include/linux/tty.h - pub/scm/linux/kernel/git/nico/archive - Git at Google

 #ifndef _LINUX_TTY_H
 #define _LINUX_TTY_H

 /*
  * 'tty.h' defines some structures used by tty_io.c and some defines.
  */

 #include <linux/termios.h>

 #include <asm/system.h>

 #define NR_CONSOLES	8
 #define NR_LDISCS	16

 /*
  * These are set up by the setup-routine at boot-time:
  */

 struct screen_info {
 	unsigned char  orig_x;
 	unsigned char  orig_y;
 	unsigned char  unused1[2];
 	unsigned short orig_video_page;
 	unsigned char  orig_video_mode;
 	unsigned char  orig_video_cols;
 	unsigned short orig_video_ega_ax;
 	unsigned short orig_video_ega_bx;
 	unsigned short orig_video_ega_cx;
 	unsigned char  orig_video_lines;
 };

 extern struct screen_info screen_info;

 #define ORIG_X			(screen_info.orig_x)
 #define ORIG_Y			(screen_info.orig_y)
 #define ORIG_VIDEO_PAGE		(screen_info.orig_video_page)
 #define ORIG_VIDEO_MODE		(screen_info.orig_video_mode)
 #define ORIG_VIDEO_COLS 	(screen_info.orig_video_cols)
 #define ORIG_VIDEO_EGA_AX	(screen_info.orig_video_ega_ax)
 #define ORIG_VIDEO_EGA_BX	(screen_info.orig_video_ega_bx)
 #define ORIG_VIDEO_EGA_CX	(screen_info.orig_video_ega_cx)
 #define ORIG_VIDEO_LINES	(screen_info.orig_video_lines)

 #define VIDEO_TYPE_MDA		0x10	/* Monochrome Text Display	*/
 #define VIDEO_TYPE_CGA		0x11	/* CGA Display 			*/
 #define VIDEO_TYPE_EGAM		0x20	/* EGA/VGA in Monochrome Mode	*/
 #define VIDEO_TYPE_EGAC		0x21	/* EGA/VGA in Color Mode	*/

 /*
  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  * a c_cc[] character, but indicates that a particular special character
  * isn't in use (eg VINTR ahs no character etc)
  */
 #define __DISABLED_CHAR '\0'

 /*
  * See comment for the tty_struct structure before changing
  * TTY_BUF_SIZE.  Actually, there should be different sized tty_queue
  * structures for different purposes.  1024 bytes for the transmit
  * queue is way overkill.  TYT, 9/14/92
  */
 #define TTY_BUF_SIZE 1024	/* Must be a power of 2 */

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

 struct serial_struct {
 	int	type;
 	int	line;
 	int	port;
 	int	irq;
 	int	flags;
 	int	xmit_fifo_size;
 	int	custom_divisor;
 	int	baud_base;
 	char	close_delay;
 	char	reserved_char[3];
 	int	reserved[6];
 };

 /*
  * These are the supported serial types.
  */
 #define PORT_UNKNOWN	0
 #define PORT_8250	1
 #define PORT_16450	2
 #define PORT_16550	3
 #define PORT_16550A	4
 #define PORT_MAX	4

 /*
  * Definitions for async_struct (and serial_struct) flags field
  */
 #define ASYNC_HUP_NOTIFY 0x0001 /* Notify blocked open on hangups */
 #define ASYNC_FOURPORT  0x0002	/* Set OU1, OUT2 per AST Fourport settings */
 #define ASYNC_SAK	0x0004	/* Secure Attention Key (Orange book) */

 #define ASYNC_SPD_MASK	0x0030
 #define ASYNC_SPD_HI	0x0010	/* Use 56000 instead of 38400 bps */
 #define ASYNC_SPD_VHI	0x0020  /* Use 115200 instead of 38400 bps */
 #define ASYNC_SPD_CUST	0x0030  /* Use user-specified divisor */

 #define ASYNC_SKIP_TEST	0x0040 /* Skip UART test during autoconfiguration */
 #define ASYNC_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */

