54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
//
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// blocking_udp_echo_server.cpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <cstdlib>
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#include <iostream>
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#include <boost/asio.hpp>
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using boost::asio::ip::udp;
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enum { max_length = 1024 };
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void server(boost::asio::io_context& io_context, unsigned short port)
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{
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udp::socket sock(io_context, udp::endpoint(udp::v4(), port));
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for (;;)
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{
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char data[max_length];
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udp::endpoint sender_endpoint;
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size_t length = sock.receive_from(
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boost::asio::buffer(data, max_length), sender_endpoint);
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sock.send_to(boost::asio::buffer(data, length), sender_endpoint);
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}
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}
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: blocking_udp_echo_server <port>\n";
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return 1;
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}
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boost::asio::io_context io_context;
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using namespace std; // For atoi.
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server(io_context, atoi(argv[1]));
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}
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catch (std::exception& e)
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{
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std::cerr << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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