw);
		break;

	}
	return (0);
}

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;
	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 (tp->t_canq.c_cc)
			goto block;
		while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
			if (cc == 0) {
				cc = min(uio->uio_resid, BUFSIZ);
				cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
				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);
			}
			if (cc)
				(void) b_to_q((char *)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_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 ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
			   (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {
				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 (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((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH,
	    ttyout, 0)) {
		/* adjust for data copied in but not written */
		uio->uio_resid += cc;
		return (error);
	}
	goto again;
}

/*ARGSUSED*/
ptyioctl(dev, cmd, data, flag, p)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	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);
			}
			tp->t_lflag |= EXTPROC;
		} else {
			if ((tp->t_state & EXTPROC) &&
			    (pti->pt_flags & PF_PKT)) {
				pti->pt_send |= TIOCPKT_IOCTL;
				ptcwakeup(tp);
			}
			tp->t_lflag &= ~EXTPROC;
		}
		return(0);
	} else
	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 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 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);

#ifdef COMPAT_43
		case FIONREAD:
			*(int *)data = tp->t_outq.c_cc;
			return (0);

		case TIOCSETP:
		case TIOCSETN:
#endif
		case TIOCSETD:
		case TIOCSETA:
		case TIOCSETAW:
		case TIOCSETAF:
			ndflush(&tp->t_outq, tp->t_outq.c_cc);
			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);
		}
	} 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 = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
	if (error < 0)
		 error = ttioctl(tp, cmd, data, flag);

	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
		case TIOCSETP:
		case TIOCSETN:
#endif
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
		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);
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
	6	*
	7	* @(#)tty_pty.c 7.29 (Berkeley) %G%
	8	*/
	9
	10	/*
	11	* Pseudo-teletype Driver
	12	* (Actually two drivers, requiring two entries in 'cdevsw')
	13	*/
	14	#include "pty.h" /* XXX */
	15
	16	#include <sys/param.h>
	17	#include <sys/systm.h>
	18	#include <sys/ioctl.h>
	19	#include <sys/proc.h>
	20	#include <sys/tty.h>
	21	#include <sys/conf.h>
	22	#include <sys/file.h>
	23	#include <sys/uio.h>
	24	#include <sys/kernel.h>
	25	#include <sys/vnode.h>
	26	#include "tsleep.h"
	27
	28	#if NPTY == 1
	29	#undef NPTY
	30	#define NPTY 32 /* crude XXX */
	31	#endif
	32
	33	#define BUFSIZ 100 /* Chunk size iomoved to/from user */
	34
	35	/*
	36	* pts == /dev/tty[pqrs]?
	37	* ptc == /dev/pty[pqrs]?
	38	*/
	39	struct tty pt_tty[NPTY]; /* XXX */
	40	struct pt_ioctl {
	41	int pt_flags;
	42	struct selinfo pt_selr, pt_selw;
	43	u_char pt_send;
	44	u_char pt_ucntl;
	45	struct clist pt_ioc;
	46	} pt_ioctl[NPTY]; /* XXX */
	47	int npty = NPTY; /* for pstat -t */
	48
	49	#define PF_RCOLL 0x0001
	50	#define PF_WCOLL 0x0002
	51	#define PF_NBIO 0x0004
	52	#define PF_PKT 0x0008 /* packet mode */
	53	#define PF_STOPPED 0x0010 /* user told stopped */
	54	#define PF_REMOTE 0x0020 /* remote and flow controlled input */
	55	#define PF_NOSTOP 0x0040
	56	#define PF_UCNTL 0x0080 /* user control mode */
	57	#define PF_TIOC 0x0100 /* transparent control mode */
	58	#define PF_LIOC 0x0200 /* transparent control locked */
	59	#define PF_WIOC 0x0400 /* waiting for PF_LIOC to clear */
	60	#define PF_BLOCK 0x0800 /* block writes to slave */
	61	#define PF_OWAIT 0x1000 /* waiting for PF_BLOCK to clear */
	62
	63	void ptsstop __P((struct tty *, int));
	64
	65	/*
	66	* Establish n (or default if n is 1) ptys in the system.
