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/*
This file is part of libkdbus
SPDX-FileCopyrightText: 2019 Harald Sitter <sitter@kde.org>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include <QCoreApplication>
#include <QDebug>
#include <QThread>
#include <kdbusservice.h>
// sigaction
#include <signal.h>
// close
#include <unistd.h>
// rlimit
#include <sys/resource.h>
#include <sys/time.h>
// USR1.
// Close all sockets and eventually ABRT. This mimics behavior during KCrash
// handling. Closing all sockets will effectively disconnect us from the bus
// and result in the daemon reclaiming all our service names and allowing
// other processes to register them instead.
void usr1_handler(int signum)
{
qDebug() << "usr1" << signum << SIGSEGV;
// Close all remaining file descriptors so we drop off of the bus.
struct rlimit rlp;
getrlimit(RLIMIT_NOFILE, &rlp);
for (int i = 3; i < (int)rlp.rlim_cur; i++) {
close(i);
}
// Sleep a bit for good measure. We could actually loop ad infinitum here
// as after USR1 we are expected to get killed. In the interest of sane
// behavior we'll simply exit on our own as well though.
sleep(4);
abort();
}
// Simple application under test.
// Closes all sockets on USR1 and aborts to simulate a kcrash shutdown behavior
// which can result in a service registration race.
int main(int argc, char *argv[])
{
qDebug() << "hello there!";
struct sigaction action;
action.sa_handler = usr1_handler;
sigemptyset(&action.sa_mask);
sigaddset(&action.sa_mask, SIGUSR1);
action.sa_flags = SA_RESTART;
if (sigaction(SIGUSR1, &action, nullptr) < 0) {
qDebug() << "failed to register segv handler";
return 1;
}
QCoreApplication app(argc, argv);
QCoreApplication::setApplicationName("kdbussimpleservice");
QCoreApplication::setOrganizationDomain("kde.org");
KDBusService service(KDBusService::Unique);
if (!service.isRegistered()) {
qDebug() << "service not registered => exiting";
return 1;
}
qDebug() << "service registered";
int ret = app.exec();
qDebug() << "exiting deadservice";
return ret;
}
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