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1 // Copyright 2020 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 //go:build zos && s390x
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6 // +build zos,s390x
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7
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8 // Functions to access/create device major and minor numbers matching the
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9 // encoding used by z/OS.
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10 //
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11 // The information below is extracted and adapted from <sys/stat.h> macros.
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12
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13 package unix
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14
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15 // Major returns the major component of a z/OS device number.
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16 func Major(dev uint64) uint32 {
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17 return uint32((dev >> 16) & 0x0000FFFF)
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18 }
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19
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20 // Minor returns the minor component of a z/OS device number.
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21 func Minor(dev uint64) uint32 {
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22 return uint32(dev & 0x0000FFFF)
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23 }
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24
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25 // Mkdev returns a z/OS device number generated from the given major and minor
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26 // components.
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27 func Mkdev(major, minor uint32) uint64 {
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28 return (uint64(major) << 16) | uint64(minor)
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29 }
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