test_mmap Position of foo: 1.0 pages Length of file: 2.0 pages Contents of byte 0: '\000' Contents of first 3 bytes: '\000\000\000' Modifying file's content... Contents of byte 0: '3' Contents of first 3 bytes: '3\000\000' Contents of second page: foobar Regex match on mmap (page start, length of match): 1.0 6 Test passed