/*-
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)tty.h	8.6 (Berkeley) 1/21/94
 * $FreeBSD: src/sys/sys/tty.h,v 1.53.2.1 2001/02/26 04:23:21 jlemon Exp $
 */

#ifndef _SYS_TTY_H_
#define	_SYS_TTY_H_

/*
 * Clists are character lists, which is a variable length linked list
 * of cblocks, with a count of the number of characters in the list.
 */
struct clist {
	int	c_cc;		/* Number of characters in the clist. */
	int	c_ccmax;	/* Max # chars for this clist. */
	int	c_cchead;	/* First char */
	int	c_unused01;
	short	*c_data;	/* linear data buffer (no longer chained) */
};

#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)

#include <sys/_termios.h>
#include <sys/event.h>
#include <sys/queue.h>
#include <sys/ttycom.h>
#ifdef _KERNEL
#include <sys/device.h>
#endif
#ifndef _SYS_THREAD_H_
#include <sys/thread.h>
#endif

/*
 * Per-tty structure.
 *
 * Should be split in two, into device and tty drivers.
 * Glue could be masks of what to echo and circular buffer
 * (low, high, timeout).
 */
struct tty {
	struct lwkt_token t_token;
	struct	clist t_rawq;		/* Device raw input queue. */
	long	t_rawcc;		/* Raw input queue statistics. */
	struct	clist t_canq;		/* Device canonical queue. */
	long	t_cancc;		/* Canonical queue statistics. */
	struct	clist t_outq;		/* Device output queue. */
	long	t_outcc;		/* Output queue statistics. */
	int	t_line;			/* Interface to device drivers. */
	struct cdev *t_dev;		/* Device. */
	int	t_state;		/* Device and driver (TS*) state. */
	int	t_flags;		/* Tty flags. */
	int     t_timeout;              /* Timeout for ttywait() */
	struct	pgrp *t_pgrp;		/* Foreground process group. */
	struct	session *t_session;	/* Enclosing session. */
	struct  sigio *t_sigio;		/* Information for async I/O. */
	struct	kqinfo t_rkq;		/* Tty read/oob kq. */
	struct	kqinfo t_wkq;		/* Tty write kq. */
	struct	termios t_termios;	/* Termios state. */
	struct	winsize t_winsize;	/* Window size. */
					/* Start output. */
	void	(*t_oproc) (struct tty *);
					/* Stop output. */
	void	(*t_stop) (struct tty *, int);
					/* Set hardware state. */
	int	(*t_param) (struct tty *, struct termios *);
	void	(*t_unhold) (struct tty *); /* callback to pty after unhold */
	void	*t_sc;			/* generic driver (u4b com) */
	void	*t_slsc;		/* if_sl.c, ppp_tty.c (disc) */
	int	t_column;		/* Tty output column. */
	int	t_rocount, t_rocol;	/* Tty. */
	int	t_ififosize;		/* Total size of upstream fifos. */
	int	t_ihiwat;		/* High water mark for input. */
	int	t_ilowat;		/* Low water mark for input. */
	speed_t	t_ispeedwat;		/* t_ispeed override for watermarks. */
	int	t_ohiwat;		/* High water mark for output. */
	int	t_olowat;		/* Low water mark for output. */
	speed_t	t_ospeedwat;		/* t_ospeed override for watermarks. */
	int	t_gen;			/* Generation number. */
	TAILQ_ENTRY(tty) t_list;	/* Global chain of ttys for pstat(8) */
	int	t_refs;			/* Reference count. */
};

#define	t_cc		t_termios.c_cc
#define	t_cflag		t_termios.c_cflag
#define	t_iflag		t_termios.c_iflag
#define	t_ispeed	t_termios.c_ispeed
#define	t_lflag		t_termios.c_lflag
#define	t_min		t_termios.c_min
#define	t_oflag		t_termios.c_oflag
#define	t_ospeed	t_termios.c_ospeed
#define	t_time		t_termios.c_time

