-extern size_t default_channel_subbuf_size;
-extern size_t default_metadata_subbuf_size;
-extern size_t default_ust_pid_channel_subbuf_size;
-extern size_t default_ust_uid_channel_subbuf_size;
-extern size_t default_kernel_channel_subbuf_size;
+/* Default runas worker name */
+#define DEFAULT_RUN_AS_WORKER_NAME "lttng-runas"
+
+/* Default LTTng MI XML namespace. */
+#define DEFAULT_LTTNG_MI_NAMESPACE "https://lttng.org/xml/ns/lttng-mi"
+
+/* Default thread stack size; the default mandated by pthread_create(3) */
+#define DEFAULT_LTTNG_THREAD_STACK_SIZE 2097152
+
+/* Default maximal size of message notification channel message payloads. */
+#define DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE 65536
+
+/* Default maximal size of trace archive location. */
+#define DEFAULT_MAX_TRACE_ARCHIVE_LOCATION_PAYLOAD_SIZE 65536
+
+/* Default maximal size of message notification channel message payloads. */
+#define DEFAULT_CLIENT_MAX_QUEUED_NOTIFICATIONS_COUNT 100
+
+
+#define DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV "LTTNG_RELAYD_TCP_KEEP_ALIVE"
+#define DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV "LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME"
+#define DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV "LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT"
+#define DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV "LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL"
+#define DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV "LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD"
+#define DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV "LTTNG_RELAYD_DISALLOW_CLEAR"
+
+#define DEFAULT_LTTNG_RELAYD_WORKING_DIRECTORY_ENV "LTTNG_RELAYD_WORKING_DIRECTORY"
+
+/*
+ * Name of the intermediate directory used to rename the trace chunk of a
+ * session's first rotation.
+ */
+#define DEFAULT_CHUNK_TMP_OLD_DIRECTORY ".tmp_old_chunk"
+#define DEFAULT_CHUNK_TMP_NEW_DIRECTORY ".tmp_new_chunk"
+#define DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "archives"
+#define DEFAULT_UNLINKED_FILES_DIRECTORY ".unlinked"
+
+/*
+ * Default timer value in usec for the rotate pending polling check on the
+ * relay when a rotation has completed on the consumer.
+ */
+#define DEFAULT_ROTATE_PENDING_TIMER CONFIG_DEFAULT_ROTATE_PENDING_TIMER