55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
/*
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* \brief Symlink file-system node
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* \author Norman Feske
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* \date 2012-04-11
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*/
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/*
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* Copyright (C) 2012-2015 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__RAM_FS__SYMLINK_H_
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#define _INCLUDE__RAM_FS__SYMLINK_H_
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/* local includes */
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#include <ram_fs/node.h>
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namespace File_system { class Symlink; }
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class File_system::Symlink : public Node
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{
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private:
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char _link_to[MAX_PATH_LEN];
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size_t _len;
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public:
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Symlink(char const *name): _len(0) { Node::name(name); }
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size_t read(char *dst, size_t len, seek_off_t seek_offset)
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{
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size_t count = min(len, _len-seek_offset);
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Genode::memcpy(dst, _link_to+seek_offset, count);
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return count;
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}
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size_t write(char const *src, size_t len, seek_off_t seek_offset)
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{
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/* Ideal symlink operations are atomic. */
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if (seek_offset) return 0;
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_len = min(len, sizeof(_link_to));
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Genode::memcpy(_link_to, src, _len);
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return _len;
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}
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file_size_t length() const { return _len; }
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};
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#endif /* _INCLUDE__RAM_FS__SYMLINK_H_ */
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