React to some common Unix signals.

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.28)
 
 project(BtScreenLocker
-    VERSION 1.6.4
+    VERSION 1.6.5
     LANGUAGES CXX
     DESCRIPTION "Daemon to lock your screen if trusted Bluetooth devices go away."
 )

src/main.cpp

@@ -1,3 +1,4 @@
+#include <csignal>
 #include <map>
 
 #include <QApplication>
@@ -11,16 +12,18 @@
 #include <QSharedPointer>
 #include <QStandardPaths>
 #include <QTranslator>
+#include <QVector>
 
 #include "listener.hpp"
 #include "logger.hpp"
 #include "screenlocker.hpp"
 
+void setupSignals(const QVector<int> sigs);
+void signalHandler(int signal);
 QList<QCommandLineOption> commandLineOptions(const char *name);
 QTranslator *setAppLanguage(std::map<QString, Logger::TYPE> &logMessages, const QString &language);
 int enableAutostart(const QCommandLineParser &parser, Logger &logger, const char *name);
 void registerDBusService(Listener &listener, Logger &logger);
-void usage(const char *programName);
 
 int main(int argc, char *argv[])
 {
@@ -29,6 +32,8 @@ int main(int argc, char *argv[])
     QApplication a(argc, argv);
     a.setQuitOnLastWindowClosed(false);
 
+    setupSignals({ SIGINT, SIGHUP, SIGTERM, SIGQUIT });
+
     QCommandLineParser parser;
     parser.setApplicationDescription(PROJECT_DESCRIPTION);
     parser.addHelpOption();
@@ -111,6 +116,19 @@ int main(int argc, char *argv[])
     return a.exec();
 }
 
+void setupSignals(const QVector<int> sigs)
+{
+    for (const int sig : sigs) {
+        signal(sig, signalHandler);
+    }
+}
+
+void signalHandler(int signal)
+{
+    qInfo() << "Exiting because of signal:" << signal;
+    QApplication::exit(signal);
+}
+
 QList<QCommandLineOption> commandLineOptions(const char *name)
 {
     QList<QCommandLineOption> options;