| // Copyright 2020 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. |
| |
| //go:build zos && s390x |
| // +build zos,s390x |
| |
| // Functions to access/create device major and minor numbers matching the |
| // encoding used by z/OS. |
| // |
| // The information below is extracted and adapted from <sys/stat.h> macros. |
| |
| package unix |
| |
| // Major returns the major component of a z/OS device number. |
| func Major(dev uint64) uint32 { |
| return uint32((dev >> 16) & 0x0000FFFF) |
| } |
| |
| // Minor returns the minor component of a z/OS device number. |
| func Minor(dev uint64) uint32 { |
| return uint32(dev & 0x0000FFFF) |
| } |
| |
| // Mkdev returns a z/OS device number generated from the given major and minor |
| // components. |
| func Mkdev(major, minor uint32) uint64 { |
| return (uint64(major) << 16) | uint64(minor) |
| } |