Method _test_open

Lib/test/_test_eintr.py:338–365

(self, do_open_close_reader, do_open_close_writer)

    @support.requires_freebsd_version(10, 3)
    @unittest.skipUnless(hasattr(os, 'mkfifo'), 'needs mkfifo()')
    def _test_open(self, do_open_close_reader, do_open_close_writer):
        filename = os_helper.TESTFN

        # Use a fifo: until the child opens it for reading, the parent will
        # block when trying to open it for writing.
        os_helper.unlink(filename)
        try:
            os.mkfifo(filename)
        except PermissionError as exc:
            self.skipTest(f'os.mkfifo(): {exc!r}')
        self.addCleanup(os_helper.unlink, filename)

        code = '\n'.join((
            'import os, time',
            '',
            f'path = {filename!a}',
            f'sleep_time = {self.sleep_time!r}',
            '',
            '# let the parent block',
            'time.sleep(sleep_time)',
            '',
            do_open_close_reader,
        ))

        proc = self.subprocess(code)
        with kill_on_error(proc):
            do_open_close_writer(filename)
            self.assertEqual(proc.wait(), 0)

    def python_open(self, path):
        fp = open(path, 'w')