ipv4_udp_server.cpp

This is an example of how to use the Conexus::IPv4::UDP class.

/***************************************************************************
 *   Copyright (C) 2001 by Rick L. Vinyard, Jr.                            *
 *   rvinyard@cs.nmsu.edu                                                  *
 *                                                                         *
 *   This file is part of the conexus library.                             *
 *                                                                         *
 *   The conexus library is free software; you can redistribute it and/or  *
 *   modify it under the terms of the GNU General Public License version 3 *
 *   as published by the Free Software Foundation.                         *
 *                                                                         *
 *   The conexus library is distributed in the hope that it will be        *
 *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
 *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU   *
 *   General Public License for more details.                              *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
 ***************************************************************************/
#include <conexus.h>

#include <sys/types.h>
#include <unistd.h>
#include <iostream>
#include <glibmm.h>

// prototypes of the three print callback functions
void print_data1(const Conexus::Data d);
void print_data2(const Conexus::Data d);
void print_data3(const Conexus::Data d);

int main(int argc, char* argv[]) {
  Glib::ustring interface;
  int port = 1500;
  int run_time = 20;

  Glib::OptionContext option_context( "- IPv4 UDP Server" );
  Glib::OptionGroup option_group( "Options", "" );

  Glib::OptionEntry option_interface;
  option_interface.set_long_name( "if" );
  option_interface.set_description( "Interface address to receive data on [ default = any ]" );
  option_group.add_entry( option_interface, interface );

  Glib::OptionEntry option_port;
  option_port.set_long_name( "port" );
  option_port.set_description( "Port to receive data on [default=1500]" );
  option_group.add_entry( option_port, port );

  Glib::OptionEntry option_run_time;
  option_run_time.set_long_name( "run" );
  option_run_time.set_description( "Running time in seconds [default=20]" );
  option_group.add_entry( option_run_time, run_time );

  option_context.set_main_group( option_group );

  option_context.parse( argc, argv );

  // Initialize the Conexus library
  // This is needed because we will use threaded servers and this
  // will do all the behind the scenes work to initialize pthreads
  Conexus::init();

  // Declare the udp object
  Conexus::IPv4::UDP::pointer udp;

  if ( interface.size() == 0 )
    udp = Conexus::IPv4::UDP::create(port);
  else
    udp = Conexus::IPv4::UDP::create(interface, port);

  // The server connect method connects a provided sigc++ slot that will be called
  // back when the server receives any data.
  udp->signal_data().connect(sigc::ptr_fun(&print_data1));
  udp->signal_data().connect(sigc::ptr_fun(&print_data2));
  udp->signal_data().connect(sigc::ptr_fun(&print_data3));

  // Start the server. The server will spawn a separate thread to service
  // received data, so this call will immediately return after the thread
  // is spawned.
  udp->start();

  std::cout << "Main thread pid: " << pthread_self() << std::endl;
  // Set up a loop that will run and print the time every 5
  // seconds. Since the server is threaded, the sleep(1) call will not effect
  // the servicing thread.
  std::cout << "Starting..." << std::endl;
  std::cout << "Run time: " << run_time << std::endl;
  for (int i=0; i <= run_time; i++) {
    if (i%5 == 0)
      std::cout << "Time: " << i << std::endl;
    sleep(1);
  }
  std::cout << "Time: " << run_time << std::endl;

  // Stop the server and prepare for shutdown
  udp->stop();

  return 0;
}

// These are the three callback functions. Each simply prints out the data received.

void print_data1( const Conexus::Data d) {
  std::cout << "Responding thread pid: " << pthread_self() << std::endl;
  std::cout << "<1> Received " << d.size() << " bytes of data [" << d.hex_string() << "]\n";
}

void print_data2( const Conexus::Data d) {
  std::cout << "Responding thread pid: " << pthread_self() << std::endl;
  std::cout << "<2> Received " << d.size() << " bytes of data [" << d.hex_string() << "]\n";
}

void print_data3( const Conexus::Data d) {
  std::cout << "Responding thread pid: " << pthread_self() << std::endl;
  std::cout << "<3> Received " << d.size() << " bytes of data [" << d.hex_string() << "]\n";
}