+pidfilepath="/tmp/ust-testsuite-$USER-$(date +%Y%m%d%H%M%S%N)-ustd-pid"
+mkfifo -m 0600 "$pidfilepath"
+# It's not useful to run ustd in NOFAIL because it's running in the background
+ustd --pidfile "$pidfilepath" -o "$TRACE_DIR" >/dev/null 2>&1 &
+USTD_PID="$(<$pidfilepath)"