विकिविश्वविद्यालय से
 * 'tty.h' defines some structures used by tty_io.c and some defines.
 * NOTE! Don't touch this without checking that nothing in rs_io.s or
 * con_io.s breaks. Some constants are hardwired into the system (mainly
 * offsets into 'tty_queue'

#ifndef _TTY_H
#define _TTY_H

#include <termios.h>

#define TTY_BUF_SIZE 1024

struct tty_queue {
	unsigned long data;
	unsigned long head;
	unsigned long tail;
	struct task_struct * proc_list;
	char buf[TTY_BUF_SIZE];

#define INC(a) ((a) = ((a)+1) & (TTY_BUF_SIZE-1))
#define DEC(a) ((a) = ((a)-1) & (TTY_BUF_SIZE-1))
#define EMPTY(a) ((a).head == (a).tail)
#define LEFT(a) (((a).tail-(a).head-1)&(TTY_BUF_SIZE-1))
#define LAST(a) ((a).buf[(TTY_BUF_SIZE-1)&((a).head-1)])
#define FULL(a) (!LEFT(a))
#define CHARS(a) (((a).head-(a).tail)&(TTY_BUF_SIZE-1))
#define GETCH(queue,c) \
#define PUTCH(c,queue) \

#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])

struct tty_struct {
	struct termios termios;
	int pgrp;
	int stopped;
	void (*write)(struct tty_struct * tty);
	struct tty_queue read_q;
	struct tty_queue write_q;
	struct tty_queue secondary;

extern struct tty_struct tty_table[];

/*	intr=^C		quit=^|		erase=del	kill=^U
	eof=^D		vtime=\0	vmin=\1		sxtc=\0
	start=^Q	stop=^S		susp=^Y		eol=\0
	reprint=^R	discard=^U	werase=^W	lnext=^V
#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\031\0\022\017\027\026\0"

void rs_init(void);
void con_init(void);
void tty_init(void);

int tty_read(unsigned c, char * buf, int n);
int tty_write(unsigned c, char * buf, int n);

void rs_write(struct tty_struct * tty);
void con_write(struct tty_struct * tty);

void copy_to_cooked(struct tty_struct * tty);


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