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// Copyright 2020 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 !js,!plan9,!windows
package agent
import (
"syscall"
"golang.org/x/sys/unix"
)
// setsockoptReuseAddrAndPort sets the SO_REUSEADDR and SO_REUSEPORT socket
// options on c's underlying socket in order to increase the chance to re-bind()
// to the same address and port upon agent restart.
func setsockoptReuseAddrAndPort(network, address string, c syscall.RawConn) error {
var soerr error
if err := c.Control(func(su uintptr) {
sock := int(su)
// Allow reuse of recently-used addresses. This socket option is
// set by default on listeners in Go's net package, see
// net.setDefaultSockopts.
soerr = unix.SetsockoptInt(sock, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
if soerr != nil {
return
}
// Allow reuse of recently-used ports. This gives the agent a
// better chance to re-bind upon restarts.
soerr = unix.SetsockoptInt(sock, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
}); err != nil {
return err
}
return soerr
}
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