Addrinfo#connect_internal

# File tmp/rubies/ruby-4.1.0-preview1/ext/socket/lib/socket.rb, line 59
def connect_internal(local_addrinfo, timeout=nil) # :yields: socket
  sock = Socket.new(self.pfamily, self.socktype, self.protocol)
  begin
    sock.ipv6only! if self.ipv6?
    sock.bind local_addrinfo if local_addrinfo
    if timeout
      case sock.connect_nonblock(self, exception: false)
      when 0 # success or EISCONN, other errors raise
        break
      when :wait_writable
        sock.wait(CONNECT_EVENTS, timeout) or
          raise Errno::ETIMEDOUT, "user specified timeout for #{self.ip_address}:#{self.ip_port}"
        # Check SO_ERROR instead of relying on the connect_nonblock retry;
        # some kernels (e.g. Darwin 27) answer the retry connect(2) with
        # EISCONN even when the connection has failed.  [Bug #22223]
        err = sock.getsockopt(Socket::SOL_SOCKET, Socket::SO_ERROR).int
        unless err.zero?
          raise SystemCallError.new("connect(2) for #{self.ip_address}:#{self.ip_port}", err)
        end
      end while true
    else
      sock.connect(self)
    end
  rescue Exception
    sock.close
    raise
  end
  if block_given?
    begin
      yield sock
    ensure
      sock.close
    end
  else
    sock
  end
end