to fail and return error. - Use make_dev_p() in tty_makedevf() instead of make_dev_cred(). - Always pass MAKEDEV_CHECKNAME flag. - Optionally pass MAKEDEV_REF flag. - Provide macro for compatibility with old API. This fixes races with simultaneous creation and desctruction of ttys, and makes it possible to call tty_makedevf() from device cloners. A race in tty_watermarks() still exist, since the latter drops lock for M_WAITOK allocation. This will be addressed in separate commit. Reviewed by: kib Sponsored by: Nginx, Inc.
2249 lines
50 KiB
C
2249 lines
50 KiB
C
/*-
|
|
* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed under sponsorship from Snow
|
|
* B.V., the Netherlands.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_capsicum.h"
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/capability.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/cons.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/filio.h>
|
|
#ifdef COMPAT_43TTY
|
|
#include <sys/ioctl_compat.h>
|
|
#endif /* COMPAT_43TTY */
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/serial.h>
|
|
#include <sys/signal.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/ttycom.h>
|
|
#define TTYDEFCHARS
|
|
#include <sys/ttydefaults.h>
|
|
#undef TTYDEFCHARS
|
|
#include <sys/ucred.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
static MALLOC_DEFINE(M_TTY, "tty", "tty device");
|
|
|
|
static void tty_rel_free(struct tty *tp);
|
|
|
|
static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
|
|
static struct sx tty_list_sx;
|
|
SX_SYSINIT(tty_list, &tty_list_sx, "tty list");
|
|
static unsigned int tty_list_count = 0;
|
|
|
|
/* Character device of /dev/console. */
|
|
static struct cdev *dev_console;
|
|
static const char *dev_console_filename;
|
|
|
|
/*
|
|
* Flags that are supported and stored by this implementation.
|
|
*/
|
|
#define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
|
|
INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
|
|
#define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
|
|
#define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
|
|
ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
|
|
FLUSHO|NOKERNINFO|NOFLSH)
|
|
#define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\
|
|
HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\
|
|
CDSR_OFLOW|CCAR_OFLOW)
|
|
|
|
#define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT)
|
|
|
|
/*
|
|
* Set TTY buffer sizes.
|
|
*/
|
|
|
|
#define TTYBUF_MAX 65536
|
|
|
|
static void
|
|
tty_watermarks(struct tty *tp)
|
|
{
|
|
size_t bs = 0;
|
|
|
|
/* Provide an input buffer for 0.2 seconds of data. */
|
|
if (tp->t_termios.c_cflag & CREAD)
|
|
bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX);
|
|
ttyinq_setsize(&tp->t_inq, tp, bs);
|
|
|
|
/* Set low watermark at 10% (when 90% is available). */
|
|
tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10;
|
|
|
|
/* Provide an output buffer for 0.2 seconds of data. */
|
|
bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX);
|
|
ttyoutq_setsize(&tp->t_outq, tp, bs);
|
|
|
|
/* Set low watermark at 10% (when 90% is available). */
|
|
tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10;
|
|
}
|
|
|
|
static int
|
|
tty_drain(struct tty *tp)
|
|
{
|
|
int error;
|
|
|
|
if (ttyhook_hashook(tp, getc_inject))
|
|
/* buffer is inaccessible */
|
|
return (0);
|
|
|
|
while (ttyoutq_bytesused(&tp->t_outq) > 0) {
|
|
ttydevsw_outwakeup(tp);
|
|
/* Could be handled synchronously. */
|
|
if (ttyoutq_bytesused(&tp->t_outq) == 0)
|
|
return (0);
|
|
|
|
/* Wait for data to be drained. */
|
|
error = tty_wait(tp, &tp->t_outwait);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Though ttydev_enter() and ttydev_leave() seem to be related, they
|
|
* don't have to be used together. ttydev_enter() is used by the cdev
|
|
* operations to prevent an actual operation from being processed when
|
|
* the TTY has been abandoned. ttydev_leave() is used by ttydev_open()
|
|
* and ttydev_close() to determine whether per-TTY data should be
|
|
* deallocated.
|
|
*/
|
|
|
|
static __inline int
|
|
ttydev_enter(struct tty *tp)
|
|
{
|
|
tty_lock(tp);
|
|
|
|
if (tty_gone(tp) || !tty_opened(tp)) {
|
|
/* Device is already gone. */
|
|
tty_unlock(tp);
|
|
return (ENXIO);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ttydev_leave(struct tty *tp)
|
|
{
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
|
|
/* Device is still opened somewhere. */
|
|
tty_unlock(tp);
|
|
return;
|
|
}
|
|
|
|
tp->t_flags |= TF_OPENCLOSE;
|
|
|
|
/* Stop asynchronous I/O. */
|
|
funsetown(&tp->t_sigio);
|
|
|
|
/* Remove console TTY. */
|
|
if (constty == tp)
|
|
constty_clear();
|
|
|
|
/* Drain any output. */
|
|
MPASS((tp->t_flags & TF_STOPPED) == 0);
|
|
if (!tty_gone(tp)) {
|
|
while (tty_drain(tp) == ERESTART)
|
|
;
|
|
}
|
|
|
|
ttydisc_close(tp);
|
|
|
|
/* Destroy associated buffers already. */
|
|
ttyinq_free(&tp->t_inq);
|
|
tp->t_inlow = 0;
|
|
ttyoutq_free(&tp->t_outq);
|
|
tp->t_outlow = 0;
|
|
|
|
knlist_clear(&tp->t_inpoll.si_note, 1);
|
|
knlist_clear(&tp->t_outpoll.si_note, 1);
|
|
|
|
if (!tty_gone(tp))
|
|
ttydevsw_close(tp);
|
|
|
|
tp->t_flags &= ~TF_OPENCLOSE;
|
|
cv_broadcast(&tp->t_dcdwait);
|
|
tty_rel_free(tp);
|
|
}
|
|
|
|
/*
|
|
* Operations that are exposed through the character device in /dev.
|
|
*/
|
|
static int
|
|
ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
|
|
{
|
|
struct tty *tp;
|
|
int error = 0;
|
|
|
|
while ((tp = dev->si_drv1) == NULL) {
|
|
error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
|
|
if (error != EWOULDBLOCK)
|
|
return (error);
|
|
}
|
|
|
|
tty_lock(tp);
|
|
if (tty_gone(tp)) {
|
|
/* Device is already gone. */
|
|
tty_unlock(tp);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/*
|
|
* Block when other processes are currently opening or closing
|
|
* the TTY.
|
|
*/
|
|
while (tp->t_flags & TF_OPENCLOSE) {
|
|
error = tty_wait(tp, &tp->t_dcdwait);
|
|
if (error != 0) {
|
|
tty_unlock(tp);
|
|
return (error);
|
|
}
|
|
}
|
|
tp->t_flags |= TF_OPENCLOSE;
|
|
|
|
/*
|
|
* Make sure the "tty" and "cua" device cannot be opened at the
|
|
* same time.
|
|
*/
|
|
if (TTY_CALLOUT(tp, dev)) {
|
|
if (tp->t_flags & TF_OPENED_IN) {
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
} else {
|
|
if (tp->t_flags & TF_OPENED_OUT) {
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
|
|
error = EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
if (!tty_opened(tp)) {
|
|
/* Set proper termios flags. */
|
|
if (TTY_CALLOUT(tp, dev))
|
|
tp->t_termios = tp->t_termios_init_out;
|
|
else
|
|
tp->t_termios = tp->t_termios_init_in;
|
|
ttydevsw_param(tp, &tp->t_termios);
|
|
/* Prevent modem control on callout devices and /dev/console. */
|
|
if (TTY_CALLOUT(tp, dev) || dev == dev_console)
|
|
tp->t_termios.c_cflag |= CLOCAL;
|
|
|
|
ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
|
|
|
|
error = ttydevsw_open(tp);
|
|
if (error != 0)
|
|
goto done;
|
|
|
|
ttydisc_open(tp);
|
|
tty_watermarks(tp); /* XXXGL: drops lock */
|
|
}
|
|
|
|
/* Wait for Carrier Detect. */
|
|
if ((oflags & O_NONBLOCK) == 0 &&
|
|
(tp->t_termios.c_cflag & CLOCAL) == 0) {
|
|
while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
|
|
error = tty_wait(tp, &tp->t_dcdwait);
|
|
if (error != 0)
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (dev == dev_console)
|
|
tp->t_flags |= TF_OPENED_CONS;
|
|
else if (TTY_CALLOUT(tp, dev))
|
|
tp->t_flags |= TF_OPENED_OUT;
|
|
else
|
|
tp->t_flags |= TF_OPENED_IN;
|
|
|
|
done: tp->t_flags &= ~TF_OPENCLOSE;
|
|
cv_broadcast(&tp->t_dcdwait);
|
|
ttydev_leave(tp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
|
|
tty_lock(tp);
|
|
|
|
/*
|
|
* Don't actually close the device if it is being used as the
|
|
* console.
