From a776a0ce26abfdf5de9b94746818dfce176ab215 Mon Sep 17 00:00:00 2001
From: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date: Fri, 15 Jan 2021 18:26:31 +0900
Subject: [PATCH] Cygwin: pty: Set input_available_event only for cygwin pipe.

- cat exits immediately in the following senario.
    1) Execute env CYGWIN=disable_pcon script
    2) Execute cmd.exe
    3) Execute cat in cmd.exe.
  This is caused by setting input_available_event for the pipe for
  non-cygwin app. This patch fixes the issue.
---
 winsup/cygwin/fhandler_tty.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 29870c779..473c0c968 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -386,7 +386,8 @@ fhandler_pty_master::accept_input ()
 	}
     }
 
-  SetEvent (input_available_event);
+  if (write_to == get_output_handle ())
+    SetEvent (input_available_event);
   ReleaseMutex (input_mutex);
   return ret;
 }
-- 
2.43.5