Close #10142: Support for SEEK_HOLE/SEEK_DATA
diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 142dddd..c8798a9 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -1009,6 +1009,26 @@
posix.RTLD_GLOBAL
posix.RTLD_LOCAL
+ @unittest.skipUnless('PC_MIN_HOLE_SIZE' in os.pathconf_names,
+ "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):