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diff --git a/network/akgnet_fdescr.hh b/network/akgnet_fdescr.hh
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+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+/
+/**
+ * INCLUDE: akgnet_fdescr.hh
+ *
+ * MODULE:  akg network
+ * CLASS:   FileDescriptor
+ *
+ * COMMENTS:
+ * Namespace akg
+ * 
+*/
+ 
+#ifndef AKGNET_FDESCR_HH
+#define AKGNET_FDESCR_HH
+
+#include "akgnet_common.hh"
+
+namespace akg
+  {
+  
+/**
+  This class the base class for a hierarchie, which are
+  envelopes for the usual OS file descriptors. They offer 
+  only that much functionallity as needed for our library
+  The objects of this hierarchie can't be copied!
+*/
+
+class FileDescriptor
+  {
+    public:
+      /// Destructor, if open, closes the file descriptor
+      ~FileDescriptor() throw();
+      
+      /// Returns the OS file descriptor
+      int  operator()() throw ();
+      
+      /** Returns true if the descriptor is open.
+          Be aware that closing the file descriptor by 
+	  using SO specific functions instead of the 
+	  methods of this class can lead to incorrect results
+      */
+      bool isOpen() throw();
+      
+      /// Closes the descriptor
+      void close()  throw();
+      
+      /// Returns the error number of the last operation
+      int  getErrno() throw();
+      
+      /** Writes the specified number of bytes from the
+          specified buffer. 
+	  Returns the number of bytes actually written
+      */
+      int  write(const void *buffer, int count) throw();
+      
+      /** Reads the specified number of bytes into the
+          specified buffer. 
+	  Returns the number of bytes actually read
+      */
+      int  read (void *buffer, int count) throw();
+      
+      /** Sets the non-blocking mode on or off
+          Returns true o succes
+      */
+      bool setNonBlocking(bool nonBlocking) throw();
+      
+      ///  Returns true if the descriptors is in non-blocking mode
+      bool isNonBlocking() throw();
+    protected:
+      /// Protected constructor
+      FileDescriptor() throw();
+      
+      /// Saves the errno
+      void saveErrno() throw();
+      
+      int  fileDescriptor;
+      int  savedErrno;
+    private:
+      /// unimplemented, objects can't be copied
+      FileDescriptor(const FileDescriptor&);
+      /// unimplemented, objects can't be copied
+      FileDescriptor& operator=(const FileDescriptor&);
+   }; 
+
+} // namespace 
+#endif