workaround for FS implementations that do not support fflush() (#2596)

dash0820 · dash0820 · commit 8378192374e4 · 2019-04-09T21:15:21.000+02:00
espressif/arduino-esp32#1293
diff --git 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)

Original file line number	Diff line number	Diff line change
`@@ -340,6 +340,8 @@ void VFSFileImpl::flush()`
`340`	`340`	`return;`
`341`	`341`	`}`
`342`	`342`	`fflush(_f);`
	`343`	`+ // workaround for https://github.com/espressif/arduino-esp32/issues/1293`
	`344`	`+ fsync(fileno(_f));`
`343`	`345`	`}`
`344`	`346`
`345`	`347`	`bool VFSFileImpl::seek(uint32_t pos, SeekMode mode)`