// 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 Dragonfly's sys/types.h header. // // The information below is extracted and adapted from sys/types.h: // // Minor gives a cookie instead of an index since in order to avoid changing the // meanings of bits 0-15 or wasting time and space shifting bits 16-31 for // devices that don't use them. package unix // Major returns the major component of a DragonFlyBSD device number. func Major(dev uint64) uint32 { return uint32((dev >> 8) & 0xff) } // Minor returns the minor component of a DragonFlyBSD device number. func Minor(dev uint64) uint32 { return uint32(dev & 0xffff00ff) } // Mkdev returns a DragonFlyBSD device number generated from the given major and // minor components. func Mkdev(major, minor uint32) uint64 { return (uint64(major) << 8) | uint64(minor) }