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#ifndef _LINUX_TTY_LDISC_H

#define _LINUX_TTY_LDISC_H

/*

 * Definitions for the tty line discipline

 */

#include <linux/fs.h>

#include <linux/wait.h>

struct tty_ldisc {

        int     magic;

        int     num;

        int     flags;

        /*

         * The following routines are called from above.

         */

        int     (*open)(struct tty_struct *);

        void    (*close)(struct tty_struct *);

        void    (*flush_buffer)(struct tty_struct *tty);

        int     (*chars_in_buffer)(struct tty_struct *tty);

        int     (*read)(struct tty_struct * tty, struct file * file,

                        unsigned char * buf, unsigned int nr);

        int     (*write)(struct tty_struct * tty, struct file * file,

                         const unsigned char * buf, unsigned int nr);

        int     (*ioctl)(struct tty_struct * tty, struct file * file,

                         unsigned int cmd, unsigned long arg);

        void    (*set_termios)(struct tty_struct *tty, struct termios * old);

        int     (*select)(struct tty_struct * tty, struct inode * inode,

                          struct file * file, int sel_type,

                          struct select_table_struct *wait);

        /*

         * The following routines are called from below.

         */

        void    (*receive_buf)(struct tty_struct *, const unsigned char *cp,

                               char *fp, int count);

        int     (*receive_room)(struct tty_struct *);

        void    (*write_wakeup)(struct tty_struct *);

};

#define TTY_LDISC_MAGIC 0x5403

#define LDISC_FLAG_DEFINED      0x00000001

#endif /* _LINUX_TTY_LDISC_H */