mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-27 06:19:23 +01:00
30 lines
913 B
Go
30 lines
913 B
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Functions to access/create device major and minor numbers matching the
|
|
// encoding used in NetBSD's sys/types.h header.
|
|
|
|
package unix
|
|
|
|
// Major returns the major component of a NetBSD device number.
|
|
func Major(dev uint64) uint32 {
|
|
return uint32((dev & 0x000fff00) >> 8)
|
|
}
|
|
|
|
// Minor returns the minor component of a NetBSD device number.
|
|
func Minor(dev uint64) uint32 {
|
|
minor := uint32((dev & 0x000000ff) >> 0)
|
|
minor |= uint32((dev & 0xfff00000) >> 12)
|
|
return minor
|
|
}
|
|
|
|
// Mkdev returns a NetBSD device number generated from the given major and minor
|
|
// components.
|
|
func Mkdev(major, minor uint32) uint64 {
|
|
dev := (uint64(major) << 8) & 0x000fff00
|
|
dev |= (uint64(minor) << 12) & 0xfff00000
|
|
dev |= (uint64(minor) << 0) & 0x000000ff
|
|
return dev
|
|
}
|