From 9c927538ad81a9253c43509bcb7479998a50b7fa Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sat, 9 May 2020 12:30:51 +0200
Subject: [PATCH] Kernel: ioctl(TCSETSF) on a TTY should flush input

This is where we end up when calling tcsetattr() with TCSAFLUSH.
This fixes vttest not accepting the first keystroke as input.
---
 Kernel/TTY/TTY.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Kernel/TTY/TTY.cpp b/Kernel/TTY/TTY.cpp
index 0ec94e2d70..f2215a7782 100644
--- a/Kernel/TTY/TTY.cpp
+++ b/Kernel/TTY/TTY.cpp
@@ -326,6 +326,8 @@ int TTY::ioctl(FileDescription&, unsigned request, unsigned arg)
         if (!process.validate_read(tp, sizeof(termios)))
             return -EFAULT;
         set_termios(*tp);
+        if (request == TCSETSF)
+            flush_input();
         return 0;
     case TIOCGWINSZ:
         ws = reinterpret_cast<winsize*>(arg);