union {
struct {
const char **model_emf_uri;
- void (*event_notifier_callback)(void);
} ext;
char padding[LTTNG_UST_EVENT_DESC_PADDING];
} u;
LTTNG_UST_EVENT_TYPE_NOTIFIER = 1,
};
+/*
+ * IMPORTANT: this structure is part of the ABI between the probe and
+ * UST. Fields need to be only added at the end, never reordered, never
+ * removed.
+ *
+ * struct lttng_ust_event_common is the common ancestor of the various
+ * public event actions. Inheritance is done by composition: The parent
+ * has a pointer to its child, and the child has a pointer to its
+ * parent. Inheritance of those public structures is done by composition
+ * to ensure both parent and child structures can be extended.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
+ */
struct lttng_ust_event_common {
uint32_t struct_size; /* Size of this structure. */
struct lttng_ust_event_common_private *priv; /* Private event interface */
enum lttng_ust_event_type type;
+ void *child; /* Pointer to child, for inheritance by aggregation. */
+
int enabled;
int has_enablers_without_bytecode;
/* list of struct lttng_bytecode_runtime, sorted by seqnum */
struct cds_list_head filter_bytecode_runtime_head;
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
};
struct lttng_ust_event_recorder_private;
+/*
+ * IMPORTANT: this structure is part of the ABI between the probe and
+ * UST. Fields need to be only added at the end, never reordered, never
+ * removed.
+ *
+ * struct lttng_ust_event_recorder is the action for recording events
+ * into a ring buffer. It inherits from struct lttng_ust_event_common
+ * by composition to ensure both parent and child structure are
+ * extensible.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
+ */
struct lttng_ust_event_recorder {
uint32_t struct_size; /* Size of this structure. */
- struct lttng_ust_event_common *parent;
+ struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */
struct lttng_ust_event_recorder_private *priv; /* Private event record interface */
unsigned int id;
struct lttng_channel *chan;
struct lttng_ctx *ctx;
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
};
struct lttng_ust_event_notifier_private;
+/*
+ * IMPORTANT: this structure is part of the ABI between the probe and
+ * UST. Fields need to be only added at the end, never reordered, never
+ * removed.
+ *
+ * struct lttng_ust_event_notifier is the action for sending
+ * notifications. It inherits from struct lttng_ust_event_common
+ * by composition to ensure both parent and child structure are
+ * extensible.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
+ */
struct lttng_ust_event_notifier {
uint32_t struct_size; /* Size of this structure. */
- struct lttng_ust_event_common *parent;
+ struct lttng_ust_event_common *parent; /* Inheritance by aggregation. */
struct lttng_ust_event_notifier_private *priv; /* Private event notifier interface */
void (*notification_send)(struct lttng_ust_event_notifier *event_notifier,
const char *stack_data);
struct cds_list_head capture_bytecode_runtime_head;
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
};
struct lttng_enum {
* IMPORTANT: this structure is part of the ABI between the probe and
* UST. Fields need to be only added at the end, never reordered, never
* removed.
+ *
+ * The field @struct_size should be used to determine the size of the
+ * structure. It should be queried before using additional fields added
+ * at the end of the structure.
*/
struct lttng_session {
uint32_t struct_size; /* Size of this structure */
struct lttng_ust_session_private *priv; /* Private session interface */
int active; /* Is trace session active ? */
+
+ /* End of base ABI. Fields below should be used after checking struct_size. */
};
int lttng_probe_register(struct lttng_probe_desc *desc);