diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index cd012c636..1285b795a 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2002-06-03  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_dsp.cc (fhandler_dev_dsp::open): Set errno to EACCES if
+	requested mode isn't supported.
+
 2002-06-03  Christopher Faylor  <cgf@redhat.com>
 
 	* fhandler.cc (fhandler_base::open): Don't set binmode if already set.
diff --git a/winsup/cygwin/fhandler_dsp.cc b/winsup/cygwin/fhandler_dsp.cc
index 6ea8f3cbd..907eb24e8 100644
--- a/winsup/cygwin/fhandler_dsp.cc
+++ b/winsup/cygwin/fhandler_dsp.cc
@@ -434,7 +434,10 @@ fhandler_dev_dsp::open (path_conv *, int flags, mode_t mode)
 {
   // currently we only support writing
   if ((flags & (O_WRONLY | O_RDONLY | O_RDWR)) != O_WRONLY)
-    return 0;
+    {
+      set_errno (EACCES);
+      return 0;
+    }
 
   set_flags (flags);