2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
7 * Portions of this software were developed under sponsorship from Snow
8 * B.V., the Netherlands.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_capsicum.h"
36 #include "opt_printf.h"
38 #include <sys/param.h>
39 #include <sys/capsicum.h>
42 #include <sys/fcntl.h>
44 #include <sys/filedesc.h>
45 #include <sys/filio.h>
47 #include <sys/ioctl_compat.h>
48 #endif /* COMPAT_43TTY */
49 #include <sys/kernel.h>
50 #include <sys/limits.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
56 #include <sys/serial.h>
57 #include <sys/signal.h>
60 #include <sys/sysctl.h>
61 #include <sys/systm.h>
63 #include <sys/ttycom.h>
65 #include <sys/ttydefaults.h>
67 #include <sys/ucred.h>
68 #include <sys/vnode.h>
70 #include <machine/stdarg.h>
72 static MALLOC_DEFINE(M_TTY, "tty", "tty device");
74 static void tty_rel_free(struct tty *tp);
76 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
77 static struct sx tty_list_sx;
78 SX_SYSINIT(tty_list, &tty_list_sx, "tty list");
79 static unsigned int tty_list_count = 0;
81 /* Character device of /dev/console. */
82 static struct cdev *dev_console;
83 static const char *dev_console_filename;
86 * Flags that are supported and stored by this implementation.
88 #define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
89 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
90 #define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
91 #define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
92 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
93 FLUSHO|NOKERNINFO|NOFLSH)
94 #define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\
95 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\
96 CDSR_OFLOW|CCAR_OFLOW|CNO_RTSDTR)
98 #define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT)
100 static int tty_drainwait = 5 * 60;
101 SYSCTL_INT(_kern, OID_AUTO, tty_drainwait, CTLFLAG_RWTUN,
102 &tty_drainwait, 0, "Default output drain timeout in seconds");
105 * Set TTY buffer sizes.
108 #define TTYBUF_MAX 65536
110 #ifdef PRINTF_BUFR_SIZE
111 #define TTY_PRBUF_SIZE PRINTF_BUFR_SIZE
113 #define TTY_PRBUF_SIZE 256
117 * Allocate buffer space if necessary, and set low watermarks, based on speed.
118 * Note that the ttyxxxq_setsize() functions may drop and then reacquire the tty
119 * lock during memory allocation. They will return ENXIO if the tty disappears
123 tty_watermarks(struct tty *tp)
128 /* Provide an input buffer for 2 seconds of data. */
129 if (tp->t_termios.c_cflag & CREAD)
130 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX);
131 error = ttyinq_setsize(&tp->t_inq, tp, bs);
135 /* Set low watermark at 10% (when 90% is available). */
136 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10;
138 /* Provide an output buffer for 2 seconds of data. */
139 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX);
140 error = ttyoutq_setsize(&tp->t_outq, tp, bs);
144 /* Set low watermark at 10% (when 90% is available). */
145 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10;
151 tty_drain(struct tty *tp, int leaving)
153 sbintime_t timeout_at;
157 if (ttyhook_hashook(tp, getc_inject))
158 /* buffer is inaccessible */
162 * For close(), use the recent historic timeout of "1 second without
163 * making progress". For tcdrain(), use t_drainwait as the timeout,
164 * with zero meaning "no timeout" which gives POSIX behavior.
167 timeout_at = getsbinuptime() + SBT_1S;
168 else if (tp->t_drainwait != 0)
169 timeout_at = getsbinuptime() + SBT_1S * tp->t_drainwait;
174 * Poll the output buffer and the hardware for completion, at 10 Hz.
175 * Polling is required for devices which are not able to signal an
176 * interrupt when the transmitter becomes idle (most USB serial devs).
177 * The unusual structure of this loop ensures we check for busy one more
178 * time after tty_timedwait() returns EWOULDBLOCK, so that success has
179 * higher priority than timeout if the IO completed in the last 100mS.
182 bytes = ttyoutq_bytesused(&tp->t_outq);
184 if (ttyoutq_bytesused(&tp->t_outq) == 0 && !ttydevsw_busy(tp))
188 ttydevsw_outwakeup(tp);
189 error = tty_timedwait(tp, &tp->t_outwait, hz / 10);
190 if (error != 0 && error != EWOULDBLOCK)
192 else if (timeout_at == 0 || getsbinuptime() < timeout_at)
194 else if (leaving && ttyoutq_bytesused(&tp->t_outq) < bytes) {
195 /* In close, making progress, grant an extra second. */
197 timeout_at += SBT_1S;
198 bytes = ttyoutq_bytesused(&tp->t_outq);
204 * Though ttydev_enter() and ttydev_leave() seem to be related, they
205 * don't have to be used together. ttydev_enter() is used by the cdev
206 * operations to prevent an actual operation from being processed when
207 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open()
208 * and ttydev_close() to determine whether per-TTY data should be
213 ttydev_enter(struct tty *tp)
218 if (tty_gone(tp) || !tty_opened(tp)) {
219 /* Device is already gone. */
228 ttydev_leave(struct tty *tp)
231 tty_lock_assert(tp, MA_OWNED);
233 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
234 /* Device is still opened somewhere. */
239 tp->t_flags |= TF_OPENCLOSE;
241 /* Remove console TTY. */
245 /* Drain any output. */
251 /* Free i/o queues now since they might be large. */
252 ttyinq_free(&tp->t_inq);
254 ttyoutq_free(&tp->t_outq);
257 knlist_clear(&tp->t_inpoll.si_note, 1);
258 knlist_clear(&tp->t_outpoll.si_note, 1);
263 tp->t_flags &= ~TF_OPENCLOSE;
264 cv_broadcast(&tp->t_dcdwait);
269 * Operations that are exposed through the character device in /dev.
272 ttydev_open(struct cdev *dev, int oflags, int devtype __unused,
282 /* Device is already gone. */
288 * Block when other processes are currently opening or closing
291 while (tp->t_flags & TF_OPENCLOSE) {
292 error = tty_wait(tp, &tp->t_dcdwait);
298 tp->t_flags |= TF_OPENCLOSE;
301 * Make sure the "tty" and "cua" device cannot be opened at the
302 * same time. The console is a "tty" device.
