ceph/src/boost/libs/asio/example/cpp03/echo/blocking_udp_echo_server.cpp

   1 //
   2 // blocking_udp_echo_server.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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 <cstdlib>
  12 #include <iostream>
  13 #include <boost/asio.hpp>
  14
  15 using boost::asio::ip::udp;
  16
  17 enum { max_length = 1024 };
  18
  19 void server(boost::asio::io_context& io_context, unsigned short port)
  20 {
  21   udp::socket sock(io_context, udp::endpoint(udp::v4(), port));
  22   for (;;)
  23   {
  24     char data[max_length];
  25     udp::endpoint sender_endpoint;
  26     size_t length = sock.receive_from(
  27         boost::asio::buffer(data, max_length), sender_endpoint);
  28     sock.send_to(boost::asio::buffer(data, length), sender_endpoint);
  29   }
  30 }
  31
  32 int main(int argc, char* argv[])
  33 {
  34   try
  35   {
  36     if (argc != 2)
  37     {
  38       std::cerr << "Usage: blocking_udp_echo_server <port>\n";
  39       return 1;
  40     }
  41
  42     boost::asio::io_context io_context;
  43
  44     using namespace std; // For atoi.
  45     server(io_context, atoi(argv[1]));
  46   }
  47   catch (std::exception& e)
  48   {
  49     std::cerr << "Exception: " << e.what() << "\n";
  50   }
  51
  52   return 0;
  53 }