extern void tty_release_struct(struct tty_struct *tty, int idx);
extern int tty_release(struct inode *inode, struct file *filp);
extern void tty_init_termios(struct tty_struct *tty);
+extern void tty_save_termios(struct tty_struct *tty);
extern int tty_standard_install(struct tty_driver *driver,
struct tty_struct *tty);