#include <common/macros.h>
#include <lttng/condition/condition.h>
#include <lttng/action/action-internal.h>
+#include <lttng/action/group-internal.h>
+#include <lttng/domain-internal.h>
#include <lttng/notification/notification-internal.h>
#include <lttng/condition/condition-internal.h>
#include <lttng/condition/buffer-usage-internal.h>
#define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP)
#define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT)
+/* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */
+#define MAX_CAPTURE_SIZE (PIPE_BUF)
+
enum lttng_object_type {
LTTNG_OBJECT_TYPE_UNKNOWN,
LTTNG_OBJECT_TYPE_NONE,
struct cds_list_head node;
};
-/*
- * Facilities to carry the different notifications type in the action processing
- * code path.
- */
-struct lttng_event_notifier_notification {
- union {
- struct lttng_ust_event_notifier_notification *ust;
- struct lttng_kernel_event_notifier_notification *kernel;
- } notification;
- uint64_t token;
- enum lttng_domain_type type;
-};
-
struct channel_state_sample {
struct channel_key key;
struct cds_lfht_node channel_state_ht_node;
enum client_transmission_status transmission_status,
struct notification_thread_state *state);
+static
+int handle_one_event_notifier_notification(
+ struct notification_thread_state *state,
+ int pipe, enum lttng_domain_type domain);
+
static
void free_lttng_trigger_ht_element_rcu(struct rcu_head *node);
return !strcmp(session_info->name, name);
}
+static
+const char *notification_command_type_str(
+ enum notification_thread_command_type type)
+{
+ switch (type) {
+ case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER:
+ return "REGISTER_TRIGGER";
+ case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER:
+ return "UNREGISTER_TRIGGER";
+ case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL:
+ return "ADD_CHANNEL";
+ case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL:
+ return "REMOVE_CHANNEL";
+ case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING:
+ return "SESSION_ROTATION_ONGOING";
+ case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED:
+ return "SESSION_ROTATION_COMPLETED";
+ case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE:
+ return "ADD_TRACER_EVENT_SOURCE";
+ case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE:
+ return "REMOVE_TRACER_EVENT_SOURCE";
+ case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS:
+ return "LIST_TRIGGERS";
+ case NOTIFICATION_COMMAND_TYPE_QUIT:
+ return "QUIT";
+ case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE:
+ return "CLIENT_COMMUNICATION_UPDATE";
+ default:
+ abort();
+ }
+}
+
/*
* Match trigger based on name and credentials only.
* Name duplication is NOT allowed for the same uid.
DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain",
channel_name, session_name, channel_key_int,
- channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space");
+ lttng_domain_type_str(channel_domain));
CDS_INIT_LIST_HEAD(&trigger_list);
struct channel_info *channel_info;
DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain",
- channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space");
+ channel_key, lttng_domain_type_str(domain));
rcu_read_lock();
return ret;
}
+static
+int drain_event_notifier_notification_pipe(
+ struct notification_thread_state *state,
+ int pipe, enum lttng_domain_type domain)
+{
+ struct lttng_poll_event events = {0};
+ int ret;
+
+ ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC);
+ if (ret < 0) {
+ ERR("[notification-thread] Error creating lttng_poll_event");
+ goto end;
+ }
+
+ ret = lttng_poll_add(&events, pipe, LPOLLIN);
+ if (ret < 0) {
+ ERR("[notification-thread] Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d",
+ pipe);
+ goto end;
+ }
+
+ while (true) {
+ /*
+ * Continue to consume notifications as long as there are new
+ * ones coming in. The tracer has been asked to stop producing
+ * them.
+ *
+ * LPOLLIN is explicitly checked since LPOLLHUP is implicitly
+ * monitored (on Linux, at least) and will be returned when
+ * the pipe is closed but empty.
