+
+/* WILDCARDS */
+
+static
+int wildcard_same_loglevel(struct wildcard_entry *e,
+ enum lttng_ust_loglevel_type loglevel_type,
+ int loglevel)
+{
+ if (e->loglevel_type == loglevel_type && e->loglevel == loglevel)
+ return 1;
+ else
+ return 0;
+}
+
+#if 0
+static
+int wildcard_is_within(struct wildcard_entry *e,
+ enum lttng_ust_loglevel_type loglevel_type,
+ int loglevel)
+{
+ if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+ || e->loglevel == -1)
+ return 1;
+ switch (e->loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ switch (loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ if (e->loglevel >= loglevel)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ if (e->loglevel <= 0 && loglevel == 0)
+ return 1;
+ else
+ return 0;
+ }
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ switch (loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ if (loglevel <= 0)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ if (e->loglevel == loglevel)
+ return 1;
+ else
+ return 0;
+ }
+ }
+}
+#endif
+
+/*
+ * Add the wildcard to the wildcard list. Must be called with
+ * ust lock held.
+ */
+static
+struct session_wildcard *add_wildcard(struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
+{
+ 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);
+ 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;
+}
+
+/*
+ * Remove the wildcard from the wildcard list. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+static
+void _remove_wildcard(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev, *tmp;
+
+ /*
+ * Just remove the events owned (for enable/disable) by this
+ * wildcard from the list. The session teardown will take care
+ * of freeing the event memory.
+ */
+ cds_list_for_each_entry_safe(ev, tmp, &wildcard->events,
+ wildcard_list) {
+ cds_list_del(&ev->wildcard_list);
+ }
+ cds_list_del(&wildcard->session_list);
+ cds_list_del(&wildcard->list);
+ if (cds_list_empty(&wildcard->entry->session_list)) {
+ cds_list_del(&wildcard->entry->list);
+ free(wildcard->entry);
+ }
+ free(wildcard);
+}
+
+int ltt_wildcard_create(struct ltt_channel *chan,
+ struct lttng_ust_event *event_param,
+ struct session_wildcard **_sw)
+{
+ struct session_wildcard *sw;
+
+ sw = add_wildcard(chan, event_param);
+ if (!sw || IS_ERR(sw)) {
+ return PTR_ERR(sw);
+ }
+ *_sw = sw;
+ return 0;
+}
+
+static
+void _ltt_wildcard_destroy(struct session_wildcard *sw)
+{
+ _remove_wildcard(sw);
+}
+
+int ltt_wildcard_enable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
+ ret = ltt_event_enable(ev);
+ if (ret) {
+ DBG("Error: enable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 1;
+ return 0;
+}
+
+int ltt_wildcard_disable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (!wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 0;
+ return 0;
+}
+
+/*
+ * Take the TLS "fault" in libuuid if dlopen'd, which can take the
+ * dynamic linker mutex, outside of the UST lock, since the UST lock is
+ * taken in constructors, which are called with dynamic linker mutex
+ * held.
+ */
+void lttng_fixup_event_tls(void)
+{
+ unsigned char uuid[37];
+
+ (void) uuid_generate(uuid);
+}