dev_zos.go (850B)
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 }