/*
* Find an event using the name and signature in the given registry. RCU read
* side lock MUST be acquired before calling this function and as long as the
* event reference is kept by the caller.
*
* On success, the event pointer is returned else NULL.
*/
struct ust_registry_event *ust_registry_find_event(
struct ust_registry_channel *chan, char *name, char *sig)
{
struct lttng_ht_node_u64 *node;
struct lttng_ht_iter iter;
struct ust_registry_event *event = NULL;
struct ust_registry_event key;
assert(chan);
assert(name);
assert(sig);
/* Setup key for the match function. */
strncpy(key.name, name, sizeof(key.name));
key.name[sizeof(key.name) - 1] = '\0';
key.signature = sig;
cds_lfht_lookup(chan->ht->ht, chan->ht->hash_fct(&key, lttng_ht_seed),
chan->ht->match_fct, &key, &iter.iter);
node = lttng_ht_iter_get_node_u64(&iter);
if (!node) {
goto end;
}
event = caa_container_of(node, struct ust_registry_event, node);
end:
return event;
}
/*
* Find viewer stream by id. RCU read side lock MUST be acquired.
*
* Return stream if found else NULL.
*/
struct relay_viewer_stream *viewer_stream_find_by_id(uint64_t id)
{
struct lttng_ht_node_u64 *node;
struct lttng_ht_iter iter;
struct relay_viewer_stream *stream = NULL;
lttng_ht_lookup(viewer_streams_ht, &id, &iter);
node = lttng_ht_iter_get_node_u64(&iter);
if (!node) {
DBG("Relay viewer stream %" PRIu64 " not found", id);
goto end;
}
stream = caa_container_of(node, struct relay_viewer_stream, stream_n);
end:
return stream;
}
