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1817 lines
67 KiB
EmacsLisp
1817 lines
67 KiB
EmacsLisp
;;; dbus.el --- Elisp bindings for D-Bus. -*- lexical-binding: t -*-
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;; Copyright (C) 2007-2018 Free Software Foundation, Inc.
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;; Author: Michael Albinus <michael.albinus@gmx.de>
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;; Keywords: comm, hardware
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package provides language bindings for the D-Bus API. D-Bus
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;; is a message bus system, a simple way for applications to talk to
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;; one another. See <http://dbus.freedesktop.org/> for details.
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;; Low-level language bindings are implemented in src/dbusbind.c.
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;; D-Bus support in the Emacs core can be disabled with configuration
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;; option "--without-dbus".
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;;; Code:
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;; Declare used subroutines and variables.
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(declare-function dbus-message-internal "dbusbind.c")
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(declare-function dbus--init-bus "dbusbind.c")
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(defvar dbus-message-type-invalid)
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(defvar dbus-message-type-method-call)
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(defvar dbus-message-type-method-return)
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(defvar dbus-message-type-error)
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(defvar dbus-message-type-signal)
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(defvar dbus-debug)
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(defvar dbus-registered-objects-table)
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;; Pacify byte compiler.
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(eval-when-compile (require 'cl-lib))
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(require 'xml)
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(defconst dbus-service-dbus "org.freedesktop.DBus"
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"The bus name used to talk to the bus itself.")
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(defconst dbus-path-dbus "/org/freedesktop/DBus"
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"The object path used to talk to the bus itself.")
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(defconst dbus-path-local (concat dbus-path-dbus "/Local")
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"The object path used in local/in-process-generated messages.")
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;; Default D-Bus interfaces.
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(defconst dbus-interface-dbus "org.freedesktop.DBus"
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"The interface exported by the service `dbus-service-dbus'.")
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(defconst dbus-interface-peer (concat dbus-interface-dbus ".Peer")
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"The interface for peer objects.
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See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-peer'.")
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;; <interface name="org.freedesktop.DBus.Peer">
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;; <method name="Ping">
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;; </method>
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;; <method name="GetMachineId">
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;; <arg name="machine_uuid" type="s" direction="out"/>
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;; </method>
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;; </interface>
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(defconst dbus-interface-introspectable
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(concat dbus-interface-dbus ".Introspectable")
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"The interface supported by introspectable objects.
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See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-introspectable'.")
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;; <interface name="org.freedesktop.DBus.Introspectable">
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;; <method name="Introspect">
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;; <arg name="data" type="s" direction="out"/>
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;; </method>
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;; </interface>
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(defconst dbus-interface-properties (concat dbus-interface-dbus ".Properties")
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"The interface for property objects.
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See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties'.")
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;; <interface name="org.freedesktop.DBus.Properties">
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;; <method name="Get">
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;; <arg name="interface" type="s" direction="in"/>
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;; <arg name="propname" type="s" direction="in"/>
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;; <arg name="value" type="v" direction="out"/>
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;; </method>
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;; <method name="Set">
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;; <arg name="interface" type="s" direction="in"/>
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;; <arg name="propname" type="s" direction="in"/>
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;; <arg name="value" type="v" direction="in"/>
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;; </method>
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;; <method name="GetAll">
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;; <arg name="interface" type="s" direction="in"/>
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;; <arg name="props" type="a{sv}" direction="out"/>
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;; </method>
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;; <signal name="PropertiesChanged">
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;; <arg name="interface" type="s"/>
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;; <arg name="changed_properties" type="a{sv}"/>
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;; <arg name="invalidated_properties" type="as"/>
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;; </signal>
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;; </interface>
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(defconst dbus-interface-objectmanager
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(concat dbus-interface-dbus ".ObjectManager")
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"The object manager interface.
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See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager'.")
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;; <interface name="org.freedesktop.DBus.ObjectManager">
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;; <method name="GetManagedObjects">
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;; <arg name="object_paths_interfaces_and_properties"
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;; type="a{oa{sa{sv}}}" direction="out"/>
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;; </method>
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;; <signal name="InterfacesAdded">
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;; <arg name="object_path" type="o"/>
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;; <arg name="interfaces_and_properties" type="a{sa{sv}}"/>
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;; </signal>
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;; <signal name="InterfacesRemoved">
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;; <arg name="object_path" type="o"/>
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;; <arg name="interfaces" type="as"/>
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;; </signal>
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;; </interface>
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(defconst dbus-interface-local (concat dbus-interface-dbus ".Local")
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"An interface whose methods can only be invoked by the local implementation.")
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;; <interface name="org.freedesktop.DBus.Local">
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;; <signal name="Disconnected">
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;; <arg name="object_path" type="o"/>
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;; </signal>
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;; </interface>
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;; Emacs defaults.
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(defconst dbus-service-emacs "org.gnu.Emacs"
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"The well known service name of Emacs.")
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(defconst dbus-path-emacs "/org/gnu/Emacs"
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"The object path namespace used by Emacs.
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All object paths provided by the service `dbus-service-emacs'
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shall be subdirectories of this path.")
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(defconst dbus-interface-emacs "org.gnu.Emacs"
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"The interface namespace used by Emacs.")
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;; D-Bus constants.
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(defmacro dbus-ignore-errors (&rest body)
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"Execute BODY; signal D-Bus error when `dbus-debug' is non-nil.
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Otherwise, return result of last form in BODY, or all other errors."
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(declare (indent 0) (debug t))
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`(condition-case err
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(progn ,@body)
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(dbus-error (when dbus-debug (signal (car err) (cdr err))))))
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(font-lock-add-keywords 'emacs-lisp-mode '("\\<dbus-ignore-errors\\>"))
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(define-obsolete-variable-alias 'dbus-event-error-hooks
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'dbus-event-error-functions "24.3")
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(defvar dbus-event-error-functions '(dbus-notice-synchronous-call-errors)
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"Functions to be called when a D-Bus error happens in the event handler.
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Every function must accept two arguments, the event and the error variable
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caught in `condition-case' by `dbus-error'.")
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;;; Basic D-Bus message functions.
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(defvar dbus-return-values-table (make-hash-table :test 'equal)
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"Hash table for temporary storing arguments of reply messages.
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A key in this hash table is a list (:serial BUS SERIAL), like in
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`dbus-registered-objects-table'. BUS is either a Lisp symbol,
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`:system' or `:session', or a string denoting the bus address.
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SERIAL is the serial number of the reply message.
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The value of an entry is a cons (STATE . RESULT). STATE can be
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either `:pending' (we are still waiting for the result),
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`:complete' (the result is available) or `:error' (the reply
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message was an error message).")
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(defun dbus-call-method-handler (&rest args)
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"Handler for reply messages of asynchronous D-Bus message calls.
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It calls the function stored in `dbus-registered-objects-table'.
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The result will be made available in `dbus-return-values-table'."
