Source file src/cmd/vendor/golang.org/x/sys/unix/dev_openbsd.go

     1	// Copyright 2017 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	// Functions to access/create device major and minor numbers matching the
     6	// encoding used in OpenBSD's sys/types.h header.
     7	
     8	package unix
     9	
    10	// Major returns the major component of an OpenBSD device number.
    11	func Major(dev uint64) uint32 {
    12		return uint32((dev & 0x0000ff00) >> 8)
    13	}
    14	
    15	// Minor returns the minor component of an OpenBSD device number.
    16	func Minor(dev uint64) uint32 {
    17		minor := uint32((dev & 0x000000ff) >> 0)
    18		minor |= uint32((dev & 0xffff0000) >> 8)
    19		return minor
    20	}
    21	
    22	// Mkdev returns an OpenBSD device number generated from the given major and minor
    23	// components.
    24	func Mkdev(major, minor uint32) uint64 {
    25		dev := (uint64(major) << 8) & 0x0000ff00
    26		dev |= (uint64(minor) << 8) & 0xffff0000
    27		dev |= (uint64(minor) << 0) & 0x000000ff
    28		return dev
    29	}
    30	

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