Index: file_stream.c
===================================================================
RCS file: /cvsroot/mailutils//mailutils/mailbox/file_stream.c,v
retrieving revision 1.22
diff -u -r1.22 file_stream.c
--- file_stream.c	2001/05/07 04:36:40	1.22
+++ file_stream.c	2001/06/03 14:34:55
@@ -244,7 +244,9 @@
     }
 
   /* Map the flags to the system equivalent.  */
-  if (flags & MU_STREAM_WRITE)
+  if (flags & MU_STREAM_WRITE && flags & MU_STREAM_READ)
+    return EINVAL;
+  else if (flags & MU_STREAM_WRITE)
     flg = O_WRONLY;
   else if (flags & MU_STREAM_RDWR)
     flg = O_RDWR;
Index: mapfile_stream.c
===================================================================
RCS file: /cvsroot/mailutils//mailutils/mailbox/mapfile_stream.c,v
retrieving revision 1.12
diff -u -r1.12 mapfile_stream.c
--- mapfile_stream.c	2001/04/24 07:20:28	1.12
+++ mapfile_stream.c	2001/06/03 14:34:56
@@ -279,7 +279,9 @@
       mfs->fd = -1;
     }
   /* Map the flags to the system equivalent */
-  if (flags & MU_STREAM_WRITE)
+  if (flags & MU_STREAM_WRITE && flags & MU_STREAM_READ)
+    return EINVAL;
+  else if (flags & MU_STREAM_WRITE)
     {
       mflag = PROT_WRITE;
       flg = O_WRONLY;