SoW-2020-0002: Trace Hit Counters: trigger error reporting integration
[lttng-tools.git] / src / common / trigger.c
index 2ef77b2360a2bf8ab1ea80cdf513da2b9d46ce2b..77f40af194bbe5fa764a9016ad53a766894e0a17 100644 (file)
@@ -7,16 +7,32 @@
 
 #include <lttng/trigger/trigger-internal.h>
 #include <lttng/condition/condition-internal.h>
+#include <lttng/condition/event-rule-internal.h>
+#include <lttng/condition/event-rule.h>
+#include <lttng/condition/buffer-usage.h>
+#include <lttng/event-rule/event-rule-internal.h>
+#include <lttng/event-expr-internal.h>
 #include <lttng/action/action-internal.h>
 #include <common/credentials.h>
 #include <common/payload.h>
 #include <common/payload-view.h>
+#include <lttng/domain.h>
 #include <common/error.h>
+#include <common/dynamic-array.h>
 #include <common/optional.h>
 #include <assert.h>
+#include <inttypes.h>
 
+static void destroy_lttng_condition_event_rule_capture_bytecode_element(void *ptr)
+{
+       struct lttng_condition_event_rule_capture_bytecode_element *element =
+                       ptr;
+       lttng_event_expr_destroy(element->expression);
+       free(element->bytecode);
+       free(element);
+}
 LTTNG_HIDDEN
-bool lttng_trigger_validate(struct lttng_trigger *trigger)
+bool lttng_trigger_validate(const struct lttng_trigger *trigger)
 {
        bool valid;
 
@@ -25,6 +41,11 @@ bool lttng_trigger_validate(struct lttng_trigger *trigger)
                goto end;
        }
 
+       if (!trigger->creds.uid.is_set) {
+               valid = false;
+               goto end;
+       }
+
        valid = lttng_condition_validate(trigger->condition) &&
                        lttng_action_validate(trigger->action);
 end:
@@ -48,12 +69,19 @@ struct lttng_trigger *lttng_trigger_create(
 
        urcu_ref_init(&trigger->ref);
 
+       trigger->firing_policy.type = LTTNG_TRIGGER_FIRE_EVERY_N;
+       trigger->firing_policy.threshold = 1;
+       lttng_trigger_set_error_count(trigger, 0);
+
        lttng_condition_get(condition);
        trigger->condition = condition;
 
        lttng_action_get(action);
        trigger->action = action;
 
+       lttng_dynamic_pointer_array_init(&trigger->capture_bytecode_set,
+                       destroy_lttng_condition_event_rule_capture_bytecode_element);
+
 end:
        return trigger;
 }
@@ -69,11 +97,10 @@ struct lttng_condition *lttng_trigger_get_condition(
        return trigger ? trigger->condition : NULL;
 }
 
-LTTNG_HIDDEN
 const struct lttng_condition *lttng_trigger_get_const_condition(
                const struct lttng_trigger *trigger)
 {
-       return trigger->condition;
+       return trigger ? trigger->condition : NULL;
 }
 
 
@@ -88,11 +115,10 @@ struct lttng_action *lttng_trigger_get_action(
        return trigger ? trigger->action : NULL;
 }
 
-LTTNG_HIDDEN
 const struct lttng_action *lttng_trigger_get_const_action(
                const struct lttng_trigger *trigger)
 {
-       return trigger->action;
+       return trigger ? trigger->action : NULL;
 }
 
 static void trigger_destroy_ref(struct urcu_ref *ref)
@@ -103,6 +129,8 @@ static void trigger_destroy_ref(struct urcu_ref *ref)
        struct lttng_condition *condition =
                        lttng_trigger_get_condition(trigger);
 
+       lttng_dynamic_pointer_array_reset(&trigger->capture_bytecode_set);
+
        assert(action);
        assert(condition);
 
@@ -110,6 +138,7 @@ static void trigger_destroy_ref(struct urcu_ref *ref)
        lttng_action_put(action);
        lttng_condition_put(condition);
 
+       free(trigger->name);
        free(trigger);
 }
 
@@ -118,15 +147,41 @@ void lttng_trigger_destroy(struct lttng_trigger *trigger)
        lttng_trigger_put(trigger);
 }
 
