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File ioctl.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_GENERIC_IOCTL_H
#define _ASM_GENERIC_IOCTL_H

/* ioctl command encoding: 32 bits total, command in lower 16 bits,
 * size of the parameter structure in the lower 14 bits of the
 * upper 16 bits.
 * Encoding the size of the parameter structure in the ioctl request
 * is useful for catching programs compiled with old versions
 * and to avoid overwriting user space outside the user buffer area.
 * The highest 2 bits are reserved for indicating the ``access mode''.
 * NOTE: This limits the max parameter size to 16kB -1 !
 */

/*
 * The following is for compatibility across the various Linux
 * platforms.  The generic ioctl numbering scheme doesn't really enforce
 * a type field.  De facto, however, the top 8 bits of the lower 16
 * bits are indeed used as a type field, so we might just as well make
 * this explicit here.  Please be sure to use the decoding macros
 * below from now on.
 */
#define _IOC_NRBITS	8
#define _IOC_TYPEBITS	8

/*
 * Let any architecture override either of the following before
 * including this file.
 */

#ifndef _IOC_SIZEBITS
# define _IOC_SIZEBITS	14
#endif

#ifndef _IOC_DIRBITS
# define _IOC_DIRBITS	2
#endif

#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)

#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)

/*
 * Direction bits, which any architecture can choose to override
 * before including this file.
 *
 * NOTE: _IOC_WRITE means userland is writing and kernel is
 * reading. _IOC_READ means userland is reading and kernel is writing.
 */

#ifndef _IOC_NONE
# define _IOC_NONE	0U
#endif

#ifndef _IOC_WRITE
# define _IOC_WRITE	1U
#endif

#ifndef _IOC_READ
# define _IOC_READ	2U
#endif

#define _IOC(dir,type,nr,size) \
	(((dir)  << _IOC_DIRSHIFT) | \
	 ((type) << _IOC_TYPESHIFT) | \
	 ((nr)   << _IOC_NRSHIFT) | \
	 ((size) << _IOC_SIZESHIFT))

#define _IOC_TYPECHECK(t) (sizeof(t))

/*
 * Used to create numbers.
 *
 * NOTE: _IOW means userland is writing and kernel is reading. _IOR
 * means userland is reading and kernel is writing.
 */
#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOR_BAD(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
#define _IOW_BAD(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
#define _IOWR_BAD(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))

/* used to decode ioctl numbers.. */
#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)

/* ...and for the drivers/sound files... */

#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)

#endif /* _ASM_GENERIC_IOCTL_H */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-17 04:34:30
..	DIR	-	drwxr-xr-x	2025-07-17 04:34:30
auxvec.h	text/x-c	218 B	-rw-r--r--	2025-07-16 08:21:05
bitsperlong.h	text/x-c	564 B	-rw-r--r--	2025-07-16 08:21:05
bpf_perf_event.h	text/x-c	238 B	-rw-r--r--	2025-07-16 08:21:05
errno-base.h	text/x-c	1.57 KB	-rw-r--r--	2025-07-16 08:21:05
errno.h	text/x-c	5.52 KB	-rw-r--r--	2025-07-16 08:21:05
fcntl.h	text/x-c	5.3 KB	-rw-r--r--	2025-07-16 08:21:05
hugetlb_encode.h	text/x-c	1.76 KB	-rw-r--r--	2025-07-16 08:21:05
int-l64.h	text/x-c	718 B	-rw-r--r--	2025-07-16 08:21:05
int-ll64.h	text/x-c	864 B	-rw-r--r--	2025-07-16 08:21:05
ioctl.h	text/x-c	3.4 KB	-rw-r--r--	2025-07-16 08:21:05
ioctls.h	text/x-c	3.89 KB	-rw-r--r--	2025-07-16 08:21:05
ipcbuf.h	text/x-c	1003 B	-rw-r--r--	2025-07-16 08:21:05
kvm_para.h	text/plain	96 B	-rw-r--r--	2025-07-16 08:21:05
mman-common.h	text/x-c	3.46 KB	-rw-r--r--	2025-07-16 08:21:05
mman.h	text/x-c	740 B	-rw-r--r--	2025-07-16 08:21:05
msgbuf.h	text/x-c	1.58 KB	-rw-r--r--	2025-07-16 08:21:05
param.h	text/x-c	353 B	-rw-r--r--	2025-07-16 08:21:05
poll.h	text/x-c	878 B	-rw-r--r--	2025-07-16 08:21:05
posix_types.h	text/x-c	2.32 KB	-rw-r--r--	2025-07-16 08:21:05
resource.h	text/x-c	1.83 KB	-rw-r--r--	2025-07-16 08:21:05
sembuf.h	text/x-c	1.51 KB	-rw-r--r--	2025-07-16 08:21:05
setup.h	text/x-c	190 B	-rw-r--r--	2025-07-16 08:21:05
shmbuf.h	text/x-c	1.79 KB	-rw-r--r--	2025-07-16 08:21:05
shmparam.h	text/x-c	231 B	-rw-r--r--	2025-07-16 08:21:05
siginfo.h	text/x-c	12.21 KB	-rw-r--r--	2025-07-16 08:21:05
signal-defs.h	text/x-c	800 B	-rw-r--r--	2025-07-16 08:21:05
signal.h	text/x-c	2.65 KB	-rw-r--r--	2025-07-16 08:21:05
socket.h	text/x-c	2.42 KB	-rw-r--r--	2025-07-16 08:21:05
sockios.h	text/x-c	439 B	-rw-r--r--	2025-07-16 08:21:05
stat.h	text/x-c	2.57 KB	-rw-r--r--	2025-07-16 08:21:05
statfs.h	text/x-c	1.8 KB	-rw-r--r--	2025-07-16 08:21:05
swab.h	text/x-c	502 B	-rw-r--r--	2025-07-16 08:21:05
termbits.h	text/x-c	4.61 KB	-rw-r--r--	2025-07-16 08:21:05
termios.h	text/x-c	1.34 KB	-rw-r--r--	2025-07-16 08:21:05
types.h	text/x-c	233 B	-rw-r--r--	2025-07-16 08:21:05
ucontext.h	text/x-c	357 B	-rw-r--r--	2025-07-16 08:21:05
unistd.h	text/x-c	27.52 KB	-rw-r--r--	2025-07-16 08:21:05

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