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(let* ((key (list :serial
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(dbus-event-bus-name last-input-event)
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(dbus-event-serial-number last-input-event)))
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(result (gethash key dbus-return-values-table)))
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(when (consp result)
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(setcar result :complete)
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(setcdr result (if (= (length args) 1) (car args) args)))))
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(defun dbus-notice-synchronous-call-errors (ev er)
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"Detect errors resulting from pending synchronous calls."
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(let* ((key (list :serial
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(dbus-event-bus-name ev)
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(dbus-event-serial-number ev)))
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(result (gethash key dbus-return-values-table)))
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(when (consp result)
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(setcar result :error)
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(setcdr result er))))
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(defun dbus-call-method (bus service path interface method &rest args)
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"Call METHOD on the D-Bus BUS.
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BUS is either a Lisp symbol, `:system' or `:session', or a string
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denoting the bus address.
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SERVICE is the D-Bus service name to be used. PATH is the D-Bus
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object path SERVICE is registered at. INTERFACE is an interface
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offered by SERVICE. It must provide METHOD.
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If the parameter `:timeout' is given, the following integer TIMEOUT
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specifies the maximum number of milliseconds the method call must
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return. The default value is 25,000. If the method call doesn't
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return in time, a D-Bus error is raised.
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All other arguments ARGS are passed to METHOD as arguments. They are
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converted into D-Bus types via the following rules:
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t and nil => DBUS_TYPE_BOOLEAN
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number => DBUS_TYPE_UINT32
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integer => DBUS_TYPE_INT32
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float => DBUS_TYPE_DOUBLE
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string => DBUS_TYPE_STRING
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list => DBUS_TYPE_ARRAY
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All arguments can be preceded by a type symbol. For details about
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type symbols, see Info node `(dbus)Type Conversion'.
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`dbus-call-method' returns the resulting values of METHOD as a list of
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Lisp objects. The type conversion happens the other direction as for
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input arguments. It follows the mapping rules:
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DBUS_TYPE_BOOLEAN => t or nil
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DBUS_TYPE_BYTE => number
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DBUS_TYPE_UINT16 => number
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DBUS_TYPE_INT16 => integer
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DBUS_TYPE_UINT32 => number or float
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DBUS_TYPE_UNIX_FD => number or float
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DBUS_TYPE_INT32 => integer or float
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DBUS_TYPE_UINT64 => number or float
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DBUS_TYPE_INT64 => integer or float
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DBUS_TYPE_DOUBLE => float
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DBUS_TYPE_STRING => string
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DBUS_TYPE_OBJECT_PATH => string
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DBUS_TYPE_SIGNATURE => string
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DBUS_TYPE_ARRAY => list
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DBUS_TYPE_VARIANT => list
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DBUS_TYPE_STRUCT => list
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DBUS_TYPE_DICT_ENTRY => list
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Example:
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\(dbus-call-method
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:session \"org.gnome.seahorse\" \"/org/gnome/seahorse/keys/openpgp\"
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\"org.gnome.seahorse.Keys\" \"GetKeyField\"
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\"openpgp:657984B8C7A966DD\" \"simple-name\")
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=> (t (\"Philip R. Zimmermann\"))
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If the result of the METHOD call is just one value, the converted Lisp
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object is returned instead of a list containing this single Lisp object.
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\(dbus-call-method
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:system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\"
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\"org.freedesktop.Hal.Device\" \"GetPropertyString\"
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\"system.kernel.machine\")
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=> \"i686\""
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(or (featurep 'dbusbind)
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(signal 'dbus-error (list "Emacs not compiled with dbus support")))
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(or (memq bus '(:system :session)) (stringp bus)
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(signal 'wrong-type-argument (list 'keywordp bus)))
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(or (stringp service)
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(signal 'wrong-type-argument (list 'stringp service)))
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(or (stringp path)
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(signal 'wrong-type-argument (list 'stringp path)))
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(or (stringp interface)
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(signal 'wrong-type-argument (list 'stringp interface)))
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(or (stringp method)
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(signal 'wrong-type-argument (list 'stringp method)))
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(let ((timeout (plist-get args :timeout))
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(check-interval 0.001)
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(key
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(apply
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'dbus-message-internal dbus-message-type-method-call
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bus service path interface method 'dbus-call-method-handler args))
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(result (cons :pending nil)))
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;; Wait until `dbus-call-method-handler' has put the result into
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;; `dbus-return-values-table'. If no timeout is given, use the
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;; default 25". Events which are not from D-Bus must be restored.
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;; `read-event' performs a redisplay. This must be suppressed; it
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;; hurts when reading D-Bus events asynchronously.
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;; Work around bug#16775 by busy-waiting with gradual backoff for
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;; dbus calls to complete. A better approach would involve either
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;; adding arbitrary wait condition support to read-event or
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;; restructuring dbus as a kind of process object. Poll at most
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;; about once per second for completion.
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(puthash key result dbus-return-values-table)
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(unwind-protect
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(progn
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(with-timeout ((if timeout (/ timeout 1000.0) 25)
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(signal 'dbus-error (list "call timed out")))
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(while (eq (car result) :pending)
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(let ((event (let ((inhibit-redisplay t) unread-command-events)
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(read-event nil nil check-interval))))
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(when event
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(if (ignore-errors (dbus-check-event event))
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(setf result (gethash key dbus-return-values-table))
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(setf unread-command-events
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(nconc unread-command-events
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(cons event nil)))))
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(when (< check-interval 1)
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(setf check-interval (* check-interval 1.05))))))
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(when (eq (car result) :error)
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(signal (cadr result) (cddr result)))
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(cdr result))
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(remhash key dbus-return-values-table))))
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;; `dbus-call-method' works non-blocking now.
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(defalias 'dbus-call-method-non-blocking 'dbus-call-method)
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(make-obsolete 'dbus-call-method-non-blocking 'dbus-call-method "24.3")
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(defun dbus-call-method-asynchronously
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(bus service path interface method handler &rest args)
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"Call METHOD on the D-Bus BUS asynchronously.
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BUS is either a Lisp symbol, `:system' or `:session', or a string
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denoting the bus address.
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SERVICE is the D-Bus service name to be used. PATH is the D-Bus
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object path SERVICE is registered at. INTERFACE is an interface
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offered by SERVICE. It must provide METHOD.
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HANDLER is a Lisp function, which is called when the corresponding
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return message has arrived. If HANDLER is nil, no return message
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will be expected.
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If the parameter `:timeout' is given, the following integer TIMEOUT
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specifies the maximum number of milliseconds the method call must
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return. The default value is 25,000. If the method call doesn't
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return in time, a D-Bus error is raised.
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All other arguments ARGS are passed to METHOD as arguments. They are
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converted into D-Bus types via the following rules:
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t and nil => DBUS_TYPE_BOOLEAN
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number => DBUS_TYPE_UINT32
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integer => DBUS_TYPE_INT32
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float => DBUS_TYPE_DOUBLE
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string => DBUS_TYPE_STRING
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list => DBUS_TYPE_ARRAY
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All arguments can be preceded by a type symbol. For details about
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type symbols, see Info node `(dbus)Type Conversion'.
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If HANDLER is a Lisp function, the function returns a key into the
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hash table `dbus-registered-objects-table'. The corresponding entry
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in the hash table is removed, when the return message has been arrived,
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and HANDLER is called.
