sortix--sortix/kernel/fs/null.h

/*
 * Copyright (c) 2013 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * fs/null.h
 * Bit bucket special device.
 */

#ifndef SORTIX_FS_NULL_H
#define SORTIX_FS_NULL_H

#include <sortix/kernel/inode.h>

namespace Sortix {

class Null : public AbstractInode
{
public:
	Null(dev_t dev, ino_t ino, uid_t owner, gid_t group, mode_t mode);
	virtual ~Null();
	virtual ssize_t read(ioctx_t* ctx, uint8_t* buf, size_t count);
	virtual ssize_t pread(ioctx_t* ctx, uint8_t* buf, size_t count, off_t off);
	virtual ssize_t write(ioctx_t* ctx, const uint8_t* buf, size_t count);
	virtual ssize_t pwrite(ioctx_t* ctx, const uint8_t* buf, size_t count,
	                       off_t off);
};

} // namespace Sortix

#endif