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      1 /****************************************************************************
      2  ****************************************************************************
      3  ***
      4  ***   This header was automatically generated from a Linux kernel header
      5  ***   of the same name, to make information necessary for userspace to
      6  ***   call into the kernel available to libc.  It contains only constants,
      7  ***   structures, and macros generated from the original header, and thus,
      8  ***   contains no copyrightable information.
      9  ***
     10  ****************************************************************************
     11  ****************************************************************************/
     12 #ifndef _ASM_GENERIC_IOCTL_H
     13 #define _ASM_GENERIC_IOCTL_H
     14 
     15 #define _IOC_NRBITS 8
     16 #define _IOC_TYPEBITS 8
     17 #define _IOC_SIZEBITS 14
     18 #define _IOC_DIRBITS 2
     19 
     20 #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
     21 #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
     22 #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
     23 #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
     24 
     25 #define _IOC_NRSHIFT 0
     26 #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
     27 #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
     28 #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
     29 
     30 #define _IOC_NONE 0U
     31 #define _IOC_WRITE 1U
     32 #define _IOC_READ 2U
     33 
     34 #define _IOC(dir,type,nr,size)   (((dir) << _IOC_DIRSHIFT) |   ((type) << _IOC_TYPESHIFT) |   ((nr) << _IOC_NRSHIFT) |   ((size) << _IOC_SIZESHIFT))
     35 
     36 extern unsigned int __invalid_size_argument_for_IOC;
     37 #define _IOC_TYPECHECK(t)   ((sizeof(t) == sizeof(t[1]) &&   sizeof(t) < (1 << _IOC_SIZEBITS)) ?   sizeof(t) : __invalid_size_argument_for_IOC)
     38 
     39 #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
     40 #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
     41 #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
     42 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
     43 #define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
     44 #define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
     45 #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
     46 
     47 #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
     48 #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
     49 #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
     50 #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
     51 
     52 #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
     53 #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
     54 #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
     55 #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
     56 #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
     57 
     58 #endif
     59