c3c6a82d13
By separating the VFS from Noux, we become able to reuse the VFS for libc-using programs. The most substantial change is the removal of Noux::Sysio data structures from the VFS. Instead, the Noux::Sysio refers to the VFS types now. The new VFS library is located at 'os/include/vfs/'. Furthermore, the patch removes various code duplications related to pseudo file systems that provide a single file (block, zero, random, terminal, null). The new 'Single_file_system' holds the common boilerplate code for those. Issue #999
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
/*
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* \brief zero 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__ZERO_FILE_SYSTEM_H_
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#define _INCLUDE__VFS__ZERO_FILE_SYSTEM_H_
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#include <vfs/file_system.h>
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namespace Vfs { class Zero_file_system; }
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struct Vfs::Zero_file_system : Single_file_system
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{
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Zero_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 "zero"; }
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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 *, char const *, size_t count, size_t &count_out) override
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{
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count_out = count;
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return WRITE_OK;
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}
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Read_result read(Vfs_handle *vfs_handle, char *dst, size_t count, size_t &out_count) override
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{
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memset(dst, 0, count);
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out_count = count;
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return READ_OK;
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}
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};
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#endif /* _INCLUDE__VFS__ZERO_FILE_SYSTEM_H_ */
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