TCSBRK           2555 drivers/tty/tty_io.c 	case TCSBRK:
TCSBRK           2616 drivers/tty/tty_io.c 	case TCSBRK:   /* SVID version: non-zero arg --> no break */
TCSBRK           2822 drivers/tty/tty_io.c 	case TCSBRK: