genode/repos/os/include/ram_fs/symlink.h
2015-08-21 10:58:58 +02:00

55 lines
1.1 KiB
C++

/*
* \brief Symlink file-system node
* \author Norman Feske
* \date 2012-04-11
*/
/*
* Copyright (C) 2012-2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__RAM_FS__SYMLINK_H_
#define _INCLUDE__RAM_FS__SYMLINK_H_
/* local includes */
#include <ram_fs/node.h>
namespace File_system { class Symlink; }
class File_system::Symlink : public Node
{
private:
char _link_to[MAX_PATH_LEN];
size_t _len;
public:
Symlink(char const *name): _len(0) { Node::name(name); }
size_t read(char *dst, size_t len, seek_off_t seek_offset)
{
size_t count = min(len, _len-seek_offset);
Genode::memcpy(dst, _link_to+seek_offset, count);
return count;
}
size_t write(char const *src, size_t len, seek_off_t seek_offset)
{
/* Ideal symlink operations are atomic. */
if (seek_offset) return 0;
_len = min(len, sizeof(_link_to));
Genode::memcpy(_link_to, src, _len);
return _len;
}
file_size_t length() const { return _len; }
};
#endif /* _INCLUDE__RAM_FS__SYMLINK_H_ */