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30 lines
850 B
Go
30 lines
850 B
Go
// Copyright 2020 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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//go:build zos && s390x
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// +build zos,s390x
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// Functions to access/create device major and minor numbers matching the
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// encoding used by z/OS.
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//
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// The information below is extracted and adapted from <sys/stat.h> macros.
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package unix
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// Major returns the major component of a z/OS device number.
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func Major(dev uint64) uint32 {
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return uint32((dev >> 16) & 0x0000FFFF)
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}
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// Minor returns the minor component of a z/OS device number.
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func Minor(dev uint64) uint32 {
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return uint32(dev & 0x0000FFFF)
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}
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// Mkdev returns a z/OS 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) << 16) | uint64(minor)
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}
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