** Copyright (C) 2001-2025 Zabbix SIA
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
func Listen(address string, args ...interface{}) (c *Listener, err error) {
var tlsconfig *tls.Config
if tlsconfig, ok = args[0].(*tls.Config); !ok {
return nil, fmt.Errorf("invalid TLS configuration parameter of type %T", args[0])
// prevent other processes from binding to the same port
// SO_EXCLUSIVEADDRUSE is mutually exclusive with SO_REUSEADDR
// on Windows SO_REUSEADDR has different semantics than on Unix
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms740621(v=vs.85).aspx
Control: func(network, address string, conn syscall.RawConn) error {
if err := conn.Control(func(fd uintptr) {
operr = syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, ^syscall.SO_REUSEADDR, 1)
l, tmperr := lc.Listen(context.Background(), "tcp", address)
return nil, fmt.Errorf("Listen failed: %s", tmperr.Error())
c = &Listener{listener: l.(*net.TCPListener), tlsconfig: tlsconfig}