+ struct wildcard_entry *e;
+ struct session_wildcard *sw;
+ size_t name_len = strlen(event_param->name) + 1;
+ int found = 0;
+
+ /*
+ * Try to find global wildcard entry. Given that this is shared
+ * across all sessions, we need to check for exact loglevel
+ * match, not just whether contained within the existing ones.
+ */
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ if (!strncmp(event_param->name, e->name,
+ LTTNG_UST_SYM_NAME_LEN - 1)) {
+ if (wildcard_same_loglevel(e,
+ event_param->loglevel_type,
+ event_param->loglevel)) {
+ found = 1;
+ break;
+ }
+ }
+ }
+
+ if (!found) {
+ /*
+ * Create global wildcard entry if not found. Using
+ * zmalloc here to allocate a variable length element.
+ * Could cause some memory fragmentation if overused.
+ */
+ e = zmalloc(sizeof(struct wildcard_entry) + name_len);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], event_param->name, name_len);
+ e->loglevel_type = event_param->loglevel_type;
+ e->loglevel = event_param->loglevel;
+ cds_list_add(&e->list, &wildcard_list);
+ CDS_INIT_LIST_HEAD(&e->session_list);
+ }
+
+ /* session wildcard */
+ cds_list_for_each_entry(sw, &e->session_list, session_list) {
+ if (chan == sw->chan) {
+ DBG("wildcard %s busy for this channel",
+ event_param->name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ sw = zmalloc(sizeof(struct session_wildcard));
+ if (!sw)
+ return ERR_PTR(-ENOMEM);
+ sw->chan = chan;
+ sw->enabled = 1;
+ memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
+ sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
+ sw->event_param.loglevel_type = event_param->loglevel_type;
+ sw->event_param.loglevel = event_param->loglevel;
+ CDS_INIT_LIST_HEAD(&sw->events);
+ cds_list_add(&sw->list, &chan->session->wildcards);
+ cds_list_add(&sw->session_list, &e->session_list);
+ sw->entry = e;
+ ltt_probes_create_wildcard_events(e, sw);
+ return sw;