/*
- * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <lttng/trigger/trigger-internal.h>
#include <lttng/condition/condition-internal.h>
#include <lttng/action/action-internal.h>
+#include <common/credentials.h>
+#include <common/payload.h>
+#include <common/payload-view.h>
#include <common/error.h>
+#include <common/dynamic-array.h>
+#include <common/optional.h>
#include <assert.h>
+#include <inttypes.h>
LTTNG_HIDDEN
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:
goto end;
}
+ 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;
+
+ lttng_action_get(action);
trigger->action = action;
+
end:
return trigger;
}
+/*
+ * Note: the lack of reference counting 'get' on the condition object is normal.
+ * This API was exposed as such in 2.11. The client is not expected to call
+ * lttng_condition_destroy on the returned object.
+ */
struct lttng_condition *lttng_trigger_get_condition(
struct lttng_trigger *trigger)
{
return trigger ? trigger->condition : NULL;
}
+LTTNG_HIDDEN
+const struct lttng_condition *lttng_trigger_get_const_condition(
+ const struct lttng_trigger *trigger)
+{
+ return trigger->condition;
+}
+
+
+/*
+ * Note: the lack of reference counting 'get' on the action object is normal.
+ * This API was exposed as such in 2.11. The client is not expected to call
+ * lttng_action_destroy on the returned object.
+ */
struct lttng_action *lttng_trigger_get_action(
struct lttng_trigger *trigger)
{
return trigger ? trigger->action : NULL;
}
+LTTNG_HIDDEN
+const struct lttng_action *lttng_trigger_get_const_action(
+ const struct lttng_trigger *trigger)
+{
+ return trigger->action;
+}
+
+static void trigger_destroy_ref(struct urcu_ref *ref)
+{
+ struct lttng_trigger *trigger =
+ container_of(ref, struct lttng_trigger, ref);
+ struct lttng_action *action = lttng_trigger_get_action(trigger);
+ struct lttng_condition *condition =
+ lttng_trigger_get_condition(trigger);
+
+ assert(action);
+ assert(condition);
+
+ /* Release ownership. */
+ lttng_action_put(action);
+ lttng_condition_put(condition);
+
+ free(trigger->name);
+ free(trigger);
+}
+
void lttng_trigger_destroy(struct lttng_trigger *trigger)
{
- if (!trigger) {
- return;
+ 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;
}
- free(trigger);
+ return valid;
}
LTTNG_HIDDEN
-ssize_t lttng_trigger_create_from_buffer(
- const struct lttng_buffer_view *src_view,
- struct lttng_trigger **trigger)
+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;
struct lttng_condition *condition = NULL;
struct lttng_action *action = NULL;
const struct lttng_trigger_comm *trigger_comm;
- struct lttng_buffer_view condition_view;
- struct lttng_buffer_view action_view;
+ 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,
+ };
+ struct lttng_trigger *trigger = NULL;
+ const struct lttng_payload_view trigger_comm_view =
+ lttng_payload_view_from_view(
+ src_view, 0, sizeof(*trigger_comm));
+
+ if (!src_view || !_trigger) {
+ ret = -1;
+ goto end;
+ }
- if (!src_view || !trigger) {
+ if (!lttng_payload_view_is_valid(&trigger_comm_view)) {
+ /* Payload not large enough to contain the header. */
ret = -1;
goto end;
}
/* lttng_trigger_comm header */
- trigger_comm = (const struct lttng_trigger_comm *) src_view->data;
+ trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data;
+
+ /* Set the trigger's creds. */
+ if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) {
+ /* UID out of range for this platform. */
+ ret = -1;
+ goto end;
+ }
+
+ LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid);
+
offset += sizeof(*trigger_comm);
- condition_view = lttng_buffer_view_from_view(src_view, offset, -1);
+ 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 =
+ lttng_payload_view_from_view(
+ src_view, offset,
+ trigger_comm->name_length);
+
+ if (!lttng_payload_view_is_valid(&name_view)) {
+ ret = -1;
+ goto end;
+ }
+
+ 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 =
+ lttng_payload_view_from_view(
+ src_view, offset, -1);
+
+ condition_size = lttng_condition_create_from_payload(&condition_view,
+ &condition);
+ }
- /* struct lttng_condition */
- condition_size = lttng_condition_create_from_buffer(&condition_view,
- &condition);
if (condition_size < 0) {
ret = condition_size;
goto end;
}
+
offset += condition_size;
+ {
+ /* struct lttng_action */
+ struct lttng_payload_view action_view =
+ lttng_payload_view_from_view(
+ src_view, offset, -1);
+
+ action_size = lttng_action_create_from_payload(&action_view, &action);
+ }
- /* struct lttng_action */
- action_view = lttng_buffer_view_from_view(src_view, offset, -1);
- action_size = lttng_action_create_from_buffer(&action_view, &action);
if (action_size < 0) {
ret = action_size;
goto end;
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;
}
- *trigger = lttng_trigger_create(condition, action);
- if (!*trigger) {
+ trigger = lttng_trigger_create(condition, action);
+ if (!trigger) {
ret = -1;
goto error;
}
+
+ lttng_trigger_set_credentials(trigger, &creds);
+
+ /*
+ * The trigger object owns references to the action and condition
+ * objects.
