[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	7.1 (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"

#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;
} pt_ioctl[NPTY];
int	npty = NPTY;		/* for pstat -t */

#define	PF_RCOLL	0x01
#define	PF_WCOLL	0x02
#define	PF_NBIO		0x04
#define	PF_PKT		0x08		/* packet mode */
#define	PF_STOPPED	0x10		/* user told stopped */
#define	PF_REMOTE	0x20		/* remote and flow controlled input */
#define	PF_NOSTOP	0x40
#define PF_UCNTL	0x80		/* user control mode */

/*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);
}

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;

	tp = &pt_tty[minor(dev)];
	if (tp->t_oproc == 0)
		return (EIO);
	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);
	tp->t_state |= TS_CARR_ON;
	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_oproc = 0;		/* mark closed */
}

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 (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))
		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)) {
		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;
		}
	}
	return (error);
}

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_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)
		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 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 TIOCSETP:
		case TIOCSETN:
		case TIOCSETD:
			while (getc(&tp->t_outq) >= 0)
				;
			break;
		}
	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);
		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	*
0880b18e	6	* @(#)tty_pty.c 7.1 (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"
941944c9	27
b3c8737d	28	#if NPTY == 1
5bb90914	29	#undef NPTY
c91c01fe	30	#define NPTY 32 /* crude XXX */
b3c8737d	31	#endif
45372428	32
2bb0bef9	33	#define BUFSIZ 100 /* Chunk size iomoved to/from user */
e1d74936	34
45372428	35	/*
5bb90914 JB	36	* pts == /dev/tty[pqrs]?
5bb90914 JB	37	* ptc == /dev/pty[pqrs]?
45372428	38	*/
e1d74936 BJ	39	struct tty pt_tty[NPTY];
e1d74936 BJ	40	struct pt_ioctl {
1a954a11	41	int pt_flags;
1a954a11	42	struct proc pt_selr, pt_selw;
5bb90914 JB	43	u_char pt_send;
5bb90914 JB	44	u_char pt_ucntl;
e1d74936	45	} pt_ioctl[NPTY];
5bb90914	46	int npty = NPTY; /* for pstat -t */
45372428	47
1a954a11 BJ	48	#define PF_RCOLL 0x01
	49	#define PF_WCOLL 0x02
	50	#define PF_NBIO 0x04
	51	#define PF_PKT 0x08 /* packet mode */
1e6d24b1	52	#define PF_STOPPED 0x10 /* user told stopped */
defdbcd1	53	#define PF_REMOTE 0x20 /* remote and flow controlled input */
0a2bd708	54	#define PF_NOSTOP 0x40
5bb90914	55	#define PF_UCNTL 0x80 /* user control mode */
45372428 MT	56
	57	/ARGSUSED/
	58	ptsopen(dev, flag)
73c77d38	59	dev_t dev;
e1d74936	60	{
45372428	61	register struct tty *tp;
5bb90914	62	int error;
45372428	63
5bb90914 JB	64	#ifdef lint
	65	npty = npty;
	66	#endif
f21c8fb8 BJ	67	if (minor(dev) >= NPTY)
f21c8fb8 BJ	68	return (ENXIO);
45372428	69	tp = &pt_tty[minor(dev)];
941944c9	70	if ((tp->t_state & TS_ISOPEN) == 0) {
