Source file src/net/sock_bsd.go

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build darwin dragonfly freebsd netbsd openbsd
     6	
     7	package net
     8	
     9	import (
    10		"runtime"
    11		"syscall"
    12	)
    13	
    14	func maxListenerBacklog() int {
    15		var (
    16			n   uint32
    17			err error
    18		)
    19		switch runtime.GOOS {
    20		case "darwin":
    21			n, err = syscall.SysctlUint32("kern.ipc.somaxconn")
    22		case "freebsd":
    23			n, err = syscall.SysctlUint32("kern.ipc.soacceptqueue")
    24		case "netbsd":
    25			// NOTE: NetBSD has no somaxconn-like kernel state so far
    26		case "openbsd":
    27			n, err = syscall.SysctlUint32("kern.somaxconn")
    28		}
    29		if n == 0 || err != nil {
    30			return syscall.SOMAXCONN
    31		}
    32		// FreeBSD stores the backlog in a uint16, as does Linux.
    33		// Assume the other BSDs do too. Truncate number to avoid wrapping.
    34		// See issue 5030.
    35		if n > 1<<16-1 {
    36			n = 1<<16 - 1
    37		}
    38		return int(n)
    39	}
    40	

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