SIG_DFL            66 include/linux/init_task.h 	.action		= { { { .sa_handler = SIG_DFL, } }, },		\
SIG_DFL           420 include/linux/signal.h 	(((t)->sighand->action[(signr)-1].sa.sa_handler != SIG_DFL) &&	\
SIG_DFL           425 include/linux/signal.h 	 (t)->sighand->action[(signr)-1].sa.sa_handler == SIG_DFL)