| // 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 NetBSD's sys/types.h header. |
| |
| package unix |
| |
| // Major returns the major component of a NetBSD device number. |
| func Major(dev uint64) uint32 { |
| return uint32((dev & 0x000fff00) >> 8) |
| } |
| |
| // Minor returns the minor component of a NetBSD device number. |
| func Minor(dev uint64) uint32 { |
| minor := uint32((dev & 0x000000ff) >> 0) |
| minor |= uint32((dev & 0xfff00000) >> 12) |
| return minor |
| } |
| |
| // Mkdev returns a NetBSD device number generated from the given major and minor |
| // components. |
| func Mkdev(major, minor uint32) uint64 { |
| dev := (uint64(major) << 8) & 0x000fff00 |
| dev |= (uint64(minor) << 12) & 0xfff00000 |
| dev |= (uint64(minor) << 0) & 0x000000ff |
| return dev |
| } |