Method open_fds

Lib/test/test_subprocess.py:1539–1542

()

        # Issue #18851
        fds = []
        def open_fds():
            for i in range(20):
                fds.extend(os.pipe())
                time.sleep(0.001)
        t = threading.Thread(target=open_fds)
        t.start()
        try: