//
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// Copyright (C) 2012 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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//
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#ifndef UPDATE_ENGINE_COMMON_TERMINATOR_H_
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#define UPDATE_ENGINE_COMMON_TERMINATOR_H_
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#include <signal.h>
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#include <gtest/gtest_prod.h> // for FRIEND_TEST
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namespace chromeos_update_engine {
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// A class allowing graceful delayed exit.
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class Terminator {
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public:
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// Initializes the terminator and sets up signal handlers.
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static void Init();
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static void Init(int exit_status);
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// Terminates the current process.
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static void Exit();
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// Set to true if the terminator should block termination requests in an
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// attempt to block exiting.
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static void set_exit_blocked(bool block) { exit_blocked_ = block ? 1 : 0; }
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static bool exit_blocked() { return exit_blocked_ != 0; }
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// Returns true if the system is trying to terminate the process, false
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// otherwise. Returns true only if exit was blocked when the termination
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// request arrived.
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static bool exit_requested() { return exit_requested_ != 0; }
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private:
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FRIEND_TEST(TerminatorTest, HandleSignalTest);
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FRIEND_TEST(TerminatorDeathTest, ScopedTerminatorExitUnblockerExitTest);
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// The signal handler.
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static void HandleSignal(int signum);
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static volatile sig_atomic_t exit_status_;
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static volatile sig_atomic_t exit_blocked_;
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static volatile sig_atomic_t exit_requested_;
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};
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class ScopedTerminatorExitUnblocker {
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public:
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~ScopedTerminatorExitUnblocker();
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_COMMON_TERMINATOR_H_
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