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Closes #10142: Support for SEEK_HOLE/SEEK_DATA

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This commit is contained in:
Jesus Cea 2012-06-22 18:32:07 +02:00
parent ff493c9c46
commit 9436361e4c
9 changed files with 71 additions and 12 deletions
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20
Lib/test/test_posix.py
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@ -1015,6 +1015,26 @@ class PosixTester(unittest.TestCase):
posix.RTLD_GLOBAL
posix.RTLD_LOCAL
@unittest.skipUnless(hasattr(os, 'SEEK_HOLE'),
"test needs an OS that reports file holes")
def test_fs_holes(self) :
# Even if the filesystem doesn't report holes,
# if the OS supports it the SEEK_* constants
# will be defined and will have a consistent
# behaviour:
# os.SEEK_DATA = current position
# os.SEEK_HOLE = end of file position
with open(support.TESTFN, 'r+b') as fp :
fp.write(b"hello")
fp.flush()
size = fp.tell()
fno = fp.fileno()
for i in range(size) :
self.assertEqual(i, os.lseek(fno, i, os.SEEK_DATA))
self.assertLessEqual(size, os.lseek(fno, i, os.SEEK_HOLE))
self.assertRaises(OSError, os.lseek, fno, size, os.SEEK_DATA)
self.assertRaises(OSError, os.lseek, fno, size, os.SEEK_HOLE)
class PosixGroupsTester(unittest.TestCase):
def setUp(self):