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Commit | Line | Data |
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7a255aa9 | 1 | /* |
708605aa JH |
2 | * This file is part of the PulseView project. |
3 | * | |
4 | * Copyright (C) 2013 Adam Reichold | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
efdec55a | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
708605aa | 18 | */ |
7a255aa9 | 19 | |
2acdb232 | 20 | #include "signalhandler.hpp" |
7a255aa9 | 21 | |
eb8269e3 UH |
22 | #include <cassert> |
23 | #include <csignal> | |
24 | #include <cstdlib> | |
25 | ||
7a255aa9 JH |
26 | #include <sys/socket.h> |
27 | #include <unistd.h> | |
28 | ||
70c0818c | 29 | #include <QDebug> |
7a255aa9 JH |
30 | #include <QSocketNotifier> |
31 | ||
8dbbc7f0 | 32 | int SignalHandler::sockets_[2]; |
7a255aa9 | 33 | |
708605aa | 34 | bool SignalHandler::prepare_signals() |
7a255aa9 | 35 | { |
f3290553 | 36 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets_) != 0) |
708605aa | 37 | return false; |
7a255aa9 | 38 | |
708605aa | 39 | struct sigaction sig_action; |
7a255aa9 | 40 | |
708605aa JH |
41 | sig_action.sa_handler = SignalHandler::handle_signals; |
42 | sigemptyset(&sig_action.sa_mask); | |
43 | sig_action.sa_flags = SA_RESTART; | |
7a255aa9 | 44 | |
f74015db | 45 | if (sigaction(SIGINT, &sig_action, nullptr) != 0 || |
f1e9295a MB |
46 | sigaction(SIGTERM, &sig_action, nullptr) != 0 || |
47 | sigaction(SIGUSR1, &sig_action, nullptr) != 0) { | |
8dbbc7f0 JH |
48 | close(sockets_[0]); |
49 | close(sockets_[1]); | |
708605aa JH |
50 | return false; |
51 | } | |
7a255aa9 | 52 | |
708605aa | 53 | return true; |
7a255aa9 JH |
54 | } |
55 | ||
56 | SignalHandler::SignalHandler(QObject* parent) : QObject(parent), | |
f74015db | 57 | socket_notifier_(nullptr) |
7a255aa9 | 58 | { |
8dbbc7f0 | 59 | socket_notifier_ = new QSocketNotifier(sockets_[1], |
708605aa | 60 | QSocketNotifier::Read, this); |
8dbbc7f0 | 61 | connect(socket_notifier_, SIGNAL(activated(int)), |
708605aa | 62 | SLOT(on_socket_notifier_activated())); |
7a255aa9 JH |
63 | } |
64 | ||
708605aa | 65 | void SignalHandler::on_socket_notifier_activated() |
7a255aa9 | 66 | { |
8dbbc7f0 | 67 | socket_notifier_->setEnabled(false); |
708605aa JH |
68 | |
69 | int sig_number; | |
f3290553 | 70 | if (read(sockets_[1], &sig_number, sizeof(int)) != sizeof(int)) { |
70c0818c JH |
71 | qDebug() << "Failed to catch signal"; |
72 | abort(); | |
73 | } | |
708605aa | 74 | |
c063290a | 75 | switch (sig_number) { |
708605aa | 76 | case SIGINT: |
e9213170 | 77 | Q_EMIT int_received(); |
708605aa JH |
78 | break; |
79 | case SIGTERM: | |
e9213170 | 80 | Q_EMIT term_received(); |
708605aa | 81 | break; |
f1e9295a MB |
82 | case SIGUSR1: |
83 | Q_EMIT usr1_received(); | |
84 | break; | |
708605aa JH |
85 | } |
86 | ||
8dbbc7f0 | 87 | socket_notifier_->setEnabled(true); |
7a255aa9 JH |
88 | } |
89 | ||
708605aa | 90 | void SignalHandler::handle_signals(int sig_number) |
7a255aa9 | 91 | { |
f3290553 | 92 | if (write(sockets_[0], &sig_number, sizeof(int)) != sizeof(int)) { |
70c0818c JH |
93 | // Failed to handle signal |
94 | abort(); | |
95 | } | |
7a255aa9 | 96 | } |