| // |
| // server.cpp |
| // ~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2016 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 <ctime> |
| #include <iostream> |
| #include <string> |
| #include <boost/array.hpp> |
| #include <asio.hpp> |
| |
| using asio::ip::udp; |
| |
| std::string make_daytime_string() |
| { |
| using namespace std; // For time_t, time and ctime; |
| time_t now = time(0); |
| return ctime(&now); |
| } |
| |
| int main() |
| { |
| try |
| { |
| asio::io_context io_context; |
| |
| udp::socket socket(io_context, udp::endpoint(udp::v4(), 13)); |
| |
| for (;;) |
| { |
| boost::array<char, 1> recv_buf; |
| udp::endpoint remote_endpoint; |
| asio::error_code error; |
| socket.receive_from(asio::buffer(recv_buf), |
| remote_endpoint, 0, error); |
| |
| if (error && error != asio::error::message_size) |
| throw asio::system_error(error); |
| |
| std::string message = make_daytime_string(); |
| |
| asio::error_code ignored_error; |
| socket.send_to(asio::buffer(message), |
| remote_endpoint, 0, ignored_error); |
| } |
| } |
| catch (std::exception& e) |
| { |
| std::cerr << e.what() << std::endl; |
| } |
| |
| return 0; |
| } |