| David K. Bainbridge | e05cf0c | 2021-08-19 03:16:50 +0000 | [diff] [blame^] | 1 | // Copyright 2020 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 | //go:build zos && s390x |
| 6 | // +build zos,s390x |
| 7 | |
| 8 | // Functions to access/create device major and minor numbers matching the |
| 9 | // encoding used by z/OS. |
| 10 | // |
| 11 | // The information below is extracted and adapted from <sys/stat.h> macros. |
| 12 | |
| 13 | package unix |
| 14 | |
| 15 | // Major returns the major component of a z/OS device number. |
| 16 | func Major(dev uint64) uint32 { |
| 17 | return uint32((dev >> 16) & 0x0000FFFF) |
| 18 | } |
| 19 | |
| 20 | // Minor returns the minor component of a z/OS device number. |
| 21 | func Minor(dev uint64) uint32 { |
| 22 | return uint32(dev & 0x0000FFFF) |
| 23 | } |
| 24 | |
| 25 | // Mkdev returns a z/OS device number generated from the given major and minor |
| 26 | // components. |
| 27 | func Mkdev(major, minor uint32) uint64 { |
| 28 | return (uint64(major) << 16) | uint64(minor) |
| 29 | } |