socket = raw_socket();
hosts = [<some_hosts>]
foreach (hosts as host) {
	send(socket,icmp(host))
}
sent_at = time()

while (time() - sent_at < timeout) {
	while (packet = read_buffer(socket)) {
		if (packet.host in hosts) {
			host_alive(host);
			remove_buffer(packet);
		}
	}
}