// Copyright 2017 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. // Functions to access/create device major and minor numbers matching the // encoding used in NetBSD's sys/types.h header. package unix // Major returns the major component of a NetBSD device number. func Major(dev uint64) uint32 { return uint32((dev & 0x000fff00) >> 8) } // Minor returns the minor component of a NetBSD device number. func Minor(dev uint64) uint32 { minor := uint32((dev & 0x000000ff) >> 0) minor |= uint32((dev & 0xfff00000) >> 12) return minor } // Mkdev returns a NetBSD device number generated from the given major and minor // components. func Mkdev(major, minor uint32) uint64 { dev := (uint64(major) << 8) & 0x000fff00 dev |= (uint64(minor) << 12) & 0xfff00000 dev |= (uint64(minor) << 0) & 0x000000ff return dev }