Set error if the file buffer flushing fails on Windowsold/5.2

Change-Id: I58cf61540bc53e314988753a252cbc71003ce581
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/src/serialport/qserialport_win.cpp b/src/serialport/qserialport_win.cpp
index ffc8aa4..be4530a 100644
--- a/src/serialport/qserialport_win.cpp
+++ b/src/serialport/qserialport_win.cpp
@@ -313,7 +313,20 @@ bool QSerialPortPrivate::setRequestToSend(bool set)
 
 bool QSerialPortPrivate::flush()
 {
-    return startAsyncWrite() && ::FlushFileBuffers(handle);
+    Q_Q(QSerialPort);
+
+    bool returnValue = true;
+
+    if (!startAsyncWrite())
+        returnValue = false;
+
+    if (!::FlushFileBuffers(handle)) {
+        q->setError(decodeSystemError());
+        returnValue = false;
+    }
+
+    return returnValue;
+
 }
 
 bool QSerialPortPrivate::clear(QSerialPort::Directions directions)