+/* Default trace output directory name */
+#define LTTNG_DEFAULT_TRACE_DIR_NAME "lttng-traces"
+
+/*
+ * Event symbol length. Copied from LTTng kernel ABI.
+ */
+#define LTTNG_SYMBOL_NAME_LEN 128
+
+/*
+ * Every lttng_event_* structure both apply to kernel event and user-space
+ * event.
+ */
+
+/*
+ * Domain type are the different possible tracers.
+ */
+enum lttng_domain_type {
+ LTTNG_DOMAIN_KERNEL = 1,
+ LTTNG_DOMAIN_UST = 2,
+ LTTNG_DOMAIN_UST_EXEC_NAME = 3,
+ LTTNG_DOMAIN_UST_PID = 4,
+ LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
+};
+
+/*
+ * Instrumentation type of tracing event.
+ */
+enum lttng_event_type {
+ LTTNG_EVENT_TRACEPOINT,
+ LTTNG_EVENT_PROBE,
+ LTTNG_EVENT_FUNCTION,
+ LTTNG_EVENT_FUNCTION_ENTRY,
+};
+
+/*
+ * LTTng consumer mode
+ */
+enum lttng_event_output {
+ LTTNG_EVENT_SPLICE = 0,
+ LTTNG_EVENT_MMAP = 1,
+};
+
+/* Event context possible type */
+enum lttng_event_context_type {
+ LTTNG_EVENT_CONTEXT_PID = 0,
+ LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
+ LTTNG_EVENT_CONTEXT_COMM = 2,
+ LTTNG_EVENT_CONTEXT_PRIO = 3,
+ LTTNG_EVENT_CONTEXT_NICE = 4,
+ LTTNG_EVENT_CONTEXT_VPID = 5,
+ LTTNG_EVENT_CONTEXT_TID = 6,
+ LTTNG_EVENT_CONTEXT_VTID = 7,
+ LTTNG_EVENT_CONTEXT_PPID = 8,
+ LTTNG_EVENT_CONTEXT_VPPID = 9,
+};
+
+enum lttng_calibrate_type {
+ LTTNG_CALIBRATE_FUNCTION = 0,
+};
+
+struct lttng_domain {
+ enum lttng_domain_type type;
+ union {
+ pid_t pid;
+ char exec_name[NAME_MAX];
+ } attr;
+};
+
+/* Perf counter attributes */
+struct lttng_event_perf_counter_ctx {
+ uint32_t type;
+ uint64_t config;
+ char name[LTTNG_SYMBOL_NAME_LEN];
+};
+
+/* Event/Channel context */
+struct lttng_event_context {
+ enum lttng_event_context_type ctx;
+ union {
+ struct lttng_event_perf_counter_ctx perf_counter;
+ } u;
+};
+
+/*
+ * Event probe.
+ *
+ * Either addr is used or symbol_name and offset.
+ */
+struct lttng_event_probe_attr {
+ uint64_t addr;
+
+ uint64_t offset;
+ char symbol_name[LTTNG_SYMBOL_NAME_LEN];
+};
+
+/*
+ * Function tracer
+ */
+struct lttng_event_function_attr {
+ char symbol_name[LTTNG_SYMBOL_NAME_LEN];
+};
+
+/*
+ * Generic lttng event
+ */
+struct lttng_event {
+ char name[LTTNG_SYMBOL_NAME_LEN];
+ enum lttng_event_type type;
+ uint32_t enabled;
+ /* Per event type configuration */
+ union {
+ struct lttng_event_probe_attr probe;
+ struct lttng_event_function_attr ftrace;
+ } attr;
+};
+