|
|
*/
|
|
MPASS((tp->t_flags & TF_OPENED) != TF_OPENED);
|
|
if (dev == dev_console)
|
|
tp->t_flags &= ~TF_OPENED_CONS;
|
|
else
|
|
tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
|
|
|
|
if (tp->t_flags & TF_OPENED) {
|
|
tty_unlock(tp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This can only be called once. The callin and the callout
|
|
* devices cannot be opened at the same time.
|
|
*/
|
|
tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED);
|
|
|
|
/* Properly wake up threads that are stuck - revoke(). */
|
|
tp->t_revokecnt++;
|
|
tty_wakeup(tp, FREAD|FWRITE);
|
|
cv_broadcast(&tp->t_bgwait);
|
|
cv_broadcast(&tp->t_dcdwait);
|
|
|
|
ttydev_leave(tp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
tty_is_ctty(struct tty *tp, struct proc *p)
|
|
{
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
|
|
}
|
|
|
|
int
|
|
tty_wait_background(struct tty *tp, struct thread *td, int sig)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct pgrp *pg;
|
|
ksiginfo_t ksi;
|
|
int error;
|
|
|
|
MPASS(sig == SIGTTIN || sig == SIGTTOU);
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
for (;;) {
|
|
PROC_LOCK(p);
|
|
/*
|
|
* The process should only sleep, when:
|
|
* - This terminal is the controling terminal
|
|
* - Its process group is not the foreground process
|
|
* group
|
|
* - The parent process isn't waiting for the child to
|
|
* exit
|
|
* - the signal to send to the process isn't masked
|
|
*/
|
|
if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
|
|
/* Allow the action to happen. */
|
|
PROC_UNLOCK(p);
|
|
return (0);
|
|
}
|
|
|
|
if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
|
|
SIGISMEMBER(td->td_sigmask, sig)) {
|
|
/* Only allow them in write()/ioctl(). */
|
|
PROC_UNLOCK(p);
|
|
return (sig == SIGTTOU ? 0 : EIO);
|
|
}
|
|
|
|
pg = p->p_pgrp;
|
|
if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
|
|
/* Don't allow the action to happen. */
|
|
PROC_UNLOCK(p);
|
|
return (EIO);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Send the signal and sleep until we're the new
|
|
* foreground process group.
|
|
*/
|
|
if (sig != 0) {
|
|
ksiginfo_init(&ksi);
|
|
ksi.ksi_code = SI_KERNEL;
|
|
ksi.ksi_signo = sig;
|
|
sig = 0;
|
|
}
|
|
PGRP_LOCK(pg);
|
|
pgsignal(pg, ksi.ksi_signo, 1, &ksi);
|
|
PGRP_UNLOCK(pg);
|
|
|
|
error = tty_wait(tp, &tp->t_bgwait);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
static int
|
|
ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
goto done;
|
|
error = ttydisc_read(tp, uio, ioflag);
|
|
tty_unlock(tp);
|
|
|
|
/*
|
|
* The read() call should not throw an error when the device is
|
|
* being destroyed. Silently convert it to an EOF.
|
|
*/
|
|
done: if (error == ENXIO)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (tp->t_termios.c_lflag & TOSTOP) {
|
|
error = tty_wait_background(tp, curthread, SIGTTOU);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
|
|
/* Allow non-blocking writes to bypass serialization. */
|
|
error = ttydisc_write(tp, uio, ioflag);
|
|
} else {
|
|
/* Serialize write() calls. */
|
|
while (tp->t_flags & TF_BUSY_OUT) {
|
|
error = tty_wait(tp, &tp->t_outserwait);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
tp->t_flags |= TF_BUSY_OUT;
|
|
error = ttydisc_write(tp, uio, ioflag);
|
|
tp->t_flags &= ~TF_BUSY_OUT;
|
|
cv_signal(&tp->t_outserwait);
|
|
}
|
|
|
|
done: tty_unlock(tp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
|
|
struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (cmd) {
|
|
case TIOCCBRK:
|
|
case TIOCCONS:
|
|
case TIOCDRAIN:
|
|
case TIOCEXCL:
|
|
case TIOCFLUSH:
|
|
case TIOCNXCL:
|
|
case TIOCSBRK:
|
|
case TIOCSCTTY:
|
|
case TIOCSETA:
|
|
case TIOCSETAF:
|
|
case TIOCSETAW:
|
|
case TIOCSPGRP:
|
|
case TIOCSTART:
|
|
case TIOCSTAT:
|
|
case TIOCSTI:
|
|
case TIOCSTOP:
|
|
case TIOCSWINSZ:
|
|
#if 0
|
|
case TIOCSDRAINWAIT:
|
|
case TIOCSETD:
|
|
#endif
|
|
#ifdef COMPAT_43TTY
|
|
case TIOCLBIC:
|
|
case TIOCLBIS:
|
|
case TIOCLSET:
|
|
case TIOCSETC:
|
|
case OTIOCSETD:
|
|
case TIOCSETN:
|
|
case TIOCSETP:
|
|
case TIOCSLTC:
|
|
#endif /* COMPAT_43TTY */
|
|
/*
|
|
* If the ioctl() causes the TTY to be modified, let it
|
|
* wait in the background.
|
|
*/
|
|
error = tty_wait_background(tp, curthread, SIGTTOU);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
|
|
struct termios *old = &tp->t_termios;
|
|
struct termios *new = (struct termios *)data;
|
|
struct termios *lock = TTY_CALLOUT(tp, dev) ?
|
|
&tp->t_termios_lock_out : &tp->t_termios_lock_in;
|
|
int cc;
|
|
|
|
/*
|
|
* Lock state devices. Just overwrite the values of the
|
|
* commands that are currently in use.
|
|
*/
|
|
new->c_iflag = (old->c_iflag & lock->c_iflag) |
|
|
(new->c_iflag & ~lock->c_iflag);
|
|
new->c_oflag = (old->c_oflag & lock->c_oflag) |
|
|
(new->c_oflag & ~lock->c_oflag);
|
|
new->c_cflag = (old->c_cflag & lock->c_cflag) |
|
|
(new->c_cflag & ~lock->c_cflag);
|
|
new->c_lflag = (old->c_lflag & lock->c_lflag) |
|
|
(new->c_lflag & ~lock->c_lflag);
|
|
for (cc = 0; cc < NCCS; ++cc)
|
|
if (lock->c_cc[cc])
|
|
new->c_cc[cc] = old->c_cc[cc];
|
|
if (lock->c_ispeed)
|
|
new->c_ispeed = old->c_ispeed;
|
|
if (lock->c_ospeed)
|
|
new->c_ospeed = old->c_ospeed;
|
|
}
|
|
|
|
error = tty_ioctl(tp, cmd, data, fflag, td);
|
|
done: tty_unlock(tp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ttydev_poll(struct cdev *dev, int events, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error, revents = 0;
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
|
|
|
|
if (events & (POLLIN|POLLRDNORM)) {
|
|
/* See if we can read something. */
|
|
if (ttydisc_read_poll(tp) > 0)
|
|
revents |= events & (POLLIN|POLLRDNORM);
|
|
}
|
|
|
|
if (tp->t_flags & TF_ZOMBIE) {
|
|
/* Hangup flag on zombie state. */
|
|
revents |= POLLHUP;
|
|
} else if (events & (POLLOUT|POLLWRNORM)) {
|
|
/* See if we can write something. */
|
|
if (ttydisc_write_poll(tp) > 0)
|
|
revents |= events & (POLLOUT|POLLWRNORM);
|
|
}
|
|
|
|
if (revents == 0) {
|
|
if (events & (POLLIN|POLLRDNORM))
|
|
selrecord(td, &tp->t_inpoll);
|
|
if (events & (POLLOUT|POLLWRNORM))
|
|
selrecord(td, &tp->t_outpoll);
|
|
}
|
|
|
|
tty_unlock(tp);
|
|
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
|
|
int nprot, vm_memattr_t *memattr)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
/* Handle mmap() through the driver. */
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
return (-1);
|
|
error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr);
|
|
tty_unlock(tp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* kqueue support.
