72 lines
1.4 KiB
C++
72 lines
1.4 KiB
C++
/*
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* \brief IPC message buffers
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* \author Martin Stein
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* \date 2012-01-03
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__BASE__IPC_MSGBUF_H_
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#define _INCLUDE__BASE__IPC_MSGBUF_H_
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namespace Genode
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{
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/**
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* IPC message buffer layout
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*/
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class Msgbuf_base
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{
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protected:
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size_t _size; /* buffer size in bytes */
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public:
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char buf[]; /* begin of actual message buffer */
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/*************************************************
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** 'buf' must be the last member of this class **
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*************************************************/
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/**
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* Return size of message buffer
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*/
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inline size_t size() const { return _size; }
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/**
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* Return address of message buffer
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*/
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inline void *addr() { return &buf[0]; }
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};
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/**
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* Instance of IPC message buffer with specified buffer size
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*
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* 'Msgbuf_base' must be the last class this class inherits from.
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*/
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template <unsigned BUF_SIZE>
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class Msgbuf : public Msgbuf_base
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{
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public:
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/**************************************************
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** 'buf' must be the first member of this class **
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**************************************************/
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char buf[BUF_SIZE];
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/**
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* Constructor
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*/
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Msgbuf() { _size = BUF_SIZE; }
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};
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}
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#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */
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