code: def read_with_timeout(
      fd, n, timeout_sec
  ):  # pylint: disable=invalid-name
      """Read data from a file descriptor, with timeout.
  
      This function is intended as a helper function for implementations of ProjectAPIHandler
      read_transport. Tested on Linux and OS X. Not tested on Windows.
  
      Parameters
      ----------
      fd : int
          File descriptor to read from. Must be opened in non-blocking mode (e.g. with O_NONBLOCK)
          if timeout_sec is not None.
  
      n : int
          Maximum number of bytes to read.
  
      timeout_sec : float or None
          If not None, maximum number of seconds to wait before raising IoTimeoutError.
  
      Returns
      -------
      bytes :
          If at least one byte was received before timeout_sec, returns a bytes object with length
          in [1, n]. If timeout_sec is None, returns the equivalent of os.read(fd, n).
  
      Raises
      ------
      IoTimeoutException :
          When timeout_sec is not None and that number of seconds elapses before any data is read.
      """
      end_time = (
          None
          if timeout_sec is None
          else time.monotonic() + timeout_sec
      )
  
      while True:
          _await_nonblocking_ready([fd], [], end_time=end_time)
          try:
              to_return = os.read(fd, n)
              break
          except BlockingIOError:
              pass
  
      # When EOF is reached, close the file.
      if not to_return:
          os.close(fd)
          raise TransportClosedError()
  
      return to_return
  
imports: import abc
  import argparse
  import base64
  import collections
  import enum
  import io
  import json
  import logging
  import os
  import pathlib
  import re
  import select
  import sys
  import time
  import traceback
  import typing
label_desc: Use image node_id 2 for calling a global function with example usage: read_with_timeout(fd, n, timeout_sec) and returns: to_return