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Example:
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\(dbus-call-method-asynchronously
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:system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\"
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\"org.freedesktop.Hal.Device\" \"GetPropertyString\" \\='message
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\"system.kernel.machine\")
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=> (:serial :system 2)
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-| i686"
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(or (featurep 'dbusbind)
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(signal 'dbus-error (list "Emacs not compiled with dbus support")))
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(or (memq bus '(:system :session)) (stringp bus)
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(signal 'wrong-type-argument (list 'keywordp bus)))
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(or (stringp service)
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(signal 'wrong-type-argument (list 'stringp service)))
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(or (stringp path)
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(signal 'wrong-type-argument (list 'stringp path)))
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(or (stringp interface)
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(signal 'wrong-type-argument (list 'stringp interface)))
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(or (stringp method)
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(signal 'wrong-type-argument (list 'stringp method)))
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(or (null handler) (functionp handler)
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(signal 'wrong-type-argument (list 'functionp handler)))
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(apply 'dbus-message-internal dbus-message-type-method-call
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bus service path interface method handler args))
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(defun dbus-send-signal (bus service path interface signal &rest args)
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"Send signal SIGNAL on the D-Bus BUS.
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BUS is either a Lisp symbol, `:system' or `:session', or a string
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denoting the bus address. The signal is sent from the D-Bus object
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Emacs is registered at BUS.
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SERVICE is the D-Bus name SIGNAL is sent to. It can be either a known
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name or a unique name. If SERVICE is nil, the signal is sent as
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broadcast message. PATH is the D-Bus object path SIGNAL is sent from.
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INTERFACE is an interface available at PATH. It must provide signal
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SIGNAL.
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All other arguments ARGS are passed to SIGNAL as arguments. They are
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converted into D-Bus types via the following rules:
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t and nil => DBUS_TYPE_BOOLEAN
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number => DBUS_TYPE_UINT32
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integer => DBUS_TYPE_INT32
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float => DBUS_TYPE_DOUBLE
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string => DBUS_TYPE_STRING
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list => DBUS_TYPE_ARRAY
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All arguments can be preceded by a type symbol. For details about
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type symbols, see Info node `(dbus)Type Conversion'.
|
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Example:
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\(dbus-send-signal
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:session nil \"/org/gnu/Emacs\" \"org.gnu.Emacs.FileManager\"
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\"FileModified\" \"/home/albinus/.emacs\")"
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(or (featurep 'dbusbind)
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(signal 'dbus-error (list "Emacs not compiled with dbus support")))
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(or (memq bus '(:system :session)) (stringp bus)
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(signal 'wrong-type-argument (list 'keywordp bus)))
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(or (null service) (stringp service)
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(signal 'wrong-type-argument (list 'stringp service)))
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(or (stringp path)
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(signal 'wrong-type-argument (list 'stringp path)))
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(or (stringp interface)
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(signal 'wrong-type-argument (list 'stringp interface)))
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(or (stringp signal)
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(signal 'wrong-type-argument (list 'stringp signal)))
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(apply 'dbus-message-internal dbus-message-type-signal
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bus service path interface signal args))
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(defun dbus-method-return-internal (bus service serial &rest args)
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"Return for message SERIAL on the D-Bus BUS.
|
||
This is an internal function, it shall not be used outside dbus.el."
|
||
|
||
(or (featurep 'dbusbind)
|
||
(signal 'dbus-error (list "Emacs not compiled with dbus support")))
|
||
(or (memq bus '(:system :session)) (stringp bus)
|
||
(signal 'wrong-type-argument (list 'keywordp bus)))
|
||
(or (stringp service)
|
||
(signal 'wrong-type-argument (list 'stringp service)))
|
||
(or (natnump serial)
|
||
(signal 'wrong-type-argument (list 'natnump serial)))
|
||
|
||
(apply 'dbus-message-internal dbus-message-type-method-return
|
||
bus service serial args))
|
||
|
||
(defun dbus-method-error-internal (bus service serial &rest args)
|
||
"Return error message for message SERIAL on the D-Bus BUS.
|
||
This is an internal function, it shall not be used outside dbus.el."
|
||
|
||
(or (featurep 'dbusbind)
|
||
(signal 'dbus-error (list "Emacs not compiled with dbus support")))
|
||
(or (memq bus '(:system :session)) (stringp bus)
|
||
(signal 'wrong-type-argument (list 'keywordp bus)))
|
||
(or (stringp service)
|
||
(signal 'wrong-type-argument (list 'stringp service)))
|
||
(or (natnump serial)
|
||
(signal 'wrong-type-argument (list 'natnump serial)))
|
||
|
||
(apply 'dbus-message-internal dbus-message-type-error
|
||
bus service serial args))
|
||
|
||
|
||
;;; Hash table of registered functions.
|
||
|
||
(defun dbus-list-hash-table ()
|
||
"Returns all registered member registrations to D-Bus.
|
||
The return value is a list, with elements of kind (KEY . VALUE).
|
||
See `dbus-registered-objects-table' for a description of the
|
||
hash table."
|
||
(let (result)
|
||
(maphash
|
||
(lambda (key value) (push (cons key value) result))
|
||
dbus-registered-objects-table)
|
||
result))
|
||
|
||
(defun dbus-setenv (bus variable value)
|
||
"Set the value of the BUS environment variable named VARIABLE to VALUE.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address. Both VARIABLE and VALUE should be strings.
|
||
|
||
Normally, services inherit the environment of the BUS daemon. This
|
||
function adds to or modifies that environment when activating services.
|
||
|
||
Some bus instances, such as `:system', may disable setting the environment."
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus
|
||
dbus-interface-dbus "UpdateActivationEnvironment"
|
||
`(:array (:dict-entry ,variable ,value))))
|
||
|
||
(defun dbus-register-service (bus service &rest flags)
|
||
"Register known name SERVICE on the D-Bus BUS.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address.
|
||
|
||
SERVICE is the D-Bus service name that should be registered. It must
|
||
be a known name.
|
||
|
||
FLAGS are keywords, which control how the service name is registered.
|
||
The following keywords are recognized:
|
||
|
||
`:allow-replacement': Allow another service to become the primary
|
||
owner if requested.
|
||
|
||
`:replace-existing': Request to replace the current primary owner.
|
||
|
||
`:do-not-queue': If we can not become the primary owner do not place
|
||
us in the queue.
|
||
|
||
The function returns a keyword, indicating the result of the
|
||
operation. One of the following keywords is returned:
|
||
|
||
`:primary-owner': Service has become the primary owner of the
|
||
requested name.
|
||
|
||
`:in-queue': Service could not become the primary owner and has been
|
||
placed in the queue.
|
||
|
||
`:exists': Service is already in the queue.
|
||
|
||
`:already-owner': Service is already the primary owner."
|
||
|
||
;; Add Peer handler.
|
||
(dbus-register-method
|
||
bus service nil dbus-interface-peer "Ping" 'dbus-peer-handler 'dont-register)
|
||
|
||
;; Add ObjectManager handler.
|
||
(dbus-register-method
|
||
bus service nil dbus-interface-objectmanager "GetManagedObjects"
|
||
'dbus-managed-objects-handler 'dont-register)
|
||
|
||
(let ((arg 0)
|
||
reply)
|
||
(dolist (flag flags)
|
||
(setq arg
|
||
(+ arg
|
||
(pcase flag
|
||
(:allow-replacement 1)
|
||
(:replace-existing 2)
|
||
(:do-not-queue 4)
|
||
(_ (signal 'wrong-type-argument (list flag)))))))
|
||
(setq reply (dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus
|
||
"RequestName" service arg))
|
||
(pcase reply
|
||
(1 :primary-owner)
|
||
(2 :in-queue)
|
||
(3 :exists)
|
||
(4 :already-owner)
|
||
(_ (signal 'dbus-error (list "Could not register service" service))))))
|
||
|
||
(defun dbus-unregister-service (bus service)
|
||
"Unregister all objects related to SERVICE from D-Bus BUS.
