From 01797cf1bc9993423f2966c48800266f75ba0e4b Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Fri, 1 Mar 2019 13:29:15 +0300
Subject: [PATCH] mdbx: env_open() consider zero mode_t as open-existing flag.

Change-Id: I6f9dbf2059822afaba4c3de8f4ce380613a7dc36
---
 src/mdbx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index 091b4921..bdf3185f 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -6489,8 +6489,10 @@ int __cold mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
   int oflags;
   if (F_ISSET(flags, MDBX_RDONLY))
     oflags = O_RDONLY;
-  else
+  else if (mode != 0)
     oflags = O_RDWR | O_CREAT;
+  else
+    oflags = O_RDWR;
 
   rc = mdbx_openfile(dxb_pathname, oflags, mode, &env->me_fd,
                      (env->me_flags & MDBX_EXCLUSIVE) ? true : false);