ioctl.h File Reference

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Macros
#define	_IOC_NRBITS   8
#define	_IOC_TYPEBITS   8
#define	_IOC_SIZEBITS   14
#define	_IOC_DIRBITS   2
#define	_IOC_NRSHIFT   0
#define	_IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)
#define	_IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)
#define	_IOC_DIRSHIFT   (_IOC_SIZESHIFT + _IOC_SIZEBITS)
#define	_IOC_NONE   0U
#define	_IOC_WRITE   1U
#define	_IOC_READ   2U
#define	_IOC(dir, type, nr, size)
#define	_IO(type, nr)   _IOC(_IOC_NONE, (type), (nr), 0)
#define	_IOR(type, nr, size)   _IOC(_IOC_READ, (type), (nr), sizeof(size))
#define	_IOW(type, nr, size)   _IOC(_IOC_WRITE, (type), (nr), sizeof(size))
#define	_IOWR(type, nr, size)   _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), sizeof(size))
#define	_IOC_DIR(nr)   (((nr) >> _IOC_DIRSHIFT) & ((1 << _IOC_DIRBITS) - 1))
#define	_IOC_TYPE(nr)   (((nr) >> _IOC_TYPESHIFT) & ((1 << _IOC_TYPEBITS) - 1))
#define	_IOC_NR(nr)   (((nr) >> _IOC_NRSHIFT) & ((1 << _IOC_NRBITS) - 1))
#define	_IOC_SIZE(nr)   (((nr) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1))

Macro Definition Documentation

_IO

#define _IO	(		type,
			nr
	)		_IOC(_IOC_NONE, (type), (nr), 0)

_IOC

#define _IOC	(		dir,
			type,
			nr,
			size
	)

Value:

    (((dir)  << _IOC_DIRSHIFT) |                    \
     ((type) << _IOC_TYPESHIFT) |                   \
     ((nr)   << _IOC_NRSHIFT) |                 \
     ((size) << _IOC_SIZESHIFT))

_IOC_DIR

#define _IOC_DIR

(

nr

)

(((nr) >> _IOC_DIRSHIFT) & ((1 << _IOC_DIRBITS) - 1))

_IOC_DIRBITS

#define _IOC_DIRBITS   2

_IOC_DIRSHIFT

#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT + _IOC_SIZEBITS)

_IOC_NONE

#define _IOC_NONE   0U

_IOC_NR

#define _IOC_NR

(

nr

)

(((nr) >> _IOC_NRSHIFT) & ((1 << _IOC_NRBITS) - 1))

_IOC_NRBITS

#define _IOC_NRBITS   8

_IOC_NRSHIFT

#define _IOC_NRSHIFT   0

_IOC_READ

#define _IOC_READ   2U

_IOC_SIZE

#define _IOC_SIZE

(

nr

)

(((nr) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1))

_IOC_SIZEBITS

#define _IOC_SIZEBITS   14

_IOC_SIZESHIFT

#define _IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)

_IOC_TYPE

#define _IOC_TYPE

(

nr

)

(((nr) >> _IOC_TYPESHIFT) & ((1 << _IOC_TYPEBITS) - 1))

_IOC_TYPEBITS

#define _IOC_TYPEBITS   8

_IOC_TYPESHIFT

#define _IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)

_IOC_WRITE

#define _IOC_WRITE   1U

_IOR

#define _IOR	(		type,
			nr,
			size
	)		_IOC(_IOC_READ, (type), (nr), sizeof(size))

_IOW

#define _IOW	(		type,
			nr,
			size
	)		_IOC(_IOC_WRITE, (type), (nr), sizeof(size))

_IOWR

#define _IOWR	(		type,
			nr,
			size
	)		_IOC(_IOC_READ | _IOC_WRITE, (type), (nr), sizeof(size))