From 67da0f3087193c6bad3755984aab800665e980aa Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Mon, 26 Oct 2020 13:38:05 -0400
Subject: [PATCH] Cygwin: AF_UNIX: peek_pipe: check for STATUS_BUFFER_OVERFLOW

Treat this the same as STATUS_SUCCESS.
---
 winsup/cygwin/fhandler_socket_unix.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/fhandler_socket_unix.cc b/winsup/cygwin/fhandler_socket_unix.cc
index 4dd0225f3..290f613cf 100644
--- a/winsup/cygwin/fhandler_socket_unix.cc
+++ b/winsup/cygwin/fhandler_socket_unix.cc
@@ -1152,9 +1152,12 @@ fhandler_socket_unix::peek_pipe (PFILE_PIPE_PEEK_BUFFER pbuf, ULONG psize,
       if (NT_SUCCESS (status))
 	status = io.Status;
     }
-  ret_len = (NT_SUCCESS (status)
-	     ? (io.Information - offsetof (FILE_PIPE_PEEK_BUFFER, Data))
-	     : 0);
+  if (NT_SUCCESS (status) || status == STATUS_BUFFER_OVERFLOW)
+    {
+      ret_len = io.Information - offsetof (FILE_PIPE_PEEK_BUFFER, Data);
+      return STATUS_SUCCESS;
+    }
+  ret_len = 0;
   return status;
 }