|
|
*/
|
|
|
|
static void
|
|
tty_kqops_read_detach(struct knote *kn)
|
|
{
|
|
struct tty *tp = kn->kn_hook;
|
|
|
|
knlist_remove(&tp->t_inpoll.si_note, kn, 0);
|
|
}
|
|
|
|
static int
|
|
tty_kqops_read_event(struct knote *kn, long hint)
|
|
{
|
|
struct tty *tp = kn->kn_hook;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
} else {
|
|
kn->kn_data = ttydisc_read_poll(tp);
|
|
return (kn->kn_data > 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tty_kqops_write_detach(struct knote *kn)
|
|
{
|
|
struct tty *tp = kn->kn_hook;
|
|
|
|
knlist_remove(&tp->t_outpoll.si_note, kn, 0);
|
|
}
|
|
|
|
static int
|
|
tty_kqops_write_event(struct knote *kn, long hint)
|
|
{
|
|
struct tty *tp = kn->kn_hook;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
if (tty_gone(tp)) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
} else {
|
|
kn->kn_data = ttydisc_write_poll(tp);
|
|
return (kn->kn_data > 0);
|
|
}
|
|
}
|
|
|
|
static struct filterops tty_kqops_read = {
|
|
.f_isfd = 1,
|
|
.f_detach = tty_kqops_read_detach,
|
|
.f_event = tty_kqops_read_event,
|
|
};
|
|
static struct filterops tty_kqops_write = {
|
|
.f_isfd = 1,
|
|
.f_detach = tty_kqops_write_detach,
|
|
.f_event = tty_kqops_write_event,
|
|
};
|
|
|
|
static int
|
|
ttydev_kqfilter(struct cdev *dev, struct knote *kn)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
error = ttydev_enter(tp);
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
kn->kn_hook = tp;
|
|
kn->kn_fop = &tty_kqops_read;
|
|
knlist_add(&tp->t_inpoll.si_note, kn, 1);
|
|
break;
|
|
case EVFILT_WRITE:
|
|
kn->kn_hook = tp;
|
|
kn->kn_fop = &tty_kqops_write;
|
|
knlist_add(&tp->t_outpoll.si_note, kn, 1);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
tty_unlock(tp);
|
|
return (error);
|
|
}
|
|
|
|
static struct cdevsw ttydev_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = ttydev_open,
|
|
.d_close = ttydev_close,
|
|
.d_read = ttydev_read,
|
|
.d_write = ttydev_write,
|
|
.d_ioctl = ttydev_ioctl,
|
|
.d_kqfilter = ttydev_kqfilter,
|
|
.d_poll = ttydev_poll,
|
|
.d_mmap = ttydev_mmap,
|
|
.d_name = "ttydev",
|
|
.d_flags = D_TTY,
|
|
};
|
|
|
|
/*
|
|
* Init/lock-state devices
|
|
*/
|
|
|
|
static int
|
|
ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
|
|
{
|
|
struct tty *tp;
|
|
int error = 0;
|
|
|
|
while ((tp = dev->si_drv1) == NULL) {
|
|
error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
|
|
if (error != EWOULDBLOCK)
|
|
return (error);
|
|
}
|
|
tty_lock(tp);
|
|
if (tty_gone(tp))
|
|
error = ENODEV;
|
|
tty_unlock(tp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
return (ENODEV);
|
|
}
|
|
|
|
static int
|
|
ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
|
|
struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_drv1;
|
|
int error;
|
|
|
|
tty_lock(tp);
|
|
if (tty_gone(tp)) {
|
|
error = ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td);
|
|
if (error != ENOIOCTL)
|
|
goto done;
|
|
error = 0;
|
|
|
|
switch (cmd) {
|
|
case TIOCGETA:
|
|
/* Obtain terminal flags through tcgetattr(). */
|
|
*(struct termios*)data = *(struct termios*)dev->si_drv2;
|
|
break;
|
|
case TIOCSETA:
|
|
/* Set terminal flags through tcsetattr(). */
|
|
error = priv_check(td, PRIV_TTY_SETA);
|
|
if (error)
|
|
break;
|
|
*(struct termios*)dev->si_drv2 = *(struct termios*)data;
|
|
break;
|
|
case TIOCGETD:
|
|
*(int *)data = TTYDISC;
|
|
break;
|
|
case TIOCGWINSZ:
|
|
bzero(data, sizeof(struct winsize));
|
|
break;
|
|
default:
|
|
error = ENOTTY;
|
|
}
|
|
|
|
done: tty_unlock(tp);
|
|
return (error);
|
|
}
|
|
|
|
static struct cdevsw ttyil_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = ttyil_open,
|
|
.d_close = ttyil_close,
|
|
.d_read = ttyil_rdwr,
|
|
.d_write = ttyil_rdwr,
|
|
.d_ioctl = ttyil_ioctl,
|
|
.d_name = "ttyil",
|
|
.d_flags = D_TTY,
|
|
};
|
|
|
|
static void
|
|
tty_init_termios(struct tty *tp)
|
|
{
|
|
struct termios *t = &tp->t_termios_init_in;
|
|
|
|
t->c_cflag = TTYDEF_CFLAG;
|
|
t->c_iflag = TTYDEF_IFLAG;
|
|
t->c_lflag = TTYDEF_LFLAG;
|
|
t->c_oflag = TTYDEF_OFLAG;
|
|
t->c_ispeed = TTYDEF_SPEED;
|
|
t->c_ospeed = TTYDEF_SPEED;
|
|
memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
|
|
|
|
tp->t_termios_init_out = *t;
|
|
}
|
|
|
|
void
|
|
tty_init_console(struct tty *tp, speed_t s)
|
|
{
|
|
struct termios *ti = &tp->t_termios_init_in;
|
|
struct termios *to = &tp->t_termios_init_out;
|
|
|
|
if (s != 0) {
|
|
ti->c_ispeed = ti->c_ospeed = s;
|
|
to->c_ispeed = to->c_ospeed = s;
|
|
}
|
|
|
|
ti->c_cflag |= CLOCAL;
|
|
to->c_cflag |= CLOCAL;
|
|
}
|
|
|
|
/*
|
|
* Standard device routine implementations, mostly meant for
|
|
* pseudo-terminal device drivers. When a driver creates a new terminal
|
|
* device class, missing routines are patched.
|
|
*/
|
|
|
|
static int
|
|
ttydevsw_defopen(struct tty *tp)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ttydevsw_defclose(struct tty *tp)
|
|
{
|
|
}
|
|
|
|
static void
|
|
ttydevsw_defoutwakeup(struct tty *tp)
|
|
{
|
|
|
|
panic("Terminal device has output, while not implemented");
|
|
}
|
|
|
|
static void
|
|
ttydevsw_definwakeup(struct tty *tp)
|
|
{
|
|
}
|
|
|
|
static int
|
|
ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
|
|
{
|
|
|
|
return (ENOIOCTL);
|
|
}
|
|
|
|
static int
|
|
ttydevsw_defcioctl(struct tty *tp, int unit, u_long cmd, caddr_t data, struct thread *td)
|
|
{
|
|
|
|
return (ENOIOCTL);
|
|
}
|
|
|
|
static int
|
|
ttydevsw_defparam(struct tty *tp, struct termios *t)
|
|
{
|
|
|
|
/*
|
|
* Allow the baud rate to be adjusted for pseudo-devices, but at
|
|
* least restrict it to 115200 to prevent excessive buffer
|
|
* usage. Also disallow 0, to prevent foot shooting.
|
|
*/
|
|
if (t->c_ispeed < B50)
|
|
t->c_ispeed = B50;
|
|
else if (t->c_ispeed > B115200)
|
|
t->c_ispeed = B115200;
|
|
if (t->c_ospeed < B50)
|
|
t->c_ospeed = B50;
|
|
else if (t->c_ospeed > B115200)
|
|
t->c_ospeed = B115200;
|
|
t->c_cflag |= CREAD;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff)
|
|
{
|
|
|
|
/* Simulate a carrier to make the TTY layer happy. */
|
|
return (SER_DCD);
|
|
}
|
|
|
|
static int
|
|
ttydevsw_defmmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr,
|
|
int nprot, vm_memattr_t *memattr)
|
|
{
|
|
|
|
return (-1);
|
|
}
|
|
|
|
static void
|
|
ttydevsw_defpktnotify(struct tty *tp, char event)
|
|
{
|
|
}
|
|
|
|
static void
|
|
ttydevsw_deffree(void *softc)
|
|
{
|
|
|
|
panic("Terminal device freed without a free-handler");
|
|
}
|
|
|
|
/*
|
|
* TTY allocation and deallocation. TTY devices can be deallocated when
|
|
* the driver doesn't use it anymore, when the TTY isn't a session's
|
|
* controlling TTY and when the device node isn't opened through devfs.
