From f1e83d938b09b23c7b2703f68a65435c86f63547 Mon Sep 17 00:00:00 2001
From: Jarrod Johnson <jjohnson2@lenovo.com>
Date: Thu, 14 Mar 2019 09:33:58 -0400
Subject: [PATCH] Add carrier detect to autocons sample

For genesis, not necessarily relevant, but may be
very relevant for OS behaviors in other contexts.
---
 misc/autocons.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/misc/autocons.py b/misc/autocons.py
index 5c5bf127..ebd13466 100644
--- a/misc/autocons.py
+++ b/misc/autocons.py
@@ -1,3 +1,4 @@
+import fcntl
 import os
 import struct
 import termios
@@ -46,6 +47,8 @@ def do_serial_config():
         currattr = termios.tcgetattr(ttyf)
         currattr[4:6] = [0, termiobaud[retval['speed']]]
         termios.tcsetattr(ttyf, termios.TCSANOW, currattr)
+    retval['connected'] = bool(struct.unpack('<I', fcntl.ioctl(
+        ttyf, termios.TIOCMGET, '\x00\x00\x00\x00'))[0] & termios.TIOCM_CAR)
     return retval