+ */
+ ret = lttng_poll_wait_interruptible(&events, 0);
+ if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) {
+ /* No more notification to be read on this pipe. */
+ ret = 0;
+ goto end;
+ } else if (ret < 0) {
+ PERROR("Failed on lttng_poll_wait_interruptible() call");
+ ret = -1;
+ goto end;
+ }
+
+ ret = handle_one_event_notifier_notification(state, pipe, domain);
+ if (ret) {
+ ERR("[notification-thread] Error consuming an event notifier notification from pipe: fd = %d",
+ pipe);
+ }
+ }
+end:
+ lttng_poll_clean(&events);
+ return ret;
+}
+
static
int handle_notification_thread_command_remove_tracer_event_source(
struct notification_thread_state *state,
source_element->is_fd_in_poll_set = false;
+ ret = drain_event_notifier_notification_pipe(state, tracer_event_source_fd,
+ source_element->domain);
+ if (ret) {
+ ERR("[notification-thread] Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s",
+ tracer_event_source_fd,
+ lttng_domain_type_str(source_element->domain));
+ cmd_result = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ /*
+ * The drain_event_notifier_notification_pipe() call might have read
+ * data from an fd that we received in event in the latest _poll_wait()
+ * call. Make sure the thread call poll_wait() again to ensure we have
+ * a clean state.
+ */
+ state->restart_poll = true;
+
end:
free(source_element);
*_cmd_result = cmd_result;
ret = evaluate_session_condition_for_client(condition, state,
&evaluation, &object_uid,
&object_gid);
+ LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid);
+ LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid);
break;
case LTTNG_OBJECT_TYPE_CHANNEL:
ret = evaluate_channel_condition_for_client(condition, state,
&evaluation, &object_uid,
&object_gid);
+ LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid);
+ LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid);
break;
case LTTNG_OBJECT_TYPE_NONE:
ret = 0;
goto error_put_client_list;
}
- LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid);
- LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid);
-
DBG("Newly registered trigger's condition evaluated to %s",
evaluation ? "true" : "false");
if (!evaluation) {
struct notification_thread_command, cmd_list_node);
cds_list_del(&cmd->cmd_list_node);
pthread_mutex_unlock(&handle->cmd_queue.lock);
+
+ DBG("[notification-thread] Received `%s` command",
+ notification_command_type_str(cmd->type));
switch (cmd->type) {
case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER:
- DBG("[notification-thread] Received register trigger command");
ret = handle_notification_thread_command_register_trigger(state,
cmd->parameters.register_trigger.trigger,
&cmd->reply_code);
break;
case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER:
- DBG("[notification-thread] Received unregister trigger command");
ret = handle_notification_thread_command_unregister_trigger(
state,
cmd->parameters.unregister_trigger.trigger,
&cmd->reply_code);
break;
case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL:
- DBG("[notification-thread] Received add channel command");
ret = handle_notification_thread_command_add_channel(
state,
cmd->parameters.add_channel.session.name,
&cmd->reply_code);
break;
case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL:
- DBG("[notification-thread] Received remove channel command");
ret = handle_notification_thread_command_remove_channel(
state, cmd->parameters.remove_channel.key,
cmd->parameters.remove_channel.domain,
break;
case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING:
case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED:
- DBG("[notification-thread] Received session rotation %s command",
- cmd->type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING ?
- "ongoing" : "completed");
ret = handle_notification_thread_command_session_rotation(
state,
cmd->type,
break;
}
case NOTIFICATION_COMMAND_TYPE_QUIT:
- DBG("[notification-thread] Received quit command");
cmd->reply_code = LTTNG_OK;
ret = 1;
goto end;
return ret;
}
-int handle_notification_thread_event_notification(struct notification_thread_state *state,
- int notification_pipe_read_fd,
