ceph/src/boost/libs/asio/example/cpp11/echo/blocking_tcp_echo_server.cpp

   1 //
   2 // blocking_tcp_echo_server.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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 <thread>
  14 #include <utility>
  15 #include <boost/asio.hpp>
  16
  17 using boost::asio::ip::tcp;
  18
  19 const int max_length = 1024;
  20
  21 void session(tcp::socket sock)
  22 {
  23   try
  24   {
  25     for (;;)
  26     {
  27       char data[max_length];
  28
  29       boost::system::error_code error;
  30       size_t length = sock.read_some(boost::asio::buffer(data), error);
  31       if (error == boost::asio::error::eof)
  32         break; // Connection closed cleanly by peer.
  33       else if (error)
  34         throw boost::system::system_error(error); // Some other error.
  35
  36       boost::asio::write(sock, boost::asio::buffer(data, length));
  37     }
  38   }
  39   catch (std::exception& e)
  40   {
  41     std::cerr << "Exception in thread: " << e.what() << "\n";
  42   }
  43 }
  44
  45 void server(boost::asio::io_context& io_context, unsigned short port)
  46 {
  47   tcp::acceptor a(io_context, tcp::endpoint(tcp::v4(), port));
  48   for (;;)
  49   {
  50     std::thread(session, a.accept()).detach();
  51   }
  52 }
  53
  54 int main(int argc, char* argv[])
  55 {
  56   try
  57   {
  58     if (argc != 2)
  59     {
  60       std::cerr << "Usage: blocking_tcp_echo_server <port>\n";
  61       return 1;
  62     }
  63
  64     boost::asio::io_context io_context;
  65
  66     server(io_context, std::atoi(argv[1]));
  67   }
  68   catch (std::exception& e)
  69   {
  70     std::cerr << "Exception: " << e.what() << "\n";
  71   }
  72
  73   return 0;
  74 }