Red Bear OS
ca7a7edbfb
Mesa 26.1.4's DRM UAPI headers include <sys/ioccom.h> as the BSD include path for ioctl command encoding. The basic _IO / _IOR / _IOW / _IOWR macros are already in <sys/ioctl.h> (musl-style via cbindgen), but sys/ioccom.h adds the bitfield widths / masks / shifts / decoders and the IOC_IN / IOC_OUT / IOC_INOUT / IOCSIZE_* macros that DRM and other Linux UAPI consumers require. This header includes <sys/ioctl.h> for the base macros and adds the Linux-style constants as a thin shim. All new symbols are guarded with #ifndef so including both headers is safe and idempotent. This makes the Mesa-side 04-sys-ioccom-stub-header.patch redundant; that patch can be removed from local/patches/mesa/ and the Mesa recipe's patches list.
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
#ifndef _SYS_IOCCOM_H
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#define _SYS_IOCCOM_H
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// Linux-compatible ioctl command encoding constants — supplements the
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// base _IOC / _IO / _IOR / _IOW / _IOWR macros from <sys/ioctl.h> with
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// the bitfield widths, masks, shifts, decoders, and IOC direction
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// macros that Linux UAPI headers (DRM, V4L2, etc.) expect.
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//
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// DRM headers include <sys/ioccom.h> as the BSD-naming path for ioctl
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// command encoding; relibc's <sys/ioctl.h> provides the basic macros
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// but not these constants. This header unifies them so DRM and other
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// Linux UAPI consumers build without a Mesa-side stub.
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#include <sys/ioctl.h>
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#ifndef _IOC_NRBITS
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#define _IOC_NRBITS 8
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#endif
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#ifndef _IOC_TYPEBITS
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#define _IOC_TYPEBITS 8
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#endif
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#ifndef _IOC_SIZEBITS
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#define _IOC_SIZEBITS 14
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#endif
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#ifndef _IOC_DIRBITS
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#define _IOC_DIRBITS 2
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#endif
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#ifndef _IOC_NRMASK
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#define _IOC_NRMASK ((1 << _IOC_NRBITS) - 1)
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#endif
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#ifndef _IOC_TYPEMASK
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#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS) - 1)
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#endif
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#ifndef _IOC_SIZEMASK
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#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS) - 1)
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#endif
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#ifndef _IOC_DIRMASK
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#define _IOC_DIRMASK ((1 << _IOC_DIRBITS) - 1)
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#endif
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#ifndef _IOC_NRSHIFT
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#define _IOC_NRSHIFT 0
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#endif
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#ifndef _IOC_TYPESHIFT
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#define _IOC_TYPESHIFT (_IOC_NRSHIFT + _IOC_NRBITS)
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#endif
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#ifndef _IOC_SIZESHIFT
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#define _IOC_SIZESHIFT (_IOC_TYPESHIFT + _IOC_TYPEBITS)
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#endif
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#ifndef _IOC_DIRSHIFT
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#define _IOC_DIRSHIFT (_IOC_SIZESHIFT + _IOC_SIZEBITS)
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#endif
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// _IOC_TYPECHECK wraps the ioctl size argument in a sizeof() for type
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// safety. The musl/relibc _IOW / _IOR / _IOWR macros already call
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// sizeof internally on the third argument; this macro is provided for
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// callers that compose ioctl numbers directly (e.g. DRM).
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#ifndef _IOC_TYPECHECK
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#define _IOC_TYPECHECK(t) (sizeof(t))
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#endif
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// _IOC_DIR / _IOC_TYPE / _IOC_NR / _IOC_SIZE decode the fields of an
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// ioctl number. Linux UAPI callers use these to inspect ioctls.
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#ifndef _IOC_DIR
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#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
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#endif
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#ifndef _IOC_TYPE
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#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
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#endif
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#ifndef _IOC_NR
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#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
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#endif
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#ifndef _IOC_SIZE
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#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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#endif
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// IOC_IN / IOC_OUT / IOC_INOUT are the values stored in the direction
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// field of an ioctl number when constructing one without _IO / _IOR /
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// _IOW / _IOWR.
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#ifndef IOC_IN
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#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
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#endif
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#ifndef IOC_OUT
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#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
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#endif
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#ifndef IOC_INOUT
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#define IOC_INOUT ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT)
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#endif
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#ifndef IOCSIZE_MASK
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#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
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#endif
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#ifndef IOCSIZE_SHIFT
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#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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#endif
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#endif /* _SYS_IOCCOM_H */ |