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