returns EHOSTUNREACH when a peer is full if ZMQ_ROUTER_MANDATORY is set

src/router.cpp

@@ -156,19 +156,24 @@ int zmq::router_t::xsend (msg_t *msg_)
 
             //  Find the pipe associated with the identity stored in the prefix.
             //  If there's no such pipe just silently ignore the message, unless
-            //  report_unreachable is set.
+            //  router_mandatory is set.
             blob_t identity ((unsigned char*) msg_->data (), msg_->size ());
             outpipes_t::iterator it = outpipes.find (identity);
+            bool unreach = false;
 
             if (it != outpipes.end ()) {
                 current_out = it->second.pipe;
                 if (!current_out->check_write ()) {
                     it->second.active = false;
                     current_out = NULL;
+                    unreach = true;
                 }
             }
             else
-            if (mandatory) {
+            if (mandatory)
+                unreach = true;
+
+            if (unreach) {
                 more_out = false;
                 errno = EHOSTUNREACH;
                 return -1;

tests/test_router_mandatory.cpp

@@ -21,6 +21,7 @@
 
 #include <stdio.h>
 #include "testutil.hpp"
+#include "../include/zmq_utils.h"
 
 int main (void)
 {
@@ -33,7 +34,11 @@ int main (void)
     void *sa = zmq_socket (ctx, ZMQ_ROUTER);
     assert (sa);
     
-    int rc = zmq_bind (sa, "tcp://127.0.0.1:15560");
+    int hwm = 1;
+    int rc = zmq_setsockopt (sa, ZMQ_SNDHWM, &hwm, sizeof (hwm));
+    assert (rc == 0);
+
+    rc = zmq_bind (sa, "tcp://127.0.0.1:15560");
     assert (rc == 0);
 
     // Sending a message to an unknown peer with the default setting
@@ -52,9 +57,48 @@ int main (void)
     rc = zmq_send (sa, "UNKNOWN", 7, ZMQ_SNDMORE | ZMQ_DONTWAIT);
     assert (rc == -1 && errno == EHOSTUNREACH);
 
+    // Create a valid socket
+    void *sb = zmq_socket (ctx, ZMQ_DEALER);
+    assert (sb);
+
+    rc = zmq_setsockopt (sb, ZMQ_RCVHWM, &hwm, sizeof (hwm));
+    assert (rc == 0);
+
+    rc = zmq_setsockopt (sb, ZMQ_IDENTITY, "X", 1);
+    assert (rc == 0);
+    
+    rc = zmq_connect (sb, "tcp://127.0.0.1:15560");
+    assert (rc == 0);
+
+    // wait until connect
+    zmq_sleep (1); 
+
+    // make it full and check that it fails
+    rc = zmq_send (sa, "X", 1, ZMQ_SNDMORE);
+    assert (rc == 1);
+    rc = zmq_send (sa, "DATA1", 5, 0);
+    assert (rc == 5);
+
+
+    rc = zmq_send (sa, "X", 1, ZMQ_SNDMORE);
+    if (rc == 1) {
+        // the first frame has been sent
+        rc = zmq_send (sa, "DATA2", 5, 0);
+        assert (rc == 5);
+    
+        // send more
+        rc = zmq_send (sa, "X", 1, ZMQ_SNDMORE);
+    } 
+
+    assert (rc == -1 && errno == EHOSTUNREACH);
+
+
     rc = zmq_close (sa);
     assert (rc == 0);
 
+    rc = zmq_close (sb);
+    assert (rc == 0);
+
     rc = zmq_term (ctx);
     assert (rc == 0);