From 5363388fc57765a3bb4317a70d928c3242f40f1c Mon Sep 17 00:00:00 2001
From: Marc Sune <marc@voltanet.io>
Date: Wed, 7 Jun 2017 11:56:27 +0200
Subject: [PATCH] Fix rvalue for socket::send() on EHOSTUNREACH

During introduction of EHOSTUNREACH, missing mapping between
EHOSTUNREACH errno and false/0 return code for socket's send()
calls was missing, throwing an exception.

To be consistent with the rest of wrappers (e.g. DONTWAIT), fix it
by handling this errno as a regular EAGAIN, and let the caller use
errno/zmq_errno() to branch on their code.
---
 zmq.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/zmq.hpp b/zmq.hpp
index c72708b..7f8ff6b 100644
--- a/zmq.hpp
+++ b/zmq.hpp
@@ -631,6 +631,8 @@ namespace zmq
                 return (size_t) nbytes;
             if (zmq_errno () == EAGAIN)
                 return 0;
+            if (zmq_errno () == EHOSTUNREACH)
+                return 0;
             throw error_t ();
         }
 
@@ -641,6 +643,8 @@ namespace zmq
                 return true;
             if (zmq_errno () == EAGAIN)
                 return false;
+            if (zmq_errno () == EHOSTUNREACH)
+                return false;
             throw error_t ();
         }