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1// SignalHandler.hh for FbTk
2// Copyright (c) 2002 - 2003 Henrik Kinnunen (fluxgen at fluxbox dot org)
3//
4// Permission is hereby granted, free of charge, to any person obtaining a
5// copy of this software and associated documentation files (the "Software"),
6// to deal in the Software without restriction, including without limitation
7// the rights to use, copy, modify, merge, publish, distribute, sublicense,
8// and/or sell copies of the Software, and to permit persons to whom the
9// Software is furnished to do so, subject to the following conditions:
10//
11// The above copyright notice and this permission notice shall be included in
12// all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20// DEALINGS IN THE SOFTWARE.
21
22#ifndef FBTK_SIGNALHANDLER_HH
23#define FBTK_SIGNALHANDLER_HH
24
25#include <signal.h>
26
27namespace FbTk {
28
29/// Base class that SignalHandler calls when it gets a signal
30/// Use this to catch system signals
31class SignalEventHandler {
32public:
33 virtual void handleSignal(int signum) = 0;
34 virtual ~SignalEventHandler() { }
35};
36
37/// Handles system signals, singleton.
38/**
39 Usage: inherit the class SignalEventHandler and then register
40 it to SignalHandler by calling registerHandler with
41 a signal number
42*/
43class SignalHandler {
44public:
45 /// get singleton object
46 static SignalHandler &instance();
47 /**
48 Register an event handler
49 @return true on success else false
50 @param signum signal number
51 @param eh event handler
52 @param oldhandler_ret return handler to old sighandler
53 */
54 bool registerHandler(int signum, SignalEventHandler *eh, SignalEventHandler **oldhandler_ret = 0);
55
56private:
57 SignalHandler();
58
59 static void handleSignal(int signum);
60
61 static SignalEventHandler *s_signal_handler[NSIG]; ///< NSIG defined in signal.h
62};
63
64} // end namespace FbTk
65
66#endif // FBTK_SIGNALHANDLER_HH