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address. SERVICE must be a known service name.
|
||
|
||
The function returns a keyword, indicating the result of the
|
||
operation. One of the following keywords is returned:
|
||
|
||
`:released': We successfully released the service.
|
||
|
||
`:non-existent': Service name does not exist on this bus.
|
||
|
||
`:not-owner': We are neither the primary owner nor waiting in the
|
||
queue of this service."
|
||
|
||
(maphash
|
||
(lambda (key value)
|
||
(unless (equal :serial (car key))
|
||
(dolist (elt value)
|
||
(ignore-errors
|
||
(when (and (equal bus (cadr key)) (string-equal service (cadr elt)))
|
||
(unless
|
||
(puthash key (delete elt value) dbus-registered-objects-table)
|
||
(remhash key dbus-registered-objects-table)))))))
|
||
dbus-registered-objects-table)
|
||
(let ((reply (dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus
|
||
"ReleaseName" service)))
|
||
(pcase reply
|
||
(1 :released)
|
||
(2 :non-existent)
|
||
(3 :not-owner)
|
||
(_ (signal 'dbus-error (list "Could not unregister service" service))))))
|
||
|
||
(defun dbus-register-signal
|
||
(bus service path interface signal handler &rest args)
|
||
"Register for a signal on the D-Bus BUS.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address.
|
||
|
||
SERVICE is the D-Bus service name used by the sending D-Bus object.
|
||
It can be either a known name or the unique name of the D-Bus object
|
||
sending the signal.
|
||
|
||
PATH is the D-Bus object path SERVICE is registered. INTERFACE
|
||
is an interface offered by SERVICE. It must provide SIGNAL.
|
||
HANDLER is a Lisp function to be called when the signal is
|
||
received. It must accept as arguments the values SIGNAL is
|
||
sending.
|
||
|
||
SERVICE, PATH, INTERFACE and SIGNAL can be nil. This is
|
||
interpreted as a wildcard for the respective argument.
|
||
|
||
The remaining arguments ARGS can be keywords or keyword string pairs.
|
||
The meaning is as follows:
|
||
|
||
`:argN' STRING:
|
||
`:pathN' STRING: This stands for the Nth argument of the
|
||
signal. `:pathN' arguments can be used for object path wildcard
|
||
matches as specified by D-Bus, while an `:argN' argument
|
||
requires an exact match.
|
||
|
||
`:arg-namespace' STRING: Register for the signals, which first
|
||
argument defines the service or interface namespace STRING.
|
||
|
||
`:path-namespace' STRING: Register for the object path namespace
|
||
STRING. All signals sent from an object path, which has STRING as
|
||
the preceding string, are matched. This requires PATH to be nil.
|
||
|
||
`:eavesdrop': Register for unicast signals which are not directed
|
||
to the D-Bus object Emacs is registered at D-Bus BUS, if the
|
||
security policy of BUS allows this.
|
||
|
||
Example:
|
||
|
||
\(defun my-signal-handler (device)
|
||
(message \"Device %s added\" device))
|
||
|
||
\(dbus-register-signal
|
||
:system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\"
|
||
\"org.freedesktop.Hal.Manager\" \"DeviceAdded\" \\='my-signal-handler)
|
||
|
||
=> ((:signal :system \"org.freedesktop.Hal.Manager\" \"DeviceAdded\")
|
||
(\"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\" my-signal-handler))
|
||
|
||
`dbus-register-signal' returns an object, which can be used in
|
||
`dbus-unregister-object' for removing the registration."
|
||
|
||
(let ((counter 0)
|
||
(rule "type='signal'")
|
||
uname key key1 value)
|
||
|
||
;; Retrieve unique name of service. If service is a known name,
|
||
;; we will register for the corresponding unique name, if any.
|
||
;; Signals are sent always with the unique name as sender. Note:
|
||
;; the unique name of `dbus-service-dbus' is that string itself.
|
||
(if (and (stringp service)
|
||
(not (zerop (length service)))
|
||
(not (string-equal service dbus-service-dbus))
|
||
(not (string-match "^:" service)))
|
||
(setq uname (dbus-get-name-owner bus service))
|
||
(setq uname service))
|
||
|
||
(setq rule (concat rule
|
||
(when uname (format ",sender='%s'" uname))
|
||
(when interface (format ",interface='%s'" interface))
|
||
(when signal (format ",member='%s'" signal))
|
||
(when path (format ",path='%s'" path))))
|
||
|
||
;; Add arguments to the rule.
|
||
(if (or (stringp (car args)) (null (car args)))
|
||
;; As backward compatibility option, we allow just strings.
|
||
(dolist (arg args)
|
||
(if (stringp arg)
|
||
(setq rule (concat rule (format ",arg%d='%s'" counter arg)))
|
||
(if arg (signal 'wrong-type-argument (list "Wrong argument" arg))))
|
||
(setq counter (1+ counter)))
|
||
|
||
;; Parse keywords.
|
||
(while args
|
||
(setq
|
||
key (car args)
|
||
rule (concat
|
||
rule
|
||
(cond
|
||
;; `:arg0' .. `:arg63', `:path0' .. `:path63'.
|
||
((and (keywordp key)
|
||
(string-match
|
||
"^:\\(arg\\|path\\)\\([[:digit:]]+\\)$"
|
||
(symbol-name key)))
|
||
(setq counter (match-string 2 (symbol-name key))
|
||
args (cdr args)
|
||
value (car args))
|
||
(unless (and (<= (string-to-number counter) 63)
|
||
(stringp value))
|
||
(signal 'wrong-type-argument
|
||
(list "Wrong argument" key value)))
|
||
(format
|
||
",arg%s%s='%s'"
|
||
counter
|
||
(if (string-equal (match-string 1 (symbol-name key)) "path")
|
||
"path" "")
|
||
value))
|
||
;; `:arg-namespace', `:path-namespace'.
|
||
((and (keywordp key)
|
||
(string-match
|
||
"^:\\(arg\\|path\\)-namespace$" (symbol-name key)))
|
||
(setq args (cdr args)
|
||
value (car args))
|
||
(unless (stringp value)
|
||
(signal 'wrong-type-argument
|
||
(list "Wrong argument" key value)))
|
||
(format
|
||
",%s='%s'"
|
||
(if (string-equal (match-string 1 (symbol-name key)) "path")
|
||
"path_namespace" "arg0namespace")
|
||
value))
|
||
;; `:eavesdrop'.
