SignalHandler.h

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#pragma once
 
#include <atomic>
 
#include <QtCore/QLoggingCategory>
#include <QtCore/QObject>
 
#ifdef Q_OS_WIN
    class QWinEventNotifier;
#else
    class QSocketNotifier;
#endif
 
Q_DECLARE_LOGGING_CATEGORY(SignalHandlerLog)
 
class SignalHandler final : public QObject
{
    Q_OBJECT
 
public:
    explicit SignalHandler(QObject* parent = nullptr);
    ~SignalHandler() override;
 
    int setupSignalHandlers();
 
    static SignalHandler* current() { return s_current.load(std::memory_order_acquire); }
 
#ifdef Q_OS_WIN
    static int consoleCtrlHandler(unsigned long evt);
#else
private slots:
    void _onSigInt();
    void _onSigTerm();
#endif
 
private:
#ifdef Q_OS_WIN
    QWinEventNotifier* _notifier{nullptr};
    Qt::HANDLE _signalEvent{nullptr};
#else
    static void _intSignalHandler(int signum);
    static void _termSignalHandler(int signum);
 
    int _sigIntFd[2] = {-1, -1};   // socketpair read=0, write=1
    int _sigTermFd[2] = {-1, -1};
    QSocketNotifier* _notifierInt{nullptr};
    QSocketNotifier* _notifierTerm{nullptr};
#endif
 
    bool _sigIntTriggered{false};
    static std::atomic<SignalHandler*> s_current;
};