 #define ASYNC_FLAGS	0x00F7	/* Possible legal async flags */

 /* Internal flags used only by kernel/chr_drv/serial.c */
 #define ASYNC_INITIALIZED	0x80000000 /* Serial port was initialized */
 #define ASYNC_CALLOUT_ACTIVE	0x40000000 /* Call out device is active */
 #define ASYNC_NORMAL_ACTIVE	0x20000000 /* Normal device is active */
 #define ASYNC_BOOT_AUTOCONF	0x10000000 /* Autoconfigure port on bootup */

 #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 SL_TO_DEV(line)		((line) | 0x40)
 #define DEV_TO_SL(min)		((min) & 0x3F)

 #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))

 extern void put_tty_queue(char c, struct tty_queue * queue);
 extern int get_tty_queue(struct tty_queue * queue);

 #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 WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 #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])
 #define LNEXT_CHAR(tty)	((tty)->termios->c_cc[VLNEXT])

 #define _L_FLAG(tty,f)	((tty)->termios->c_lflag & f)
 #define _I_FLAG(tty,f)	((tty)->termios->c_iflag & f)
 #define _O_FLAG(tty,f)	((tty)->termios->c_oflag & f)
 #define _C_FLAG(tty,f)	((tty)->termios->c_cflag & f)

 #define L_CANON(tty)	_L_FLAG((tty),ICANON)
 #define L_ISIG(tty)	_L_FLAG((tty),ISIG)
 #define L_ECHO(tty)	_L_FLAG((tty),ECHO)
 #define L_ECHOE(tty)	_L_FLAG((tty),ECHOE)
 #define L_ECHOK(tty)	_L_FLAG((tty),ECHOK)
 #define L_ECHONL(tty)	_L_FLAG((tty),ECHONL)
 #define L_ECHOCTL(tty)	_L_FLAG((tty),ECHOCTL)
 #define L_ECHOKE(tty)	_L_FLAG((tty),ECHOKE)
 #define L_TOSTOP(tty)	_L_FLAG((tty),TOSTOP)

 #define I_IGNBRK(tty)	_I_FLAG((tty),IGNBRK)
 #define I_BRKINT(tty)	_I_FLAG((tty),BRKINT)
 #define I_IGNPAR(tty)	_I_FLAG((tty),IGNPAR)
 #define I_PARMRK(tty)	_I_FLAG((tty),PARMRK)
 #define I_INPCK(tty)	_I_FLAG((tty),INPCK)
 #define I_UCLC(tty)	_I_FLAG((tty),IUCLC)
 #define I_NLCR(tty)	_I_FLAG((tty),INLCR)
 #define I_CRNL(tty)	_I_FLAG((tty),ICRNL)
 #define I_NOCR(tty)	_I_FLAG((tty),IGNCR)
 #define I_IXON(tty)	_I_FLAG((tty),IXON)
 #define I_IXANY(tty)	_I_FLAG((tty),IXANY)
 #define I_STRP(tty)	_I_FLAG((tty),ISTRIP)

 #define O_POST(tty)	_O_FLAG((tty),OPOST)
 #define O_LCUC(tty)	_O_FLAG((tty),OLCUC)
 #define O_NLCR(tty)	_O_FLAG((tty),ONLCR)
 #define O_CRNL(tty)	_O_FLAG((tty),OCRNL)
 #define O_NOCR(tty)	_O_FLAG((tty),ONOCR)
 #define O_NLRET(tty)	_O_FLAG((tty),ONLRET)
 #define O_TABDLY(tty)	_O_FLAG((tty),TABDLY)

 #define C_LOCAL(tty)	_C_FLAG((tty),CLOCAL)
 #define C_RTSCTS(tty)	_C_FLAG((tty),CRTSCTS)
 #define C_SPEED(tty)	((tty)->termios->c_cflag & CBAUD)
 #define C_HUP(tty)	(C_SPEED((tty)) == B0)

