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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 | } |