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1 // Copyright 2017 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 // Functions to access/create device major and minor numbers matching the
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6 // encoding used in Darwin's sys/types.h header.
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7
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8 package unix
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9
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10 // Major returns the major component of a Darwin device number.
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11 func Major(dev uint64) uint32 {
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12 return uint32((dev >> 24) & 0xff)
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13 }
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14
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15 // Minor returns the minor component of a Darwin device number.
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16 func Minor(dev uint64) uint32 {
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17 return uint32(dev & 0xffffff)
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18 }
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19
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20 // Mkdev returns a Darwin device number generated from the given major and minor
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21 // components.
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22 func Mkdev(major, minor uint32) uint64 {
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23 return (uint64(major) << 24) | uint64(minor)
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24 }
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