lttng.h API update: set filter becomes enable event with filter
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
index 962255b5c930989100600592253e56589b1fe22d..1fda555ea0e987bdcc11565b43ffea84b1d85765 100644 (file)
 
 #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)
 {
@@ -43,13 +48,19 @@ int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
                goto no_match;
        }
 
-       /* 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;
@@ -65,55 +76,43 @@ int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
 
        /* Event name */
        if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
-               DBG3("[Match] name failed: %s and %s",
-                               event->attr.name, key->name);
                goto no_match;
        }
 
        /* Event loglevel. */
        if (event->attr.loglevel != key->loglevel) {
-               if (event->attr.loglevel_type == 0 && key->loglevel == 0 &&
-                               event->attr.loglevel == -1) {
+               if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+                               && key->loglevel == 0 && event->attr.loglevel == -1) {
                        /*
-                        * 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.
+                        * 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 {
-                       DBG3("[Match] loglevel failed: %d and %d",
-                                       event->attr.loglevel, key->loglevel);
                        goto no_match;
                }
        }
 
        /* Only one of the filters is NULL, fail. */
        if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
-               DBG3("[Match] filters failed: k:%p and e:%p",
-                               key->filter, event->filter);
                goto no_match;
        }
 
-       /* Both filters are NULL, success. */
-       if (!key->filter && !event->filter) {
-               goto match;
-       }
-
-       /* 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 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;
+               }
        }
 
-       DBG3("[Match] filters failed: k:%p and e:%p",
-                       key->filter, event->filter);
+       /* Match. */
+       return 1;
 
 no_match:
        return 0;
-
-match:
-       DBG3("[MATCH] %s", key->name);
-       return 1;
 }
 
 /*
@@ -152,7 +151,6 @@ struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
        struct lttng_ht_node_str *node;
        struct lttng_ht_iter iter;
        struct ltt_ust_ht_key key;
-       void *orig_match_fct;
 
        assert(name);
        assert(ht);
@@ -161,10 +159,6 @@ struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
        key.filter = filter;
        key.loglevel = loglevel;
 
-       /* Save match function so we can use the ust app event match. */
-       orig_match_fct = (void *) ht->match_fct;
-       ht->match_fct = trace_ust_ht_match_event;
-
        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);
@@ -178,8 +172,6 @@ struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
 
 error:
        DBG2("Trace UST event %s NOT found", key.name);
-       /* Put back original match function. */
-       ht->match_fct = orig_match_fct;
        return NULL;
 }
 
@@ -324,7 +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;
 
@@ -374,6 +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);
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