The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/ioccom.h

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    1 /*      $NetBSD: ioccom.h,v 1.7 2004/02/24 15:22:01 wiz Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1990, 1993, 1994
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ioccom.h    8.3 (Berkeley) 1/9/95
   32  */
   33 
   34 #ifndef _SYS_IOCCOM_H_
   35 #define _SYS_IOCCOM_H_
   36 
   37 /*
   38  * Ioctl's have the command encoded in the lower word, and the size of
   39  * any in or out parameters in the upper word.  The high 3 bits of the
   40  * upper word are used to encode the in/out status of the parameter.
   41  */
   42 #define IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
   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     NBPG    /* max size of ioctl args, mult. of NBPG */
   48                                 /* no parameters */
   49 #define IOC_VOID        (unsigned long)0x20000000
   50                                 /* copy parameters out */
   51 #define IOC_OUT         (unsigned long)0x40000000
   52                                 /* copy parameters in */
   53 #define IOC_IN          (unsigned long)0x80000000
   54                                 /* copy parameters in and out */
   55 #define IOC_INOUT       (IOC_IN|IOC_OUT)
   56                                 /* mask for IN/OUT/VOID */
   57 #define IOC_DIRMASK     (unsigned long)0xe0000000
   58 
   59 #define _IOC(inout,group,num,len) \
   60         (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
   61 #define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
   62 #define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
   63 #define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
   64 /* this should be _IORW, but stdio got there first */
   65 #define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
   66 
   67 #endif /* !_SYS_IOCCOM_H_ */

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