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dev_netbsd.go (913B)

      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 NetBSD's sys/types.h header.
      7 
      8 package unix
      9 
     10 // Major returns the major component of a NetBSD device number.
     11 func Major(dev uint64) uint32 {
     12 	return uint32((dev & 0x000fff00) >> 8)
     13 }
     14 
     15 // Minor returns the minor component of a NetBSD device number.
     16 func Minor(dev uint64) uint32 {
     17 	minor := uint32((dev & 0x000000ff) >> 0)
     18 	minor |= uint32((dev & 0xfff00000) >> 12)
     19 	return minor
     20 }
     21 
     22 // Mkdev returns a NetBSD device number generated from the given major and minor
     23 // components.
     24 func Mkdev(major, minor uint32) uint64 {
     25 	dev := (uint64(major) << 8) & 0x000fff00
     26 	dev |= (uint64(minor) << 12) & 0xfff00000
     27 	dev |= (uint64(minor) << 0) & 0x000000ff
     28 	return dev
     29 }