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Source listing for Daytime.5

// server.cpp
// ~~~~~~~~~~
// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at

#include <ctime>
#include <iostream>
#include <string>
#include <boost/array.hpp>
#include <boost/asio.hpp>

using boost::asio::ip::udp;

std::string make_daytime_string()
  using namespace std; // For time_t, time and ctime;
  time_t now = time(0);
  return ctime(&now);

int main()
    boost::asio::io_service io_service;

    udp::socket socket(io_service, udp::endpoint(udp::v4(), 13));

    for (;;)
      boost::array<char, 1> recv_buf;
      udp::endpoint remote_endpoint;
      boost::system::error_code error;
          remote_endpoint, 0, error);

      if (error && error != boost::asio::error::message_size)
        throw boost::system::system_error(error);

      std::string message = make_daytime_string();

      boost::system::error_code ignored_error;
          remote_endpoint, 0, ignored_error);
  catch (std::exception& e)
    std::cerr << e.what() << std::endl;

  return 0;

Return to Daytime.5 - A synchronous UDP daytime server