|
||
((eq key :eavesdrop)
|
||
",eavesdrop='true'")
|
||
(t (signal 'wrong-type-argument (list "Wrong argument" key)))))
|
||
args (cdr args))))
|
||
|
||
;; Add the rule to the bus.
|
||
(condition-case err
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus
|
||
"AddMatch" rule)
|
||
(dbus-error
|
||
(if (not (string-match "eavesdrop" rule))
|
||
(signal (car err) (cdr err))
|
||
;; The D-Bus spec says we shall fall back to a rule without eavesdrop.
|
||
(when dbus-debug (message "Removing eavesdrop from rule %s" rule))
|
||
(setq rule (replace-regexp-in-string ",eavesdrop='true'" "" rule))
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus
|
||
"AddMatch" rule))))
|
||
|
||
(when dbus-debug (message "Matching rule \"%s\" created" rule))
|
||
|
||
;; Create a hash table entry.
|
||
(setq key (list :signal bus interface signal)
|
||
key1 (list uname service path handler rule)
|
||
value (gethash key dbus-registered-objects-table))
|
||
(unless (member key1 value)
|
||
(puthash key (cons key1 value) dbus-registered-objects-table))
|
||
|
||
;; Return the object.
|
||
(list key (list service path handler))))
|
||
|
||
(defun dbus-register-method
|
||
(bus service path interface method handler &optional dont-register-service)
|
||
"Register for method METHOD on the D-Bus BUS.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address.
|
||
|
||
SERVICE is the D-Bus service name of the D-Bus object METHOD is
|
||
registered for. It must be a known name (See discussion of
|
||
DONT-REGISTER-SERVICE below).
|
||
|
||
PATH is the D-Bus object path SERVICE is registered (See discussion of
|
||
DONT-REGISTER-SERVICE below). INTERFACE is the interface offered by
|
||
SERVICE. It must provide METHOD.
|
||
|
||
HANDLER is a Lisp function to be called when a method call is
|
||
received. It must accept the input arguments of METHOD. The return
|
||
value of HANDLER is used for composing the returning D-Bus message.
|
||
In case HANDLER shall return a reply message with an empty argument
|
||
list, HANDLER must return the symbol `:ignore'.
|
||
|
||
When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is not
|
||
registered. This means that other D-Bus clients have no way of
|
||
noticing the newly registered method. When interfaces are constructed
|
||
incrementally by adding single methods or properties at a time,
|
||
DONT-REGISTER-SERVICE can be used to prevent other clients from
|
||
discovering the still incomplete interface."
|
||
|
||
;; Register SERVICE.
|
||
(unless (or dont-register-service
|
||
(member service (dbus-list-names bus)))
|
||
(dbus-register-service bus service))
|
||
|
||
;; Create a hash table entry. We use nil for the unique name,
|
||
;; because the method might be called from anybody.
|
||
(let* ((key (list :method bus interface method))
|
||
(key1 (list nil service path handler))
|
||
(value (gethash key dbus-registered-objects-table)))
|
||
|
||
(unless (member key1 value)
|
||
(puthash key (cons key1 value) dbus-registered-objects-table))
|
||
|
||
;; Return the object.
|
||
(list key (list service path handler))))
|
||
|
||
(defun dbus-unregister-object (object)
|
||
"Unregister OBJECT from D-Bus.
|
||
OBJECT must be the result of a preceding `dbus-register-method',
|
||
`dbus-register-property' or `dbus-register-signal' call. It
|
||
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
|
||
(butlast (cdr elt) (- (length (cdr elt)) (length value))))
|
||
(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)))))
|
||
|
||
;; 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)
|
||
(dolist (e v)
|
||
(ignore-errors
|
||
(and
|
||
;; 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))
|
||
|
||
|
||
;;; D-Bus type conversion.
|
||
|
||
(defun dbus-string-to-byte-array (string)
|
||
"Transforms STRING to list (:array :byte c1 :byte c2 ...).
|
||
STRING shall be UTF8 coded."
|
||
(if (zerop (length string))
|
||
'(:array :signature "y")
|
||
(let (result)
|
||
(dolist (elt (string-to-list string) (append '(:array) result))
|
||
(setq result (append result (list :byte elt)))))))
|
||
|
||
(defun dbus-byte-array-to-string (byte-array &optional multibyte)
|
||
"Transforms BYTE-ARRAY into UTF8 coded string.
|
||
BYTE-ARRAY must be a list of structure (c1 c2 ...), or a byte
|
||
array as produced by `dbus-string-to-byte-array'. The resulting
|
||
string is unibyte encoded, unless MULTIBYTE is non-nil."
|
||
(apply
|
||
(if multibyte 'string 'unibyte-string)
|
||
(if (equal byte-array '(:array :signature "y"))
|
||
nil
|
||
(let (result)
|
||
(dolist (elt byte-array result)
|
||
(when (characterp elt) (setq result (append result `(,elt)))))))))
|
||
|
||
(defun dbus-escape-as-identifier (string)
|
||
"Escape an arbitrary STRING so it follows the rules for a C identifier.
|
||
The escaped string can be used as object path component, interface element
|
||
component, bus name component or member name in D-Bus.
|
||
|
||
The escaping consists of replacing all non-alphanumerics, and the
|
||
first character if it's a digit, with an underscore and two
|
||
lower-case hex digits:
|
||
|
||
\"0123abc_xyz\\x01\\xff\" -> \"_30123abc_5fxyz_01_ff\"
|
||
|
||
i.e. similar to URI encoding, but with \"_\" taking the role of \"%\",
|
||
and a smaller allowed set. As a special case, \"\" is escaped to
|
||
\"_\".
|
||
|
||
Returns the escaped string. Algorithm taken from
|
||
telepathy-glib's `tp_escape_as_identifier'."
|
||
(if (zerop (length string))
|
||
"_"
|
||
(replace-regexp-in-string
|
||
"^[0-9]\\|[^A-Za-z0-9]"
|
||
(lambda (x) (format "_%2x" (aref x 0)))
|
||
string)))
|
||
|
||
(defun dbus-unescape-from-identifier (string)
|
||
"Retrieve the original string from the encoded STRING as unibyte string.
|
||
STRING must have been encoded with `dbus-escape-as-identifier'."
|
||
(if (string-equal string "_")
|
||
""
|
||
(replace-regexp-in-string
|
||
"_.."
|
||
(lambda (x) (byte-to-string (string-to-number (substring x 1) 16)))
|
||
string)))
|
||
|
||
|
||
;;; D-Bus events.
|
||
|
||
(defun dbus-check-event (event)
|
||
"Checks whether EVENT is a well formed D-Bus event.
