[net-next-2.6.git] / include / linux / tty.h

#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_UNIX98_PTY_DEFAULT	4096      /* Default maximum for Unix98 ptys */
#define NR_UNIX98_PTY_MAX	(1 << MINORBITS) /* Absolute limit */
#define NR_LDISCS		18

/* line disciplines */
#define N_TTY		0
#define N_SLIP		1
#define N_MOUSE		2
#define N_PPP		3
#define N_STRIP		4
#define N_AX25		5
#define N_X25		6	/* X.25 async */
#define N_6PACK		7
#define N_MASC		8	/* Reserved for Mobitex module <kaz@cafe.net> */
#define N_R3964		9	/* Reserved for Simatic R3964 module */
#define N_PROFIBUS_FDL	10	/* Reserved for Profibus */
#define N_IRDA		11	/* Linux IrDa - http://irda.sourceforge.net/ */
#define N_SMSBLOCK	12	/* SMS block mode - for talking to GSM data */
				/* cards about SMS messages */
#define N_HDLC		13	/* synchronous HDLC */
#define N_SYNC_PPP	14	/* synchronous PPP */
#define N_HCI		15	/* Bluetooth HCI UART */
#define N_GIGASET_M101	16	/* Siemens Gigaset M101 serial DECT adapter */
#define N_SLCAN		17	/* Serial / USB serial CAN Adaptors */

/*
 * 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'

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;
	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 */
};
/*
 * 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;
struct signal_struct;

/*
 * Port level information. Each device keeps its own port level information
 * so provide a common structure for those ports wanting to use common support
 * routines.
 *
 * The tty port has a different lifetime to the tty so must be kept apart.
 * In addition be careful as tty -> port mappings are valid for the life
 * of the tty object but in many cases port -> tty mappings are valid only
 * until a hangup so don't use the wrong path.
 */
 
struct tty_port {
	struct tty_struct	*tty;		/* Back pointer */
	int			blocked_open;	/* Waiting to open */
	int			count;		/* Usage count */
	wait_queue_head_t	open_wait;	/* Open waiters */
	wait_queue_head_t	close_wait;	/* Close waiters */
	unsigned long		flags;		/* TTY flags ASY_*/
	struct mutex		mutex;		/* Locking */
	unsigned char		*xmit_buf;	/* Optional buffer */
};

/*
 * 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_operations;

struct tty_struct {
	int	magic;
	struct tty_driver *driver;
	const struct tty_operations *ops;
	int index;
	/* The ldisc objects are protected by tty_ldisc_lock at the moment */
	struct tty_ldisc ldisc;
	struct mutex termios_mutex;
	spinlock_t ctrl_lock;
	/* Termios values are protected by the termios mutex */
	struct ktermios *termios, *termios_locked;
	char name[64];
	struct pid *pgrp;		/* Protected by ctrl lock */
	struct pid *session;
	unsigned long flags;
	int count;
	struct winsize winsize;		/* termios mutex */
	unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
	unsigned char low_latency:1, warned:1;
	unsigned char ctrl_status;	/* ctrl_lock */
	unsigned int receive_room;	/* Bytes free for queue */

	struct tty_struct *link;
	struct fasync_struct *fasync;
	struct tty_bufhead buf;		/* Locked internally */
	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.
	 * Mostly locked by the BKL.
	 */
	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;
	struct tty_port *port;
};

/* 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_FLUSHING		19	/* Flushing to ldisc in progress */
#define TTY_FLUSHPENDING	20	/* Queued buffer flush pending */

#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_ops *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 tty_put_char(struct tty_struct *tty, unsigned char c);
extern int tty_chars_in_buffer(struct tty_struct *tty);
extern int tty_write_room(struct tty_struct *tty);
extern void tty_driver_flush_buffer(struct tty_struct *tty);
extern void tty_throttle(struct tty_struct *tty);
extern void tty_unthrottle(struct tty_struct *tty);

extern int is_current_pgrp_orphaned(void);
extern struct pid *tty_get_pgrp(struct tty_struct *tty);
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 no_tty(void);
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 void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud);
extern void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud);
extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);

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 const struct file_operations tty_ldiscs_proc_fops;

