include/linux/tty.h - kernel/msm-4.19 - Gitiles

 #ifndef _LINUX_TTY_H
 #define _LINUX_TTY_H

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

 #ifdef __KERNEL__
 #include <linux/fs.h>
 #include <linux/major.h>
 #include <linux/termios.h>
 #include <linux/workqueue.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_ldisc.h>
 #include <linux/mutex.h>

 #include <asm/system.h>


 /*
  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  * hardcoded at present.)
  */
 #define NR_PTYS	CONFIG_LEGACY_PTY_COUNT   /* Number of legacy ptys */
 #define NR_UNIX98_PTY_DEFAULT	4096      /* Default maximum for Unix98 ptys */
 #define NR_UNIX98_PTY_MAX	(1 << MINORBITS) /* Absolute limit */
 #define NR_LDISCS		16

 /*
  * 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 has no character etc)
  */
 #define __DISABLED_CHAR '\0'

 /*
  * This is the flip buffer used for the tty driver.  The buffer is
  * located in the tty structure, and is used as a high speed interface
  * between the tty driver and the tty line discipline.
  */
 #define TTY_FLIPBUF_SIZE 512

 struct tty_buffer {
 	struct tty_buffer *next;
 	char *char_buf_ptr;
 	unsigned char *flag_buf_ptr;
 	int used;
 	int size;
 	int commit;
 	int read;
 	/* Data points here */
 	unsigned long data[0];
 };

 struct tty_bufhead {
 	struct delayed_work work;
 	struct semaphore pty_sem;
 	spinlock_t lock;
 	struct tty_buffer *head;	/* Queue head */
 	struct tty_buffer *tail;	/* Active buffer */
 	struct tty_buffer *free;	/* Free queue head */
 	int memory_used;		/* Buffer space used excluding free queue */
 };
 /*
  * The pty uses char_buf and flag_buf as a contiguous buffer
  */
 #define PTY_BUF_SIZE	4*TTY_FLIPBUF_SIZE

 /*
  * When a break, frame error, or parity error happens, these codes are
  * stuffed into the flags buffer.
  */
 #define TTY_NORMAL	0
 #define TTY_BREAK	1
 #define TTY_FRAME	2
 #define TTY_PARITY	3
 #define TTY_OVERRUN	4

 #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 TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 #define LNEXT_CHAR(tty)	((tty)->termios->c_cc[VLNEXT])
 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])

 #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_FLAG(tty,f)	((tty)->termios->c_lflag & (f))

 #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_ISTRIP(tty)	_I_FLAG((tty),ISTRIP)
 #define I_INLCR(tty)	_I_FLAG((tty),INLCR)
 #define I_IGNCR(tty)	_I_FLAG((tty),IGNCR)
 #define I_ICRNL(tty)	_I_FLAG((tty),ICRNL)
 #define I_IUCLC(tty)	_I_FLAG((tty),IUCLC)
 #define I_IXON(tty)	_I_FLAG((tty),IXON)
 #define I_IXANY(tty)	_I_FLAG((tty),IXANY)
 #define I_IXOFF(tty)	_I_FLAG((tty),IXOFF)
 #define I_IMAXBEL(tty)	_I_FLAG((tty),IMAXBEL)
 #define I_IUTF8(tty)	_I_FLAG((tty),IUTF8)

 #define O_OPOST(tty)	_O_FLAG((tty),OPOST)
 #define O_OLCUC(tty)	_O_FLAG((tty),OLCUC)
 #define O_ONLCR(tty)	_O_FLAG((tty),ONLCR)
 #define O_OCRNL(tty)	_O_FLAG((tty),OCRNL)
 #define O_ONOCR(tty)	_O_FLAG((tty),ONOCR)
 #define O_ONLRET(tty)	_O_FLAG((tty),ONLRET)
 #define O_OFILL(tty)	_O_FLAG((tty),OFILL)
 #define O_OFDEL(tty)	_O_FLAG((tty),OFDEL)
 #define O_NLDLY(tty)	_O_FLAG((tty),NLDLY)
 #define O_CRDLY(tty)	_O_FLAG((tty),CRDLY)
 #define O_TABDLY(tty)	_O_FLAG((tty),TABDLY)
 #define O_BSDLY(tty)	_O_FLAG((tty),BSDLY)
 #define O_VTDLY(tty)	_O_FLAG((tty),VTDLY)
 #define O_FFDLY(tty)	_O_FLAG((tty),FFDLY)

