X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fbin%2Flttng-sessiond%2Fcmd.c;h=f72d4bb17a3c353a31b4f55ac49aaedc87744eef;hb=4b35a6b3dbbaf925b2cb95ab36bef3546334607a;hp=b1e66e755bf0f621fb8c78f84a6d8c9043cedc55;hpb=c890b720e435173420cac747c5701147ff7ead99;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index b1e66e755..f72d4bb17 100644
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -1528,11 +1528,6 @@ int cmd_set_consumer_uri(int domain, struct ltt_session *session,
 		goto error;
 	}
 
-	if (!session->start_consumer) {
-		ret = LTTNG_ERR_NO_CONSUMER;
-		goto error;
-	}
-
 	/*
 	 * This case switch makes sure the domain session has a temporary consumer
 	 * so the URL can be set.
@@ -2142,11 +2137,6 @@ int cmd_enable_consumer(int domain, struct ltt_session *session)
 		goto error;
 	}
 
-	if (!session->start_consumer) {
-		ret = LTTNG_ERR_NO_CONSUMER;
-		goto error;
-	}
-
 	switch (domain) {
 	case 0:
 		assert(session->consumer);
@@ -2320,6 +2310,8 @@ int cmd_enable_consumer(int domain, struct ltt_session *session)
 		break;
 	}
 
+	session->start_consumer = 1;
+
 	/* Enable it */
 	if (consumer) {
 		consumer->enabled = 1;
@@ -2334,6 +2326,47 @@ error:
 	return ret;
 }
 
+/*
+ * Command LTTNG_DATA_AVAILABLE returning 0 if the data is NOT ready to be read
+ * or else 1 if the data is available for trace analysis.
+ */
+int cmd_data_available(struct ltt_session *session)
+{
+	int ret;
+	struct ltt_kernel_session *ksess = session->kernel_session;
+	struct ltt_ust_session *usess = session->ust_session;
+
+	assert(session);
+
+	/* Session MUST be stopped to ask for data availability. */
+	if (session->enabled) {
+		ret = LTTNG_ERR_SESSION_STARTED;
+		goto error;
+	}
+
+	if (ksess && ksess->consumer) {
+		ret = consumer_is_data_available(ksess->id, ksess->consumer);
+		if (ret == 0) {
+			/* Data is still being extracted for the kernel. */
+			goto error;
+		}
+	}
+
+	if (usess && usess->consumer) {
+		ret = consumer_is_data_available(usess->id, usess->consumer);
+		if (ret == 0) {
+			/* Data is still being extracted for the kernel. */
+			goto error;
+		}
+	}
+
+	/* Data is ready to be read by a viewer */
+	ret = 1;
+
+error:
+	return ret;
+}
+
 /*
  * Init command subsystem.
  */