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freebsd/sys/kern/tty_pty.c
Bruce Evans cf8c7b0963 Added D_TTY to the cdevswitch flags for all tty drivers. This is required
for the Lite2 fix for always returning EIO in dead_read().

Cleaned up the cdevswitch initializers for all tty drivers.

Removed explicit calls to ttsetwater() from all (tty) drivers.  ttsetwater()
is now called centrally for opens, not just for parameter changes.
1998-08-23 08:26:42 +00:00

833 lines
20 KiB
C

/*
* 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 8.4 (Berkeley) 2/20/95
* $Id: tty_pty.c,v 1.53 1998/07/15 12:18:30 bde Exp $
*/
/*
* Pseudo-teletype Driver
* (Actually two drivers, requiring two entries in 'cdevsw')
*/
#include "pty.h" /* XXX */
#include "opt_compat.h"
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
#include <sys/ioctl_compat.h>
#endif
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/poll.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#ifdef notyet
static void ptyattach __P((int n));
#endif
static void ptsstart __P((struct tty *tp));
static void ptcwakeup __P((struct tty *tp, int flag));
static d_open_t ptsopen;
static d_close_t ptsclose;
static d_read_t ptsread;
static d_write_t ptswrite;
static d_ioctl_t ptyioctl;
static d_stop_t ptsstop;
static d_devtotty_t ptydevtotty;
static d_open_t ptcopen;
static d_close_t ptcclose;
static d_read_t ptcread;
static d_write_t ptcwrite;
static d_poll_t ptcpoll;
#define CDEV_MAJOR_S 5
static struct cdevsw pts_cdevsw = {
ptsopen, ptsclose, ptsread, ptswrite,
ptyioctl, ptsstop, nullreset, ptydevtotty,
ttpoll, nommap, NULL, "pts",
NULL, -1, nodump, nopsize,
D_TTY,
};
#define CDEV_MAJOR_C 6
static struct cdevsw ptc_cdevsw = {
ptcopen, ptcclose, ptcread, ptcwrite,
ptyioctl, nullstop, nullreset, ptydevtotty,
ptcpoll, nommap, NULL, "ptc",
NULL, -1, nodump, nopsize,
D_TTY,
};
#if NPTY == 1
#undef NPTY
#define NPTY 32 /* crude XXX */
#warning You have only one pty defined, redefining to 32.
#endif
#ifdef DEVFS
#define MAXUNITS (8 * 32)
static void *devfs_token_pts[MAXUNITS];
static void *devfs_token_ptc[MAXUNITS];
static const char jnames[] = "pqrsPQRS";
#if NPTY > MAXUNITS
#undef NPTY
#define NPTY MAXUNITS
#warning Can't have more than 256 pty's with DEVFS defined.
#endif
#endif
#define BUFSIZ 100 /* Chunk size iomoved to/from user */
/*
* pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
* ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
*/
static struct tty pt_tty[NPTY]; /* XXX */
static struct pt_ioctl {
int pt_flags;
struct selinfo pt_selr, pt_selw;
u_char pt_send;
u_char pt_ucntl;
} pt_ioctl[NPTY]; /* XXX */
static 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 */
#ifdef notyet
/*
* Establish n (or default if n is 1) ptys in the system.
*
* XXX cdevsw & pstat require the array `pty[]' to be an array
*/
static void
ptyattach(n)
int n;
{
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*/
static int
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) {
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;
} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
return (EBUSY);
if (tp->t_oproc) /* Ctrlr still around. */
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
while ((tp->t_state & TS_CARR_ON) == 0) {
if (flag&FNONBLOCK)
break;
error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
"ptsopn", 0);
if (error)
return (error);
}
error = (*linesw[tp->t_line].l_open)(dev, tp);
if (error == 0)
ptcwakeup(tp, FREAD|FWRITE);
return (error);
}
static int
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);
ptsstop(tp, FREAD|FWRITE);
(void) ttyclose(tp);
return (err);
}
static int
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);
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg",
0);
if (error)
return (error);
}
if (tp->t_canq.c_cc == 0) {
if (flag & IO_NDELAY)
return (EWOULDBLOCK);
error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
"ptsin", 0);
if (error)
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.
*/
static int
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.
*/
static 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);
}
static void
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(TSA_PTC_READ(tp));
}
if (flag & FWRITE) {
selwakeup(&pti->pt_selw);
wakeup(TSA_PTC_WRITE(tp));
}
}
static int
ptcopen(dev, flag, devtype, p)
dev_t dev;
int flag, devtype;
struct proc *p;
{
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);
}
static int
ptcclose(dev, flags, fmt, p)
dev_t dev;
int flags;
int fmt;
struct proc *p;
{
register struct tty *tp;
tp = &pt_tty[minor(dev)];
(void)(*linesw[tp->t_line].l_modem)(tp, 0);
/*
* XXX MDMBUF makes no sense for ptys but would inhibit the above
* l_modem(). CLOCAL makes sense but isn't supported. Special
