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

   1 //
   2 // blocking_udp_echo_client.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 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 <cstring>
  13 #include <iostream>
  14 #include <boost/asio.hpp>
  15
  16 using boost::asio::ip::udp;
  17
  18 enum { max_length = 1024 };
  19
  20 int main(int argc, char* argv[])
  21 {
  22   try
  23   {
  24     if (argc != 3)
  25     {
  26       std::cerr << "Usage: blocking_udp_echo_client <host> <port>\n";
  27       return 1;
  28     }
  29
  30     boost::asio::io_context io_context;
  31
  32     udp::socket s(io_context, udp::endpoint(udp::v4(), 0));
  33
  34     udp::resolver resolver(io_context);
  35     udp::resolver::results_type endpoints =
  36       resolver.resolve(udp::v4(), argv[1], argv[2]);
  37
  38     using namespace std; // For strlen.
  39     std::cout << "Enter message: ";
  40     char request[max_length];
  41     std::cin.getline(request, max_length);
  42     size_t request_length = strlen(request);
  43     s.send_to(boost::asio::buffer(request, request_length), *endpoints.begin());
  44
  45     char reply[max_length];
  46     udp::endpoint sender_endpoint;
  47     size_t reply_length = s.receive_from(
  48         boost::asio::buffer(reply, max_length), sender_endpoint);
  49     std::cout << "Reply is: ";
  50     std::cout.write(reply, reply_length);
  51     std::cout << "\n";
  52   }
  53   catch (std::exception& e)
  54   {
  55     std::cerr << "Exception: " << e.what() << "\n";
  56   }
  57
  58   return 0;
  59 }