utils/inc/SignalHandler.h

/*
 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted (subject to the limitations in the
 * disclaimer below) provided that the following conditions are met:
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 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
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 *     * Neither the name of Qualcomm Innovation Center, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
 * GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 */

#ifndef SIGNAL_HANDLER_H
#define SIGNAL_HANDLER_H

#include <functional>
#include <future>
#include <memory>
#include <thread>
#include <vector>
#include <unordered_map>
#include <signal.h>

#ifndef __SIGRTMIN
#define __SIGRTMIN 32
#endif

static const constexpr int DEBUGGER_SIGNAL = (__SIGRTMIN + 3);
static const constexpr uint32_t kDefaultSignalPendingTries = 10;
static const constexpr uint32_t kDefaultRegistrationDelayMs = 500;

struct SignalHandler {
    static std::shared_ptr<SignalHandler> getInstance();
    static void setClientCallback(std::function<void(int, pid_t, uid_t)> cb);
    static void asyncRegister(int signal);
    static void invokeDefaultHandler(std::shared_ptr<struct sigaction> sAct,
                              int code, struct siginfo *si, void *sc);
    static void customSignalHandler(int code, struct siginfo *si, void *sc);
    static std::vector<int> getRegisteredSignals();
    void registerSignalHandler(std::vector<int> signalsToRegister);
    static std::mutex sDefaultSigMapLock;
    static std::unordered_map<int, std::shared_ptr<struct sigaction>> sDefaultSigMap;
    static std::function<void(int, pid_t, uid_t)> sClientCb;
    static std::mutex sAsyncRegisterLock;
    static std::future<void> sAsyncHandle;
};

#endif