ioctl.h

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    1 /*
    2  * Mach Operating System
    3  * Copyright (c) 1991 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie Mellon rights
   24  * to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        ioctl.h,v $
   29  * Revision 2.6  92/05/21  17:25:06  jfriedl
   30  *      Appended 'U' to constants that would otherwise be signed.
   31  *      [92/05/16            jfriedl]
   32  * 
   33  * Revision 2.5  91/10/09  16:18:46  af
   34  *       Revision 2.4.1.1  91/09/01  15:53:00  af
   35  *              Upgraded to BSD 4.4.
   36  *              [91/09/01            af]
   37  * 
   38  * Revision 2.4.1.1  91/09/01  15:53:00  af
   39  *      Upgraded to BSD 4.4.
   40  *      [91/09/01            af]
   41  * 
   42  * Revision 2.4  91/05/14  17:40:04  mrt
   43  *      Correcting copyright
   44  * 
   45  * Revision 2.3  91/03/16  15:01:35  rpd
   46  *      Fixed the definitions for ANSI C.
   47  *      [91/02/20            rpd]
   48  * 
   49  * Revision 2.2  91/02/14  15:04:02  mrt
   50  *      Changed to new Mach copyright
   51  * 
   52  * 
   53  */
   54 /*
   55  * Format definitions for 'ioctl' commands in device definitions.
   56  *
   57  * From BSD4.4.
   58  */
   59 
   60 #ifndef _SYS_IOCTL_H_
   61 #define _SYS_IOCTL_H_
   62 /*
   63  * Ioctl's have the command encoded in the lower word, and the size of
   64  * any in or out parameters in the upper word.  The high 3 bits of the
   65  * upper word are used to encode the in/out status of the parameter.
   66  */
   67 #define IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
   68 #define IOC_VOID        0x20000000      /* no parameters */
   69 #define IOC_OUT         0x40000000      /* copy out parameters */
   70 #define IOC_IN          0x80000000U     /* copy in parameters */
   71 #define IOC_INOUT       (IOC_IN|IOC_OUT)
   72 
   73 #define _IOC(inout,group,num,len) \
   74         (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
   75 #define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
   76 #define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
   77 #define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
   78 #define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
   79 
   80 #endif   _SYS_IOCTL_H_

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

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sys/sys/ioctl.h