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

extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
			unsigned int cmd, unsigned long arg);
extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
extern dev_t tty_devnum(struct tty_struct *tty);
extern void proc_clear_tty(struct task_struct *p);
extern struct tty_struct *get_current_tty(void);

extern struct mutex tty_mutex;

extern void tty_write_unlock(struct tty_struct *tty);
extern int tty_write_lock(struct tty_struct *tty, int ndelay);
#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))

extern void tty_port_init(struct tty_port *port);
extern int tty_port_alloc_xmit_buf(struct tty_port *port);
extern void tty_port_free_xmit_buf(struct tty_port *port);


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

/* tty_audit.c */
#ifdef CONFIG_AUDIT
extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
			       size_t size);
extern void tty_audit_exit(void);
extern void tty_audit_fork(struct signal_struct *sig);
extern void tty_audit_push(struct tty_struct *tty);
extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid);
#else
static inline void tty_audit_add_data(struct tty_struct *tty,
				      unsigned char *data, size_t size)
{
}
static inline void tty_audit_exit(void)
{
}
static inline void tty_audit_fork(struct signal_struct *sig)
{
}
static inline void tty_audit_push(struct tty_struct *tty)
{
}
static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid)
{
}
#endif

/* 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
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_TTY_H
	2	#define _LINUX_TTY_H
	3
	4	/*
	5	* 'tty.h' defines some structures used by tty_io.c and some defines.
	6	*/
	7
1da177e4	8	#ifdef __KERNEL__
1da177e4 LT	9	#include <linux/fs.h>
	10	#include <linux/major.h>
	11	#include <linux/termios.h>
	12	#include <linux/workqueue.h>
	13	#include <linux/tty_driver.h>
	14	#include <linux/tty_ldisc.h>
70522e12	15	#include <linux/mutex.h>
1da177e4 LT	16
	17	#include <asm/system.h>
	18
	19
	20	/*
	21	* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
	22	* hardcoded at present.)
	23	*/
1da177e4 LT	24	#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
1da177e4 LT	25	#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
cd05acfe	26	#define NR_LDISCS 18
4564f9e5 TS	27
	28	/* line disciplines */
	29	#define N_TTY 0
	30	#define N_SLIP 1
	31	#define N_MOUSE 2
	32	#define N_PPP 3
	33	#define N_STRIP 4
	34	#define N_AX25 5
	35	#define N_X25 6 /* X.25 async */
	36	#define N_6PACK 7
	37	#define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
	38	#define N_R3964 9 /* Reserved for Simatic R3964 module */
44d1b980	39	#define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
4564f9e5 TS	40	#define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
	41	#define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
	42	/* cards about SMS messages */
	43	#define N_HDLC 13 /* synchronous HDLC */
	44	#define N_SYNC_PPP 14 /* synchronous PPP */
	45	#define N_HCI 15 /* Bluetooth HCI UART */
	46	#define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
cd05acfe	47	#define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
1da177e4	48
1da177e4 LT	49	/*
	50	* This character is the same as _POSIX_VDISABLE: it cannot be used as
	51	* a c_cc[] character, but indicates that a particular special character
	52	* isn't in use (eg VINTR has no character etc)
	53	*/
	54	#define __DISABLED_CHAR '\0'
	55
33f0f88f AC	56	struct tty_buffer {
	57	struct tty_buffer *next;
	58	char *char_buf_ptr;
	59	unsigned char *flag_buf_ptr;
	60	int used;
	61	int size;
8977d929 PF	62	int commit;
8977d929 PF	63	int read;
33f0f88f AC	64	/* Data points here */
	65	unsigned long data[0];
	66	};
	67
	68	struct tty_bufhead {
52bad64d	69	struct delayed_work work;
808249ce	70	spinlock_t lock;
33f0f88f AC	71	struct tty_buffer head; / Queue head */
	72	struct tty_buffer tail; / Active buffer */
