return "user defined signal 1"
	case SIGSEGV:
		return "segmentation fault"
	case SIGUSR2:
		return "user defined signal 2"
	case SIGPIPE:
		return "broken pipe"
	case SIGALRM:
		return "alarm clock"
	case SIGTERM:
		return "terminated"
	case SIGCHLD:
		return "child exited"
	case SIGCONT:
		return "continued"
	case SIGSTOP:
		return "stopped (signal)"
	case SIGTSTP:
		return "stopped"