|
||
EVENT is a list which starts with symbol `dbus-event':
|
||
|
||
(dbus-event BUS TYPE SERIAL SERVICE PATH INTERFACE MEMBER HANDLER &rest ARGS)
|
||
|
||
BUS identifies the D-Bus the message is coming from. It is
|
||
either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address. TYPE is the D-Bus message type which
|
||
has caused the event, SERIAL is the serial number of the received
|
||
D-Bus message. SERVICE and PATH are the unique name and the
|
||
object path of the D-Bus object emitting the message. INTERFACE
|
||
and MEMBER denote the message which has been sent. HANDLER is
|
||
the function which has been registered for this message. ARGS
|
||
are the arguments passed to HANDLER, when it is called during
|
||
event handling in `dbus-handle-event'.
|
||
|
||
This function raises a `dbus-error' signal in case the event is
|
||
not well formed."
|
||
(when dbus-debug (message "DBus-Event %s" event))
|
||
(unless (and (listp event)
|
||
(eq (car event) 'dbus-event)
|
||
;; Bus symbol.
|
||
(or (symbolp (nth 1 event))
|
||
(stringp (nth 1 event)))
|
||
;; Type.
|
||
(and (natnump (nth 2 event))
|
||
(< dbus-message-type-invalid (nth 2 event)))
|
||
;; Serial.
|
||
(natnump (nth 3 event))
|
||
;; Service.
|
||
(or (= dbus-message-type-method-return (nth 2 event))
|
||
(= dbus-message-type-error (nth 2 event))
|
||
(or (stringp (nth 4 event))
|
||
(null (nth 4 event))))
|
||
;; Object path.
|
||
(or (= dbus-message-type-method-return (nth 2 event))
|
||
(= dbus-message-type-error (nth 2 event))
|
||
(stringp (nth 5 event)))
|
||
;; Interface.
|
||
(or (= dbus-message-type-method-return (nth 2 event))
|
||
(= dbus-message-type-error (nth 2 event))
|
||
(stringp (nth 6 event)))
|
||
;; Member.
|
||
(or (= dbus-message-type-method-return (nth 2 event))
|
||
(= dbus-message-type-error (nth 2 event))
|
||
(stringp (nth 7 event)))
|
||
;; Handler.
|
||
(functionp (nth 8 event)))
|
||
(signal 'dbus-error (list "Not a valid D-Bus event" event))))
|
||
|
||
;;;###autoload
|
||
(defun dbus-handle-event (event)
|
||
"Handle events from the D-Bus.
|
||
EVENT is a D-Bus event, see `dbus-check-event'. HANDLER, being
|
||
part of the event, is called with arguments ARGS.
|
||
If the HANDLER returns a `dbus-error', it is propagated as return message."
|
||
(interactive "e")
|
||
(condition-case err
|
||
(let (result)
|
||
;; We ignore not well-formed events.
|
||
(dbus-check-event event)
|
||
;; Error messages must be propagated.
|
||
(when (= dbus-message-type-error (nth 2 event))
|
||
(signal 'dbus-error (nthcdr 9 event)))
|
||
;; Apply the handler.
|
||
(setq result (apply (nth 8 event) (nthcdr 9 event)))
|
||
;; Return a message when it is a message call.
|
||
(when (= dbus-message-type-method-call (nth 2 event))
|
||
(dbus-ignore-errors
|
||
(if (eq result :ignore)
|
||
(dbus-method-return-internal
|
||
(nth 1 event) (nth 4 event) (nth 3 event))
|
||
(apply 'dbus-method-return-internal
|
||
(nth 1 event) (nth 4 event) (nth 3 event)
|
||
(if (consp result) result (list result)))))))
|
||
;; Error handling.
|
||
(dbus-error
|
||
;; Return an error message when it is a message call.
|
||
(when (= dbus-message-type-method-call (nth 2 event))
|
||
(dbus-ignore-errors
|
||
(dbus-method-error-internal
|
||
(nth 1 event) (nth 4 event) (nth 3 event) (cadr err))))
|
||
;; Propagate D-Bus error messages.
|
||
(run-hook-with-args 'dbus-event-error-functions event err)
|
||
(when dbus-debug
|
||
(signal (car err) (cdr err))))))
|
||
|
||
(defun dbus-event-bus-name (event)
|
||
"Return the bus name the event is coming from.
|
||
The result is either a Lisp symbol, `:system' or `:session', or a
|
||
string denoting the bus address. EVENT is a D-Bus event, see
|
||
`dbus-check-event'. This function raises a `dbus-error' signal
|
||
in case the event is not well formed."
|
||
(dbus-check-event event)
|
||
(nth 1 event))
|
||
|
||
(defun dbus-event-message-type (event)
|
||
"Return the message type of the corresponding D-Bus message.
|
||
The result is a number. EVENT is a D-Bus event, see
|
||
`dbus-check-event'. This function raises a `dbus-error' signal
|
||
in case the event is not well formed."
|
||
(dbus-check-event event)
|
||
(nth 2 event))
|
||
|
||
(defun dbus-event-serial-number (event)
|
||
"Return the serial number of the corresponding D-Bus message.
|
||
The result is a number. The serial number is needed for
|
||
generating a reply message. EVENT is a D-Bus event, see
|
||
`dbus-check-event'. This function raises a `dbus-error' signal
|
||
in case the event is not well formed."
|
||
(dbus-check-event event)
|
||
(nth 3 event))
|
||
|
||
(defun dbus-event-service-name (event)
|
||
"Return the name of the D-Bus object the event is coming from.
|
||
The result is a string. EVENT is a D-Bus event, see `dbus-check-event'.
|
||
This function raises a `dbus-error' signal in case the event is
|
||
not well formed."
|
||
(dbus-check-event event)
|
||
(nth 4 event))
|
||
|
||
(defun dbus-event-path-name (event)
|
||
"Return the object path of the D-Bus object the event is coming from.
|
||
The result is a string. EVENT is a D-Bus event, see `dbus-check-event'.
|
||
This function raises a `dbus-error' signal in case the event is
|
||
not well formed."
|
||
(dbus-check-event event)
|
||
(nth 5 event))
|
||
|
||
(defun dbus-event-interface-name (event)
|
||
"Return the interface name of the D-Bus object the event is coming from.
|
||
The result is a string. EVENT is a D-Bus event, see `dbus-check-event'.
|
||
This function raises a `dbus-error' signal in case the event is
|
||
not well formed."
|
||
(dbus-check-event event)
|
||
(nth 6 event))
|
||
|
||
(defun dbus-event-member-name (event)
|
||
"Return the member name the event is coming from.
|
||
It is either a signal name or a method name. The result is a
|
||
string. EVENT is a D-Bus event, see `dbus-check-event'. This
|
||
function raises a `dbus-error' signal in case the event is not
|
||
well formed."
|
||
(dbus-check-event event)
|
||
(nth 7 event))
|
||
|
||
|
||
;;; D-Bus registered names.
|
||
|
||
(defun dbus-list-activatable-names (&optional bus)
|
||
"Return the D-Bus service names which can be activated as list.
|
||
If BUS is left nil, `:system' is assumed. The result is a list
|
||
of strings, which is nil when there are no activatable service
|
||
names at all."