|
|
*/
|
|
|
|
struct tty *
|
|
tty_alloc(struct ttydevsw *tsw, void *sc)
|
|
{
|
|
|
|
return (tty_alloc_mutex(tsw, sc, NULL));
|
|
}
|
|
|
|
struct tty *
|
|
tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
|
|
{
|
|
struct tty *tp;
|
|
|
|
/* Make sure the driver defines all routines. */
|
|
#define PATCH_FUNC(x) do { \
|
|
if (tsw->tsw_ ## x == NULL) \
|
|
tsw->tsw_ ## x = ttydevsw_def ## x; \
|
|
} while (0)
|
|
PATCH_FUNC(open);
|
|
PATCH_FUNC(close);
|
|
PATCH_FUNC(outwakeup);
|
|
PATCH_FUNC(inwakeup);
|
|
PATCH_FUNC(ioctl);
|
|
PATCH_FUNC(cioctl);
|
|
PATCH_FUNC(param);
|
|
PATCH_FUNC(modem);
|
|
PATCH_FUNC(mmap);
|
|
PATCH_FUNC(pktnotify);
|
|
PATCH_FUNC(free);
|
|
#undef PATCH_FUNC
|
|
|
|
tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO);
|
|
tp->t_devsw = tsw;
|
|
tp->t_devswsoftc = sc;
|
|
tp->t_flags = tsw->tsw_flags;
|
|
|
|
tty_init_termios(tp);
|
|
|
|
cv_init(&tp->t_inwait, "ttyin");
|
|
cv_init(&tp->t_outwait, "ttyout");
|
|
cv_init(&tp->t_outserwait, "ttyosr");
|
|
cv_init(&tp->t_bgwait, "ttybg");
|
|
cv_init(&tp->t_dcdwait, "ttydcd");
|
|
|
|
/* Allow drivers to use a custom mutex to lock the TTY. */
|
|
if (mutex != NULL) {
|
|
tp->t_mtx = mutex;
|
|
} else {
|
|
tp->t_mtx = &tp->t_mtxobj;
|
|
mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
|
|
}
|
|
|
|
knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
|
|
knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
|
|
|
|
sx_xlock(&tty_list_sx);
|
|
TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
|
|
tty_list_count++;
|
|
sx_xunlock(&tty_list_sx);
|
|
|
|
return (tp);
|
|
}
|
|
|
|
static void
|
|
tty_dealloc(void *arg)
|
|
{
|
|
struct tty *tp = arg;
|
|
|
|
sx_xlock(&tty_list_sx);
|
|
TAILQ_REMOVE(&tty_list, tp, t_list);
|
|
tty_list_count--;
|
|
sx_xunlock(&tty_list_sx);
|
|
|
|
/* Make sure we haven't leaked buffers. */
|
|
MPASS(ttyinq_getsize(&tp->t_inq) == 0);
|
|
MPASS(ttyoutq_getsize(&tp->t_outq) == 0);
|
|
|
|
seldrain(&tp->t_inpoll);
|
|
seldrain(&tp->t_outpoll);
|
|
knlist_destroy(&tp->t_inpoll.si_note);
|
|
knlist_destroy(&tp->t_outpoll.si_note);
|
|
|
|
cv_destroy(&tp->t_inwait);
|
|
cv_destroy(&tp->t_outwait);
|
|
cv_destroy(&tp->t_bgwait);
|
|
cv_destroy(&tp->t_dcdwait);
|
|
cv_destroy(&tp->t_outserwait);
|
|
|
|
if (tp->t_mtx == &tp->t_mtxobj)
|
|
mtx_destroy(&tp->t_mtxobj);
|
|
ttydevsw_free(tp);
|
|
free(tp, M_TTY);
|
|
}
|
|
|
|
static void
|
|
tty_rel_free(struct tty *tp)
|
|
{
|
|
struct cdev *dev;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
#define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
|
|
if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
|
|
/* TTY is still in use. */
|
|
tty_unlock(tp);
|
|
return;
|
|
}
|
|
|
|
/* TTY can be deallocated. */
|
|
dev = tp->t_dev;
|
|
tp->t_dev = NULL;
|
|
tty_unlock(tp);
|
|
|
|
if (dev != NULL)
|
|
destroy_dev_sched_cb(dev, tty_dealloc, tp);
|
|
}
|
|
|
|
void
|
|
tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
|
|
{
|
|
MPASS(tp->t_sessioncnt > 0);
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
if (tp->t_pgrp == pg)
|
|
tp->t_pgrp = NULL;
|
|
|
|
tty_unlock(tp);
|
|
}
|
|
|
|
void
|
|
tty_rel_sess(struct tty *tp, struct session *sess)
|
|
{
|
|
MPASS(tp->t_sessioncnt > 0);
|
|
|
|
/* Current session has left. */
|
|
if (tp->t_session == sess) {
|
|
tp->t_session = NULL;
|
|
MPASS(tp->t_pgrp == NULL);
|
|
}
|
|
tp->t_sessioncnt--;
|
|
tty_rel_free(tp);
|
|
}
|
|
|
|
void
|
|
tty_rel_gone(struct tty *tp)
|
|
{
|
|
MPASS(!tty_gone(tp));
|
|
|
|
/* Simulate carrier removal. */
|
|
ttydisc_modem(tp, 0);
|
|
|
|
/* Wake up all blocked threads. */
|
|
tty_wakeup(tp, FREAD|FWRITE);
|
|
cv_broadcast(&tp->t_bgwait);
|
|
cv_broadcast(&tp->t_dcdwait);
|
|
|
|
tp->t_flags |= TF_GONE;
|
|
tty_rel_free(tp);
|
|
}
|
|
|
|
/*
|
|
* Exposing information about current TTY's through sysctl
|
|
*/
|
|
|
|
static void
|
|
tty_to_xtty(struct tty *tp, struct xtty *xt)
|
|
{
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
xt->xt_size = sizeof(struct xtty);
|
|
xt->xt_insize = ttyinq_getsize(&tp->t_inq);
|
|
xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
|
|
xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
|
|
xt->xt_inlow = tp->t_inlow;
|
|
xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
|
|
xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
|
|
xt->xt_outlow = tp->t_outlow;
|
|
xt->xt_column = tp->t_column;
|
|
xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
|
|
xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
|
|
xt->xt_flags = tp->t_flags;
|
|
xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
|
|
}
|
|
|
|
static int
|
|
sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
unsigned long lsize;
|
|
struct xtty *xtlist, *xt;
|
|
struct tty *tp;
|
|
int error;
|
|
|
|
sx_slock(&tty_list_sx);
|
|
lsize = tty_list_count * sizeof(struct xtty);
|
|
if (lsize == 0) {
|
|
sx_sunlock(&tty_list_sx);
|
|
return (0);
|
|
}
|
|
|
|
xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
|
|
|
|
TAILQ_FOREACH(tp, &tty_list, t_list) {
|
|
tty_lock(tp);
|
|
tty_to_xtty(tp, xt);
|
|
tty_unlock(tp);
|
|
xt++;
|
|
}
|
|
sx_sunlock(&tty_list_sx);
|
|
|
|
error = SYSCTL_OUT(req, xtlist, lsize);
|
|
free(xtlist, M_TTY);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
|
|
0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
|
|
|
|
/*
|
|
* Device node creation. Device has been set up, now we can expose it to
|
|
* the user.
