Function: dbus-unregister-object

dbus-unregister-object is a byte-compiled function defined in dbus.el.gz.

Signature

(dbus-unregister-object OBJECT)

Documentation

Unregister OBJECT from D-Bus.

OBJECT must be the result of a preceding dbus-register-method, dbus-register-signal, dbus-register-property or dbus-register-monitor call. The function returns t if OBJECT has been unregistered, nil otherwise.

When OBJECT identifies the last method or property, which is registered for the respective service, Emacs releases its association to the service from D-Bus.

Source Code

;; Defined in /usr/src/emacs/lisp/net/dbus.el.gz
(defun dbus-unregister-object (object)
  "Unregister OBJECT from D-Bus.
OBJECT must be the result of a preceding `dbus-register-method',
`dbus-register-signal', `dbus-register-property' or
`dbus-register-monitor' call.  The function returns t if OBJECT
has been unregistered, nil otherwise.

When OBJECT identifies the last method or property, which is
registered for the respective service, Emacs releases its
association to the service from D-Bus."
  ;; Check parameter.
  (unless (and (consp object) (not (null (car object))) (consp (cdr object)))
    (signal 'wrong-type-argument (list 'D-Bus object)))

  ;; Find the corresponding entry in the hash table.
  (let* ((key (car object))
	 (type (car key))
	 (bus (cadr key))
	 (value (cadr object))
	 (service (car value))
	 (entry (gethash key dbus-registered-objects-table))
	 ret)
    ;; key has the structure (TYPE BUS INTERFACE MEMBER).
    ;; value has the structure (SERVICE PATH [HANDLER]).
    ;; entry has the structure ((UNAME SERVICE PATH MEMBER [RULE]) ...).
    ;; MEMBER is either a string (the handler), or a cons cell (a
    ;; property value).  UNAME and property values are not taken into
    ;; account for comparison.

    ;; Loop over the registered functions.
    (dolist (elt entry)
      (when (equal value (take (length value) (cdr elt)))
	(setq ret t)
	;; Compute new hash value.  If it is empty, remove it from the
	;; hash table.
	(unless (puthash key (delete elt entry) dbus-registered-objects-table)
	  (remhash key dbus-registered-objects-table))
	;; Remove match rule of signals.
	(when (eq type :signal)
	  (dbus-call-method
	   bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus
	   "RemoveMatch" (nth 4 elt)))
        ;; Delete monitor connection by reestablishing private bus.
        (when (eq type :monitor)
          (dbus-init-bus bus 'private))))

    ;; Check, whether there is still a registered function or property
    ;; for the given service.  If not, unregister the service from the
    ;; bus.
    (when (and service (memq type '(:method :property))
	       (not (catch :found
		      (progn
			(maphash
			 (lambda (k v)
                           (when (consp v)
			     (dolist (e v)
			       (ignore-errors
                                 (and
                                  ;; Type.
                                  (eq type (car k))
				  ;; Bus.
				  (equal bus (cadr k))
				  ;; Service.
				  (string-equal service (cadr e))
				  ;; Non-empty object path.
				  (nth 2 e)
				  (throw :found t))))))
			 dbus-registered-objects-table)
			nil))))
      (dbus-unregister-service bus service))
    ;; Return.
    ret))