	67	*
	68	* XXX cdevsw & pstat require the array `pty[]' to be an array
	69	*/
	70	void
	71	ptyattach(n)
	72	int n;
	73	{
	74	#ifdef notyet
	75	char *mem;
	76	register u_long ntb;
	77	#define DEFAULT_NPTY 32
	78
	79	/* maybe should allow 0 => none? */
	80	if (n <= 1)
	81	n = DEFAULT_NPTY;
	82	ntb = n * sizeof(struct tty);
	83	mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl),
	84	M_DEVBUF, M_WAITOK);
	85	pt_tty = (struct tty *)mem;
	86	mem = (char *)ALIGN(mem + ntb);
	87	pt_ioctl = (struct pt_ioctl *)mem;
	88	npty = n;
	89	#endif
	90	}
	91
	92	/ARGSUSED/
	93	ptsopen(dev, flag, devtype, p)
	94	dev_t dev;
	95	int flag, devtype;
	96	struct proc *p;
	97	{
	98	register struct tty *tp;
	99	int error;
	100
	101	if (minor(dev) >= npty)
	102	return (ENXIO);
	103	tp = &pt_tty[minor(dev)];
	104	if ((tp->t_state & TS_ISOPEN) == 0) {
	105	tp->t_state \|= TS_WOPEN;
	106	ttychars(tp); /* Set up default chars */
	107	tp->t_iflag = TTYDEF_IFLAG;
	108	tp->t_oflag = TTYDEF_OFLAG;
	109	tp->t_lflag = TTYDEF_LFLAG;
	110	tp->t_cflag = TTYDEF_CFLAG;
	111	tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
	112	ttsetwater(tp); /* would be done in xxparam() */
	113	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
	114	return (EBUSY);
	115	if (tp->t_oproc) /* Ctrlr still around. */
	116	tp->t_state \|= TS_CARR_ON;
	117	while ((tp->t_state & TS_CARR_ON) == 0) {
	118	tp->t_state \|= TS_WOPEN;
	119	if (flag&FNONBLOCK)
	120	break;
	121	if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI \| PCATCH,
	122	ttopen, 0))
	123	return (error);
	124	}
	125	error = (*linesw[tp->t_line].l_open)(dev, tp);
	126	ptcwakeup(tp, FREAD\|FWRITE);
	127	return (error);
	128	}
	129
	130	ptsclose(dev, flag, mode, p)
	131	dev_t dev;
	132	int flag, mode;
	133	struct proc *p;
	134	{
	135	register struct tty *tp;
	136	int err;
	137
	138	tp = &pt_tty[minor(dev)];
	139	err = (*linesw[tp->t_line].l_close)(tp, flag);
	140	err \|= ttyclose(tp);
	141	ptcwakeup(tp, FREAD\|FWRITE);
	142	return (err);
	143	return (0);
	144	}
	145
	146	ptsread(dev, uio, flag)
	147	dev_t dev;
	148	struct uio *uio;
	149	int flag;
	150	{
	151	struct proc *p = curproc;
	152	register struct tty *tp = &pt_tty[minor(dev)];
	153	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	154	int error = 0;
	155
	156	again:
	157	if (pti->pt_flags & PF_REMOTE) {
	158	while (isbackground(p, tp)) {
	159	if ((p->p_sigignore & sigmask(SIGTTIN)) \|\|
	160	(p->p_sigmask & sigmask(SIGTTIN)) \|\|
	161	p->p_pgrp->pg_jobc == 0 \|\|
	162	p->p_flag&SPPWAIT)
	163	return (EIO);
	164	pgsignal(p->p_pgrp, SIGTTIN, 1);
	165	if (error = ttysleep(tp, (caddr_t)&lbolt,
	166	TTIPRI \| PCATCH, ttybg, 0))
	167	return (error);
	168	}
	169	if (tp->t_canq.c_cc == 0) {
	170	if (flag & IO_NDELAY)
	171	return (EWOULDBLOCK);
	172	if (error = ttysleep(tp, (caddr_t)&tp->t_canq,
	173	TTIPRI \| PCATCH, ttyin, 0))
	174	return (error);
	175	goto again;
	176	}
	177	while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
	178	if (ureadc(getc(&tp->t_canq), uio) < 0) {
	179	error = EFAULT;
	180	break;
	181	}
	182	if (tp->t_canq.c_cc == 1)
	183	(void) getc(&tp->t_canq);
	184	if (tp->t_canq.c_cc)
	185	return (error);
	186	} else
	187	if (tp->t_oproc)
	188	error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
	189	ptcwakeup(tp, FWRITE);
	190	return (error);
	191	}
	192
	193	/*
	194	* Write to pseudo-tty.
