src

Go monorepo.
git clone git://code.dwrz.net/src
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dev_zos.go (830B)

      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 }