1 files changed, 60 insertions, 0 deletions
diff --git a/src/core/or/dos_sys.c b/src/core/or/dos_sys.c
new file mode 100644
index 0000000000..03a9ee9140
--- /dev/null
+++ b/src/core/or/dos_sys.c
@@ -0,0 +1,60 @@
+/* Copyright (c) 2021-2021, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file dos_sys.c
+ * @brief Subsystem definitions for DOS module.
+ **/
+
+#include "core/or/or.h"
+
+#include "lib/subsys/subsys.h"
+
+#include "core/or/dos_config.h"
+#include "core/or/dos_sys.h"
+
+#include "core/or/dos_options_st.h"
+
+static const dos_options_t *global_dos_options;
+
+static int
+subsys_dos_initialize(void)
+{
+  return 0;
+}
+
+static void
+subsys_dos_shutdown(void)
+{
+  global_dos_options = NULL;
+}
+
+const dos_options_t *
+dos_get_options(void)
+{
+  tor_assert(global_dos_options);
+  return global_dos_options;
+}
+
+static int
+dos_set_options(void *arg)
+{
+  dos_options_t *opts = arg;
+  global_dos_options = opts;
+  return 0;
+}
+
+const struct subsys_fns_t sys_dos = {
+  SUBSYS_DECLARE_LOCATION(),
+
+  .name = "dos",
+  .supported = true,
+  .level = DOS_SUBSYS_LEVEL,
+
+  .initialize = subsys_dos_initialize,
+  .shutdown = subsys_dos_shutdown,
+
+  /* Configuration Options. */
+  .options_format = &dos_options_fmt,
+  .set_options = dos_set_options,
+};