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 8 package unix 9 10 // Major returns the major component of a Darwin device number. 11 func Major(dev uint64) uint32 { 12 return uint32((dev >> 24) & 0xff) 13 } 14 15 // Minor returns the minor component of a Darwin device number. 16 func 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. 22 func Mkdev(major, minor uint32) uint64 { 23 return (uint64(major) << 24) | uint64(minor) 24 } 25