X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fcmd.c;h=5bf00be8536f12cb124fd0d828486344b75734b7;hb=8c93562f396a3e785c5193ca32b40f1f16599a6a;hp=4343fb114191352dbdaf13ee7a928fc283119c08;hpb=2e84128e5c7b7a40ede7276c8ada56a56631c5dc;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index 4343fb114..5bf00be85 100644
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -1439,6 +1439,7 @@ int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
 		assert(usess);
 
 		/* Create the default JUL tracepoint. */
+		memset(&uevent, 0, sizeof(uevent));
 		uevent.type = LTTNG_EVENT_TRACEPOINT;
 		uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 		strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
@@ -1460,7 +1461,7 @@ int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
 
 		/* The wild card * means that everything should be enabled. */
 		if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
-			ret = event_jul_enable_all(usess);
+			ret = event_jul_enable_all(usess, event);
 		} else {
 			ret = event_jul_enable(usess, event);
 		}
@@ -1644,7 +1645,7 @@ int cmd_enable_event_all(struct ltt_session *session,
 	}
 	case LTTNG_DOMAIN_JUL:
 	{
-		struct lttng_event uevent;
+		struct lttng_event uevent, event;
 		struct lttng_domain tmp_dom;
 		struct ltt_ust_session *usess = session->ust_session;
 
@@ -1670,7 +1671,12 @@ int cmd_enable_event_all(struct ltt_session *session,
 			goto error;
 		}
 
-		ret = event_jul_enable_all(usess);
+		event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
+		event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
+		strncpy(event.name, "*", sizeof(event.name));
+		event.name[sizeof(event.name) - 1] = '\0';
+
+		ret = event_jul_enable_all(usess, &event);
 		if (ret != LTTNG_OK) {
 			goto error;
 		}
@@ -1773,6 +1779,7 @@ error:
 int cmd_start_trace(struct ltt_session *session)
 {
 	int ret;
+	unsigned long nb_chan = 0;
 	struct ltt_kernel_session *ksession;
 	struct ltt_ust_session *usess;
 
@@ -1788,6 +1795,21 @@ int cmd_start_trace(struct ltt_session *session)
 		goto error;
 	}
 
+	/*
+	 * Starting a session without channel is useless since after that it's not
+	 * possible to enable channel thus inform the client.
+	 */
+	if (usess && usess->domain_global.channels) {
+		nb_chan += lttng_ht_get_count(usess->domain_global.channels);
+	}
+	if (ksession) {
+		nb_chan += ksession->channel_count;
+	}
+	if (!nb_chan) {
+		ret = LTTNG_ERR_NO_CHANNEL;
+		goto error;
+	}
+
 	session->enabled = 1;
 
 	/* Kernel tracing */
@@ -2846,12 +2868,17 @@ static int record_ust_snapshot(struct ltt_ust_session *usess,
 
 	ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
 	if (ret < 0) {
-		if (ret == -EINVAL) {
+		switch (-ret) {
+		case EINVAL:
 			ret = LTTNG_ERR_INVALID;
-			goto error_snapshot;
+			break;
+		case ENODATA:
+			ret = LTTNG_ERR_SNAPSHOT_NODATA;
+			break;
+		default:
+			ret = LTTNG_ERR_SNAPSHOT_FAIL;
+			break;
 		}
-
-		ret = LTTNG_ERR_SNAPSHOT_FAIL;
 		goto error_snapshot;
 	}