|
|
*/
|
|
|
|
int
|
|
tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
struct cdev *dev, *init, *lock, *cua, *cinit, *clock;
|
|
const char *prefix = "tty";
|
|
char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
|
|
uid_t uid;
|
|
gid_t gid;
|
|
mode_t mode;
|
|
int error;
|
|
|
|
/* Remove "tty" prefix from devices like PTY's. */
|
|
if (tp->t_flags & TF_NOPREFIX)
|
|
prefix = "";
|
|
|
|
va_start(ap, fmt);
|
|
vsnrprintf(name, sizeof name, 32, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (cred == NULL) {
|
|
/* System device. */
|
|
uid = UID_ROOT;
|
|
gid = GID_WHEEL;
|
|
mode = S_IRUSR|S_IWUSR;
|
|
} else {
|
|
/* User device. */
|
|
uid = cred->cr_ruid;
|
|
gid = GID_TTY;
|
|
mode = S_IRUSR|S_IWUSR|S_IWGRP;
|
|
}
|
|
|
|
flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0;
|
|
flags |= MAKEDEV_CHECKNAME;
|
|
|
|
/* Master call-in device. */
|
|
error = make_dev_p(flags, &dev, &ttydev_cdevsw, cred, uid, gid, mode,
|
|
"%s%s", prefix, name);
|
|
if (error)
|
|
return (error);
|
|
dev->si_drv1 = tp;
|
|
wakeup(&dev->si_drv1);
|
|
tp->t_dev = dev;
|
|
|
|
init = lock = cua = cinit = clock = NULL;
|
|
|
|
/* Slave call-in devices. */
|
|
if (tp->t_flags & TF_INITLOCK) {
|
|
error = make_dev_p(flags, &init, &ttyil_cdevsw, cred, uid,
|
|
gid, mode, "%s%s.init", prefix, name);
|
|
if (error)
|
|
goto fail;
|
|
dev_depends(dev, init);
|
|
dev2unit(init) = TTYUNIT_INIT;
|
|
init->si_drv1 = tp;
|
|
wakeup(&init->si_drv1);
|
|
init->si_drv2 = &tp->t_termios_init_in;
|
|
|
|
error = make_dev_p(flags, &lock, &ttyil_cdevsw, cred, uid,
|
|
gid, mode, "%s%s.lock", prefix, name);
|
|
if (error)
|
|
goto fail;
|
|
dev_depends(dev, lock);
|
|
dev2unit(lock) = TTYUNIT_LOCK;
|
|
lock->si_drv1 = tp;
|
|
wakeup(&lock->si_drv1);
|
|
lock->si_drv2 = &tp->t_termios_lock_in;
|
|
}
|
|
|
|
/* Call-out devices. */
|
|
if (tp->t_flags & TF_CALLOUT) {
|
|
error = make_dev_p(flags, &cua, &ttydev_cdevsw, cred,
|
|
UID_UUCP, GID_DIALER, 0660, "cua%s", name);
|
|
if (error)
|
|
goto fail;
|
|
dev_depends(dev, cua);
|
|
dev2unit(cua) = TTYUNIT_CALLOUT;
|
|
cua->si_drv1 = tp;
|
|
wakeup(&cua->si_drv1);
|
|
|
|
/* Slave call-out devices. */
|
|
if (tp->t_flags & TF_INITLOCK) {
|
|
error = make_dev_p(flags, &cinit, &ttyil_cdevsw, cred,
|
|
UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
|
|
if (error)
|
|
goto fail;
|
|
dev_depends(dev, cinit);
|
|
dev2unit(cinit) = TTYUNIT_CALLOUT | TTYUNIT_INIT;
|
|
cinit->si_drv1 = tp;
|
|
wakeup(&cinit->si_drv1);
|
|
cinit->si_drv2 = &tp->t_termios_init_out;
|
|
|
|
error = make_dev_p(flags, &clock, &ttyil_cdevsw, cred,
|
|
UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
|
|
if (error)
|
|
goto fail;
|
|
dev_depends(dev, clock);
|
|
dev2unit(clock) = TTYUNIT_CALLOUT | TTYUNIT_LOCK;
|
|
clock->si_drv1 = tp;
|
|
wakeup(&clock->si_drv1);
|
|
clock->si_drv2 = &tp->t_termios_lock_out;
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
|
|
fail:
|
|
destroy_dev(dev);
|
|
if (init)
|
|
destroy_dev(init);
|
|
if (lock)
|
|
destroy_dev(lock);
|
|
if (cinit)
|
|
destroy_dev(cinit);
|
|
if (clock)
|
|
destroy_dev(clock);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Signalling processes.
|
|
*/
|
|
|
|
void
|
|
tty_signal_sessleader(struct tty *tp, int sig)
|
|
{
|
|
struct proc *p;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
MPASS(sig >= 1 && sig < NSIG);
|
|
|
|
/* Make signals start output again. */
|
|
tp->t_flags &= ~TF_STOPPED;
|
|
|
|
if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
|
|
p = tp->t_session->s_leader;
|
|
PROC_LOCK(p);
|
|
kern_psignal(p, sig);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
}
|
|
|
|
void
|
|
tty_signal_pgrp(struct tty *tp, int sig)
|
|
{
|
|
ksiginfo_t ksi;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
MPASS(sig >= 1 && sig < NSIG);
|
|
|
|
/* Make signals start output again. */
|
|
tp->t_flags &= ~TF_STOPPED;
|
|
|
|
if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
|
|
tty_info(tp);
|
|
if (tp->t_pgrp != NULL) {
|
|
ksiginfo_init(&ksi);
|
|
ksi.ksi_signo = sig;
|
|
ksi.ksi_code = SI_KERNEL;
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, sig, 1, &ksi);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
}
|
|
|
|
void
|
|
tty_wakeup(struct tty *tp, int flags)
|
|
{
|
|
if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
|
|
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
|
|
|
|
if (flags & FWRITE) {
|
|
cv_broadcast(&tp->t_outwait);
|
|
selwakeup(&tp->t_outpoll);
|
|
KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
|
|
}
|
|
if (flags & FREAD) {
|
|
cv_broadcast(&tp->t_inwait);
|
|
selwakeup(&tp->t_inpoll);
|
|
KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
|
|
}
|
|
}
|
|
|
|
int
|
|
tty_wait(struct tty *tp, struct cv *cv)
|
|
{
|
|
int error;
|
|
int revokecnt = tp->t_revokecnt;
|
|
|
|
tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
|
|
MPASS(!tty_gone(tp));
|
|
|
|
error = cv_wait_sig(cv, tp->t_mtx);
|
|
|
|
/* Restart the system call when we may have been revoked. */
|
|
if (tp->t_revokecnt != revokecnt)
|
|
return (ERESTART);
|
|
|
|
/* Bail out when the device slipped away. */
|
|
if (tty_gone(tp))
|
|
return (ENXIO);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
tty_timedwait(struct tty *tp, struct cv *cv, int hz)
|
|
{
|
|
int error;
|
|
int revokecnt = tp->t_revokecnt;
|
|
|
|
tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
|
|
MPASS(!tty_gone(tp));
|
|
|
|
error = cv_timedwait_sig(cv, tp->t_mtx, hz);
|
|
|
|
/* Restart the system call when we may have been revoked. */
|
|
if (tp->t_revokecnt != revokecnt)
|
|
return (ERESTART);
|
|
|
|
/* Bail out when the device slipped away. */
|
|
if (tty_gone(tp))
|
|
return (ENXIO);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
tty_flush(struct tty *tp, int flags)
|
|
{
|
|
if (flags & FWRITE) {
|
|
tp->t_flags &= ~TF_HIWAT_OUT;
|
|
ttyoutq_flush(&tp->t_outq);
|
|
tty_wakeup(tp, FWRITE);
|
|
ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
|
|
}
|
|
if (flags & FREAD) {
|
|
tty_hiwat_in_unblock(tp);
|
|
ttyinq_flush(&tp->t_inq);
|
|
ttydevsw_inwakeup(tp);
|
|
ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
|
|
}
|
|
}
|
|
|
|
void
|
|
tty_set_winsize(struct tty *tp, const struct winsize *wsz)
|
|
{
|
|
|
|
if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0)
|
|
return;
|
|
tp->t_winsize = *wsz;
|
|
tty_signal_pgrp(tp, SIGWINCH);
|
|
}
|
|
|
|
static int
|
|
tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
switch (cmd) {
|
|
/*
|
|
* Modem commands.
|
|
* The SER_* and TIOCM_* flags are the same, but one bit
|
|
* shifted. I don't know why.
|
|
*/
|
|
case TIOCSDTR:
|
|
ttydevsw_modem(tp, SER_DTR, 0);
|
|
return (0);
|
|
case TIOCCDTR:
|
|
ttydevsw_modem(tp, 0, SER_DTR);
|
|
return (0);
|
|
case TIOCMSET: {
|
|
int bits = *(int *)data;
|
|
ttydevsw_modem(tp,
|
|
(bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
|
|
((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
|
|
return (0);
|
|
}
|
|
case TIOCMBIS: {
|
|
int bits = *(int *)data;
|
|
ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
|
|
return (0);
|
|
}
|
|
case TIOCMBIC: {
|
|
int bits = *(int *)data;
|
|
ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
|
|
return (0);
|
|
}
|
|
case TIOCMGET:
|
|
*(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
|
|
return (0);
|
|
|
|
case FIOASYNC:
|
|
if (*(int *)data)
|
|
tp->t_flags |= TF_ASYNC;
|
|
else
|
|
tp->t_flags &= ~TF_ASYNC;
|
|
return (0);
|
|
case FIONBIO:
|
|
/* This device supports non-blocking operation. */
|
|
return (0);
|
|
case FIONREAD:
|
|
*(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
|
|
return (0);
|
|
case FIONWRITE:
|
|
case TIOCOUTQ:
|
|
*(int *)data = ttyoutq_bytesused(&tp->t_outq);
|
|
return (0);
|
|
case FIOSETOWN:
|
|
if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
|
|
/* Not allowed to set ownership. */
|
|
return (ENOTTY);
|
|
|
|
/* Temporarily unlock the TTY to set ownership. */
|
|
tty_unlock(tp);
|
|
error = fsetown(*(int *)data, &tp->t_sigio);
|
|
tty_lock(tp);
|
|
return (error);
|
|
case FIOGETOWN:
|
|
if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
|
|
/* Not allowed to set ownership. */
|
|
return (ENOTTY);
|
|
|
|
/* Get ownership. */
|
|
*(int *)data = fgetown(&tp->t_sigio);
|
|
return (0);
|
|
case TIOCGETA:
|
|
/* Obtain terminal flags through tcgetattr(). */
|
|
*(struct termios*)data = tp->t_termios;
|
|
return (0);
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF: {
|
|
struct termios *t = data;
|
|
|
|
/*
|
|
* Who makes up these funny rules? According to POSIX,
|
|
* input baud rate is set equal to the output baud rate
|
|
* when zero.
