freebsd-skq/sys/kern/tty_pty.c
Peter Wemm e79f2d5bfc Remove cdevsw_add() as the make_dev()'s are done in a clone-like fashion.
(ie: the next device is created with make_dev as the first is opened
and so on)
1999-11-18 06:41:30 +00:00

821 lines
19 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
* $FreeBSD$
*/
/*
* Pseudo-teletype Driver
* (Actually two drivers, requiring two entries in 'cdevsw')
*/
#include "pty.h" /* XXX */
#include "opt_compat.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>
#include <sys/malloc.h>
MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
static void ptsstart __P((struct tty *tp));
static void ptsstop __P((struct tty *tp, int rw));
static void ptcwakeup __P((struct tty *tp, int flag));
static void ptyinit __P((int n));
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_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 = {
/* open */ ptsopen,
/* close */ ptsclose,
/* read */ ptsread,
/* write */ ptswrite,
/* ioctl */ ptyioctl,
/* poll */ ttypoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "pts",
/* maj */ CDEV_MAJOR_S,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_TTY,
/* bmaj */ -1
};
#define CDEV_MAJOR_C 6
static struct cdevsw ptc_cdevsw = {
/* open */ ptcopen,
/* close */ ptcclose,
/* read */ ptcread,
/* write */ ptcwrite,
/* ioctl */ ptyioctl,
/* poll */ ptcpoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "ptc",
/* maj */ CDEV_MAJOR_C,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_TTY,
/* bmaj */ -1
};
#define BUFSIZ 100 /* Chunk size iomoved to/from user */
struct pt_ioctl {
int pt_flags;
struct selinfo pt_selr, pt_selw;
u_char pt_send;
u_char pt_ucntl;
struct tty pt_tty;
dev_t devs, devc;
};
#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 */
/*
* This function creates and initializes a pts/ptc pair
*
* pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
* ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
*
* XXX: define and add mapping of upper minor bits to allow more
* than 256 ptys.
*/
static void
ptyinit(n)
int n;
{
dev_t devs, devc;
char *names = "pqrsPQRS";
struct pt_ioctl *pt;
/* For now we only map the lower 8 bits of the minor */
if (n & ~0xff)
return;
pt = malloc(sizeof(*pt), M_PTY, M_WAITOK);
bzero(pt, sizeof(*pt));
pt->devs = devs = make_dev(&pts_cdevsw, n,
0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
pt->devc = devc = make_dev(&ptc_cdevsw, n,
0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
devs->si_drv1 = devc->si_drv1 = pt;
devs->si_tty = devc->si_tty = &pt->pt_tty;
ttyregister(&pt->pt_tty);
}
/*ARGSUSED*/
static int
ptsopen(dev, flag, devtype, p)
dev_t dev;
int flag, devtype;
struct proc *p;
{
register struct tty *tp;
int error;
int minr;
dev_t nextdev;
/*
* XXX: Gross hack for DEVFS:
* If we openned this device, ensure we have the
* next one too, so people can open it.
*/
minr = lminor(dev);
if (minr < 255) {
nextdev = makedev(major(dev), minr + 1);
if (!nextdev->si_drv1) {
ptyinit(minr + 1);
}
}
if (!dev->si_drv1)
ptyinit(minor(dev));
if (!dev->si_drv1)
return(ENXIO);
tp = dev->si_tty;
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 && suser(p))
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 = dev->si_tty;
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 = dev->si_tty;
register struct pt_ioctl *pti = dev->si_drv1;
int error = 0;
again:
if (pti->pt_flags & PF_REMOTE) {
while (isbackground(p, tp)) {
if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
SIGISMEMBER(p->p_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 = dev->si_tty;
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 = tp->t_dev->si_drv1;
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 = tp->t_dev->si_drv1;
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 (!dev->si_drv1)
ptyinit(minor(dev));
if (!dev->si_drv1)
return(ENXIO);
tp = dev->si_tty;
if (tp->t_oproc)
return (EIO);
tp->t_oproc = ptsstart;
tp->t_stop = ptsstop;
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
tp->t_lflag &= ~EXTPROC;
pti = dev->si_drv1;
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 = dev->si_tty;
(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 = dev->si_tty;
struct pt_ioctl *pti = dev->si_drv1;
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 = tp->t_dev->si_drv1;
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 = dev->si_tty;
struct pt_ioctl *pti = dev->si_drv1;
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 = dev->si_tty;
register u_char *cp = 0;
register int cc = 0;
u_char locbuf[BUFSIZ];
int cnt = 0;
struct pt_ioctl *pti = dev->si_drv1;
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;
}
/*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 = dev->si_tty;
register struct pt_ioctl *pti = dev->si_drv1;
register u_char *cc = tp->t_cc;
int stop, error;
if (devsw(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);
}
/*
* The rest of the ioctls shouldn't be called until
* the slave is open.
*/
if ((tp->t_state & TS_ISOPEN) == 0)
return (EAGAIN);
switch (cmd) {
#ifdef COMPAT_43
case TIOCSETP:
case TIOCSETN:
#endif
case TIOCSETD:
case TIOCSETA:
case TIOCSETAW:
case TIOCSETAF:
/*
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
* ttywflush(tp) will hang if there are characters in
* the outq.
*/
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);
}
}
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);
}
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 void ptc_drvinit __P((void *unused));
static void
ptc_drvinit(unused)
void *unused;
{
/* XXX: Gross hack for DEVFS */
ptyinit(0);
}
SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)