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38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build !js && !plan9 && !windows
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// +build !js,!plan9,!windows
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package agent
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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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// setsockoptReuseAddrAndPort sets the SO_REUSEADDR and SO_REUSEPORT socket
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// options on c's underlying socket in order to increase the chance to re-bind()
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// to the same address and port upon agent restart.
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func setsockoptReuseAddrAndPort(network, address string, c syscall.RawConn) error {
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var soerr error
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if err := c.Control(func(su uintptr) {
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sock := int(su)
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// Allow reuse of recently-used addresses. This socket option is
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// set by default on listeners in Go's net package, see
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// net.setDefaultSockopts.
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soerr = unix.SetsockoptInt(sock, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
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if soerr != nil {
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return
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}
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// Allow reuse of recently-used ports. This gives the agent a
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// better chance to re-bind upon restarts.
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soerr = unix.SetsockoptInt(sock, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
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}); err != nil {
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return err
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}
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return soerr
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}
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