304 if (TTY_CALLOUT(tp, dev)) {
305 if (tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) {
310 if (tp->t_flags & TF_OPENED_OUT) {
316 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
321 if (!tty_opened(tp)) {
322 /* Set proper termios flags. */
323 if (TTY_CALLOUT(tp, dev))
324 tp->t_termios = tp->t_termios_init_out;
326 tp->t_termios = tp->t_termios_init_in;
327 ttydevsw_param(tp, &tp->t_termios);
328 /* Prevent modem control on callout devices and /dev/console. */
329 if (TTY_CALLOUT(tp, dev) || dev == dev_console)
330 tp->t_termios.c_cflag |= CLOCAL;
332 if ((tp->t_termios.c_cflag & CNO_RTSDTR) == 0)
333 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
335 error = ttydevsw_open(tp);
340 error = tty_watermarks(tp);
345 /* Wait for Carrier Detect. */
346 if ((oflags & O_NONBLOCK) == 0 &&
347 (tp->t_termios.c_cflag & CLOCAL) == 0) {
348 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
349 error = tty_wait(tp, &tp->t_dcdwait);
355 if (dev == dev_console)
356 tp->t_flags |= TF_OPENED_CONS;
357 else if (TTY_CALLOUT(tp, dev))
358 tp->t_flags |= TF_OPENED_OUT;
360 tp->t_flags |= TF_OPENED_IN;
361 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 ||
362 (tp->t_flags & TF_OPENED_OUT) == 0);
364 done: tp->t_flags &= ~TF_OPENCLOSE;
365 cv_broadcast(&tp->t_dcdwait);
372 ttydev_close(struct cdev *dev, int fflag, int devtype __unused,
373 struct thread *td __unused)
375 struct tty *tp = dev->si_drv1;
380 * Don't actually close the device if it is being used as the
383 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 ||
384 (tp->t_flags & TF_OPENED_OUT) == 0);
385 if (dev == dev_console)
386 tp->t_flags &= ~TF_OPENED_CONS;
388 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
390 if (tp->t_flags & TF_OPENED) {
395 /* If revoking, flush output now to avoid draining it later. */
397 tty_flush(tp, FWRITE);
399 tp->t_flags &= ~TF_EXCLUDE;
401 /* Properly wake up threads that are stuck - revoke(). */
403 tty_wakeup(tp, FREAD|FWRITE);
404 cv_broadcast(&tp->t_bgwait);
405 cv_broadcast(&tp->t_dcdwait);
413 tty_is_ctty(struct tty *tp, struct proc *p)
416 tty_lock_assert(tp, MA_OWNED);
418 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
422 tty_wait_background(struct tty *tp, struct thread *td, int sig)
424 struct proc *p = td->td_proc;
429 MPASS(sig == SIGTTIN || sig == SIGTTOU);
430 tty_lock_assert(tp, MA_OWNED);
435 * The process should only sleep, when:
436 * - This terminal is the controlling terminal
437 * - Its process group is not the foreground process
439 * - The parent process isn't waiting for the child to
441 * - the signal to send to the process isn't masked
443 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
444 /* Allow the action to happen. */
449 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
450 SIGISMEMBER(td->td_sigmask, sig)) {
451 /* Only allow them in write()/ioctl(). */
453 return (sig == SIGTTOU ? 0 : EIO);
457 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
458 /* Don't allow the action to happen. */
465 * Send the signal and sleep until we're the new
466 * foreground process group.
470 ksi.ksi_code = SI_KERNEL;
475 pgsignal(pg, ksi.ksi_signo, 1, &ksi);
478 error = tty_wait(tp, &tp->t_bgwait);
485 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
487 struct tty *tp = dev->si_drv1;
490 error = ttydev_enter(tp);
493 error = ttydisc_read(tp, uio, ioflag);
497 * The read() call should not throw an error when the device is
498 * being destroyed. Silently convert it to an EOF.
500 done: if (error == ENXIO)
506 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
508 struct tty *tp = dev->si_drv1;
511 error = ttydev_enter(tp);
515 if (tp->t_termios.c_lflag & TOSTOP) {
516 error = tty_wait_background(tp, curthread, SIGTTOU);
521 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
522 /* Allow non-blocking writes to bypass serialization. */
523 error = ttydisc_write(tp, uio, ioflag);
525 /* Serialize write() calls. */
526 while (tp->t_flags & TF_BUSY_OUT) {
527 error = tty_wait(tp, &tp->t_outserwait);
532 tp->t_flags |= TF_BUSY_OUT;
533 error = ttydisc_write(tp, uio, ioflag);
534 tp->t_flags &= ~TF_BUSY_OUT;
535 cv_signal(&tp->t_outserwait);
538 done: tty_unlock(tp);
543 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
546 struct tty *tp = dev->si_drv1;
549 error = ttydev_enter(tp);
584 #endif /* COMPAT_43TTY */
586 * If the ioctl() causes the TTY to be modified, let it
587 * wait in the background.
589 error = tty_wait_background(tp, curthread, SIGTTOU);
594 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
595 struct termios *old = &tp->t_termios;
596 struct termios *new = (struct termios *)data;
597 struct termios *lock = TTY_CALLOUT(tp, dev) ?
598 &tp->t_termios_lock_out : &tp->t_termios_lock_in;
602 * Lock state devices. Just overwrite the values of the
603 * commands that are currently in use.