+static bool is_firing_policy_valid(enum lttng_trigger_firing_policy_type policy)
+{
+       bool valid = false;
+
+       switch (policy) {
+       case LTTNG_TRIGGER_FIRE_EVERY_N:
+       case LTTNG_TRIGGER_FIRE_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,
                struct lttng_trigger **trigger)
 {
-       ssize_t ret, offset = 0, condition_size, action_size;
+       ssize_t ret, offset = 0, condition_size, action_size, name_size = 0;
+       enum lttng_trigger_status status;
        struct lttng_condition *condition = NULL;
        struct lttng_action *action = NULL;
        const struct lttng_trigger_comm *trigger_comm;
+       const char *name = NULL;
+       uint64_t firing_threshold;
+       int64_t error_count;
+       enum lttng_trigger_firing_policy_type firing_policy;
+       struct lttng_credentials creds = {
+               .uid = LTTNG_OPTIONAL_INIT_UNSET,
+               .gid = LTTNG_OPTIONAL_INIT_UNSET,
+       };
 
        if (!src_view || !trigger) {
                ret = -1;
@@ -135,7 +190,35 @@ ssize_t lttng_trigger_create_from_payload(
 
        /* lttng_trigger_comm header */
        trigger_comm = (typeof(trigger_comm)) src_view->buffer.data;
+
+       /* Get the trigger creds */
+       LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid);
+
        offset += sizeof(*trigger_comm);
+
+       firing_policy = trigger_comm->policy_type;
+       if (!is_firing_policy_valid(firing_policy)) {
+               ret =-1;
+               goto end;
+       }
+
+       firing_threshold = trigger_comm->policy_threshold;
+       error_count = trigger_comm->error_count;
+       if (trigger_comm->name_length != 0) {
+               /* Name */
+               struct lttng_payload_view name_view =
+                               lttng_payload_view_from_view(
+                                               src_view, offset, trigger_comm->name_length);
+
+               name = name_view.buffer.data;
+               if (!lttng_buffer_view_contains_string(&name_view.buffer, name, trigger_comm->name_length)){
+                       ret = -1;
+                       goto end;
+               }
+               offset += trigger_comm->name_length;
+               name_size = trigger_comm->name_length;
+       }
+
        {
                /* struct lttng_condition */
                struct lttng_payload_view condition_view =
@@ -168,7 +251,7 @@ ssize_t lttng_trigger_create_from_payload(
        offset += action_size;
 
        /* Unexpected size of inner-elements; the buffer is corrupted. */
-       if ((ssize_t) trigger_comm->length != condition_size + action_size) {
+       if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) {
                ret = -1;
                goto error;
        }
@@ -179,6 +262,8 @@ ssize_t lttng_trigger_create_from_payload(
                goto error;
        }
 
+       lttng_trigger_set_credentials(*trigger, &creds);
+
        /*
         * The trigger object owns references to the action and condition
         * objects.
@@ -189,6 +274,22 @@ ssize_t lttng_trigger_create_from_payload(
        lttng_action_put(action);
        action = NULL;
 
+       if (name) {
+               status = lttng_trigger_set_name(*trigger, name);
+               if (status != LTTNG_TRIGGER_STATUS_OK) {
+                       ret = -1;
+                       goto end;
+               }
+       }
+
+       status = lttng_trigger_set_firing_policy(*trigger, firing_policy, firing_threshold);
+       if (status != LTTNG_TRIGGER_STATUS_OK) {
+               ret = -1;
+               goto end;
+       }
+
+       lttng_trigger_set_error_count(*trigger, error_count);
+
        ret = offset;
 
 error:
@@ -203,13 +304,30 @@ end:
  * for the detailed format.
  */
 LTTNG_HIDDEN
-int lttng_trigger_serialize(struct lttng_trigger *trigger,
+int lttng_trigger_serialize(const struct lttng_trigger *trigger,
                struct lttng_payload *payload)
 {
        int ret;
-       size_t header_offset, size_before_payload;
+       size_t header_offset, size_before_payload, size_name;
        struct lttng_trigger_comm trigger_comm = {};
        struct lttng_trigger_comm *header;
+       const struct lttng_credentials *creds = NULL;
+
+       creds = lttng_trigger_get_credentials(trigger);
+       assert(creds);
+
+       trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid);
+
+       if (trigger->name != NULL) {
+               size_name = strlen(trigger->name) + 1;
+       } else {
+               size_name = 0;
+       }
+
+       trigger_comm.name_length = size_name;
+       trigger_comm.policy_type = (uint8_t) trigger->firing_policy.type;
+       trigger_comm.policy_threshold = (uint64_t) trigger->firing_policy.threshold;
+       trigger_comm.error_count = (int64_t) lttng_trigger_get_error_count(trigger);
 
