0a20b6aef3
Make sure that ioctl() headers in options/linux have the same structure as in the Linux kernel.
53 lines
2.1 KiB
C
53 lines
2.1 KiB
C
#ifndef _ASM_IOCTL_H
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#define _ASM_IOCTL_H
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// ----------------------------------------------------------------------------
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// Linux-like macros to generate ioctls.
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// This section of the file is adapted from the Linux kernel.
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// ----------------------------------------------------------------------------
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#define _IOC_NRBITS 8
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#define _IOC_TYPEBITS 8
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#define _IOC_SIZEBITS 14
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#define _IOC_DIRBITS 2
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#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
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#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
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#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
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#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
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#define _IOC_NRSHIFT 0
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#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
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#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
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#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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#define _IOC_NONE 0U
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#define _IOC_WRITE 1U
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#define _IOC_READ 2U
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#define _IOC(dir, type, num, size) (((dir) << _IOC_DIRSHIFT) | ((type) << _IOC_TYPESHIFT) \
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| ((num) << _IOC_NRSHIFT) | ((size) << _IOC_SIZESHIFT))
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// Linux enfores that the t parameter of _IO{R,W,WR} is actually a type.
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// It does not perform this check for _IO{R,W_WR}_BAD.
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#define _IO(type, num) _IOC(_IOC_NONE, (type), (num), 0)
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#define _IOR(type, num, t) _IOC(_IOC_READ, (type), (num), sizeof(t))
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#define _IOW(type, num, t) _IOC(_IOC_WRITE, (type), (num), sizeof(t))
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#define _IOWR(type, num, t) _IOC(_IOC_READ | _IOC_WRITE, (type), (num), sizeof(t))
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#define _IOR_BAD(type, num, t) _IOC(_IOC_READ, (type), (num), sizeof(t))
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#define _IOW_BAD(type, num, t) _IOC(_IOC_WRITE, (type), (num), sizeof(t))
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#define _IOWR_BAD(type, num, t) _IOC(_IOC_READ | _IOC_WRITE, (type), (num), sizeof(t))
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#define _IOC_DIR(req) (((req) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
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#define _IOC_TYPE(req) (((req) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
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#define _IOC_NR(req) (((req) >> _IOC_NRSHIFT) & _IOC_NRMASK)
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#define _IOC_SIZE(req) (((req) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
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#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
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#define IOC_INOUT ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT)
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#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
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#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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#endif // _ASM_IOCTL_H
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