From a57ad3e77a5b4760fc161406c411cd9d5084c39a Mon Sep 17 00:00:00 2001
From: Takashi Yano <takashi.yano@nifty.ne.jp>
Date: Thu, 16 Sep 2021 20:50:54 +0900
Subject: [PATCH 1/3] Cygwin: close_all_files: Do not duplicate stderr for
 write pipe.

- Currently, the stderr handle is duplicated in close_all_files().
  This interferes the handle counting for detecting closure of read
  pipe, which is introduced by commit f79a4611. This patch stops
  duplicating stderr handle if it is write pipe.
---
 winsup/cygwin/syscalls.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 11af079cb..a3ffe3532 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -95,7 +95,7 @@ close_all_files (bool norelease)
       if (cfd >= 0)
 	{
 	  debug_only_printf ("closing fd %d", i);
-	  if (i == 2)
+	  if (i == 2 && cfd->get_dev () != FH_PIPEW)
 	    DuplicateHandle (GetCurrentProcess (), cfd->get_output_handle (),
 			     GetCurrentProcess (), &h,
 			     0, false, DUPLICATE_SAME_ACCESS);
-- 
2.33.0