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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Debug Bridge.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "interruptsignalhandler.h"
#include "libqdb/make_unique.h"
#include <QtCore/qdebug.h>
#include <QtCore/qsocketnotifier.h>
#include <signal.h>
#include <sys/socket.h>
#include <unistd.h>
class InterruptSignalHandlerPrivate : public QObject
{
Q_OBJECT
public:
InterruptSignalHandlerPrivate(InterruptSignalHandler *owner);
static void sigIntHandler(int signalId);
public slots:
void handleSigInt();
public:
static int s_socketPair[2];
struct sigaction oldIntAction;
struct sigaction oldTermAction;
std::unique_ptr<QSocketNotifier> socketNotifier = nullptr;
private:
InterruptSignalHandler *q;
};
int InterruptSignalHandlerPrivate::s_socketPair[2] = {0, 0};
InterruptSignalHandler::InterruptSignalHandler(QObject *parent)
: QObject{parent}, d{new InterruptSignalHandlerPrivate{this}}
{
if (socketpair(AF_UNIX, SOCK_STREAM, 0, d->s_socketPair))
qFatal("Could not create socketpair for signal handling in InterruptSignalHandler");
d->socketNotifier = make_unique<QSocketNotifier>(d->s_socketPair[1], QSocketNotifier::Read);
connect(d->socketNotifier.get(), &QSocketNotifier::activated, d, &InterruptSignalHandlerPrivate::handleSigInt);
if (!installSignalHandler())
qFatal("Could not install signal handler in InterruptSignalHandler");
}
InterruptSignalHandler::~InterruptSignalHandler()
{
delete d;
}
bool InterruptSignalHandler::installSignalHandler()
{
struct sigaction action;
action.sa_handler = &InterruptSignalHandlerPrivate::sigIntHandler;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
action.sa_flags |= SA_RESTART;
if (sigaction(SIGINT, &action, &d->oldIntAction))
return false;
if (sigaction(SIGTERM, &action, &d->oldTermAction))
return false;
return true;
}
InterruptSignalHandlerPrivate::InterruptSignalHandlerPrivate(InterruptSignalHandler *owner)
: q{owner}
{
}
void InterruptSignalHandlerPrivate::sigIntHandler(int signalId)
{
Q_UNUSED(signalId);
char a = 1;
write(s_socketPair[0], &a, sizeof(a));
}
void InterruptSignalHandlerPrivate::handleSigInt()
{
char tmp;
read(s_socketPair[1], &tmp, sizeof(tmp));
// Reset signal actions to allow further signals to interrupt hanging qdb
sigaction(SIGINT, &oldIntAction, nullptr);
sigaction(SIGTERM, &oldTermAction, nullptr);
emit q->interrupted();
}
#include "interruptsignalhandler_unix.moc"
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