bdda6b91	71	ttychars(tp); /* Set up default chars */
d2f24af0	72	tp->t_ispeed = tp->t_ospeed = EXTB;
bdda6b91	73	tp->t_flags = 0; /* No features (nor raw mode) */
f21c8fb8 BJ	74	} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0)
f21c8fb8 BJ	75	return (EBUSY);
e1d74936	76	if (tp->t_oproc) /* Ctrlr still around. */
941944c9 BJ	77	tp->t_state \|= TS_CARR_ON;
	78	while ((tp->t_state & TS_CARR_ON) == 0) {
	79	tp->t_state \|= TS_WOPEN;
45372428 MT	80	sleep((caddr_t)&tp->t_rawq, TTIPRI);
45372428 MT	81	}
5bb90914 JB	82	error = (*linesw[tp->t_line].l_open)(dev, tp);
	83	ptcwakeup(tp, FREAD\|FWRITE);
	84	return (error);
45372428 MT	85	}
	86
	87	ptsclose(dev)
73c77d38	88	dev_t dev;
941944c9	89	{
45372428 MT	90	register struct tty *tp;
	91
	92	tp = &pt_tty[minor(dev)];
	93	(*linesw[tp->t_line].l_close)(tp);
4b39cb77	94	ttyclose(tp);
5bb90914	95	ptcwakeup(tp, FREAD\|FWRITE);
45372428 MT	96	}
45372428 MT	97
ae9a0a69	98	ptsread(dev, uio)
73c77d38	99	dev_t dev;
ae9a0a69	100	struct uio *uio;
e1d74936	101	{
defdbcd1 BJ	102	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1 BJ	103	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	104	int error = 0;
defdbcd1 BJ	105
	106	again:
	107	if (pti->pt_flags & PF_REMOTE) {
	108	while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
5bb90914 JB	109	if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) \|\|
5bb90914 JB	110	(u.u_procp->p_sigmask & sigmask(SIGTTIN)) \|\|
defdbcd1	111	u.u_procp->p_flag&SVFORK)
840510a3	112	return (EIO);
defdbcd1 BJ	113	gsignal(u.u_procp->p_pgrp, SIGTTIN);
defdbcd1 BJ	114	sleep((caddr_t)&lbolt, TTIPRI);
941944c9	115	}
5bb90914	116	if (tp->t_canq.c_cc == 0) {
840510a3 BJ	117	if (tp->t_state & TS_NBIO)
840510a3 BJ	118	return (EWOULDBLOCK);
5bb90914	119	sleep((caddr_t)&tp->t_canq, TTIPRI);
defdbcd1 BJ	120	goto again;
defdbcd1 BJ	121	}
5bb90914 JB	122	while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
5bb90914 JB	123	if (ureadc(getc(&tp->t_canq), uio) < 0) {
840510a3	124	error = EFAULT;
ae9a0a69 BJ	125	break;
ae9a0a69 BJ	126	}
5bb90914 JB	127	if (tp->t_canq.c_cc == 1)
	128	(void) getc(&tp->t_canq);
	129	if (tp->t_canq.c_cc)
840510a3	130	return (error);
defdbcd1 BJ	131	} else
defdbcd1 BJ	132	if (tp->t_oproc)
840510a3	133	error = (*linesw[tp->t_line].l_read)(tp, uio);
5bb90914	134	ptcwakeup(tp, FWRITE);
840510a3	135	return (error);
45372428 MT	136	}
45372428 MT	137
941944c9 BJ	138	/*
	139	* Write to pseudo-tty.
	140	* Wakeups of controlling tty will happen
	141	* indirectly, when tty driver calls ptsstart.
	142	*/
ae9a0a69	143	ptswrite(dev, uio)
73c77d38	144	dev_t dev;
ae9a0a69	145	struct uio *uio;
e1d74936	146	{
45372428 MT	147	register struct tty *tp;
	148
	149	tp = &pt_tty[minor(dev)];
840510a3 BJ	150	if (tp->t_oproc == 0)
	151	return (EIO);
	152	return ((*linesw[tp->t_line].l_write)(tp, uio));
45372428 MT	153	}
45372428 MT	154
941944c9 BJ	155	/*
	156	* Start output on pseudo-tty.
	157	* Wake up process selecting or sleeping for input from controlling tty.
