X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fview.c;h=dd3c9a3cc225b06d2ff055fdfb7acdfe0bc141ef;hp=9508743e62878ade2428905ba0bfdc9e831537f5;hb=94e60b1f03ae2c3c9450ffc3eca8e052e2c37fb4;hpb=0c687325f18ccb6950cd6a8a9665f33a6890d5a1

diff --git a/src/bin/lttng/commands/view.c b/src/bin/lttng/commands/view.c
index 9508743e6..dd3c9a3cc 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");
@@ -342,6 +343,13 @@ static int view_trace(void)
 		trace_path = opt_trace_path;
 	}
 
+	if (sessions[i].enabled) {
+		WARN("Session %s is running. Please stop it before reading it.",
+				session_name);
+		ret = CMD_ERROR;
+		goto free_sessions;
+	}
+
 	MSG("Trace directory: %s\n", trace_path);
 
 	ret = spawn_viewer(trace_path);