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a07a691ac8
Add Major, Minor and Mkdev functions for converting devices numbers to their major/minor components and vice versa. The functions follow the behavior of the macros defined in Darwin's sys/types.h header. However, the parameter and return types are changed to match the respective Linux implementation of these functions. Test the conversion macros with some well-known static device numbers for devices which should be present on any Darwin system. Updates golang/go#8106 Change-Id: I1862be64684cc1b5a53e15a883819571e368cb2b Reviewed-on: https://go-review.googlesource.com/60610 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
25 lines
739 B
Go
25 lines
739 B
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Functions to access/create device major and minor numbers matching the
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// encoding used in Darwin's sys/types.h header.
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package unix
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// Major returns the major component of a Darwin device number.
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func Major(dev uint64) uint32 {
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return uint32((dev >> 24) & 0xff)
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}
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// Minor returns the minor component of a Darwin device number.
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func Minor(dev uint64) uint32 {
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return uint32(dev & 0xffffff)
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}
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// Mkdev returns a Darwin device number generated from the given major and minor
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// components.
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func Mkdev(major, minor uint32) uint64 {
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return uint64((major << 24) | minor)
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}
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