for( elapsed = ((double) (clock() - start)) / CLOCKS_PER_SEC; elapsed < 10.0; elapsed = ((double) (clock() - start)) / CLOCKS_PER_SEC )
	{
		FD_ZERO(&readset);
		FD_SET(s, &readset);

		if ( select(0, &readset, NULL, NULL, NULL) == 1) {
			if (FD_ISSET(s, &readset)) {
				recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *)&from, &fromlen);
				printf("%s is online\n", inet_ntoa(from.sin_addr)); 
			}
		} else {
			printf("Error in select()'s return\n");
		}

		printf("%f secs past\n", elapsed);
	}