X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Ftrigger.c;h=8c43fdbd8aaa8aa7f7ad1fda253ea8701c7f751c;hp=e69e72e076267be0b7b6290b9032cc11b941caa1;hb=5c504c41e4d470012cb98c849aa82086d1ba1bde;hpb=6808ef55e595f2cb28e8c0dafe5dff3e0faaa742

diff --git a/src/common/trigger.c b/src/common/trigger.c
index e69e72e07..8c43fdbd8 100644
--- a/src/common/trigger.c
+++ b/src/common/trigger.c
@@ -55,6 +55,9 @@ struct lttng_trigger *lttng_trigger_create(
 
 	urcu_ref_init(&trigger->ref);
 
+	trigger->firing_policy.type = LTTNG_TRIGGER_FIRING_POLICY_EVERY_N;
+	trigger->firing_policy.threshold = 1;
+
 	lttng_condition_get(condition);
 	trigger->condition = condition;
 
@@ -126,6 +129,23 @@ void lttng_trigger_destroy(struct lttng_trigger *trigger)
 	lttng_trigger_put(trigger);
 }
 
+static bool is_firing_policy_valid(enum lttng_trigger_firing_policy policy)
+{
+	bool valid = false;
+
+	switch (policy) {
+	case LTTNG_TRIGGER_FIRING_POLICY_EVERY_N:
+	case LTTNG_TRIGGER_FIRING_POLICY_ONCE_AFTER_N:
+		valid = true;
+		break;
+	default:
+		valid = false;
+		break;
+	}
+
+	return valid;
+}
+
 LTTNG_HIDDEN
 ssize_t lttng_trigger_create_from_payload(
 		struct lttng_payload_view *src_view,
@@ -136,6 +156,8 @@ ssize_t lttng_trigger_create_from_payload(
 	struct lttng_action *action = NULL;
 	const struct lttng_trigger_comm *trigger_comm;
 	const char *name = NULL;
+	uint64_t firing_policy_threshold;
+	enum lttng_trigger_firing_policy firing_policy;
 	struct lttng_credentials creds = {
 		.uid = LTTNG_OPTIONAL_INIT_UNSET,
 		.gid = LTTNG_OPTIONAL_INIT_UNSET,
@@ -170,6 +192,13 @@ ssize_t lttng_trigger_create_from_payload(
 
 	offset += sizeof(*trigger_comm);
 
+	firing_policy = trigger_comm->firing_policy_type;
+	if (!is_firing_policy_valid(firing_policy)) {
+		ret =-1;
+		goto end;
+	}
+
+	firing_policy_threshold = trigger_comm->firing_policy_threshold;
 	if (trigger_comm->name_length != 0) {
 		/* Name. */
 		const struct lttng_payload_view name_view =
@@ -258,13 +287,26 @@ ssize_t lttng_trigger_create_from_payload(
 		}
 	}
 
+	/* Set the policy. */
+	{
+		const enum lttng_trigger_status status =
+				lttng_trigger_set_firing_policy(trigger,
+						firing_policy,
+						firing_policy_threshold);
+
+		if (status != LTTNG_TRIGGER_STATUS_OK) {
+			ret = -1;
+			goto end;
+		}
+	}
+
 	ret = offset;
 
 error:
 	lttng_condition_put(condition);
 	lttng_action_put(action);
 end:
-	if (ret == 0) {
+	if (ret >= 0) {
 		*_trigger = trigger;
 	} else {
 		lttng_trigger_put(trigger);
@@ -299,6 +341,8 @@ int lttng_trigger_serialize(const struct lttng_trigger *trigger,
 	}
 
 	trigger_comm.name_length = size_name;
+	trigger_comm.firing_policy_type = (uint8_t) trigger->firing_policy.type;
+	trigger_comm.firing_policy_threshold = (uint64_t) trigger->firing_policy.threshold;
 
 	header_offset = payload->buffer.size;
 	ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm,
@@ -337,6 +381,14 @@ LTTNG_HIDDEN
 bool lttng_trigger_is_equal(
 		const struct lttng_trigger *a, const struct lttng_trigger *b)
 {
+	if (a->firing_policy.type != b->firing_policy.type) {
+		return false;
+	}
+
+	if (a->firing_policy.threshold != b->firing_policy.threshold) {
+		return false;
+	}
+
 	/*
 	 * Name is not taken into account since it is cosmetic only.
 	 */
@@ -738,3 +790,94 @@ enum lttng_trigger_status lttng_trigger_get_owner_uid(
 end:
 	return ret;
 }
+
+enum lttng_trigger_status lttng_trigger_set_firing_policy(
+		struct lttng_trigger *trigger,
+		enum lttng_trigger_firing_policy policy_type,
+		uint64_t threshold)
+{
+	enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK;
+	assert(trigger);
+
+	if (threshold < 1) {
+		ret = LTTNG_TRIGGER_STATUS_INVALID;
+		goto end;
+	}
+
+	trigger->firing_policy.type = policy_type;
+	trigger->firing_policy.threshold = threshold;
+
+end:
+	return ret;
+}
+
+enum lttng_trigger_status lttng_trigger_get_firing_policy(
+		const struct lttng_trigger *trigger,
+		enum lttng_trigger_firing_policy *policy_type,
+		uint64_t *threshold)
+{
+	enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK;
+
+	if (!trigger || !policy_type || !threshold) {
+		status = LTTNG_TRIGGER_STATUS_INVALID;
+		goto end;
+	}
+
+	*policy_type = trigger->firing_policy.type;
+	*threshold = trigger->firing_policy.threshold;
+
+end:
+	return status;
+}
+
+LTTNG_HIDDEN
+bool lttng_trigger_should_fire(const struct lttng_trigger *trigger)
+{
+	bool ready_to_fire = false;
+
+	assert(trigger);
+
+	switch (trigger->firing_policy.type) {
+	case LTTNG_TRIGGER_FIRING_POLICY_EVERY_N:
+		if (trigger->firing_policy.current_count < trigger->firing_policy.threshold) {
+			ready_to_fire = true;
+		}
+		break;
+	case LTTNG_TRIGGER_FIRING_POLICY_ONCE_AFTER_N:
+		if (trigger->firing_policy.current_count < trigger->firing_policy.threshold) {
+			ready_to_fire = true;
+		}
+		break;
+	default:
+		abort();
+	};
+
+	return ready_to_fire;
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_fire(struct lttng_trigger *trigger)
+{
+	assert(trigger);
+
+	trigger->firing_policy.current_count++;
+
+	switch (trigger->firing_policy.type) {
+	case LTTNG_TRIGGER_FIRING_POLICY_EVERY_N:
+		if (trigger->firing_policy.current_count == trigger->firing_policy.threshold) {
+			trigger->firing_policy.current_count = 0;
+		}
+
+		break;
+	case LTTNG_TRIGGER_FIRING_POLICY_ONCE_AFTER_N:
+		/*
+		 * TODO:
+		 * As an optimisation, deactivate the trigger condition and
+		 * remove any checks in the traced application or kernel since
+		 * the trigger will never fire again.
+		 */
+		break;
+	default:
+		abort();
+	};
+}