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1 | /* |
2 | ||
3 | Copyright 2013 Adam Reichold | |
4 | ||
5 | This file is part of qpdfview. | |
6 | ||
7 | qpdfview is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | qpdfview is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. | |
19 | ||
20 | */ | |
21 | ||
22 | #include "signalhandler.h" | |
23 | ||
24 | #include <signal.h> | |
25 | #include <sys/socket.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include <QSocketNotifier> | |
29 | ||
30 | int SignalHandler::s_sockets[2]; | |
31 | ||
32 | bool SignalHandler::prepareSignals() | |
33 | { | |
34 | if(socketpair(AF_UNIX, SOCK_STREAM, 0, s_sockets) != 0) | |
35 | { | |
36 | return false; | |
37 | } | |
38 | ||
39 | struct sigaction sigAction; | |
40 | ||
41 | sigAction.sa_handler = SignalHandler::handleSignals; | |
42 | sigemptyset(&sigAction.sa_mask); | |
43 | sigAction.sa_flags = SA_RESTART; | |
44 | ||
45 | if(sigaction(SIGINT, &sigAction, 0) != 0) | |
46 | { | |
47 | close(s_sockets[0]); | |
48 | close(s_sockets[1]); | |
49 | ||
50 | return false; | |
51 | } | |
52 | ||
53 | if(sigaction(SIGTERM, &sigAction, 0) != 0) | |
54 | { | |
55 | close(s_sockets[0]); | |
56 | close(s_sockets[1]); | |
57 | ||
58 | return false; | |
59 | } | |
60 | ||
61 | return true; | |
62 | } | |
63 | ||
64 | SignalHandler::SignalHandler(QObject* parent) : QObject(parent), | |
65 | m_socketNotifier(0) | |
66 | { | |
67 | m_socketNotifier = new QSocketNotifier(s_sockets[1], QSocketNotifier::Read, this); | |
68 | connect(m_socketNotifier, SIGNAL(activated(int)), SLOT(on_socketNotifier_activated())); | |
69 | } | |
70 | ||
71 | void SignalHandler::on_socketNotifier_activated() | |
72 | { | |
73 | m_socketNotifier->setEnabled(false); | |
74 | ||
75 | int sigNumber; | |
76 | read(s_sockets[1], &sigNumber, sizeof(int)); | |
77 | ||
78 | switch(sigNumber) | |
79 | { | |
80 | case SIGINT: | |
81 | emit sigIntReceived(); | |
82 | break; | |
83 | case SIGTERM: | |
84 | emit sigTermReceived(); | |
85 | break; | |
86 | } | |
87 | ||
88 | m_socketNotifier->setEnabled(true); | |
89 | } | |
90 | ||
91 | void SignalHandler::handleSignals(int sigNumber) | |
92 | { | |
93 | write(s_sockets[0], &sigNumber, sizeof(int)); | |
94 | } |