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