Disk ARchive 2.4.2
null_file.hpp
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00001 /*********************************************************************/
00002 // dar - disk archive - a backup/restoration program
00003 // Copyright (C) 2002-2052 Denis Corbin
00004 //
00005 // This program is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU General Public License
00007 // as published by the Free Software Foundation; either version 2
00008 // of the License, or (at your option) any later version.
00009 //
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018 //
00019 // to contact the author : http://dar.linux.free.fr/email.html
00020 /*********************************************************************/
00021 // $Id: null_file.hpp,v 1.21 2011/04/17 13:12:29 edrusb Rel $
00022 //
00023 /*********************************************************************/
00024 
00030 
00031 #ifndef NULL_FILE_HPP
00032 #define NULL_FILE_HPP
00033 
00034 #include "../my_config.h"
00035 #include "generic_file.hpp"
00036 #include "thread_cancellation.hpp"
00037 
00038 namespace libdar
00039 {
00040 
00043 
00045 
00052 
00053     class null_file : public generic_file, public thread_cancellation
00054     {
00055     public :
00056         null_file(gf_mode m) : generic_file(m) {};
00057         bool skip(const infinint &pos) { return true; };
00058         bool skip_to_eof() { return true; };
00059         bool skip_relative(signed int x) { return false; };
00060         infinint get_position() { return 0; };
00061 
00062     protected :
00063         U_I inherited_read(char *a, U_I size)
00064         {
00065 #ifdef MUTEX_WORKS
00066             check_self_cancellation();
00067 #endif
00068             return 0;
00069         };
00070 
00071         void inherited_write(const char *a, U_I size)
00072         {
00073 #ifdef MUTEX_WORKS
00074             check_self_cancellation();
00075 #endif
00076         };
00077 
00078         void inherited_sync_write() {};
00079 
00080         void inherited_terminate() {};
00081     };
00082 
00084 
00085 } // end of namespace
00086 
00087 #endif
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