[newlib-cygwin] Cygwin: default to O_BINARY in fhandler_base::reset_to_open_binmode()

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=543e39bb129ac77e29e3800a468100a754ad3d2a

commit 543e39bb129ac77e29e3800a468100a754ad3d2a
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Feb 19 18:12:37 2021 +0100

    Cygwin: default to O_BINARY in fhandler_base::reset_to_open_binmode()
    
    This only affects the very seldom bordercase of apps calling setmode(fd,
    0) on fhandlers not calling fhandler_base::set_open_status().  All
    fhandlers not calling set_open_status() are binary mode only, but the
    way reset_to_open_binmode worked, calling setmode(fd, 0) would have
    "reset" their open flags to O_TEXT accidentally.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/fhandler.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 5d095d384..12c45a5d7 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -274,7 +274,8 @@ class fhandler_base
   void reset_to_open_binmode ()
   {
     set_flags ((get_flags () & ~(O_TEXT | O_BINARY))
-	       | ((open_status.wbinary || open_status.rbinary)
+	       | (((open_status.wbinset ? open_status.wbinary : 1)
+		   || (open_status.rbinset ? open_status.rbinary : 1))
 		   ? O_BINARY : O_TEXT));
   }