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// $Id: RtclSignalAction.hpp 521 2013-05-20 22:16:45Z mueller $

//

// Copyright 2013- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

//

// This program is free software; you may redistribute and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation, either version 2, or at your option any later version.

//

// This program 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 complete details.

// 

// Revision History: 

// Date         Rev Version  Comment

// 2013-05-17   521   1.0    Initial version

// ---------------------------------------------------------------------------

/*!

  \file

  \version $Id: RtclSignalAction.hpp 521 2013-05-20 22:16:45Z mueller $

  \brief   Declaration of class RtclSignalAction.

*/

#ifndef included_Retro_RtclSignalAction

#define included_Retro_RtclSignalAction 1

// Note: on cpp environment _POSIX_C_SOURCE is already defined !!

#include <signal.h>

#include "tcl.h"

#include "librtools/RerrMsg.hpp"

#include "librtools/Rexception.hpp"

#include "librtcltools/RtclOPtr.hpp"

namespace Retro {

  class RtclSignalAction {

    public:

      static bool              Init(Tcl_Interp* interp, RerrMsg& emsg);

      static RtclSignalAction* Obj();

      bool          SetAction(int signum, Tcl_Obj* pobj, RerrMsg& emsg);

      bool          GetAction(int signum, Tcl_Obj*& pobj, RerrMsg& emsg);

      bool          ClearAction(int signum, RerrMsg& emsg);

    protected:

      bool          ValidSignal(int signum, RerrMsg& emsg);

      void          TclChannelHandler(int mask);

      static void   SignalHandler(int signum);

      static void   ThunkTclChannelHandler(ClientData cdata, int mask);

      static void   ThunkTclExitProc(ClientData cdata);

    private:

                    RtclSignalAction(Tcl_Interp* interp);

                   ~RtclSignalAction();

    protected:

      Tcl_Interp*   fpInterp;               //!< Tcl interpreter used

      int           fFdPipeRead;            //!< attn pipe read fd

      int           fFdPipeWrite;           //!< attn pipe write fd

      Tcl_Channel   fShuttleChn;            //!< Tcl channel

      bool          fActionSet[32];         //!< true if SetAction() done

      RtclOPtr      fpScript[32];           //!< action scripts

      struct sigaction fOldAction[32];      //!< original sigaction

    private:

      static RtclSignalAction* fpObj;       //!< pointer to singleton

  };

} // end namespace Retro

//#include "RtclSignalAction.ipp"

#endif