From 25cd884f6b494a88bd491a8d9a50486e3f1e6751 Mon Sep 17 00:00:00 2001
From: Jin Qing <jinq0123@163.com>
Date: Fri, 30 Dec 2016 23:13:02 +0800
Subject: [PATCH] Fix __redisSetErrorFromErrno() can not get error string.

snprintf() may change errno.
---
 net.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net.c b/net.c
index 7d41209..024f645 100644
--- a/net.c
+++ b/net.c
@@ -65,12 +65,13 @@ static void redisContextCloseFd(redisContext *c) {
 }
 
 static void __redisSetErrorFromErrno(redisContext *c, int type, const char *prefix) {
+    int errorno = errno;  /* snprintf() may change errno */
     char buf[128] = { 0 };
     size_t len = 0;
 
     if (prefix != NULL)
         len = snprintf(buf,sizeof(buf),"%s: ",prefix);
-    __redis_strerror_r(errno, (char *)(buf + len), sizeof(buf) - len);
+    __redis_strerror_r(errorno, (char *)(buf + len), sizeof(buf) - len);
     __redisSetError(c,type,buf);
 }