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-rw-r--r--lib/python2.7/test/test_mmap.py724
1 files changed, 724 insertions, 0 deletions
diff --git a/lib/python2.7/test/test_mmap.py b/lib/python2.7/test/test_mmap.py
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+++ b/lib/python2.7/test/test_mmap.py
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+from test.test_support import (TESTFN, run_unittest, import_module, unlink,
+ requires, _2G, _4G)
+import unittest
+import os, re, itertools, socket, sys
+
+mmap = import_module('mmap')
+
+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')
+
+ # Shouldn't crash on boundary (Issue #5292)
+ self.assertRaises(IndexError, m.__getitem__, len(m))
+ self.assertRaises(IndexError, m.__setitem__, len(m), '\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")
+ f.close()
+ 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)
+ f.close()
+ 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()
+
+ # Try writing with PROT_EXEC and without PROT_WRITE
+ prot = mmap.PROT_READ | getattr(mmap, 'PROT_EXEC', 0)
+ with open(TESTFN, "r+b") as f:
+ m = mmap.mmap(f.fileno(), mapsize, prot=prot)
+ self.assertRaises(TypeError, m.write, b"abcdef")
+ self.assertRaises(TypeError, m.write_byte, 0)
+ m.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_find_end(self):
+ # test the new 'end' parameter works as expected
+ f = open(TESTFN, 'w+')
+ data = 'one two ones'
+ n = len(data)
+ f.write(data)
+ f.flush()
+ m = mmap.mmap(f.fileno(), n)
+ f.close()
+
+ self.assertEqual(m.find('one'), 0)
+ self.assertEqual(m.find('ones'), 8)
+ self.assertEqual(m.find('one', 0, -1), 0)
+ self.assertEqual(m.find('one', 1), 8)
+ self.assertEqual(m.find('one', 1, -1), 8)
+ self.assertEqual(m.find('one', 1, -2), -1)
+
+
+ def test_rfind(self):
+ # test the new 'end' parameter works as expected
+ f = open(TESTFN, 'w+')
+ data = 'one two ones'
+ n = len(data)
+ f.write(data)
+ f.flush()
+ m = mmap.mmap(f.fileno(), n)
+ f.close()
+
+ self.assertEqual(m.rfind('one'), 8)
+ self.assertEqual(m.rfind('one '), 0)
+ self.assertEqual(m.rfind('one', 0, -1), 8)
+ self.assertEqual(m.rfind('one', 0, -2), 0)
+ self.assertEqual(m.rfind('one', 1, -1), 8)
+ self.assertEqual(m.rfind('one', 1, -2), -1)
+
+
+ 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_length_0_offset(self):
+ # Issue #10916: test mapping of remainder of file by passing 0 for
+ # map length with an offset doesn't cause a segfault.
+ if not hasattr(os, "stat"):
+ self.skipTest("needs os.stat")
+ # NOTE: allocation granularity is currently 65536 under Win64,
+ # and therefore the minimum offset alignment.
+ with open(TESTFN, "wb") as f:
+ f.write((65536 * 2) * b'm') # Arbitrary character
+
+ with open(TESTFN, "rb") as f:
+ mf = mmap.mmap(f.fileno(), 0, offset=65536, access=mmap.ACCESS_READ)
+ try:
+ self.assertRaises(IndexError, mf.__getitem__, 80000)
+ finally:
+ mf.close()
+
+ def test_length_0_large_offset(self):
+ # Issue #10959: test mapping of a file by passing 0 for
+ # map length with a large offset doesn't cause a segfault.
+ if not hasattr(os, "stat"):
+ self.skipTest("needs os.stat")
+
+ with open(TESTFN, "wb") as f:
+ f.write(115699 * b'm') # Arbitrary character
+
+ with open(TESTFN, "w+b") as f:
+ self.assertRaises(ValueError, mmap.mmap, f.fileno(), 0,
+ offset=2147418112)
+
+ 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()
+
+ # more excessive test
+ data = "0123456789"
+ for dest in range(len(data)):
+ for src in range(len(data)):
+ for count in range(len(data) - max(dest, src)):
+ expected = data[:dest] + data[src:src+count] + data[dest+count:]
+ m = mmap.mmap(-1, len(data))
+ m[:] = data
+ m.move(dest, src, count)
+ self.assertEqual(m[:], expected)
+ m.close()
+
+ # segfault test (Issue 5387)
+ m = mmap.mmap(-1, 100)
+ offsets = [-100, -1, 0, 1, 100]
+ for source, dest, size in itertools.product(offsets, offsets, offsets):
+ try:
+ m.move(source, dest, size)
+ except ValueError:
+ pass
+
+ offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
+ (-1, 0, 0), (0, -1, 0), (0, 0, -1)]
+ for source, dest, size in offsets:
+ self.assertRaises(ValueError, m.move, source, dest, size)
+
+ m.close()
+
+ m = mmap.mmap(-1, 1) # single byte
+ self.assertRaises(ValueError, m.move, 0, 0, 2)
+ self.assertRaises(ValueError, m.move, 1, 0, 1)
+ self.assertRaises(ValueError, m.move, 0, 1, 1)
+ m.move(0, 0, 1)
+ m.move(0, 0, 0)
+
+
+ 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_extended_getslice(self):
+ # Test extended slicing by comparing with list slicing.
