Added openport program to test a port unavailable

src/Makefile.am

 INCLUDES = -I$(top_srcdir)/src
 
 bin_PROGRAMS = \
+	openport \
 	testcameo \
 	testveryfast \
 	testsimple \
@@ -44,6 +45,13 @@ bin_PROGRAMS = \
 	testcomport \
 	teststartcomport
 	
+openport_SOURCES = \
+	OpenPort.cpp
+
+openport_CPPFLAGS = $(CT_CXXFLAGS)
+openport_LDFLAGS = $(CT_LDFLAGS)
+openport_LDADD = $(CT_LIBS)
+
 
 testcameo_SOURCES = \
 	Test.cpp

src/OpenPort.cpp

+/*
+ * Copyright 2015 Institut Laue-Langevin
+ *
+ * Licensed under the EUPL, Version 1.1 only (the "License");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ *
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+
+#include "zmq.hpp"
+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char *argv[]) {
+
+	if (argc < 3) {
+		cout << "usage: <port>" << endl;
+		return 1;
+	}
+
+
+	string port(argv[1]);
+
+	zmq::context_t context(1);
+
+	zmq::socket_t socket(context, ZMQ_REP);
+
+	string endpoint("tcp://*:");
+	endpoint += port;
+
+	cout << "trying to bind " << endpoint << endl;
+
+	try {
+		socket.bind(endpoint.c_str());
+	}
+	catch (const exception& e) {
+		cout << "cannot bind port: " << e.what() << endl;
+		return 1;
+	}
+
+	cout << "bound port " << port << endl;
+
+	int c;
+	cin >> c;
+
+	return 0;
+}