NAME
   CSSM_ModuleUnload - Deregister event notification callbacks (CDSA)

 SYNOPSIS
   # include <cssm.h>

        CSSM_RETURN CSSMAPI CSSM_ModuleUnload
        (const CSSM_GUID *ModuleGuid,
        CSSM_API_ModuleEventHandler AppNotifyCallback,
        void* AppNotifyCallbackCtx)

 LIBRARY
   Common Security Services Manager library (CDSA$INCSSM300_SHR.EXE)

 PARAMETERS
   ModuleGuid (input)
           The GUID of the module selected for unloading.

   AppNotifyCallback (input/optional)
           The event notification function to be deregistered. The
           function must have been provided by the caller in
           CSSM_ModuleLoad().

   AppNotifyCallbackCtx (input/optional)
           The event notification context that was provided in the
           corresponding call to CSSM_ModuleLoad().

 DESCRIPTION
   The function deregisters event notification callbacks for the caller
   identified by ModuleGuid. The CSSM_ModuleUnload() function is the
   analog call to CSSM_ModuleLoad().  If all callbacks registered with
   CSSM are removed, then CSSM unloads the service module that was loaded
   by calls to CSSM_ModuleLoad().  Calls to CSSM_ModuleUnload() that are
   not matched with a previous call to CSSM_ModuleLoad() result in an
   error.

   The CSSM uses the three input parameters ModuleGuid, AppNotifyCallback,
   and AppNotifyCallbackCtx to uniquely identify registered callbacks.

   This function should be invoked after all necessary calls to
   CSSM_ModuleDetach() have been performed.

 RETURN VALUE
   A CSSM_RETURN value indicating success or specifying a particular
   error condition. The value CSSM_OK indicates success. All other
   values represent an error condition.

 ERRORS
   Errors are described in the CDSA technical standard.  See CDSA.

        CSSMERR_CSSM_ADDIN_UNLOAD_FAILED
        CSSMERR_CSSM_EMM_UNLOAD_FAILED
        CSSMERR_CSSM_EVENT_NOTIFICATION_CALLBACK_NOT_FOUND

 SEE ALSO
   Intel CDSA Application Developer's Guide (see CDSA)