	73	struct tty_buffer free; / Free queue head */
01da5fd8	74	int memory_used; /* Buffer space used excluding free queue */
1da177e4	75	};
1da177e4 LT	76	/*
	77	* When a break, frame error, or parity error happens, these codes are
	78	* stuffed into the flags buffer.
	79	*/
	80	#define TTY_NORMAL 0
	81	#define TTY_BREAK 1
	82	#define TTY_FRAME 2
	83	#define TTY_PARITY 3
	84	#define TTY_OVERRUN 4
	85
	86	#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
	87	#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
	88	#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
	89	#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
	90	#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
	91	#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
	92	#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
	93	#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
	94	#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
	95	#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
	96	#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
	97	#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
	98	#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
	99	#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
	100	#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
	101	#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
	102	#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
	103
	104	#define _I_FLAG(tty,f) ((tty)->termios->c_iflag & (f))
	105	#define _O_FLAG(tty,f) ((tty)->termios->c_oflag & (f))
	106	#define _C_FLAG(tty,f) ((tty)->termios->c_cflag & (f))
	107	#define _L_FLAG(tty,f) ((tty)->termios->c_lflag & (f))
	108
	109	#define I_IGNBRK(tty) _I_FLAG((tty),IGNBRK)
	110	#define I_BRKINT(tty) _I_FLAG((tty),BRKINT)
	111	#define I_IGNPAR(tty) _I_FLAG((tty),IGNPAR)
	112	#define I_PARMRK(tty) _I_FLAG((tty),PARMRK)
	113	#define I_INPCK(tty) _I_FLAG((tty),INPCK)
	114	#define I_ISTRIP(tty) _I_FLAG((tty),ISTRIP)
	115	#define I_INLCR(tty) _I_FLAG((tty),INLCR)
	116	#define I_IGNCR(tty) _I_FLAG((tty),IGNCR)
	117	#define I_ICRNL(tty) _I_FLAG((tty),ICRNL)
	118	#define I_IUCLC(tty) _I_FLAG((tty),IUCLC)
	119	#define I_IXON(tty) _I_FLAG((tty),IXON)
	120	#define I_IXANY(tty) _I_FLAG((tty),IXANY)
	121	#define I_IXOFF(tty) _I_FLAG((tty),IXOFF)
	122	#define I_IMAXBEL(tty) _I_FLAG((tty),IMAXBEL)
	123	#define I_IUTF8(tty) _I_FLAG((tty),IUTF8)
	124
	125	#define O_OPOST(tty) _O_FLAG((tty),OPOST)
	126	#define O_OLCUC(tty) _O_FLAG((tty),OLCUC)
	127	#define O_ONLCR(tty) _O_FLAG((tty),ONLCR)
	128	#define O_OCRNL(tty) _O_FLAG((tty),OCRNL)
	129	#define O_ONOCR(tty) _O_FLAG((tty),ONOCR)
	130	#define O_ONLRET(tty) _O_FLAG((tty),ONLRET)
	131	#define O_OFILL(tty) _O_FLAG((tty),OFILL)
	132	#define O_OFDEL(tty) _O_FLAG((tty),OFDEL)
	133	#define O_NLDLY(tty) _O_FLAG((tty),NLDLY)
	134	#define O_CRDLY(tty) _O_FLAG((tty),CRDLY)
	135	#define O_TABDLY(tty) _O_FLAG((tty),TABDLY)
	136	#define O_BSDLY(tty) _O_FLAG((tty),BSDLY)
	137	#define O_VTDLY(tty) _O_FLAG((tty),VTDLY)
	138	#define O_FFDLY(tty) _O_FLAG((tty),FFDLY)
	139
140	#define C_BAUD(tty) _C_FLAG((tty),CBAUD)
141	#define C_CSIZE(tty) _C_FLAG((tty),CSIZE)
142	#define C_CSTOPB(tty) _C_FLAG((tty),CSTOPB)
143	#define C_CREAD(tty) _C_FLAG((tty),CREAD)
144	#define C_PARENB(tty) _C_FLAG((tty),PARENB)
145	#define C_PARODD(tty) _C_FLAG((tty),PARODD)
146	#define C_HUPCL(tty) _C_FLAG((tty),HUPCL)
147	#define C_CLOCAL(tty) _C_FLAG((tty),CLOCAL)
148	#define C_CIBAUD(tty) _C_FLAG((tty),CIBAUD)
149	#define C_CRTSCTS(tty) _C_FLAG((tty),CRTSCTS)
150
151	#define L_ISIG(tty) _L_FLAG((tty),ISIG)
152	#define L_ICANON(tty) _L_FLAG((tty),ICANON)
153	#define L_XCASE(tty) _L_FLAG((tty),XCASE)
154	#define L_ECHO(tty) _L_FLAG((tty),ECHO)
155	#define L_ECHOE(tty) _L_FLAG((tty),ECHOE)
156	#define L_ECHOK(tty) _L_FLAG((tty),ECHOK)
157	#define L_ECHONL(tty) _L_FLAG((tty),ECHONL)
158	#define L_NOFLSH(tty) _L_FLAG((tty),NOFLSH)
159	#define L_TOSTOP(tty) _L_FLAG((tty),TOSTOP)
