From df7c684dd590526c5f431c6d6460a6086756628d Mon Sep 17 00:00:00 2001
From: Patrick McLean <chutzpah@gentoo.org>
Date: Fri, 27 Jan 2017 17:04:42 -0800
Subject: [PATCH] fix divide by zero in zmq::lb_t::sendpipe

This is based on https://github.com/zeromq/zeromq3-x/pull/116/files
---
 src/lb.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lb.cpp b/src/lb.cpp
index 2787739e..c4a69178 100644
--- a/src/lb.cpp
+++ b/src/lb.cpp
@@ -137,7 +137,9 @@ int zmq::lb_t::sendpipe (msg_t *msg_, pipe_t **pipe_)
     more = msg_->flags () & msg_t::more? true: false;
     if (!more) {
         pipes [current]->flush ();
-        current = (current + 1) % active;
+
+        if (++current >= active)
+            current = 0;
     }
 
     //  Detach the message from the data buffer.