52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
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// Copyright 2019 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package fs
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// These constants, variables and functions are ported from the Linux userland
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// API header ioctl.h (commonly packaged at /usr/include/linux/ioctl.h which
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// includes /usr/include/asm-generic/ioctl.h).
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const (
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iocNrbits uint = 8
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iocTypebits uint = 8
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iocNrshift uint = 0
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iocTypeshift = iocNrshift + iocNrbits
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iocSizeshift = iocTypeshift + iocTypebits
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iocDirshift = iocSizeshift + iocSizebits
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)
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func ioc(dir, typ, nr, size uint) uint {
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return (dir << iocDirshift) |
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(typ << iocTypeshift) |
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(nr << iocNrshift) |
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(size << iocSizeshift)
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}
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// IO defines an ioctl with no parameters. It corresponds to _IO in the Linux
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// userland API.
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func IO(typ, nr uint) uint {
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return ioc(iocNone, typ, nr, 0)
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}
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// IOR defines an ioctl with read (userland perspective) parameters. It
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// corresponds to _IOR in the Linux userland API.
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func IOR(typ, nr, size uint) uint {
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return ioc(iocRead, typ, nr, size)
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}
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// IOW defines an ioctl with write (userland perspective) parameters. It
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// corresponds to _IOW in the Linux userland API.
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func IOW(typ, nr, size uint) uint {
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return ioc(iocWrite, typ, nr, size)
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}
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// IOWR defines an ioctl with both read and write parameters. It corresponds to
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// _IOWR in the Linux userland API.
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func IOWR(typ, nr, size uint) uint {
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return ioc(iocRead|iocWrite, typ, nr, size)
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}
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