1 | /* |
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2 | |
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3 | Copyright 2013, 2015 Adam Reichold |
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4 | |
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5 | This file is part of qpdfview. |
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6 | |
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7 | qpdfview is free software: you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation, either version 2 of the License, or |
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10 | (at your option) any later version. |
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11 | |
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12 | qpdfview is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
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19 | |
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20 | */ |
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21 | |
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22 | #include "signalhandler.h" |
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23 | |
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24 | #include <signal.h> |
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25 | #include <sys/socket.h> |
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26 | #include <unistd.h> |
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27 | |
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28 | #include <QSocketNotifier> |
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29 | |
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30 | namespace qpdfview |
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31 | { |
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32 | |
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33 | int SignalHandler::s_sockets[2]; |
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34 | |
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35 | bool SignalHandler::prepareSignals() |
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36 | { |
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37 | if(socketpair(AF_UNIX, SOCK_STREAM, 0, s_sockets) != 0) |
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38 | { |
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39 | return false; |
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40 | } |
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41 | |
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42 | struct sigaction sigAction; |
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43 | |
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44 | sigAction.sa_handler = SignalHandler::handleSignals; |
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45 | sigemptyset(&sigAction.sa_mask); |
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46 | sigAction.sa_flags = SA_RESTART; |
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47 | |
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48 | if(sigaction(SIGINT, &sigAction, 0) != 0) |
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49 | { |
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50 | close(s_sockets[0]); |
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51 | close(s_sockets[1]); |
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52 | |
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53 | return false; |
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54 | } |
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55 | |
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56 | if(sigaction(SIGTERM, &sigAction, 0) != 0) |
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57 | { |
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58 | close(s_sockets[0]); |
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59 | close(s_sockets[1]); |
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60 | |
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61 | return false; |
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62 | } |
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63 | |
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64 | return true; |
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65 | } |
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66 | |
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67 | SignalHandler::SignalHandler(QObject* parent) : QObject(parent), |
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68 | m_socketNotifier(0) |
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69 | { |
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70 | m_socketNotifier = new QSocketNotifier(s_sockets[1], QSocketNotifier::Read, this); |
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71 | connect(m_socketNotifier, SIGNAL(activated(int)), SLOT(on_socketNotifier_activated())); |
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72 | } |
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73 | |
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74 | void SignalHandler::on_socketNotifier_activated() |
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75 | { |
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76 | m_socketNotifier->setEnabled(false); |
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77 | |
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78 | int sigNumber = 0; |
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79 | Q_UNUSED(read(s_sockets[1], &sigNumber, sizeof(int))); |
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80 | |
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81 | switch(sigNumber) |
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82 | { |
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83 | case SIGINT: |
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84 | emit sigIntReceived(); |
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85 | break; |
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86 | case SIGTERM: |
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87 | emit sigTermReceived(); |
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88 | break; |
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89 | } |
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90 | |
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91 | m_socketNotifier->setEnabled(true); |
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92 | } |
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93 | |
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94 | void SignalHandler::handleSignals(int sigNumber) |
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95 | { |
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96 | Q_UNUSED(write(s_sockets[0], &sigNumber, sizeof(int))); |
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97 | } |
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98 | |
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99 | } // qpdfview |
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