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1// SignalHandler.cc for Fluxbox Window Manager
2// Copyright (c) 2002 Henrik Kinnunen (fluxgen@linuxmail.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// $Id: SignalHandler.cc,v 1.3 2002/10/12 13:28:03 fluxgen Exp $
23
24#include "SignalHandler.hh"
25
26namespace FbTk {
27
28EventHandler<SignalEvent> *SignalHandler::s_signal_handler[NSIG];
29
30SignalHandler::SignalHandler() {
31 // clear signal list
32 for (int i=0; i < NSIG; ++i)
33 s_signal_handler[i] = 0;
34}
35
36SignalHandler *SignalHandler::instance() {
37 static SignalHandler singleton;
38 return &singleton;
39}
40
41bool SignalHandler::registerHandler(int signum, EventHandler<SignalEvent> *eh,
42 EventHandler<SignalEvent> **oldhandler_ret) {
43 // must be less than NSIG
44 if (signum >= NSIG)
45 return false;
46
47 // get old signal handler for this signum
48 if (oldhandler_ret != 0)
49 *oldhandler_ret = s_signal_handler[signum];
50
51 struct sigaction sa;
52 // set callback
53 sa.sa_handler = SignalHandler::handleSignal;
54 sigemptyset (&sa.sa_mask);
55 sa.sa_flags = 0;
56
57 if (sigaction(signum, &sa, 0) == -1)
58 return false;
59
60 s_signal_handler[signum] = eh;
61
62 return true;
63}
64
65void SignalHandler::removeHandler(int signum) {
66 if (signum < NSIG)
67 s_signal_handler[signum] = 0; // clear handler pointer
68}
69
70void SignalHandler::handleSignal(int signum) {
71 if (signum >= NSIG)
72 return;
73 // make sure we got a handler for this signal
74 if (s_signal_handler[signum] != 0) {
75 SignalEvent sigev;
76 sigev.signum = signum;
77 s_signal_handler[signum]->handleEvent(&sigev);
78 }
79}
80
81};