tag	line	file	source code
hangup	2299	drivers/char/serial.c	serial_driver.hangup = rs_hangup;
hangup	365	drivers/char/tty_io.c	if (tty->driver.hangup)
hangup	366	drivers/char/tty_io.c	(tty->driver.hangup)(tty);
hangup	139	include/linux/tty_driver.h	void (*hangup)(struct tty_struct *tty);