dev_darwin.go raw

   1  // Copyright 2017 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  // Functions to access/create device major and minor numbers matching the
   6  // encoding used in Darwin's sys/types.h header.
   7  
   8  package unix
   9  
  10  // Major returns the major component of a Darwin device number.
  11  func Major(dev uint64) uint32 {
  12  	return uint32((dev >> 24) & 0xff)
  13  }
  14  
  15  // Minor returns the minor component of a Darwin device number.
  16  func Minor(dev uint64) uint32 {
  17  	return uint32(dev & 0xffffff)
  18  }
  19  
  20  // Mkdev returns a Darwin device number generated from the given major and minor
  21  // components.
  22  func Mkdev(major, minor uint32) uint64 {
  23  	return (uint64(major) << 24) | uint64(minor)
  24  }
  25