- enum lttng_domain_type domain)
+static
+struct lttng_event_notifier_notification *recv_one_event_notifier_notification(
+ int notification_pipe_read_fd, enum lttng_domain_type domain)
{
int ret;
- struct lttng_ust_event_notifier_notification ust_notification;
- struct lttng_kernel_event_notifier_notification kernel_notification;
- struct cds_lfht_node *node;
- struct cds_lfht_iter iter;
- struct notification_trigger_tokens_ht_element *element;
- enum lttng_action_type action_type;
- const struct lttng_action *action;
- struct lttng_event_notifier_notification notification;
+ uint64_t token;
+ struct lttng_event_notifier_notification *notification = NULL;
+ char *capture_buffer = NULL;
+ size_t capture_buffer_size;
void *reception_buffer;
size_t reception_size;
- notification.type = domain;
+ struct lttng_ust_abi_event_notifier_notification ust_notification;
+ struct lttng_kernel_event_notifier_notification kernel_notification;
+ /* Init lttng_event_notifier_notification */
switch(domain) {
case LTTNG_DOMAIN_UST:
reception_buffer = (void *) &ust_notification;
reception_size = sizeof(ust_notification);
- notification.notification.ust = &ust_notification;
break;
case LTTNG_DOMAIN_KERNEL:
reception_buffer = (void *) &kernel_notification;
reception_size = sizeof(kernel_notification);
- notification.notification.kernel = &kernel_notification;
break;
default:
abort();
switch(domain) {
case LTTNG_DOMAIN_UST:
- notification.token = ust_notification.token;
+ token = ust_notification.token;
+ capture_buffer_size = ust_notification.capture_buf_size;
break;
case LTTNG_DOMAIN_KERNEL:
- notification.token = kernel_notification.token;
+ token = kernel_notification.token;
+ capture_buffer_size = 0;
break;
default:
abort();
}
+ if (capture_buffer_size == 0) {
+ capture_buffer = NULL;
+ goto skip_capture;
+ }
+
+ if (capture_buffer_size > MAX_CAPTURE_SIZE) {
+ ERR("[notification-thread] Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes",
+ capture_buffer_size, MAX_CAPTURE_SIZE);
+ goto end;
+ }
+
+ capture_buffer = zmalloc(capture_buffer_size);
+ if (!capture_buffer) {
+ ERR("[notification-thread] Failed to allocate capture buffer");
+ goto end;
+ }
+
+ /* Fetch additional payload (capture). */
+ ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size);
+ if (ret != capture_buffer_size) {
+ ERR("[notification-thread] Failed to read from event source pipe (fd = %i)",
+ notification_pipe_read_fd);
+ goto end;
+ }
+
+skip_capture:
+ notification = lttng_event_notifier_notification_create(token, domain,
+ capture_buffer, capture_buffer_size);
+ if (notification == NULL) {
+ goto end;
+ }
+
+ /*
+ * Ownership transfered to the lttng_event_notifier_notification object.
+ */
+ capture_buffer = NULL;
+
+end:
+ free(capture_buffer);
+ return notification;
+}
+
+static
+int dispatch_one_event_notifier_notification(struct notification_thread_state *state,
+ struct lttng_event_notifier_notification *notification)
+{
+ struct cds_lfht_node *node;
+ struct cds_lfht_iter iter;
+ struct notification_trigger_tokens_ht_element *element;
+ enum lttng_trigger_status trigger_status;
+ struct lttng_evaluation *evaluation = NULL;
+ enum action_executor_status executor_status;
+ struct notification_client_list *client_list = NULL;
+ const char *trigger_name;
+ int ret;
+ unsigned int capture_count = 0;
+
/* Find triggers associated with this token. */
rcu_read_lock();
cds_lfht_lookup(state->trigger_tokens_ht,
- hash_key_u64(¬ification.token, lttng_ht_seed),
- match_trigger_token, ¬ification.token, &iter);
+ hash_key_u64(¬ification->tracer_token, lttng_ht_seed),
+ match_trigger_token, ¬ification->tracer_token, &iter);
node = cds_lfht_iter_get_node(&iter);
- if (caa_likely(!node)) {
+ if (caa_unlikely(!node)) {
/*
- * This is not an error, slow consumption of the pipe can lead
- * to situations where a trigger is removed but we still get
- * tracer notification matching to a previous trigger.
+ * This is not an error, slow consumption of the tracer
+ * notifications can lead to situations where a trigger is
+ * removed but we still get tracer notifications matching a
+ * trigger that no longer exists.
