From 88e871b13ee22dea95e8bce5dde1ae0cd4182dcf Mon Sep 17 00:00:00 2001
From: fangzhenwei <fangzhenwei@xiaomi.com>
Date: Thu, 25 Nov 2021 13:32:52 +0800
Subject: [PATCH] nuttx/pty: pty FIONBIO return -ENOTTY when pipe_ioctl return
 OK

Signed-off-by: fangzhenwei <fangzhenwei@xiaomi.com>
---
 drivers/serial/pty.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index 497b95225a..5a3bb849ba 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -881,6 +881,13 @@ static int pty_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
             {
               ret = file_ioctl(&dev->pd_sink, cmd, arg);
             }
+
+          /* Let the default handler set O_NONBLOCK flags for us. */
+
+          if (ret >= 0)
+            {
+              ret = -ENOTTY;
+            }
         }
         break;