540 	struct sigaction sa;  in main()  local
687 	sa.sa_sigaction = sig_action_SIGUSR1;  in main()
688 	sigemptyset(&sa.sa_mask);  in main()
689 	sigaddset(&sa.sa_mask, SIGHUP);  in main()
690 	sigaddset(&sa.sa_mask, SIGINT);  in main()
691 	sigaddset(&sa.sa_mask, SIGQUIT);  in main()
692 	sigaddset(&sa.sa_mask, SIGTERM);  in main()
693 	sa.sa_flags = SA_SIGINFO;  in main()
694 	if (sigaction(SIGUSR1, &sa, NULL) == -1)  in main()
696 	sa.sa_sigaction = sig_action;  in main()
697 	if (sigaction(SIGHUP, &sa, NULL) == -1)  in main()
699 	if (sigaction(SIGINT, &sa, NULL) == -1)  in main()
701 	if (sigaction(SIGQUIT, &sa, NULL) == -1)  in main()
703 	if (sigaction(SIGTERM, &sa, NULL) == -1)  in main()