	195	* Wakeups of controlling tty will happen
	196	* indirectly, when tty driver calls ptsstart.
	197	*/
	198	ptswrite(dev, uio, flag)
	199	dev_t dev;
	200	struct uio *uio;
	201	int flag;
	202	{
	203	register struct tty *tp = &pt_tty[minor(dev)];
	204	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	205
	206	if (tp->t_oproc == 0)
	207	return (EIO);
	208
	209	while (pti->pt_flags & PF_BLOCK) {
	210	pti->pt_flags \|= PF_OWAIT;
	211	sleep((caddr_t)pti + 1, TTOPRI);
	212	}
	213
	214	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
	215	}
	216
	217	/*
	218	* Start output on pseudo-tty.
	219	* Wake up process selecting or sleeping for input from controlling tty.
	220	*/
	221	void
	222	ptsstart(tp)
	223	struct tty *tp;
	224	{
	225	register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	226
	227	if (tp->t_state & TS_TTSTOP)
	228	return;
	229	if (pti->pt_flags & PF_STOPPED) {
	230	pti->pt_flags &= ~PF_STOPPED;
	231	pti->pt_send = TIOCPKT_START;
	232	}
	233	ptcwakeup(tp, FREAD);
	234	}
	235
	236	ptcwakeup(tp, flag)
	237	struct tty *tp;
	238	int flag;
	239	{
	240	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	241
	242	if (flag & FREAD) {
	243	selwakeup(&pti->pt_selr);
	244	wakeup((caddr_t)&tp->t_outq.c_cf);
	245	}
	246	if (flag & FWRITE) {
	247	selwakeup(&pti->pt_selw);
	248	wakeup((caddr_t)&tp->t_rawq.c_cf);
	249	}
	250	}
	251
	252	/ARGSUSED/
	253	#ifdef __STDC__
	254	ptcopen(dev_t dev, int flag, int devtype, struct proc *p)
	255	#else
	256	ptcopen(dev, flag, devtype, p)
	257	dev_t dev;
	258	int flag, devtype;
	259	struct proc *p;
	260	#endif
	261	{
	262	register struct tty *tp;
	263	struct pt_ioctl *pti;
	264
	265	if (minor(dev) >= npty)
	266	return (ENXIO);
	267	tp = &pt_tty[minor(dev)];
	268	if (tp->t_oproc)
	269	return (EIO);
	270	tp->t_oproc = ptsstart;
	271	#ifdef sun4c
	272	tp->t_stop = ptsstop;
	273	#endif
	274	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
	275	tp->t_lflag &= ~EXTPROC;
	276	pti = &pt_ioctl[minor(dev)];
	277	pti->pt_flags = 0;
	278	pti->pt_send = 0;
	279	pti->pt_ucntl = 0;
	280	return (0);
	281	}
	282
	283	ptcclose(dev)
	284	dev_t dev;
	285	{
	286	register struct tty *tp;
	287
	288	tp = &pt_tty[minor(dev)];
	289	(void)(*linesw[tp->t_line].l_modem)(tp, 0);
	290	tp->t_state &= ~TS_CARR_ON;
	291	tp->t_oproc = 0; /* mark closed */
	292	tp->t_session = 0;
	293	return (0);
	294	return (0);
	295	}
	296
	297	ptcread(dev, uio, flag)
	298	dev_t dev;
	299	struct uio *uio;
	300	int flag;
	301	{
	302	register struct tty *tp = &pt_tty[minor(dev)];
	303	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	304	char buf[BUFSIZ];
	305	int error = 0, cc;
	306
	307	/*
	308	* We want to block until the slave
	309	* is open, and there's something to read;
	310	* but if we lost the slave or we're NBIO,
	311	* then return the appropriate error instead.
