text: // 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 FreeBSD'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 FreeBSD device number.
  func Major(dev uint64) uint32 {
  	return uint32((dev >> 8) & 0xff)
  }
  
  // Minor returns the minor component of a FreeBSD device number.
  func Minor(dev uint64) uint32 {
  	return uint32(dev & 0xffff00ff)
  }
  
  // Mkdev returns a FreeBSD device number generated from the given major and
  // minor components.
  func Mkdev(major, minor uint32) uint64 {
  	return (uint64(major) << 8) | uint64(minor)
  }
  