        header_offset = payload->buffer.size;
        ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm,
@@ -219,6 +337,14 @@ int lttng_trigger_serialize(struct lttng_trigger *trigger,
        }
 
        size_before_payload = payload->buffer.size;
+
+       /* Trigger name */
+       ret = lttng_dynamic_buffer_append(
+                       &payload->buffer, trigger->name, size_name);
+       if (ret) {
+               goto end;
+       }
+
        ret = lttng_condition_serialize(trigger->condition, payload);
        if (ret) {
                goto end;
@@ -236,6 +362,118 @@ end:
        return ret;
 }
 
+enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, const char* name)
+{
+       char *name_copy = NULL;
+       enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK;
+
+       if (!trigger || !name ||
+                       strlen(name) == 0) {
+               status = LTTNG_TRIGGER_STATUS_INVALID;
+               goto end;
+       }
+
+       name_copy = strdup(name);
+       if (!name_copy) {
+               status = LTTNG_TRIGGER_STATUS_ERROR;
+               goto end;
+       }
+
+       free(trigger->name);
+
+       trigger->name = name_copy;
+       name_copy = NULL;
+end:
+       return status;
+}
+
+enum lttng_trigger_status lttng_trigger_get_name(
+               const struct lttng_trigger *trigger, const char **name)
+{
+       enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK;
+
+       if (!trigger || !name) {
+               status = LTTNG_TRIGGER_STATUS_INVALID;
+               goto end;
+       }
+
+       if (!trigger->name) {
+               status = LTTNG_TRIGGER_STATUS_UNSET;
+       }
+
+       *name = trigger->name;
+end:
+       return status;
+}
+
+LTTNG_HIDDEN
+int lttng_trigger_assign_name(struct lttng_trigger *dst,
+               const struct lttng_trigger *src)
+{
+       int ret = 0;
+       enum lttng_trigger_status status;
+
+       status = lttng_trigger_set_name(dst, src->name);
+       if (status != LTTNG_TRIGGER_STATUS_OK) {
+               ret = -1;
+               ERR("Failed to set name for trigger");
+               goto end;
+       }
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, uint64_t token)
+{
+       assert(trigger);
+       LTTNG_OPTIONAL_SET(&trigger->tracer_token, token);
+}
+
+LTTNG_HIDDEN
+uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger)
+{
+       assert(trigger);
+
+       return LTTNG_OPTIONAL_GET(trigger->tracer_token);
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_set_error_counter_index(struct lttng_trigger *trigger,
+               uint64_t error_counter_index)
+{
+       assert(trigger);
+       LTTNG_OPTIONAL_SET(&trigger->error_counter_index, error_counter_index);
+}
+
+LTTNG_HIDDEN
+uint64_t lttng_trigger_get_error_counter_index(
+               const struct lttng_trigger *trigger)
+{
+       assert(trigger);
+
+       return LTTNG_OPTIONAL_GET(trigger->error_counter_index);
+}
+
+LTTNG_HIDDEN
+int lttng_trigger_generate_name(struct lttng_trigger *trigger, uint64_t offset)
+{
+       int ret = 0;
+       char *generated_name = NULL;
+
+       ret = asprintf(&generated_name, "T%" PRIu64 "", offset);
+       if (ret < 0) {
+               ERR("Failed to generate trigger name");
+               ret = -1;
+               goto end;
+       }
+
+       free(trigger->name);
+       trigger->name = generated_name;
+end:
+       return ret;
+}
+
 LTTNG_HIDDEN
 void lttng_trigger_get(struct lttng_trigger *trigger)
 {
@@ -252,18 +490,516 @@ void lttng_trigger_put(struct lttng_trigger *trigger)
        urcu_ref_put(&trigger->ref , trigger_destroy_ref);
 }
 
