X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/45372428f61e3510eeb7a1306c5e95425eefa20e..668cc26dbe8e6ce075ead3e3cc4590d239277fe0:/usr/src/sys/kern/tty_pty.c

diff --git a/usr/src/sys/kern/tty_pty.c b/usr/src/sys/kern/tty_pty.c
index a7b5af91aa..f16c43820d 100644
--- a/usr/src/sys/kern/tty_pty.c
+++ b/usr/src/sys/kern/tty_pty.c
@@ -1,10 +1,12 @@
-#
+/*	tty_pty.c	4.19	82/03/13	*/
+
 /*
  * Pseudo-teletype Driver
  * (Actually two drivers, requiring two entries in 'cdevsw')
- *
- * Overhauled, and ported to VAX/VMUNIX (V7) Bruce Borden, July 80
  */
+#include "pty.h"
+
+#if NPTY > 0
 #include "../h/param.h"
 #include "../h/systm.h"
 #include "../h/tty.h"
@@ -12,58 +14,64 @@
 #include "../h/user.h"
 #include "../h/conf.h"
 #include "../h/buf.h"
+#include "../h/file.h"
+#include "../h/proc.h"
+#undef	NPTY
+
+#define NPTY 16
+
+#define BUFSIZ 100		/* Chunk size iomoved from user */
 
-#define NPTY 16                 /* Number of pseudo-teletypes */
-#define BUFSIZ 100              /* Chunk size iomoved from user */
-#define ALLDELAYS (NLDELAY|TBDELAY|XTABS|CRDELAY|VTDELAY)
 /*
- * A pseudo-teletype is a special device which is not unlike a pipe.
- * It is used to communicate between two processes.  However, it allows
- * one to simulate a teletype, including mode setting, interrupt, and
- * multiple end of files (all not possible on a pipe).  There are
- * really two drivers here.  One is the device which looks like a TTY
- * and can be thought of as the slave device, and hence its routines
- * are prefixed with 'pts' (PTY Slave).  The other driver can be
- * thought of as the controlling device, and its routines are prefixed
- * by 'ptc' (PTY Controller).  To type on the simulated keyboard of the
- * PTY, one does a 'write' to the controlling device.  To get the
- * simulated printout from the PTY, one does a 'read' on the controlling
- * device.  Normally, the controlling device is called 'ptyx' and the
- * slave device is called 'ttyx' (to make programs like 'who' happy).
+ * pts == /dev/tty[pP]?
+ * ptc == /dev/ptp[pP]?
  */
+struct	tty pt_tty[NPTY];
+struct	pt_ioctl {
+	int	pt_flags;
+	int	pt_gensym;
+	struct	proc *pt_selr, *pt_selw;
+	int	pt_send;
+} pt_ioctl[NPTY];
 
-struct tty pt_tty[NPTY];                /* TTY headers for PTYs */
+#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
 
 /*ARGSUSED*/
 ptsopen(dev, flag)
-dev_t dev;
-{                                       /* Open for PTY Slave */
+	dev_t dev;
+{
 	register struct tty *tp;
 
-	if(minor(dev) >= NPTY) {
+	if (minor(dev) >= NPTY) {
 		u.u_error = ENXIO;
 		return;
 	}
 	tp = &pt_tty[minor(dev)];
-	if((tp->t_state & ISOPEN) == 0) {
-		ttychars(tp);           /* Set up default chars */
-		tp->t_flags = 0;        /* No features (nor raw mode) */
-	} else if(tp->t_state&XCLUDE && u.u_uid != 0) {
+	if ((tp->t_state & TS_ISOPEN) == 0) {
+		ttychars(tp);		/* Set up default chars */
+		tp->t_flags = 0;	/* No features (nor raw mode) */
+	} else if (tp->t_state&TS_XCLUDE && u.u_uid != 0) {
 		u.u_error = EBUSY;
 		return;
 	}
-	if(tp->t_oproc)                 /* Ctrlr still around. */
-		tp->t_state |= CARR_ON;
-	while((tp->t_state & CARR_ON) == 0) {
-		tp->t_state |= WOPEN;
+	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);
 	}
 	(*linesw[tp->t_line].l_open)(dev, tp);
 }
 
 ptsclose(dev)
-dev_t dev;
-{                                       /* Close slave part of PTY */
+	dev_t dev;
+{
 	register struct tty *tp;
 
 	tp = &pt_tty[minor(dev)];
@@ -71,157 +79,356 @@ dev_t dev;
 }
 
 ptsread(dev)
-dev_t dev;
-{       /* Read from PTY, i.e. from data written by controlling device */
-	register struct tty    *tp;
+	dev_t dev;
+{
+	register struct tty *tp = &pt_tty[minor(dev)];
+	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
 