	312	*/
	313	for (;;) {
	314	if (tp->t_state&TS_ISOPEN) {
	315	if (pti->pt_flags&PF_PKT && pti->pt_send) {
	316	error = ureadc((int)pti->pt_send, uio);
	317	if (error)
	318	return (error);
	319	if (pti->pt_send & TIOCPKT_IOCTL) {
	320	cc = min(uio->uio_resid,
	321	sizeof(tp->t_termios));
	322	uiomove(&tp->t_termios, cc, uio);
	323	}
	324	pti->pt_send = 0;
	325	return (0);
	326	}
	327	if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
	328	error = ureadc((int)pti->pt_ucntl, uio);
	329	if (error)
	330	return (error);
	331	pti->pt_ucntl = 0;
	332	return (0);
	333	}
	334	if (pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc) {
	335	if (uio->uio_resid < pti->pt_ioc.c_cc + 1)
	336	return (E2BIG);
	337	error = ureadc(TIOCPKT_TIOC, uio);
	338	while (error == 0 && pti->pt_ioc.c_cc > 0) {
	339	cc = q_to_b(&pti->pt_ioc, buf,
	340	MIN(pti->pt_ioc.c_cc, BUFSIZ));
	341	if (cc <= 0) /* impossible? */
	342	break;
	343	error = uiomove(buf, cc, UIO_READ, uio);
	344	}
	345	return (error);
	346	}
	347	if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
	348	break;
	349	}
	350	if ((tp->t_state&TS_CARR_ON) == 0)
	351	return (0); /* EOF */
	352	if (flag & IO_NDELAY)
	353	return (EWOULDBLOCK);
	354	if (error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI \| PCATCH,
	355	ttyin, 0))
	356	return (error);
	357	}
	358	if (pti->pt_flags & (PF_PKT\|PF_UCNTL\|PF_TIOC))
	359	error = ureadc(0, uio);
	360	while (uio->uio_resid > 0 && error == 0) {
	361	cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
	362	if (cc <= 0)
	363	break;
	364	error = uiomove(buf, cc, uio);
	365	}
	366	if (tp->t_outq.c_cc <= TTLOWAT(tp) && !(pti->pt_flags & PF_BLOCK))
	367	ptswake(tp);
	368	return (error);
	369	}
	370
	371	void
	372	ptswake(tp)
	373	register struct tty *tp;
	374	{
	375	if (tp->t_state&TS_ASLEEP) {
	376	tp->t_state &= ~TS_ASLEEP;
	377	wakeup((caddr_t)&tp->t_outq);
	378	}
	379	if (tp->t_wsel) {
	380	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
	381	tp->t_wsel = 0;
	382	tp->t_state &= ~TS_WCOLL;
	383	}
	384	}
	385
	386	ptsstop(tp, flush)
	387	register struct tty *tp;
	388	int flush;
	389	{
	390	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	391	int flag;
	392
	393	/* note: FLUSHREAD and FLUSHWRITE already ok */
	394	if (flush == 0) {
	395	flush = TIOCPKT_STOP;
	396	pti->pt_flags \|= PF_STOPPED;
	397	} else
	398	pti->pt_flags &= ~PF_STOPPED;
	399	pti->pt_send \|= flush;
	400	/* change of perspective */
	401	flag = 0;
	402	if (flush & FREAD)
	403	flag \|= FWRITE;
	404	if (flush & FWRITE)
	405	flag \|= FREAD;
	406	ptcwakeup(tp, flag);
	407	}
	408
	409	ptcselect(dev, rw, p)
	410	dev_t dev;
	411	int rw;
	412	struct proc *p;
	413	{
	414	register struct tty *tp = &pt_tty[minor(dev)];
	415	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	416	int s;
	417
	418	if ((tp->t_state&TS_CARR_ON) == 0)
	419	return (1);
	420	switch (rw) {
	421
	422	case FREAD:
	423	/*
	424	* Need to block timeouts (ttrstart).
