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Examples |

# echo/blocking_tcp_echo_server.cpp

    //
    // blocking_tcp_echo_server.cpp
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    //
    // Copyright (c) 2003-2007 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/bind.hpp>
    #include <boost/smart_ptr.hpp>
    #include "asio.hpp"

    using asio::ip::tcp;

    const int max_length = 1024;

    typedef boost::shared_ptr<tcp::socket> socket_ptr;

    void session(socket_ptr sock)
    {
      try
      {
        for (;;)
        {
          char data[max_length];

          asio::error_code error;
          size_t length = sock->read_some(asio::buffer(data), error);
          if (error == asio::error::eof)
            break; // Connection closed cleanly by peer.
          else if (error)
            throw asio::system_error(error); // Some other error.

          asio::write(*sock, asio::buffer(data, length));
        }
      }
      catch (std::exception& e)
      {
        std::cerr << "Exception in thread: " << e.what() << "\n";
      }
    }

    void server(asio::io_service& io_service, short port)
    {
      tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), port));
      for (;;)
      {
        socket_ptr sock(new tcp::socket(io_service));
        a.accept(*sock);
        asio::thread t(boost::bind(session, sock));
      }
    }

    int main(int argc, char* argv[])
    {
      try
      {
        if (argc != 2)
        {
          std::cerr << "Usage: blocking_tcp_echo_server <port>\n";
          return 1;
        }

        asio::io_service io_service;

        using namespace std; // For atoi.
        server(io_service, atoi(argv[1]));
      }
      catch (std::exception& e)
      {
        std::cerr << "Exception: " << e.what() << "\n";
      }

      return 0;
    }

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