func Mkdev(major, minor uint32) uint64 {
	return (uint64(major) << 8) | uint64(minor)
}
Mkdev returns a DragonFlyBSD device number generated from the given major and
minor components.
package unix
func Major(dev uint64) uint32 {
	return uint32((dev >> 8) & 0xff)
}
func Minor(dev uint64) uint32 {
	return uint32(dev & 0xffff00ff)
}