/* * '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#define MAX_CONSOLES	8#define NR_SERIALS	2#define NR_PTYS		4extern int NR_CONSOLES;#include <termios.h>#define TTY_BUF_SIZE 1024struct tty_queue {	unsigned long data;	unsigned long head;	unsigned long tail;	struct task_struct * proc_list;	char buf[TTY_BUF_SIZE];};#define IS_A_CONSOLE(min)	(((min) & 0xC0) == 0x00)#define IS_A_SERIAL(min)	(((min) & 0xC0) == 0x40)#define IS_A_PTY(min)		((min) & 0x80)#define IS_A_PTY_MASTER(min)	(((min) & 0xC0) == 0x80)#define IS_A_PTY_SLAVE(min)	(((min) & 0xC0) == 0xC0)#define PTY_OTHER(min)		((min) ^ 0x40)#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) \(void)({c=(queue)->buf[(queue)->tail];INC((queue)->tail);})#define PUTCH(c,queue) \(void)({(queue)->buf[(queue)->head]=(c);INC((queue)->head);})#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])#define SUSPEND_CHAR(tty) ((tty)->termios.c_cc[VSUSP])struct tty_struct {	struct termios termios;	int pgrp;	int session;	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[];extern int fg_console;#define TTY_TABLE(nr) \(tty_table + ((nr) ? (((nr) < 64)? (nr)-1:(nr))	: fg_console))/*	intr=^C		quit=^|		erase=del	kill=^U	eof=^D		vtime=\0	vmin=\1		sxtc=\0	start=^Q	stop=^S		susp=^Z		eol=\0	reprint=^R	discard=^U	werase=^W	lnext=^V	eol2=\0*/#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\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 con_write(struct tty_struct * tty);void rs_write(struct tty_struct * tty);void mpty_write(struct tty_struct * tty);void spty_write(struct tty_struct * tty);void copy_to_cooked(struct tty_struct * tty);void update_screen(void);#endif