server: Add get_sd and set_sd object operations to allow the security descriptor to be stored somewhere other than server memory, such as on disk.
diff --git a/server/signal.c b/server/signal.c
index c8120ac..912c6c6 100644
--- a/server/signal.c
+++ b/server/signal.c
@@ -70,6 +70,8 @@
     no_signal,                /* signal */
     no_get_fd,                /* get_fd */
     no_map_access,            /* map_access */
+    default_get_sd,           /* get_sd */
+    default_set_sd,           /* set_sd */
     no_lookup_name,           /* lookup_name */
     no_open_file,             /* open_file */
     no_close_handle,          /* close_handle */