Method test_process_awareness

Lib/test/test_tempfile.py:195–220

(self)

    @support.requires_fork()
    def test_process_awareness(self):
        # ensure that the random source differs between
        # child and parent.
        read_fd, write_fd = os.pipe()
        pid = None
        try:
            pid = os.fork()
            if not pid:
                # child process
                os.close(read_fd)
                os.write(write_fd, next(self.r).encode("ascii"))
                os.close(write_fd)
                # bypass the normal exit handlers- leave those to
                # the parent.
                os._exit(0)

            # parent process
            parent_value = next(self.r)
            child_value = os.read(read_fd, len(parent_value)).decode("ascii")
        finally:
            if pid:
                support.wait_process(pid, exitcode=0)

            os.close(read_fd)
            os.close(write_fd)
        self.assertNotEqual(child_value, parent_value)