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authorNadeem Vawda <nadeem.vawda@gmail.com>2011-05-07 11:11:59 (GMT)
committerNadeem Vawda <nadeem.vawda@gmail.com>2011-05-07 11:11:59 (GMT)
commit02e656962854d15f9adc2f3cde03950ad440b094 (patch)
treee25f1795c84c388fae5397674fd2966e8b923902 /Lib/test
parent65b7eff7c7b00bcd39ee3abfda00f9c556b24504 (diff)
parentc2bb07374236f13894509ade6ddc2b996df76f2f (diff)
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Merge: #11277: Add tests for mmap crash when using large sparse files on OS X.
Also, reduce code duplication in LargeMmapTests. Original patch by Steffen Daode Nurpmeso.
Diffstat (limited to 'Lib/test')
-rw-r--r--Lib/test/test_mmap.py57
1 files changed, 31 insertions, 26 deletions
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index e62a046..be588cf 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -1,4 +1,5 @@
-from test.support import TESTFN, run_unittest, import_module, unlink, requires
+from test.support import (TESTFN, run_unittest, import_module, unlink,
+ requires, _2G, _4G)
import unittest
import os
import re
@@ -662,45 +663,49 @@ class LargeMmapTests(unittest.TestCase):
def tearDown(self):
unlink(TESTFN)
- def _working_largefile(self):
- # Only run if the current filesystem supports large files.
- f = open(TESTFN, 'wb', buffering=0)
- try:
- f.seek(0x80000001)
- f.write(b'x')
- f.flush()
- except (IOError, OverflowError):
- raise unittest.SkipTest("filesystem does not have largefile support")
- finally:
- f.close()
- unlink(TESTFN)
-
- def test_large_offset(self):
+ def _create_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))
- self._working_largefile()
with open(TESTFN, 'wb') as f:
- f.seek(0x14FFFFFFF)
- f.write(b" ")
+ try:
+ f.seek(num_zeroes)
+ f.write(tail)
+ f.flush()
+ except (IOError, OverflowError):
+ raise unittest.SkipTest("filesystem does not have largefile support")
+ def test_large_offset(self):
+ self._create_test_file(0x14FFFFFFF, b" ")
with open(TESTFN, 'rb') as f:
with mmap.mmap(f.fileno(), 0, offset=0x140000000, access=mmap.ACCESS_READ) as m:
self.assertEqual(m[0xFFFFFFF], 32)
def test_large_filesize(self):
- if sys.platform[:3] == 'win' or sys.platform == 'darwin':
- requires('largefile',
- 'test requires %s bytes and a long time to run' % str(0x180000000))
- self._working_largefile()
- with open(TESTFN, 'wb') as f:
- f.seek(0x17FFFFFFF)
- f.write(b" ")
-
+ self._create_test_file(0x17FFFFFFF, b" ")
with open(TESTFN, 'rb') as f:
with mmap.mmap(f.fileno(), 0x10000, access=mmap.ACCESS_READ) as m:
self.assertEqual(m.size(), 0x180000000)
+ # 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)
+ self._create_test_file(start, tail)
+ with open(TESTFN, 'rb') as f:
+ with mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) as m:
+ self.assertEqual(m[start:end], tail)
+
+ @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)