1 import signal, subprocess, sys, time 2 # On Linux this causes os.waitpid to fail with OSError as the OS has already 3 # reaped our child process. The wait() passing the OSError on to the caller 4 # and causing us to exit with an error is what we are testing against. 5 signal.signal(signal.SIGCHLD, signal.SIG_IGN) 6 subprocess.Popen([sys.executable, '-c', 'print("albatross")']).wait() 7 # Also ensure poll() handles an errno.ECHILD appropriately. 8 p = subprocess.Popen([sys.executable, '-c', 'print("albatross")']) 9 num_polls = 0 10 while p.poll() is None: 11 # Waiting for the process to finish. 12 time.sleep(0.01) # Avoid being a CPU busy loop. 13 num_polls += 1 14 if num_polls > 3000: 15 raise RuntimeError('poll should have returned 0 within 30 seconds') 16
