228 lines
8.6 KiB
C
228 lines
8.6 KiB
C
/*-
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* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Portions of this software were developed under sponsorship from Snow
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* B.V., the Netherlands.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_TTY_H_
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#define _SYS_TTY_H_
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <sys/selinfo.h>
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#include <sys/_termios.h>
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#include <sys/ttycom.h>
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#include <sys/ttyqueue.h>
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struct cdev;
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struct file;
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struct pgrp;
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struct session;
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struct ucred;
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struct ttydevsw;
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/*
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* Per-TTY structure, containing buffers, etc.
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*
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* List of locks
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* (t) locked by t_mtx
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* (l) locked by tty_list_sx
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* (c) const until freeing
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*/
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struct tty {
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struct mtx *t_mtx; /* TTY lock. */
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struct mtx t_mtxobj; /* Per-TTY lock (when not borrowing). */
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TAILQ_ENTRY(tty) t_list; /* (l) TTY list entry. */
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unsigned int t_flags; /* (t) Terminal option flags. */
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/* Keep flags in sync with db_show_tty and pstat(8). */
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#define TF_NOPREFIX 0x00001 /* Don't prepend "tty" to device name. */
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#define TF_INITLOCK 0x00002 /* Create init/lock state devices. */
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#define TF_CALLOUT 0x00004 /* Create "cua" devices. */
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#define TF_OPENED_IN 0x00008 /* "tty" node is in use. */
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#define TF_OPENED_OUT 0x00010 /* "cua" node is in use. */
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#define TF_OPENED_CONS 0x00020 /* Device in use as console. */
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#define TF_OPENED (TF_OPENED_IN|TF_OPENED_OUT|TF_OPENED_CONS)
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#define TF_GONE 0x00040 /* Device node is gone. */
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#define TF_OPENCLOSE 0x00080 /* Device is in open()/close(). */
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#define TF_ASYNC 0x00100 /* Asynchronous I/O enabled. */
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#define TF_LITERAL 0x00200 /* Accept the next character literally. */
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#define TF_HIWAT_IN 0x00400 /* We've reached the input watermark. */
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#define TF_HIWAT_OUT 0x00800 /* We've reached the output watermark. */
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#define TF_HIWAT (TF_HIWAT_IN|TF_HIWAT_OUT)
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#define TF_STOPPED 0x01000 /* Output flow control - stopped. */
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#define TF_EXCLUDE 0x02000 /* Exclusive access. */
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#define TF_BYPASS 0x04000 /* Optimized input path. */
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#define TF_ZOMBIE 0x08000 /* Modem disconnect received. */
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#define TF_HOOK 0x10000 /* TTY has hook attached. */
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#define TF_BUSY_IN 0x20000 /* Process busy in read() -- not supported. */
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#define TF_BUSY_OUT 0x40000 /* Process busy in write(). */
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#define TF_BUSY (TF_BUSY_IN|TF_BUSY_OUT)
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unsigned int t_revokecnt; /* (t) revoke() count. */
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/* Buffering mechanisms. */
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struct ttyinq t_inq; /* (t) Input queue. */
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size_t t_inlow; /* (t) Input low watermark. */
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struct ttyoutq t_outq; /* (t) Output queue. */
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size_t t_outlow; /* (t) Output low watermark. */
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/* Sleeping mechanisms. */
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struct cv t_inwait; /* (t) Input wait queue. */
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struct cv t_outwait; /* (t) Output wait queue. */
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struct cv t_outserwait; /* (t) Serial output wait queue. */
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struct cv t_bgwait; /* (t) Background wait queue. */
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struct cv t_dcdwait; /* (t) Carrier Detect wait queue. */
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/* Polling mechanisms. */
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struct selinfo t_inpoll; /* (t) Input poll queue. */
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struct selinfo t_outpoll; /* (t) Output poll queue. */
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struct sigio *t_sigio; /* (t) Asynchronous I/O. */
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struct termios t_termios; /* (t) I/O processing flags. */
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struct winsize t_winsize; /* (t) Window size. */
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unsigned int t_column; /* (t) Current cursor position. */
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unsigned int t_writepos; /* (t) Where input was interrupted. */
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int t_compatflags; /* (t) COMPAT_43TTY flags. */
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/* Init/lock-state devices. */
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struct termios t_termios_init_in; /* tty%s.init. */
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struct termios t_termios_lock_in; /* tty%s.lock. */
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struct termios t_termios_init_out; /* cua%s.init. */
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struct termios t_termios_lock_out; /* cua%s.lock. */
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struct ttydevsw *t_devsw; /* (c) Driver hooks. */
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struct ttyhook *t_hook; /* (t) Capture/inject hook. */
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/* Process signal delivery. */
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struct pgrp *t_pgrp; /* (t) Foreground process group. */
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struct session *t_session; /* (t) Associated session. */
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unsigned int t_sessioncnt; /* (t) Backpointing sessions. */
