// 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 OpenBSD's sys/types.h header. package unix // Major returns the major component of an OpenBSD device number. func Major(dev uint64) uint32 { return uint32((dev & 0x0000ff00) >> 8) } // Minor returns the minor component of an OpenBSD device number. func Minor(dev uint64) uint32 { minor := uint32((dev & 0x000000ff) >> 0) minor |= uint32((dev & 0xffff0000) >> 8) return minor } // Mkdev returns an OpenBSD device number generated from the given major and minor // components. func Mkdev(major, minor uint32) uint64 { dev := (uint64(major) << 8) & 0x0000ff00 dev |= (uint64(minor) << 8) & 0xffff0000 dev |= (uint64(minor) << 0) & 0x000000ff return dev }