	425	*/
	426	s = spltty();
	427	if ((tp->t_state&TS_ISOPEN) &&
	428	tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
	429	splx(s);
	430	return (1);
	431	}
	432	splx(s);
	433	/* FALLTHROUGH */
	434
	435	case 0: /* exceptional */
	436	if ((tp->t_state&TS_ISOPEN) &&
	437	(pti->pt_flags&PF_PKT && pti->pt_send \|\|
	438	pti->pt_flags&PF_TIOC && pti->pt_ioc.c_cc \|\|
	439	pti->pt_flags&PF_UCNTL && pti->pt_ucntl))
	440	return (1);
	441	selrecord(p, &pti->pt_selr);
	442	break;
	443
	444
	445	case FWRITE:
	446	if (tp->t_state&TS_ISOPEN) {
	447	if (pti->pt_flags & PF_REMOTE) {
	448	if (tp->t_canq.c_cc == 0)
	449	return (1);
	450	} else {
	451	if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
	452	return (1);
	453	if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON))
	454	return (1);
	455	}
	456	}
	457	selrecord(p, &pti->pt_selw);
	458	break;
	459
	460	}
	461	return (0);
	462	}
	463
	464	ptcwrite(dev, uio, flag)
	465	dev_t dev;
	466	register struct uio *uio;
	467	int flag;
	468	{
	469	register struct tty *tp = &pt_tty[minor(dev)];
	470	register u_char *cp;
	471	register int cc = 0;
	472	u_char locbuf[BUFSIZ];
	473	int cnt = 0;
	474	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	475	int error = 0;
	476
	477	again:
	478	if ((tp->t_state&TS_ISOPEN) == 0)
	479	goto block;
	480	if (pti->pt_flags & PF_REMOTE) {
	481	if (tp->t_canq.c_cc)
	482	goto block;
	483	while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
	484	if (cc == 0) {
	485	cc = min(uio->uio_resid, BUFSIZ);
	486	cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
	487	cp = locbuf;
	488	error = uiomove((caddr_t)cp, cc, uio);
	489	if (error)
	490	return (error);
	491	/* check again for safety */
	492	if ((tp->t_state&TS_ISOPEN) == 0)
	493	return (EIO);
	494	}
	495	if (cc)
	496	(void) b_to_q((char *)cp, cc, &tp->t_canq);
	497	cc = 0;
	498	}
	499	(void) putc(0, &tp->t_canq);
	500	ttwakeup(tp);
	501	wakeup((caddr_t)&tp->t_canq);
	502	return (0);
	503	}
	504	while (uio->uio_resid > 0) {
	505	if (cc == 0) {
	506	cc = min(uio->uio_resid, BUFSIZ);
	507	cp = locbuf;
	508	error = uiomove((caddr_t)cp, cc, uio);
	509	if (error)
	510	return (error);
	511	/* check again for safety */
	512	if ((tp->t_state&TS_ISOPEN) == 0)
	513	return (EIO);
	514	}
	515	while (cc > 0) {
	516	if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
	517	(tp->t_canq.c_cc > 0 \|\| !(tp->t_iflag&ICANON))) {
	518	wakeup((caddr_t)&tp->t_rawq);
	519	goto block;
	520	}
	521	(linesw[tp->t_line].l_rint)(cp++, tp);
	522	cnt++;
	523	cc--;
	524	}
	525	cc = 0;
	526	}
	527	return (0);
	528	block:
	529	/*
	530	* Come here to wait for slave to open, for space
	531	* in outq, or space in rawq.
	532	*/
	533	if ((tp->t_state&TS_CARR_ON) == 0)
	534	return (EIO);
	535	if (flag & IO_NDELAY) {
	536	/* adjust for data copied in but not written */
	537	uio->uio_resid += cc;
	538	if (cnt == 0)
	539	return (EWOULDBLOCK);
	540	return (0);
	541	}
	542	if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI \| PCATCH,
	543	ttyout, 0)) {
	544	/* adjust for data copied in but not written */
	545	uio->uio_resid += cc;
	546	return (error);
	547	}
	548	goto again;
	549	}
	550
	551	/ARGSUSED/
	552	ptyioctl(dev, cmd, data, flag, p)
	553	dev_t dev;
	554	int cmd;
	555	caddr_t data;
	556	int flag;
	557	struct proc *p;
	558	{
	559	register struct tty *tp = &pt_tty[minor(dev)];
	560	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
	561	register u_char *cc = tp->t_cc;
	562	int stop, error;
	563
	564	/*
	565	* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
	566	* ttywflush(tp) will hang if there are characters in the outq.
	567	*/
	568	if (cmd == TIOCEXT) {
	569	/*
	570	* When the EXTPROC bit is being toggled, we need
	571	* to send an TIOCPKT_IOCTL if the packet driver
	572	* is turned on.
