/****************************************************************************
 * This file was derived from the CNCL library by the Pablo research group.
 *
 * The complete CNCL library is available at:
 *       http://www.comnets.rwth-aachen.de/doc/cncl.html
 *
 * The CNCL copyright notice is included here:
 *
 * |_|_|_  |_|_    |_    |_|_|_  |_               C O M M U N I C A T I O N
 *|_       |_  |_  |_  |_        |_                         N E T W O R K S
 *|_       |_  |_  |_  |_        |_                               C L A S S
 * |_|_|_  |_    |_|_    |_|_|_  |_|_|_|_                     L I B R A R Y
 *
 *
 *
 * Copyright (C) 1992-1998   Communication Networks
 *                           Aachen University of Technology
 *                           D-52056 Aachen
 *                           Germany
 *                           Email: cncl-adm@comnets.rwth-aachen.de
 *
 *
 * 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
 * Library General Public License along with  this library; if not, write
 * to the Free Software Foundation,  675  Mass Ave, Cambridge, MA  02139,
 * USA.
 ****************************************************************************/

//   -*- C++ -*-
/*****************************************************************************
 *
 * Class: FlPipe --- UNIX pipe
 *
 *****************************************************************************/

#ifndef __FlPipe_h
#define __FlPipe_h


#include <FlObject.h>
#include <FlString.h>

#include <fstream>

/*
 * The class FlPipe
 */

class FlPipe : public FlObject
{
public:
    int open(const FlString& program);  // Open pipe to program
    int close();			// Close pipe

    ostream & out() { return *sout; }	// Output stream
    std::istream & in () { return *sin;  }	// Input stream

    int fd_in()     { return fdin;  }
    int fd_out()    { return fdout; }

    int get_pid()   { return pid;   }

    // Private members
private:
    int pid;				// PID program
    FlString program;			// Program name
    std::ifstream *sin;			// Input stream (from program)
    std::ofstream *sout;			// Output stream (to program)
    int fdin, fdout;			// Pipe file descriptors

    /***** Constructors ******************************************************/
public:
    FlPipe();
    FlPipe(const FlString& prog);
    ~FlPipe()  {    close();	}
    
		    
    // Print/debug output
    virtual void print(ostream &strm = cout) const;
    virtual void dump (ostream &strm = cout) const;
};


#endif /**__FlPipe_h**/