-	tp = &pt_tty[minor(dev)];
-	if(tp->t_oproc) {
-		(*linesw[tp->t_line].l_read)(tp);
-				/* Wakeup other half if sleeping */
-		wakeup((caddr_t)&tp->t_rawq.c_cf);
+again:
+	if (pti->pt_flags & PF_REMOTE) {
+		while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
+			if (u.u_signal[SIGTTIN] == SIG_IGN ||
+			    u.u_signal[SIGTTIN] == SIG_HOLD ||
+	/*
+			    (u.u_procp->p_flag&SDETACH) ||
+	*/
+			    u.u_procp->p_flag&SVFORK)
+				return;
+			gsignal(u.u_procp->p_pgrp, SIGTTIN);
+			sleep((caddr_t)&lbolt, TTIPRI);
+		}
+		if (tp->t_rawq.c_cc == 0) {
+			if (tp->t_state & TS_NBIO) {
+				u.u_error = EWOULDBLOCK;
+				return;
+			}
+			sleep((caddr_t)&tp->t_rawq, TTIPRI);
+			goto again;
+		}
+		while (tp->t_rawq.c_cc > 1 && passc(getc(&tp->t_rawq)) >= 0)
+			;
+		if (tp->t_rawq.c_cc == 1)
+			(void) getc(&tp->t_rawq);
+		if (tp->t_rawq.c_cc)
+			return;
+	} else
+		if (tp->t_oproc)
+			(*linesw[tp->t_line].l_read)(tp);
+	wakeup((caddr_t)&tp->t_rawq.c_cf);
+	if (pti->pt_selw) {
+		selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
+		pti->pt_selw = 0;
+		pti->pt_flags &= ~PF_WCOLL;
 	}
 }
 
+/*
+ * Write to pseudo-tty.
+ * Wakeups of controlling tty will happen
+ * indirectly, when tty driver calls ptsstart.
+ */
 ptswrite(dev)
-dev_t dev;
-{                       /* Write on PTY, i.e. to be read from
-			   controlling device */
+	dev_t dev;
+{
 	register struct tty *tp;
 
 	tp = &pt_tty[minor(dev)];
-			/* Wait for controlling device to be opened */
-	if(tp->t_oproc)
+	if (tp->t_oproc)
 		(*linesw[tp->t_line].l_write)(tp);
 }
 
+/*
+ * Start output on pseudo-tty.
+ * Wake up process selecting or sleeping for input from controlling tty.
+ */
 ptsstart(tp)
-struct tty *tp;
-{                       /* Called by 'ttstart' to output a character.
-			   Merely wakes up controlling half, which
-			   does actual work */
-	if(tp->t_state & TTSTOP)
+	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);
+}
+
+ptcwakeup(tp)
+	struct tty *tp;
+{
+	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+
+	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);
 }
 
 /*ARGSUSED*/
 ptcopen(dev, flag)
-dev_t dev;
-{                               /* Open for PTY Controller */
+	dev_t dev;
+	int flag;
+{
 	register struct tty *tp;
+	struct pt_ioctl *pti;
 
-	if(minor(dev) >= NPTY) {
+	if (minor(dev) >= NPTY) {
 		u.u_error = ENXIO;
 		return;
 	}
 	tp = &pt_tty[minor(dev)];
-	if(tp->t_oproc) {
+	if (tp->t_oproc) {
 		u.u_error = EIO;
 		return;
 	}
-	tp->t_oproc = ptsstart;         /* Set address of start routine */
-	tp->t_iproc = 0;
-	if(tp->t_state & WOPEN)
+	tp->t_oproc = ptsstart;
+	if (tp->t_state & TS_WOPEN)
 		wakeup((caddr_t)&tp->t_rawq);
-	tp->t_state |= CARR_ON;
+	tp->t_state |= TS_CARR_ON;
+	pti = &pt_ioctl[minor(dev)];
+	pti->pt_flags = 0;
+	pti->pt_send = 0;
 }
 
