cubefs

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 Darwin's sys/types.h header.
7

8
package unix
9

10
// Major returns the major component of a Darwin device number.
11
func Major(dev uint64) uint32 {
12
	return uint32((dev >> 24) & 0xff)
13
}
14

15
// Minor returns the minor component of a Darwin device number.
16
func Minor(dev uint64) uint32 {
17
	return uint32(dev & 0xffffff)
18
}
19

20
// Mkdev returns a Darwin device number generated from the given major and minor
21
// components.
22
func Mkdev(major, minor uint32) uint64 {
23
	return (uint64(major) << 24) | uint64(minor)
24
}
25