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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
}