605 new->c_iflag = (old->c_iflag & lock->c_iflag) |
606 (new->c_iflag & ~lock->c_iflag);
607 new->c_oflag = (old->c_oflag & lock->c_oflag) |
608 (new->c_oflag & ~lock->c_oflag);
609 new->c_cflag = (old->c_cflag & lock->c_cflag) |
610 (new->c_cflag & ~lock->c_cflag);
611 new->c_lflag = (old->c_lflag & lock->c_lflag) |
612 (new->c_lflag & ~lock->c_lflag);
613 for (cc = 0; cc < NCCS; ++cc)
615 new->c_cc[cc] = old->c_cc[cc];
617 new->c_ispeed = old->c_ispeed;
619 new->c_ospeed = old->c_ospeed;
622 error = tty_ioctl(tp, cmd, data, fflag, td);
623 done: tty_unlock(tp);
629 ttydev_poll(struct cdev *dev, int events, struct thread *td)
631 struct tty *tp = dev->si_drv1;
632 int error, revents = 0;
634 error = ttydev_enter(tp);
636 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
638 if (events & (POLLIN|POLLRDNORM)) {
639 /* See if we can read something. */
640 if (ttydisc_read_poll(tp) > 0)
641 revents |= events & (POLLIN|POLLRDNORM);
644 if (tp->t_flags & TF_ZOMBIE) {
645 /* Hangup flag on zombie state. */
647 } else if (events & (POLLOUT|POLLWRNORM)) {
648 /* See if we can write something. */
649 if (ttydisc_write_poll(tp) > 0)
650 revents |= events & (POLLOUT|POLLWRNORM);
654 if (events & (POLLIN|POLLRDNORM))
655 selrecord(td, &tp->t_inpoll);
656 if (events & (POLLOUT|POLLWRNORM))
657 selrecord(td, &tp->t_outpoll);
666 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
667 int nprot, vm_memattr_t *memattr)
669 struct tty *tp = dev->si_drv1;
672 /* Handle mmap() through the driver. */
674 error = ttydev_enter(tp);
677 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr);
688 tty_kqops_read_detach(struct knote *kn)
690 struct tty *tp = kn->kn_hook;
692 knlist_remove(&tp->t_inpoll.si_note, kn, 0);
696 tty_kqops_read_event(struct knote *kn, long hint __unused)
698 struct tty *tp = kn->kn_hook;
700 tty_lock_assert(tp, MA_OWNED);
702 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
703 kn->kn_flags |= EV_EOF;
706 kn->kn_data = ttydisc_read_poll(tp);
707 return (kn->kn_data > 0);
712 tty_kqops_write_detach(struct knote *kn)
714 struct tty *tp = kn->kn_hook;
716 knlist_remove(&tp->t_outpoll.si_note, kn, 0);
720 tty_kqops_write_event(struct knote *kn, long hint __unused)
722 struct tty *tp = kn->kn_hook;
724 tty_lock_assert(tp, MA_OWNED);
727 kn->kn_flags |= EV_EOF;
730 kn->kn_data = ttydisc_write_poll(tp);
731 return (kn->kn_data > 0);
735 static struct filterops tty_kqops_read = {
737 .f_detach = tty_kqops_read_detach,
738 .f_event = tty_kqops_read_event,
741 static struct filterops tty_kqops_write = {
743 .f_detach = tty_kqops_write_detach,
744 .f_event = tty_kqops_write_event,
748 ttydev_kqfilter(struct cdev *dev, struct knote *kn)
750 struct tty *tp = dev->si_drv1;
753 error = ttydev_enter(tp);
757 switch (kn->kn_filter) {
760 kn->kn_fop = &tty_kqops_read;
761 knlist_add(&tp->t_inpoll.si_note, kn, 1);
765 kn->kn_fop = &tty_kqops_write;
766 knlist_add(&tp->t_outpoll.si_note, kn, 1);
777 static struct cdevsw ttydev_cdevsw = {
778 .d_version = D_VERSION,
779 .d_open = ttydev_open,
780 .d_close = ttydev_close,
781 .d_read = ttydev_read,
782 .d_write = ttydev_write,
783 .d_ioctl = ttydev_ioctl,
784 .d_kqfilter = ttydev_kqfilter,
785 .d_poll = ttydev_poll,
786 .d_mmap = ttydev_mmap,
792 * Init/lock-state devices
796 ttyil_open(struct cdev *dev, int oflags __unused, int devtype __unused,
813 ttyil_close(struct cdev *dev __unused, int flag __unused, int mode __unused,
814 struct thread *td __unused)
821 ttyil_rdwr(struct cdev *dev __unused, struct uio *uio __unused,
829 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
832 struct tty *tp = dev->si_drv1;
841 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td);
842 if (error != ENOIOCTL)
848 /* Obtain terminal flags through tcgetattr(). */
849 *(struct termios*)data = *(struct termios*)dev->si_drv2;
852 /* Set terminal flags through tcsetattr(). */
853 error = priv_check(td, PRIV_TTY_SETA);
856 *(struct termios*)dev->si_drv2 = *(struct termios*)data;
859 *(int *)data = TTYDISC;
862 bzero(data, sizeof(struct winsize));
868 done: tty_unlock(tp);
872 static struct cdevsw ttyil_cdevsw = {
873 .d_version = D_VERSION,
874 .d_open = ttyil_open,
875 .d_close = ttyil_close,
876 .d_read = ttyil_rdwr,
877 .d_write = ttyil_rdwr,
878 .d_ioctl = ttyil_ioctl,
884 tty_init_termios(struct tty *tp)
886 struct termios *t = &tp->t_termios_init_in;
888 t->c_cflag = TTYDEF_CFLAG;
889 t->c_iflag = TTYDEF_IFLAG;
890 t->c_lflag = TTYDEF_LFLAG;
891 t->c_oflag = TTYDEF_OFLAG;
892 t->c_ispeed = TTYDEF_SPEED;
893 t->c_ospeed = TTYDEF_SPEED;
894 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
896 tp->t_termios_init_out = *t;
900 tty_init_console(struct tty *tp, speed_t s)
902 struct termios *ti = &tp->t_termios_init_in;
903 struct termios *to = &tp->t_termios_init_out;
906 ti->c_ispeed = ti->c_ospeed = s;
907 to->c_ispeed = to->c_ospeed = s;
910 ti->c_cflag |= CLOCAL;
911 to->c_cflag |= CLOCAL;
915 * Standard device routine implementations, mostly meant for
916 * pseudo-terminal device drivers. When a driver creates a new terminal
917 * device class, missing routines are patched.
921 ttydevsw_defopen(struct tty *tp __unused)
928 ttydevsw_defclose(struct tty *tp __unused)
934 ttydevsw_defoutwakeup(struct tty *tp __unused)
937 panic("Terminal device has output, while not implemented");
941 ttydevsw_definwakeup(struct tty *tp __unused)
947 ttydevsw_defioctl(struct tty *tp __unused, u_long cmd __unused,
948 caddr_t data __unused, struct thread *td __unused)
955 ttydevsw_defcioctl(struct tty *tp __unused, int unit __unused,
956 u_long cmd __unused, caddr_t data __unused, struct thread *td __unused)
963 ttydevsw_defparam(struct tty *tp __unused, struct termios *t)
967 * Allow the baud rate to be adjusted for pseudo-devices, but at
968 * least restrict it to 115200 to prevent excessive buffer
969 * usage. Also disallow 0, to prevent foot shooting.
