go dev_darwin 源码
golang dev_darwin 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/dev_darwin.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 Darwin's sys/types.h header.
package unix
// Major returns the major component of a Darwin device number.
func Major(dev uint64) uint32 {
return uint32((dev >> 24) & 0xff)
}
// Minor returns the minor component of a Darwin device number.
func Minor(dev uint64) uint32 {
return uint32(dev & 0xffffff)
}
// Mkdev returns a Darwin device number generated from the given major and minor
// components.
func Mkdev(major, minor uint32) uint64 {
return (uint64(major) << 24) | uint64(minor)
}
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