vendor/golang.org/x/sys/unix/dev_openbsd.go

   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 OpenBSD's sys/types.h header.
   7
   8 package unix
   9
  10 // Major returns the major component of an OpenBSD device number.
  11 func Major(dev uint64) uint32 {
  12         return uint32((dev & 0x0000ff00) >> 8)
  13 }
  14
  15 // Minor returns the minor component of an OpenBSD device number.
  16 func Minor(dev uint64) uint32 {
  17         minor := uint32((dev & 0x000000ff) >> 0)
  18         minor |= uint32((dev & 0xffff0000) >> 8)
  19         return minor
  20 }
  21
  22 // Mkdev returns an OpenBSD device number generated from the given major and minor
  23 // components.
  24 func Mkdev(major, minor uint32) uint64 {
  25         dev := (uint64(major) << 8) & 0x0000ff00
  26         dev |= (uint64(minor) << 8) & 0xffff0000
  27         dev |= (uint64(minor) << 0) & 0x000000ff
  28         return dev
  29 }