sasl_client_init()
initializes SASL. It must be called before any calls to
sasl_client_start. This call initializes all SASL client 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.
callbacks
specifies the base callbacks for all client connections. See the sasl_callbacks man page for more information
RETURN VALUE
sasl_client_init returns an integer which corresponds to one of the
following 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.