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

/*	tty_pty.c	6.11	85/06/07	*/

/*
 * 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;
	int	pt_gensym;
	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&SDETACH) ||
	*/
			    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;
	if (tp->t_state & TS_WOPEN)
		wakeup((caddr_t)&tp->t_rawq);
	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)];
	if (tp->t_state & TS_ISOPEN)
		gsignal(tp->t_pgrp, SIGHUP);
	tp->t_state &= ~TS_CARR_ON;	/* virtual carrier gone */
	ttyflush(tp, FREAD|FWRITE);
	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(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(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, flush);
}

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);
	s = spl5();
	switch (rw) {

	case FREAD:
		if ((tp->t_state&TS_ISOPEN) &&
		    (pti->pt_flags&PF_PKT && pti->pt_send ||
		     pti->pt_flags&PF_UCNTL && pti->pt_ucntl ||
		     tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)) {
			splx(s);
			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) &&
		    ((pti->pt_flags&PF_REMOTE) == 0 || tp->t_canq.c_cc == 0)) {
			splx(s);
			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;
	}
	splx(s);
	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 (cnt == 0 && pti->pt_flags & PF_REMOTE) {
		if (uio->uio_iovcnt <= 0)
			return (0);
		if (tp->t_canq.c_cc)
			goto block;
		iov = uio->uio_iov;
		if (cc == 0 && iov->iov_len) {
			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);
			if (tp->t_canq.c_cc)
				goto block;
		}
		if (cc)
			(void) b_to_q(cp, cc, &tp->t_canq);
		(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) {
			(*linesw[tp->t_line].l_rint)(*cp++, tp);
			cnt++;
		}
		cc = 0;
	}
	return (0);
block:
	/*
	 * Come here to wait for slave to open or for space
	 * in outq.
	 */
	if ((tp->t_state&TS_CARR_ON) == 0)
		return (EIO);
	if (pti->pt_flags & PF_NBIO) {
		if (cnt == 0)
			return (EWOULDBLOCK);
		iov->iov_base -= cc;
		iov->iov_len += cc;
		uio->uio_resid += cc;
		uio->uio_offset -= cc;
		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;

	/* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG ??? */
	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:
			while (getc(&tp->t_outq) >= 0)
				;
			break;
		}
	error = ttioctl(tp, cmd, data, flag);
	if (error < 0) {
		if (pti->pt_flags & PF_UCNTL &&
		    (cmd & ~0xff) == _IO(u,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
d19cae27	1	/* tty_pty.c 6.11 85/06/07 */
be4367b3	2
45372428 MT	3	/*
	4	* Pseudo-teletype Driver
	5	* (Actually two drivers, requiring two entries in 'cdevsw')
45372428	6	*/
647d645f MT	7	#include "pty.h"
647d645f MT	8
f12183e4	9	#if NPTY > 0
94368568 JB	10	#include "param.h"
	11	#include "systm.h"
	12	#include "ioctl.h"
	13	#include "tty.h"
	14	#include "dir.h"
	15	#include "user.h"
	16	#include "conf.h"
	17	#include "file.h"
	18	#include "proc.h"
	19	#include "uio.h"
	20	#include "kernel.h"
941944c9	21
b3c8737d	22	#if NPTY == 1
5bb90914	23	#undef NPTY
c91c01fe	24	#define NPTY 32 /* crude XXX */
b3c8737d	25	#endif
45372428	26
2bb0bef9	27	#define BUFSIZ 100 /* Chunk size iomoved to/from user */
e1d74936	28
45372428	29	/*
5bb90914 JB	30	* pts == /dev/tty[pqrs]?
5bb90914 JB	31	* ptc == /dev/pty[pqrs]?
