| from test.test_support import TESTFN, run_unittest |
| import mmap |
| import unittest |
| import os, re |
| |
| PAGESIZE = mmap.PAGESIZE |
| |
| class MmapTests(unittest.TestCase): |
| |
| def setUp(self): |
| if os.path.exists(TESTFN): |
| os.unlink(TESTFN) |
| |
| def tearDown(self): |
| try: |
| os.unlink(TESTFN) |
| except OSError: |
| pass |
| |
| def test_basic(self): |
| # Test mmap module on Unix systems and Windows |
| |
| # Create a file to be mmap'ed. |
| f = open(TESTFN, 'w+') |
| try: |
| # Write 2 pages worth of data to the file |
| f.write('\0'* PAGESIZE) |
| f.write('foo') |
| f.write('\0'* (PAGESIZE-3) ) |
| f.flush() |
| m = mmap.mmap(f.fileno(), 2 * PAGESIZE) |
| f.close() |
| |
| # Simple sanity checks |
| |
| tp = str(type(m)) # SF bug 128713: segfaulted on Linux |
| self.assertEqual(m.find('foo'), PAGESIZE) |
| |
| self.assertEqual(len(m), 2*PAGESIZE) |
| |
| self.assertEqual(m[0], '\0') |
| self.assertEqual(m[0:3], '\0\0\0') |
| |
| # Modify the file's content |
| m[0] = '3' |
| m[PAGESIZE +3: PAGESIZE +3+3] = 'bar' |
| |
| # Check that the modification worked |
| self.assertEqual(m[0], '3') |
| self.assertEqual(m[0:3], '3\0\0') |
| self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], '\0foobar\0') |
| |
| m.flush() |
| |
| # Test doing a regular expression match in an mmap'ed file |
| match = re.search('[A-Za-z]+', m) |
| if match is None: |
| self.fail('regex match on mmap failed!') |
| else: |
| start, end = match.span(0) |
| length = end - start |
| |
| self.assertEqual(start, PAGESIZE) |
| self.assertEqual(end, PAGESIZE + 6) |
| |
| # test seeking around (try to overflow the seek implementation) |
| m.seek(0,0) |
| self.assertEqual(m.tell(), 0) |
| m.seek(42,1) |
| self.assertEqual(m.tell(), 42) |
| m.seek(0,2) |
| self.assertEqual(m.tell(), len(m)) |
| |
| # Try to seek to negative position... |
| self.assertRaises(ValueError, m.seek, -1) |
| |
| # Try to seek beyond end of mmap... |
| self.assertRaises(ValueError, m.seek, 1, 2) |
| |
| # Try to seek to negative position... |
| self.assertRaises(ValueError, m.seek, -len(m)-1, 2) |
| |
| # Try resizing map |
| try: |
| m.resize(512) |
| except SystemError: |
| # resize() not supported |
| # No messages are printed, since the output of this test suite |
| # would then be different across platforms. |
| pass |
| else: |
| # resize() is supported |
| self.assertEqual(len(m), 512) |
| # Check that we can no longer seek beyond the new size. |
| self.assertRaises(ValueError, m.seek, 513, 0) |
| |
| # Check that the underlying file is truncated too |
| # (bug #728515) |
| f = open(TESTFN) |
| f.seek(0, 2) |
| self.assertEqual(f.tell(), 512) |
| f.close() |
| self.assertEqual(m.size(), 512) |
| |
| m.close() |
| |
| finally: |
| try: |
| f.close() |
| except OSError: |
| pass |
| |
| def test_access_parameter(self): |
| # Test for "access" keyword parameter |
| mapsize = 10 |
| open(TESTFN, "wb").write("a"*mapsize) |
| f = open(TESTFN, "rb") |
| m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ) |
| self.assertEqual(m[:], 'a'*mapsize, "Readonly memory map data incorrect.") |
| |
| # Ensuring that readonly mmap can't be slice assigned |
| try: |
| m[:] = 'b'*mapsize |
| except TypeError: |
| pass |
| else: |
| self.fail("Able to write to readonly memory map") |
| |
| # Ensuring that readonly mmap can't be item assigned |
| try: |
| m[0] = 'b' |
| except TypeError: |
| pass |
| else: |
| self.fail("Able to write to readonly memory map") |
| |
| # Ensuring that readonly mmap can't be write() to |
| try: |
| m.seek(0,0) |
| m.write('abc') |
| except TypeError: |
| pass |
| else: |
| self.fail("Able to write to readonly memory map") |
| |
| # Ensuring that readonly mmap can't be write_byte() to |
| try: |
| m.seek(0,0) |
| m.write_byte('d') |
| except TypeError: |
| pass |
| else: |
| self.fail("Able to write to readonly memory map") |
| |
| # Ensuring that readonly mmap can't be resized |
| try: |
| m.resize(2*mapsize) |
| except SystemError: # resize is not universally supported |
| pass |
| except TypeError: |
| pass |
| else: |
| self.fail("Able to resize readonly memory map") |
| del m, f |
| self.assertEqual(open(TESTFN, "rb").read(), 'a'*mapsize, |
| "Readonly memory map data file was modified") |
| |
| # Opening mmap with size too big |
| import sys |
| f = open(TESTFN, "r+b") |
| try: |
| m = mmap.mmap(f.fileno(), mapsize+1) |
| except ValueError: |
