| # -*- coding:utf-8 -*- |
| # Copyright 2016 The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Signal related functionality.""" |
| |
| from __future__ import print_function |
| |
| import os |
| import signal |
| import sys |
| |
| _path = os.path.realpath(__file__ + '/../..') |
| if sys.path[0] != _path: |
| sys.path.insert(0, _path) |
| del _path |
| |
| |
| def relay_signal(handler, signum, frame): |
| """Notify a listener returned from getsignal of receipt of a signal. |
| |
| Returns: |
| True if it was relayed to the target, False otherwise. |
| False in particular occurs if the target isn't relayable. |
| """ |
| if handler in (None, signal.SIG_IGN): |
| return True |
| if handler == signal.SIG_DFL: |
| # This scenario is a fairly painful to handle fully, thus we just |
| # state we couldn't handle it and leave it to client code. |
| return False |
| handler(signum, frame) |
| return True |