genode/base-hw/include/base/ipc_msgbuf.h
2013-01-10 21:44:47 +01:00

72 lines
1.4 KiB
C++

/*
* \brief IPC message buffers
* \author Martin Stein
* \date 2012-01-03
*/
/*
* Copyright (C) 2012-2013 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__BASE__IPC_MSGBUF_H_
#define _INCLUDE__BASE__IPC_MSGBUF_H_
namespace Genode
{
/**
* IPC message buffer layout
*/
class Msgbuf_base
{
protected:
size_t _size; /* buffer size in bytes */
public:
char buf[]; /* begin of actual message buffer */
/*************************************************
** 'buf' must be the last member of this class **
*************************************************/
/**
* Return size of message buffer
*/
inline size_t size() const { return _size; }
/**
* Return address of message buffer
*/
inline void *addr() { return &buf[0]; }
};
/**
* Instance of IPC message buffer with specified buffer size
*
* 'Msgbuf_base' must be the last class this class inherits from.
*/
template <unsigned BUF_SIZE>
class Msgbuf : public Msgbuf_base
{
public:
/**************************************************
** 'buf' must be the first member of this class **
**************************************************/
char buf[BUF_SIZE];
/**
* Constructor
*/
Msgbuf() { _size = BUF_SIZE; }
};
}
#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */