97 	struct sigaction sa;  in sethandler()  local
98 	memset(&sa, 0, sizeof(sa));  in sethandler()
99 	sa.sa_sigaction = handler;  in sethandler()
100 	sa.sa_flags = SA_SIGINFO | flags;  in sethandler()
101 	sigemptyset(&sa.sa_mask);  in sethandler()
102 	if (sigaction(sig, &sa, 0))  in sethandler()
108 	struct sigaction sa;  in clearhandler()  local
109 	memset(&sa, 0, sizeof(sa));  in clearhandler()
110 	sa.sa_handler = SIG_DFL;  in clearhandler()
111 	sigemptyset(&sa.sa_mask);  in clearhandler()
112 	if (sigaction(sig, &sa, 0))  in clearhandler()