 #define C_BAUD(tty)	_C_FLAG((tty),CBAUD)
 #define C_CSIZE(tty)	_C_FLAG((tty),CSIZE)
 #define C_CSTOPB(tty)	_C_FLAG((tty),CSTOPB)
 #define C_CREAD(tty)	_C_FLAG((tty),CREAD)
 #define C_PARENB(tty)	_C_FLAG((tty),PARENB)
 #define C_PARODD(tty)	_C_FLAG((tty),PARODD)
 #define C_HUPCL(tty)	_C_FLAG((tty),HUPCL)
 #define C_CLOCAL(tty)	_C_FLAG((tty),CLOCAL)
 #define C_CIBAUD(tty)	_C_FLAG((tty),CIBAUD)
 #define C_CRTSCTS(tty)	_C_FLAG((tty),CRTSCTS)

 #define L_ISIG(tty)	_L_FLAG((tty),ISIG)
 #define L_ICANON(tty)	_L_FLAG((tty),ICANON)
 #define L_XCASE(tty)	_L_FLAG((tty),XCASE)
 #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_NOFLSH(tty)	_L_FLAG((tty),NOFLSH)
 #define L_TOSTOP(tty)	_L_FLAG((tty),TOSTOP)
 #define L_ECHOCTL(tty)	_L_FLAG((tty),ECHOCTL)
 #define L_ECHOPRT(tty)	_L_FLAG((tty),ECHOPRT)
 #define L_ECHOKE(tty)	_L_FLAG((tty),ECHOKE)
 #define L_FLUSHO(tty)	_L_FLAG((tty),FLUSHO)
 #define L_PENDIN(tty)	_L_FLAG((tty),PENDIN)
 #define L_IEXTEN(tty)	_L_FLAG((tty),IEXTEN)

 struct device;
 /*
  * 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.
  * 						- TYT, 9/14/92
  */
 struct tty_struct {
 	int	magic;
 	struct tty_driver *driver;
 	int index;
 	struct tty_ldisc ldisc;
 	struct mutex termios_mutex;
 	struct ktermios *termios, *termios_locked;
 	char name[64];
 	int pgrp;
 	int session;
 	unsigned long flags;
 	int count;
 	struct winsize winsize;
 	unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 	unsigned char low_latency:1, warned:1;
 	unsigned char ctrl_status;
 	unsigned int receive_room;	/* Bytes free for queue */

 	struct tty_struct *link;
 	struct fasync_struct *fasync;
 	struct tty_bufhead buf;
 	int alt_speed;		/* For magic substitution of 38400 bps */
 	wait_queue_head_t write_wait;
 	wait_queue_head_t read_wait;
 	struct work_struct hangup_work;
 	void *disc_data;
 	void *driver_data;
 	struct list_head tty_files;

 #define N_TTY_BUF_SIZE 4096

 	/*
 	 * The following is data for the N_TTY line discipline.  For
 	 * historical reasons, this is included in the tty structure.
 	 */
 	unsigned int column;
 	unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 	unsigned char closing:1;
 	unsigned short minimum_to_wake;
 	unsigned long overrun_time;
 	int num_overrun;
 	unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 	char *read_buf;
 	int read_head;
 	int read_tail;
 	int read_cnt;
 	unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 	int canon_data;
 	unsigned long canon_head;
 	unsigned int canon_column;
 	struct mutex atomic_read_lock;
 	struct mutex atomic_write_lock;
 	unsigned char *write_buf;
 	int write_cnt;
 	spinlock_t read_lock;
 	/* If the tty has a pending do_SAK, queue it here - akpm */
 	struct work_struct SAK_work;
 };

 /* tty magic number */
 #define TTY_MAGIC		0x5401

 /*
  * 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 respect to itself, as must
  * tty->write.  Thus, you must use the inline functions set_bit() and
  * clear_bit() to make things atomic.
  */
 #define TTY_THROTTLED 		0	/* Call unthrottle() at threshold min */
 #define TTY_IO_ERROR 		1	/* Canse an I/O error (may be no ldisc too) */
 #define TTY_OTHER_CLOSED 	2	/* Other side (if any) has closed */
 #define TTY_EXCLUSIVE 		3	/* Exclusive open mode */
 #define TTY_DEBUG 		4	/* Debugging */
 #define TTY_DO_WRITE_WAKEUP 	5	/* Call write_wakeup after queuing new */
 #define TTY_PUSH 		6	/* n_tty private */
 #define TTY_CLOSING 		7	/* ->close() in progress */
 #define TTY_LDISC 		9	/* Line discipline attached */
 #define TTY_HW_COOK_OUT 	14	/* Hardware can do output cooking */
 #define TTY_HW_COOK_IN 		15	/* Hardware can do input cooking */
 #define TTY_PTY_LOCK 		16	/* pty private */
 #define TTY_NO_WRITE_SPLIT 	17	/* Preserve write boundaries to driver */
 #define TTY_HUPPED 		18	/* Post driver->hangup() */

