}
}
+static void increment_extended_len(const char *filter_expression,
+ size_t *extended_len)
+{
+ *extended_len += sizeof(struct lttcomm_event_extended_header);
+
+ if (filter_expression) {
+ *extended_len += strlen(filter_expression) + 1;
+ }
+}
+
+static void append_extended_info(const char *filter_expression,
+ void **extended_at)
+{
+ struct lttcomm_event_extended_header extended_header;
+ size_t filter_len = 0;
+
+ if (filter_expression) {
+ filter_len = strlen(filter_expression) + 1;
+ }
+
+ extended_header.filter_len = filter_len;
+ memcpy(*extended_at, &extended_header, sizeof(extended_header));
+ *extended_at += sizeof(extended_header);
+ memcpy(*extended_at, filter_expression, filter_len);
+ *extended_at += filter_len;
+}
+
/*
* Create a list of agent domain events.
*
* Return number of events in list on success or else a negative value.
*/
static int list_lttng_agent_events(struct agent *agt,
- struct lttng_event **events)
+ struct lttng_event **events, size_t *total_size)
{
int i = 0, ret = 0;
unsigned int nb_event = 0;
struct agent_event *event;
struct lttng_event *tmp_events;
struct lttng_ht_iter iter;
+ size_t extended_len = 0;
+ void *extended_at;
assert(agt);
assert(events);
rcu_read_unlock();
if (nb_event == 0) {
ret = nb_event;
+ *total_size = 0;
goto error;
}
- tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
+ /* Compute required extended infos size */
+ extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
+
+ /*
+ * This is only valid because the commands which add events are
+ * processed in the same thread as the listing.
+ */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
+ increment_extended_len(event->filter_expression, &extended_len);
+ }
+ rcu_read_unlock();
+
+ *total_size = nb_event * sizeof(*tmp_events) + extended_len;
+ tmp_events = zmalloc(*total_size);
if (!tmp_events) {
PERROR("zmalloc agent events session");
ret = -LTTNG_ERR_FATAL;
goto error;
}
+ extended_at = ((uint8_t *) tmp_events) +
+ nb_event * sizeof(struct lttng_event);
+
rcu_read_lock();
cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
tmp_events[i].loglevel = event->loglevel_value;
tmp_events[i].loglevel_type = event->loglevel_type;
i++;
+
+ /* Append extended info */
+ append_extended_info(event->filter_expression, &extended_at);
}
rcu_read_unlock();
* Create a list of ust global domain events.
*/
static int list_lttng_ust_global_events(char *channel_name,
- struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
+ struct ltt_ust_domain_global *ust_global,
+ struct lttng_event **events, size_t *total_size)
{
int i = 0, ret = 0;
unsigned int nb_event = 0;
struct ltt_ust_channel *uchan;
struct ltt_ust_event *uevent;
struct lttng_event *tmp;
+ size_t extended_len = 0;
+ void *extended_at;
DBG("Listing UST global events for channel %s", channel_name);
node = lttng_ht_iter_get_node_str(&iter);
if (node == NULL) {
ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
+ goto end;
}
uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
nb_event = lttng_ht_get_count(uchan->events);
if (nb_event == 0) {
ret = nb_event;
- goto error;
+ *total_size = 0;
+ goto end;
}
DBG3("Listing UST global %d events", nb_event);
- tmp = zmalloc(nb_event * sizeof(struct lttng_event));
+ /* Compute required extended infos size */
+ cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
+ if (uevent->internal) {
+ nb_event--;
+ continue;
+ }
+
+ increment_extended_len(uevent->filter_expression,
+ &extended_len);
+ }
+ if (nb_event == 0) {
+ /* All events are internal, skip. */
+ ret = 0;
+ *total_size = 0;
+ goto end;
+ }
+
+ *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
+ tmp = zmalloc(*total_size);
if (tmp == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
}
+ extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
+
cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
if (uevent->internal) {
/* This event should remain hidden from clients */
- nb_event--;
continue;
}
strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
tmp[i].exclusion = 1;
}
i++;
+
+ /* Append extended info */
+ append_extended_info(uevent->filter_expression, &extended_at);
}
ret = nb_event;
*events = tmp;
-
-error:
+end:
rcu_read_unlock();
return ret;
}
* Fill lttng_event array of all kernel events in the channel.
*/
static int list_lttng_kernel_events(char *channel_name,
- struct ltt_kernel_session *kernel_session, struct lttng_event **events)
+ struct ltt_kernel_session *kernel_session,
+ struct lttng_event **events, size_t *total_size)
{
int i = 0, ret;
unsigned int nb_event;
struct ltt_kernel_event *event;
struct ltt_kernel_channel *kchan;
+ size_t extended_len = 0;
+ void *extended_at;
kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
if (kchan == NULL) {
DBG("Listing events for channel %s", kchan->channel->name);
if (nb_event == 0) {
+ *total_size = 0;
*events = NULL;
goto syscall;
}
- *events = zmalloc(nb_event * sizeof(struct lttng_event));
+ /* Compute required extended infos size */
+ cds_list_for_each_entry(event, &kchan->events_list.head, list) {
+ increment_extended_len(event->filter_expression, &extended_len);
+ }
+
+ *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
+ *events = zmalloc(*total_size);
if (*events == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
}
+ extended_at = ((uint8_t *) events) +
+ nb_event * sizeof(struct lttng_event);
+
/* Kernel channels */
cds_list_for_each_entry(event, &kchan->events_list.head , list) {
strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
break;
}
i++;
+
+ /* Append extended info */
+ append_extended_info(event->filter_expression, &extended_at);
}
syscall:
ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
goto error;
}
+ /* break is _not_ missing here. */
}
case LTTNG_DOMAIN_UST:
{
filter_expression = NULL;
filter = NULL;
exclusion = NULL;
- if (ret != LTTNG_OK) {
+ if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
+ goto already_enabled;
+ } else if (ret != LTTNG_OK) {
goto error;
}
break;
filter_copy, NULL, wpipe);
}
- if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
+ if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
+ goto already_enabled;
+ } else if (ret != LTTNG_OK) {
goto error;
}
ret = LTTNG_OK;
+already_enabled:
error:
free(filter_expression);
free(filter);
*/
ssize_t cmd_list_events(enum lttng_domain_type domain,
struct ltt_session *session, char *channel_name,
- struct lttng_event **events)
+ struct lttng_event **events, size_t *total_size)
{
int ret = 0;
ssize_t nb_event = 0;
case LTTNG_DOMAIN_KERNEL:
if (session->kernel_session != NULL) {
nb_event = list_lttng_kernel_events(channel_name,
- session->kernel_session, events);
+ session->kernel_session, events,
+ total_size);
}
break;
case LTTNG_DOMAIN_UST:
{
if (session->ust_session != NULL) {
nb_event = list_lttng_ust_global_events(channel_name,
- &session->ust_session->domain_global, events);
+ &session->ust_session->domain_global, events,
+ total_size);
}
break;
}
&iter.iter, agt, node.node) {
if (agt->domain == domain) {
nb_event = list_lttng_agent_events(
- agt, events);
+ agt, events,
+ total_size);
break;
}
}
projects / lttng-tools.git / blobdiff