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Annotation of OSKit-Mach/include/sys/ioctl.h, revision 1.1

1.1     ! root        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  [email protected]
        !            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:  * Format definitions for 'ioctl' commands in device definitions.
        !            28:  *
        !            29:  * From BSD4.4.
        !            30:  */
        !            31: 
        !            32: #ifndef _MACH_SYS_IOCTL_H_
        !            33: #define _MACH_SYS_IOCTL_H_
        !            34: /*
        !            35:  * Ioctl's have the command encoded in the lower word, and the size of
        !            36:  * any in or out parameters in the upper word.  The high 3 bits of the
        !            37:  * upper word are used to encode the in/out status of the parameter.
        !            38:  */
        !            39: #define        IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
        !            40: #define        IOC_VOID        0x20000000      /* no parameters */
        !            41: #define        IOC_OUT         0x40000000      /* copy out parameters */
        !            42: #define        IOC_IN          0x80000000U     /* copy in parameters */
        !            43: #define        IOC_INOUT       (IOC_IN|IOC_OUT)
        !            44: 
        !            45: #define _IOC(inout,group,num,len) \
        !            46:        (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
        !            47: #define        _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
        !            48: #define        _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
        !            49: #define        _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
        !            50: #define        _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
        !            51: 
        !            52: #endif  /* _MACH_SYS_IOCTL_H_ */

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