tag	line	file	source code
IEXTEN	1778	drivers/char/tty_io.c	ECHOCTL | ECHOKE | IEXTEN;
IEXTEN	1784	drivers/char/tty_io.c	ECHOCTL | ECHOKE | IEXTEN;
IEXTEN	226	include/linux/tty.h	#define L_IEXTEN(tty)  _L_FLAG((tty),IEXTEN)