X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fview.c;h=e3eff22ca394c6680babf7ef75a064bb7bc53b83;hp=9508743e62878ade2428905ba0bfdc9e831537f5;hb=c617c0c651432f9d5ae7adf4c5c1a5fd92ad828e;hpb=0c687325f18ccb6950cd6a8a9665f33a6890d5a1

diff --git a/src/bin/lttng/commands/view.c b/src/bin/lttng/commands/view.c
index 9508743e6..e3eff22ca 100644
--- a/src/bin/lttng/commands/view.c
+++ b/src/bin/lttng/commands/view.c
@@ -88,6 +88,7 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "Where SESSION_NAME is an optional session name. If not specified, lttng will\n");
 	fprintf(ofp, "get it from the configuration file (.lttngrc).\n");
 	fprintf(ofp, "\n");
+	fprintf(ofp, "Options:\n");
 	fprintf(ofp, "  -h, --help               Show this help\n");
 	fprintf(ofp, "      --list-options       Simple listing of options\n");
 	fprintf(ofp, "  -t, --trace-path PATH    Trace directory path for the viewer\n");
@@ -277,7 +278,7 @@ error:
  */
 static int view_trace(void)
 {
-	int ret, count, i, found = 0;
+	int ret;
 	char *session_name, *trace_path;
 	struct lttng_session *sessions = NULL;
 
@@ -313,6 +314,8 @@ static int view_trace(void)
 	DBG("Viewing trace for session %s", session_name);
 
 	if (session_name) {
+		int i, count, found = 0;
+
 		/* Getting all sessions */
 		count = lttng_list_sessions(&sessions);
 		if (count < 0) {
@@ -338,6 +341,13 @@ static int view_trace(void)
 		}
 
 		trace_path = sessions[i].path;
+
+		if (sessions[i].enabled) {
+			WARN("Session %s is running. Please stop it before reading it.",
+					session_name);
+			ret = CMD_ERROR;
+			goto free_sessions;
+		}
 	} else {
 		trace_path = opt_trace_path;
 	}