 /*
  * Where all of the state associated with a tty is kept while the tty
  * is open.  Since the termios state should be kept even if the tty
  * has been closed --- for things like the baud rate, etc --- it is
  * not stored here, but rather a pointer to the real state is stored
  * here.  Possible the winsize structure should have the same
  * treatment, but (1) the default 80x24 is usually right and (2) it's
  * most often used by a windowing system, which will set the correct
  * size each time the window is created or resized anyway.
  * IMPORTANT: since this structure is dynamically allocated, it must
  * be no larger than 4096 bytes.  Changing TTY_BUF_SIZE will change
  * the size of this structure, and it needs to be done with care.
  * 						- TYT, 9/14/92
  */
 struct tty_struct {
 	struct termios *termios;
 	int pgrp;
 	int session;
 	unsigned char stopped:1, status_changed:1, packet:1, lnext:1;
 	unsigned char char_error:2;
 	unsigned char ctrl_status;
 	short line;
 	int disc;
 	int flags;
 	int count;
 	int column;
 	struct winsize winsize;
 	int  (*open)(struct tty_struct * tty, struct file * filp);
 	void (*close)(struct tty_struct * tty, struct file * filp);
 	void (*write)(struct tty_struct * tty);
 	int  (*ioctl)(struct tty_struct *tty, struct file * file,
 		    unsigned int cmd, unsigned long arg);
 	void (*throttle)(struct tty_struct * tty, int status);
 	void (*set_termios)(struct tty_struct *tty, struct termios * old);
 	struct tty_struct *link;
 	unsigned char *write_data_ptr;
 	int write_data_cnt;
 	void (*write_data_callback)(void * data);
 	void * write_data_arg;
 	int readq_flags[TTY_BUF_SIZE/32];
 	struct tty_queue read_q;
 	struct tty_queue write_q;
 	struct tty_queue secondary;
 };

 struct tty_ldisc {
 	int	flags;
 	/*
 	 * The following routines are called from above.
 	 */
 	int	(*open)(struct tty_struct *);
 	void	(*close)(struct tty_struct *);
 	int	(*read)(struct tty_struct * tty, struct file * file,
 			char * buf, int nr);
 	int	(*write)(struct tty_struct * tty, struct file * file,
 			 char * buf, int nr);
 	int	(*ioctl)(struct tty_struct * tty, struct file * file,
 			 unsigned int cmd, unsigned long arg);
 	/*
 	 * The following routines are called from below.
 	 */
 	void	(*handler)(struct tty_struct *);
 };

 #define LDISC_FLAG_DEFINED	0x00000001

 /*
  * These are the different types of thottle status which can be sent
  * to the low-level tty driver.  The tty_io.c layer is responsible for
  * notifying the low-level tty driver of the following conditions:
  * secondary queue full, secondary queue available, and read queue
  * available.  The low-level driver must send the read queue full
  * command to itself, if it is interested in that condition.
  *
  * Note that the low-level tty driver may elect to ignore one or both
  * of these conditions; normally, however, it will use ^S/^Q or some
  * sort of hardware flow control to regulate the input to try to avoid
  * overflow.  While the low-level driver is responsible for all
  * receiving flow control, note that the ^S/^Q handling (but not
  * hardware flow control) is handled by the upper layer, in
  * copy_to_cooked.
  */
 #define TTY_THROTTLE_SQ_FULL	1
 #define TTY_THROTTLE_SQ_AVAIL	2
 #define TTY_THROTTLE_RQ_FULL	3
 #define TTY_THROTTLE_RQ_AVAIL	4

 /*
  * This defines the low- and high-watermarks for the various conditions.
  * Again, the low-level driver is free to ignore any of these, and has
  * to implement RQ_THREHOLD_LW for itself if it wants it.
  */
 #define SQ_THRESHOLD_LW	16
 #define SQ_THRESHOLD_HW 768
 #define RQ_THRESHOLD_LW 16
 #define RQ_THRESHOLD_HW 768

 /*
  * These bits are used in the flags field of the tty structure.
  *
  * So that interrupts won't be able to mess up the queues,
  * copy_to_cooked must be atomic with repect to itself, as must
  * tty->write.  Thus, you must use the inline functions set_bit() and
  * clear_bit() to make things atomic.
  */
 #define TTY_WRITE_BUSY 0
 #define TTY_READ_BUSY 1
 #define TTY_CR_PENDING 2
 #define TTY_SQ_THROTTLED 3
 #define TTY_RQ_THROTTLED 4
 #define TTY_IO_ERROR 5
 #define TTY_SLAVE_OPENED 6

