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42 lines
1.3 KiB
42 lines
1.3 KiB
# Copyright 2016 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Signal related functionality."""
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import os
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import signal
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import sys
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_path = os.path.realpath(__file__ + '/../..')
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if sys.path[0] != _path:
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sys.path.insert(0, _path)
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del _path
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def relay_signal(handler, signum, frame):
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"""Notify a listener returned from getsignal of receipt of a signal.
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Returns:
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True if it was relayed to the target, False otherwise.
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False in particular occurs if the target isn't relayable.
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"""
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if handler in (None, signal.SIG_IGN):
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return True
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if handler == signal.SIG_DFL:
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# This scenario is a fairly painful to handle fully, thus we just
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# state we couldn't handle it and leave it to client code.
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return False
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handler(signum, frame)
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return True
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