Ignore exclusion names order when matching events

In other words:

    lttng enable-event -u -a --exclude a,b,c,d  ->  passes
    lttng enable-event -u -a --exclude a,c,d,b  ->  fails (same event)

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 4b7363f9fd2b15c6e4e1f05c9fe49cd58ff9f9c9..1ddd597cf5647082a6eba147c32adab2cbb2aaa6 100644 (file)
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -116,12 +116,46 @@ int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
        }
 
        if (key->exclusion && event->exclusion) {
-               /* Both exclusions exist; check count followed by names. */
-               if (event->exclusion->count != key->exclusion->count ||
-                               memcmp(event->exclusion->names, key->exclusion->names,
-                                       event->exclusion->count * LTTNG_SYMBOL_NAME_LEN) != 0) {
+               size_t i;
+
+               /* Check exclusion counts first. */
+               if (event->exclusion->count != key->exclusion->count) {
                        goto no_match;
                }
+
+               /* Compare names individually. */
+               for (i = 0; i < event->exclusion->count; ++i) {
+                       size_t j;
+                       bool found = false;
+                       const char *name_ev =
+                               LTTNG_EVENT_EXCLUSION_NAME_AT(
+                                       event->exclusion, i);
+
+                       /*
+                        * Compare this exclusion name to all the key's
+                        * exclusion names.
+                        */
+                       for (j = 0; j < key->exclusion->count; ++j) {
+                               const char *name_key =
+                                       LTTNG_EVENT_EXCLUSION_NAME_AT(
+                                               key->exclusion, j);
+
+                               if (!strncmp(name_ev, name_key,
+                                               LTTNG_SYMBOL_NAME_LEN)) {
+                                       /* Names match! */
+                                       found = true;
+                                       break;
+                               }
+                       }
+
+                       /*
+                        * If the current exclusion name was not found amongst
+                        * the key's exclusion names, then there's no match.
+                        */
+                       if (!found) {
+                               goto no_match;
+                       }
+               }
        }
        /* Match. */
        return 1;