/usr/lib/python3/dist-packages/fixtures/_fixtures/timeout.py is in python3-fixtures 1.3.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | # fixtures: Fixtures with cleanups for testing and convenience.
#
# Copyright (C) 2011, Martin Pool <mbp@sourcefrog.net>
#
# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
# license at the users choice. A copy of both licenses are available in the
# project source as Apache-2.0 and BSD. You may not use this file except in
# compliance with one of these two licences.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# license you chose for the specific language governing permissions and
# limitations under that license.
"""Timeout fixture."""
import signal
import fixtures
__all__ = [
'Timeout',
'TimeoutException',
]
class TimeoutException(Exception):
"""Timeout expired"""
class Timeout(fixtures.Fixture):
"""Fixture that aborts the contained code after a number of seconds.
The interrupt can be either gentle, in which case TimeoutException is
raised, or not gentle, in which case the process will typically be aborted
by SIGALRM.
Cautions:
* This has no effect on Windows.
* Only one Timeout can be used at any time per process.
"""
def __init__(self, timeout_secs, gentle):
self.timeout_secs = timeout_secs
self.alarm_fn = getattr(signal, 'alarm', None)
self.gentle = gentle
def signal_handler(self, signum, frame):
raise TimeoutException()
def _setUp(self):
if self.alarm_fn is None:
return # Can't run on Windows
if self.gentle:
# Install a handler for SIGARLM so we can raise an exception rather
# than the default handler executing, which kills the process.
old_handler = signal.signal(signal.SIGALRM, self.signal_handler)
# We add the slarm cleanup before the cleanup for the signal handler,
# otherwise there is a race condition where the signal handler is
# cleaned up but the alarm still fires.
self.addCleanup(lambda: self.alarm_fn(0))
self.alarm_fn(self.timeout_secs)
if self.gentle:
self.addCleanup(lambda: signal.signal(signal.SIGALRM, old_handler))
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