Add wildcard support

[lttng-ust.git] / liblttng-ust / ltt-events.c

diff --git a/liblttng-ust/ltt-events.c b/liblttng-ust/ltt-events.c
index 7882f6d2a63b84fdc0a2659b69d3e6e6d99027c0..9650e8b0703d608492d61ac273e1ef6f1768296b 100644 (file)
--- a/liblttng-ust/ltt-events.c
+++ b/liblttng-ust/ltt-events.c
@@ -75,6 +75,7 @@ struct ust_pending_probe {
 
 static void _ltt_event_destroy(struct ltt_event *event);
 static void _ltt_loglevel_destroy(struct session_loglevel *sl);
+static void _ltt_wildcard_destroy(struct session_wildcard *sw);
 static void _ltt_channel_destroy(struct ltt_channel *chan);
 static int _ltt_event_unregister(struct ltt_event *event);
 static
@@ -176,6 +177,38 @@ int pending_probe_fix_events(const struct lttng_event_desc *desc)
                }
        }
 
+       /* Wildcard */
+       {
+               struct wildcard_entry *wildcard;
+
+               wildcard = match_wildcard(desc->name);
+               if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) {
+                       struct session_wildcard *sw;
+
+                       cds_list_for_each_entry(sw, &wildcard->session_list,
+                                       session_list) {
+                               struct ltt_event *ev;
+                               int ret;
+
+                               memcpy(&event_param, &sw->event_param,
+                                               sizeof(event_param));
+                               memcpy(event_param.name,
+                                       desc->name,
+                                       sizeof(event_param.name));
+                               /* create event */
+                               ret = ltt_event_create(sw->chan,
+                                       &event_param, NULL,
+                                       &ev);
+                               if (ret) {
+                                       DBG("Error creating event");
+                                       continue;
+                               }
+                               cds_list_add(&ev->wildcard_list,
+                                       &sw->events);
+                       }
+               }
+       }
+
        head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)];
        cds_hlist_for_each_entry_safe(e, node, p, head, node) {
                struct ltt_event *event;
@@ -216,6 +249,7 @@ struct ltt_session *ltt_session_create(void)
        CDS_INIT_LIST_HEAD(&session->chan);
        CDS_INIT_LIST_HEAD(&session->events);
        CDS_INIT_LIST_HEAD(&session->loglevels);
+       CDS_INIT_LIST_HEAD(&session->wildcards);
        uuid_generate(session->uuid);
        cds_list_add(&session->list, &sessions);
        return session;
@@ -226,6 +260,7 @@ void ltt_session_destroy(struct ltt_session *session)
        struct ltt_channel *chan, *tmpchan;
        struct ltt_event *event, *tmpevent;
        struct session_loglevel *loglevel, *tmploglevel;
+       struct session_wildcard *wildcard, *tmpwildcard;
        int ret;
 
        CMM_ACCESS_ONCE(session->active) = 0;
@@ -236,6 +271,8 @@ void ltt_session_destroy(struct ltt_session *session)
        synchronize_trace();    /* Wait for in-flight events to complete */
        cds_list_for_each_entry_safe(loglevel, tmploglevel, &session->loglevels, list)
                _ltt_loglevel_destroy(loglevel);
+       cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list)
+               _ltt_wildcard_destroy(wildcard);
        cds_list_for_each_entry_safe(event, tmpevent, &session->events, list)
                _ltt_event_destroy(event);
        cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list)
@@ -413,6 +450,26 @@ void _ltt_loglevel_destroy(struct session_loglevel *sl)
        _remove_loglevel(sl);
 }
 
+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(event_param->name, 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);
+}
+
 /*
  * Supports event creation while tracing session is active.
  */
@@ -810,6 +867,19 @@ int _ltt_event_metadata_statedump(struct ltt_session *session,
        if (ret)
                goto end;
 
+       if (event->desc->loglevel) {
+               const struct tracepoint_loglevel_entry *ll_entry;
+
+               ll_entry = *event->desc->loglevel;
+               ret = lttng_metadata_printf(session,
+                       "       loglevel.identifier = \"%s\";\n"
+                       "       loglevel.value = %lld;\n",
+                       ll_entry->identifier,
+                       (long long) ll_entry->value);
+               if (ret)
+                       goto end;
+       }
+
        if (event->ctx) {
                ret = lttng_metadata_printf(session,
                        "       context := struct {\n");