+ s = "".join(chr(c) for c in 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 = "".join(chr(c) for c in 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 = "".join(reversed(data))
+ L[start:stop:step] = data
+ m[start:stop:step] = data
+ self.assertEqual(m[:], "".join(L))
+
+ def make_mmap_file (self, f, halfsize):
+ # Write 2 pages worth of data to the file
+ f.write ('\0' * halfsize)
+ f.write ('foo')
+ f.write ('\0' * (halfsize - 3))
+ f.flush ()
+ return mmap.mmap (f.fileno(), 0)
+
+ def test_empty_file (self):
+ f = open (TESTFN, 'w+b')
+ f.close()
+ with open(TESTFN, "rb") as f :
+ try:
+ m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
+ m.close()
+ self.fail("should not have been able to mmap empty file")
+ except ValueError as e:
+ self.assertEqual(e.message, "cannot mmap an empty file")
+ except:
+ self.fail("unexpected exception: " + str(e))
+
+ 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], 'foo')
+ f.close()
+
+ # Try resizing map
+ try:
+ m.resize(512)
+ except SystemError:
+ 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 content is not changed
+ self.assertEqual(m[0:3], 'foo')
+
+ # Check that the underlying file is truncated too
+ f = open(TESTFN)
+ f.seek(0, 2)
+ self.assertEqual(f.tell(), halfsize + 512)
+ f.close()
+ self.assertEqual(m.size(), halfsize + 512)
+
+ m.close()
+
+ finally:
+ f.close()
+ try:
+ os.unlink(TESTFN)
+ except OSError:
+ pass
+
+ def test_subclass(self):
+ class anon_mmap(mmap.mmap):
+ def __new__(klass, *args, **kwargs):
+ return mmap.mmap.__new__(klass, -1, *args, **kwargs)
+ anon_mmap(PAGESIZE)
+
+ def test_prot_readonly(self):
+ if not hasattr(mmap, 'PROT_READ'):
+ return
+ mapsize = 10
+ open(TESTFN, "wb").write("a"*mapsize)
+ f = open(TESTFN, "rb")
+ m = mmap.mmap(f.fileno(), mapsize, prot=mmap.PROT_READ)
+ self.assertRaises(TypeError, m.write, "foo")
+ f.close()
+
+ def test_error(self):
+ self.assertTrue(issubclass(mmap.error, EnvironmentError))
+ self.assertIn("mmap.error", str(mmap.error))
+
+ def test_io_methods(self):
+ data = "0123456789"
+ open(TESTFN, "wb").write("x"*len(data))
+ f = open(TESTFN, "r+b")
+ m = mmap.mmap(f.fileno(), len(data))
+ f.close()
+ # Test write_byte()
+ for i in xrange(len(data)):
+ self.assertEqual(m.tell(), i)
+ m.write_byte(data[i])
+ self.assertEqual(m.tell(), i+1)
+ self.assertRaises(ValueError, m.write_byte, "x")
+ self.assertEqual(m[:], data)
+ # Test read_byte()
+ m.seek(0)
+ for i in xrange(len(data)):
+ self.assertEqual(m.tell(), i)
+ self.assertEqual(m.read_byte(), data[i])
+ self.assertEqual(m.tell(), i+1)
+ self.assertRaises(ValueError, m.read_byte)
+ # Test read()
+ m.seek(3)
+ self.assertEqual(m.read(3), "345")
+ self.assertEqual(m.tell(), 6)
+ # Test write()
+ m.seek(3)
+ m.write("bar")
+ self.assertEqual(m.tell(), 6)
+ self.assertEqual(m[:], "012bar6789")
+ m.seek(8)
+ self.assertRaises(ValueError, m.write, "bar")
+
+ if os.name == 'nt':
+ def test_tagname(self):
+ data1 = "0123456789"
+ data2 = "abcdefghij"
+ assert len(data1) == len(data2)
+
+ # Test same tag
+ m1 = mmap.mmap(-1, len(data1), tagname="foo")
+ m1[:] = data1