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void *t_devswsoftc; /* (c) Soft config, for drivers. */
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void *t_hooksoftc; /* (t) Soft config, for hooks. */
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struct cdev *t_dev; /* (c) Primary character device. */
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};
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/*
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* Userland version of struct tty, for sysctl kern.ttys
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*/
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struct xtty {
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size_t xt_size; /* Structure size. */
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size_t xt_insize; /* Input queue size. */
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size_t xt_incc; /* Canonicalized characters. */
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size_t xt_inlc; /* Input line charaters. */
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size_t xt_inlow; /* Input low watermark. */
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size_t xt_outsize; /* Output queue size. */
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size_t xt_outcc; /* Output queue usage. */
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size_t xt_outlow; /* Output low watermark. */
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unsigned int xt_column; /* Current column position. */
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pid_t xt_pgid; /* Foreground process group. */
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pid_t xt_sid; /* Session. */
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unsigned int xt_flags; /* Terminal option flags. */
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dev_t xt_dev; /* Userland device. */
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};
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#ifdef _KERNEL
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/* Used to distinguish between normal, callout, lock and init devices. */
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#define TTYUNIT_INIT 0x1
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#define TTYUNIT_LOCK 0x2
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#define TTYUNIT_CALLOUT 0x4
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/* Allocation and deallocation. */
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struct tty *tty_alloc(struct ttydevsw *tsw, void *softc);
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struct tty *tty_alloc_mutex(struct ttydevsw *tsw, void *softc, struct mtx *mtx);
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void tty_rel_pgrp(struct tty *tp, struct pgrp *pgrp);
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void tty_rel_sess(struct tty *tp, struct session *sess);
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void tty_rel_gone(struct tty *tp);
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#define tty_lock(tp) mtx_lock((tp)->t_mtx)
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#define tty_unlock(tp) mtx_unlock((tp)->t_mtx)
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#define tty_lock_owned(tp) mtx_owned((tp)->t_mtx)
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#define tty_lock_assert(tp,ma) mtx_assert((tp)->t_mtx, (ma))
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#define tty_getlock(tp) ((tp)->t_mtx)
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/* Device node creation. */
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int tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
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const char *fmt, ...) __printflike(4, 5);
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#define TTYMK_CLONING 0x1
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#define tty_makedev(tp, cred, fmt, ...) \
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(void )tty_makedevf((tp), (cred), 0, (fmt), ## __VA_ARGS__)
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#define tty_makealias(tp,fmt,...) \
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make_dev_alias((tp)->t_dev, fmt, ## __VA_ARGS__)
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/* Signalling processes. */
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void tty_signal_sessleader(struct tty *tp, int signal);
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void tty_signal_pgrp(struct tty *tp, int signal);
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/* Waking up readers/writers. */
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int tty_wait(struct tty *tp, struct cv *cv);
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int tty_wait_background(struct tty *tp, struct thread *td, int sig);
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int tty_timedwait(struct tty *tp, struct cv *cv, int timo);
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void tty_wakeup(struct tty *tp, int flags);
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/* System messages. */
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int tty_checkoutq(struct tty *tp);
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int tty_putchar(struct tty *tp, char c);
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int tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
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struct thread *td);
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int tty_ioctl_compat(struct tty *tp, u_long cmd, caddr_t data,
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int fflag, struct thread *td);
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void tty_set_winsize(struct tty *tp, const struct winsize *wsz);
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void tty_init_console(struct tty *tp, speed_t speed);
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void tty_flush(struct tty *tp, int flags);
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void tty_hiwat_in_block(struct tty *tp);
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void tty_hiwat_in_unblock(struct tty *tp);
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dev_t tty_udev(struct tty *tp);
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#define tty_opened(tp) ((tp)->t_flags & TF_OPENED)
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#define tty_gone(tp) ((tp)->t_flags & TF_GONE)
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#define tty_softc(tp) ((tp)->t_devswsoftc)
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#define tty_devname(tp) devtoname((tp)->t_dev)
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/* Status line printing. */
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void tty_info(struct tty *tp);
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/* /dev/console selection. */
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void ttyconsdev_select(const char *name);
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/* Pseudo-terminal hooks. */
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int pts_alloc(int fflags, struct thread *td, struct file *fp);
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int pts_alloc_external(int fd, struct thread *td, struct file *fp,
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struct cdev *dev, const char *name);
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/* Drivers and line disciplines also need to call these. */
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#include <sys/ttydisc.h>
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#include <sys/ttydevsw.h>
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#include <sys/ttyhook.h>
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#endif /* _KERNEL */
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#endif /* !_SYS_TTY_H_ */
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