Class sigaction

internal/crashhandler/handler.c:102–102

	// Restore the default disposition and re-raise so the process dies with
	// the original signal (and dumps core where enabled) instead of wedging.
	struct sigaction dfl;
	memset(&dfl, 0, sizeof(dfl));
	dfl.sa_handler = SIG_DFL;
	sigemptyset(&dfl.sa_mask);