#endif

/*
 * User data unfortunately has to be copied through buffers on the way to
 * and from clists.  The buffers are on the stack so their sizes must be
 * fairly small.
 */
#define	IBUFSIZ		384		/* Should be >= max value of MIN. */
#define	OBUFSIZ		100

#ifndef TTYHOG
#define	TTYHOG		1024
#endif

#ifdef _KERNEL
#define	TTMAXHIWAT	2048
#define	TTMINHIWAT	100
#define	TTMAXLOWAT	256
#define	TTMINLOWAT	32
#endif

/* These flags are kept in t_state. */
#define	TS_SO_OLOWAT	0x00001		/* Wake up when output <= low water. */
#define	TS_ASYNC	0x00002		/* Tty in async I/O mode. */
#define	TS_BUSY		0x00004		/* Draining output. */
#define	TS_CARR_ON	0x00008		/* Carrier is present. */
#define	TS_FLUSH	0x00010		/* Outq has been flushed during DMA. */
#define	TS_ISOPEN	0x00020		/* Open has completed. */
#define	TS_TBLOCK	0x00040		/* Further input blocked. */
#define	TS_TIMEOUT	0x00080		/* Wait for output char processing. */
#define	TS_TTSTOP	0x00100		/* Output paused. */
#ifdef notyet
#define	TS_WOPEN	0x00200		/* Open in progress. */
#endif
#define	TS_XCLUDE	0x00400		/* Tty requires exclusivity. */

/* State for intra-line fancy editing work. */
#define	TS_BKSL		0x00800		/* State for lowercase \ work. */
#define	TS_CNTTB	0x01000		/* Counting tab width, ignore FLUSHO. */
#define	TS_ERASE	0x02000		/* Within a \.../ for PRTRUB. */
#define	TS_LNCH		0x04000		/* Next character is literal. */
#define	TS_TYPEN	0x08000		/* Retyping suspended input (PENDIN). */
#define	TS_LOCAL	(TS_BKSL | TS_CNTTB | TS_ERASE | TS_LNCH | TS_TYPEN)

/* Extras. */
#define	TS_CAN_BYPASS_L_RINT 0x010000	/* Device in "raw" mode. */
#define	TS_CONNECTED	0x020000	/* Connection open. */
#define	TS_SNOOP	0x040000	/* Device is being snooped on. */
#define	TS_SO_OCOMPLETE	0x080000	/* Wake up when output completes. */
#define	TS_ZOMBIE	0x100000	/* Connection lost. */

/* Hardware flow-control-invoked bits. */
#define	TS_CAR_OFLOW	0x200000	/* For MDMBUF (XXX handle in driver). */
#ifdef notyet
#define	TS_CTS_OFLOW	0x400000	/* For CCTS_OFLOW. */
#define	TS_DSR_OFLOW	0x800000	/* For CDSR_OFLOW. */
#endif
#define TS_REGISTERED	0x1000000	/* ttyregister sanity check */
#define TS_MARKER	0x2000000	/* sysctl iteration marker */

/* Character type information. */
#define	ORDINARY	0
#define	CONTROL		1
#define	BACKSPACE	2
#define	NEWLINE		3
#define	TAB		4
#define	VTAB		5
#define	RETURN		6

struct speedtab {
	int sp_speed;			/* Speed. */
	int sp_code;			/* Code. */
};

/* Modem control commands (driver). */
#define	DMSET		0
#define	DMBIS		1
#define	DMBIC		2
#define	DMGET		3

/* Flags on a character passed to ttyinput. */
#define	TTY_CHARMASK	0x00ff		/* Character mask */
#define	TTY_QUOTE	0x0100		/* Character quoted */
#define	TTY_ERRORMASK	0xff000000	/* Error mask */
#define	TTY_FE		0x01000000	/* Framing error */
#define	TTY_PE		0x02000000	/* Parity error */
#define	TTY_OE		0x04000000	/* Overrun error */
#define	TTY_BI		0x08000000	/* Break condition */