45372428	32	*/
e1d74936 BJ	33	struct tty pt_tty[NPTY];
e1d74936 BJ	34	struct pt_ioctl {
1a954a11 BJ	35	int pt_flags;
	36	int pt_gensym;
	37	struct proc pt_selr, pt_selw;
5bb90914 JB	38	u_char pt_send;
5bb90914 JB	39	u_char pt_ucntl;
e1d74936	40	} pt_ioctl[NPTY];
5bb90914	41	int npty = NPTY; /* for pstat -t */
45372428	42
1a954a11 BJ	43	#define PF_RCOLL 0x01
	44	#define PF_WCOLL 0x02
	45	#define PF_NBIO 0x04
	46	#define PF_PKT 0x08 /* packet mode */
1e6d24b1	47	#define PF_STOPPED 0x10 /* user told stopped */
defdbcd1	48	#define PF_REMOTE 0x20 /* remote and flow controlled input */
0a2bd708	49	#define PF_NOSTOP 0x40
5bb90914	50	#define PF_UCNTL 0x80 /* user control mode */
45372428 MT	51
	52	/ARGSUSED/
	53	ptsopen(dev, flag)
73c77d38	54	dev_t dev;
e1d74936	55	{
45372428	56	register struct tty *tp;
5bb90914	57	int error;
45372428	58
5bb90914 JB	59	#ifdef lint
	60	npty = npty;
	61	#endif
f21c8fb8 BJ	62	if (minor(dev) >= NPTY)
f21c8fb8 BJ	63	return (ENXIO);
45372428	64	tp = &pt_tty[minor(dev)];
941944c9	65	if ((tp->t_state & TS_ISOPEN) == 0) {
bdda6b91	66	ttychars(tp); /* Set up default chars */
d2f24af0	67	tp->t_ispeed = tp->t_ospeed = EXTB;
bdda6b91	68	tp->t_flags = 0; /* No features (nor raw mode) */
f21c8fb8 BJ	69	} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0)
f21c8fb8 BJ	70	return (EBUSY);
e1d74936	71	if (tp->t_oproc) /* Ctrlr still around. */
941944c9 BJ	72	tp->t_state \|= TS_CARR_ON;
	73	while ((tp->t_state & TS_CARR_ON) == 0) {
	74	tp->t_state \|= TS_WOPEN;
45372428 MT	75	sleep((caddr_t)&tp->t_rawq, TTIPRI);
45372428 MT	76	}
5bb90914 JB	77	error = (*linesw[tp->t_line].l_open)(dev, tp);
	78	ptcwakeup(tp, FREAD\|FWRITE);
	79	return (error);
45372428 MT	80	}
	81
	82	ptsclose(dev)
73c77d38	83	dev_t dev;
941944c9	84	{
45372428 MT	85	register struct tty *tp;
	86
	87	tp = &pt_tty[minor(dev)];
	88	(*linesw[tp->t_line].l_close)(tp);
4b39cb77	89	ttyclose(tp);
5bb90914	90	ptcwakeup(tp, FREAD\|FWRITE);
45372428 MT	91	}
45372428 MT	92
ae9a0a69	93	ptsread(dev, uio)
73c77d38	94	dev_t dev;
ae9a0a69	95	struct uio *uio;
e1d74936	96	{
defdbcd1 BJ	97	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1 BJ	98	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	99	int error = 0;
defdbcd1 BJ	100
	101	again:
	102	if (pti->pt_flags & PF_REMOTE) {
	103	while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
5bb90914 JB	104	if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) \|\|
5bb90914 JB	105	(u.u_procp->p_sigmask & sigmask(SIGTTIN)) \|\|
defdbcd1 BJ	106	/*
	107	(u.u_procp->p_flag&SDETACH) \|\|
	108	*/
	109	u.u_procp->p_flag&SVFORK)
840510a3	110	return (EIO);
defdbcd1 BJ	111	gsignal(u.u_procp->p_pgrp, SIGTTIN);
defdbcd1 BJ	112	sleep((caddr_t)&lbolt, TTIPRI);
941944c9	113	}
5bb90914	114	if (tp->t_canq.c_cc == 0) {
840510a3 BJ	115	if (tp->t_state & TS_NBIO)
840510a3 BJ	116	return (EWOULDBLOCK);
5bb90914	117	sleep((caddr_t)&tp->t_canq, TTIPRI);
defdbcd1 BJ	118	goto again;
defdbcd1 BJ	119	}
5bb90914 JB	120	while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
5bb90914 JB	121	if (ureadc(getc(&tp->t_canq), uio) < 0) {
840510a3	122	error = EFAULT;
ae9a0a69 BJ	123	break;
ae9a0a69 BJ	124	}
5bb90914 JB	125	if (tp->t_canq.c_cc == 1)
	126	(void) getc(&tp->t_canq);
	127	if (tp->t_canq.c_cc)
840510a3	128	return (error);
defdbcd1 BJ	129	} else
defdbcd1 BJ	130	if (tp->t_oproc)
840510a3	131	error = (*linesw[tp->t_line].l_read)(tp, uio);
5bb90914	132	ptcwakeup(tp, FWRITE);
840510a3	133	return (error);
45372428 MT	134	}
45372428 MT	135
941944c9 BJ	136	/*
	137	* Write to pseudo-tty.
