From 67ee7c32e72ca6be40f3437316505dc208509c0d Mon Sep 17 00:00:00 2001
From: Clemens Kirchgatterer <clemens@1541.org>
Date: Tue, 9 Apr 2019 21:15:21 +0200
Subject: [PATCH] workaround for FS implementations that do not support
 fflush() (#2596)

https://github.com/espressif/arduino-esp32/issues/1293
---
 libraries/FS/src/vfs_api.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/FS/src/vfs_api.cpp b/libraries/FS/src/vfs_api.cpp
index 2b91eb82..6502f760 100644
--- a/libraries/FS/src/vfs_api.cpp
+++ b/libraries/FS/src/vfs_api.cpp
@@ -340,6 +340,8 @@ void VFSFileImpl::flush()
         return;
     }
     fflush(_f);
+    // workaround for https://github.com/espressif/arduino-esp32/issues/1293
+    fsync(fileno(_f));
 }
 
 bool VFSFileImpl::seek(uint32_t pos, SeekMode mode)