From b5be5093fecd02f4ee537af5ad473899bb6d7a61 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Fri, 8 Sep 2017 20:48:28 +0200
Subject: [PATCH] Streams: fix XREAD timeout handling, zero is valid.

---
 src/t_stream.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/t_stream.c b/src/t_stream.c
index 0358e644..afa8224c 100644
--- a/src/t_stream.c
+++ b/src/t_stream.c
@@ -398,7 +398,7 @@ void xlenCommand(client *c) {
  *       [RETRY <milliseconds> <ttl>] STREAMS key_1 key_2 ... key_N
  *       ID_1 ID_2 ... ID_N */
 void xreadCommand(client *c) {
-    long long timeout = 0;
+    long long timeout = -1; /* -1 means, no BLOCK argument given. */
     long long count = 0;
     int streams_count = 0;
     int streams_arg = 0;
@@ -499,7 +499,7 @@ void xreadCommand(client *c) {
     }
 
     /* Block if needed. */
-    if (timeout) {
+    if (timeout != -1) {
         /* If we are inside a MULTI/EXEC and the list is empty the only thing
          * we can do is treating it as a timeout (even with timeout 0). */
         if (c->flags & CLIENT_MULTI) {