	138	* Wakeups of controlling tty will happen
	139	* indirectly, when tty driver calls ptsstart.
	140	*/
ae9a0a69	141	ptswrite(dev, uio)
73c77d38	142	dev_t dev;
ae9a0a69	143	struct uio *uio;
e1d74936	144	{
45372428 MT	145	register struct tty *tp;
	146
	147	tp = &pt_tty[minor(dev)];
840510a3 BJ	148	if (tp->t_oproc == 0)
	149	return (EIO);
	150	return ((*linesw[tp->t_line].l_write)(tp, uio));
45372428 MT	151	}
45372428 MT	152
941944c9 BJ	153	/*
	154	* Start output on pseudo-tty.
	155	* Wake up process selecting or sleeping for input from controlling tty.
	156	*/
45372428	157	ptsstart(tp)
e1d74936 BJ	158	struct tty *tp;
e1d74936 BJ	159	{
1e6d24b1	160	register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
e1d74936	161
941944c9	162	if (tp->t_state & TS_TTSTOP)
45372428	163	return;
1e6d24b1 BJ	164	if (pti->pt_flags & PF_STOPPED) {
	165	pti->pt_flags &= ~PF_STOPPED;
	166	pti->pt_send = TIOCPKT_START;
	167	}
5bb90914	168	ptcwakeup(tp, FREAD);
d427b3b2 BJ	169	}
d427b3b2 BJ	170
5bb90914	171	ptcwakeup(tp, flag)
d427b3b2 BJ	172	struct tty *tp;
	173	{
	174	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
	175
5bb90914 JB	176	if (flag & FREAD) {
	177	if (pti->pt_selr) {
	178	selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL);
	179	pti->pt_selr = 0;
	180	pti->pt_flags &= ~PF_RCOLL;
	181	}
	182	wakeup((caddr_t)&tp->t_outq.c_cf);
	183	}
	184	if (flag & FWRITE) {
	185	if (pti->pt_selw) {
	186	selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
	187	pti->pt_selw = 0;
	188	pti->pt_flags &= ~PF_WCOLL;
	189	}
	190	wakeup((caddr_t)&tp->t_rawq.c_cf);
e1d74936	191	}
45372428 MT	192	}
	193
	194	/ARGSUSED/
	195	ptcopen(dev, flag)
e1d74936 BJ	196	dev_t dev;
	197	int flag;
	198	{
45372428	199	register struct tty *tp;
1a954a11	200	struct pt_ioctl *pti;
45372428	201
f21c8fb8 BJ	202	if (minor(dev) >= NPTY)
f21c8fb8 BJ	203	return (ENXIO);
45372428	204	tp = &pt_tty[minor(dev)];
f21c8fb8 BJ	205	if (tp->t_oproc)
f21c8fb8 BJ	206	return (EIO);
e1d74936	207	tp->t_oproc = ptsstart;
941944c9	208	if (tp->t_state & TS_WOPEN)
45372428	209	wakeup((caddr_t)&tp->t_rawq);
941944c9	210	tp->t_state \|= TS_CARR_ON;
1a954a11 BJ	211	pti = &pt_ioctl[minor(dev)];
	212	pti->pt_flags = 0;
	213	pti->pt_send = 0;
5bb90914	214	pti->pt_ucntl = 0;
f21c8fb8	215	return (0);
45372428 MT	216	}
	217
	218	ptcclose(dev)
e1d74936 BJ	219	dev_t dev;
e1d74936 BJ	220	{
45372428 MT	221	register struct tty *tp;
	222
	223	tp = &pt_tty[minor(dev)];
941944c9	224	if (tp->t_state & TS_ISOPEN)
45372428	225	gsignal(tp->t_pgrp, SIGHUP);
941944c9	226	tp->t_state &= ~TS_CARR_ON; /* virtual carrier gone */
88a7a62a	227	ttyflush(tp, FREAD\|FWRITE);
e1d74936	228	tp->t_oproc = 0; /* mark closed */
45372428 MT	229	}
45372428 MT	230
ae9a0a69	231	ptcread(dev, uio)
1a954a11	232	dev_t dev;
ae9a0a69	233	struct uio *uio;
e1d74936	234	{
840510a3	235	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914	236	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
2bb0bef9 SL	237	char buf[BUFSIZ];
2bb0bef9 SL	238	int error = 0, cc;
45372428	239
5bb90914 JB	240	/*
	241	* We want to block until the slave
	242	* is open, and there's something to read;
	243	* but if we lost the slave or we're NBIO,
	244	* then return the appropriate error instead.