971 if (t->c_ispeed < B50)
973 else if (t->c_ispeed > B115200)
974 t->c_ispeed = B115200;
975 if (t->c_ospeed < B50)
977 else if (t->c_ospeed > B115200)
978 t->c_ospeed = B115200;
985 ttydevsw_defmodem(struct tty *tp __unused, int sigon __unused,
989 /* Simulate a carrier to make the TTY layer happy. */
994 ttydevsw_defmmap(struct tty *tp __unused, vm_ooffset_t offset __unused,
995 vm_paddr_t *paddr __unused, int nprot __unused,
996 vm_memattr_t *memattr __unused)
1003 ttydevsw_defpktnotify(struct tty *tp __unused, char event __unused)
1009 ttydevsw_deffree(void *softc __unused)
1012 panic("Terminal device freed without a free-handler");
1016 ttydevsw_defbusy(struct tty *tp __unused)
1023 * TTY allocation and deallocation. TTY devices can be deallocated when
1024 * the driver doesn't use it anymore, when the TTY isn't a session's
1025 * controlling TTY and when the device node isn't opened through devfs.
1029 tty_alloc(struct ttydevsw *tsw, void *sc)
1032 return (tty_alloc_mutex(tsw, sc, NULL));
1036 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
1040 /* Make sure the driver defines all routines. */
1041 #define PATCH_FUNC(x) do { \
1042 if (tsw->tsw_ ## x == NULL) \
1043 tsw->tsw_ ## x = ttydevsw_def ## x; \
1047 PATCH_FUNC(outwakeup);
1048 PATCH_FUNC(inwakeup);
1054 PATCH_FUNC(pktnotify);
1059 tp = malloc(sizeof(struct tty) + TTY_PRBUF_SIZE, M_TTY,
1061 tp->t_prbufsz = TTY_PRBUF_SIZE;
1063 tp->t_devswsoftc = sc;
1064 tp->t_flags = tsw->tsw_flags;
1065 tp->t_drainwait = tty_drainwait;
1067 tty_init_termios(tp);
1069 cv_init(&tp->t_inwait, "ttyin");
1070 cv_init(&tp->t_outwait, "ttyout");
1071 cv_init(&tp->t_outserwait, "ttyosr");
1072 cv_init(&tp->t_bgwait, "ttybg");
1073 cv_init(&tp->t_dcdwait, "ttydcd");
1075 /* Allow drivers to use a custom mutex to lock the TTY. */
1076 if (mutex != NULL) {
1079 tp->t_mtx = &tp->t_mtxobj;
1080 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
1083 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
1084 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
1090 tty_dealloc(void *arg)
1092 struct tty *tp = arg;
1095 * ttyydev_leave() usually frees the i/o queues earlier, but it is
1096 * not always called between queue allocation and here. The queues
1097 * may be allocated by ioctls on a pty control device without the
1098 * corresponding pty slave device ever being open, or after it is
1101 ttyinq_free(&tp->t_inq);
1102 ttyoutq_free(&tp->t_outq);
1103 seldrain(&tp->t_inpoll);
1104 seldrain(&tp->t_outpoll);
1105 knlist_destroy(&tp->t_inpoll.si_note);
1106 knlist_destroy(&tp->t_outpoll.si_note);
1108 cv_destroy(&tp->t_inwait);
1109 cv_destroy(&tp->t_outwait);
1110 cv_destroy(&tp->t_bgwait);
1111 cv_destroy(&tp->t_dcdwait);
1112 cv_destroy(&tp->t_outserwait);
1114 if (tp->t_mtx == &tp->t_mtxobj)
1115 mtx_destroy(&tp->t_mtxobj);
1121 tty_rel_free(struct tty *tp)
1125 tty_lock_assert(tp, MA_OWNED);
1127 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
1128 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
1129 /* TTY is still in use. */
1134 /* Stop asynchronous I/O. */
1135 funsetown(&tp->t_sigio);
1137 /* TTY can be deallocated. */
1143 sx_xlock(&tty_list_sx);
1144 TAILQ_REMOVE(&tty_list, tp, t_list);
1146 sx_xunlock(&tty_list_sx);
1147 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1152 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1155 MPASS(tp->t_sessioncnt > 0);
1156 tty_lock_assert(tp, MA_OWNED);
1158 if (tp->t_pgrp == pg)
1165 tty_rel_sess(struct tty *tp, struct session *sess)
1168 MPASS(tp->t_sessioncnt > 0);
1170 /* Current session has left. */
1171 if (tp->t_session == sess) {
1172 tp->t_session = NULL;
1173 MPASS(tp->t_pgrp == NULL);
1180 tty_rel_gone(struct tty *tp)
1183 MPASS(!tty_gone(tp));
1185 /* Simulate carrier removal. */
1186 ttydisc_modem(tp, 0);
1188 /* Wake up all blocked threads. */
1189 tty_wakeup(tp, FREAD|FWRITE);
1190 cv_broadcast(&tp->t_bgwait);
1191 cv_broadcast(&tp->t_dcdwait);
1193 tp->t_flags |= TF_GONE;
1198 * Exposing information about current TTY's through sysctl
1202 tty_to_xtty(struct tty *tp, struct xtty *xt)
1205 tty_lock_assert(tp, MA_OWNED);
1207 xt->xt_size = sizeof(struct xtty);
1208 xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1209 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1210 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1211 xt->xt_inlow = tp->t_inlow;
1212 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1213 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1214 xt->xt_outlow = tp->t_outlow;
1215 xt->xt_column = tp->t_column;
1216 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1217 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1218 xt->xt_flags = tp->t_flags;
1219 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : (uint32_t)NODEV;
1223 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1225 unsigned long lsize;
1226 struct xtty *xtlist, *xt;
1230 sx_slock(&tty_list_sx);
1231 lsize = tty_list_count * sizeof(struct xtty);
1233 sx_sunlock(&tty_list_sx);
1237 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1239 TAILQ_FOREACH(tp, &tty_list, t_list) {
1241 tty_to_xtty(tp, xt);
1245 sx_sunlock(&tty_list_sx);
1247 error = SYSCTL_OUT(req, xtlist, lsize);
1248 free(xtlist, M_TTY);
1252 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1253 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1256 * Device node creation. Device has been set up, now we can expose it to
1261 tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
1262 const char *fmt, ...)
