pingport.rb

pingport.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'socket'

ARGV.size == 2 or abort "usage: #$0 hostname port"

host, port = ARGV
sec = 1

addr = Addrinfo.tcp(host, port)
puts "trying #{addr.inspect_sockaddr}"
s = Socket.new(addr.afamily, addr.socktype)
begin
  s.connect_nonblock addr
rescue IO::WaitWritable
  IO.select(nil, [s], nil, sec) or abort "TIMEOUT"
end
puts "OPEN"