1 // Copyright 2017 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.
5 // Functions to access/create device major and minor numbers matching the
6 // encoding used in Darwin's sys/types.h header.
10 // Major returns the major component of a Darwin device number.
11 func Major(dev uint64) uint32 {
12 return uint32((dev >> 24) & 0xff)
15 // Minor returns the minor component of a Darwin device number.
16 func Minor(dev uint64) uint32 {
17 return uint32(dev & 0xffffff)
20 // Mkdev returns a Darwin device number generated from the given major and minor
22 func Mkdev(major, minor uint32) uint64 {
23 return (uint64(major) << 24) | uint64(minor)