// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build aix || js || solaris || wasip1

package net

import "syscall"

func maxListenerBacklog() int {
	// TODO: Implement this
	// NOTE: Never return a number bigger than 1<<16 - 1. See issue 5030.
	return syscall.SOMAXCONN

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package net

import (
	"internal/syscall/windows"
	"os"
	"syscall"
)

func maxListenerBacklog() int {
	// When the socket backlog is SOMAXCONN, Windows will set the backlog to
	// "a reasonable maximum value".
	// See: https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-listen

// Copyright 2013 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.

package net

func maxListenerBacklog() int {
	// /sys/include/ape/sys/socket.h:/SOMAXCONN
	return 5

// 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":

	size := 16
	if major > 4 || (major == 4 && minor >= 1) {
		size = 32
	}

	var max uint = 1<<size - 1
	if uint(n) > max {
		n = int(max)
	}
	return n
}

func maxListenerBacklog() int {
	fd, err := open("/proc/sys/net/core/somaxconn")
	if err != nil {
		return syscall.SOMAXCONN
	}
	defer fd.close()
	l, ok := fd.readLine()
	if !ok {
		return syscall.SOMAXCONN
	}

	SetWriteDeadline(t time.Time) error
}

var listenerBacklogCache struct {
	sync.Once
	val int
}

// listenerBacklog is a caching wrapper around maxListenerBacklog.
//
// listenerBacklog should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/database64128/tfo-go/v2

	data="os.OpenFile"
String id=158
	data="os.Open"
String id=159
	data="net.open"
String id=160
	data="/usr/local/google/home/mknyszek/work/go-1/src/net/parse.go"
String id=161
	data="net.maxListenerBacklog"
String id=162
	data="/usr/local/google/home/mknyszek/work/go-1/src/net/sock_linux.go"
String id=163
	data="net.listenerBacklog.func1"
String id=164
	data="sync.(*Once).doSlow"
String id=165