-After (optionally) writing the PID file, assume the user ID of user
-and the GID of group, or, if the optional group was not given, the
-default group of user. Exit if the privileges are not sufficient to
-do so.
+On startup, write the process ID to \fIpidfile\fR.
+Delete the \fIpidfile\fR on exit.
+Failiure to create or delete the \fIpidfile\fR
+is non-fatal. If no \fB--pidfile\fR option is given, no PID file will be used.