Description
This function allows your module to print messages to the RSPD's log file
(such as when a configuration error has occurred). If the RSPD is running
in debug mode, these messages will be printed to the console (otherwise they
will be seen in the log file). The $priority parameter can be one of three
values: 0, 1, or 2, correspoding with RSP_NOTE, RSP_WARN, and RSP_ERROR.
These are the three different error levels of RSPD log messages.
Returns
This function returns 0 if no error occurred, and -1 otherwise. In case
of error, the program will croak() with an appriopriate message.