	573	*/
	574	if ((int )data) {
	575	if (pti->pt_flags & PF_PKT) {
	576	pti->pt_send \|= TIOCPKT_IOCTL;
	577	ptcwakeup(tp);
	578	}
	579	tp->t_lflag \|= EXTPROC;
	580	} else {
	581	if ((tp->t_state & EXTPROC) &&
	582	(pti->pt_flags & PF_PKT)) {
	583	pti->pt_send \|= TIOCPKT_IOCTL;
	584	ptcwakeup(tp);
	585	}
	586	tp->t_lflag &= ~EXTPROC;
	587	}
	588	return(0);
	589	} else
	590	if (cdevsw[major(dev)].d_open == ptcopen) {
	591	if ((cmd & 0xffff) == (TIOCIOANS(0) & 0xffff)) {
	592	if (!(pti->pt_flags & PF_LIOC) \|\| pti->pt_ioc.c_cc)
	593	return (EINVAL);
	594	(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
	595	wakeup((caddr_t)&pti->pt_ioc);
	596	return (0);
	597	}
	598	switch (cmd) {
	599
	600	case TIOCGPGRP:
	601	/*
	602	* We aviod calling ttioctl on the controller since,
	603	* in that case, tp must be the controlling terminal.
	604	*/
	605	(int )data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
	606	return (0);
	607
	608	case TIOCPKT:
	609	if ((int )data) {
	610	if (pti->pt_flags & PF_UCNTL)
	611	return (EINVAL);
	612	pti->pt_flags \|= PF_PKT;
	613	} else
	614	pti->pt_flags &= ~PF_PKT;
	615	return (0);
	616
	617	case TIOCUCNTL:
	618	if ((int )data) {
	619	if (pti->pt_flags & PF_PKT)
	620	return (EINVAL);
	621	pti->pt_flags \|= PF_UCNTL;
	622	} else
	623	pti->pt_flags &= ~PF_UCNTL;
	624	return (0);
	625
	626	case TIOCTIOC:
	627	if ((int )data) {
	628	if (pti->pt_flags & PF_UCNTL)
	629	return (EINVAL);
	630	pti->pt_flags \|= PF_TIOC;
	631	} else {
	632	pti->pt_flags &= ~(PF_TIOC\|PF_LIOC\|PF_WIOC);
	633	while (pti->pt_ioc.c_cc)
	634	(void) getc(&pti->pt_ioc);
	635	wakeup((caddr_t)&pti->pt_ioc);
	636	}
	637	return (0);
	638
	639	case TIOCBLK:
	640	if ((int )data)
	641	pti->pt_flags \|= PF_BLOCK;
	642	else {
	643	if (pti->pt_flags & PF_OWAIT)
	644	wakeup((caddr_t)pti + 1);
	645	pti->pt_flags &= ~(PF_BLOCK\|PF_OWAIT);
	646	ptswake(tp);
	647	}
	648	return (0);
	649
	650	case TIOCREMOTE:
	651	if ((int )data)
	652	pti->pt_flags \|= PF_REMOTE;
	653	else
	654	pti->pt_flags &= ~PF_REMOTE;
	655	ttyflush(tp, FREAD\|FWRITE);
	656	return (0);
	657
	658	#ifdef COMPAT_43
	659	case FIONREAD:
	660	(int )data = tp->t_outq.c_cc;
	661	return (0);
	662
	663	case TIOCSETP:
	664	case TIOCSETN:
	665	#endif
	666	case TIOCSETD:
	667	case TIOCSETA:
	668	case TIOCSETAW:
	669	case TIOCSETAF:
	670	ndflush(&tp->t_outq, tp->t_outq.c_cc);
	671	break;
	672
	673	case TIOCSIG:
	674	if ((unsigned int )data >= NSIG)
	675	return(EINVAL);
	676	if ((tp->t_lflag&NOFLSH) == 0)
	677	ttyflush(tp, FREAD\|FWRITE);
	678	pgsignal(tp->t_pgrp, (unsigned int )data, 1);
	679	if (((unsigned int )data == SIGINFO) &&
	680	((tp->t_lflag&NOKERNINFO) == 0))
	681	ttyinfo(tp);
	682	return(0);
	683	}
	684	} else if (pti->pt_flags & PF_TIOC) {
	685	while (pti->pt_flags & PF_LIOC) {
	686	pti->pt_flags \|= PF_WIOC;
	687	switch (tsleep((caddr_t)&pti->pt_flags,TTIPRI-1,5*hz)) {
	688	case TS_OK:
	689	continue;
	690	case TS_SIG:
	691	case TS_TIME:
	692	return (EBUSY);
	693	}
	694	}
