From b99a6607ba7ad6d571873c3fe19dce864c6e198e Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Sat, 8 Aug 2020 22:47:26 -0400
Subject: [PATCH] Use tcflush() in patty_kiss_tnc_new()

Use tcflush() to initialize TTY state in patty_kiss_tnc_new(), so that
no unexpected data causes KISS framing errors
---
 src/kiss.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/kiss.c b/src/kiss.c
index 30adf45..bdf0e43 100644
--- a/src/kiss.c
+++ b/src/kiss.c
@@ -143,6 +143,10 @@ patty_kiss_tnc *patty_kiss_tnc_new_fd(int fd) {
         if (tcsetattr(fd, TCSANOW, &tnc->attrs) < 0) {
             goto error_tcsetattr;
         }
+
+        if (tcflush(fd, TCIOFLUSH) < 0) {
+            goto error_tcflush;
+        }
     }
 
     tnc->fd      =  fd;
@@ -154,6 +158,7 @@ patty_kiss_tnc *patty_kiss_tnc_new_fd(int fd) {
 
     return tnc;
 
+error_tcflush:
 error_tcsetattr:
 error_tcgetattr:
 error_malloc_buf: