tty_add_file      861 drivers/tty/pty.c 	tty_add_file(tty, filp);
tty_add_file     2043 drivers/tty/tty_io.c 	tty_add_file(tty, filp);
tty_add_file      562 include/linux/tty.h extern void tty_add_file(struct tty_struct *tty, struct file *file);