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Linux/include/uapi/asm-generic/ioctl.h

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Diff markup

Differences between /include/uapi/asm-generic/ioctl.h (Version linux-4.4.302) and /include/uapi/asm-generic/ioctl.h (Version linux-5.1.21)


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

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