--- /dev/null
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_UST_FD_H
+#define _LTTNG_UST_FD_H
+
+/*
+ * The fd tracker feature is part of the ABI and used by liblttng-ust-fd.
+ * However, some test code and documentation needs to be written before it is
+ * exposed to users with a public header.
+ */
+
+#include <stdio.h>
+
+void lttng_ust_init_fd_tracker(void);
+int lttng_ust_add_fd_to_tracker(int fd);
+void lttng_ust_delete_fd_from_tracker(int fd);
+void lttng_ust_lock_fd_tracker(void);
+void lttng_ust_unlock_fd_tracker(void);
+
+int lttng_ust_safe_close_fd(int fd, int (*close_cb)(int));
+int lttng_ust_safe_fclose_stream(FILE *stream, int (*fclose_cb)(FILE *stream));
+int lttng_ust_safe_closefrom_fd(int lowfd, int (*close_cb)(int));
+
+#endif /* _LTTNG_UST_FD_H */