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
(or bus :system) dbus-service-dbus
|
||
dbus-path-dbus dbus-interface-dbus "ListActivatableNames")))
|
||
|
||
(defun dbus-list-names (bus)
|
||
"Return the service names registered at D-Bus BUS.
|
||
The result is a list of strings, which is nil when there are no
|
||
registered service names at all. Well known names are strings
|
||
like \"org.freedesktop.DBus\". Names starting with \":\" are
|
||
unique names for services."
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus "ListNames")))
|
||
|
||
(defun dbus-list-known-names (bus)
|
||
"Retrieve all services which correspond to a known name in BUS.
|
||
A service has a known name if it doesn't start with \":\"."
|
||
(let (result)
|
||
(dolist (name (dbus-list-names bus) (nreverse result))
|
||
(unless (string-equal ":" (substring name 0 1))
|
||
(push name result)))))
|
||
|
||
(defun dbus-list-queued-owners (bus service)
|
||
"Return the unique names registered at D-Bus BUS and queued for SERVICE.
|
||
The result is a list of strings, or nil when there are no
|
||
queued name owners service names at all."
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus
|
||
dbus-interface-dbus "ListQueuedOwners" service)))
|
||
|
||
(defun dbus-get-name-owner (bus service)
|
||
"Return the name owner of SERVICE registered at D-Bus BUS.
|
||
The result is either a string, or nil if there is no name owner."
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
bus dbus-service-dbus dbus-path-dbus
|
||
dbus-interface-dbus "GetNameOwner" service)))
|
||
|
||
(defun dbus-ping (bus service &optional timeout)
|
||
"Check whether SERVICE is registered for D-Bus BUS.
|
||
TIMEOUT, a nonnegative integer, specifies the maximum number of
|
||
milliseconds `dbus-ping' must return. The default value is 25,000.
|
||
|
||
Note, that this autoloads SERVICE if it is not running yet. If
|
||
it shall be checked whether SERVICE is already running, one shall
|
||
apply
|
||
|
||
(member service \(dbus-list-known-names bus))"
|
||
;; "Ping" raises a D-Bus error if SERVICE does not exist.
|
||
;; Otherwise, it returns silently with nil.
|
||
(condition-case nil
|
||
(not
|
||
(if (natnump timeout)
|
||
(dbus-call-method
|
||
bus service dbus-path-dbus dbus-interface-peer
|
||
"Ping" :timeout timeout)
|
||
(dbus-call-method
|
||
bus service dbus-path-dbus dbus-interface-peer "Ping")))
|
||
(dbus-error nil)))
|
||
|
||
(defun dbus-peer-handler ()
|
||
"Default handler for the \"org.freedesktop.DBus.Peer\" interface.
|
||
It will be registered for all objects created by `dbus-register-service'."
|
||
(let* ((last-input-event last-input-event)
|
||
(method (dbus-event-member-name last-input-event)))
|
||
(cond
|
||
;; "Ping" does not return an output parameter.
|
||
((string-equal method "Ping")
|
||
:ignore)
|
||
;; "GetMachineId" returns "s".
|
||
((string-equal method "GetMachineId")
|
||
(signal
|
||
'dbus-error
|
||
(list
|
||
(format "%s.GetMachineId not implemented" dbus-interface-peer)))))))
|
||
|
||
|
||
;;; D-Bus introspection.
|
||
|
||
(defun dbus-introspect (bus service path)
|
||
"Return all interfaces and sub-nodes of SERVICE,
|
||
registered at object path PATH at bus BUS.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address. SERVICE must be a known service name,
|
||
and PATH must be a valid object path. The last two parameters
|
||
are strings. The result, the introspection data, is a string in
|
||
XML format."
|
||
;; We don't want to raise errors.
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
bus service path dbus-interface-introspectable "Introspect"
|
||
:timeout 1000)))
|
||
|
||
(defun dbus-introspect-xml (bus service path)
|
||
"Return the introspection data of SERVICE in D-Bus BUS at object path PATH.
|
||
The data are a parsed list. The root object is a \"node\",
|
||
representing the object path PATH. The root object can contain
|
||
\"interface\" and further \"node\" objects."
|
||
;; We don't want to raise errors.
|
||
(xml-node-name
|
||
(ignore-errors
|
||
(with-temp-buffer
|
||
(insert (dbus-introspect bus service path))
|
||
(xml-parse-region (point-min) (point-max))))))
|
||
|
||
(defun dbus-introspect-get-attribute (object attribute)
|
||
"Return the ATTRIBUTE value of D-Bus introspection OBJECT.
|
||
ATTRIBUTE must be a string according to the attribute names in
|
||
the D-Bus specification."
|
||
(xml-get-attribute-or-nil object (intern attribute)))
|
||
|
||
(defun dbus-introspect-get-node-names (bus service path)
|
||
"Return all node names of SERVICE in D-Bus BUS at object path PATH.
|
||
It returns a list of strings. The node names stand for further
|
||
object paths of the D-Bus service."
|
||
(let ((object (dbus-introspect-xml bus service path))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'node) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-all-nodes (bus service path)
|
||
"Return all node names of SERVICE in D-Bus BUS at object path PATH.
|
||
It returns a list of strings, which are further object paths of SERVICE."
|
||
(let ((result (list path)))
|
||
(dolist (elt
|
||
(dbus-introspect-get-node-names bus service path)
|
||
result)
|
||
(setq elt (expand-file-name elt path))
|
||
(setq result
|
||
(append result (dbus-introspect-get-all-nodes bus service elt))))))
|
||
|
||
(defun dbus-introspect-get-interface-names (bus service path)
|
||
"Return all interface names of SERVICE in D-Bus BUS at object path PATH.
|
||
It returns a list of strings.
|
||
|
||
There will be always the default interface
|
||
\"org.freedesktop.DBus.Introspectable\". Another default
|
||
interface is \"org.freedesktop.DBus.Properties\". If present,
|
||
\"interface\" objects can also have \"property\" objects as
|
||
children, beside \"method\" and \"signal\" objects."
|
||
(let ((object (dbus-introspect-xml bus service path))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'interface) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-interface (bus service path interface)
|
||
"Return the INTERFACE of SERVICE in D-Bus BUS at object path PATH.
|
||
The return value is an XML object. INTERFACE must be a string,
|
||
element of the list returned by `dbus-introspect-get-interface-names'.
|
||
The resulting \"interface\" object can contain \"method\", \"signal\",
|
||
\"property\" and \"annotation\" children."
|
||
(let ((elt (xml-get-children
|
||
(dbus-introspect-xml bus service path) 'interface)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
interface
|
||
(dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-method-names (bus service path interface)
|
||
"Return a list of strings of all method names of INTERFACE.
|
||
SERVICE is a service of D-Bus BUS at object path PATH."
|
||
(let ((object (dbus-introspect-get-interface bus service path interface))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'method) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-method (bus service path interface method)
|
||
"Return method METHOD of interface INTERFACE as XML object.
|
||
It must be located at SERVICE in D-Bus BUS at object path PATH.
|
||
METHOD must be a string, element of the list returned by
|
||
`dbus-introspect-get-method-names'. The resulting \"method\"
|
||
object can contain \"arg\" and \"annotation\" children."
