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. 4 5// Functions to access/create device major and minor numbers matching the 6// encoding used in Darwin's sys/types.h header. 7 8package unix 9 10// Major returns the major component of a Darwin device number. 11func Major(dev uint64) uint32 { 12 return uint32((dev >> 24) & 0xff) 13} 14 15// Minor returns the minor component of a Darwin device number. 16func Minor(dev uint64) uint32 { 17 return uint32(dev & 0xffffff) 18} 19 20// Mkdev returns a Darwin device number generated from the given major and minor 21// components. 22func Mkdev(major, minor uint32) uint64 { 23 return (uint64(major) << 24) | uint64(minor) 24} 25