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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#pragma once
#include <QtAppManCommon/global.h>
#include <QObject>
#include <QAtomicInteger>
#include <initializer_list>
#include <list>
#include <vector>
#include <functional>
#include <signal.h>
#if defined(Q_OS_UNIX)
# include <unistd.h>
#elif defined(Q_OS_WIN)
# include <QMutex>
# include <QWinEventNotifier>
#endif
QT_BEGIN_NAMESPACE_AM
class UnixSignalHandler : public QObject
{
Q_OBJECT
public:
static UnixSignalHandler *instance();
static const char *signalName(int sig);
void resetToDefault(int sig);
void resetToDefault(const std::initializer_list<int> &sigs);
enum Type {
RawSignalHandler,
ForwardedToEventLoopHandler
};
bool install(Type handlerType, int sig, const std::function<void(int)> &handler);
bool install(Type handlerType, const std::initializer_list<int> &sigs,
const std::function<void(int)> &handler);
private:
UnixSignalHandler();
static UnixSignalHandler *s_instance;
struct SigHandler
{
SigHandler(int signal, bool qt, const std::function<void(int)> &handler);
int m_signal;
bool m_qt;
std::function<void(int)> m_handler;
mutable QAtomicInteger<bool> m_disabled;
};
std::list<SigHandler> m_handlers; // we're using STL to avoid (accidental) implicit copies
int m_currentSignal = 0;
#if defined(Q_ATOMIC_INT64_IS_SUPPORTED)
// 64 bits are currently enough to map all Linux signals
typedef quint64 am_sigmask_t;
#else
// 32 bits are sufficient for Win32 (which does not support 64 bit atomics)
typedef quint32 am_sigmask_t;
#endif
static am_sigmask_t am_sigmask(int sig);
QAtomicInteger<am_sigmask_t> m_resetSignalMask;
#if defined(Q_OS_UNIX)
int m_pipe[2] = { -1, -1 };
#elif defined(Q_OS_WIN)
QMutex m_winLock;
QWinEventNotifier *m_winEvent = nullptr;
QList<int> m_signalsForEventLoop;
#endif
};
QT_END_NAMESPACE_AM
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