/*
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* Copyright (C) 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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*/
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#ifndef LIBMEMUNREACHABLE_SCOPED_ALARM_H_
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#define LIBMEMUNREACHABLE_SCOPED_ALARM_H_
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#include <signal.h>
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#include <sys/time.h>
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#include <chrono>
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#include <functional>
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namespace android {
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class ScopedAlarm {
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public:
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ScopedAlarm(std::chrono::microseconds us, std::function<void()> func) {
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func_ = func;
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struct sigaction oldact {};
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struct sigaction act {};
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act.sa_handler = [](int) { ScopedAlarm::func_(); };
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sigaction(SIGALRM, &act, &oldact);
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std::chrono::seconds s = std::chrono::duration_cast<std::chrono::seconds>(us);
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itimerval t = itimerval{};
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t.it_value.tv_sec = s.count();
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t.it_value.tv_usec = (us - s).count();
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setitimer(ITIMER_REAL, &t, NULL);
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}
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~ScopedAlarm() {
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itimerval t = itimerval{};
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setitimer(ITIMER_REAL, &t, NULL);
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struct sigaction act {};
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act.sa_handler = SIG_DFL;
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sigaction(SIGALRM, &act, NULL);
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}
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private:
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static std::function<void()> func_;
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};
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} // namespace android
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#endif
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