	158	*/
45372428	159	ptsstart(tp)
e1d74936 BJ	160	struct tty *tp;
e1d74936 BJ	161	{
1e6d24b1	162	register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
e1d74936	163
941944c9	164	if (tp->t_state & TS_TTSTOP)
45372428	165	return;
1e6d24b1 BJ	166	if (pti->pt_flags & PF_STOPPED) {
	167	pti->pt_flags &= ~PF_STOPPED;
	168	pti->pt_send = TIOCPKT_START;
	169	}
5bb90914	170	ptcwakeup(tp, FREAD);
d427b3b2 BJ	171	}
d427b3b2 BJ	172
5bb90914	173	ptcwakeup(tp, flag)
d427b3b2 BJ	174	struct tty *tp;
	175	{
	176	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	177
5bb90914 JB	178	if (flag & FREAD) {
	179	if (pti->pt_selr) {
	180	selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL);
	181	pti->pt_selr = 0;
	182	pti->pt_flags &= ~PF_RCOLL;
	183	}
	184	wakeup((caddr_t)&tp->t_outq.c_cf);
	185	}
	186	if (flag & FWRITE) {
	187	if (pti->pt_selw) {
	188	selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
	189	pti->pt_selw = 0;
	190	pti->pt_flags &= ~PF_WCOLL;
	191	}
	192	wakeup((caddr_t)&tp->t_rawq.c_cf);
e1d74936	193	}
45372428 MT	194	}
	195
	196	/ARGSUSED/
	197	ptcopen(dev, flag)
e1d74936 BJ	198	dev_t dev;
	199	int flag;
	200	{
45372428	201	register struct tty *tp;
1a954a11	202	struct pt_ioctl *pti;
45372428	203
f21c8fb8 BJ	204	if (minor(dev) >= NPTY)
f21c8fb8 BJ	205	return (ENXIO);
45372428	206	tp = &pt_tty[minor(dev)];
f21c8fb8 BJ	207	if (tp->t_oproc)
f21c8fb8 BJ	208	return (EIO);
e1d74936	209	tp->t_oproc = ptsstart;
f2f3b49b	210	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
941944c9	211	tp->t_state \|= TS_CARR_ON;
1a954a11 BJ	212	pti = &pt_ioctl[minor(dev)];
	213	pti->pt_flags = 0;
	214	pti->pt_send = 0;
5bb90914	215	pti->pt_ucntl = 0;
f21c8fb8	216	return (0);
45372428 MT	217	}
	218
	219	ptcclose(dev)
e1d74936 BJ	220	dev_t dev;
e1d74936 BJ	221	{
45372428 MT	222	register struct tty *tp;
	223
	224	tp = &pt_tty[minor(dev)];
f2f3b49b	225	(void)(*linesw[tp->t_line].l_modem)(tp, 0);
e1d74936	226	tp->t_oproc = 0; /* mark closed */
45372428 MT	227	}
45372428 MT	228
ae9a0a69	229	ptcread(dev, uio)
1a954a11	230	dev_t dev;
ae9a0a69	231	struct uio *uio;
e1d74936	232	{
840510a3	233	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914	234	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
2bb0bef9 SL	235	char buf[BUFSIZ];
2bb0bef9 SL	236	int error = 0, cc;
45372428	237
5bb90914 JB	238	/*
	239	* We want to block until the slave
	240	* is open, and there's something to read;
	241	* but if we lost the slave or we're NBIO,
	242	* then return the appropriate error instead.
	243	*/
	244	for (;;) {
	245	if (tp->t_state&TS_ISOPEN) {
	246	if (pti->pt_flags&PF_PKT && pti->pt_send) {
8011f5df	247	error = ureadc((int)pti->pt_send, uio);
5bb90914 JB	248	if (error)
	249	return (error);
	250	pti->pt_send = 0;
	251	return (0);
	252	}
	253	if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
8011f5df	254	error = ureadc((int)pti->pt_ucntl, uio);
5bb90914 JB	255	if (error)
	256	return (error);
	257	pti->pt_ucntl = 0;
	258	return (0);
	259	}
	260	if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
	261	break;
1a954a11	262	}
2bb0bef9 SL	263	if ((tp->t_state&TS_CARR_ON) == 0)
2bb0bef9 SL	264	return (EIO);
840510a3 BJ	265	if (pti->pt_flags&PF_NBIO)
840510a3 BJ	266	return (EWOULDBLOCK);
