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60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
/*
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* \brief null filesystem
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* \author Josef Soentgen
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* \author Norman Feske
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* \date 2012-07-31
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*/
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/*
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* Copyright (C) 2012-2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__VFS__NULL_FILE_SYSTEM_H_
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#define _INCLUDE__VFS__NULL_FILE_SYSTEM_H_
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#include <vfs/single_file_system.h>
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namespace Vfs { class Null_file_system; }
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struct Vfs::Null_file_system : Single_file_system
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{
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Null_file_system(Xml_node config)
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:
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Single_file_system(NODE_TYPE_CHAR_DEVICE, name(), config)
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{ }
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static char const *name() { return "null"; }
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/********************************
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** File I/O service interface **
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********************************/
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Write_result write(Vfs_handle *handle, char const *, file_size count,
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file_size &out_count) override
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{
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out_count = count;
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return WRITE_OK;
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}
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Read_result read(Vfs_handle *vfs_handle, char *, file_size,
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file_size &out_count) override
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{
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out_count = 0;
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return READ_OK;
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}
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Ftruncate_result ftruncate(Vfs_handle *vfs_handle, file_size) override
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{
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return FTRUNCATE_OK;
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}
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};
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#endif /* _INCLUDE__VFS__NULL_FILE_SYSTEM_H_ */
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