Fix a typo in lttng-probe-module name

[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 4c7dac8b72111f33904e7fef69a53e77578171cb..1fda555ea0e987bdcc11565b43ffea84b1d85765 100644 (file)
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -26,6 +26,95 @@
 
 #include "trace-ust.h"
 
+/*
+ * Match function for the events hash table lookup.
+ *
+ * Matches by name only. Used by the disable command.
+ */
+int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
+               const void *_key)
+{
+       struct ltt_ust_event *event;
+       const char *name;
+
+       assert(node);
+       assert(_key);
+
+       event = caa_container_of(node, struct ltt_ust_event, node.node);
+       name = _key;
+
+       /* Event name */
+       if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
+               goto no_match;
+       }
+
+       /* Match */
+       return 1;
+
+no_match:
+       return 0;
+}
+
+/*
+ * Match function for the hash table lookup.
+ *
+ * It matches an ust event based on three attributes which are the event name,
+ * the filter bytecode and the loglevel.
+ */
+int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
+{
+       struct ltt_ust_event *event;
+       const struct ltt_ust_ht_key *key;
+
+       assert(node);
+       assert(_key);
+
+       event = caa_container_of(node, struct ltt_ust_event, node.node);
+       key = _key;
+
+       /* Match the 3 elements of the key: name, filter and loglevel. */
+
+       /* Event name */
+       if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
+               goto no_match;
+       }
+
+       /* Event loglevel. */
+       if (event->attr.loglevel != key->loglevel) {
+               if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+                               && key->loglevel == 0 && event->attr.loglevel == -1) {
+                       /*
+                        * Match is accepted. This is because on event creation, the
+                        * loglevel is set to -1 if the event loglevel type is ALL so 0 and
+                        * -1 are accepted for this loglevel type since 0 is the one set by
+                        * the API when receiving an enable event.
+                        */
+               } else {
+                       goto no_match;
+               }
+       }
+
+       /* Only one of the filters is NULL, fail. */
+       if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
+               goto no_match;
+       }
+
+       if (key->filter && event->filter) {
+               /* Both filters exists, check length followed by the bytecode. */
+               if (event->filter->len != key->filter->len ||
+                               memcmp(event->filter->data, key->filter->data,
+                                       event->filter->len) != 0) {
+                       goto no_match;
+               }
+       }
+
+       /* Match. */
+       return 1;
+
+no_match:
+       return 0;
+}
+
 /*
  * Find the channel in the hashtable.
  */
@@ -56,27 +145,33 @@ error:
 /*
  * Find the event in the hashtable.
  */
-struct ltt_ust_event *trace_ust_find_event_by_name(struct lttng_ht *ht,
-               char *name)
+struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
+               char *name, struct lttng_filter_bytecode *filter, int loglevel)
 {
        struct lttng_ht_node_str *node;
        struct lttng_ht_iter iter;
+       struct ltt_ust_ht_key key;
 
-       rcu_read_lock();
-       lttng_ht_lookup(ht, (void *) name, &iter);
+       assert(name);
+       assert(ht);
+
+       key.name = name;
+       key.filter = filter;
+       key.loglevel = loglevel;
+
+       cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
+                       trace_ust_ht_match_event, &key, &iter.iter);
        node = lttng_ht_iter_get_node_str(&iter);
        if (node == NULL) {
-               rcu_read_unlock();
                goto error;
        }
-       rcu_read_unlock();
 
-       DBG2("Trace UST event found by name %s", name);
+       DBG2("Trace UST event %s found", key.name);
 
        return caa_container_of(node, struct ltt_ust_event, node);
 
 error:
-       DBG2("Trace UST event NOT found by name %s", name);
+       DBG2("Trace UST event %s NOT found", key.name);
        return NULL;
 }
 
@@ -221,7 +316,8 @@ error:
  *
  * Return pointer to structure or NULL.
  */
-struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
+struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
+               struct lttng_filter_bytecode *filter)
 {
        struct ltt_ust_event *lue;
 
@@ -271,6 +367,8 @@ struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
                goto error_free_event;
        }
 
+       /* Same layout. */
+       lue->filter = (struct lttng_ust_filter_bytecode *) filter;
 
        /* Init node */
        lttng_ht_node_init_str(&lue->node, lue->attr.name);