Port: Remove _GNU_SOURCE, defined in config.h

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

diff --git a/src/bin/lttng-sessiond/agent.c b/src/bin/lttng-sessiond/agent.c
index f230c3619d43c9deae4c6d321e357194dc1b18b2..35f0e578a0da725863f1b07be9d385a577371ea2 100644 (file)
--- a/src/bin/lttng-sessiond/agent.c
+++ b/src/bin/lttng-sessiond/agent.c
@@ -15,7 +15,6 @@
  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
 #define _LGPL_SOURCE
 #include <assert.h>
 #include <urcu/uatomic.h>
@@ -103,6 +102,7 @@ static int ht_match_event(struct cds_lfht_node *node,
 {
        struct agent_event *event;
        const struct agent_ht_key *key;
+       int ll_match;
 
        assert(node);
        assert(_key);
@@ -117,15 +117,15 @@ static int ht_match_event(struct cds_lfht_node *node,
                goto no_match;
        }
 
-       if (event->loglevel_value != key->loglevel_value) {
-               if (event->loglevel_type == LTTNG_EVENT_LOGLEVEL_ALL &&
-                               key->loglevel_value == 0 &&
-                               event->loglevel_value == -1) {
-                       goto match;
-               }
+       /* Event loglevel value and type. */
+       ll_match = loglevels_match(event->loglevel_type,
+               event->loglevel_value, key->loglevel_type,
+               key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL);
+
+       if (!ll_match) {
                goto no_match;
        }
-match:
+
        return 1;
 
 no_match:
@@ -147,6 +147,7 @@ static void add_unique_agent_event(struct lttng_ht *ht,
 
        key.name = event->name;
        key.loglevel_value = event->loglevel_value;
+       key.loglevel_type = event->loglevel_type;
 
        node_ptr = cds_lfht_add_unique(ht->ht,
                        ht->hash_fct(event->node.key, lttng_ht_seed),
@@ -827,12 +828,13 @@ error:
  * Return a new object else NULL on error.
  */
 struct agent_event *agent_create_event(const char *name,
-               int loglevel_value, enum lttng_loglevel_type loglevel_type,
+               enum lttng_loglevel_type loglevel_type, int loglevel_value,
                struct lttng_filter_bytecode *filter, char *filter_expression)
 {
        struct agent_event *event = NULL;
 
-       DBG3("Agent create new event with name %s", name);
+       DBG3("Agent create new event with name %s, loglevel type %d and loglevel value %d",
+               name, loglevel_type, loglevel_value);
 
        if (!name) {
                ERR("Failed to create agent event; no name provided.");
@@ -871,50 +873,59 @@ void agent_add_event(struct agent_event *event, struct agent *agt)
 }
 
 /*
- * Find a agent event in the given agent using name.
+ * Find multiple agent events sharing the given name.
  *
- * RCU read side lock MUST be acquired.
+ * RCU read side lock MUST be acquired. It must be held for the
+ * duration of the iteration.
  *
- * Return object if found else NULL.
+ * Sets the given iterator.
  */
-struct agent_event *agent_find_event_by_name(const char *name,
-               struct agent *agt)
+void agent_find_events_by_name(const char *name, struct agent *agt,
+               struct lttng_ht_iter* iter)
 {
-       struct lttng_ht_node_str *node;
-       struct lttng_ht_iter iter;
        struct lttng_ht *ht;
        struct agent_ht_key key;
 
        assert(name);
        assert(agt);
        assert(agt->events);
+       assert(iter);
 
        ht = agt->events;
        key.name = name;
 
        cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
-                       ht_match_event_by_name, &key, &iter.iter);
-       node = lttng_ht_iter_get_node_str(&iter);
-       if (node == NULL) {
-               goto error;
-       }
+                       ht_match_event_by_name, &key, &iter->iter);
+}
 
-       DBG3("Agent event found %s by name.", name);
-       return caa_container_of(node, struct agent_event, node);
+/*
+ * Get the next agent event duplicate by name. This should be called
+ * after a call to agent_find_events_by_name() to iterate on events.
+ *
+ * The RCU read lock must be held during the iteration and for as long
+ * as the object the iterator points to remains in use.
+ */
+void agent_event_next_duplicate(const char *name,
+               struct agent *agt, struct lttng_ht_iter* iter)
+{
+       struct agent_ht_key key;
 
-error:
-       DBG3("Agent NOT found by name %s.", name);
-       return NULL;
+       key.name = name;
+
+       cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name,
+               &key, &iter->iter);
 }
 
 /*
  * Find a agent event in the given agent using name and loglevel.
  *
- * RCU read side lock MUST be acquired.
+ * RCU read side lock MUST be acquired. It must be kept for as long as
+ * the returned agent_event is used.
  *
  * Return object if found else NULL.
  */
-struct agent_event *agent_find_event(const char *name, int loglevel_value,
+struct agent_event *agent_find_event(const char *name,
+               enum lttng_loglevel_type loglevel_type, int loglevel_value,
                struct agent *agt)
 {
        struct lttng_ht_node_str *node;
@@ -929,6 +940,7 @@ struct agent_event *agent_find_event(const char *name, int loglevel_value,
        ht = agt->events;
        key.name = name;
        key.loglevel_value = loglevel_value;
+       key.loglevel_type = loglevel_type;
 
        cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
                        ht_match_event, &key, &iter.iter);