160	#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
161	#define L_ECHOPRT(tty) _L_FLAG((tty),ECHOPRT)
162	#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
163	#define L_FLUSHO(tty) _L_FLAG((tty),FLUSHO)
164	#define L_PENDIN(tty) _L_FLAG((tty),PENDIN)
165	#define L_IEXTEN(tty) _L_FLAG((tty),IEXTEN)
166
167	struct device;
522ed776	168	struct signal_struct;
6f67048c AC	169
	170	/*
	171	* Port level information. Each device keeps its own port level information
	172	* so provide a common structure for those ports wanting to use common support
	173	* routines.
	174	*
	175	* The tty port has a different lifetime to the tty so must be kept apart.
	176	* In addition be careful as tty -> port mappings are valid for the life
	177	* of the tty object but in many cases port -> tty mappings are valid only
	178	* until a hangup so don't use the wrong path.
	179	*/
	180
	181	struct tty_port {
	182	struct tty_struct tty; / Back pointer */
	183	int blocked_open; /* Waiting to open */
	184	int count; /* Usage count */
	185	wait_queue_head_t open_wait; /* Open waiters */
	186	wait_queue_head_t close_wait; /* Close waiters */
	187	unsigned long flags; /* TTY flags ASY_*/
	188	struct mutex mutex; /* Locking */
	189	unsigned char xmit_buf; / Optional buffer */
	190	};
	191
1da177e4 LT	192	/*
	193	* Where all of the state associated with a tty is kept while the tty
	194	* is open. Since the termios state should be kept even if the tty
	195	* has been closed --- for things like the baud rate, etc --- it is
	196	* not stored here, but rather a pointer to the real state is stored
	197	* here. Possible the winsize structure should have the same
	198	* treatment, but (1) the default 80x24 is usually right and (2) it's
	199	* most often used by a windowing system, which will set the correct
	200	* size each time the window is created or resized anyway.
	201	* - TYT, 9/14/92
	202	*/
f34d7a5b AC	203
	204	struct tty_operations;
	205
1da177e4 LT	206	struct tty_struct {
	207	int magic;
	208	struct tty_driver *driver;
f34d7a5b	209	const struct tty_operations *ops;
1da177e4	210	int index;
a352def2	211	/* The ldisc objects are protected by tty_ldisc_lock at the moment */
1da177e4	212	struct tty_ldisc ldisc;
5785c95b	213	struct mutex termios_mutex;
04f378b1	214	spinlock_t ctrl_lock;
47f86834	215	/* Termios values are protected by the termios mutex */
edc6afc5	216	struct ktermios termios, termios_locked;
1da177e4	217	char name[64];
47f86834	218	struct pid pgrp; / Protected by ctrl lock */
ab521dc0	219	struct pid *session;
1da177e4 LT	220	unsigned long flags;
1da177e4 LT	221	int count;
47f86834	222	struct winsize winsize; /* termios mutex */
1da177e4 LT	223	unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
1da177e4 LT	224	unsigned char low_latency:1, warned:1;
47f86834	225	unsigned char ctrl_status; /* ctrl_lock */
33f0f88f	226	unsigned int receive_room; /* Bytes free for queue */
1da177e4 LT	227
	228	struct tty_struct *link;
	229	struct fasync_struct *fasync;
47f86834	230	struct tty_bufhead buf; /* Locked internally */
1da177e4 LT	231	int alt_speed; /* For magic substitution of 38400 bps */
	232	wait_queue_head_t write_wait;
	233	wait_queue_head_t read_wait;
	234	struct work_struct hangup_work;
	235	void *disc_data;
	236	void *driver_data;
	237	struct list_head tty_files;
	238
	239	#define N_TTY_BUF_SIZE 4096
6f67048c	240
1da177e4 LT	241	/*
	242	* The following is data for the N_TTY line discipline. For
	243	* historical reasons, this is included in the tty structure.
47f86834	244	* Mostly locked by the BKL.
1da177e4 LT	245	*/
	246	unsigned int column;
	247	unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
	248	unsigned char closing:1;
	249	unsigned short minimum_to_wake;
	250	unsigned long overrun_time;
	251	int num_overrun;
	252	unsigned long process_char_map[256/(8*sizeof(unsigned long))];
	253	char *read_buf;
	254	int read_head;
