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- //
- // blocking_udp_echo_server.cpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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 http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <cstdlib>
- #include <iostream>
- #include <boost/asio.hpp>
- using boost::asio::ip::udp;
- enum { max_length = 1024 };
- void server(boost::asio::io_context& io_context, unsigned short port)
- {
- udp::socket sock(io_context, udp::endpoint(udp::v4(), port));
- for (;;)
- {
- char data[max_length];
- udp::endpoint sender_endpoint;
- size_t length = sock.receive_from(
- boost::asio::buffer(data, max_length), sender_endpoint);
- sock.send_to(boost::asio::buffer(data, length), sender_endpoint);
- }
- }
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 2)
- {
- std::cerr << "Usage: blocking_udp_echo_server <port>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- server(io_context, std::atoi(argv[1]));
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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