Causes a file (by default, \fBcontroller.pid\fR) to be created indicating
the PID of the running process. If \fIpidfile\fR is not specified, or
if it does not begin with \fB/\fR, then it is created in
-\fB@rundir@\fR.
+\fB@RUNDIR@\fR.
.TP
\fB-f\fR, \fB--force\fR