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