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// 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.

// +build darwin freebsd netbsd openbsd

// Sockets for BSD variants

package net

import (

        "runtime"

        "syscall"

)

func maxListenerBacklog() int {

        var (

                n   uint32

                err error

        )

        switch runtime.GOOS {

        case "darwin", "freebsd":

                n, err = syscall.SysctlUint32("kern.ipc.somaxconn")

        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

        }

        return int(n)

}

func listenerSockaddr(s, f int, la syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (syscall.Sockaddr, error) {

        a := toAddr(la)

        if a == nil {

                return la, nil

        }

        switch v := a.(type) {

        case *UDPAddr:

                if v.IP.IsMulticast() {

                        err := setDefaultMulticastSockopts(s)

                        if err != nil {

                                return nil, err

                        }

                        switch f {

                        case syscall.AF_INET:

                                v.IP = IPv4zero

                        case syscall.AF_INET6:

                                v.IP = IPv6unspecified

                        }

                        return v.sockaddr(f)

                }

        }

        return la, nil

}