github.com/giovannyortegon/go@v0.0.0-20220115155912-8890063f5bdd/src/pkg/mod/golang.org/x/sys@v0.0.0-20210927094055-39ccf1dd6fa6/unix/dev_zos.go (about)

     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  }