// Copyright 2009 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 net
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import (
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"runtime"
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"syscall"
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)
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func maxListenerBacklog() int {
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var (
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n uint32
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err error
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)
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switch runtime.GOOS {
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case "darwin":
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n, err = syscall.SysctlUint32("kern.ipc.somaxconn")
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case "freebsd":
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n, err = syscall.SysctlUint32("kern.ipc.soacceptqueue")
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case "netbsd":
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// NOTE: NetBSD has no somaxconn-like kernel state so far
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case "openbsd":
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n, err = syscall.SysctlUint32("kern.somaxconn")
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}
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if n == 0 || err != nil {
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return syscall.SOMAXCONN
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}
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// FreeBSD stores the backlog in a uint16, as does Linux.
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// Assume the other BSDs do too. Truncate number to avoid wrapping.
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// See issue 5030.
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if n > 1<<16-1 {
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n = 1<<16 - 1
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}
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return int(n)
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}
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