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