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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.

// +build darwin freebsd netbsd openbsd

// Socket options for BSD variants

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 reuse of recently-used ports.
                // This option is supported only in descendants of 4.4BSD,
                // to make an effective multicast application and an application
                // that requires quick draw possible.
                err = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 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)
        }
        err = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}