From c7c91488d15161ec5b6114b322cd050e403ad298 Mon Sep 17 00:00:00 2001
From: fangzhenwei <fangzhenwei@xiaomi.com>
Date: Tue, 9 Nov 2021 15:24:41 +0800
Subject: [PATCH] nuttx/pty: pass read nonblock flag to pipe

Signed-off-by: fangzhenwei <fangzhenwei@xiaomi.com>
---
 drivers/serial/pty.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index 78cfafeee6..497b95225a 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -876,7 +876,11 @@ static int pty_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
       case FIONBIO:
         {
-          ret = file_ioctl(&dev->pd_sink, cmd, arg);
+          ret = file_ioctl(&dev->pd_src, cmd, arg);
+          if (ret >= 0 || ret == -ENOTTY)
+            {
+              ret = file_ioctl(&dev->pd_sink, cmd, arg);
+            }
         }
         break;