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src
libdar
null_file.hpp
Go to the documentation of this file.
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/*********************************************************************/
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// dar - disk archive - a backup/restoration program
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// Copyright (C) 2002-2052 Denis Corbin
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//
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// to contact the author : http://dar.linux.free.fr/email.html
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/*********************************************************************/
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#ifndef NULL_FILE_HPP
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#define NULL_FILE_HPP
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#include "../my_config.h"
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#include "
generic_file.hpp
"
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#include "
thread_cancellation.hpp
"
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namespace
libdar
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{
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class
null_file
:
public
generic_file
,
public
thread_cancellation
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{
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public
:
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null_file
(
gf_mode
m) :
generic_file
(m) {};
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bool
skip
(
const
infinint
&pos) {
return
true
; };
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bool
skip_to_eof
() {
return
true
; };
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bool
skip_relative(
signed
int
x) {
return
false
; };
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infinint
get_position
() {
return
0; };
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#ifdef LIBDAR_SPECIAL_ALLOC
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USE_SPECIAL_ALLOC(
null_file
);
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#endif
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protected
:
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U_I
inherited_read
(
char
*a, U_I size)
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{
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#ifdef MUTEX_WORKS
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check_self_cancellation
();
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#endif
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return
0;
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};
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void
inherited_write
(
const
char
*a, U_I size)
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{
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#ifdef MUTEX_WORKS
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check_self_cancellation
();
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#endif
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};
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void
inherited_sync_write
() {};
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void
inherited_terminate
() {};
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};
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}
// end of namespace
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#endif
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