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, 'bw+') try: # Write 2 pages worth of data to the file f.write(b'\0'* PAGESIZE) f.write(b'foo') f.write(b'\0'* (PAGESIZE-3) ) f.flush() m = mmap.mmap(f.fileno(), 2 * PAGESIZE) finally: 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], b'\0') self.assertEqual(m[0:3], b'\0\0\0') # Modify the file's content m[0] = b'3' m[PAGESIZE +3: PAGESIZE +3+3] = b'bar' # Check that the modification worked self.assertEqual(m[0], b'3') self.assertEqual(m[0:3], b'3\0\0') self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], b'\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) try: f.seek(0, 2) self.assertEqual(f.tell(), 512) finally: f.close() self.assertEqual(m.size(), 512) m.close() def test_access_parameter(self): # Test for "access" keyword parameter mapsize = 10 open(TESTFN, "wb").write(b"a"*mapsize) f = open(TESTFN, "rb") m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ) self.assertEqual(m[:], b'a'*mapsize, "Readonly memory map data incorrect.") # Ensuring that readonly mmap can't be slice assigned try: m[:] = b'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'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(b'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(b'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(), b'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[:] = b'c'*mapsize self.assertEqual(m[:], b'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, b'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[:] = b'd'*mapsize self.assertEqual(m[:], b'd' * mapsize, "Copy-on-write memory map data not written correctly.") m.flush() self.assertEqual(open(TESTFN, "rb").read(), b'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, 'wb+') data = b'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 + b'x'), -1) m.close() def test_double_close(self): # make sure a double close doesn't crash on Solaris (Bug# 665913) f = open(TESTFN, 'wb+') f.write(2**16 * b'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, "wb+") f.write(2**16 * b'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 * b"m") mf.close() f.close() def test_move(self): # make move works everywhere (64-bit format problem earlier) f = open(TESTFN, 'wb+') f.write(b"ABCDEabcde") # Arbitrary character f.flush() mf = mmap.mmap(f.fileno(), 10) mf.move(5, 0, 5) self.assertEqual(mf[:], b"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 range(PAGESIZE): self.assertEqual(m[x], b'\0', "anonymously mmap'ed contents should be zero") b = bytes(1) for x in range(PAGESIZE): b[0] = x & 255 m[x] = b self.assertEqual(m[x], b) def test_extended_getslice(self): # Test extended slicing by comparing with list slicing. s = bytes(reversed(range(256))) m = mmap.mmap(-1, len(s)) m[:] = s self.assertEqual(m[:], s) indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300) for start in indices: for stop in indices: # Skip step 0 (invalid) for step in indices[1:]: self.assertEqual(m[start:stop:step], s[start:stop:step]) def test_extended_set_del_slice(self): # Test extended slicing by comparing with list slicing. s = bytes(reversed(range(256))) m = mmap.mmap(-1, len(s)) indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300) for start in indices: for stop in indices: # Skip invalid step 0 for step in indices[1:]: m[:] = s self.assertEqual(m[:], s) L = list(s) # Make sure we have a slice of exactly the right length, # but with different data. data = L[start:stop:step] data = bytes(reversed(data)) L[start:stop:step] = data m[start:stop:step] = data self.assertEquals(m[:], bytes(L)) def make_mmap_file (self, f, halfsize): # Write 2 pages worth of data to the file f.write (b'\0' * halfsize) f.write (b'foo') f.write (b'\0' * (halfsize - 3)) f.flush () return mmap.mmap (f.fileno(), 0) def test_offset (self): f = open (TESTFN, 'w+b') try: # unlink TESTFN no matter what halfsize = mmap.ALLOCATIONGRANULARITY m = self.make_mmap_file (f, halfsize) m.close () f.close () mapsize = halfsize * 2 # Try invalid offset f = open(TESTFN, "r+b") for offset in [-2, -1, None]: try: m = mmap.mmap(f.fileno(), mapsize, offset=offset) self.assertEqual(0, 1) except (ValueError, TypeError, OverflowError): pass else: self.assertEqual(0, 0) f.close() # Try valid offset, hopefully 8192 works on all OSes f = open(TESTFN, "r+b") m = mmap.mmap(f.fileno(), mapsize - halfsize, offset=halfsize) self.assertEqual(m[0:3], b'foo') f.close() m.close() finally: f.close() try: os.unlink(TESTFN) except OSError: pass def test_main(): run_unittest(MmapTests) if __name__ == '__main__': test_main()