1265 struct make_dev_args args;
1266 struct cdev *dev, *init, *lock, *cua, *cinit, *clock;
1267 const char *prefix = "tty";
1268 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1274 /* Remove "tty" prefix from devices like PTY's. */
1275 if (tp->t_flags & TF_NOPREFIX)
1279 vsnrprintf(name, sizeof name, 32, fmt, ap);
1283 /* System device. */
1286 mode = S_IRUSR|S_IWUSR;
1289 uid = cred->cr_ruid;
1291 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1294 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0;
1295 flags |= MAKEDEV_CHECKNAME;
1297 /* Master call-in device. */
1298 make_dev_args_init(&args);
1299 args.mda_flags = flags;
1300 args.mda_devsw = &ttydev_cdevsw;
1304 args.mda_mode = mode;
1305 args.mda_si_drv1 = tp;
1306 error = make_dev_s(&args, &dev, "%s%s", prefix, name);
1311 init = lock = cua = cinit = clock = NULL;
1313 /* Slave call-in devices. */
1314 if (tp->t_flags & TF_INITLOCK) {
1315 args.mda_devsw = &ttyil_cdevsw;
1316 args.mda_unit = TTYUNIT_INIT;
1317 args.mda_si_drv1 = tp;
1318 args.mda_si_drv2 = &tp->t_termios_init_in;
1319 error = make_dev_s(&args, &init, "%s%s.init", prefix, name);
1322 dev_depends(dev, init);
1324 args.mda_unit = TTYUNIT_LOCK;
1325 args.mda_si_drv2 = &tp->t_termios_lock_in;
1326 error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name);
1329 dev_depends(dev, lock);
1332 /* Call-out devices. */
1333 if (tp->t_flags & TF_CALLOUT) {
1334 make_dev_args_init(&args);
1335 args.mda_flags = flags;
1336 args.mda_devsw = &ttydev_cdevsw;
1338 args.mda_uid = UID_UUCP;
1339 args.mda_gid = GID_DIALER;
1340 args.mda_mode = 0660;
1341 args.mda_unit = TTYUNIT_CALLOUT;
1342 args.mda_si_drv1 = tp;
1343 error = make_dev_s(&args, &cua, "cua%s", name);
1346 dev_depends(dev, cua);
1348 /* Slave call-out devices. */
1349 if (tp->t_flags & TF_INITLOCK) {
1350 args.mda_devsw = &ttyil_cdevsw;
1351 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT;
1352 args.mda_si_drv2 = &tp->t_termios_init_out;
1353 error = make_dev_s(&args, &cinit, "cua%s.init", name);
1356 dev_depends(dev, cinit);
1358 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK;
1359 args.mda_si_drv2 = &tp->t_termios_lock_out;
1360 error = make_dev_s(&args, &clock, "cua%s.lock", name);
1363 dev_depends(dev, clock);
1367 sx_xlock(&tty_list_sx);
1368 TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
1370 sx_xunlock(&tty_list_sx);
1389 * Signalling processes.
1393 tty_signal_sessleader(struct tty *tp, int sig)
1397 tty_lock_assert(tp, MA_OWNED);
1398 MPASS(sig >= 1 && sig < NSIG);
1400 /* Make signals start output again. */
1401 tp->t_flags &= ~TF_STOPPED;
1403 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1404 p = tp->t_session->s_leader;
1406 kern_psignal(p, sig);
1412 tty_signal_pgrp(struct tty *tp, int sig)
1416 tty_lock_assert(tp, MA_OWNED);
1417 MPASS(sig >= 1 && sig < NSIG);
1419 /* Make signals start output again. */
1420 tp->t_flags &= ~TF_STOPPED;
1422 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1424 if (tp->t_pgrp != NULL) {
1425 ksiginfo_init(&ksi);
1426 ksi.ksi_signo = sig;
1427 ksi.ksi_code = SI_KERNEL;
1428 PGRP_LOCK(tp->t_pgrp);
1429 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1430 PGRP_UNLOCK(tp->t_pgrp);
1435 tty_wakeup(struct tty *tp, int flags)
1438 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1439 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1441 if (flags & FWRITE) {
1442 cv_broadcast(&tp->t_outwait);
1443 selwakeup(&tp->t_outpoll);
1444 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1446 if (flags & FREAD) {
1447 cv_broadcast(&tp->t_inwait);
1448 selwakeup(&tp->t_inpoll);
1449 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1454 tty_wait(struct tty *tp, struct cv *cv)
1457 int revokecnt = tp->t_revokecnt;
1459 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1460 MPASS(!tty_gone(tp));
1462 error = cv_wait_sig(cv, tp->t_mtx);
1464 /* Bail out when the device slipped away. */
1468 /* Restart the system call when we may have been revoked. */
1469 if (tp->t_revokecnt != revokecnt)
1476 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1479 int revokecnt = tp->t_revokecnt;
1481 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1482 MPASS(!tty_gone(tp));
1484 error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1486 /* Bail out when the device slipped away. */
1490 /* Restart the system call when we may have been revoked. */
1491 if (tp->t_revokecnt != revokecnt)
1498 tty_flush(struct tty *tp, int flags)
1501 if (flags & FWRITE) {
1502 tp->t_flags &= ~TF_HIWAT_OUT;
1503 ttyoutq_flush(&tp->t_outq);
1504 tty_wakeup(tp, FWRITE);
1505 if (!tty_gone(tp)) {
1506 ttydevsw_outwakeup(tp);
1507 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1510 if (flags & FREAD) {
1511 tty_hiwat_in_unblock(tp);
1512 ttyinq_flush(&tp->t_inq);
1513 tty_wakeup(tp, FREAD);
1514 if (!tty_gone(tp)) {
1515 ttydevsw_inwakeup(tp);
1516 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1522 tty_set_winsize(struct tty *tp, const struct winsize *wsz)
1525 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0)
1527 tp->t_winsize = *wsz;
1528 tty_signal_pgrp(tp, SIGWINCH);
1532 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1540 * The SER_* and TIOCM_* flags are the same, but one bit
1541 * shifted. I don't know why.
