text: /*	$OpenBSD: ioccom.h,v 1.4 2006/05/18 21:27:25 miod Exp $	*/
  /*	$NetBSD: ioccom.h,v 1.4 1994/10/30 21:49:56 cgd Exp $	*/
  
  /*-
   * Copyright (c) 1982, 1986, 1990, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)ioccom.h	8.2 (Berkeley) 3/28/94
   */
  
  #ifndef	_SYS_IOCCOM_H_
  #define	_SYS_IOCCOM_H_
  
  /*
   * Ioctl's have the command encoded in the lower word, and the size of
   * any in or out parameters in the upper word.  The high 3 bits of the
   * upper word are used to encode the in/out status of the parameter.
   */
  #define	IOCPARM_MASK	0x1fff		/* parameter length, at most 13 bits */
  #define	IOCPARM_LEN(x)	(((x) >> 16) & IOCPARM_MASK)
  #define	IOCBASECMD(x)	((x) & ~(IOCPARM_MASK << 16))
  #define	IOCGROUP(x)	(((x) >> 8) & 0xff)
  
  #define	IOCPARM_MAX	NBPG	/* max size of ioctl args, mult. of NBPG */
  				/* no parameters */
  #define	IOC_VOID	(unsigned long)0x20000000
  				/* copy parameters out */
  #define	IOC_OUT		(unsigned long)0x40000000
  				/* copy parameters in */
  #define	IOC_IN		(unsigned long)0x80000000
  				/* copy parameters in and out */
  #define	IOC_INOUT	(IOC_IN|IOC_OUT)
  				/* mask for IN/OUT/VOID */
  #define	IOC_DIRMASK	(unsigned long)0xe0000000
  
  #define	_IOC(inout,group,num,len) \
  	(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
  #define	_IO(g,n)	_IOC(IOC_VOID,	(g), (n), 0)
  #define	_IOR(g,n,t)	_IOC(IOC_OUT,	(g), (n), sizeof(t))
  #define	_IOW(g,n,t)	_IOC(IOC_IN,	(g), (n), sizeof(t))
  /* this should be _IORW, but stdio got there first */
  #define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))
  
  #endif /* !_SYS_IOCCOM_H_ */
  