dev_dragonfly.go
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dev_dragonfly.go
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	// 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)
	}