45372428	267	sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
8b8271ac	268	}
5bb90914 JB	269	if (pti->pt_flags & (PF_PKT\|PF_UCNTL))
5bb90914 JB	270	error = ureadc(0, uio);
2bb0bef9 SL	271	while (uio->uio_resid > 0 && error == 0) {
	272	cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
	273	if (cc <= 0)
ae9a0a69	274	break;
2bb0bef9 SL	275	error = uiomove(buf, cc, UIO_READ, uio);
2bb0bef9 SL	276	}
941944c9 BJ	277	if (tp->t_outq.c_cc <= TTLOWAT(tp)) {
	278	if (tp->t_state&TS_ASLEEP) {
	279	tp->t_state &= ~TS_ASLEEP;
	280	wakeup((caddr_t)&tp->t_outq);
	281	}
	282	if (tp->t_wsel) {
	283	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
	284	tp->t_wsel = 0;
	285	tp->t_state &= ~TS_WCOLL;
	286	}
45372428	287	}
840510a3	288	return (error);
45372428 MT	289	}
45372428 MT	290
1a954a11 BJ	291	ptsstop(tp, flush)
	292	register struct tty *tp;
	293	int flush;
	294	{
	295	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
5bb90914	296	int flag;
1a954a11	297
1e6d24b1 BJ	298	/* note: FLUSHREAD and FLUSHWRITE already ok */
	299	if (flush == 0) {
	300	flush = TIOCPKT_STOP;
	301	pti->pt_flags \|= PF_STOPPED;
5bb90914	302	} else
1e6d24b1	303	pti->pt_flags &= ~PF_STOPPED;
0a2bd708	304	pti->pt_send \|= flush;
5bb90914 JB	305	/* change of perspective */
	306	flag = 0;
	307	if (flush & FREAD)
	308	flag \|= FWRITE;
	309	if (flush & FWRITE)
	310	flag \|= FREAD;
9d2a90b1	311	ptcwakeup(tp, flag);
1a954a11 BJ	312	}
1a954a11 BJ	313
941944c9	314	ptcselect(dev, rw)
e1d74936	315	dev_t dev;
941944c9	316	int rw;
e1d74936 BJ	317	{
e1d74936 BJ	318	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1	319	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
e1d74936	320	struct proc *p;
d427b3b2	321	int s;
e1d74936	322
5bb90914	323	if ((tp->t_state&TS_CARR_ON) == 0)
e1d74936	324	return (1);
941944c9 BJ	325	switch (rw) {
	326
	327	case FREAD:
892f2f35 MK	328	/*
	329	* Need to block timeouts (ttrstart).
	330	*/
	331	s = spltty();
7cbd29e4 MK	332	if ((tp->t_state&TS_ISOPEN) &&
	333	tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
	334	splx(s);
	335	return (1);
	336	}
892f2f35	337	splx(s);
7cbd29e4 MK	338	/* FALLTHROUGH */
	339
	340	case 0: /* exceptional */
5bb90914 JB	341	if ((tp->t_state&TS_ISOPEN) &&
5bb90914 JB	342	(pti->pt_flags&PF_PKT && pti->pt_send \|\|
892f2f35	343	pti->pt_flags&PF_UCNTL && pti->pt_ucntl))
941944c9	344	return (1);
1a954a11 BJ	345	if ((p = pti->pt_selr) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	346	pti->pt_flags \|= PF_RCOLL;
941944c9	347	else
1a954a11	348	pti->pt_selr = u.u_procp;
d427b3b2	349	break;
941944c9	350
7cbd29e4	351
941944c9	352	case FWRITE:
892f2f35 MK	353	if (tp->t_state&TS_ISOPEN) {
	354	if (pti->pt_flags & PF_REMOTE) {
	355	if (tp->t_canq.c_cc == 0)
	356	return (1);
	357	} else {
	358	if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
	359	return (1);
	360	if (tp->t_canq.c_cc == 0 &&
aec7dd3b	361	(tp->t_flags & (RAW\|CBREAK)) == 0)
892f2f35 MK	362	return (1);
892f2f35 MK	363	}
d427b3b2	364	}
1a954a11 BJ	365	if ((p = pti->pt_selw) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	366	pti->pt_flags \|= PF_WCOLL;
941944c9	367	else
1a954a11	368	pti->pt_selw = u.u_procp;
d427b3b2	369	break;
7cbd29e4	370
941944c9	371	}
d427b3b2	372	return (0);
e1d74936 BJ	373	}
e1d74936 BJ	374
ae9a0a69	375	ptcwrite(dev, uio)
