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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 Windows

package net

import (
        "os"
        "syscall"
)

func setDefaultSockopts(s syscall.Handle, 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)
        }

        // Windows will reuse recently-used addresses by default.
        // SO_REUSEADDR should not be used here, as it allows
        // a socket to forcibly bind to a port in use by another socket.
        // This could lead to a non-deterministic behavior, where
        // connection requests over the port cannot be guaranteed
        // to be handled by the correct socket.

        // Allow broadcast.
        syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
        return nil
}

func setDefaultMulticastSockopts(s syscall.Handle) 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
}