Method _make_test_file

Lib/test/test_mmap.py:1234–1249

(self, num_zeroes, tail)

        unlink(TESTFN)

    def _make_test_file(self, num_zeroes, tail):
        if sys.platform[:3] == 'win' or is_apple:
            requires('largefile',
                'test requires %s bytes and a long time to run' % str(0x180000000))
        f = open(TESTFN, 'w+b')
        try:
            f.seek(num_zeroes)
            f.write(tail)
            f.flush()
        except (OSError, OverflowError, ValueError):
            try:
                f.close()
            except (OSError, OverflowError):
                pass
            raise unittest.SkipTest("filesystem does not have largefile support")
        return f

    def test_large_offset(self):
        with self._make_test_file(0x14FFFFFFF, b" ") as f: