add loopback test for shmem interface

tests/integration/pipe-loopback-shmem.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+#
+# Integration loopback test for villas-pipe.
+#
+# @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
+# @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
+# @license GNU General Public License (version 3)
+#
+# VILLASnode
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##################################################################################
+
+CONFIG_FILE=$(mktemp)
+INPUT_FILE=$(mktemp)
+OUTPUT_FILE=$(mktemp)
+
+cat > ${CONFIG_FILE} <<- EOF
+nodes = {
+	node1 = {
+		type = "shmem";
+		out_name = "/villas-test";
+		in_name = "/villas-test";
+		samplelen = 4;
+		queuelen = 32;
+		polling = false;
+		vectorize = 1
+	}
+}
+EOF
+
+# Generate test data
+villas-signal random -l 10 -n > ${INPUT_FILE}
+
+# We delay EOF of the INPUT_FILE by 1 second in order to wait for incoming data to be received
+villas-pipe ${CONFIG_FILE} node1 > ${OUTPUT_FILE} < <(cat ${INPUT_FILE}; sleep 1; echo -n)
+
+# Comapre data
+villas-test-cmp ${INPUT_FILE} ${OUTPUT_FILE}
+RC=$?
+
+rm ${OUTPUT_FILE} ${INPUT_FILE} ${CONFIG_FILE}
+
+exit $RC