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https://github.com/chai2010/advanced-go-programming-book.git
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54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd netbsd openbsd
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package nettest
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import (
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"runtime"
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"strconv"
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"strings"
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"syscall"
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)
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var darwinVersion int
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func init() {
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if runtime.GOOS == "darwin" {
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// See http://support.apple.com/kb/HT1633.
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s, err := syscall.Sysctl("kern.osrelease")
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if err != nil {
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return
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}
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ss := strings.Split(s, ".")
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if len(ss) == 0 {
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return
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}
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darwinVersion, _ = strconv.Atoi(ss[0])
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}
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}
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func supportsIPv6MulticastDeliveryOnLoopback() bool {
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switch runtime.GOOS {
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case "freebsd":
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// See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065.
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// Even after the fix, it looks like the latest
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// kernels don't deliver link-local scoped multicast
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// packets correctly.
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return false
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case "darwin":
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return !causesIPv6Crash()
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default:
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return true
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}
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}
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func causesIPv6Crash() bool {
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// We see some kernel crash when running IPv6 with IP-level
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// options on Darwin kernel version 12 or below.
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// See golang.org/issues/17015.
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return darwinVersion < 13
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}
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