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# 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.
#
{.deadCodeElim: on.}
const
IOC_NRBITS* = 8
IOC_TYPEBITS* = 8
#
# Let any architecture override either of the following before
# including this file.
#
const
IOC_SIZEBITS* = 14
IOC_DIRBITS* = 2
const
IOC_NRMASK* = ((1 shl IOC_NRBITS) - 1)
IOC_TYPEMASK* = ((1 shl IOC_TYPEBITS) - 1)
IOC_SIZEMASK* = ((1 shl IOC_SIZEBITS) - 1)
IOC_DIRMASK* = ((1 shl IOC_DIRBITS) - 1)
IOC_NRSHIFT* = 0
IOC_TYPESHIFT* = (IOC_NRSHIFT + IOC_NRBITS)
IOC_SIZESHIFT* = (IOC_TYPESHIFT + IOC_TYPEBITS)
IOC_DIRSHIFT* = (IOC_SIZESHIFT + IOC_SIZEBITS)
#
# Direction bits, which any architecture can choose to override
# before including this file.
#
const
IOC_NONE* = 0
IOC_WRITE* = 1
IOC_READ* = 2
template IOC_TYPECHECK*(t: expr): expr =
(sizeof((t)))
# used to create numbers
template IO*(`type`, nr: expr): expr =
(((IOC_NONE) shl IOC_DIRSHIFT) or (((`type`)) shl IOC_TYPESHIFT) or
(((nr)) shl IOC_NRSHIFT) or ((0) shl IOC_SIZESHIFT))
template IOR*(`type`, nr, size: expr): expr =
(((IOC_READ) shl IOC_DIRSHIFT) or (((`type`)) shl IOC_TYPESHIFT) or
(((nr)) shl IOC_NRSHIFT) or (((IOC_TYPECHECK(size))) shl IOC_SIZESHIFT))
template IOW*(`type`, nr, size: expr): expr =
(((IOC_WRITE) shl IOC_DIRSHIFT) or (((`type`)) shl IOC_TYPESHIFT) or
(((nr)) shl IOC_NRSHIFT) or (((IOC_TYPECHECK(size))) shl IOC_SIZESHIFT))
template IOWR*(`type`, nr, size: expr): expr =
(((IOC_READ or IOC_WRITE) shl IOC_DIRSHIFT) or
(((`type`)) shl IOC_TYPESHIFT) or (((nr)) shl IOC_NRSHIFT) or
(((IOC_TYPECHECK(size))) shl IOC_SIZESHIFT))
template IOR_BAD*(`type`, nr, size: expr): expr =
(((IOC_READ) shl IOC_DIRSHIFT) or (((`type`)) shl IOC_TYPESHIFT) or
(((nr)) shl IOC_NRSHIFT) or ((sizeof((size))) shl IOC_SIZESHIFT))
template IOW_BAD*(`type`, nr, size: expr): expr =
(((IOC_WRITE) shl IOC_DIRSHIFT) or (((`type`)) shl IOC_TYPESHIFT) or
(((nr)) shl IOC_NRSHIFT) or ((sizeof((size))) shl IOC_SIZESHIFT))
template IOWR_BAD*(`type`, nr, size: expr): expr =
(((IOC_READ or IOC_WRITE) shl IOC_DIRSHIFT) or
(((`type`)) shl IOC_TYPESHIFT) or (((nr)) shl IOC_NRSHIFT) or
((sizeof((size))) shl IOC_SIZESHIFT))
# used to decode ioctl numbers..
template IOC_DIR*(nr: expr): expr =
(((nr) shr IOC_DIRSHIFT) and IOC_DIRMASK)
template IOC_TYPE*(nr: expr): expr =
(((nr) shr IOC_TYPESHIFT) and IOC_TYPEMASK)
template IOC_NR*(nr: expr): expr =
(((nr) shr IOC_NRSHIFT) and IOC_NRMASK)
template IOC_SIZE*(nr: expr): expr =
(((nr) shr IOC_SIZESHIFT) and IOC_SIZEMASK)
# ...and for the drivers/sound files...
const
IOC_IN* = (IOC_WRITE shl IOC_DIRSHIFT)
IOC_OUT* = (IOC_READ shl IOC_DIRSHIFT)
IOC_INOUT* = ((IOC_WRITE or IOC_READ) shl IOC_DIRSHIFT)
IOCSIZE_MASK_S* = (IOC_SIZEMASK shl IOC_SIZESHIFT)
IOCSIZE_SHIFT_S* = (IOC_SIZESHIFT)
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