X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fview.c;h=dd3c9a3cc225b06d2ff055fdfb7acdfe0bc141ef;hp=9e7c9d91e55d8127e4e09d43169dd35dc14cfaa7;hb=94e60b1f03ae2c3c9450ffc3eca8e052e2c37fb4;hpb=d14d33bf091e72b23b1f90ea18a0a01bed098b76

diff --git a/src/bin/lttng/commands/view.c b/src/bin/lttng/commands/view.c
index 9e7c9d91e..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");
@@ -258,7 +259,11 @@ static int spawn_viewer(const char *trace_path)
 
 	ret = execvp(viewer_bin, argv);
 	if (ret) {
-		PERROR("exec: %s", viewer_bin);
+		if (errno == ENOENT) {
+			ERR("%s not found on the system", viewer_bin);
+		} else {
+			PERROR("exec: %s", viewer_bin);
+		}
 		free(argv);
 		ret = CMD_FATAL;
 		goto error;
@@ -338,6 +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);
@@ -346,8 +358,6 @@ static int view_trace(void)
 		goto free_sessions;
 	}
 
-	ret = CMD_SUCCESS;
-
 free_sessions:
 	if (sessions) {
 		free(sessions);