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-rw-r--r--sys/kern/tty_pty.c691
1 files changed, 691 insertions, 0 deletions
diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c
new file mode 100644
index 0000000..0e6911b
--- /dev/null
+++ b/sys/kern/tty_pty.c
@@ -0,0 +1,691 @@
+/*
+ * Copyright (c) 1982, 1986, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)tty_pty.c 8.2 (Berkeley) 9/23/93
+ */
+
+/*
+ * 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>
+
+#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;
+} pt_ioctl[NPTY]; /* XXX */
+int npty = NPTY; /* for pstat -t */
+
+#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 */
+
+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);
+}
+
+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 & P_PPWAIT)
+ 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;
+
+ tp = &pt_tty[minor(dev)];
+ if (tp->t_oproc == 0)
+ return (EIO);
+ return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
+}
+
+/*
+ * Start output on pseudo-tty.
+ * Wake up process selecting or sleeping for input from controlling tty.
+ */
+void
+ptsstart(tp)
+ struct tty *tp;
+{
+ register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+
+ if (tp->t_state & TS_TTSTOP)
+ return;
+ if (pti->pt_flags & PF_STOPPED) {
+ pti->pt_flags &= ~PF_STOPPED;
+ pti->pt_send = TIOCPKT_START;
+ }
+ ptcwakeup(tp, FREAD);
+}
+
+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);
+}
+
+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 (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))
+ 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 <= tp->t_lowat) {
+ if (tp->t_state&TS_ASLEEP) {
+ tp->t_state &= ~TS_ASLEEP;
+ wakeup((caddr_t)&tp->t_outq);
+ }
+ selwakeup(&tp->t_wsel);
+ }
+ return (error);
+}
+
+void
+ptsstop(tp, flush)
+ register struct tty *tp;
+ int flush;
+{
+ struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+ int flag;
+
+ /* note: FLUSHREAD and FLUSHWRITE already ok */
+ if (flush == 0) {
+ flush = TIOCPKT_STOP;
+ pti->pt_flags |= PF_STOPPED;
+ } else
+ pti->pt_flags &= ~PF_STOPPED;
+ pti->pt_send |= flush;
+ /* change of perspective */
+ flag = 0;
+ if (flush & FREAD)
+ flag |= FWRITE;
+ if (flush & FWRITE)
+ flag |= FREAD;
+ ptcwakeup(tp, flag);
+}
+
+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_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, FREAD);
+ }
+ tp->t_lflag |= EXTPROC;
+ } else {
+ if ((tp->t_state & EXTPROC) &&
+ (pti->pt_flags & PF_PKT)) {
+ pti->pt_send |= TIOCPKT_IOCTL;
+ ptcwakeup(tp, FREAD);
+ }
+ tp->t_lflag &= ~EXTPROC;
+ }
+ return(0);
+ } else
+ if (cdevsw[major(dev)].d_open == ptcopen)
+ switch (cmd) {
+
+ case TIOCGPGRP:
+ /*
+ * We aviod calling ttioctl on the controller since,
+ * in that case, tp must be the controlling terminal.
+ */
+ *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
+ return (0);
+
+ case TIOCPKT:
+ if (*(int *)data) {
+ if (pti->pt_flags & PF_UCNTL)
+ return (EINVAL);
+ pti->pt_flags |= PF_PKT;
+ } else
+ pti->pt_flags &= ~PF_PKT;
+ return (0);
+
+ case TIOCUCNTL:
+ if (*(int *)data) {
+ if (pti->pt_flags & PF_PKT)
+ return (EINVAL);
+ pti->pt_flags |= PF_UCNTL;
+ } else
+ pti->pt_flags &= ~PF_UCNTL;
+ return (0);
+
+ case TIOCREMOTE:
+ if (*(int *)data)
+ pti->pt_flags |= PF_REMOTE;
+ else
+ pti->pt_flags &= ~PF_REMOTE;
+ ttyflush(tp, FREAD|FWRITE);
+ return (0);
+
+#ifdef COMPAT_43
+ 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);
+ }
+ 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;
+ ptcwakeup(tp, FREAD);
+ 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);
+}
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