1544 ttydevsw_modem(tp, SER_DTR, 0);
1547 ttydevsw_modem(tp, 0, SER_DTR);
1550 int bits = *(int *)data;
1552 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1553 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1557 int bits = *(int *)data;
1558 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1562 int bits = *(int *)data;
1563 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1567 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1572 tp->t_flags |= TF_ASYNC;
1574 tp->t_flags &= ~TF_ASYNC;
1577 /* This device supports non-blocking operation. */
1580 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1584 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1587 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1588 /* Not allowed to set ownership. */
1591 /* Temporarily unlock the TTY to set ownership. */
1593 error = fsetown(*(int *)data, &tp->t_sigio);
1597 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1598 /* Not allowed to set ownership. */
1601 /* Get ownership. */
1602 *(int *)data = fgetown(&tp->t_sigio);
1605 /* Obtain terminal flags through tcgetattr(). */
1606 *(struct termios*)data = tp->t_termios;
1611 struct termios *t = data;
1614 * Who makes up these funny rules? According to POSIX,
1615 * input baud rate is set equal to the output baud rate
1618 if (t->c_ispeed == 0)
1619 t->c_ispeed = t->c_ospeed;
1621 /* Discard any unsupported bits. */
1622 t->c_iflag &= TTYSUP_IFLAG;
1623 t->c_oflag &= TTYSUP_OFLAG;
1624 t->c_lflag &= TTYSUP_LFLAG;
1625 t->c_cflag &= TTYSUP_CFLAG;
1627 /* Set terminal flags through tcsetattr(). */
1628 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1629 error = tty_drain(tp, 0);
1632 if (cmd == TIOCSETAF)
1633 tty_flush(tp, FREAD);
1637 * Only call param() when the flags really change.
1639 if ((t->c_cflag & CIGNORE) == 0 &&
1640 (tp->t_termios.c_cflag != t->c_cflag ||
1641 ((tp->t_termios.c_iflag ^ t->c_iflag) &
1642 (IXON|IXOFF|IXANY)) ||
1643 tp->t_termios.c_ispeed != t->c_ispeed ||
1644 tp->t_termios.c_ospeed != t->c_ospeed)) {
1645 error = ttydevsw_param(tp, t);
1651 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1652 tp->t_termios.c_ispeed = t->c_ispeed;
1653 tp->t_termios.c_ospeed = t->c_ospeed;
1655 /* Baud rate has changed - update watermarks. */
1656 error = tty_watermarks(tp);
1661 /* Copy new non-device driver parameters. */
1662 tp->t_termios.c_iflag = t->c_iflag;
1663 tp->t_termios.c_oflag = t->c_oflag;
1664 tp->t_termios.c_lflag = t->c_lflag;
1665 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1667 ttydisc_optimize(tp);
1669 if ((t->c_lflag & ICANON) == 0) {
1671 * When in non-canonical mode, wake up all
1672 * readers. Canonicalize any partial input. VMIN
1673 * and VTIME could also be adjusted.
1675 ttyinq_canonicalize(&tp->t_inq);
1676 tty_wakeup(tp, FREAD);
1680 * For packet mode: notify the PTY consumer that VSTOP
1681 * and VSTART may have been changed.
1683 if (tp->t_termios.c_iflag & IXON &&
1684 tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1685 tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1686 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1688 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1692 /* For compatibility - we only support TTYDISC. */
1693 *(int *)data = TTYDISC;
1696 if (!tty_is_ctty(tp, td->td_proc))
1699 if (tp->t_pgrp != NULL)
1700 *(int *)data = tp->t_pgrp->pg_id;
1702 *(int *)data = NO_PID;
1705 if (!tty_is_ctty(tp, td->td_proc))
1708 MPASS(tp->t_session);
1709 *(int *)data = tp->t_session->s_sid;
1712 struct proc *p = td->td_proc;
1714 /* XXX: This looks awful. */
1716 sx_xlock(&proctree_lock);
1719 if (!SESS_LEADER(p)) {
1720 /* Only the session leader may do this. */
1721 sx_xunlock(&proctree_lock);
1725 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1726 /* This is already our controlling TTY. */
1727 sx_xunlock(&proctree_lock);
1731 if (p->p_session->s_ttyp != NULL ||
1732 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1733 tp->t_session->s_ttyvp->v_type != VBAD)) {
1735 * There is already a relation between a TTY and
1736 * a session, or the caller is not the session
1739 * Allow the TTY to be stolen when the vnode is
1740 * invalid, but the reference to the TTY is
1741 * still active. This allows immediate reuse of
1742 * TTYs of which the session leader has been
1743 * killed or the TTY revoked.
1745 sx_xunlock(&proctree_lock);
1749 /* Connect the session to the TTY. */
1750 tp->t_session = p->p_session;
1751 tp->t_session->s_ttyp = tp;
1753 sx_xunlock(&proctree_lock);
1755 /* Assign foreground process group. */
1756 tp->t_pgrp = p->p_pgrp;
1758 p->p_flag |= P_CONTROLT;
1767 * XXX: Temporarily unlock the TTY to locate the process
1768 * group. This code would be lot nicer if we would ever
1769 * decompose proctree_lock.
1772 sx_slock(&proctree_lock);
1773 pg = pgfind(*(int *)data);
1776 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1777 sx_sunlock(&proctree_lock);
1784 * Determine if this TTY is the controlling TTY after
1785 * relocking the TTY.
1787 if (!tty_is_ctty(tp, td->td_proc)) {
1788 sx_sunlock(&proctree_lock);
1792 sx_sunlock(&proctree_lock);
1794 /* Wake up the background process groups. */
1795 cv_broadcast(&tp->t_bgwait);
1799 int flags = *(int *)data;
1802 flags = (FREAD|FWRITE);
1804 flags &= (FREAD|FWRITE);
1805 tty_flush(tp, flags);
1809 /* Drain TTY output. */
1810 return tty_drain(tp, 0);
1811 case TIOCGDRAINWAIT:
1812 *(int *)data = tp->t_drainwait;
1814 case TIOCSDRAINWAIT:
1815 error = priv_check(td, PRIV_TTY_DRAINWAIT);
1817 tp->t_drainwait = *(int *)data;
1820 /* Set terminal as console TTY. */
1822 error = priv_check(td, PRIV_TTY_CONSOLE);
1827 * XXX: constty should really need to be locked!
