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bpo-35633: test_lockf() fails with "PermissionError: [Errno 13] Permission denied" on AIX (pythonGH-11424)
[bpo-35633](https://bugs.python.org/issue35633): Fix a test regression introduced with [bpo-35189](https://bugs.python.org/issue35189) (PEP 475: fnctl functions are not retried if interrupted (EINTR)). Not only a blocking IO error needs to be ignored - permission errors also need to be ignored. p.s. - iirc as a "test" only correction a NEWS item is not required. If this is not correct - just mention, and I'll add a NEWS blurb. https://bugs.python.org/issue35633
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‎Lib/test/eintrdata/eintr_tester.py‎

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import faulthandler
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import fcntl
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import os
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import platform
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import select
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import signal
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import socket
@@ -518,6 +519,9 @@ def _lock(self, lock_func, lock_name):
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self.stop_alarm()
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proc.wait()
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# Issue 35633: See https://bugs.python.org/issue35633#msg333662
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# skip test rather than accept PermissionError from all platforms
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@unittest.skipIf(platform.system() == "AIX", "AIX returns PermissionError")
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def test_lockf(self):
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self._lock(fcntl.lockf, "lockf")
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