	255	int read_tail;
	256	int read_cnt;
	257	unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
	258	int canon_data;
	259	unsigned long canon_head;
	260	unsigned int canon_column;
70522e12 IM	261	struct mutex atomic_read_lock;
70522e12 IM	262	struct mutex atomic_write_lock;
1da177e4 LT	263	unsigned char *write_buf;
	264	int write_cnt;
	265	spinlock_t read_lock;
	266	/* If the tty has a pending do_SAK, queue it here - akpm */
	267	struct work_struct SAK_work;
6f67048c	268	struct tty_port *port;
1da177e4 LT	269	};
	270
	271	/* tty magic number */
	272	#define TTY_MAGIC 0x5401
	273
	274	/*
	275	* These bits are used in the flags field of the tty structure.
	276	*
	277	* So that interrupts won't be able to mess up the queues,
	278	* copy_to_cooked must be atomic with respect to itself, as must
	279	* tty->write. Thus, you must use the inline functions set_bit() and
	280	* clear_bit() to make things atomic.
	281	*/
	282	#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
	283	#define TTY_IO_ERROR 1 /* Canse an I/O error (may be no ldisc too) */
	284	#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
	285	#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
	286	#define TTY_DEBUG 4 /* Debugging */
	287	#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
	288	#define TTY_PUSH 6 /* n_tty private */
	289	#define TTY_CLOSING 7 /* ->close() in progress */
1da177e4 LT	290	#define TTY_LDISC 9 /* Line discipline attached */
	291	#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
	292	#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
	293	#define TTY_PTY_LOCK 16 /* pty private */
	294	#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
	295	#define TTY_HUPPED 18 /* Post driver->hangup() */
42fd552e AC	296	#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
42fd552e AC	297	#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
1da177e4 LT	298
	299	#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
	300
	301	extern void tty_write_flush(struct tty_struct *);
	302
edc6afc5	303	extern struct ktermios tty_std_termios;
1da177e4 LT	304
	305	extern int kmsg_redirect;
	306
	307	extern void console_init(void);
	308	extern int vcs_init(void);
	309
	310	extern int tty_paranoia_check(struct tty_struct tty, struct inode inode,
	311	const char *routine);
	312	extern char tty_name(struct tty_struct tty, char *buf);
	313	extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
	314	extern int tty_check_change(struct tty_struct * tty);
	315	extern void stop_tty(struct tty_struct * tty);
	316	extern void start_tty(struct tty_struct * tty);
a352def2	317	extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
bfb07599	318	extern int tty_unregister_ldisc(int disc);
1da177e4 LT	319	extern int tty_register_driver(struct tty_driver *driver);
1da177e4 LT	320	extern int tty_unregister_driver(struct tty_driver *driver);
01107d34 GKH	321	extern struct device tty_register_device(struct tty_driver driver,
01107d34 GKH	322	unsigned index, struct device *dev);
1da177e4 LT	323	extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
	324	extern int tty_read_raw_data(struct tty_struct tty, unsigned char bufp,
	325	int buflen);
	326	extern void tty_write_message(struct tty_struct tty, char msg);
f34d7a5b AC	327	extern int tty_put_char(struct tty_struct *tty, unsigned char c);
	328	extern int tty_chars_in_buffer(struct tty_struct *tty);
	329	extern int tty_write_room(struct tty_struct *tty);
	330	extern void tty_driver_flush_buffer(struct tty_struct *tty);
39c2e60f AC	331	extern void tty_throttle(struct tty_struct *tty);
39c2e60f AC	332	extern void tty_unthrottle(struct tty_struct *tty);
1da177e4	333
3e7cd6c4	334	extern int is_current_pgrp_orphaned(void);
5d0fdf1e	335	extern struct pid tty_get_pgrp(struct tty_struct tty);
1da177e4 LT	336	extern int is_ignored(int sig);
	337	extern int tty_signal(int sig, struct tty_struct *tty);
	338	extern void tty_hangup(struct tty_struct * tty);
