53 	struct sigaction sa;  in sethandler()  local
54 	memset(&sa, 0, sizeof(sa));  in sethandler()
55 	sa.sa_sigaction = handler;  in sethandler()
56 	sa.sa_flags = SA_SIGINFO | flags;  in sethandler()
57 	sigemptyset(&sa.sa_mask);  in sethandler()
58 	if (sigaction(sig, &sa, 0))  in sethandler()
64 	struct sigaction sa;  in clearhandler()  local
65 	memset(&sa, 0, sizeof(sa));  in clearhandler()
66 	sa.sa_handler = SIG_DFL;  in clearhandler()
67 	sigemptyset(&sa.sa_mask);  in clearhandler()
68 	if (sigaction(sig, &sa, 0))  in clearhandler()