// Copyright 2020 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

//go:build zos && s390x

// +build zos,s390x

// Functions to access/create device major and minor numbers matching the

// encoding used by z/OS.

//

// The information below is extracted and adapted from <sys/stat.h> macros.

package unix

// Major returns the major component of a z/OS device number.

func Major(dev uint64) uint32 {

	return uint32((dev >> 16) & 0x0000FFFF)

}

// Minor returns the minor component of a z/OS device number.

func Minor(dev uint64) uint32 {

	return uint32(dev & 0x0000FFFF)

}

// Mkdev returns a z/OS device number generated from the given major and minor

// components.

func Mkdev(major, minor uint32) uint64 {

	return (uint64(major) << 16) | uint64(minor)

}