X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=liblttng-ust%2Flttng-events.c;h=16d75da95b0c265d4785ca61de0513caa29476eb;hb=4296085ed28955001e74ac2c0cf6817ab9ecdb5f;hp=53bb1100cab922b7fd86a0349c69ce3b057bfb98;hpb=8406222c45d29b23064d688e33be84894a51baac;p=deliverable%2Flttng-ust.git

diff --git a/liblttng-ust/lttng-events.c b/liblttng-ust/lttng-events.c
index 53bb1100..16d75da9 100644
--- a/liblttng-ust/lttng-events.c
+++ b/liblttng-ust/lttng-events.c
@@ -1708,6 +1708,13 @@ void lttng_session_sync_event_enablers(struct lttng_session *session)
 	__tracepoint_probe_prune_release_queue();
 }
 
+/* Support for event notifier is introduced by probe provider major version 2. */
+static
+bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc)
+{
+	return probe_desc->major >= 2;
+}
+
 static
 void lttng_create_event_notifier_if_missing(
 		struct lttng_event_notifier_enabler *event_notifier_enabler)
@@ -1759,6 +1766,18 @@ void lttng_create_event_notifier_if_missing(
 			if (found)
 				continue;
 
+			/* Check that the probe supports event notifiers, else report the error. */
+			if (!lttng_ust_probe_supports_event_notifier(probe_desc)) {
+				ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
+					"but its version (%u.%u) is too old and does not implement event notifiers. "
+					"It needs to be recompiled against a newer version of LTTng-UST, otherwise "
+					"this event will not generate any notification.",
+					probe_desc->provider,
+					desc->name,
+					probe_desc->major,
+					probe_desc->minor);
+				continue;
+			}
 			/*
 			 * We need to create a event_notifier for this event probe.
 			 */