#define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS)
static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE];
+/*
+ * Wildcard list, containing the active wildcards.
+ * Protected by ust lock.
+ */
+static CDS_LIST_HEAD(wildcard_list);
+
static
const struct lttng_probe_desc *find_provider(const char *provider)
{
loglevel->enabled = 0;
return 0;
}
+
+/* WILDCARDS */
+
+/*
+ * Return wildcard for a given event name if the event name match the
+ * one of the wildcards.
+ * Must be called with ust lock held.
+ * Returns NULL if not present.
+ */
+struct wildcard_entry *match_wildcard(const char *name)
+{
+ struct wildcard_entry *e;
+
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ /* If only contain '*' */
+ if (strlen(e->name) == 1)
+ return e;
+ /* Compare excluding final '*' */
+ if (!strncmp(name, e->name, strlen(e->name) - 1))
+ return e;
+ }
+ return NULL;
+}
+
+/*
+ * marshall all probes/all events and create those that fit the
+ * wildcard. Add them to the events list as created.
+ */
+static
+void _probes_create_wildcard_events(struct wildcard_entry *entry,
+ struct session_wildcard *wildcard)
+{
+ struct lttng_probe_desc *probe_desc;
+ struct lttng_ust_event event_param;
+ int i;
+
+ cds_list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ int match = 0;
+
+ event_desc = probe_desc->event_desc[i];
+ /* compare excluding final '*' */
+ assert(strlen(entry->name) > 0);
+ if (strcmp(event_desc->name, "lttng_ust:metadata")
+ && (strlen(entry->name) == 1
+ || !strncmp(event_desc->name, entry->name,
+ strlen(entry->name) - 1))) {
+ match = 1;
+ }
+ if (match) {
+ struct ltt_event *ev;
+ int ret;
+
+ memcpy(&event_param, &wildcard->event_param,
+ sizeof(event_param));
+ memcpy(event_param.name,
+ event_desc->name,
+ sizeof(event_param.name));
+ /* create event */
+ ret = ltt_event_create(wildcard->chan,
+ &event_param, NULL,
+ &ev);
+ if (ret) {
+ DBG("Error creating event");
+ continue;
+ }
+ cds_list_add(&ev->wildcard_list,
+ &wildcard->events);
+ }
+ }
+ }
+}
+
+/*
+ * Add the wildcard to the wildcard hash table. Must be called with
+ * ust lock held.
+ */
+struct session_wildcard *add_wildcard(const char *name,
+ struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
+{
+ struct wildcard_entry *e;
+ struct session_wildcard *sw;
+ size_t name_len = strlen(name) + 1;
+ int found = 0;
+
+ /* wildcard entry */
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ if (!strcmp(name, e->name)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!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], 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", 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;
+ 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;
+ _probes_create_wildcard_events(e, sw);
+ return sw;
+}
+
+/*
+ * Remove the wildcard from the wildcard hash table. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+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, list) {
+ cds_list_del(&ev->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_enable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, 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, list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 0;
+ return 0;
+}
projects / lttng-ust.git / blobdiff