int sasl_server_init(const sasl_callback_t *callbacks,
const char *appname);
sasl_server_init() initializes SASL. It must be called before any calls to sasl_server_start, and only once per process. This call initializes all SASL mechanism drivers (e.g. authentication mechanisms). These are usually found in the /usr/lib/sasl2 directory but the directory may be overridden with the SASL_PATH environment variable (or at compile time).
callbacks specifies the base callbacks for all client connections. See the sasl_callbacks man page for more information.
appname is the name of the application. It is used for where to find the default configuration file.
sasl_server_init returns an integer which corresponds to one of the SASL error codes. SASL_OK is the only one that indicates success. All others indicate errors and should either be handled or the authentication session should be quit.