	245	*/
	246	for (;;) {
	247	if (tp->t_state&TS_ISOPEN) {
	248	if (pti->pt_flags&PF_PKT && pti->pt_send) {
	249	error = ureadc(pti->pt_send, uio);
	250	if (error)
	251	return (error);
	252	pti->pt_send = 0;
	253	return (0);
	254	}
	255	if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
	256	error = ureadc(pti->pt_ucntl, uio);
	257	if (error)
	258	return (error);
	259	pti->pt_ucntl = 0;
	260	return (0);
	261	}
	262	if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
	263	break;
1a954a11	264	}
2bb0bef9 SL	265	if ((tp->t_state&TS_CARR_ON) == 0)
2bb0bef9 SL	266	return (EIO);
840510a3 BJ	267	if (pti->pt_flags&PF_NBIO)
840510a3 BJ	268	return (EWOULDBLOCK);
45372428	269	sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
8b8271ac	270	}
5bb90914 JB	271	if (pti->pt_flags & (PF_PKT\|PF_UCNTL))
5bb90914 JB	272	error = ureadc(0, uio);
2bb0bef9 SL	273	while (uio->uio_resid > 0 && error == 0) {
	274	cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
	275	if (cc <= 0)
ae9a0a69	276	break;
2bb0bef9 SL	277	error = uiomove(buf, cc, UIO_READ, uio);
2bb0bef9 SL	278	}
941944c9 BJ	279	if (tp->t_outq.c_cc <= TTLOWAT(tp)) {
	280	if (tp->t_state&TS_ASLEEP) {
	281	tp->t_state &= ~TS_ASLEEP;
	282	wakeup((caddr_t)&tp->t_outq);
	283	}
	284	if (tp->t_wsel) {
	285	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
	286	tp->t_wsel = 0;
	287	tp->t_state &= ~TS_WCOLL;
	288	}
45372428	289	}
840510a3	290	return (error);
45372428 MT	291	}
45372428 MT	292
1a954a11 BJ	293	ptsstop(tp, flush)
	294	register struct tty *tp;
	295	int flush;
	296	{
	297	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
5bb90914	298	int flag;
1a954a11	299
1e6d24b1 BJ	300	/* note: FLUSHREAD and FLUSHWRITE already ok */
	301	if (flush == 0) {
	302	flush = TIOCPKT_STOP;
	303	pti->pt_flags \|= PF_STOPPED;
5bb90914	304	} else
1e6d24b1	305	pti->pt_flags &= ~PF_STOPPED;
0a2bd708	306	pti->pt_send \|= flush;
5bb90914 JB	307	/* change of perspective */
	308	flag = 0;
	309	if (flush & FREAD)
	310	flag \|= FWRITE;
	311	if (flush & FWRITE)
	312	flag \|= FREAD;
	313	ptcwakeup(tp, flush);
1a954a11 BJ	314	}
1a954a11 BJ	315
941944c9	316	ptcselect(dev, rw)
e1d74936	317	dev_t dev;
941944c9	318	int rw;
e1d74936 BJ	319	{
e1d74936 BJ	320	register struct tty *tp = &pt_tty[minor(dev)];
defdbcd1	321	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
e1d74936	322	struct proc *p;
d427b3b2	323	int s;
e1d74936	324
5bb90914	325	if ((tp->t_state&TS_CARR_ON) == 0)
e1d74936	326	return (1);
d427b3b2	327	s = spl5();
941944c9 BJ	328	switch (rw) {
	329
	330	case FREAD:
5bb90914 JB	331	if ((tp->t_state&TS_ISOPEN) &&
	332	(pti->pt_flags&PF_PKT && pti->pt_send \|\|
	333	pti->pt_flags&PF_UCNTL && pti->pt_ucntl \|\|