|
|
*/
|
|
if (t->c_ispeed == 0)
|
|
t->c_ispeed = t->c_ospeed;
|
|
|
|
/* Discard any unsupported bits. */
|
|
t->c_iflag &= TTYSUP_IFLAG;
|
|
t->c_oflag &= TTYSUP_OFLAG;
|
|
t->c_lflag &= TTYSUP_LFLAG;
|
|
t->c_cflag &= TTYSUP_CFLAG;
|
|
|
|
/* Set terminal flags through tcsetattr(). */
|
|
if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
|
|
error = tty_drain(tp);
|
|
if (error)
|
|
return (error);
|
|
if (cmd == TIOCSETAF)
|
|
tty_flush(tp, FREAD);
|
|
}
|
|
|
|
/*
|
|
* Only call param() when the flags really change.
|
|
*/
|
|
if ((t->c_cflag & CIGNORE) == 0 &&
|
|
(tp->t_termios.c_cflag != t->c_cflag ||
|
|
((tp->t_termios.c_iflag ^ t->c_iflag) &
|
|
(IXON|IXOFF|IXANY)) ||
|
|
tp->t_termios.c_ispeed != t->c_ispeed ||
|
|
tp->t_termios.c_ospeed != t->c_ospeed)) {
|
|
error = ttydevsw_param(tp, t);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* XXX: CLOCAL? */
|
|
|
|
tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
|
|
tp->t_termios.c_ispeed = t->c_ispeed;
|
|
tp->t_termios.c_ospeed = t->c_ospeed;
|
|
|
|
/* Baud rate has changed - update watermarks. */
|
|
tty_watermarks(tp);
|
|
}
|
|
|
|
/* Copy new non-device driver parameters. */
|
|
tp->t_termios.c_iflag = t->c_iflag;
|
|
tp->t_termios.c_oflag = t->c_oflag;
|
|
tp->t_termios.c_lflag = t->c_lflag;
|
|
memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
|
|
|
|
ttydisc_optimize(tp);
|
|
|
|
if ((t->c_lflag & ICANON) == 0) {
|
|
/*
|
|
* When in non-canonical mode, wake up all
|
|
* readers. Canonicalize any partial input. VMIN
|
|
* and VTIME could also be adjusted.
|
|
*/
|
|
ttyinq_canonicalize(&tp->t_inq);
|
|
tty_wakeup(tp, FREAD);
|
|
}
|
|
|
|
/*
|
|
* For packet mode: notify the PTY consumer that VSTOP
|
|
* and VSTART may have been changed.
|
|
*/
|
|
if (tp->t_termios.c_iflag & IXON &&
|
|
tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
|
|
tp->t_termios.c_cc[VSTART] == CTRL('Q'))
|
|
ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
|
|
else
|
|
ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
|
|
return (0);
|
|
}
|
|
case TIOCGETD:
|
|
/* For compatibility - we only support TTYDISC. */
|
|
*(int *)data = TTYDISC;
|
|
return (0);
|
|
case TIOCGPGRP:
|
|
if (!tty_is_ctty(tp, td->td_proc))
|
|
return (ENOTTY);
|
|
|
|
if (tp->t_pgrp != NULL)
|
|
*(int *)data = tp->t_pgrp->pg_id;
|
|
else
|
|
*(int *)data = NO_PID;
|
|
return (0);
|
|
case TIOCGSID:
|
|
if (!tty_is_ctty(tp, td->td_proc))
|
|
return (ENOTTY);
|
|
|
|
MPASS(tp->t_session);
|
|
*(int *)data = tp->t_session->s_sid;
|
|
return (0);
|
|
case TIOCSCTTY: {
|
|
struct proc *p = td->td_proc;
|
|
|
|
/* XXX: This looks awful. */
|
|
tty_unlock(tp);
|
|
sx_xlock(&proctree_lock);
|
|
tty_lock(tp);
|
|
|
|
if (!SESS_LEADER(p)) {
|
|
/* Only the session leader may do this. */
|
|
sx_xunlock(&proctree_lock);
|
|
return (EPERM);
|
|
}
|
|
|
|
if (tp->t_session != NULL && tp->t_session == p->p_session) {
|
|
/* This is already our controlling TTY. */
|
|
sx_xunlock(&proctree_lock);
|
|
return (0);
|
|
}
|
|
|
|
if (p->p_session->s_ttyp != NULL ||
|
|
(tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
|
|
tp->t_session->s_ttyvp->v_type != VBAD)) {
|
|
/*
|
|
* There is already a relation between a TTY and
|
|
* a session, or the caller is not the session
|
|
* leader.
|
|
*
|
|
* Allow the TTY to be stolen when the vnode is
|
|
* invalid, but the reference to the TTY is
|
|
* still active. This allows immediate reuse of
|
|
* TTYs of which the session leader has been
|
|
* killed or the TTY revoked.
|
|
*/
|
|
sx_xunlock(&proctree_lock);
|
|
return (EPERM);
|
|
}
|
|
|
|
/* Connect the session to the TTY. */
|
|
tp->t_session = p->p_session;
|
|
tp->t_session->s_ttyp = tp;
|
|
tp->t_sessioncnt++;
|
|
sx_xunlock(&proctree_lock);
|
|
|
|
/* Assign foreground process group. */
|
|
tp->t_pgrp = p->p_pgrp;
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_CONTROLT;
|
|
PROC_UNLOCK(p);
|
|
|
|
return (0);
|
|
}
|
|
case TIOCSPGRP: {
|
|
struct pgrp *pg;
|
|
|
|
/*
|
|
* XXX: Temporarily unlock the TTY to locate the process
|
|
* group. This code would be lot nicer if we would ever
|
|
* decompose proctree_lock.
|
|
*/
|
|
tty_unlock(tp);
|
|
sx_slock(&proctree_lock);
|
|
pg = pgfind(*(int *)data);
|
|
if (pg != NULL)
|
|
PGRP_UNLOCK(pg);
|
|
if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
|
|
sx_sunlock(&proctree_lock);
|
|
tty_lock(tp);
|
|
return (EPERM);
|
|
}
|
|
tty_lock(tp);
|
|
|
|
/*
|
|
* Determine if this TTY is the controlling TTY after
|
|
* relocking the TTY.
|
|
*/
|
|
if (!tty_is_ctty(tp, td->td_proc)) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (ENOTTY);
|
|
}
|
|
tp->t_pgrp = pg;
|
|
sx_sunlock(&proctree_lock);
|
|
|
|
/* Wake up the background process groups. */
|
|
cv_broadcast(&tp->t_bgwait);
|
|
return (0);
|
|
}
|
|
case TIOCFLUSH: {
|
|
int flags = *(int *)data;
|
|
|
|
if (flags == 0)
|
|
flags = (FREAD|FWRITE);
|
|
else
|
|
flags &= (FREAD|FWRITE);
|
|
tty_flush(tp, flags);
|
|
return (0);
|
|
}
|
|
case TIOCDRAIN:
|
|
/* Drain TTY output. */
|
|
return tty_drain(tp);
|
|
case TIOCCONS:
|
|
/* Set terminal as console TTY. */
|
|
if (*(int *)data) {
|
|
error = priv_check(td, PRIV_TTY_CONSOLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* XXX: constty should really need to be locked!
|
|
* XXX: allow disconnected constty's to be stolen!
