Use mtaOptionString() to retrieve the string representation of an option’s value. If the option is specified in the option file, then its value and length will be returned via the str and str_len call arguments. If the option is not specified then no value is returned and the memory pointed at by str and str_len are left unchanged. This routine can be called with a NULL value for the opt_ctx argument. When this is done, mtaOptionString() immediately returns with a status code of zero and no option value is returned.