 /*
  * When a break, frame error, or parity error happens, these codes are
  * stuffed into the read queue, and the relevant bit in readq_flag bit
  * array is set.
  */
 #define TTY_BREAK	1
 #define TTY_FRAME	2
 #define TTY_PARITY	3

 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 #define TTY_READ_FLUSH(tty) tty_read_flush((tty))

 extern void tty_write_flush(struct tty_struct *);
 extern void tty_read_flush(struct tty_struct *);

 extern struct tty_struct *tty_table[];
 extern int tty_check_write[];
 extern struct tty_struct * redirect;
 extern struct tty_ldisc ldiscs[];
 extern int fg_console;
 extern unsigned long video_num_columns;
 extern unsigned long video_num_lines;
 extern struct wait_queue * keypress_wait;

 #define TTY_TABLE_IDX(nr)	((nr) ? (nr) : (fg_console+1))
 #define TTY_TABLE(nr) 		(tty_table[TTY_TABLE_IDX(nr)])

 /*	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"

 extern long rs_init(long);
 extern long lp_init(long);
 extern long con_init(long);
 extern long tty_init(long);

 extern void flush_input(struct tty_struct * tty);
 extern void flush_output(struct tty_struct * tty);
 extern void wait_until_sent(struct tty_struct * tty);
 extern void copy_to_cooked(struct tty_struct * tty);
 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 			     int buflen);
 extern int tty_write_data(struct tty_struct *tty, char *bufp, int buflen,
 			  void (*callback)(void * data), void * callarg);

 extern int tty_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 extern int is_orphaned_pgrp(int pgrp);
 extern int is_ignored(int sig);
 extern int tty_signal(int sig, struct tty_struct *tty);
 extern int kill_pg(int pgrp, int sig, int priv);
 extern int kill_sl(int sess, int sig, int priv);
 extern void tty_hangup(struct tty_struct * tty);
 extern void tty_vhangup(struct tty_struct * tty);
 extern void tty_unhangup(struct file *filp);
 extern int tty_hung_up_p(struct file * filp);
 extern void do_SAK(struct tty_struct *tty);

 /* tty write functions */

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

 /* serial.c */

 extern int  rs_open(struct tty_struct * tty, struct file * filp);

 /* pty.c */

 extern int  pty_open(struct tty_struct * tty, struct file * filp);

 /* console.c */

 extern int con_open(struct tty_struct * tty, struct file * filp);
 extern void update_screen(int new_console);
 extern void blank_screen(void);
 extern void unblank_screen(void);

 /* vt.c */

 extern int vt_ioctl(struct tty_struct *tty, struct file * file,
 		    unsigned int cmd, unsigned long arg);

 #endif
	#ifndef _LINUX_TTY_H
	#define _LINUX_TTY_H

	/*
	* 'tty.h' defines some structures used by tty_io.c and some defines.
	*/

	#include <linux/termios.h>

	#include <asm/system.h>

	#define NR_CONSOLES 8
	#define NR_LDISCS 16

	/*
	* These are set up by the setup-routine at boot-time:
	*/

	struct screen_info {
	unsigned char orig_x;
	unsigned char orig_y;
	unsigned char unused1[2];
	unsigned short orig_video_page;
	unsigned char orig_video_mode;
	unsigned char orig_video_cols;
	unsigned short orig_video_ega_ax;
	unsigned short orig_video_ega_bx;
	unsigned short orig_video_ega_cx;
	unsigned char orig_video_lines;
	};

	extern struct screen_info screen_info;

	#define ORIG_X (screen_info.orig_x)
	#define ORIG_Y (screen_info.orig_y)
	#define ORIG_VIDEO_PAGE (screen_info.orig_video_page)
	#define ORIG_VIDEO_MODE (screen_info.orig_video_mode)
	#define ORIG_VIDEO_COLS (screen_info.orig_video_cols)
	#define ORIG_VIDEO_EGA_AX (screen_info.orig_video_ega_ax)
	#define ORIG_VIDEO_EGA_BX (screen_info.orig_video_ega_bx)
	#define ORIG_VIDEO_EGA_CX (screen_info.orig_video_ega_cx)
	#define ORIG_VIDEO_LINES (screen_info.orig_video_lines)