* l_modem()s that ignore carrier drop make no sense for ptys but
* may be in use because other parts of the line discipline make
* sense for ptys. Recover by doing everything that a normal
* ttymodem() would have done except for sending a SIGHUP.
*/
if (tp->t_state & TS_ISOPEN) {
tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
tp->t_state |= TS_ZOMBIE;
ttyflush(tp, FREAD | FWRITE);
}
tp->t_oproc = 0; /* mark closed */
return (0);
}
static int
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((caddr_t)&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_CONNECTED) == 0)
return (0); /* EOF */
if (flag & IO_NDELAY)
return (EWOULDBLOCK);
error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
if (error)
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);
}
ttwwakeup(tp);
return (error);
}
static 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);
}
static int
ptcpoll(dev, events, p)
dev_t dev;
int events;
struct proc *p;
{
register struct tty *tp = &pt_tty[minor(dev)];
struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
int revents = 0;
int s;
if ((tp->t_state & TS_CONNECTED) == 0)
return (seltrue(dev, events, p) | POLLHUP);
/*
* Need to block timeouts (ttrstart).
*/
s = spltty();
if (events & (POLLIN | POLLRDNORM))
if ((tp->t_state & TS_ISOPEN) &&
((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
((pti->pt_flags & PF_PKT) && pti->pt_send) ||
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
revents |= events & (POLLIN | POLLRDNORM);
if (events & (POLLOUT | POLLWRNORM))
if (tp->t_state & TS_ISOPEN &&
((pti->pt_flags & PF_REMOTE) ?
(tp->t_canq.c_cc == 0) :
((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
(tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON)))))
revents |= events & (POLLOUT | POLLWRNORM);
if (events & POLLHUP)
if ((tp->t_state & TS_CARR_ON) == 0)
revents |= POLLHUP;
if (revents == 0) {
if (events & (POLLIN | POLLRDNORM))
selrecord(p, &pti->pt_selr);
if (events & (POLLOUT | POLLWRNORM))
selrecord(p, &pti->pt_selw);
}
splx(s);
return (revents);
}
static int
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 = 0;
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 || cc > 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) {
/* adjust as usual */
uio->uio_resid += cc;
return (EIO);
}
}
if (cc > 0) {
cc = b_to_q((char *)cp, cc, &tp->t_canq);
/*
* XXX we don't guarantee that the canq size
* is >= TTYHOG, so the above b_to_q() may
* leave some bytes uncopied. However, space
* is guaranteed for the null terminator if
* we don't fail here since (TTYHOG - 1) is
* not a multiple of CBSIZE.
*/
if (cc > 0)
break;
}
}
/* adjust for data copied in but not written */
uio->uio_resid += cc;
(void) putc(0, &tp->t_canq);
ttwakeup(tp);
wakeup(TSA_PTS_READ(tp));
return (0);
}
while (uio->uio_resid > 0 || cc > 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) {
/* adjust for data copied in but not written */
uio->uio_resid += cc;
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(TSA_HUP_OR_INPUT(tp));
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, or an empty canq.
*/
if ((tp->t_state & TS_CONNECTED) == 0) {
/* adjust for data copied in but not written */
uio->uio_resid += cc;
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);
}
error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
if (error) {
/* adjust for data copied in but not written */
uio->uio_resid += cc;
return (error);
}
goto again;
}
static struct tty *
ptydevtotty(dev)
dev_t dev;
{
if (minor(dev) >= npty)
return (NULL);
return &pt_tty[minor(dev)];
}
/*ARGSUSED*/
static int
ptyioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long 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_lflag & 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 avoid 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 ||
*(unsigned int *)data == 0)
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 == ENOIOCTL)
error = ttioctl(tp, cmd, data, flag);
if (error == ENOIOCTL) {
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);
}
static int ptc_devsw_installed;
static void ptc_drvinit __P((void *unused));
static void
ptc_drvinit(unused)
void *unused;
{
#ifdef DEVFS
int i,j,k;
#endif
dev_t dev;
if( ! ptc_devsw_installed ) {
dev = makedev(CDEV_MAJOR_S, 0);
cdevsw_add(&dev, &pts_cdevsw, NULL);
dev = makedev(CDEV_MAJOR_C, 0);
cdevsw_add(&dev, &ptc_cdevsw, NULL);
ptc_devsw_installed = 1;
#ifdef DEVFS
for ( i = 0 ; i<NPTY ; i++ ) {
j = i / 32;
k = i % 32;
devfs_token_pts[i] =
devfs_add_devswf(&pts_cdevsw,i,
DV_CHR,0,0,0666,
"tty%c%r",jnames[j],k);
devfs_token_ptc[i] =
devfs_add_devswf(&ptc_cdevsw,i,
DV_CHR,0,0,0666,
"pty%c%r",jnames[j],k);
}
#endif
}
}
SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)