diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/test/test_os.py | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py index 5f73af8..36ad587 100644 --- a/Lib/test/test_os.py +++ b/Lib/test/test_os.py @@ -24,6 +24,7 @@ import subprocess import sys import sysconfig import tempfile +import textwrap import time import types import unittest @@ -2883,6 +2884,49 @@ class Win32NtTests(unittest.TestCase): self.assertEqual(0, handle_delta) + @support.requires_subprocess() + def test_stat_unlink_race(self): + # bpo-46785: the implementation of os.stat() falls back to reading + # the parent directory if CreateFileW() fails with a permission + # error. If reading the parent directory fails because the file or + # directory are subsequently unlinked, or because the volume or + # share are no longer available, then the original permission error + # should not be restored. + filename = os_helper.TESTFN + self.addCleanup(os_helper.unlink, filename) + deadline = time.time() + 5 + command = textwrap.dedent("""\ + import os + import sys + import time + + filename = sys.argv[1] + deadline = float(sys.argv[2]) + + while time.time() < deadline: + try: + with open(filename, "w") as f: + pass + except OSError: + pass + try: + os.remove(filename) + except OSError: + pass + """) + + with subprocess.Popen([sys.executable, '-c', command, filename, str(deadline)]) as proc: + while time.time() < deadline: + try: + os.stat(filename) + except FileNotFoundError as e: + assert e.winerror == 2 # ERROR_FILE_NOT_FOUND + try: + proc.wait(1) + except subprocess.TimeoutExpired: + proc.terminate() + + @os_helper.skip_unless_symlink class NonLocalSymlinkTests(unittest.TestCase): |