From a0506cb39e9b1cf67c454a2ccc9473b8cbcd5cd0 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 11 Jan 2021 22:40:40 +0100
Subject: [PATCH] Kernel: Only send SIGTTOU if TTY termios has TOSTOP flag

Fixes #4909
---
 Kernel/TTY/TTY.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/TTY/TTY.cpp b/Kernel/TTY/TTY.cpp
index b795966e6d7..4375eef40c2 100644
--- a/Kernel/TTY/TTY.cpp
+++ b/Kernel/TTY/TTY.cpp
@@ -103,7 +103,7 @@ KResultOr<size_t> TTY::read(FileDescription&, size_t, UserOrKernelBuffer& buffer
 
 KResultOr<size_t> TTY::write(FileDescription&, size_t, const UserOrKernelBuffer& buffer, size_t size)
 {
-    if (Process::current()->pgid() != pgid()) {
+    if (m_termios.c_lflag & TOSTOP && Process::current()->pgid() != pgid()) {
         [[maybe_unused]] auto rc = Process::current()->send_signal(SIGTTOU, nullptr);
         return KResult(-EINTR);
     }