941944c9	376	dev_t dev;
5bb90914	377	register struct uio *uio;
e1d74936	378	{
840510a3	379	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914 JB	380	register struct iovec *iov;
	381	register char *cp;
	382	register int cc = 0;
45372428	383	char locbuf[BUFSIZ];
941944c9	384	int cnt = 0;
defdbcd1	385	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	386	int error = 0;
45372428	387
defdbcd1	388	again:
5bb90914 JB	389	if ((tp->t_state&TS_ISOPEN) == 0)
5bb90914 JB	390	goto block;
9d2a90b1	391	if (pti->pt_flags & PF_REMOTE) {
5bb90914 JB	392	if (tp->t_canq.c_cc)
5bb90914 JB	393	goto block;
9d2a90b1 JB	394	while (uio->uio_iovcnt > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
	395	iov = uio->uio_iov;
	396	if (iov->iov_len == 0) {
	397	uio->uio_iovcnt--;
	398	uio->uio_iov++;
	399	continue;
	400	}
	401	if (cc == 0) {
	402	cc = MIN(iov->iov_len, BUFSIZ);
	403	cc = MIN(cc, TTYHOG - 1 - tp->t_canq.c_cc);
	404	cp = locbuf;
	405	error = uiomove(cp, cc, UIO_WRITE, uio);
	406	if (error)
	407	return (error);
	408	/* check again for safety */
	409	if ((tp->t_state&TS_ISOPEN) == 0)
	410	return (EIO);
	411	}
	412	if (cc)
	413	(void) b_to_q(cp, cc, &tp->t_canq);
	414	cc = 0;
defdbcd1	415	}
5bb90914 JB	416	(void) putc(0, &tp->t_canq);
	417	ttwakeup(tp);
	418	wakeup((caddr_t)&tp->t_canq);
	419	return (0);
	420	}
	421	while (uio->uio_iovcnt > 0) {
	422	iov = uio->uio_iov;
	423	if (cc == 0) {
	424	if (iov->iov_len == 0) {
	425	uio->uio_iovcnt--;
	426	uio->uio_iov++;
	427	continue;
45372428	428	}
5bb90914 JB	429	cc = MIN(iov->iov_len, BUFSIZ);
	430	cp = locbuf;
	431	error = uiomove(cp, cc, UIO_WRITE, uio);
	432	if (error)
	433	return (error);
	434	/* check again for safety */
	435	if ((tp->t_state&TS_ISOPEN) == 0)
	436	return (EIO);
	437	}
9d2a90b1 JB	438	while (cc > 0) {
9d2a90b1 JB	439	if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
892f2f35 MK	440	(tp->t_canq.c_cc > 0 \|\|
892f2f35 MK	441	tp->t_flags & (RAW\|CBREAK))) {
9d2a90b1 JB	442	wakeup((caddr_t)&tp->t_rawq);
	443	goto block;
	444	}
36612a8f	445	(linesw[tp->t_line].l_rint)(cp++, tp);
941944c9	446	cnt++;
9d2a90b1	447	cc--;
45372428	448	}
5bb90914 JB	449	cc = 0;
	450	}
	451	return (0);
	452	block:
	453	/*
9d2a90b1 JB	454	* Come here to wait for slave to open, for space
9d2a90b1 JB	455	* in outq, or space in rawq.
5bb90914 JB	456	*/
	457	if ((tp->t_state&TS_CARR_ON) == 0)
	458	return (EIO);
	459	if (pti->pt_flags & PF_NBIO) {
5bb90914 JB	460	iov->iov_base -= cc;
	461	iov->iov_len += cc;
	462	uio->uio_resid += cc;
	463	uio->uio_offset -= cc;
9d2a90b1 JB	464	if (cnt == 0)
9d2a90b1 JB	465	return (EWOULDBLOCK);
5bb90914 JB	466	return (0);
	467	}
	468	sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
	469	goto again;
45372428 MT	470	}
45372428 MT	471
45372428	472	/ARGSUSED/
4b72e2f9 SL	473	ptyioctl(dev, cmd, data, flag)
4b72e2f9 SL	474	caddr_t data;
e1d74936 BJ	475	dev_t dev;
e1d74936 BJ	476	{
0a2bd708 BJ	477	register struct tty *tp = &pt_tty[minor(dev)];
0a2bd708 BJ	478	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
5bb90914	479	int stop, error;
f2f3b49b	480	extern ttyinput();
45372428	481
f2f3b49b MK	482	/*
	483	* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
	484	* ttywflush(tp) will hang if there are characters in the outq.
