evChannel.h

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/*
 *
 * EVITA: Efficient Visualization of Terascale Datasets
 * Copyright (C) 2000-2016  Team Evita
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This 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
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
 * MA 02139, USA.
 *
 */


#ifndef __evChannel_h
#define __evChannel_h


#include <sys/select.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#include "evSignal.h"
#include "evBitBuffer.h"


#define EVPORT_COMMANDCHANNEL 11900

#define EVPORT_BITSTREAMCHANNEL 11901
#define EVPORT_PRIORITYSCHEDULECHANNEL 11902

#define EVCHANNEL_FROMCHANNEL "**channel**"

#define EVCHANNEL_SERVERTIMEOUT 5
#define EVCHANNEL_NOFORK 0
#define EVCHANNEL_FORK 1
#define EVCHANNEL_NOWAIT 0
#define EVCHANNEL_WAIT 1


class evChannel : public evBitBuffer
{
public:
  evChannel(void);
  virtual ~evChannel(void);
  
  virtual const evString GetClassName(void) const
  {
    return(evString("evChannel"));
  }

  int Close(void);

  int Create(const int port);
  int GetClientConnection(const int direction,
                          const int fork_process,
                          const int wait);

  int ConnectToServer(const evString &hostname,
                      const int port,
                      const int direction);

  int IsReady(void);

  int CopyFileToChannel(const evString &filename);

  int ReadCommand(evString &command);
  int ReadCommandValue(int &command_value);
  int ReadCommandValue(double &command_value);
  int ReadCommandValue(evString &command_value);
  int ReadCommandValue(evVector &command_value);
  int WriteCommand(const evString &command);
  int WriteCommand(const evString &command, const int command_value);
  int WriteCommand(const evString &command, const double command_value);
  int WriteCommand(const evString &command, const evString &command_value);
  int WriteCommand(const evString &command, const evVector &command_value);

protected:

private:
  int Socket;
  struct sockaddr_in LocalAddress;
  struct sockaddr_in RemoteAddress;
  evString RemoteHost;

  static void CleanupChildren(int signal_number);

};



#endif