//# MMapIO.cc: Memory-mapped IO on a file
//#
//# Copyright (C) 2009
//# Associated Universities, Inc. Washington DC, USA.
//#
//# 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 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//#  $Id$

#include <casacore/casa/IO/MMapIO.h>
#include <casacore/casa/IO/RegularFileIO.h>
#include <casacore/casa/Exceptions/Error.h>

namespace casacore
{
  
MMapIO::MMapIO (const RegularFile& regularFile, ByteIO::OpenOption option)
{
  int fdes = RegularFileIO::openCreate (regularFile, option);
  map (fdes, regularFile.path().originalName());
  if (option == ByteIO::Append) {
    seek (0, ByteIO::End);
  }
}

MMapIO::~MMapIO()
{
  unmapFile();
  close (fd());
}

} // end namespace