 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))

 extern void tty_write_flush(struct tty_struct *);

 extern struct ktermios tty_std_termios;

 extern int kmsg_redirect;

 extern void console_init(void);
 extern int vcs_init(void);

 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 			      const char *routine);
 extern char *tty_name(struct tty_struct *tty, char *buf);
 extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
 extern int tty_check_change(struct tty_struct * tty);
 extern void stop_tty(struct tty_struct * tty);
 extern void start_tty(struct tty_struct * tty);
 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 extern int tty_unregister_ldisc(int disc);
 extern int tty_register_driver(struct tty_driver *driver);
 extern int tty_unregister_driver(struct tty_driver *driver);
 extern struct device *tty_register_device(struct tty_driver *driver,
 					  unsigned index, struct device *dev);
 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 			     int buflen);
 extern void tty_write_message(struct tty_struct *tty, char *msg);

 extern int is_orphaned_pgrp(int pgrp);
 extern int is_ignored(int sig);
 extern int tty_signal(int sig, struct tty_struct *tty);
 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);
 extern void __do_SAK(struct tty_struct *tty);
 extern void disassociate_ctty(int priv);
 extern void tty_flip_buffer_push(struct tty_struct *tty);
 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);

 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 extern void tty_ldisc_deref(struct tty_ldisc *);
 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);

 extern struct tty_ldisc *tty_ldisc_get(int);
 extern void tty_ldisc_put(int);

 extern void tty_wakeup(struct tty_struct *tty);
 extern void tty_ldisc_flush(struct tty_struct *tty);

 extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 		     unsigned long arg);

 extern dev_t tty_devnum(struct tty_struct *tty);
 extern void proc_clear_tty(struct task_struct *p);
 extern void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
 extern void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
 extern struct tty_struct *get_current_tty(void);

 extern struct mutex tty_mutex;

 /* n_tty.c */
 extern struct tty_ldisc tty_ldisc_N_TTY;

 /* tty_ioctl.c */
 extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 		       unsigned int cmd, unsigned long arg);

 /* serial.c */

 extern void serial_console_init(void);

 /* pcxx.c */

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

 /* printk.c */

 extern void console_print(const char *);

 /* vt.c */

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

 #endif /* __KERNEL__ */
 #endif
	#ifndef _LINUX_TTY_H
	#define _LINUX_TTY_H

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

	#ifdef __KERNEL__
	#include <linux/fs.h>
	#include <linux/major.h>
	#include <linux/termios.h>
	#include <linux/workqueue.h>
	#include <linux/tty_driver.h>
	#include <linux/tty_ldisc.h>
	#include <linux/mutex.h>

	#include <asm/system.h>


	/*
	* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
	* hardcoded at present.)
	*/
	#define NR_PTYS CONFIG_LEGACY_PTY_COUNT /* Number of legacy ptys */
	#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
	#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
	#define NR_LDISCS 16

	/*
	* 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 has no character etc)
	*/
	#define __DISABLED_CHAR '\0'

	/*
	* This is the flip buffer used for the tty driver. The buffer is
	* located in the tty structure, and is used as a high speed interface
	* between the tty driver and the tty line discipline.
	*/
	#define TTY_FLIPBUF_SIZE 512

	struct tty_buffer {
	struct tty_buffer *next;
	char *char_buf_ptr;
	unsigned char *flag_buf_ptr;
	int used;
	int size;
	int commit;
	int read;
	/* Data points here */
	unsigned long data[0];
	};

	struct tty_bufhead {
	struct delayed_work work;
	struct semaphore pty_sem;
	spinlock_t lock;
	struct tty_buffer head; / Queue head */
	struct tty_buffer tail; / Active buffer */
	struct tty_buffer free; / Free queue head */
	int memory_used; /* Buffer space used excluding free queue */
	};
	/*
	* The pty uses char_buf and flag_buf as a contiguous buffer
	*/
	#define PTY_BUF_SIZE 4*TTY_FLIPBUF_SIZE

	/*
	* When a break, frame error, or parity error happens, these codes are
	* stuffed into the flags buffer.
	*/
	#define TTY_NORMAL 0
	#define TTY_BREAK 1
	#define TTY_FRAME 2
	#define TTY_PARITY 3
	#define TTY_OVERRUN 4

