]>
Commit | Line | Data |
---|---|---|
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 | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
7a255aa9 JH |
20 | |
21 | #include "signalhandler.h" | |
22 | ||
70c0818c | 23 | #include <assert.h> |
7a255aa9 | 24 | #include <signal.h> |
70c0818c | 25 | #include <stdlib.h> |
7a255aa9 JH |
26 | #include <sys/socket.h> |
27 | #include <unistd.h> | |
28 | ||
70c0818c | 29 | #include <QDebug> |
7a255aa9 JH |
30 | #include <QSocketNotifier> |
31 | ||
708605aa | 32 | int SignalHandler::_sockets[2]; |
7a255aa9 | 33 | |
708605aa | 34 | bool SignalHandler::prepare_signals() |
7a255aa9 | 35 | { |
708605aa JH |
36 | if(socketpair(AF_UNIX, SOCK_STREAM, 0, _sockets) != 0) |
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 | |
708605aa JH |
45 | if(sigaction(SIGINT, &sig_action, 0) != 0 || |
46 | sigaction(SIGTERM, &sig_action, 0) != 0) { | |
47 | close(_sockets[0]); | |
48 | close(_sockets[1]); | |
49 | return false; | |
50 | } | |
7a255aa9 | 51 | |
708605aa | 52 | return true; |
7a255aa9 JH |
53 | } |
54 | ||
55 | SignalHandler::SignalHandler(QObject* parent) : QObject(parent), | |
708605aa | 56 | _socket_notifier(0) |
7a255aa9 | 57 | { |
708605aa JH |
58 | _socket_notifier = new QSocketNotifier(_sockets[1], |
59 | QSocketNotifier::Read, this); | |
60 | connect(_socket_notifier, SIGNAL(activated(int)), | |
61 | SLOT(on_socket_notifier_activated())); | |
7a255aa9 JH |
62 | } |
63 | ||
708605aa | 64 | void SignalHandler::on_socket_notifier_activated() |
7a255aa9 | 65 | { |
708605aa JH |
66 | _socket_notifier->setEnabled(false); |
67 | ||
68 | int sig_number; | |
70c0818c JH |
69 | if(read(_sockets[1], &sig_number, sizeof(int)) != |
70 | sizeof(int)) { | |
71 | qDebug() << "Failed to catch signal"; | |
72 | abort(); | |
73 | } | |
708605aa JH |
74 | |
75 | switch(sig_number) | |
76 | { | |
77 | case SIGINT: | |
e9213170 | 78 | Q_EMIT int_received(); |
708605aa JH |
79 | break; |
80 | case SIGTERM: | |
e9213170 | 81 | Q_EMIT term_received(); |
708605aa JH |
82 | break; |
83 | } | |
84 | ||
85 | _socket_notifier->setEnabled(true); | |
7a255aa9 JH |
86 | } |
87 | ||
708605aa | 88 | void SignalHandler::handle_signals(int sig_number) |
7a255aa9 | 89 | { |
70c0818c JH |
90 | if(write(_sockets[0], &sig_number, sizeof(int)) != |
91 | sizeof(int)) { | |
92 | // Failed to handle signal | |
93 | abort(); | |
94 | } | |
7a255aa9 | 95 | } |