--- /dev/null
+#ifndef BABELTRACE_GRAPH_PORT_INPUT_CONST_H
+#define BABELTRACE_GRAPH_PORT_INPUT_CONST_H
+
+/*
+ * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
+ * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/* For bt_port, bt_port_input, __BT_UPCAST_CONST */
+#include <babeltrace2/types.h>
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline
+const bt_port *bt_port_input_as_port_const(const bt_port_input *port_input)
+{
+ return __BT_UPCAST_CONST(bt_port, port_input);
+}
+
+extern void bt_port_input_get_ref(const bt_port_input *port_input);
+
+extern void bt_port_input_put_ref(const bt_port_input *port_input);
+
+#define BT_PORT_INPUT_PUT_REF_AND_RESET(_var) \
+ do { \
+ bt_port_input_put_ref(_var); \
+ (_var) = NULL; \
+ } while (0)
+
+#define BT_PORT_INPUT_MOVE_REF(_var_dst, _var_src) \
+ do { \
+ bt_port_input_put_ref(_var_dst); \
+ (_var_dst) = (_var_src); \
+ (_var_src) = NULL; \
+ } while (0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BABELTRACE_GRAPH_PORT_INPUT_CONST_H */