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 /*-
    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  * 4. 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  * $FreeBSD$
   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_MASK    0x1fff          /* parameter length, at most 13 bits */
   42 #define IOCPARM_LEN(x)  (((x) >> 16) & IOCPARM_MASK)
   43 #define IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << 16))
   44 #define IOCGROUP(x)     (((x) >> 8) & 0xff)
   45 
   46 #define IOCPARM_MAX     PAGE_SIZE               /* max size of ioctl, mult. of PAGE_SIZE */
   47 #define IOC_VOID        0x20000000      /* no parameters */
   48 #define IOC_OUT         0x40000000      /* copy out parameters */
   49 #define IOC_IN          0x80000000      /* copy in parameters */
   50 #define IOC_INOUT       (IOC_IN|IOC_OUT)
   51 #define IOC_DIRMASK     0xe0000000      /* mask for IN/OUT/VOID */
   52 
   53 #define _IOC(inout,group,num,len) \
   54         ((unsigned long)(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
   55 #define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
   56 #define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
   57 #define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
   58 /* this should be _IORW, but stdio got there first */
   59 #define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
   60 
   61 #ifndef _KERNEL
   62 
   63 #include <sys/cdefs.h>
   64 
   65 __BEGIN_DECLS
   66 int     ioctl(int, unsigned long, ...);
   67 __END_DECLS
   68 
   69 #endif
   70 
   71 #endif /* !_SYS_IOCCOM_H_ */

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