ceph/src/boost/libs/asio/example/cpp03/tutorial/daytime5/server.cpp

   1 //
   2 // server.cpp
   3 // ~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <ctime>
  12 #include <iostream>
  13 #include <string>
  14 #include <boost/array.hpp>
  15 #include <boost/asio.hpp>
  16
  17 using boost::asio::ip::udp;
  18
  19 std::string make_daytime_string()
  20 {
  21   using namespace std; // For time_t, time and ctime;
  22   time_t now = time(0);
  23   return ctime(&now);
  24 }
  25
  26 int main()
  27 {
  28   try
  29   {
  30     boost::asio::io_service io_service;
  31
  32     udp::socket socket(io_service, udp::endpoint(udp::v4(), 13));
  33
  34     for (;;)
  35     {
  36       boost::array<char, 1> recv_buf;
  37       udp::endpoint remote_endpoint;
  38       boost::system::error_code error;
  39       socket.receive_from(boost::asio::buffer(recv_buf),
  40           remote_endpoint, 0, error);
  41
  42       if (error && error != boost::asio::error::message_size)
  43         throw boost::system::system_error(error);
  44
  45       std::string message = make_daytime_string();
  46
  47       boost::system::error_code ignored_error;
  48       socket.send_to(boost::asio::buffer(message),
  49           remote_endpoint, 0, ignored_error);
  50     }
  51   }
  52   catch (std::exception& e)
  53   {
  54     std::cerr << e.what() << std::endl;
  55   }
  56
  57   return 0;
  58 }