|
|
*/
|
|
|
|
if (constty == tp)
|
|
return (0);
|
|
if (constty != NULL)
|
|
return (EBUSY);
|
|
|
|
tty_unlock(tp);
|
|
constty_set(tp);
|
|
tty_lock(tp);
|
|
} else if (constty == tp) {
|
|
constty_clear();
|
|
}
|
|
return (0);
|
|
case TIOCGWINSZ:
|
|
/* Obtain window size. */
|
|
*(struct winsize*)data = tp->t_winsize;
|
|
return (0);
|
|
case TIOCSWINSZ:
|
|
/* Set window size. */
|
|
tty_set_winsize(tp, data);
|
|
return (0);
|
|
case TIOCEXCL:
|
|
tp->t_flags |= TF_EXCLUDE;
|
|
return (0);
|
|
case TIOCNXCL:
|
|
tp->t_flags &= ~TF_EXCLUDE;
|
|
return (0);
|
|
case TIOCSTOP:
|
|
tp->t_flags |= TF_STOPPED;
|
|
ttydevsw_pktnotify(tp, TIOCPKT_STOP);
|
|
return (0);
|
|
case TIOCSTART:
|
|
tp->t_flags &= ~TF_STOPPED;
|
|
ttydevsw_outwakeup(tp);
|
|
ttydevsw_pktnotify(tp, TIOCPKT_START);
|
|
return (0);
|
|
case TIOCSTAT:
|
|
tty_info(tp);
|
|
return (0);
|
|
case TIOCSTI:
|
|
if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
|
|
return (EPERM);
|
|
if (!tty_is_ctty(tp, td->td_proc) &&
|
|
priv_check(td, PRIV_TTY_STI))
|
|
return (EACCES);
|
|
ttydisc_rint(tp, *(char *)data, 0);
|
|
ttydisc_rint_done(tp);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef COMPAT_43TTY
|
|
return tty_ioctl_compat(tp, cmd, data, fflag, td);
|
|
#else /* !COMPAT_43TTY */
|
|
return (ENOIOCTL);
|
|
#endif /* COMPAT_43TTY */
|
|
}
|
|
|
|
int
|
|
tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
|
|
if (tty_gone(tp))
|
|
return (ENXIO);
|
|
|
|
error = ttydevsw_ioctl(tp, cmd, data, td);
|
|
if (error == ENOIOCTL)
|
|
error = tty_generic_ioctl(tp, cmd, data, fflag, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
dev_t
|
|
tty_udev(struct tty *tp)
|
|
{
|
|
if (tp->t_dev)
|
|
return dev2udev(tp->t_dev);
|
|
else
|
|
return NODEV;
|
|
}
|
|
|
|
int
|
|
tty_checkoutq(struct tty *tp)
|
|
{
|
|
|
|
/* 256 bytes should be enough to print a log message. */
|
|
return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
|
|
}
|
|
|
|
void
|
|
tty_hiwat_in_block(struct tty *tp)
|
|
{
|
|
|
|
if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
|
|
tp->t_termios.c_iflag & IXOFF &&
|
|
tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
|
|
/*
|
|
* Input flow control. Only enter the high watermark when we
|
|
* can successfully store the VSTOP character.
|
|
*/
|
|
if (ttyoutq_write_nofrag(&tp->t_outq,
|
|
&tp->t_termios.c_cc[VSTOP], 1) == 0)
|
|
tp->t_flags |= TF_HIWAT_IN;
|
|
} else {
|
|
/* No input flow control. */
|
|
tp->t_flags |= TF_HIWAT_IN;
|
|
}
|
|
}
|
|
|
|
void
|
|
tty_hiwat_in_unblock(struct tty *tp)
|
|
{
|
|
|
|
if (tp->t_flags & TF_HIWAT_IN &&
|
|
tp->t_termios.c_iflag & IXOFF &&
|
|
tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
|
|
/*
|
|
* Input flow control. Only leave the high watermark when we
|
|
* can successfully store the VSTART character.
|
|
*/
|
|
if (ttyoutq_write_nofrag(&tp->t_outq,
|
|
&tp->t_termios.c_cc[VSTART], 1) == 0)
|
|
tp->t_flags &= ~TF_HIWAT_IN;
|
|
} else {
|
|
/* No input flow control. */
|
|
tp->t_flags &= ~TF_HIWAT_IN;
|
|
}
|
|
|
|
if (!tty_gone(tp))
|
|
ttydevsw_inwakeup(tp);
|
|
}
|
|
|
|
/*
|
|
* TTY hooks interface.
|
|
*/
|
|
|
|
static int
|
|
ttyhook_defrint(struct tty *tp, char c, int flags)
|
|
{
|
|
|
|
if (ttyhook_rint_bypass(tp, &c, 1) != 1)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ttyhook_register(struct tty **rtp, struct proc *p, int fd,
|
|
struct ttyhook *th, void *softc)
|
|
{
|
|
struct tty *tp;
|
|
struct file *fp;
|
|
struct cdev *dev;
|
|
struct cdevsw *cdp;
|
|
struct filedesc *fdp;
|
|
cap_rights_t rights;
|
|
int error, ref;
|
|
|
|
/* Validate the file descriptor. */
|
|
fdp = p->p_fd;
|
|
error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK),
|
|
0, &fp, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
if (fp->f_ops == &badfileops) {
|
|
error = EBADF;
|
|
goto done1;
|
|
}
|
|
|
|
/*
|
|
* Make sure the vnode is bound to a character device.
|
|
* Unlocked check for the vnode type is ok there, because we
|
|
* only shall prevent calling devvn_refthread on the file that
|
|
* never has been opened over a character device.
|
|
*/
|
|
if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
|
|
error = EINVAL;
|
|
goto done1;
|
|
}
|
|
|
|
/* Make sure it is a TTY. */
|
|
cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
|
|
if (cdp == NULL) {
|
|
error = ENXIO;
|
|
goto done1;
|
|
}
|
|
if (dev != fp->f_data) {
|
|
error = ENXIO;
|
|
goto done2;
|
|
}
|
|
if (cdp != &ttydev_cdevsw) {
|
|
error = ENOTTY;
|
|
goto done2;
|
|
}
|
|
tp = dev->si_drv1;
|
|
|
|
/* Try to attach the hook to the TTY. */
|
|
error = EBUSY;
|
|
tty_lock(tp);
|
|
MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
|
|
if (tp->t_flags & TF_HOOK)
|
|
goto done3;
|
|
|
|
tp->t_flags |= TF_HOOK;
|
|
tp->t_hook = th;
|
|
tp->t_hooksoftc = softc;
|
|
*rtp = tp;
|
|
error = 0;
|
|
|
|
/* Maybe we can switch into bypass mode now. */
|
|
ttydisc_optimize(tp);
|
|
|
|
/* Silently convert rint() calls to rint_bypass() when possible. */
|
|
if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
|
|
th->th_rint = ttyhook_defrint;
|
|
|
|
done3: tty_unlock(tp);
|
|
done2: dev_relthread(dev, ref);
|
|
done1: fdrop(fp, curthread);
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
ttyhook_unregister(struct tty *tp)
|
|
{
|
|
|
|
tty_lock_assert(tp, MA_OWNED);
|
|
MPASS(tp->t_flags & TF_HOOK);
|
|
|
|
/* Disconnect the hook. */
|
|
tp->t_flags &= ~TF_HOOK;
|
|
tp->t_hook = NULL;
|
|
|
|
/* Maybe we need to leave bypass mode. */
|
|
ttydisc_optimize(tp);
|
|
|
|
/* Maybe deallocate the TTY as well. */
|
|
tty_rel_free(tp);
|
|
}
|
|
|
|
/*
|
|
* /dev/console handling.
|
|
*/
|
|
|
|
static int
|
|
ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
|
|
{
|
|
struct tty *tp;
|
|
|
|
/* System has no console device. */
|
|
if (dev_console_filename == NULL)
|
|
return (ENXIO);
|
|
|
|
/* Look up corresponding TTY by device name. */
|
|
sx_slock(&tty_list_sx);
|
|
TAILQ_FOREACH(tp, &tty_list, t_list) {
|
|
if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
|
|
dev_console->si_drv1 = tp;
|
|
break;
|
|
}
|
|
}
|
|
sx_sunlock(&tty_list_sx);
|
|
|
|
/* System console has no TTY associated. */
|
|
if (dev_console->si_drv1 == NULL)
|
|
return (ENXIO);
|
|
|
|
return (ttydev_open(dev, oflags, devtype, td));
|
|
}
|
|
|
|
static int
|
|
ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
|
|
log_console(uio);
|
|
|
|
return (ttydev_write(dev, uio, ioflag));
|
|
}
|
|
|
|
/*
|
|
* /dev/console is a little different than normal TTY's. When opened,
|
|
* it determines which TTY to use. When data gets written to it, it
|
|
* will be logged in the kernel message buffer.
