From 630f9fdcc7539bb2f98f1954296ea11ef7d01b2c Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Fri, 10 Jun 2016 14:29:31 +0200
Subject: [PATCH] auth: Handle `read()` returning 0 in RemoteBackend's unix
 connector

Otherwise it looks like we may loop in `recv_message()` until the
timeout is reached if the other end closes the connection:
* `waitForData()` will return immediately
* `read()` will keep returning 0
---
 modules/remotebackend/unixconnector.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/remotebackend/unixconnector.cc b/modules/remotebackend/unixconnector.cc
index 5c5a7216f..f997183e2 100644
--- a/modules/remotebackend/unixconnector.cc
+++ b/modules/remotebackend/unixconnector.cc
@@ -89,7 +89,7 @@ ssize_t UnixsocketConnector::read(std::string &data) {
   // just try again later...
   if (nread==-1 && errno == EAGAIN) return 0;
 
-  if (nread==-1) {
+  if (nread==-1 || nread==0) {
     connected = false;
     close(fd);
     return -1;
-- 
2.40.0