*/
ret = 0;
goto end_unlock;
struct notification_trigger_tokens_ht_element,
node);
- action = lttng_trigger_get_const_action(element->trigger);
- action_type = lttng_action_get_type(action);
- DBG("Received message from tracer event source: event source fd = %d, token = %" PRIu64 ", action type = '%s'",
- notification_pipe_read_fd, notification.token,
- lttng_action_type_string(action_type));
+ if (!lttng_trigger_should_fire(element->trigger)) {
+ ret = 0;
+ goto end_unlock;
+ }
- /* TODO: Perform actions */
+ lttng_trigger_fire(element->trigger);
- ret = 0;
+ trigger_status = lttng_trigger_get_name(element->trigger, &trigger_name);
+ assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+ if (lttng_condition_event_rule_get_capture_descriptor_count(
+ lttng_trigger_get_const_condition(element->trigger),
+ &capture_count) != LTTNG_CONDITION_STATUS_OK) {
+ ERR("Failed to get capture count");
+ ret = -1;
+ goto end;
+ }
+
+ if (!notification->capture_buffer && capture_count != 0) {
+ ERR("Expected capture but capture buffer is null");
+ ret = -1;
+ goto end;
+ }
+
+ evaluation = lttng_evaluation_event_rule_create(
+ container_of(lttng_trigger_get_const_condition(
+ element->trigger),
+ struct lttng_condition_event_rule,
+ parent),
+ trigger_name,
+ notification->capture_buffer,
+ notification->capture_buf_size, false);
+
+ if (evaluation == NULL) {
+ ERR("[notification-thread] Failed to create event rule hit evaluation while creating and enqueuing action executor job");
+ ret = -1;
+ goto end_unlock;
+ }
+ client_list = get_client_list_from_condition(state,
+ lttng_trigger_get_const_condition(element->trigger));
+ executor_status = action_executor_enqueue(state->executor,
+ element->trigger, evaluation, NULL, client_list);
+ switch (executor_status) {
+ case ACTION_EXECUTOR_STATUS_OK:
+ ret = 0;
+ break;
+ case ACTION_EXECUTOR_STATUS_OVERFLOW:
+ {
+ struct notification_client_list_element *client_list_element,
+ *tmp;
+
+ /*
+ * Not a fatal error; this is expected and simply means the
+ * executor has too much work queued already.
+ */
+ ret = 0;
+
+ /* No clients subscribed to notifications for this trigger. */
+ if (!client_list) {
+ break;
+ }
+
+ /* Warn clients that a notification (or more) was dropped. */
+ pthread_mutex_lock(&client_list->lock);
+ cds_list_for_each_entry_safe(client_list_element, tmp,
+ &client_list->list, node) {
+ enum client_transmission_status transmission_status;
+ struct notification_client *client =
+ client_list_element->client;
+
+ pthread_mutex_lock(&client->lock);
+ ret = client_notification_overflow(client);
+ if (ret) {
+ /* Fatal error. */
+ goto next_client;
+ }
+
+ transmission_status =
+ client_flush_outgoing_queue(client);
+ ret = client_handle_transmission_status(
+ client, transmission_status, state);
+ if (ret) {
+ /* Fatal error. */
+ goto next_client;
+ }
+next_client:
+ pthread_mutex_unlock(&client->lock);
+ if (ret) {
+ break;
+ }
+ }
+
+ pthread_mutex_unlock(&client_list->lock);
+ break;
+ }
+ case ACTION_EXECUTOR_STATUS_INVALID:
+ case ACTION_EXECUTOR_STATUS_ERROR:
+ /* Fatal error, shut down everything. */
+ ERR("Fatal error encoutered while enqueuing action to the action executor");
+ ret = -1;
+ goto end_unlock;
+ default:
+ /* Unhandled error. */
+ abort();
+ }
end_unlock:
+ notification_client_list_put(client_list);
rcu_read_unlock();
end:
return ret;
}
+static
+int handle_one_event_notifier_notification(
+ struct notification_thread_state *state,
+ int pipe, enum lttng_domain_type domain)
+{
+ int ret = 0;
+ struct lttng_event_notifier_notification *notification = NULL;
+
+ notification = recv_one_event_notifier_notification(pipe, domain);
+ if (notification == NULL) {
+ /* Reception failed, don't consider it fatal. */
+ ERR("[notification-thread] Error receiving an event notifier notification from tracer: fd = %i, domain = %s",
+ pipe, lttng_domain_type_str(domain));
+ goto end;
+ }
+
+ ret = dispatch_one_event_notifier_notification(state, notification);
+ if (ret) {
+ ERR("[notification-thread] Error dispatching an event notifier notification from tracer: fd = %i, domain = %s",
+ pipe, lttng_domain_type_str(domain));
+ goto end;
+ }
+
+end:
+ lttng_event_notifier_notification_destroy(notification);
+ return ret;
+}
+
+int handle_notification_thread_event_notification(struct notification_thread_state *state,
+ int pipe, enum lttng_domain_type domain)
+{
+ return handle_one_event_notifier_notification(state, pipe, domain);
+}
+
int handle_notification_thread_channel_sample(
struct notification_thread_state *state, int pipe,
enum lttng_domain_type domain)
*/
DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain",
latest_sample.key.key,
- domain == LTTNG_DOMAIN_KERNEL ? "kernel" :
- "user space");
+ lttng_domain_type_str(domain));
goto end_unlock;
}
channel_info = caa_container_of(node, struct channel_info,
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