+ */
+ lttng_condition_put(condition);
+ condition = NULL;
+
+ lttng_action_put(action);
+ action = NULL;
+
+ if (name) {
+ const enum lttng_trigger_status status =
+ lttng_trigger_set_name(trigger, name);
+
+ if (status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -1;
+ goto end;
+ }
+ }
+
+ /* 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;
-end:
- return ret;
+
error:
- lttng_condition_destroy(condition);
- lttng_action_destroy(action);
+ lttng_condition_put(condition);
+ lttng_action_put(action);
+end:
+ if (ret >= 0) {
+ *_trigger = trigger;
+ } else {
+ lttng_trigger_put(trigger);
+ }
+
return ret;
}
* for the detailed format.
*/
LTTNG_HIDDEN
-int lttng_trigger_serialize(struct lttng_trigger *trigger,
- struct lttng_dynamic_buffer *buf)
+int lttng_trigger_serialize(const struct lttng_trigger *trigger,
+ struct lttng_payload *payload)
{
int ret;
- size_t header_offset, size_before_payload;
- struct lttng_trigger_comm trigger_comm = { 0 };
+ 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);
- header_offset = buf->size;
- ret = lttng_dynamic_buffer_append(buf, &trigger_comm,
+ 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.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,
sizeof(trigger_comm));
if (ret) {
goto end;
}
- size_before_payload = buf->size;
- ret = lttng_condition_serialize(trigger->condition, buf);
+ 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;
}
- ret = lttng_action_serialize(trigger->action, buf);
+ ret = lttng_action_serialize(trigger->action, payload);
if (ret) {
goto end;
}
/* Update payload size. */
- header = (struct lttng_trigger_comm *) ((char *) buf->data + header_offset);
- header->length = buf->size - size_before_payload;
+ header = (typeof(header)) (payload->buffer.data + header_offset);
+ header->length = payload->buffer.size - size_before_payload;
end:
return ret;
}
+
+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;
+}
+
+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
+int lttng_trigger_generate_name(struct lttng_trigger *trigger,
+ uint64_t unique_id)
+{
+ int ret = 0;
+ char *generated_name = NULL;
+
+ ret = asprintf(&generated_name, "T%" PRIu64 "", unique_id);
+ if (ret < 0) {
+ ERR("Failed to generate trigger name");
+ ret = -1;
+ goto end;
+ }
+
+ ret = 0;
+ free(trigger->name);
+ trigger->name = generated_name;
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_get(struct lttng_trigger *trigger)
+{
+ urcu_ref_get(&trigger->ref);
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_put(struct lttng_trigger *trigger)
+{
+ if (!trigger) {
+ return;
+ }
+
+ 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
+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_borrow_mutable_at_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)
+{
+ return lttng_triggers_borrow_mutable_at_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 i, count;
+ size_t size_before_payload;
+ struct lttng_triggers_comm triggers_comm = {};
+ struct lttng_triggers_comm *header;
+ enum lttng_trigger_status status;
+ const size_t 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;
+
+ /* Placeholder header; updated at the end. */
+ ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm,
+ sizeof(triggers_comm));
+ if (ret) {
+ goto end;
+ }
+
+ size_before_payload = payload->buffer.size;
+
+ for (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, triggers_size = 0;
+ unsigned int i;
+ 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 (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);
+ ssize_t trigger_size;
+
+ trigger_size = lttng_trigger_create_from_payload(
+ &trigger_view, &trigger);
+ if (trigger_size < 0) {
+ ret = trigger_size;
+ goto error;
+ }
+
+ /* Transfer 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 &trigger->creds;
+}
+
+LTTNG_HIDDEN
+void lttng_trigger_set_credentials(struct lttng_trigger *trigger,
+ const struct lttng_credentials *creds)
+{
+ assert(creds);
+ trigger->creds = *creds;
+}
+
+enum lttng_trigger_status lttng_trigger_set_owner_uid(
+ struct lttng_trigger *trigger, uid_t uid)
+{
+ enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK;
+ const struct lttng_credentials creds = {
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(uid),
+ .gid = LTTNG_OPTIONAL_INIT_UNSET,
+ };
+
+ if (!trigger) {
+ ret = LTTNG_TRIGGER_STATUS_INVALID;
+ goto end;
+ }
+
+ /* Client-side validation only to report a clearer error. */
+ if (geteuid() != 0) {
+ ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED;
+ goto end;
+ }
+
+ lttng_trigger_set_credentials(trigger, &creds);
+
+end:
+ return ret;
+}
+
+enum lttng_trigger_status lttng_trigger_get_owner_uid(
+ 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;
+}
+
+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();
+ };
+}
projects / lttng-tools.git / blobdiff