	#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 TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
	#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
	#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
	#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
	#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
	#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
	#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
	#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
	#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
	#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
	#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
	#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])

	#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_FLAG(tty,f) ((tty)->termios->c_lflag & (f))

	#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_ISTRIP(tty) _I_FLAG((tty),ISTRIP)
	#define I_INLCR(tty) _I_FLAG((tty),INLCR)
	#define I_IGNCR(tty) _I_FLAG((tty),IGNCR)
	#define I_ICRNL(tty) _I_FLAG((tty),ICRNL)
	#define I_IUCLC(tty) _I_FLAG((tty),IUCLC)
	#define I_IXON(tty) _I_FLAG((tty),IXON)
	#define I_IXANY(tty) _I_FLAG((tty),IXANY)
	#define I_IXOFF(tty) _I_FLAG((tty),IXOFF)
	#define I_IMAXBEL(tty) _I_FLAG((tty),IMAXBEL)
	#define I_IUTF8(tty) _I_FLAG((tty),IUTF8)

	#define O_OPOST(tty) _O_FLAG((tty),OPOST)
	#define O_OLCUC(tty) _O_FLAG((tty),OLCUC)
	#define O_ONLCR(tty) _O_FLAG((tty),ONLCR)
	#define O_OCRNL(tty) _O_FLAG((tty),OCRNL)
	#define O_ONOCR(tty) _O_FLAG((tty),ONOCR)
	#define O_ONLRET(tty) _O_FLAG((tty),ONLRET)
	#define O_OFILL(tty) _O_FLAG((tty),OFILL)
	#define O_OFDEL(tty) _O_FLAG((tty),OFDEL)
	#define O_NLDLY(tty) _O_FLAG((tty),NLDLY)
	#define O_CRDLY(tty) _O_FLAG((tty),CRDLY)
	#define O_TABDLY(tty) _O_FLAG((tty),TABDLY)
	#define O_BSDLY(tty) _O_FLAG((tty),BSDLY)
	#define O_VTDLY(tty) _O_FLAG((tty),VTDLY)
	#define O_FFDLY(tty) _O_FLAG((tty),FFDLY)

	#define C_BAUD(tty) _C_FLAG((tty),CBAUD)
	#define C_CSIZE(tty) _C_FLAG((tty),CSIZE)
	#define C_CSTOPB(tty) _C_FLAG((tty),CSTOPB)
	#define C_CREAD(tty) _C_FLAG((tty),CREAD)
	#define C_PARENB(tty) _C_FLAG((tty),PARENB)
	#define C_PARODD(tty) _C_FLAG((tty),PARODD)
	#define C_HUPCL(tty) _C_FLAG((tty),HUPCL)
	#define C_CLOCAL(tty) _C_FLAG((tty),CLOCAL)
	#define C_CIBAUD(tty) _C_FLAG((tty),CIBAUD)
	#define C_CRTSCTS(tty) _C_FLAG((tty),CRTSCTS)

	#define L_ISIG(tty) _L_FLAG((tty),ISIG)
	#define L_ICANON(tty) _L_FLAG((tty),ICANON)
	#define L_XCASE(tty) _L_FLAG((tty),XCASE)
	#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_NOFLSH(tty) _L_FLAG((tty),NOFLSH)
	#define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP)
	#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
	#define L_ECHOPRT(tty) _L_FLAG((tty),ECHOPRT)
	#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
	#define L_FLUSHO(tty) _L_FLAG((tty),FLUSHO)
	#define L_PENDIN(tty) _L_FLAG((tty),PENDIN)
	#define L_IEXTEN(tty) _L_FLAG((tty),IEXTEN)

	struct device;
	/*
	* 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.
	* - TYT, 9/14/92
	*/
	struct tty_struct {
	int magic;
	struct tty_driver *driver;
	int index;
	struct tty_ldisc ldisc;
	struct mutex termios_mutex;
	struct ktermios termios, termios_locked;
	char name[64];
	int pgrp;
	int session;
	unsigned long flags;
	int count;
	struct winsize winsize;
	unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
	unsigned char low_latency:1, warned:1;
	unsigned char ctrl_status;
	unsigned int receive_room; /* Bytes free for queue */

	struct tty_struct *link;
	struct fasync_struct *fasync;
	struct tty_bufhead buf;
	int alt_speed; /* For magic substitution of 38400 bps */
	wait_queue_head_t write_wait;
	wait_queue_head_t read_wait;
	struct work_struct hangup_work;
	void *disc_data;
	void *driver_data;
	struct list_head tty_files;

