45 	struct sigaction sa;  in sethandler()  local
46 	memset(&sa, 0, sizeof(sa));  in sethandler()
47 	sa.sa_sigaction = handler;  in sethandler()
48 	sa.sa_flags = SA_SIGINFO | flags;  in sethandler()
49 	sigemptyset(&sa.sa_mask);  in sethandler()
50 	if (sigaction(sig, &sa, 0))  in sethandler()
56 	struct sigaction sa;  in clearhandler()  local
57 	memset(&sa, 0, sizeof(sa));  in clearhandler()
58 	sa.sa_handler = SIG_DFL;  in clearhandler()
59 	sigemptyset(&sa.sa_mask);  in clearhandler()
60 	if (sigaction(sig, &sa, 0))  in clearhandler()