	695	pti->pt_flags \|= PF_LIOC \| PF_BLOCK;
	696	while (pti->pt_ioc.c_cc)
	697	(void) getc(&pti->pt_ioc);
	698	(void) b_to_q(&cmd, sizeof cmd, &pti->pt_ioc);
	699	if (cmd & IOC_IN)
	700	(void) b_to_q(data, IOCPARM_LEN(cmd), &pti->pt_ioc);
	701	ptcwakeup(tp, FREAD);
	702	switch (tsleep((caddr_t)&pti->pt_ioc, TTIPRI-1, 5*hz)) {
	703	case TS_SIG:
	704	case TS_TIME:
	705	while (pti->pt_ioc.c_cc)
	706	(void) getc(&pti->pt_ioc);
	707	if (pti->pt_flags & PF_WIOC)
	708	wakeup((caddr_t)&pti->pt_flags);
	709	if (pti->pt_flags & PF_OWAIT)
	710	wakeup((caddr_t)pti + 1);
	711	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	712	ptswake(tp);
	713	return (EBUSY);
	714	case TS_OK:
	715	break;
	716	}
	717	if (pti->pt_ioc.c_cc == 0) {
	718	if (pti->pt_flags & PF_WIOC)
	719	wakeup((caddr_t)&pti->pt_flags);
	720	if (pti->pt_flags & PF_OWAIT)
	721	wakeup((caddr_t)pti + 1);
	722	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	723	ptswake(tp);
	724	goto doioctl;
	725	}
	726	if (q_to_b(&pti->pt_ioc, &error, sizeof error) != sizeof error)
	727	error = EINVAL;
	728	if (error == 0 && cmd & IOC_OUT) {
	729	if (IOCPARM_LEN(cmd) != pti->pt_ioc.c_cc)
	730	error = EINVAL;
	731	else
	732	(void) q_to_b(&pti->pt_ioc, data,
	733	pti->pt_ioc.c_cc);
	734	}
	735	while (pti->pt_ioc.c_cc)
	736	(void) getc(&pti->pt_ioc);
	737	if (pti->pt_flags & PF_WIOC)
	738	wakeup((caddr_t)&pti->pt_flags);
	739	if (pti->pt_flags & PF_OWAIT)
	740	wakeup((caddr_t)pti + 1);
	741	pti->pt_flags &= ~(PF_LIOC\|PF_WIOC\|PF_BLOCK\|PF_OWAIT);
	742	ptswake(tp);
	743	return (error);
	744	}
	745
	746	doioctl:
	747	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
	748	if (error < 0)
	749	error = ttioctl(tp, cmd, data, flag);
	750
	751	if (error < 0) {
	752	if (pti->pt_flags & PF_UCNTL &&
	753	(cmd & ~0xff) == UIOCCMD(0)) {
	754	if (cmd & 0xff) {
	755	pti->pt_ucntl = (u_char)cmd;
	756	ptcwakeup(tp, FREAD);
	757	}
	758	return (0);
	759	}
	760	error = ENOTTY;
	761	}
	762	/*
	763	* If external processing and packet mode send ioctl packet.
	764	*/
	765	if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
	766	switch(cmd) {
	767	case TIOCSETA:
	768	case TIOCSETAW:
	769	case TIOCSETAF:
	770	#ifdef COMPAT_43
	771	case TIOCSETP:
	772	case TIOCSETN:
	773	#endif
	774	#if defined(COMPAT_43) \|\| defined(COMPAT_SUNOS)
	775	case TIOCSETC:
	776	case TIOCSLTC:
	777	case TIOCLBIS:
	778	case TIOCLBIC:
	779	case TIOCLSET:
	780	#endif
	781	pti->pt_send \|= TIOCPKT_IOCTL;
	782	default:
	783	break;
	784	}
	785	}
	786	stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
	787	&& CCEQ(cc[VSTART], CTRL('q'));
	788	if (pti->pt_flags & PF_NOSTOP) {
	789	if (stop) {
	790	pti->pt_send &= ~TIOCPKT_NOSTOP;
	791	pti->pt_send \|= TIOCPKT_DOSTOP;
	792	pti->pt_flags &= ~PF_NOSTOP;
	793	ptcwakeup(tp, FREAD);
	794	}
	795	} else {
	796	if (!stop) {
	797	pti->pt_send &= ~TIOCPKT_DOSTOP;
	798	pti->pt_send \|= TIOCPKT_NOSTOP;
	799	pti->pt_flags \|= PF_NOSTOP;
	800	ptcwakeup(tp, FREAD);
	801	}
	802	}
	803	return (error);
	804	}