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804a9fee62
Follow CL 63090 and change the Makedev function on Darwin and *BSD to convert to uint64 before shifting/masking. This avoids a potential overflow. Change-Id: I5b566329695cc5edcf82f0ff2366033011b0625b Reviewed-on: https://go-review.googlesource.com/63112 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
31 lines
1.0 KiB
Go
31 lines
1.0 KiB
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 Dragonfly's sys/types.h header.
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//
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// The information below is extracted and adapted from sys/types.h:
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//
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// Minor gives a cookie instead of an index since in order to avoid changing the
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// meanings of bits 0-15 or wasting time and space shifting bits 16-31 for
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// devices that don't use them.
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package unix
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// Major returns the major component of a DragonFlyBSD device number.
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func Major(dev uint64) uint32 {
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return uint32((dev >> 8) & 0xff)
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}
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// Minor returns the minor component of a DragonFlyBSD device number.
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func Minor(dev uint64) uint32 {
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return uint32(dev & 0xffff00ff)
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}
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// Mkdev returns a DragonFlyBSD device number generated from the given major and
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// minor components.
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func Mkdev(major, minor uint32) uint64 {
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return (uint64(major) << 8) | uint64(minor)
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}
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