examples/bin/verify-default-ports

#!/usr/bin/env perl

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

use strict;
use warnings;
use Socket;

my @ports = (1527, 2181, 8081, 8082, 8083, 8090, 8091, 8200, 9095);

my $tcp = getprotobyname("tcp");
for my $port (@ports) {
  socket(my $sock, PF_INET, SOCK_STREAM, $tcp) or die "socket: $!";
  setsockopt($sock, SOL_SOCKET, SO_REUSEADDR, pack("l", 1)) or die "setsockopt: $!";
  bind($sock, sockaddr_in($port, INADDR_ANY)) or die "Cannot start up because port[$port] is already in use.\n";
  close $sock;
}