diff -r 65abb0376a0d -r 12e975f807ed src/PosixMQCommand.h
--- a/src/PosixMQCommand.h	Wed Apr 20 20:59:42 2022 +0200
+++ b/src/PosixMQCommand.h	Sat Apr 30 23:19:08 2022 +0200
@@ -20,6 +20,7 @@
 #include <sstream>
 #include <vector>
 #include <memory>
+#include <atomic>
 
 #include <relpipe/writer/TypeId.h>
 
@@ -32,11 +33,16 @@
 class PosixMQCommand {
 private:
 	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
+	std::atomic<bool> continueProcessing{true};
 public:
 	virtual ~PosixMQCommand();
 
 	void process(std::shared_ptr<writer::RelationalWriter> writer, Configuration& configuration);
 
+	void finish(int sig) {
+		continueProcessing = false;
+	}
+
 };
 
 }