 ptcclose(dev)
-dev_t dev;
-{                                       /* Close controlling part of PTY */
+	dev_t dev;
+{
 	register struct tty *tp;
 
 	tp = &pt_tty[minor(dev)];
-	if(tp->t_state & ISOPEN)
+	if (tp->t_state & TS_ISOPEN)
 		gsignal(tp->t_pgrp, SIGHUP);
-	tp->t_state &= ~CARR_ON;        /* Virtual carrier is gone */
-	flushtty(tp);                   /* Clean things up */
-	tp->t_oproc = 0;                /* Mark as closed */
+	tp->t_state &= ~TS_CARR_ON;	/* virtual carrier gone */
+	flushtty(tp, FREAD|FWRITE);
+	tp->t_oproc = 0;		/* mark closed */
 }
 
 ptcread(dev)
-dev_t dev;
-{                                       /* Read from PTY's output buffer */
+	dev_t dev;
+{
 	register struct tty *tp;
+	struct pt_ioctl *pti;
 
 	tp = &pt_tty[minor(dev)];
-	if((tp->t_state&(CARR_ON|ISOPEN)) == 0)
+	if ((tp->t_state&(TS_CARR_ON|TS_ISOPEN)) == 0)
 		return;
-	while(tp->t_outq.c_cc == 0 ||   /* Wait for something to arrive */
-	      (tp->t_state&TTSTOP))     /* (Woken by ptsstart) */
+	pti = &pt_ioctl[minor(dev)];
+	if (pti->pt_flags & PF_PKT) {
+		if (pti->pt_send) {
+			(void) passc(pti->pt_send);
+			pti->pt_send = 0;
+			return;
+		}
+		(void) passc(0);
+	}
+	while (tp->t_outq.c_cc == 0 || (tp->t_state&TS_TTSTOP)) {
+		if (pti->pt_flags&PF_NBIO) {
+			u.u_error = EWOULDBLOCK;
+			return;
+		}
 		sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
-	while(tp->t_outq.c_cc && passc(getc(&tp->t_outq)) >= 0);
-	if(tp->t_outq.c_cc <= TTLOWAT(tp)  && (tp->t_state&ASLEEP)) {
-		tp->t_state &= ~ASLEEP;
-		if(tp->t_chan)
-			mcstart(tp->t_chan, (caddr_t)&tp->t_outq);
-		else
+	}
+	while (tp->t_outq.c_cc && passc(getc(&tp->t_outq)) >= 0)
+		;
+	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;
+		}
+	}
+}
+
+ptsstop(tp, flush)
+	register struct tty *tp;
+	int flush;
+{
+	struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+
+	/* 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;
+	ptcwakeup(tp);
+}
+
+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|TS_ISOPEN)) == 0)
+		return (1);
+	s = spl5();
+	switch (rw) {
+
+	case FREAD:
+		if (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 ((pti->pt_flags & PF_REMOTE) == 0 || tp->t_rawq.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)
-dev_t dev;
-{                       /* Stuff characters into PTY's input buffer */
+	dev_t dev;
+{
 	register struct tty *tp;
 	register char *cp, *ce;
 	register int cc;
 	char locbuf[BUFSIZ];
+	int cnt = 0;
+	struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
 
 	tp = &pt_tty[minor(dev)];
-	if((tp->t_state&(CARR_ON|ISOPEN)) == 0)
+	if ((tp->t_state&(TS_CARR_ON|TS_ISOPEN)) == 0)
 		return;
-	while(u.u_count) {
+	do {
 		cc = MIN(u.u_count, BUFSIZ);
 		cp = locbuf;
 		iomove(cp, (unsigned)cc, B_WRITE);
-		if(u.u_error)
+		if (u.u_error)
 			break;
 		ce = cp + cc;
-		while(cp < ce) {
-			while(tp->t_delct && tp->t_rawq.c_cc >= TTYHOG - 2) {
+again:
+		if (pti->pt_flags & PF_REMOTE) {
+			if (tp->t_rawq.c_cc) {
+				if (pti->pt_flags & PF_NBIO) {
+					u.u_count += ce - cp;
+					u.u_error = EWOULDBLOCK;
+					return;
+				}
+				sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
+				goto again;
+			}
+			(void) b_to_q(cp, cc, &tp->t_rawq);
+			(void) putc(0, &tp->t_rawq);
+			wakeup((caddr_t)&tp->t_rawq);
+			return;
+		}
+		while (cp < ce) {
+			while (tp->t_delct && tp->t_rawq.c_cc >= TTYHOG - 2) {
 				wakeup((caddr_t)&tp->t_rawq);
+				if (tp->t_state & TS_NBIO) {
+					u.u_count += ce - cp;
+					if (cnt == 0)
+						u.u_error = EWOULDBLOCK;
+					return;
+				}
 				/* Better than just flushing it! */
 				/* Wait for something to be read */
 				sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
+				goto again;
 			}
-			ttyinput(*cp++, tp);
+			(*linesw[tp->t_line].l_rint)(*cp++, tp);
+			cnt++;
 		}
-	}
+	} while (u.u_count);
 }
 