1828 * XXX: allow disconnected constty's to be stolen!
1833 if (constty != NULL)
1839 } else if (constty == tp) {
1844 /* Obtain window size. */
1845 *(struct winsize*)data = tp->t_winsize;
1848 /* Set window size. */
1849 tty_set_winsize(tp, data);
1852 tp->t_flags |= TF_EXCLUDE;
1855 tp->t_flags &= ~TF_EXCLUDE;
1858 tp->t_flags |= TF_STOPPED;
1859 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1862 tp->t_flags &= ~TF_STOPPED;
1863 ttydevsw_outwakeup(tp);
1864 ttydevsw_pktnotify(tp, TIOCPKT_START);
1870 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1872 if (!tty_is_ctty(tp, td->td_proc) &&
1873 priv_check(td, PRIV_TTY_STI))
1875 ttydisc_rint(tp, *(char *)data, 0);
1876 ttydisc_rint_done(tp);
1881 return tty_ioctl_compat(tp, cmd, data, fflag, td);
1882 #else /* !COMPAT_43TTY */
1884 #endif /* COMPAT_43TTY */
1888 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1892 tty_lock_assert(tp, MA_OWNED);
1897 error = ttydevsw_ioctl(tp, cmd, data, td);
1898 if (error == ENOIOCTL)
1899 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1905 tty_udev(struct tty *tp)
1909 return (dev2udev(tp->t_dev));
1915 tty_checkoutq(struct tty *tp)
1918 /* 256 bytes should be enough to print a log message. */
1919 return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1923 tty_hiwat_in_block(struct tty *tp)
1926 if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1927 tp->t_termios.c_iflag & IXOFF &&
1928 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1930 * Input flow control. Only enter the high watermark when we
1931 * can successfully store the VSTOP character.
1933 if (ttyoutq_write_nofrag(&tp->t_outq,
1934 &tp->t_termios.c_cc[VSTOP], 1) == 0)
1935 tp->t_flags |= TF_HIWAT_IN;
1937 /* No input flow control. */
1938 tp->t_flags |= TF_HIWAT_IN;
1943 tty_hiwat_in_unblock(struct tty *tp)
1946 if (tp->t_flags & TF_HIWAT_IN &&
1947 tp->t_termios.c_iflag & IXOFF &&
1948 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1950 * Input flow control. Only leave the high watermark when we
1951 * can successfully store the VSTART character.
1953 if (ttyoutq_write_nofrag(&tp->t_outq,
1954 &tp->t_termios.c_cc[VSTART], 1) == 0)
1955 tp->t_flags &= ~TF_HIWAT_IN;
1957 /* No input flow control. */
1958 tp->t_flags &= ~TF_HIWAT_IN;
1962 ttydevsw_inwakeup(tp);
1966 * TTY hooks interface.
1970 ttyhook_defrint(struct tty *tp, char c, int flags)
1973 if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1980 ttyhook_register(struct tty **rtp, struct proc *p, int fd, struct ttyhook *th,
1987 struct filedesc *fdp;
1988 cap_rights_t rights;
1991 /* Validate the file descriptor. */
1993 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK),
1997 if (fp->f_ops == &badfileops) {
2003 * Make sure the vnode is bound to a character device.
2004 * Unlocked check for the vnode type is ok there, because we
2005 * only shall prevent calling devvn_refthread on the file that
2006 * never has been opened over a character device.
2008 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
2013 /* Make sure it is a TTY. */
2014 cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
2019 if (dev != fp->f_data) {
2023 if (cdp != &ttydev_cdevsw) {
2029 /* Try to attach the hook to the TTY. */
2032 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
2033 if (tp->t_flags & TF_HOOK)
2036 tp->t_flags |= TF_HOOK;
2038 tp->t_hooksoftc = softc;
2042 /* Maybe we can switch into bypass mode now. */
2043 ttydisc_optimize(tp);
2045 /* Silently convert rint() calls to rint_bypass() when possible. */
2046 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
2047 th->th_rint = ttyhook_defrint;
2049 done3: tty_unlock(tp);
2050 done2: dev_relthread(dev, ref);
2051 done1: fdrop(fp, curthread);
2056 ttyhook_unregister(struct tty *tp)
2059 tty_lock_assert(tp, MA_OWNED);
2060 MPASS(tp->t_flags & TF_HOOK);
2062 /* Disconnect the hook. */
2063 tp->t_flags &= ~TF_HOOK;
2066 /* Maybe we need to leave bypass mode. */
2067 ttydisc_optimize(tp);
2069 /* Maybe deallocate the TTY as well. */
2074 * /dev/console handling.
2078 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
2082 /* System has no console device. */
2083 if (dev_console_filename == NULL)
2086 /* Look up corresponding TTY by device name. */
2087 sx_slock(&tty_list_sx);
2088 TAILQ_FOREACH(tp, &tty_list, t_list) {
2089 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
2090 dev_console->si_drv1 = tp;
2094 sx_sunlock(&tty_list_sx);
2096 /* System console has no TTY associated. */
2097 if (dev_console->si_drv1 == NULL)
2100 return (ttydev_open(dev, oflags, devtype, td));
2104 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
2109 return (ttydev_write(dev, uio, ioflag));
2113 * /dev/console is a little different than normal TTY's. When opened,
2114 * it determines which TTY to use. When data gets written to it, it
2115 * will be logged in the kernel message buffer.
2117 static struct cdevsw ttyconsdev_cdevsw = {
2118 .d_version = D_VERSION,
2119 .d_open = ttyconsdev_open,
2120 .d_close = ttydev_close,
2121 .d_read = ttydev_read,
2122 .d_write = ttyconsdev_write,
2123 .d_ioctl = ttydev_ioctl,
2124 .d_kqfilter = ttydev_kqfilter,
2125 .d_poll = ttydev_poll,
2126 .d_mmap = ttydev_mmap,
2127 .d_name = "ttyconsdev",
2132 ttyconsdev_init(void *unused __unused)
2135 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0,
2136 NULL, UID_ROOT, GID_WHEEL, 0600, "console");
2139 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
2142 ttyconsdev_select(const char *name)
2145 dev_console_filename = name;
2149 * Debugging routines.
