Description
The RSPD configuration file contains an integer with the number of seconds
to wait between updating the RSPD with current data. This number is
returned by this function, and should be used to specify the length of time
to wait in the waitNextEvent().
Returns
This function returns -1 if an error occurred, and 0 otherwise.
In case of error, the program will croak() with an appriopriate message.