watchdog.h

/*
 *  Copyright 2021 Google, Inc
 *
 *  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.
 */

#pragma once

#include <atomic>
#include <signal.h>
#include <time.h>

class Watchdog {
private:
    int timeout_;
    timer_t timer_;
    std::atomic<bool> timer_created_;
    void (*callback_)();
public:
    Watchdog(int timeout, void (*callback)()) :
        timeout_(timeout), timer_created_(false), callback_(callback) {}

    bool init();
    bool start();
    bool stop();
    // used by the watchdog_main
    bool create_timer(sigset_t &sigset);
    void bite() const { if (callback_) callback_(); }
};