golang dev_dragonfly 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/dev_dragonfly.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 Dragonfly'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 DragonFlyBSD device number.
func Major(dev uint64) uint32 {
return uint32((dev >> 8) & 0xff)
}
/ Minor returns the minor component of a DragonFlyBSD device number.
func Minor(dev uint64) uint32 {
return uint32(dev & 0xffff00ff)
}
/ Mkdev returns a DragonFlyBSD device number generated from the given major and
/ minor components.
func Mkdev(major, minor uint32) uint64 {
return (uint64(major) << 8) | uint64(minor)
}