unixsignalhandler.hpp

/* Copyright (c) 2014, The Nuria Project
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *    1. The origin of this software must not be misrepresented; you must not
 *       claim that you wrote the original software. If you use this software
 *       in a product, an acknowledgment in the product documentation would be
 *       appreciated but is not required.
 *    2. Altered source versions must be plainly marked as such, and must not be
 *       misrepresented as being the original software.
 *    3. This notice may not be removed or altered from any source
 *       distribution.
 */

#ifndef UNIXSIGNALHANDLER_HPP
#define UNIXSIGNALHANDLER_HPP

#include "callback.hpp"
#include <QObject>

namespace Nuria {

class UnixSignalHandlerPrivate;

class NURIA_CORE_EXPORT UnixSignalHandler : public QObject {
    Q_OBJECT
public:
    
    static UnixSignalHandler *get ();
    
    ~UnixSignalHandler () override;
    
    bool listenToUnixSignal (int signalId);
    
    bool ignoreUnixSignal (int signalId);
    
    bool isListeningTo (int signalId);
    
    void invokeOnSignal (int signalId, const Callback &callback);
    
signals:
    
    void signalRaised (int signalId);
    
    void sigTerm ();
    
    void sigInterrupt ();
    
    void sigUser1 ();
    
    void sigUser2 ();
    
private slots:
    
    void signalDelegate ();
    
private:
    explicit UnixSignalHandler (QObject *parent = 0);
    
    bool createInternalPipe ();
    void printError (const char *message);
    bool tryReadUnixSignal ();
    void invokeSignalHandlers (int signalId);
    
    UnixSignalHandlerPrivate *d_ptr;
    
};

}

#endif // UNIXSIGNALHANDLER_HPP