	339	extern void tty_vhangup(struct tty_struct * tty);
	340	extern void tty_unhangup(struct file *filp);
	341	extern int tty_hung_up_p(struct file * filp);
	342	extern void do_SAK(struct tty_struct *tty);
8b6312f4	343	extern void __do_SAK(struct tty_struct *tty);
1da177e4	344	extern void disassociate_ctty(int priv);
98a27ba4	345	extern void no_tty(void);
1da177e4	346	extern void tty_flip_buffer_push(struct tty_struct *tty);
edc6afc5 AC	347	extern speed_t tty_get_baud_rate(struct tty_struct *tty);
	348	extern speed_t tty_termios_baud_rate(struct ktermios *termios);
	349	extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
5f519d72 AC	350	extern void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud);
	351	extern void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud);
	352	extern void tty_termios_copy_hw(struct ktermios new, struct ktermios old);
bf5e5834	353	extern int tty_termios_hw_change(struct ktermios a, struct ktermios b);
1da177e4 LT	354
	355	extern struct tty_ldisc tty_ldisc_ref(struct tty_struct );
	356	extern void tty_ldisc_deref(struct tty_ldisc *);
	357	extern struct tty_ldisc tty_ldisc_ref_wait(struct tty_struct );
a352def2	358	extern const struct file_operations tty_ldiscs_proc_fops;
1da177e4 LT	359
	360	extern void tty_wakeup(struct tty_struct *tty);
	361	extern void tty_ldisc_flush(struct tty_struct *tty);
	362
04f378b1	363	extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
0fc00e24 AC	364	extern int tty_mode_ioctl(struct tty_struct tty, struct file file,
	365	unsigned int cmd, unsigned long arg);
	366	extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
24ec839c PZ	367	extern dev_t tty_devnum(struct tty_struct *tty);
24ec839c PZ	368	extern void proc_clear_tty(struct task_struct *p);
24ec839c PZ	369	extern struct tty_struct *get_current_tty(void);
24ec839c PZ	370
70522e12	371	extern struct mutex tty_mutex;
1da177e4	372
9c1729db AC	373	extern void tty_write_unlock(struct tty_struct *tty);
	374	extern int tty_write_lock(struct tty_struct *tty, int ndelay);
	375	#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
	376
6f67048c AC	377	extern void tty_port_init(struct tty_port *port);
	378	extern int tty_port_alloc_xmit_buf(struct tty_port *port);
	379	extern void tty_port_free_xmit_buf(struct tty_port *port);
	380
9c1729db AC	381
9c1729db AC	382
1da177e4	383	/* n_tty.c */
a352def2	384	extern struct tty_ldisc_ops tty_ldisc_N_TTY;
1da177e4	385
522ed776 MT	386	/* tty_audit.c */
	387	#ifdef CONFIG_AUDIT
	388	extern void tty_audit_add_data(struct tty_struct tty, unsigned char data,
	389	size_t size);
	390	extern void tty_audit_exit(void);
	391	extern void tty_audit_fork(struct signal_struct *sig);
	392	extern void tty_audit_push(struct tty_struct *tty);
2532386f	393	extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid);
522ed776 MT	394	#else
	395	static inline void tty_audit_add_data(struct tty_struct *tty,
	396	unsigned char *data, size_t size)
	397	{
	398	}
	399	static inline void tty_audit_exit(void)
	400	{
	401	}
	402	static inline void tty_audit_fork(struct signal_struct *sig)
	403	{
	404	}
	405	static inline void tty_audit_push(struct tty_struct *tty)
	406	{
	407	}
2532386f	408	static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid)
522ed776 MT	409	{
522ed776 MT	410	}
522ed776 MT	411	#endif
522ed776 MT	412
1da177e4 LT	413	/* tty_ioctl.c */
	414	extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
	415	unsigned int cmd, unsigned long arg);
	416
	417	/* serial.c */
	418
	419	extern void serial_console_init(void);
	420
	421	/* pcxx.c */
	422
	423	extern int pcxe_open(struct tty_struct tty, struct file filp);
	424
	425	/* printk.c */
	426
	427	extern void console_print(const char *);
	428
	429	/* vt.c */
	430
	431	extern int vt_ioctl(struct tty_struct tty, struct file file,
	432	unsigned int cmd, unsigned long arg);
	433
1da177e4 LT	434	#endif /* __KERNEL__ */
1da177e4 LT	435	#endif