module EtFullSystem

# File lib/et_full_system.rb, line 6
def self.is_port_open?(port, ip: '0.0.0.0')
  s = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
  sa = Socket.sockaddr_in(port, ip)

  begin
    s.connect_nonblock(sa)
  rescue Errno::EINPROGRESS
    if IO.select(nil, [s], nil, 1)
      begin
        s.connect_nonblock(sa)
      rescue Errno::EISCONN
        return true
      rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
        return false
      end
    end
  end

  return false
end

# File lib/et_full_system/os.rb, line 4
def self.os
  @os ||= (
  host_os = RbConfig::CONFIG['host_os']
  case host_os
  when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
    :windows
  when /darwin|mac os/
    :macosx
  when /linux/
    :linux
  when /solaris|bsd/
    :unix
  else
    raise "unknown os: #{host_os.inspect}"
  end
  )
end