+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_PROCNAME = 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,
+ LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10,
+};
+
+enum lttng_calibrate_type {
+ LTTNG_CALIBRATE_FUNCTION = 0,
+};
+
+#define LTTNG_DOMAIN_PADDING1 16
+#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
+struct lttng_domain {
+ enum lttng_domain_type type;
+ char padding[LTTNG_DOMAIN_PADDING1];
+
+ union {
+ pid_t pid;
+ char exec_name[NAME_MAX];
+ char padding[LTTNG_DOMAIN_PADDING2];
+ } attr;
+};
+
+/* Perf counter attributes */
+#define LTTNG_PERF_EVENT_PADDING1 16
+struct lttng_event_perf_counter_ctx {
+ uint32_t type;
+ uint64_t config;
+ char name[LTTNG_SYMBOL_NAME_LEN];
+
+ char padding[LTTNG_PERF_EVENT_PADDING1];
+};
+
+/* Event/Channel context */
+#define LTTNG_EVENT_CONTEXT_PADDING1 16
+#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
+struct lttng_event_context {
+ enum lttng_event_context_type ctx;
+ char padding[LTTNG_EVENT_CONTEXT_PADDING1];
+
+ union {
+ struct lttng_event_perf_counter_ctx perf_counter;
+ char padding[LTTNG_EVENT_CONTEXT_PADDING2];
+ } u;
+};
+
+/*
+ * Event probe.
+ *
+ * Either addr is used or symbol_name and offset.
+ */
+#define LTTNG_EVENT_PROBE_PADDING1 16
+struct lttng_event_probe_attr {
+ uint64_t addr;
+
+ uint64_t offset;
+ char symbol_name[LTTNG_SYMBOL_NAME_LEN];
+
+ char padding[LTTNG_EVENT_PROBE_PADDING1];
+};
+
+/*
+ * Function tracer
+ */
+#define LTTNG_EVENT_FUNCTION_PADDING1 16
+struct lttng_event_function_attr {
+ char symbol_name[LTTNG_SYMBOL_NAME_LEN];
+
+ char padding[LTTNG_EVENT_FUNCTION_PADDING1];
+};
+
+/*
+ * Generic lttng event
+ */
+#define LTTNG_EVENT_PADDING1 16
+#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
+struct lttng_event {
+ enum lttng_event_type type;
+ char name[LTTNG_SYMBOL_NAME_LEN];
+
+ enum lttng_loglevel_type loglevel_type;
+ int loglevel;
+
+ uint32_t enabled;
+ pid_t pid;
+
+ char padding[LTTNG_EVENT_PADDING1];
+
+ /* Per event type configuration */
+ union {
+ struct lttng_event_probe_attr probe;
+ struct lttng_event_function_attr ftrace;
+
+ char padding[LTTNG_EVENT_PADDING2];
+ } attr;
+};
+
+/*
+ * Tracer channel attributes. For both kernel and user-space.
+ */
+#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
+struct lttng_channel_attr {
+ int overwrite; /* 1: overwrite, 0: discard */
+ uint64_t subbuf_size; /* bytes */
+ uint64_t num_subbuf; /* power of 2 */
+ unsigned int switch_timer_interval; /* usec */
+ unsigned int read_timer_interval; /* usec */
+ enum lttng_event_output output; /* splice, mmap */
+
+ char padding[LTTNG_CHANNEL_ATTR_PADDING1];
+};
+
+/*
+ * Channel information structure. For both kernel and user-space.
+ */
+#define LTTNG_CHANNEL_PADDING1 16
+struct lttng_channel {
+ char name[LTTNG_SYMBOL_NAME_LEN];
+ uint32_t enabled;
+ struct lttng_channel_attr attr;
+
+ char padding[LTTNG_CHANNEL_PADDING1];
+};
+
+#define LTTNG_CALIBRATE_PADDING1 16
+struct lttng_calibrate {
+ enum lttng_calibrate_type type;
+
+ char padding[LTTNG_CALIBRATE_PADDING1];
+};
+
+/*
+ * Basic session information.
+ *
+ * This is an 'output data' meaning that it only comes *from* the session
+ * daemon *to* the lttng client. It's basically a 'human' representation of
+ * tracing entities (here a session).
+ */
+#define LTTNG_SESSION_PADDING1 16