| # we do not expect a ValueError on Windows |
| # CAUTION: This also changes the size of the file on disk, and |
| # later tests assume that the length hasn't changed. We need to |
| # repair that. |
| if sys.platform.startswith('win'): |
| self.fail("Opening mmap with size+1 should work on Windows.") |
| else: |
| # we expect a ValueError on Unix, but not on Windows |
| if not sys.platform.startswith('win'): |
| self.fail("Opening mmap with size+1 should raise ValueError.") |
| m.close() |
| f.close() |
| if sys.platform.startswith('win'): |
| # Repair damage from the resizing test. |
| f = open(TESTFN, 'r+b') |
| f.truncate(mapsize) |
| f.close() |
| |
| # Opening mmap with access=ACCESS_WRITE |
| f = open(TESTFN, "r+b") |
| m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE) |
| # Modifying write-through memory map |
| m[:] = 'c'*mapsize |
| self.assertEqual(m[:], 'c'*mapsize, |
| "Write-through memory map memory not updated properly.") |
| m.flush() |
| m.close() |
| f.close() |
| f = open(TESTFN, 'rb') |
| stuff = f.read() |
| f.close() |
| self.assertEqual(stuff, 'c'*mapsize, |
| "Write-through memory map data file not updated properly.") |
| |
| # Opening mmap with access=ACCESS_COPY |
| f = open(TESTFN, "r+b") |
| m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY) |
| # Modifying copy-on-write memory map |
| m[:] = 'd'*mapsize |
| self.assertEqual(m[:], 'd' * mapsize, |
| "Copy-on-write memory map data not written correctly.") |
| m.flush() |
| self.assertEqual(open(TESTFN, "rb").read(), 'c'*mapsize, |
| "Copy-on-write test data file should not be modified.") |
| # Ensuring copy-on-write maps cannot be resized |
| self.assertRaises(TypeError, m.resize, 2*mapsize) |
| del m, f |
| |
| # Ensuring invalid access parameter raises exception |
| f = open(TESTFN, "r+b") |
| self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4) |
| f.close() |
| |
| if os.name == "posix": |
| # Try incompatible flags, prot and access parameters. |
| f = open(TESTFN, "r+b") |
| self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, |
| flags=mmap.MAP_PRIVATE, |
| prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE) |
| f.close() |
| |
| def test_bad_file_desc(self): |
| # Try opening a bad file descriptor... |
| self.assertRaises(mmap.error, mmap.mmap, -2, 4096) |
| |
| def test_tougher_find(self): |
| # Do a tougher .find() test. SF bug 515943 pointed out that, in 2.2, |
| # searching for data with embedded \0 bytes didn't work. |
| f = open(TESTFN, 'w+') |
| |
| data = 'aabaac\x00deef\x00\x00aa\x00' |
| n = len(data) |
| f.write(data) |
| f.flush() |
| m = mmap.mmap(f.fileno(), n) |
| f.close() |
| |
| for start in range(n+1): |
| for finish in range(start, n+1): |
| slice = data[start : finish] |
| self.assertEqual(m.find(slice), data.find(slice)) |
| self.assertEqual(m.find(slice + 'x'), -1) |
| m.close() |
| |
| def test_double_close(self): |
| # make sure a double close doesn't crash on Solaris (Bug# 665913) |
| f = open(TESTFN, 'w+') |
| |
| f.write(2**16 * 'a') # Arbitrary character |
| f.close() |
| |
| f = open(TESTFN) |
| mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ) |
| mf.close() |
| mf.close() |
| f.close() |
| |
| def test_entire_file(self): |
| # test mapping of entire file by passing 0 for map length |
| if hasattr(os, "stat"): |
| f = open(TESTFN, "w+") |
| |
| f.write(2**16 * 'm') # Arbitrary character |
| f.close() |
| |
| f = open(TESTFN, "rb+") |
| mf = mmap.mmap(f.fileno(), 0) |
| self.assertEqual(len(mf), 2**16, "Map size should equal file size.") |
| self.assertEqual(mf.read(2**16), 2**16 * "m") |
| mf.close() |
| f.close() |
| |
| def test_move(self): |
| # make move works everywhere (64-bit format problem earlier) |
| f = open(TESTFN, 'w+') |
| |
| f.write("ABCDEabcde") # Arbitrary character |
| f.flush() |
| |
| mf = mmap.mmap(f.fileno(), 10) |
| mf.move(5, 0, 5) |
| self.assertEqual(mf[:], "ABCDEABCDE", "Map move should have duplicated front 5") |
| mf.close() |
| f.close() |
| |
| def test_anonymous(self): |
| # anonymous mmap.mmap(-1, PAGE) |
| m = mmap.mmap(-1, PAGESIZE) |
| for x in xrange(PAGESIZE): |
| self.assertEqual(m[x], '\0', "anonymously mmap'ed contents should be zero") |
| |
| for x in xrange(PAGESIZE): |
| m[x] = ch = chr(x & 255) |
| self.assertEqual(m[x], ch) |
| |
| def test_main(): |
| run_unittest(MmapTests) |
| |
| if __name__ == '__main__': |
| test_main() |