genode/repos/dde_rump/src/server/rump_fs/symlink.h

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/**
* \brief Rump symlink node
* \author Sebastian Sumpf
* \date 2014-01-20
*/
/*
* Copyright (C) 2014 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 _SYMLINK_H_
#define _SYMLINK_H_
/* Genode includes */
#include <file_system/util.h>
#include <os/path.h>
#include "node.h"
namespace File_system {
class Symlink;
}
class File_system::Symlink : public Node
{
private:
typedef Genode::Path<MAX_PATH_LEN> Path;
Path _path;
bool _create;
public:
Symlink(char const *dir, char const *name, bool create)
: Node(0), _path(name, dir), _create(create)
{
Node::name(name);
}
Symlink(char const *path)
: Node(0), _path(path), _create(false)
{
Node::name(basename(path));
}
size_t write(char const *src, size_t len, seek_off_t seek_offset)
{
/* Ideal symlink operations are atomic. */
if (!_create || seek_offset)
return 0;
int ret = rump_sys_symlink(src, _path.base());
return ret == -1 ? 0 : ret;
}
size_t read(char *dst, size_t len, seek_off_t seek_offset)
{
int ret = rump_sys_readlink(_path.base(), dst, len);
return ret == -1 ? 0 : ret;
}
file_size_t length()
{
char link_to[MAX_PATH_LEN];
return read(link_to, MAX_PATH_LEN, 0);
}
};
#endif /* _SYMLINK_H_ */