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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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3.6 kB · 107 lines
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */#ifndef _UAPI_ASM_GENERIC_IOCTL_H#define _UAPI_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))
#ifndef __KERNEL__#define _IOC_TYPECHECK(t) (sizeof(t))#endif
/* * 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,argtype) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(argtype)))#define _IOW(type,nr,argtype) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(argtype)))#define _IOWR(type,nr,argtype) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(argtype)))#define _IOR_BAD(type,nr,argtype) _IOC(_IOC_READ,(type),(nr),sizeof(argtype))#define _IOW_BAD(type,nr,argtype) _IOC(_IOC_WRITE,(type),(nr),sizeof(argtype))#define _IOWR_BAD(type,nr,argtype) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(argtype))
/* 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 /* _UAPI_ASM_GENERIC_IOCTL_H */