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TOMOYO Linux Cross Reference
Linux/include/uapi/asm-generic/ioctl.h

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  1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2 #ifndef _UAPI_ASM_GENERIC_IOCTL_H
  3 #define _UAPI_ASM_GENERIC_IOCTL_H
  4 
  5 /* ioctl command encoding: 32 bits total, command in lower 16 bits,
  6  * size of the parameter structure in the lower 14 bits of the
  7  * upper 16 bits.
  8  * Encoding the size of the parameter structure in the ioctl request
  9  * is useful for catching programs compiled with old versions
 10  * and to avoid overwriting user space outside the user buffer area.
 11  * The highest 2 bits are reserved for indicating the ``access mode''.
 12  * NOTE: This limits the max parameter size to 16kB -1 !
 13  */
 14 
 15 /*
 16  * The following is for compatibility across the various Linux
 17  * platforms.  The generic ioctl numbering scheme doesn't really enforce
 18  * a type field.  De facto, however, the top 8 bits of the lower 16
 19  * bits are indeed used as a type field, so we might just as well make
 20  * this explicit here.  Please be sure to use the decoding macros
 21  * below from now on.
 22  */
 23 #define _IOC_NRBITS     8
 24 #define _IOC_TYPEBITS   8
 25 
 26 /*
 27  * Let any architecture override either of the following before
 28  * including this file.
 29  */
 30 
 31 #ifndef _IOC_SIZEBITS
 32 # define _IOC_SIZEBITS  14
 33 #endif
 34 
 35 #ifndef _IOC_DIRBITS
 36 # define _IOC_DIRBITS   2
 37 #endif
 38 
 39 #define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)
 40 #define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)
 41 #define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)
 42 #define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)
 43 
 44 #define _IOC_NRSHIFT    0
 45 #define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
 46 #define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
 47 #define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
 48 
 49 /*
 50  * Direction bits, which any architecture can choose to override
 51  * before including this file.
 52  *
 53  * NOTE: _IOC_WRITE means userland is writing and kernel is
 54  * reading. _IOC_READ means userland is reading and kernel is writing.
 55  */
 56 
 57 #ifndef _IOC_NONE
 58 # define _IOC_NONE      0U
 59 #endif
 60 
 61 #ifndef _IOC_WRITE
 62 # define _IOC_WRITE     1U
 63 #endif
 64 
 65 #ifndef _IOC_READ
 66 # define _IOC_READ      2U
 67 #endif
 68 
 69 #define _IOC(dir,type,nr,size) \
 70         (((dir)  << _IOC_DIRSHIFT) | \
 71          ((type) << _IOC_TYPESHIFT) | \
 72          ((nr)   << _IOC_NRSHIFT) | \
 73          ((size) << _IOC_SIZESHIFT))
 74 
 75 #ifndef __KERNEL__
 76 #define _IOC_TYPECHECK(t) (sizeof(t))
 77 #endif
 78 
 79 /*
 80  * Used to create numbers.
 81  *
 82  * NOTE: _IOW means userland is writing and kernel is reading. _IOR
 83  * means userland is reading and kernel is writing.
 84  */
 85 #define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
 86 #define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
 87 #define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
 88 #define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
 89 #define _IOR_BAD(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
 90 #define _IOW_BAD(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
 91 #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
 92 
 93 /* used to decode ioctl numbers.. */
 94 #define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
 95 #define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
 96 #define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
 97 #define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
 98 
 99 /* ...and for the drivers/sound files... */
100 
101 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
102 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
103 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
104 #define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
105 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
106 
107 #endif /* _UAPI_ASM_GENERIC_IOCTL_H */
108 

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