iLab Neuromorphic Robotics Toolkit  0.1
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SignalHandler.H
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1 /*! @file
2  @author Laurent Itti
3  @copyright GNU Public License (GPL v3)
4  @section License
5  @verbatim
6  // ////////////////////////////////////////////////////////////////////////
7  // The iLab Neuromorphic Robotics Toolkit (NRT) //
8  // Copyright 2010-2012 by the University of Southern California (USC) //
9  // and the iLab at USC. //
10  // //
11  // iLab - University of Southern California //
12  // Hedco Neurociences Building, Room HNB-10 //
13  // Los Angeles, Ca 90089-2520 - USA //
14  // //
15  // See http://ilab.usc.edu for information about this project. //
16  // ////////////////////////////////////////////////////////////////////////
17  // This file is part of The iLab Neuromorphic Robotics Toolkit. //
18  // //
19  // The iLab Neuromorphic Robotics Toolkit is free software: you can //
20  // redistribute it and/or modify it under the terms of the GNU General //
21  // Public License as published by the Free Software Foundation, either //
22  // version 3 of the License, or (at your option) any later version. //
23  // //
24  // The iLab Neuromorphic Robotics Toolkit is distributed in the hope //
25  // that it will be useful, but WITHOUT ANY WARRANTY; without even the //
26  // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
27  // PURPOSE. See the GNU General Public License for more details. //
28  // //
29  // You should have received a copy of the GNU General Public License //
30  // along with The iLab Neuromorphic Robotics Toolkit. If not, see //
31  // <http://www.gnu.org/licenses/>. //
32  // ////////////////////////////////////////////////////////////////////////
33  @endverbatim */
34 
35 #ifndef SRC_APPS_NRTDESIGNER_SIGNALHANDLER_H
36 #define SRC_APPS_NRTDESIGNER_SIGNALHANDLER_H
37 
38 #include <QObject>
39 #include <QSocketNotifier>
40 
41 //! Signal handler to gracefully shutdown the designer on control-c
42 /*! This is complex and code taken from https://qt-project.org/doc/qt-4.7/unix-signals.html */
43 class SignalHandler : public QObject
44 {
45  Q_OBJECT
46 
47  public:
48  SignalHandler(QObject *parent = 0);
49  ~SignalHandler();
50 
51  // Unix signal handlers.
52  static void hupSignalHandler(int unused);
53  static void termSignalHandler(int unused);
54  static void intSignalHandler(int unused);
55 
56  signals:
57  void userAbortSignal();
58 
59  public slots:
60  // Qt signal handlers.
61  void handleSigHup();
62  void handleSigTerm();
63  void handleSigInt();
64 
65  private:
66  static int sighupFd[2];
67  static int sigtermFd[2];
68  static int sigintFd[2];
69 
70  QSocketNotifier *snHup;
71  QSocketNotifier *snTerm;
72  QSocketNotifier *snInt;
73 };
74 
75 
76 
77 #endif // SRC_APPS_NRTDESIGNER_SIGNALHANDLER_H