Merge pull request #1584 from ymax/master

fixed zmq assertion in signaler.cpp under ubuntu

src/signaler.cpp

@@ -289,6 +289,10 @@ void zmq::signaler_t::recv ()
 #if defined ZMQ_HAVE_EVENTFD
     uint64_t dummy;
     ssize_t sz = read (r, &dummy, sizeof (dummy));
+    if (sz == -1) {
+        errno_assert (errno == EAGAIN);
+    }
+    else {
         errno_assert (sz == sizeof (dummy));
 
         //  If we accidentally grabbed the next signal(s) along with the current
@@ -301,6 +305,7 @@ void zmq::signaler_t::recv ()
         }
 
         zmq_assert (dummy == 1);
+    }
 #else
     unsigned char dummy;
 #if defined ZMQ_HAVE_WINDOWS