-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 "http://lttng.org/xml/ns/lttng-mi"
+
+/* Default thread stack size; the default mandated by pthread_create(3) */
+#define DEFAULT_LTTNG_THREAD_STACK_SIZE 2097152
+
+#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_WORKING_DIRECTORY_ENV "LTTNG_RELAYD_WORKING_DIRECTORY"