	334	tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)) {
d427b3b2	335	splx(s);
941944c9	336	return (1);
d427b3b2	337	}
1a954a11 BJ	338	if ((p = pti->pt_selr) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	339	pti->pt_flags \|= PF_RCOLL;
941944c9	340	else
1a954a11	341	pti->pt_selr = u.u_procp;
d427b3b2	342	break;
941944c9 BJ	343
941944c9 BJ	344	case FWRITE:
5bb90914	345	if ((tp->t_state&TS_ISOPEN) &&
d19cae27	346	((pti->pt_flags&PF_REMOTE) == 0 \|\| tp->t_canq.c_cc == 0)) {
d427b3b2	347	splx(s);
941944c9	348	return (1);
d427b3b2	349	}
1a954a11 BJ	350	if ((p = pti->pt_selw) && p->p_wchan == (caddr_t)&selwait)
1a954a11 BJ	351	pti->pt_flags \|= PF_WCOLL;
941944c9	352	else
1a954a11	353	pti->pt_selw = u.u_procp;
d427b3b2	354	break;
941944c9	355	}
d427b3b2 BJ	356	splx(s);
d427b3b2 BJ	357	return (0);
e1d74936 BJ	358	}
e1d74936 BJ	359
ae9a0a69	360	ptcwrite(dev, uio)
941944c9	361	dev_t dev;
5bb90914	362	register struct uio *uio;
e1d74936	363	{
840510a3	364	register struct tty *tp = &pt_tty[minor(dev)];
5bb90914 JB	365	register struct iovec *iov;
	366	register char *cp;
	367	register int cc = 0;
45372428	368	char locbuf[BUFSIZ];
941944c9	369	int cnt = 0;
defdbcd1	370	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
840510a3	371	int error = 0;
45372428	372
defdbcd1	373	again:
5bb90914 JB	374	if ((tp->t_state&TS_ISOPEN) == 0)
	375	goto block;
	376	if (cnt == 0 && pti->pt_flags & PF_REMOTE) {
	377	if (uio->uio_iovcnt <= 0)
840510a3	378	return (0);
5bb90914 JB	379	if (tp->t_canq.c_cc)
	380	goto block;
	381	iov = uio->uio_iov;
	382	if (cc == 0 && iov->iov_len) {
	383	cc = MIN(iov->iov_len, BUFSIZ);
	384	cp = locbuf;
	385	error = uiomove(cp, cc, UIO_WRITE, uio);
	386	if (error)
	387	return (error);
	388	/* check again for safety */
	389	if ((tp->t_state&TS_ISOPEN) == 0)
	390	return (EIO);
	391	if (tp->t_canq.c_cc)
	392	goto block;
defdbcd1	393	}
5bb90914 JB	394	if (cc)
	395	(void) b_to_q(cp, cc, &tp->t_canq);
	396	(void) putc(0, &tp->t_canq);
	397	ttwakeup(tp);
	398	wakeup((caddr_t)&tp->t_canq);
	399	return (0);
	400	}
	401	while (uio->uio_iovcnt > 0) {
	402	iov = uio->uio_iov;
	403	if (cc == 0) {
	404	if (iov->iov_len == 0) {
	405	uio->uio_iovcnt--;
	406	uio->uio_iov++;
	407	continue;
45372428	408	}
5bb90914 JB	409	cc = MIN(iov->iov_len, BUFSIZ);
	410	cp = locbuf;
	411	error = uiomove(cp, cc, UIO_WRITE, uio);
	412	if (error)
	413	return (error);
	414	/* check again for safety */
	415	if ((tp->t_state&TS_ISOPEN) == 0)
	416	return (EIO);
	417	}
	418	while (--cc >= 0) {
36612a8f	419	(linesw[tp->t_line].l_rint)(cp++, tp);
941944c9	420	cnt++;
45372428	421	}
5bb90914 JB	422	cc = 0;
	423	}
	424	return (0);
	425	block:
	426	/*
	427	* Come here to wait for slave to open or for space
	428	* in outq.