-/* Note: Both slave and controlling device have the same routine for */
-/* 'ioctl' (but note check for controller - 4/12/78:mob)*/
 /*ARGSUSED*/
 ptyioctl(dev, cmd, addr, flag)
-caddr_t addr;
-dev_t dev;
-{					/* Read and write status bits */
-	register struct tty *tp;
-	register int tbd;
-#ifdef BLAND
-	register int nld;
-#endif
+	caddr_t addr;
+	dev_t dev;
+{
+	register struct tty *tp = &pt_tty[minor(dev)];
+	register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
 
-	tp = &pt_tty[minor(dev)];
-		/* if controller stty then must flush to prevent a hang */
-	if(cdevsw[major(dev)].d_open == ptcopen && cmd == TIOCSETP)
-		while(getc(&tp->t_outq) >= 0);
-	if(ttioctl(tp, cmd, addr, dev)) {
-		if(cmd == TIOCSETP || cmd == TIOCSETN) {
-#ifdef BLAND
-			nld = tp->t_flags & NLDELAY;
-#endif
-			tbd = tp->t_flags & TBDELAY;
-			tp->t_flags &= ~ALLDELAYS;
-			if(tbd == TBDELAY)      /* Wants tab expansion */
-				tp->t_flags |= tbd;
-#ifdef BLAND
-			if(nld == NLDELAY)      /* Allow ANN ARBOR mode. */
-				tp->t_flags |= nld;
-#endif
+	/* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG ??? */
+	if (cdevsw[major(dev)].d_open == ptcopen) {
+		if (cmd == TIOCPKT) {
+			int packet;
+			if (copyin((caddr_t)addr, (caddr_t)&packet, sizeof (packet))) {
+				u.u_error = EFAULT;
+				return;
+			}
+			if (packet)
+				pti->pt_flags |= PF_PKT;
+			else
+				pti->pt_flags &= ~PF_PKT;
+			return;
 		}
-	} else
+		if (cmd == TIOCREMOTE) {
+			int remote;
+			if (copyin((caddr_t)addr, (caddr_t)&remote, sizeof (remote))) {
+				u.u_error = EFAULT;
+				return;
+			}
+			if (remote)
+				pti->pt_flags |= PF_REMOTE;
+			else
+				pti->pt_flags &= ~PF_REMOTE;
+			flushtty(tp, FREAD|FWRITE);
+			return;
+		}
+		if (cmd == FIONBIO) {
+			int nbio;
+			if (copyin((caddr_t)addr, (caddr_t)&nbio, sizeof (nbio))) {
+				u.u_error = EFAULT;
+				return;
+			}
+			if (nbio)
+				pti->pt_flags |= PF_NBIO;
+			else
+				pti->pt_flags &= ~PF_NBIO;
+			return;
+		}
+		if (cmd == TIOCSETP)
+			while (getc(&tp->t_outq) >= 0);
+	}
+	if (ttioctl(tp, cmd, addr, dev) == 0)
 		u.u_error = ENOTTY;
+	{ int stop = (tp->t_un.t_chr.t_stopc == ('s'&037) &&
+		      tp->t_un.t_chr.t_startc == ('q'&037));
+	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);
+		}
+	} else {
+		if (stop == 0) {
+			pti->pt_send &= ~TIOCPKT_DOSTOP;
+			pti->pt_send |= TIOCPKT_NOSTOP;
+			pti->pt_flags |= PF_NOSTOP;
+			ptcwakeup(tp);
+		}
+	}
+	}
 }
+#endif