38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
// 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.
|
|
|
|
//go:build !js && !plan9 && !windows
|
|
// +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
|
|
}
|