sys/sys/ioccom.h

   1 /*-
   2  * Copyright (c) 1982, 1986, 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)ioccom.h    8.2 (Berkeley) 3/28/94
  30  * $FreeBSD: src/sys/sys/ioccom.h,v 1.9 1999/12/29 04:24:42 peter Exp $
  31  */
  32
  33 #ifndef _SYS_IOCCOM_H_
  34 #define _SYS_IOCCOM_H_
  35
  36 /*
  37  * Ioctl's have the command encoded in the lower word, and the size of
  38  * any in or out parameters in the upper word.  The high 3 bits of the
  39  * upper word are used to encode the in/out status of the parameter.
  40  */
  41 #define IOCPARM_SHIFT   13              /* number of bits for ioctl size */
  42 #define IOCPARM_MASK    ((1 << IOCPARM_SHIFT) - 1) /* parameter length mask */
  43 #define IOCPARM_LEN(x)  (((x) >> 16) & IOCPARM_MASK)
  44 #define IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << 16))
  45 #define IOCGROUP(x)     (((x) >> 8) & 0xff)
  46
  47 #define IOCPARM_MAX     ((1 << IOCPARM_SHIFT) - 1) /* max size of ioctl */
  48 #define IOC_VOID        0x20000000      /* no parameters */
  49 #define IOC_OUT         0x40000000      /* copy out parameters */
  50 #define IOC_IN          0x80000000      /* copy in parameters */
  51 #define IOC_INOUT       (IOC_IN|IOC_OUT)
  52 #define IOC_DIRMASK     (IOC_VOID|IOC_OUT|IOC_IN)
  53
  54 #define _IOC(inout,group,num,len)       ((unsigned long) \
  55         ((inout) | (((len) & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
  56 #define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
  57 #define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
  58 #define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
  59 /* this should be _IORW, but stdio got there first */
  60 #define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
  61
  62 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
  63
  64 #include <sys/cdefs.h>
  65
  66 __BEGIN_DECLS
  67 int     ioctl(int, unsigned long, ...);
  68 __END_DECLS
  69
  70 #endif
  71
  72 #endif /* !_SYS_IOCCOM_H_ */