1// Copyright 2020 The Go Authors. All rights reserved.
 2// Use of this source code is governed by a BSD-style
 3// license that can be found in the LICENSE file.
 4
 5//go:build zos && s390x
 6
 7// Functions to access/create device major and minor numbers matching the
 8// encoding used by z/OS.
 9//
10// The information below is extracted and adapted from <sys/stat.h> macros.
11
12package unix
13
14// Major returns the major component of a z/OS device number.
15func Major(dev uint64) uint32 {
16	return uint32((dev >> 16) & 0x0000FFFF)
17}
18
19// Minor returns the minor component of a z/OS device number.
20func Minor(dev uint64) uint32 {
21	return uint32(dev & 0x0000FFFF)
22}
23
24// Mkdev returns a z/OS device number generated from the given major and minor
25// components.
26func Mkdev(major, minor uint32) uint64 {
27	return (uint64(major) << 16) | uint64(minor)
28}