TTY之struct tty

struct tty_ldisc {  struct tty_ldisc_ops *ops;  struct tty_struct *tty; };

struct tty_ldisc_ops {  int magic;  char *name;  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);  ssize_t (*read)(struct tty_struct *tty, struct file *file,    unsigned char __user *buf, size_t nr);  ssize_t (*write)(struct tty_struct *tty, struct file *file,     const unsigned char *buf, size_t nr);  int (*ioctl)(struct tty_struct *tty, struct file *file,     unsigned int cmd, unsigned long arg);  long (*compat_ioctl)(struct tty_struct *tty, struct file *file,     unsigned int cmd, unsigned long arg);  void (*set_termios)(struct tty_struct *tty, struct ktermios *old);  unsigned int (*poll)(struct tty_struct *, struct file *,         struct poll_table_struct *);  int (*hangup)(struct tty_struct *tty);

 /*   * The following routines are called from below.   */  void (*receive_buf)(struct tty_struct *, const unsigned char *cp,           char *fp, int count);  void (*write_wakeup)(struct tty_struct *);  void (*dcd_change)(struct tty_struct *, unsigned int);  int (*receive_buf2)(struct tty_struct *, const unsigned char *cp,     char *fp, int count);

 struct  module *owner;

 int refcount; };