Adding upstream version 5.6.0.upstream/5.6.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/daemon/ffimodule.h b/daemon/ffimodule.h
new file mode 100644
index 0000000..beb1bf1
--- /dev/null
+++ b/daemon/ffimodule.h
@@ -0,0 +1,36 @@
+/*  Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ *  SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "lib/defines.h"
+#include "lib/layer.h"
+#include <lua.h>
+struct engine;
+struct kr_module;
+
+/**
+ * Register Lua module as a FFI module.
+ * This fabricates a standard module interface,
+ * that trampolines to the Lua module methods.
+ *
+ * @note Lua module is loaded in it's own coroutine,
+ *       so it's possible to yield and resume at arbitrary
+ *       places except deinit()
+ *
+ * @param  engine daemon engine
+ * @param  module prepared module
+ * @param  name   module name
+ * @return        0 or an error
+ */
+int ffimodule_register_lua(struct engine *engine, struct kr_module *module, const char *name);
+
+int ffimodule_init(lua_State *L);
+void ffimodule_deinit(lua_State *L);
+
+/** Static storage for faster passing of layer function parameters to lua callbacks.
+ *
+ * We don't need to declare it in a header, but let's give it visibility. */
+KR_EXPORT extern kr_layer_t kr_layer_t_static;
+