2152 #include "opt_ddb.h"
2154 #include <ddb/ddb.h>
2155 #include <ddb/db_sym.h>
2157 static const struct {
2162 { TF_NOPREFIX, 'N' },
2164 { TF_INITLOCK, 'I' },
2165 { TF_CALLOUT, 'C' },
2167 /* Keep these together -> 'Oi' and 'Oo'. */
2169 { TF_OPENED_IN, 'i' },
2170 { TF_OPENED_OUT, 'o' },
2171 { TF_OPENED_CONS, 'c' },
2174 { TF_OPENCLOSE, 'B' },
2176 { TF_LITERAL, 'L' },
2178 /* Keep these together -> 'Hi' and 'Ho'. */
2180 { TF_HIWAT_IN, 'i' },
2181 { TF_HIWAT_OUT, 'o' },
2183 { TF_STOPPED, 'S' },
2184 { TF_EXCLUDE, 'X' },
2189 /* Keep these together -> 'bi' and 'bo'. */
2191 { TF_BUSY_IN, 'i' },
2192 { TF_BUSY_OUT, 'o' },
2197 #define TTY_FLAG_BITS \
2198 "\20\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN" \
2199 "\5OPENED_OUT\6OPENED_CONS\7GONE\10OPENCLOSE" \
2200 "\11ASYNC\12LITERAL\13HIWAT_IN\14HIWAT_OUT" \
2201 "\15STOPPED\16EXCLUDE\17BYPASS\20ZOMBIE" \
2202 "\21HOOK\22BUSY_IN\23BUSY_OUT"
2204 #define DB_PRINTSYM(name, addr) \
2205 db_printf("%s " #name ": ", sep); \
2206 db_printsym((db_addr_t) addr, DB_STGY_ANY); \
2210 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2213 db_printf("%sdevsw: ", sep);
2214 db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2215 db_printf(" (%p)\n", tsw);
2216 DB_PRINTSYM(open, tsw->tsw_open);
2217 DB_PRINTSYM(close, tsw->tsw_close);
2218 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2219 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2220 DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2221 DB_PRINTSYM(param, tsw->tsw_param);
2222 DB_PRINTSYM(modem, tsw->tsw_modem);
2223 DB_PRINTSYM(mmap, tsw->tsw_mmap);
2224 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2225 DB_PRINTSYM(free, tsw->tsw_free);
2229 _db_show_hooks(const char *sep, const struct ttyhook *th)
2232 db_printf("%shook: ", sep);
2233 db_printsym((db_addr_t)th, DB_STGY_ANY);
2234 db_printf(" (%p)\n", th);
2237 DB_PRINTSYM(rint, th->th_rint);
2238 DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2239 DB_PRINTSYM(rint_done, th->th_rint_done);
2240 DB_PRINTSYM(rint_poll, th->th_rint_poll);
2241 DB_PRINTSYM(getc_inject, th->th_getc_inject);
2242 DB_PRINTSYM(getc_capture, th->th_getc_capture);
2243 DB_PRINTSYM(getc_poll, th->th_getc_poll);
2244 DB_PRINTSYM(close, th->th_close);
2248 _db_show_termios(const char *name, const struct termios *t)
2251 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2252 "lflag 0x%x ispeed %u ospeed %u\n", name,
2253 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2254 t->c_ispeed, t->c_ospeed);
2257 /* DDB command to show TTY statistics. */
2258 DB_SHOW_COMMAND(tty, db_show_tty)
2263 db_printf("usage: show tty <addr>\n");
2266 tp = (struct tty *)addr;
2268 db_printf("%p: %s\n", tp, tty_devname(tp));
2269 db_printf("\tmtx: %p\n", tp->t_mtx);
2270 db_printf("\tflags: 0x%b\n", tp->t_flags, TTY_FLAG_BITS);
2271 db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2273 /* Buffering mechanisms. */
2274 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2275 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2276 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2277 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2278 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2279 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2280 tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2281 db_printf("\tinlow: %zu\n", tp->t_inlow);
2282 db_printf("\toutlow: %zu\n", tp->t_outlow);
2283 _db_show_termios("\ttermios", &tp->t_termios);
2284 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2285 tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2286 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2287 db_printf("\tcolumn: %u\n", tp->t_column);
2288 db_printf("\twritepos: %u\n", tp->t_writepos);
2289 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2291 /* Init/lock-state devices. */
2292 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2293 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2294 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2295 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2298 _db_show_devsw("\t", tp->t_devsw);
2299 _db_show_hooks("\t", tp->t_hook);
2302 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2303 tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2304 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2305 db_printf("\tsession: %p", tp->t_session);
2306 if (tp->t_session != NULL)
2307 db_printf(" count %u leader %p tty %p sid %d login %s",
2308 tp->t_session->s_count, tp->t_session->s_leader,
2309 tp->t_session->s_ttyp, tp->t_session->s_sid,
2310 tp->t_session->s_login);
2312 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2313 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2314 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2315 db_printf("\tdev: %p\n", tp->t_dev);
2318 /* DDB command to list TTYs. */
2319 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2325 /* Make the output look like `pstat -t'. */
2327 #if defined(__LP64__)
2330 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
2331 "COL SESS PGID STATE\n");
2333 TAILQ_FOREACH(tp, &tty_list, t_list) {
2334 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2335 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2337 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d "
2338 "%5d ", tp, tty_devname(tp), isiz,
2339 tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2340 tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2341 isiz - tp->t_inlow, osiz,
2342 tp->t_outq.to_end - tp->t_outq.to_begin,
2343 osiz - tp->t_outlow, MIN(tp->t_column, 99999),
2344 tp->t_session ? tp->t_session->s_sid : 0,
2345 tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2348 for (i = j = 0; ttystates[i].flag; i++)
2349 if (tp->t_flags & ttystates[i].flag) {
2350 db_printf("%c", ttystates[i].val);