class_docstr: EINTR tests for the os module. 
class_docstr_tok: ["EINTR","tests","for","the","os","module","."]
code: def _test_wait_multiple(self, wait_func):
      num = 3
      processes = [self.new_sleep_process() for _ in range(num)]
      for _ in range(num):
          wait_func()
      # Call the Popen method to avoid a ResourceWarning
      for proc in processes:
          proc.wait()
  
imports: import contextlib
  import faulthandler
  import fcntl
  import os
  import platform
  import select
  import signal
  import socket
  import subprocess
  import sys
  import time
  import unittest
  from test import support
  from test.support import os_helper
  from test.support import socket_helper
label_desc: Use image node_id 2 for calling the OSEINTRTest obj's underlying member method code with example usage: obj._test_wait_multiple(wait_func) without return types