	#define N_TTY_BUF_SIZE 4096

	/*
	* The following is data for the N_TTY line discipline. For
	* historical reasons, this is included in the tty structure.
	*/
	unsigned int column;
	unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
	unsigned char closing:1;
	unsigned short minimum_to_wake;
	unsigned long overrun_time;
	int num_overrun;
	unsigned long process_char_map[256/(8*sizeof(unsigned long))];
	char *read_buf;
	int read_head;
	int read_tail;
	int read_cnt;
	unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
	int canon_data;
	unsigned long canon_head;
	unsigned int canon_column;
	struct mutex atomic_read_lock;
	struct mutex atomic_write_lock;
	unsigned char *write_buf;
	int write_cnt;
	spinlock_t read_lock;
	/* If the tty has a pending do_SAK, queue it here - akpm */
	struct work_struct SAK_work;
	};

	/* tty magic number */
	#define TTY_MAGIC 0x5401

	/*
	* 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 respect to itself, as must
	* tty->write. Thus, you must use the inline functions set_bit() and
	* clear_bit() to make things atomic.
	*/
	#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
	#define TTY_IO_ERROR 1 /* Canse an I/O error (may be no ldisc too) */
	#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
	#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
	#define TTY_DEBUG 4 /* Debugging */
	#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
	#define TTY_PUSH 6 /* n_tty private */
	#define TTY_CLOSING 7 /* ->close() in progress */
	#define TTY_LDISC 9 /* Line discipline attached */
	#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
	#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
	#define TTY_PTY_LOCK 16 /* pty private */
	#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
	#define TTY_HUPPED 18 /* Post driver->hangup() */

	#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))

	extern void tty_write_flush(struct tty_struct *);

	extern struct ktermios tty_std_termios;

	extern int kmsg_redirect;

	extern void console_init(void);
	extern int vcs_init(void);

	extern int tty_paranoia_check(struct tty_struct tty, struct inode inode,
	const char *routine);
	extern char tty_name(struct tty_struct tty, char *buf);
	extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
	extern int tty_check_change(struct tty_struct * tty);
	extern void stop_tty(struct tty_struct * tty);
	extern void start_tty(struct tty_struct * tty);
	extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
	extern int tty_unregister_ldisc(int disc);
	extern int tty_register_driver(struct tty_driver *driver);
	extern int tty_unregister_driver(struct tty_driver *driver);
	extern struct device tty_register_device(struct tty_driver driver,
	unsigned index, struct device *dev);
	extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
	extern int tty_read_raw_data(struct tty_struct tty, unsigned char bufp,
	int buflen);
	extern void tty_write_message(struct tty_struct tty, char msg);

	extern int is_orphaned_pgrp(int pgrp);
	extern int is_ignored(int sig);
	extern int tty_signal(int sig, struct tty_struct *tty);
	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);
	extern void __do_SAK(struct tty_struct *tty);
	extern void disassociate_ctty(int priv);
	extern void tty_flip_buffer_push(struct tty_struct *tty);
	extern speed_t tty_get_baud_rate(struct tty_struct *tty);
	extern speed_t tty_termios_baud_rate(struct ktermios *termios);
	extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);

	extern struct tty_ldisc tty_ldisc_ref(struct tty_struct );
	extern void tty_ldisc_deref(struct tty_ldisc *);
	extern struct tty_ldisc tty_ldisc_ref_wait(struct tty_struct );

	extern struct tty_ldisc *tty_ldisc_get(int);
	extern void tty_ldisc_put(int);

	extern void tty_wakeup(struct tty_struct *tty);
	extern void tty_ldisc_flush(struct tty_struct *tty);

	extern int tty_ioctl(struct inode inode, struct file file, unsigned int cmd,
	unsigned long arg);

	extern dev_t tty_devnum(struct tty_struct *tty);
	extern void proc_clear_tty(struct task_struct *p);
	extern void __proc_set_tty(struct task_struct tsk, struct tty_struct tty);
	extern void proc_set_tty(struct task_struct tsk, struct tty_struct tty);
	extern struct tty_struct *get_current_tty(void);

	extern struct mutex tty_mutex;

	/* n_tty.c */
	extern struct tty_ldisc tty_ldisc_N_TTY;

	/* tty_ioctl.c */
	extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
	unsigned int cmd, unsigned long arg);

	/* serial.c */

	extern void serial_console_init(void);

	/* pcxx.c */

	extern int pcxe_open(struct tty_struct tty, struct file filp);

	/* printk.c */

	extern void console_print(const char *);

	/* vt.c */

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

	#endif /* __KERNEL__ */
	#endif