From 6b46ddfcb47713647da95cd5d681620b21982b71 Mon Sep 17 00:00:00 2001
From: James Gartrell <jgartrel@gmail.com>
Date: Mon, 16 Aug 2021 16:17:41 -0700
Subject: [PATCH] PosixSerialPort: Call tcdrain() to write serial data

---
 src/PosixSerialPort.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PosixSerialPort.cpp b/src/PosixSerialPort.cpp
index 4ca79549..a3e2168c 100644
--- a/src/PosixSerialPort.cpp
+++ b/src/PosixSerialPort.cpp
@@ -296,7 +296,7 @@ PosixSerialPort::put(int c)
 void
 PosixSerialPort::flush()
 {
-    fsync(_devfd);
+    tcdrain(_devfd);
 }
 
 bool