[newlib-cygwin] Cygwin: select: don't set ready for exception on socket shutdown

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=caa78917b68a9f5cff65b22e0e53ebd53b2dc5c7

commit caa78917b68a9f5cff65b22e0e53ebd53b2dc5c7
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Apr 6 21:26:33 2021 +0200

    Cygwin: select: don't set ready for exception on socket shutdown
    
    So far select wrongly sets the descriptor as ready for exception
    when a shutdown occurs.  This is entirely non-standard.  Only set
    this bit on an out-of-band event.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/select.cc | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index 6e8586d17..956cd9bc1 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -1920,10 +1920,7 @@ fhandler_socket_wsock::select_write (select_stuff *ss)
   s->write_ready = saw_shutdown_write () || connect_state () == unconnected;
   s->write_selected = true;
   if (connect_state () != unconnected)
-    {
-      s->except_ready = saw_shutdown_write () || saw_shutdown_read ();
-      s->except_on_write = true;
-    }
+    s->except_on_write = true;
   return s;
 }
 
@@ -1938,8 +1935,6 @@ fhandler_socket_wsock::select_except (select_stuff *ss)
       s->cleanup = socket_cleanup;
     }
   s->peek = peek_socket;
-  /* FIXME: Is this right?  Should these be used as criteria for except? */
-  s->except_ready = saw_shutdown_write () || saw_shutdown_read ();
   s->except_selected = true;
   return s;
 }