	#define VIDEO_TYPE_MDA 0x10 /* Monochrome Text Display */
	#define VIDEO_TYPE_CGA 0x11 /* CGA Display */
	#define VIDEO_TYPE_EGAM 0x20 /* EGA/VGA in Monochrome Mode */
	#define VIDEO_TYPE_EGAC 0x21 /* EGA/VGA in Color Mode */

	/*
	* This character is the same as _POSIX_VDISABLE: it cannot be used as
	* a c_cc[] character, but indicates that a particular special character
	* isn't in use (eg VINTR ahs no character etc)
	*/
	#define __DISABLED_CHAR '\0'

	/*
	* See comment for the tty_struct structure before changing
	* TTY_BUF_SIZE. Actually, there should be different sized tty_queue
	* structures for different purposes. 1024 bytes for the transmit
	* queue is way overkill. TYT, 9/14/92
	*/
	#define TTY_BUF_SIZE 1024 /* Must be a power of 2 */

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

	struct serial_struct {
	int type;
	int line;
	int port;
	int irq;
	int flags;
	int xmit_fifo_size;
	int custom_divisor;
	int baud_base;
	char close_delay;
	char reserved_char[3];
	int reserved[6];
	};

	/*
	* These are the supported serial types.
	*/
	#define PORT_UNKNOWN 0
	#define PORT_8250 1
	#define PORT_16450 2
	#define PORT_16550 3
	#define PORT_16550A 4
	#define PORT_MAX 4

	/*
	* Definitions for async_struct (and serial_struct) flags field
	*/
	#define ASYNC_HUP_NOTIFY 0x0001 /* Notify blocked open on hangups */
	#define ASYNC_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
	#define ASYNC_SAK 0x0004 /* Secure Attention Key (Orange book) */

	#define ASYNC_SPD_MASK 0x0030
	#define ASYNC_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
	#define ASYNC_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
	#define ASYNC_SPD_CUST 0x0030 /* Use user-specified divisor */

	#define ASYNC_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
	#define ASYNC_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */

	#define ASYNC_FLAGS 0x00F7 /* Possible legal async flags */

	/* Internal flags used only by kernel/chr_drv/serial.c */
	#define ASYNC_INITIALIZED 0x80000000 /* Serial port was initialized */
	#define ASYNC_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
	#define ASYNC_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
	#define ASYNC_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */

	#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 SL_TO_DEV(line) ((line) \| 0x40)
	#define DEV_TO_SL(min) ((min) & 0x3F)

	#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))

	extern void put_tty_queue(char c, struct tty_queue * queue);
	extern int get_tty_queue(struct tty_queue * queue);

	#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 WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
	#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])
	#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])

	#define _L_FLAG(tty,f) ((tty)->termios->c_lflag & f)
	#define _I_FLAG(tty,f) ((tty)->termios->c_iflag & f)
	#define _O_FLAG(tty,f) ((tty)->termios->c_oflag & f)
	#define _C_FLAG(tty,f) ((tty)->termios->c_cflag & f)

	#define L_CANON(tty) _L_FLAG((tty),ICANON)
	#define L_ISIG(tty) _L_FLAG((tty),ISIG)
	#define L_ECHO(tty) _L_FLAG((tty),ECHO)
	#define L_ECHOE(tty) _L_FLAG((tty),ECHOE)
	#define L_ECHOK(tty) _L_FLAG((tty),ECHOK)
	#define L_ECHONL(tty) _L_FLAG((tty),ECHONL)
	#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
	#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
	#define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP)

	#define I_IGNBRK(tty) _I_FLAG((tty),IGNBRK)
	#define I_BRKINT(tty) _I_FLAG((tty),BRKINT)
	#define I_IGNPAR(tty) _I_FLAG((tty),IGNPAR)
	#define I_PARMRK(tty) _I_FLAG((tty),PARMRK)
	#define I_INPCK(tty) _I_FLAG((tty),INPCK)
	#define I_UCLC(tty) _I_FLAG((tty),IUCLC)
	#define I_NLCR(tty) _I_FLAG((tty),INLCR)
	#define I_CRNL(tty) _I_FLAG((tty),ICRNL)
	#define I_NOCR(tty) _I_FLAG((tty),IGNCR)
	#define I_IXON(tty) _I_FLAG((tty),IXON)
	#define I_IXANY(tty) _I_FLAG((tty),IXANY)
	#define I_STRP(tty) _I_FLAG((tty),ISTRIP)

