BRKINT            105 include/linux/tty.h #define I_BRKINT(tty)	_I_FLAG((tty), BRKINT)
BRKINT             26 include/linux/usb/serial.h #define RELEVANT_IFLAG(iflag)	(iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))