+ m2 = mmap.mmap(-1, len(data2), tagname="foo")
+ m2[:] = data2
+ self.assertEqual(m1[:], data2)
+ self.assertEqual(m2[:], data2)
+ m2.close()
+ m1.close()
+
+ # Test different tag
+ m1 = mmap.mmap(-1, len(data1), tagname="foo")
+ m1[:] = data1
+ m2 = mmap.mmap(-1, len(data2), tagname="boo")
+ m2[:] = data2
+ self.assertEqual(m1[:], data1)
+ self.assertEqual(m2[:], data2)
+ m2.close()
+ m1.close()
+
+ def test_crasher_on_windows(self):
+ # Should not crash (Issue 1733986)
+ m = mmap.mmap(-1, 1000, tagname="foo")
+ try:
+ mmap.mmap(-1, 5000, tagname="foo")[:] # same tagname, but larger size
+ except:
+ pass
+ m.close()
+
+ # Should not crash (Issue 5385)
+ open(TESTFN, "wb").write("x"*10)
+ f = open(TESTFN, "r+b")
+ m = mmap.mmap(f.fileno(), 0)
+ f.close()
+ try:
+ m.resize(0) # will raise WindowsError
+ except:
+ pass
+ try:
+ m[:]
+ except:
+ pass
+ m.close()
+
+ def test_invalid_descriptor(self):
+ # socket file descriptors are valid, but out of range
+ # for _get_osfhandle, causing a crash when validating the
+ # parameters to _get_osfhandle.
+ s = socket.socket()
+ try:
+ with self.assertRaises(mmap.error):
+ m = mmap.mmap(s.fileno(), 10)
+ finally:
+ s.close()
+
+
+class LargeMmapTests(unittest.TestCase):
+
+ def setUp(self):
+ unlink(TESTFN)
+
+ def tearDown(self):
+ unlink(TESTFN)
+
+ def _make_test_file(self, num_zeroes, tail):
+ if sys.platform[:3] == 'win' or sys.platform == 'darwin':
+ 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 (IOError, OverflowError):
+ f.close()
+ 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:
+ m = mmap.mmap(f.fileno(), 0, offset=0x140000000, access=mmap.ACCESS_READ)
+ try:
+ self.assertEqual(m[0xFFFFFFF], b" ")
+ finally:
+ m.close()
+
+ def test_large_filesize(self):
+ with self._make_test_file(0x17FFFFFFF, b" ") as f:
+ if sys.maxsize < 0x180000000:
+ # On 32 bit platforms the file is larger than sys.maxsize so
+ # mapping the whole file should fail -- Issue #16743
+ with self.assertRaises(OverflowError):
+ mmap.mmap(f.fileno(), 0x180000000, access=mmap.ACCESS_READ)
+ with self.assertRaises(ValueError):
+ mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
+ m = mmap.mmap(f.fileno(), 0x10000, access=mmap.ACCESS_READ)
+ try:
+ self.assertEqual(m.size(), 0x180000000)
+ finally:
+ m.close()
+
+ # Issue 11277: mmap() with large (~4GB) sparse files crashes on OS X.
+
+ def _test_around_boundary(self, boundary):
+ tail = b' DEARdear '
+ start = boundary - len(tail) // 2
+ end = start + len(tail)
+ with self._make_test_file(start, tail) as f:
+ m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
+ try:
+ self.assertEqual(m[start:end], tail)
+ finally:
+ m.close()
+
+ @unittest.skipUnless(sys.maxsize > _4G, "test cannot run on 32-bit systems")
+ def test_around_2GB(self):
+ self._test_around_boundary(_2G)
+
+ @unittest.skipUnless(sys.maxsize > _4G, "test cannot run on 32-bit systems")
+ def test_around_4GB(self):
+ self._test_around_boundary(_4G)
+
+
+def test_main():
+ run_unittest(MmapTests, LargeMmapTests)
+
+if __name__ == '__main__':
+ test_main()
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-10 23:40:48 +0000