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30 lines
1013 B
30 lines
1013 B
// 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 FreeBSD'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 FreeBSD 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 FreeBSD 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 FreeBSD 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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