mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 22:23:16 +00:00
55 lines
1.1 KiB
C++
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_ */
|