csa_unregister_callback(3)

     NAME
          csa_unregister_callback - unregister the specified callback
          functions

     SYNOPSIS
          #include <csa.h>

          CSA_return_code csa_unregister_callback(CSA_session_handle session,
                                                  CSA_flags reason,
                                                  CSA_callback callback,
                                                  CSA_buffer client_data,
                                                  CSA_extension *unregister_callback_extensions);

     DESCRIPTION
          The csa_unregister_callback() function removes the specified
          callback procedure to the specified callback list.  Both the
          procedure and the client data must match for this function
          to remove the procedure.  Specifying a value of NULL for
          both callback and client data will cause all callbacks on
          the specified callback list(s) to be removed.

        Session (Session Handle)
          Opaque session handle that represents a session with the
          calendaring service.

          Session handles are created by a logon function call and
          invalidated with a logoff function call.  If the session
          handle is invalid, then the error
          CSA_E_INVALID_SESSION_HANDLE is returned.

        Reason (Flags)
          A bitmask of flags.  Unspecified flags should always be
          passed as 0.  Undocumented flags are reserved.  Each flag
          corresponds to a callback list.  Flag settings include:

             CSA_CB_CALENDAR_LOGON
                   If set, the new callback will be invoked when a the
                   calendar is accessed by a user.

             CSA_CB_CALENDAR_DELETED
                   If set, the new callback will be invoked when a
                   user requests that the calendar be deleted.

             CSA_CB_CALENDAR_ATTRIBUTE_UPDATED
                   If set, the new callback will be invoked whenever a
                   calendar attribute is updated.

             CSA_CB_ENTRY_ADDED
                   If set, the new callback will be invoked whenever
                   an entry is added to the calendar.

             CSA_CB_ENTRY_DELETED
                   If set, the new callback will be invoked whenever
                   an entry is deleted from the calendar.

             CSA_CB_ENTRY_UPDATED
                   If set, the new callback will be invoked whenever
                   an entry is updated on the calendar.  It is
                   implementation specific if the callback function is
                   invoked before or after the specified update type
                   occurs.

        Callback (Callback)
          Specifies the client procedure that should be removed from
          the specified callback list(s).

        Client Data (Opaque Data)
          A pointer to an application specific data structure that was
          specified when the callback procedure was registered.  This
          must match for the function to succeed.  This constraint
          allows the application to register the same function on more
          than one callback list with different client_data.  The
          instances of the callback function on the different callback
          lists will be treated independently by the calendar service.

        Unregister Callback Extensions (Extension)
          A pointer to an array of CSA_extension structures for this
          function.  The array may contain both input extensions for
          providing additional information to the function and output
          extensions for receiving information from the function.  A
          value of NULL indicates that the caller is not using any
          extensions.  See the extensions structure for more
          information.

     RETURN VALUE
        Unregister Callback Extensions (Extension)
          If output extensions were passed to the function in the
          extensions list, the results from the service will be
          available in the extension.  See the extensions structure
          for more information.  Whether the function succeeded or
          not, and, if not, why.  It may be success or one of the
          values listed under ERRORS below.

     ERRORS
          The csa_unregister_callback() function returns the following
          error values:

             CSA_E_CALLBACK_NOT_REGISTERED
                   The specified callback function was not registered.

             CSA_E_FAILURE
                   There was a general failure that does not fit the
                   description of any other error code.

             CSA_E_INSUFFICIENT_MEMORY

                   Insufficient memory was available to complete the
                   requested operation.

             CSA_E_INVALID_FLAG
                   A flag value in the flags argument was invalid.

             CSA_E_INVALID_FUNCTION_EXT
                   The function extension requested is invalid.

             CSA_E_INVALID_PARAMETER
                   A function parameter was invalid.

             CSA_E_INVALID_SESSION_HANDLE
                   The specified Session Handle is invalid or no
                   longer valid (e.g., after logging off).

             CSA_E_NO_AUTHORITY
                   The user has insufficient authority for this
                   function.

             CSA_E_NOT_SUPPORTED
                   The operation requested is not supported by this
                   implementation.

             CSA_E_SERVICE_UNAVAILABLE
                   The requested calendar service is unavailable.

             CSA_E_UNSUPPORTED_FLAG
                   The flag requested is not supported.

             CSA_E_UNSUPPORTED_FUNCTION_EXT
                   The specified function extension is not supported
                   or CSA_EXT_REQUIRED is set.

     SEE ALSO
          csacsa(5), csa_add_calendar(3), csa_add_entry(3),
          csa_call_callbacks(3), csa_delete_calendar(3),
          csa_delete_entry(3), csa_free(3), csa_free_time_search(3),
          csa_list_calendar_attributes(3), csa_list_calendars(3),
          csa_list_entries(3), csa_list_entry_attributes(3),
          csa_list_entry_sequence(3), csa_logoff(3), csa_logon(3),
          csa_look_up(3), csa_query_configuration(3),
          csa_read_calendar_attributes(3),
          csa_read_entry_attributes(3), csa_read_next_reminder(3),
          csa_register_callback(3), csa_update_calendar_attributes(3),
          csa_update_entry_attributes(3).