+static void delete_trigger_array_element(void *ptr)
+{
+       struct lttng_trigger *trigger = ptr;
+       lttng_trigger_put(trigger);
+}
+
+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.
+        */
+       if (!lttng_condition_is_equal(a->condition, b->condition)) {
+               return false;
+       }
+
+       if (!lttng_action_is_equal(a->action, b->action)) {
+               return false;
+       }
+
+       if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a),
+                       lttng_trigger_get_credentials(b))) {
+               return false;
+       }
+
+       return true;
+}
+
+LTTNG_HIDDEN
+struct lttng_triggers *lttng_triggers_create(void)
+{
+       struct lttng_triggers *triggers = NULL;
+
+       triggers = zmalloc(sizeof(*triggers));
+       if (!triggers) {
+               goto end;
+       }
+
+       lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element);
+
+end:
+       return triggers;
+}
+
+LTTNG_HIDDEN
+struct lttng_trigger *lttng_triggers_get_pointer_of_index(
+               const struct lttng_triggers *triggers, unsigned int index)
+{
+       struct lttng_trigger *trigger = NULL;
+       assert(triggers);
+       if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) {
+               goto end;
+       }
+
+       trigger = (struct lttng_trigger *)
+                       lttng_dynamic_pointer_array_get_pointer(
+                                       &triggers->array, index);
+end:
+       return trigger;
+}
+
+LTTNG_HIDDEN
+int lttng_triggers_add(
+               struct lttng_triggers *triggers, struct lttng_trigger *trigger)
+{
+       int ret;
+
+       assert(triggers);
+       assert(trigger);
+
+       lttng_trigger_get(trigger);
+
+       ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger);
+       if (ret) {
+               lttng_trigger_put(trigger);
+       }
+
+       return ret;
+}
+
+const struct lttng_trigger *lttng_triggers_get_at_index(
+               const struct lttng_triggers *triggers, unsigned int index)
+{
+       assert(triggers);
+       return lttng_triggers_get_pointer_of_index(triggers, index);
+}
+
+enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count)
+{
+       enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK;
+
+       if (!triggers || !count) {
+               status = LTTNG_TRIGGER_STATUS_INVALID;
+               goto end;
+       }
+
+       *count = lttng_dynamic_pointer_array_get_count(&triggers->array);
+end:
+       return status;
+}
+
+void lttng_triggers_destroy(struct lttng_triggers *triggers)
+{
+       if (!triggers) {
+               return;
+       }
+
+       lttng_dynamic_pointer_array_reset(&triggers->array);
+       free(triggers);
+}
+
+int lttng_triggers_serialize(const struct lttng_triggers *triggers,
+               struct lttng_payload *payload)
+{
+       int ret;
+       unsigned int count;
+       size_t header_offset, size_before_payload;
+       struct lttng_triggers_comm triggers_comm = {};
+       struct lttng_triggers_comm *header;
+       enum lttng_trigger_status status;
+
+       header_offset = payload->buffer.size;
+
+       status = lttng_triggers_get_count(triggers, &count);
+       if (status != LTTNG_TRIGGER_STATUS_OK) {
+               ret = LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       triggers_comm.count = count;
+
+       ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm,
+                       sizeof(triggers_comm));
+       if (ret) {
+               goto end;
+       }
+
+       size_before_payload = payload->buffer.size;
+
+       for (int i = 0; i < count; i++) {
+               const struct lttng_trigger *trigger =
+                               lttng_triggers_get_at_index(triggers, i);
+               assert(trigger);
+
+               ret = lttng_trigger_serialize(trigger, payload);
+               if (ret) {
+                       goto end;
+               }
+       }
+
+       /* Update payload size. */
+       header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset);
+       header->length = payload->buffer.size - size_before_payload;
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_triggers_create_from_payload(
+               struct lttng_payload_view *src_view,
+               struct lttng_triggers **triggers)
+{
+       ssize_t ret, offset = 0, trigger_size, triggers_size = 0;
+       const struct lttng_triggers_comm *triggers_comm;
+       struct lttng_triggers *local_triggers = NULL;
+
+       if (!src_view || !triggers) {
+               ret = -1;
+               goto error;
+       }
+
+       /* lttng_trigger_comms header */
+       triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data;
+       offset += sizeof(*triggers_comm);
+
+       local_triggers = lttng_triggers_create();
+       if (!local_triggers) {
+               ret = -1;
+               goto error;
+       }
+
+       for (int i = 0; i < triggers_comm->count; i++) {
+               struct lttng_trigger *trigger = NULL;
+               struct lttng_payload_view trigger_view =
+                       lttng_payload_view_from_view(src_view, offset, -1);
+               trigger_size = lttng_trigger_create_from_payload(&trigger_view,
+                               &trigger);
+               if (trigger_size  < 0) {
+                       ret = trigger_size;
+                       goto error;
+               }
+
+               /* Pass ownership of the trigger to the collection */
+               ret = lttng_triggers_add(local_triggers, trigger);
+               lttng_trigger_put(trigger);
+               if (ret < 0) {
+                       ret = -1;
+                       goto error;
+               }
+
+               offset += trigger_size;
+               triggers_size += trigger_size;
+       }
+
+       /* Unexpected size of inner-elements; the buffer is corrupted. */
+       if ((ssize_t) triggers_comm->length != triggers_size) {
+               ret = -1;
+               goto error;
+       }
+
+       /* Pass ownership to caller */
+       *triggers = local_triggers;
+       local_triggers = NULL;
+
+       ret = offset;
+error:
+
+       lttng_triggers_destroy(local_triggers);
+       return ret;
+}
+
 LTTNG_HIDDEN
 const struct lttng_credentials *lttng_trigger_get_credentials(
                const struct lttng_trigger *trigger)
 {
-       return LTTNG_OPTIONAL_GET_PTR(trigger->creds);
+       return &trigger->creds;
 }
 
