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Annotation of Gnu-Mach/linux/src/include/asm-i386/ioctl.h, revision 1.1.1.1

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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