From 46cdfc570ddad8d2fb9ed283ca76ace217a106d5 Mon Sep 17 00:00:00 2001
From: JacobBarthelmeh <jacob@wolfssl.com>
Date: Sat, 3 Feb 2024 00:24:04 -0700
Subject: [PATCH] set pipes as non blocking before last read

---
 apps/wolfsshd/wolfsshd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/wolfsshd/wolfsshd.c b/apps/wolfsshd/wolfsshd.c
index 6b9c9e1d4..a7ef2f0a5 100644
--- a/apps/wolfsshd/wolfsshd.c
+++ b/apps/wolfsshd/wolfsshd.c
@@ -1606,11 +1606,15 @@ static int SHELL_Subsystem(WOLFSSHD_CONNECTION* conn, WOLFSSH* ssh,
     if (forcedCmd) {
         int readSz;
 
+        fcntl(stdoutPipe[0], F_SETFL, fcntl(stdoutPipe[0], F_GETFL)
+            | O_NONBLOCK);
         readSz = (int)read(stdoutPipe[0], shellBuffer, sizeof shellBuffer);
         if (readSz > 0) {
             wolfSSH_ChannelIdSend(ssh, shellChannelId, shellBuffer, readSz);
         }
 
+        fcntl(stderrPipe[0], F_SETFL, fcntl(stderrPipe[0], F_GETFL)
+            | O_NONBLOCK);
         readSz = (int)read(stderrPipe[0], shellBuffer, sizeof shellBuffer);
         if (readSz > 0) {
             wolfSSH_extended_data_send(ssh, shellBuffer, readSz);