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// +build zos,s390x 7 8// Functions to access/create device major and minor numbers matching the 9// encoding used by z/OS. 10// 11// The information below is extracted and adapted from <sys/stat.h> macros. 12 13package unix 14 15// Major returns the major component of a z/OS device number. 16func Major(dev uint64) uint32 { 17 return uint32((dev >> 16) & 0x0000FFFF) 18} 19 20// Minor returns the minor component of a z/OS device number. 21func Minor(dev uint64) uint32 { 22 return uint32(dev & 0x0000FFFF) 23} 24 25// Mkdev returns a z/OS device number generated from the given major and minor 26// components. 27func Mkdev(major, minor uint32) uint64 { 28 return (uint64(major) << 16) | uint64(minor) 29} 30