 LTTNG_HIDDEN
-void lttng_trigger_set_credentials(
-               struct lttng_trigger *trigger,
+void lttng_trigger_set_credentials(struct lttng_trigger *trigger,
                const struct lttng_credentials *creds)
 {
        assert(creds);
-       LTTNG_OPTIONAL_SET(&trigger->creds, *creds);
+       trigger->creds = *creds;
+}
+
+enum lttng_trigger_status lttng_trigger_set_user_identity(
+               struct lttng_trigger *trigger, uid_t uid)
+{
+       enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK;
+       struct lttng_credentials creds = {
+               .uid = LTTNG_OPTIONAL_INIT_UNSET,
+               .gid = LTTNG_OPTIONAL_INIT_UNSET,
+       };
+
+       if (!trigger) {
+               ret = LTTNG_TRIGGER_STATUS_INVALID;
+               goto end;
+       }
+
+       if (geteuid() != 0) {
+               ret = LTTNG_TRIGGER_STATUS_EPERM;
+               goto end;
+       }
+
+       LTTNG_OPTIONAL_SET(&creds.uid, uid);
+
+       lttng_trigger_set_credentials(trigger, &creds);
+
+end:
+       return ret;
+}
+
+enum lttng_trigger_status lttng_trigger_get_user_identity(
+               const struct lttng_trigger *trigger, uid_t *uid)
+{
+       enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK;
+       const struct lttng_credentials *creds = NULL;
+
+       if (!trigger || !uid ) {
+               ret = LTTNG_TRIGGER_STATUS_INVALID;
+               goto end;
+       }
+
+       if (!trigger->creds.uid.is_set ) {
+               ret = LTTNG_TRIGGER_STATUS_UNSET;
+               goto end;
+       }
+
+       creds = lttng_trigger_get_credentials(trigger);
+       *uid = lttng_credentials_get_uid(creds);
+
+end:
+       return ret;
+}
+
+LTTNG_HIDDEN
+uint64_t lttng_trigger_get_error_count(
+               const struct lttng_trigger *trigger)
+{
+       return LTTNG_OPTIONAL_GET(trigger->error_count);
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_set_error_count(
+               struct lttng_trigger *trigger,
+               uint64_t error_count)
+{
+       LTTNG_OPTIONAL_SET(&trigger->error_count, error_count);
+}
+
+enum lttng_trigger_status lttng_trigger_set_firing_policy(
+               struct lttng_trigger *trigger,
+               enum lttng_trigger_firing_policy_type 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_type *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)
+{
+       assert(trigger);
+       bool ready_to_fire = false;
+
+       switch (trigger->firing_policy.type) {
+       case LTTNG_TRIGGER_FIRE_EVERY_N:
+               if (trigger->firing_policy.current_count < trigger->firing_policy.threshold) {
+                       ready_to_fire = true;
+               }
+               break;
+       case LTTNG_TRIGGER_FIRE_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_FIRE_EVERY_N:
+               if (trigger->firing_policy.current_count == trigger->firing_policy.threshold) {
+                       trigger->firing_policy.current_count = 0;
+               }
+               break;
+       case LTTNG_TRIGGER_FIRE_ONCE_AFTER_N:
+                       /*
+                        * TODO: deactivate the trigger condition on
+                        * remove any work overhead on the
+                        * traced application or kernel since the trigger will
+                        * never fire again.
+                        */
+               break;
+       default:
+               abort();
+       };
+}
+
+LTTNG_HIDDEN
+enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction(
+               const struct lttng_trigger *trigger)
+{