	429	*/
	430	if ((tp->t_state&TS_CARR_ON) == 0)
	431	return (EIO);
	432	if (pti->pt_flags & PF_NBIO) {
	433	if (cnt == 0)
	434	return (EWOULDBLOCK);
	435	iov->iov_base -= cc;
	436	iov->iov_len += cc;
	437	uio->uio_resid += cc;
	438	uio->uio_offset -= cc;
	439	return (0);
	440	}
	441	sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
	442	goto again;
45372428 MT	443	}
45372428 MT	444
45372428	445	/ARGSUSED/
4b72e2f9 SL	446	ptyioctl(dev, cmd, data, flag)
4b72e2f9 SL	447	caddr_t data;
e1d74936 BJ	448	dev_t dev;
e1d74936 BJ	449	{
0a2bd708 BJ	450	register struct tty *tp = &pt_tty[minor(dev)];
0a2bd708 BJ	451	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
5bb90914	452	int stop, error;
45372428	453
e1d74936	454	/* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG ??? */
4b72e2f9 SL	455	if (cdevsw[major(dev)].d_open == ptcopen)
	456	switch (cmd) {
	457
	458	case TIOCPKT:
5bb90914 JB	459	if ((int )data) {
	460	if (pti->pt_flags & PF_UCNTL)
	461	return (EINVAL);
1a954a11	462	pti->pt_flags \|= PF_PKT;
5bb90914	463	} else
1a954a11	464	pti->pt_flags &= ~PF_PKT;
f21c8fb8	465	return (0);
4b72e2f9	466
5bb90914 JB	467	case TIOCUCNTL:
	468	if ((int )data) {
	469	if (pti->pt_flags & PF_PKT)
	470	return (EINVAL);
	471	pti->pt_flags \|= PF_UCNTL;
	472	} else
	473	pti->pt_flags &= ~PF_UCNTL;
	474	return (0);
	475
4b72e2f9 SL	476	case TIOCREMOTE:
4b72e2f9 SL	477	if ((int )data)
defdbcd1 BJ	478	pti->pt_flags \|= PF_REMOTE;
	479	else
	480	pti->pt_flags &= ~PF_REMOTE;
88a7a62a	481	ttyflush(tp, FREAD\|FWRITE);
f21c8fb8	482	return (0);
4b72e2f9 SL	483
	484	case FIONBIO:
	485	if ((int )data)
1a954a11	486	pti->pt_flags \|= PF_NBIO;
8b8271ac	487	else
1a954a11	488	pti->pt_flags &= ~PF_NBIO;
f21c8fb8	489	return (0);
4b72e2f9 SL	490
	491	case TIOCSETP:
	492	while (getc(&tp->t_outq) >= 0)
	493	;
	494	break;
8b8271ac	495	}
477d62ec	496	error = ttioctl(tp, cmd, data, flag);
5bb90914 JB	497	if (error < 0) {
	498	if (pti->pt_flags & PF_UCNTL &&
	499	(cmd & ~0xff) == _IO(u,0)) {
	500	if (cmd & 0xff) {
	501	pti->pt_ucntl = (u_char)cmd;
	502	ptcwakeup(tp, FREAD);
	503	}
	504	return (0);
	505	}
f21c8fb8	506	error = ENOTTY;
5bb90914 JB	507	}
	508	stop = (tp->t_flags & RAW) == 0 &&
	509	tp->t_stopc == CTRL(s) && tp->t_startc == CTRL(q);
0a2bd708 BJ	510	if (pti->pt_flags & PF_NOSTOP) {
	511	if (stop) {
	512	pti->pt_send &= TIOCPKT_NOSTOP;
	513	pti->pt_send \|= TIOCPKT_DOSTOP;
	514	pti->pt_flags &= ~PF_NOSTOP;
5bb90914	515	ptcwakeup(tp, FREAD);
0a2bd708 BJ	516	}
0a2bd708 BJ	517	} else {
5bb90914	518	if (!stop) {
0a2bd708 BJ	519	pti->pt_send &= ~TIOCPKT_DOSTOP;
	520	pti->pt_send \|= TIOCPKT_NOSTOP;
	521	pti->pt_flags \|= PF_NOSTOP;
5bb90914	522	ptcwakeup(tp, FREAD);
0a2bd708 BJ	523	}
0a2bd708 BJ	524	}
f21c8fb8	525	return (error);
45372428	526	}
4f07e6e5	527	#endif