53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
// Copyright (C) 2019 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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//go:build !solaris && !windows
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// +build !solaris,!windows
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package dialer
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import (
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"syscall"
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"golang.org/x/sys/unix"
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)
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var SupportsReusePort = false
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func init() {
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fd, err := unix.Socket(unix.AF_INET, unix.SOCK_STREAM, unix.IPPROTO_IP)
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if err != nil {
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l.Debugln("Failed to create a socket", err)
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return
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}
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defer func() { _ = unix.Close(fd) }()
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err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
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switch {
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case err == unix.ENOPROTOOPT || err == unix.EINVAL:
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l.Debugln("SO_REUSEPORT not supported")
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case err != nil:
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l.Debugln("Unknown error when determining SO_REUSEPORT support", err)
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default:
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l.Debugln("SO_REUSEPORT supported")
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SupportsReusePort = true
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}
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}
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func ReusePortControl(_, _ string, c syscall.RawConn) error {
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if !SupportsReusePort {
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return nil
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}
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var opErr error
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err := c.Control(func(fd uintptr) {
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opErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
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})
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if err != nil {
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return err
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}
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return opErr
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}
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