|
|
*/
|
|
static struct cdevsw ttyconsdev_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_open = ttyconsdev_open,
|
|
.d_close = ttydev_close,
|
|
.d_read = ttydev_read,
|
|
.d_write = ttyconsdev_write,
|
|
.d_ioctl = ttydev_ioctl,
|
|
.d_kqfilter = ttydev_kqfilter,
|
|
.d_poll = ttydev_poll,
|
|
.d_mmap = ttydev_mmap,
|
|
.d_name = "ttyconsdev",
|
|
.d_flags = D_TTY,
|
|
};
|
|
|
|
static void
|
|
ttyconsdev_init(void *unused)
|
|
{
|
|
|
|
dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0,
|
|
NULL, UID_ROOT, GID_WHEEL, 0600, "console");
|
|
}
|
|
|
|
SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
|
|
|
|
void
|
|
ttyconsdev_select(const char *name)
|
|
{
|
|
|
|
dev_console_filename = name;
|
|
}
|
|
|
|
/*
|
|
* Debugging routines.
|
|
*/
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <ddb/ddb.h>
|
|
#include <ddb/db_sym.h>
|
|
|
|
static struct {
|
|
int flag;
|
|
char val;
|
|
} ttystates[] = {
|
|
#if 0
|
|
{ TF_NOPREFIX, 'N' },
|
|
#endif
|
|
{ TF_INITLOCK, 'I' },
|
|
{ TF_CALLOUT, 'C' },
|
|
|
|
/* Keep these together -> 'Oi' and 'Oo'. */
|
|
{ TF_OPENED, 'O' },
|
|
{ TF_OPENED_IN, 'i' },
|
|
{ TF_OPENED_OUT, 'o' },
|
|
{ TF_OPENED_CONS, 'c' },
|
|
|
|
{ TF_GONE, 'G' },
|
|
{ TF_OPENCLOSE, 'B' },
|
|
{ TF_ASYNC, 'Y' },
|
|
{ TF_LITERAL, 'L' },
|
|
|
|
/* Keep these together -> 'Hi' and 'Ho'. */
|
|
{ TF_HIWAT, 'H' },
|
|
{ TF_HIWAT_IN, 'i' },
|
|
{ TF_HIWAT_OUT, 'o' },
|
|
|
|
{ TF_STOPPED, 'S' },
|
|
{ TF_EXCLUDE, 'X' },
|
|
{ TF_BYPASS, 'l' },
|
|
{ TF_ZOMBIE, 'Z' },
|
|
{ TF_HOOK, 's' },
|
|
|
|
/* Keep these together -> 'bi' and 'bo'. */
|
|
{ TF_BUSY, 'b' },
|
|
{ TF_BUSY_IN, 'i' },
|
|
{ TF_BUSY_OUT, 'o' },
|
|
|
|
{ 0, '\0'},
|
|
};
|
|
|
|
#define TTY_FLAG_BITS \
|
|
"\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \
|
|
"\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \
|
|
"\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK"
|
|
|
|
#define DB_PRINTSYM(name, addr) \
|
|
db_printf("%s " #name ": ", sep); \
|
|
db_printsym((db_addr_t) addr, DB_STGY_ANY); \
|
|
db_printf("\n");
|
|
|
|
static void
|
|
_db_show_devsw(const char *sep, const struct ttydevsw *tsw)
|
|
{
|
|
db_printf("%sdevsw: ", sep);
|
|
db_printsym((db_addr_t)tsw, DB_STGY_ANY);
|
|
db_printf(" (%p)\n", tsw);
|
|
DB_PRINTSYM(open, tsw->tsw_open);
|
|
DB_PRINTSYM(close, tsw->tsw_close);
|
|
DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
|
|
DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
|
|
DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
|
|
DB_PRINTSYM(param, tsw->tsw_param);
|
|
DB_PRINTSYM(modem, tsw->tsw_modem);
|
|
DB_PRINTSYM(mmap, tsw->tsw_mmap);
|
|
DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
|
|
DB_PRINTSYM(free, tsw->tsw_free);
|
|
}
|
|
static void
|
|
_db_show_hooks(const char *sep, const struct ttyhook *th)
|
|
{
|
|
db_printf("%shook: ", sep);
|
|
db_printsym((db_addr_t)th, DB_STGY_ANY);
|
|
db_printf(" (%p)\n", th);
|
|
if (th == NULL)
|
|
return;
|
|
DB_PRINTSYM(rint, th->th_rint);
|
|
DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
|
|
DB_PRINTSYM(rint_done, th->th_rint_done);
|
|
DB_PRINTSYM(rint_poll, th->th_rint_poll);
|
|
DB_PRINTSYM(getc_inject, th->th_getc_inject);
|
|
DB_PRINTSYM(getc_capture, th->th_getc_capture);
|
|
DB_PRINTSYM(getc_poll, th->th_getc_poll);
|
|
DB_PRINTSYM(close, th->th_close);
|
|
}
|
|
|
|
static void
|
|
_db_show_termios(const char *name, const struct termios *t)
|
|
{
|
|
|
|
db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
|
|
"lflag 0x%x ispeed %u ospeed %u\n", name,
|
|
t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
|
|
t->c_ispeed, t->c_ospeed);
|
|
}
|
|
|
|
/* DDB command to show TTY statistics. */
|
|
DB_SHOW_COMMAND(tty, db_show_tty)
|
|
{
|
|
struct tty *tp;
|
|
|
|
if (!have_addr) {
|
|
db_printf("usage: show tty <addr>\n");
|
|
return;
|
|
}
|
|
tp = (struct tty *)addr;
|
|
|
|
db_printf("0x%p: %s\n", tp, tty_devname(tp));
|
|
db_printf("\tmtx: %p\n", tp->t_mtx);
|
|
db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS);
|
|
db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
|
|
|
|
/* Buffering mechanisms. */
|
|
db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
|
|
"nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
|
|
tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
|
|
tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
|
|
db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
|
|
&tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
|
|
tp->t_outq.to_nblocks, tp->t_outq.to_quota);
|
|
db_printf("\tinlow: %zu\n", tp->t_inlow);
|
|
db_printf("\toutlow: %zu\n", tp->t_outlow);
|
|
_db_show_termios("\ttermios", &tp->t_termios);
|
|
db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
|
|
tp->t_winsize.ws_row, tp->t_winsize.ws_col,
|
|
tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
|
|
db_printf("\tcolumn: %u\n", tp->t_column);
|
|
db_printf("\twritepos: %u\n", tp->t_writepos);
|
|
db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
|
|
|
|
/* Init/lock-state devices. */
|
|
_db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
|
|
_db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
|
|
_db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
|
|
_db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
|
|
|
|
/* Hooks */
|
|
_db_show_devsw("\t", tp->t_devsw);
|
|
_db_show_hooks("\t", tp->t_hook);
|
|
|
|
/* Process info. */
|
|
db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
|
|
tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
|
|
tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
|
|
db_printf("\tsession: %p", tp->t_session);
|
|
if (tp->t_session != NULL)
|
|
db_printf(" count %u leader %p tty %p sid %d login %s",
|
|
tp->t_session->s_count, tp->t_session->s_leader,
|
|
tp->t_session->s_ttyp, tp->t_session->s_sid,
|
|
tp->t_session->s_login);
|
|
db_printf("\n");
|
|
db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
|
|
db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
|
|
db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
|
|
db_printf("\tdev: %p\n", tp->t_dev);
|
|
}
|
|
|
|
/* DDB command to list TTYs. */
|
|
DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
|
|
{
|
|
struct tty *tp;
|
|
size_t isiz, osiz;
|
|
int i, j;
|
|
|
|
/* Make the output look like `pstat -t'. */
|
|
db_printf("PTR ");
|
|
#if defined(__LP64__)
|
|
db_printf(" ");
|
|
#endif
|
|
db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
|
|
"COL SESS PGID STATE\n");
|
|
|
|
TAILQ_FOREACH(tp, &tty_list, t_list) {
|
|
isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
|
|
osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
|
|
|
|
db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ",
|
|
tp,
|
|
tty_devname(tp),
|
|
isiz,
|
|
tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
|
|
tp->t_inq.ti_end - tp->t_inq.ti_linestart,
|
|
isiz - tp->t_inlow,
|
|
osiz,
|
|
tp->t_outq.to_end - tp->t_outq.to_begin,
|
|
osiz - tp->t_outlow,
|
|
MIN(tp->t_column, 99999),
|
|
tp->t_session ? tp->t_session->s_sid : 0,
|
|
tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
|
|
|
|
/* Flag bits. */
|
|
for (i = j = 0; ttystates[i].flag; i++)
|
|
if (tp->t_flags & ttystates[i].flag) {
|
|
db_printf("%c", ttystates[i].val);
|
|
j++;
|
|
}
|
|
if (j == 0)
|
|
db_printf("-");
|
|
db_printf("\n");
|
|
}
|
|
}
|
|
#endif /* DDB */
|