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 7 // Functions to access/create device major and minor numbers matching the 8 // encoding used by z/OS. 9 // 10 // The information below is extracted and adapted from <sys/stat.h> macros. 11 12 package unix 13 14 // Major returns the major component of a z/OS device number. 15 func Major(dev uint64) uint32 { 16 return uint32((dev >> 16) & 0x0000FFFF) 17 } 18 19 // Minor returns the minor component of a z/OS device number. 20 func Minor(dev uint64) uint32 { 21 return uint32(dev & 0x0000FFFF) 22 } 23 24 // Mkdev returns a z/OS device number generated from the given major and minor 25 // components. 26 func Mkdev(major, minor uint32) uint64 { 27 return (uint64(major) << 16) | uint64(minor) 28 } 29