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Annotation of Gnu-Mach/linux/src/include/asm-i386/ioctl.h, revision 1.1

1.1     ! root        1: /* $Id: ioctl.h,v 1.1 1999/04/26 05:55:47 tb Exp $
        !             2:  *
        !             3:  * linux/ioctl.h for Linux by H.H. Bergman.
        !             4:  */
        !             5: 
        !             6: #ifndef _ASMI386_IOCTL_H
        !             7: #define _ASMI386_IOCTL_H
        !             8: 
        !             9: /* ioctl command encoding: 32 bits total, command in lower 16 bits,
        !            10:  * size of the parameter structure in the lower 14 bits of the
        !            11:  * upper 16 bits.
        !            12:  * Encoding the size of the parameter structure in the ioctl request
        !            13:  * is useful for catching programs compiled with old versions
        !            14:  * and to avoid overwriting user space outside the user buffer area.
        !            15:  * The highest 2 bits are reserved for indicating the ``access mode''.
        !            16:  * NOTE: This limits the max parameter size to 16kB -1 !
        !            17:  */
        !            18: 
        !            19: /*
        !            20:  * The following is for compatibility across the various Linux
        !            21:  * platforms.  The i386 ioctl numbering scheme doesn't really enforce
        !            22:  * a type field.  De facto, however, the top 8 bits of the lower 16
        !            23:  * bits are indeed used as a type field, so we might just as well make
        !            24:  * this explicit here.  Please be sure to use the decoding macros
        !            25:  * below from now on.
        !            26:  */
        !            27: #define _IOC_NRBITS    8
        !            28: #define _IOC_TYPEBITS  8
        !            29: #define _IOC_SIZEBITS  14
        !            30: #define _IOC_DIRBITS   2
        !            31: 
        !            32: #define _IOC_NRMASK    ((1 << _IOC_NRBITS)-1)
        !            33: #define _IOC_TYPEMASK  ((1 << _IOC_TYPEBITS)-1)
        !            34: #define _IOC_SIZEMASK  ((1 << _IOC_SIZEBITS)-1)
        !            35: #define _IOC_DIRMASK   ((1 << _IOC_DIRBITS)-1)
        !            36: 
        !            37: #define _IOC_NRSHIFT   0
        !            38: #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
        !            39: #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
        !            40: #define _IOC_DIRSHIFT  (_IOC_SIZESHIFT+_IOC_SIZEBITS)
        !            41: 
        !            42: /*
        !            43:  * Direction bits.
        !            44:  */
        !            45: #define _IOC_NONE      0U
        !            46: #define _IOC_WRITE     1U
        !            47: #define _IOC_READ      2U
        !            48: 
        !            49: #define _IOC(dir,type,nr,size) \
        !            50:        (((dir)  << _IOC_DIRSHIFT) | \
        !            51:         ((type) << _IOC_TYPESHIFT) | \
        !            52:         ((nr)   << _IOC_NRSHIFT) | \
        !            53:         ((size) << _IOC_SIZESHIFT))
        !            54: 
        !            55: /* used to create numbers */
        !            56: #define _IO(type,nr)           _IOC(_IOC_NONE,(type),(nr),0)
        !            57: #define _IOR(type,nr,size)     _IOC(_IOC_READ,(type),(nr),sizeof(size))
        !            58: #define _IOW(type,nr,size)     _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
        !            59: #define _IOWR(type,nr,size)    _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
        !            60: 
        !            61: /* used to decode ioctl numbers.. */
        !            62: #define _IOC_DIR(nr)           (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
        !            63: #define _IOC_TYPE(nr)          (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
        !            64: #define _IOC_NR(nr)            (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
        !            65: #define _IOC_SIZE(nr)          (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
        !            66: 
        !            67: /* ...and for the drivers/sound files... */
        !            68: 
        !            69: #define IOC_IN         (_IOC_WRITE << _IOC_DIRSHIFT)
        !            70: #define IOC_OUT                (_IOC_READ << _IOC_DIRSHIFT)
        !            71: #define IOC_INOUT      ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
        !            72: #define IOCSIZE_MASK   (_IOC_SIZEMASK << _IOC_SIZESHIFT)
        !            73: #define IOCSIZE_SHIFT  (_IOC_SIZESHIFT)
        !            74: 
        !            75: #endif /* _ASMI386_IOCTL_H */

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