	#define O_POST(tty) _O_FLAG((tty),OPOST)
	#define O_LCUC(tty) _O_FLAG((tty),OLCUC)
	#define O_NLCR(tty) _O_FLAG((tty),ONLCR)
	#define O_CRNL(tty) _O_FLAG((tty),OCRNL)
	#define O_NOCR(tty) _O_FLAG((tty),ONOCR)
	#define O_NLRET(tty) _O_FLAG((tty),ONLRET)
	#define O_TABDLY(tty) _O_FLAG((tty),TABDLY)

	#define C_LOCAL(tty) _C_FLAG((tty),CLOCAL)
	#define C_RTSCTS(tty) _C_FLAG((tty),CRTSCTS)
	#define C_SPEED(tty) ((tty)->termios->c_cflag & CBAUD)
	#define C_HUP(tty) (C_SPEED((tty)) == B0)

	/*
	* Where all of the state associated with a tty is kept while the tty
	* is open. Since the termios state should be kept even if the tty
	* has been closed --- for things like the baud rate, etc --- it is
	* not stored here, but rather a pointer to the real state is stored
	* here. Possible the winsize structure should have the same
	* treatment, but (1) the default 80x24 is usually right and (2) it's
	* most often used by a windowing system, which will set the correct
	* size each time the window is created or resized anyway.
	* IMPORTANT: since this structure is dynamically allocated, it must
	* be no larger than 4096 bytes. Changing TTY_BUF_SIZE will change
	* the size of this structure, and it needs to be done with care.
	* - TYT, 9/14/92
	*/
	struct tty_struct {
	struct termios *termios;
	int pgrp;
	int session;
	unsigned char stopped:1, status_changed:1, packet:1, lnext:1;
	unsigned char char_error:2;
	unsigned char ctrl_status;
	short line;
	int disc;
	int flags;
	int count;
	int column;
	struct winsize winsize;
	int (open)(struct tty_struct tty, struct file * filp);
	void (close)(struct tty_struct tty, struct file * filp);
	void (write)(struct tty_struct tty);
	int (ioctl)(struct tty_struct tty, struct file * file,
	unsigned int cmd, unsigned long arg);
	void (throttle)(struct tty_struct tty, int status);
	void (set_termios)(struct tty_struct tty, struct termios * old);
	struct tty_struct *link;
	unsigned char *write_data_ptr;
	int write_data_cnt;
	void (write_data_callback)(void data);
	void * write_data_arg;
	int readq_flags[TTY_BUF_SIZE/32];
	struct tty_queue read_q;
	struct tty_queue write_q;
	struct tty_queue secondary;
	};

	struct tty_ldisc {
	int flags;
	/*
	* The following routines are called from above.
	*/
	int (open)(struct tty_struct );
	void (close)(struct tty_struct );
	int (read)(struct tty_struct tty, struct file * file,
	char * buf, int nr);
	int (write)(struct tty_struct tty, struct file * file,
	char * buf, int nr);
	int (ioctl)(struct tty_struct tty, struct file * file,
	unsigned int cmd, unsigned long arg);
	/*
	* The following routines are called from below.
	*/
	void (handler)(struct tty_struct );
	};

	#define LDISC_FLAG_DEFINED 0x00000001

	/*
	* These are the different types of thottle status which can be sent
	* to the low-level tty driver. The tty_io.c layer is responsible for
	* notifying the low-level tty driver of the following conditions:
	* secondary queue full, secondary queue available, and read queue
	* available. The low-level driver must send the read queue full
	* command to itself, if it is interested in that condition.
	*
	* Note that the low-level tty driver may elect to ignore one or both
	* of these conditions; normally, however, it will use ^S/^Q or some
	* sort of hardware flow control to regulate the input to try to avoid
	* overflow. While the low-level driver is responsible for all
	* receiving flow control, note that the ^S/^Q handling (but not
	* hardware flow control) is handled by the upper layer, in
	* copy_to_cooked.
	*/
	#define TTY_THROTTLE_SQ_FULL 1
	#define TTY_THROTTLE_SQ_AVAIL 2
	#define TTY_THROTTLE_RQ_FULL 3
	#define TTY_THROTTLE_RQ_AVAIL 4

