dev_zos.go

     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
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