/* Is tp controlling terminal for p? */
#define	isctty(p, tp)							\
	((p)->p_session == (tp)->t_session && ((p)->p_flags & P_CONTROLT))

/* Is p in background of tp? */
#define	isbackground(p, tp)						\
	(isctty((p), (tp)) && (p)->p_pgrp != (tp)->t_pgrp)

/* Unique sleep addresses. */
#define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
#define	TSA_HUP_OR_INPUT(tp)	((void *)&(tp)->t_rawq.c_cchead)
#define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq.c_ccmax)
#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
#define	TSA_PTC_READ(tp)	((void *)&(tp)->t_outq.c_cchead)
#define	TSA_PTC_WRITE(tp)	((void *)&(tp)->t_rawq.c_ccmax)
#define	TSA_PTS_READ(tp)	((void *)&(tp)->t_canq)

#ifdef _KERNEL

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_TTYS);
#endif

extern	struct tty *constty;	/* Temporary virtual console. */

int	 clist_btoq (char *cp, int cc, struct clist *q);
void	 clist_catq (struct clist *from, struct clist *to);
void	 clist_alloc_cblocks (struct clist *q, int ccmax);
void	 clist_free_cblocks (struct clist *q);
int	 clist_getc (struct clist *q);
int	 clist_unputc (struct clist *q);
void	 ndflush (struct clist *q, int cc);
void	*clist_nextc (struct clist *q, void *cp, int *c);
void	 nottystop (struct tty *tp, int rw);
int	 clist_putc (int c, struct clist *q);
int	 clist_qtob (struct clist *q, char *cp, int cc);
void	 termioschars (struct termios *t);
int	 tputchar (int c, struct tty *tp);
int	 ttcompat (struct tty *tp, u_long com, caddr_t data, int flag);
int	 ttioctl (struct tty *tp, u_long com, void *data, int flag);
int	 ttread (struct tty *tp, struct uio *uio, int flag);
int	 ttsetcompat (struct tty *tp, u_long *com, caddr_t data,
	    struct termios *term);
void	 ttsetwater (struct tty *tp);
int	 ttspeedtab (int speed, struct speedtab *table);
int	 ttstart (struct tty *tp);
void	 ttwakeup (struct tty *tp);
int	 ttwrite (struct tty *tp, struct uio *uio, int flag);
void	 ttwwakeup (struct tty *tp);
void	 ttyblock (struct tty *tp);
void	 ttychars (struct tty *tp);
int	 ttycheckoutq (struct tty *tp, int wait);
int	 ttyclose (struct tty *tp);
void	 ttyclearsession (struct tty *tp);
void	 ttyclosesession (struct session *, int);
void	 ttyflush (struct tty *tp, int rw);
void	 ttyhold (struct tty *tp);
void	 ttyunhold (struct tty *tp);
void	 ttyinfo (struct tty *tp);
int	 ttyinput (int c, struct tty *tp);
int	 ttylclose (struct tty *tp, int flag);
struct tty *ttymalloc (struct tty **tpp);
int	 ttymodem (struct tty *tp, int flag);
int	 ttyopen (cdev_t device, struct tty *tp);
int	 ttykqfilter (struct dev_kqfilter_args *);
int	 ttyread (struct dev_read_args *);
void	 ttyregister (struct tty *tp);
void	 ttyinit (struct tty *tp);
void	 ttyunregister (struct tty *tp);
int	 ttysleep (struct tty *tp, void *chan, int slpflags, char *wmesg,
	    int timeout);
int	 ttyrevoke (struct dev_revoke_args *);
int	 ttywait (struct tty *tp);
int	 ttywrite (struct dev_write_args *);

#endif /* _KERNEL */

#endif /* !_SYS_TTY_H_ */
