ioctl.h revision c97989161fbe75bc14cea477a5443bbf474dd3ad
/* $Id$ */
/** @file
* VBox L4/OSS audio - header for Linux IoCtls.
*/
/*
* Copyright (C) 2006-2007 innotek GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License as published by the Free Software Foundation,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
#ifndef __VBOX_L4_OSS_IOCTL
#define __VBOX_L4_OSS_IOCTL
#define IOCPARM_MASK 0x3fff /* parameters must be < 16383 bytes */
#define IOC_VOID 0U << 30 /* no parameters */
#define IOC_IN 1U << 30 /* copy out parameters */
#define IOC_OUT 2U << 30 /* copy in parameters */
#define IOC_INOUT (IOC_IN|IOC_OUT)
/* the 0x20000000 is so we can distinguish new ioctl's from old */
#define _IO(x,y) ((int)(IOC_VOID|(x<<8)|y))
#define _IOR(x,y,t) ((int)(IOC_OUT|((sizeof(t)&IOCPARM_MASK)<<16)|(x<<8)|y))
#define _IOW(x,y,t) ((int)(IOC_IN|((sizeof(t)&IOCPARM_MASK)<<16)|(x<<8)|y))
/* this should be _IORW, but stdio got there first */
#define _IOWR(x,y,t) ((int)(IOC_INOUT|((sizeof(t)&IOCPARM_MASK)<<16)|(x<<8)|y))
#define _IOC_SIZE(x) ((x>>16)&IOCPARM_MASK)
#define _IOC_DIR(x) (x & 0xf0000000)
#define _IOC_NONE IOC_VOID
#define _IOC_READ IOC_OUT
#define _IOC_WRITE IOC_IN
#endif /* __VBOX_L4_OSS_IOCTL */