	/*
	* This defines the low- and high-watermarks for the various conditions.
	* Again, the low-level driver is free to ignore any of these, and has
	* to implement RQ_THREHOLD_LW for itself if it wants it.
	*/
	#define SQ_THRESHOLD_LW 16
	#define SQ_THRESHOLD_HW 768
	#define RQ_THRESHOLD_LW 16
	#define RQ_THRESHOLD_HW 768

	/*
	* These bits are used in the flags field of the tty structure.
	*
	* So that interrupts won't be able to mess up the queues,
	* copy_to_cooked must be atomic with repect to itself, as must
	* tty->write. Thus, you must use the inline functions set_bit() and
	* clear_bit() to make things atomic.
	*/
	#define TTY_WRITE_BUSY 0
	#define TTY_READ_BUSY 1
	#define TTY_CR_PENDING 2
	#define TTY_SQ_THROTTLED 3
	#define TTY_RQ_THROTTLED 4
	#define TTY_IO_ERROR 5
	#define TTY_SLAVE_OPENED 6

	/*
	* When a break, frame error, or parity error happens, these codes are
	* stuffed into the read queue, and the relevant bit in readq_flag bit
	* array is set.
	*/
	#define TTY_BREAK 1
	#define TTY_FRAME 2
	#define TTY_PARITY 3

	#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
	#define TTY_READ_FLUSH(tty) tty_read_flush((tty))

	extern void tty_write_flush(struct tty_struct *);
	extern void tty_read_flush(struct tty_struct *);

	extern struct tty_struct *tty_table[];
	extern int tty_check_write[];
	extern struct tty_struct * redirect;
	extern struct tty_ldisc ldiscs[];
	extern int fg_console;
	extern unsigned long video_num_columns;
	extern unsigned long video_num_lines;
	extern struct wait_queue * keypress_wait;

	#define TTY_TABLE_IDX(nr) ((nr) ? (nr) : (fg_console+1))
	#define TTY_TABLE(nr) (tty_table[TTY_TABLE_IDX(nr)])

	/* 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"

	extern long rs_init(long);
	extern long lp_init(long);
	extern long con_init(long);
	extern long tty_init(long);

	extern void flush_input(struct tty_struct * tty);
	extern void flush_output(struct tty_struct * tty);
	extern void wait_until_sent(struct tty_struct * tty);
	extern void copy_to_cooked(struct tty_struct * tty);
	extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
	extern int tty_read_raw_data(struct tty_struct tty, unsigned char bufp,
	int buflen);
	extern int tty_write_data(struct tty_struct tty, char bufp, int buflen,
	void (callback)(void data), void * callarg);

	extern int tty_ioctl(struct inode , struct file , unsigned int, unsigned long);
	extern int is_orphaned_pgrp(int pgrp);
	extern int is_ignored(int sig);
	extern int tty_signal(int sig, struct tty_struct *tty);
	extern int kill_pg(int pgrp, int sig, int priv);
	extern int kill_sl(int sess, int sig, int priv);
	extern void tty_hangup(struct tty_struct * tty);
	extern void tty_vhangup(struct tty_struct * tty);
	extern void tty_unhangup(struct file *filp);
	extern int tty_hung_up_p(struct file * filp);
	extern void do_SAK(struct tty_struct *tty);

	/* tty write functions */

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

	/* serial.c */

	extern int rs_open(struct tty_struct * tty, struct file * filp);

	/* pty.c */

	extern int pty_open(struct tty_struct * tty, struct file * filp);

	/* console.c */

	extern int con_open(struct tty_struct * tty, struct file * filp);
	extern void update_screen(int new_console);
	extern void blank_screen(void);
	extern void unblank_screen(void);

	/* vt.c */

	extern int vt_ioctl(struct tty_struct tty, struct file file,
	unsigned int cmd, unsigned long arg);

	#endif