Add test for HWM behaviour for mandatory ROUTER sockets over tcp

tests/Makefile.am

@@ -20,6 +20,7 @@ noinst_PROGRAMS = test_system \
                   test_srcfd \
                   test_monitor \
                   test_router_mandatory \
+                  test_router_mandatory_hwm \
                   test_router_handover \
                   test_probe_router \
                   test_stream \
@@ -96,6 +97,7 @@ test_term_endpoint_SOURCES = test_term_endpoint.cpp
 test_srcfd_SOURCES = test_srcfd.cpp
 test_monitor_SOURCES = test_monitor.cpp
 test_router_mandatory_SOURCES = test_router_mandatory.cpp
+test_router_mandatory_hwm_SOURCES = test_router_mandatory_hwm.cpp
 test_router_handover_SOURCES = test_router_handover.cpp
 test_probe_router_SOURCES = test_probe_router.cpp
 test_stream_SOURCES = test_stream.cpp

tests/test_router_mandatory_hwm.cpp

+/*
+    Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include "testutil.hpp"
+#include <unistd.h>
+
+#define DEBUG 0
+
+int main (void)
+{
+    int rc;
+    if (DEBUG) fprintf(stderr, "Staring router mandatory HWM test ...\n");
+    setup_test_environment();
+    void *ctx = zmq_ctx_new ();
+    assert (ctx);
+    void *router = zmq_socket (ctx, ZMQ_ROUTER);
+    assert (router);
+
+    // Configure router socket to mandatory routing and set HWM and linger
+    int mandatory = 1;
+    rc = zmq_setsockopt (router, ZMQ_ROUTER_MANDATORY, &mandatory, sizeof (mandatory));
+    assert (rc == 0);
+    int sndhwm = 1;
+    rc = zmq_setsockopt (router, ZMQ_SNDHWM, &sndhwm, sizeof (sndhwm));
+    assert (rc == 0);
+    int linger = 1;
+    rc = zmq_setsockopt (router, ZMQ_LINGER, &linger, sizeof (linger));
+    assert (rc == 0);
+
+    rc = zmq_bind (router, "tcp://127.0.0.1:5560");
+    assert (rc == 0);
+
+    //  Create dealer called "X" and connect it to our router, configure HWM
+    void *dealer = zmq_socket (ctx, ZMQ_DEALER);
+    assert (dealer);
+    rc = zmq_setsockopt (dealer, ZMQ_IDENTITY, "X", 1);
+    assert (rc == 0);
+    int rcvhwm = 1;
+    rc = zmq_setsockopt (dealer, ZMQ_RCVHWM, &rcvhwm, sizeof (rcvhwm));
+    assert (rc == 0);
+
+    rc = zmq_connect (dealer, "tcp://127.0.0.1:5560");
+    assert (rc == 0);
+
+    //  Get message from dealer to know when connection is ready
+    char buffer [255];
+    rc = zmq_send (dealer, "Hello", 5, 0);
+    assert (rc == 5);
+    rc = zmq_recv (router, buffer, 255, 0);
+    assert (rc == 1);
+    assert (buffer [0] ==  'X');
+
+    int i;
+    const int BUF_SIZE = 65536;
+    char buf[BUF_SIZE];
+    // Send first batch of messages
+    for(i = 0; i < 100000; ++i) {
+	if (DEBUG) fprintf(stderr, "Sending message %d ...\n", i);
+	rc = zmq_send (router, "X", 1, ZMQ_DONTWAIT | ZMQ_SNDMORE);
+	if (rc == -1 && zmq_errno() == EAGAIN) break;
+	assert (rc == 1);
+	rc = zmq_send (router, buf, BUF_SIZE, ZMQ_DONTWAIT);
+	assert (rc == BUF_SIZE);
+    }
+    // This should fail after one message but kernel buffering could
+    // skew results
+    assert (i < 10);
+    sleep(1);
+    // Send second batch of messages
+    for(; i < 100000; ++i) {
+	if (DEBUG) fprintf(stderr, "Sending message %d (part 2) ...\n", i);
+	rc = zmq_send (router, "X", 1, ZMQ_DONTWAIT | ZMQ_SNDMORE);
+	if (rc == -1 && zmq_errno() == EAGAIN) break;
+	assert (rc == 1);
+	rc = zmq_send (router, buf, BUF_SIZE, ZMQ_DONTWAIT);
+	assert (rc == BUF_SIZE);
+    }
+    // This should fail after two messages but kernel buffering could
+    // skew results
+    assert (i < 20);
+
+    if (DEBUG) fprintf(stderr, "Done sending messages.\n");
+
+    rc = zmq_close (router);
+    assert (rc == 0);
+
+    rc = zmq_close (dealer);
+    assert (rc == 0);
+
+    rc = zmq_ctx_term (ctx);
+    assert (rc == 0);
+
+    return 0 ;
+}