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// Copyright 2011 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.

// Socket options for Linux

package net

import (

        "os"

        "syscall"

)

func setDefaultSockopts(s, f, t int) error {

        switch f {

        case syscall.AF_INET6:

                // Allow both IP versions even if the OS default is otherwise.

                // Note that some operating systems never admit this option.

                syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)

        }

        if f == syscall.AF_UNIX ||

                (f == syscall.AF_INET || f == syscall.AF_INET6) && t == syscall.SOCK_STREAM {

                // Allow reuse of recently-used addresses.

                err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)

                if err != nil {

                        return os.NewSyscallError("setsockopt", err)

                }

        }

        // Allow broadcast.

        err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)

        if err != nil {

                return os.NewSyscallError("setsockopt", err)

        }

        return nil

}

func setDefaultMulticastSockopts(s int) error {

        // Allow multicast UDP and raw IP datagram sockets to listen

        // concurrently across multiple listeners.

        err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)

        if err != nil {

                return os.NewSyscallError("setsockopt", err)

        }

        return nil

}