+       enum lttng_domain_type type = LTTNG_DOMAIN_NONE;
+       const struct lttng_event_rule *event_rule;
+       enum lttng_condition_status c_status;
+       enum lttng_condition_type c_type;
+
+       assert(trigger);
+       assert(trigger->condition);
+       c_type = lttng_condition_get_type(trigger->condition);
+       if (c_type == LTTNG_CONDITION_TYPE_UNKNOWN) {
+               assert(0);
+       }
+
+       switch (c_type) {
+       case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
+       case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
+       case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
+               type = LTTNG_DOMAIN_NONE;
+               break;
+       case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT:
+               c_status = lttng_condition_event_rule_get_rule(
+                               trigger->condition, &event_rule);
+               if (c_status != LTTNG_CONDITION_STATUS_OK) {
+                       /* The condition object is invalid */
+                       assert(0);
+               }
+
+               type = lttng_event_rule_get_domain_type(event_rule);
+               break;
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
+       case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
+               c_status = lttng_condition_buffer_usage_get_domain_type(
+                               trigger->condition, &type);
+               if (c_status != LTTNG_CONDITION_STATUS_OK) {
+                       /* The condition object is invalid */
+                       assert(0);
+               }
+               break;
+       default:
+               type = LTTNG_DOMAIN_NONE;
+               break;
+       }
+
+       return type;
+}
+
+LTTNG_HIDDEN
+struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger)
+{
+       int ret;
+       struct lttng_payload copy_buffer;
+       struct lttng_trigger *copy = NULL;
+
+       lttng_payload_init(&copy_buffer);
+
+       ret = lttng_trigger_serialize(trigger, &copy_buffer);
+       if (ret < 0) {
+               goto end;
+       }
+
+       {
+               struct lttng_payload_view view =
+                               lttng_payload_view_from_payload(
+                                               &copy_buffer, 0, -1);
+               ret = lttng_trigger_create_from_payload(
+                               &view, &copy);
+               if (ret < 0) {
+                       copy = NULL;
+                       goto end;
+               }
+       }
+
+end:
+       lttng_payload_reset(&copy_buffer);
+       return copy;
+}
+
+LTTNG_HIDDEN
+unsigned int lttng_trigger_get_capture_bytecode_count(
+               const struct lttng_trigger *trigger)
+{
+       unsigned int count = 0;
+       if (!trigger) {
+               goto end;
+       }
+
+       count = lttng_dynamic_pointer_array_get_count(
+                       &trigger->capture_bytecode_set);
+
+end:
+       return count;
+}
+
+LTTNG_HIDDEN
+const struct lttng_bytecode *
+lttng_trigger_get_capture_bytecode_at_index(
+               const struct lttng_trigger *trigger, unsigned int index)
+{
+       struct lttng_condition_event_rule_capture_bytecode_element *element = NULL;
+       struct lttng_bytecode *bytecode = NULL;
+
+       element = lttng_dynamic_pointer_array_get_pointer(
+                       &trigger->capture_bytecode_set, index);
+
+       if (element == NULL) {
+               goto end;
+       }
+       bytecode = element->bytecode;
+end:
+       return bytecode;
 }
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