You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
1013 B
31 lines
1013 B
7 years ago
|
// 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 FreeBSD's sys/types.h header.
|
||
|
|
//
|
||
|
|
// The information below is extracted and adapted from sys/types.h:
|
||
|
|
//
|
||
|
|
// Minor gives a cookie instead of an index since in order to avoid changing the
|
||
|
|
// meanings of bits 0-15 or wasting time and space shifting bits 16-31 for
|
||
|
|
// devices that don't use them.
|
||
|
|
|
||
|
|
package unix
|
||
|
|
|
||
|
|
// Major returns the major component of a FreeBSD device number.
|
||
|
|
func Major(dev uint64) uint32 {
|
||
|
|
return uint32((dev >> 8) & 0xff)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Minor returns the minor component of a FreeBSD device number.
|
||
|
|
func Minor(dev uint64) uint32 {
|
||
|
|
return uint32(dev & 0xffff00ff)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Mkdev returns a FreeBSD device number generated from the given major and
|
||
|
|
// minor components.
|
||
|
|
func Mkdev(major, minor uint32) uint64 {
|
||
|
|
return (uint64(major) << 8) | uint64(minor)
|
||
|
|
}
|