	485	*/
4b72e2f9 SL	486	if (cdevsw[major(dev)].d_open == ptcopen)
	487	switch (cmd) {
	488
	489	case TIOCPKT:
5bb90914 JB	490	if ((int )data) {
	491	if (pti->pt_flags & PF_UCNTL)
	492	return (EINVAL);
1a954a11	493	pti->pt_flags \|= PF_PKT;
5bb90914	494	} else
1a954a11	495	pti->pt_flags &= ~PF_PKT;
f21c8fb8	496	return (0);
4b72e2f9	497
5bb90914 JB	498	case TIOCUCNTL:
	499	if ((int )data) {
	500	if (pti->pt_flags & PF_PKT)
	501	return (EINVAL);
	502	pti->pt_flags \|= PF_UCNTL;
	503	} else
	504	pti->pt_flags &= ~PF_UCNTL;
	505	return (0);
	506
4b72e2f9 SL	507	case TIOCREMOTE:
4b72e2f9 SL	508	if ((int )data)
defdbcd1 BJ	509	pti->pt_flags \|= PF_REMOTE;
	510	else
	511	pti->pt_flags &= ~PF_REMOTE;
88a7a62a	512	ttyflush(tp, FREAD\|FWRITE);
f21c8fb8	513	return (0);
4b72e2f9 SL	514
	515	case FIONBIO:
	516	if ((int )data)
1a954a11	517	pti->pt_flags \|= PF_NBIO;
8b8271ac	518	else
1a954a11	519	pti->pt_flags &= ~PF_NBIO;
f21c8fb8	520	return (0);
4b72e2f9 SL	521
4b72e2f9 SL	522	case TIOCSETP:
f2f3b49b MK	523	case TIOCSETN:
f2f3b49b MK	524	case TIOCSETD:
4b72e2f9 SL	525	while (getc(&tp->t_outq) >= 0)
	526	;
	527	break;
8b8271ac	528	}
477d62ec	529	error = ttioctl(tp, cmd, data, flag);
f2f3b49b MK	530	/*
	531	* Since we use the tty queues internally,
	532	* pty's can't be switched to disciplines which overwrite
	533	* the queues. We can't tell anything about the discipline
	534	* from here...
	535	*/
	536	if (linesw[tp->t_line].l_rint != ttyinput) {
	537	(*linesw[tp->t_line].l_close)(tp);
	538	tp->t_line = 0;
	539	(void)(*linesw[tp->t_line].l_open)(dev, tp);
	540	error = ENOTTY;
	541	}
5bb90914 JB	542	if (error < 0) {
5bb90914 JB	543	if (pti->pt_flags & PF_UCNTL &&
97d7430f	544	(cmd & ~0xff) == UIOCCMD(0)) {
5bb90914 JB	545	if (cmd & 0xff) {
	546	pti->pt_ucntl = (u_char)cmd;
	547	ptcwakeup(tp, FREAD);
	548	}
	549	return (0);
	550	}
f21c8fb8	551	error = ENOTTY;
5bb90914 JB	552	}
	553	stop = (tp->t_flags & RAW) == 0 &&
	554	tp->t_stopc == CTRL(s) && tp->t_startc == CTRL(q);
0a2bd708 BJ	555	if (pti->pt_flags & PF_NOSTOP) {
0a2bd708 BJ	556	if (stop) {
b31eb1ff	557	pti->pt_send &= ~TIOCPKT_NOSTOP;
0a2bd708 BJ	558	pti->pt_send \|= TIOCPKT_DOSTOP;
0a2bd708 BJ	559	pti->pt_flags &= ~PF_NOSTOP;
5bb90914	560	ptcwakeup(tp, FREAD);
0a2bd708 BJ	561	}
0a2bd708 BJ	562	} else {
5bb90914	563	if (!stop) {
0a2bd708 BJ	564	pti->pt_send &= ~TIOCPKT_DOSTOP;
	565	pti->pt_send \|= TIOCPKT_NOSTOP;
	566	pti->pt_flags \|= PF_NOSTOP;
5bb90914	567	ptcwakeup(tp, FREAD);
0a2bd708 BJ	568	}
0a2bd708 BJ	569	}
f21c8fb8	570	return (error);
45372428	571	}
4f07e6e5	572	#endif