diff -r e8aae4d42c01 -r 326935d1bfab src/JackCommand.h
--- a/src/JackCommand.h	Wed Oct 07 22:29:38 2020 +0200
+++ b/src/JackCommand.h	Thu Oct 08 16:45:50 2020 +0200
@@ -187,7 +187,7 @@
 		writer->startRelation(L"port", metadata, true);
 
 		const char** portNames = jack_get_ports(realTimeContext.jackClient, nullptr, nullptr, 0);
-		
+
 		std::regex midiTypePattern(".*midi$");
 
 		for (const char** portName = portNames; *portName; portName++) {
@@ -216,6 +216,36 @@
 		jack_free(portNames);
 	}
 
+	void listConnections(std::shared_ptr<relpipe::writer::RelationalWriter> writer) {
+		using namespace relpipe::writer;
+		vector<AttributeMetadata> metadata;
+
+		metadata.push_back({L"event", TypeId::STRING});
+		metadata.push_back({L"source_port", TypeId::STRING});
+		metadata.push_back({L"destination_port", TypeId::STRING});
+		writer->startRelation(L"connection", metadata, true);
+
+		const relpipe::common::type::StringX event = L"connect";
+
+		const char** sourcePortNames = jack_get_ports(realTimeContext.jackClient, nullptr, nullptr, JackPortFlags::JackPortIsOutput);
+
+		for (const char** sourcePortName = sourcePortNames; *sourcePortName; sourcePortName++) {
+			jack_port_t* sourcePort = jack_port_by_name(realTimeContext.jackClient, *sourcePortName);
+
+			const char** destinationPortNames = jack_port_get_all_connections(realTimeContext.jackClient, sourcePort);
+
+			for (const char** destinationPortName = destinationPortNames; destinationPortNames && *destinationPortName; destinationPortName++) {
+				writer->writeAttribute(event);
+				writer->writeAttribute(convertor.from_bytes(*sourcePortName));
+				writer->writeAttribute(convertor.from_bytes(*destinationPortName));
+			}
+
+			jack_free(destinationPortNames);
+		}
+
+		jack_free(sourcePortNames);
+	}
+
 	static void jackErrorCallback(const char * message) {
 		std::wstring_convert < std::codecvt_utf8<wchar_t>> convertor; // TODO: local system encoding
 		std::wcerr << L"JACK: " << convertor.from_bytes(message) << std::endl;
@@ -282,6 +312,7 @@
 		vector<AttributeMetadata> metadata;
 
 		if (configuration.listPorts) listPorts(writer);
+		if (configuration.listConnections) listConnections(writer);
 		if (!configuration.listMidiMessages) return;
 
 		metadata.push_back({L"event", TypeId::STRING});