Add a signal handler for SIGINT when building a detector

DDCore/src/DetectorImp.cpp

@@ -33,6 +33,8 @@
 #include <stdexcept>
 #include <cerrno>
 #include <mutex>
+#include <csignal>
+#include <cstdlib>
 
 // ROOT inlcude files
 #include <TGeoSystemOfUnits.h>
@@ -811,6 +813,19 @@ void DetectorImp::init() {
 /// Read any geometry description or alignment file
 void DetectorImp::fromXML(const std::string& xmlfile, DetectorBuildType build_type) {
   std::lock_guard<std::recursive_mutex> lock(s_detector_apply_lock);
+
+  // Install signal handler for SIGINT (Ctrl-C)
+  struct sigaction sigIntHandler;
+
+  sigIntHandler.sa_handler = [](int) {
+    std::cerr << "Caught signal SIGINT, exiting..." << std::endl;
+    exit(1);
+  };
+  sigemptyset(&sigIntHandler.sa_mask);
+  sigIntHandler.sa_flags = 0;
+
+  sigaction(SIGINT, &sigIntHandler, NULL);
+
   m_buildType = build_type;
   processXML(xmlfile, 0);
 }