|
||
(let ((elt (xml-get-children
|
||
(dbus-introspect-get-interface bus service path interface)
|
||
'method)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
method (dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-signal-names (bus service path interface)
|
||
"Return a list of strings of all signal names of INTERFACE.
|
||
SERVICE is a service of D-Bus BUS at object path PATH."
|
||
(let ((object (dbus-introspect-get-interface bus service path interface))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'signal) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-signal (bus service path interface signal)
|
||
"Return signal SIGNAL of interface INTERFACE as XML object.
|
||
It must be located at SERVICE in D-Bus BUS at object path PATH.
|
||
SIGNAL must be a string, element of the list returned by
|
||
`dbus-introspect-get-signal-names'. The resulting \"signal\"
|
||
object can contain \"arg\" and \"annotation\" children."
|
||
(let ((elt (xml-get-children
|
||
(dbus-introspect-get-interface bus service path interface)
|
||
'signal)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
signal (dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-property-names (bus service path interface)
|
||
"Return a list of strings of all property names of INTERFACE.
|
||
SERVICE is a service of D-Bus BUS at object path PATH."
|
||
(let ((object (dbus-introspect-get-interface bus service path interface))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'property) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-property (bus service path interface property)
|
||
"This function returns PROPERTY of INTERFACE as XML object.
|
||
It must be located at SERVICE in D-Bus BUS at object path PATH.
|
||
PROPERTY must be a string, element of the list returned by
|
||
`dbus-introspect-get-property-names'. The resulting PROPERTY
|
||
object can contain \"annotation\" children."
|
||
(let ((elt (xml-get-children
|
||
(dbus-introspect-get-interface bus service path interface)
|
||
'property)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
property
|
||
(dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-annotation-names
|
||
(bus service path interface &optional name)
|
||
"Return all annotation names as list of strings.
|
||
If NAME is nil, the annotations are children of INTERFACE,
|
||
otherwise NAME must be a \"method\", \"signal\", or \"property\"
|
||
object, where the annotations belong to."
|
||
(let ((object
|
||
(if name
|
||
(or (dbus-introspect-get-method bus service path interface name)
|
||
(dbus-introspect-get-signal bus service path interface name)
|
||
(dbus-introspect-get-property bus service path interface name))
|
||
(dbus-introspect-get-interface bus service path interface)))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'annotation) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-annotation
|
||
(bus service path interface name annotation)
|
||
"Return ANNOTATION as XML object.
|
||
If NAME is nil, ANNOTATION is a child of INTERFACE, otherwise
|
||
NAME must be the name of a \"method\", \"signal\", or
|
||
\"property\" object, where the ANNOTATION belongs to."
|
||
(let ((elt (xml-get-children
|
||
(if name
|
||
(or (dbus-introspect-get-method
|
||
bus service path interface name)
|
||
(dbus-introspect-get-signal
|
||
bus service path interface name)
|
||
(dbus-introspect-get-property
|
||
bus service path interface name))
|
||
(dbus-introspect-get-interface bus service path interface))
|
||
'annotation)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
annotation
|
||
(dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-argument-names (bus service path interface name)
|
||
"Return a list of all argument names as list of strings.
|
||
NAME must be a \"method\" or \"signal\" object.
|
||
|
||
Argument names are optional, the function can return nil
|
||
therefore, even if the method or signal has arguments."
|
||
(let ((object
|
||
(or (dbus-introspect-get-method bus service path interface name)
|
||
(dbus-introspect-get-signal bus service path interface name)))
|
||
result)
|
||
(dolist (elt (xml-get-children object 'arg) (nreverse result))
|
||
(push (dbus-introspect-get-attribute elt "name") result))))
|
||
|
||
(defun dbus-introspect-get-argument (bus service path interface name arg)
|
||
"Return argument ARG as XML object.
|
||
NAME must be a \"method\" or \"signal\" object. ARG must be a string,
|
||
element of the list returned by `dbus-introspect-get-argument-names'."
|
||
(let ((elt (xml-get-children
|
||
(or (dbus-introspect-get-method bus service path interface name)
|
||
(dbus-introspect-get-signal bus service path interface name))
|
||
'arg)))
|
||
(while (and elt
|
||
(not (string-equal
|
||
arg (dbus-introspect-get-attribute (car elt) "name"))))
|
||
(setq elt (cdr elt)))
|
||
(car elt)))
|
||
|
||
(defun dbus-introspect-get-signature
|
||
(bus service path interface name &optional direction)
|
||
"Return signature of a `method' or `signal', represented by NAME, as string.
|
||
If NAME is a `method', DIRECTION can be either \"in\" or \"out\".
|
||
If DIRECTION is nil, \"in\" is assumed.
|
||
|
||
If NAME is a `signal', and DIRECTION is non-nil, DIRECTION must
|
||
be \"out\"."
|
||
;; For methods, we use "in" as default direction.
|
||
(let ((object (or (dbus-introspect-get-method
|
||
bus service path interface name)
|
||
(dbus-introspect-get-signal
|
||
bus service path interface name))))
|
||
(when (and (string-equal
|
||
"method" (dbus-introspect-get-attribute object "name"))
|
||
(not (stringp direction)))
|
||
(setq direction "in"))
|
||
;; In signals, no direction is given.
|
||
(when (string-equal "signal" (dbus-introspect-get-attribute object "name"))
|
||
(setq direction nil))
|
||
;; Collect the signatures.
|
||
(mapconcat
|
||
(lambda (x)
|
||
(let ((arg (dbus-introspect-get-argument
|
||
bus service path interface name x)))
|
||
(if (or (not (stringp direction))
|
||
(string-equal
|
||
direction
|
||
(dbus-introspect-get-attribute arg "direction")))
|
||
(dbus-introspect-get-attribute arg "type")
|
||
"")))
|
||
(dbus-introspect-get-argument-names bus service path interface name)
|
||
"")))
|
||
|
||
|
||
;;; D-Bus properties.
|
||
|
||
(defun dbus-get-property (bus service path interface property)
|
||
"Return the value of PROPERTY of INTERFACE.
|
||
It will be checked at BUS, SERVICE, PATH. The result can be any
|
||
valid D-Bus value, or nil if there is no PROPERTY."
|
||
(dbus-ignore-errors
|
||
;; "Get" returns a variant, so we must use the `car'.
|
||
(car
|
||
(dbus-call-method
|
||
bus service path dbus-interface-properties
|
||
"Get" :timeout 500 interface property))))
|
||
|
||
(defun dbus-set-property (bus service path interface property value)
|
||
"Set value of PROPERTY of INTERFACE to VALUE.
|
||
It will be checked at BUS, SERVICE, PATH. When the value has
|
||
been set successful, the result is VALUE. Otherwise, nil is
|
||
returned."
|
||
(dbus-ignore-errors
|
||
;; "Set" requires a variant.
|
||
(dbus-call-method
|
||
bus service path dbus-interface-properties
|
||
"Set" :timeout 500 interface property (list :variant value))
|
||
;; Return VALUE.
|
||
(dbus-get-property bus service path interface property)))
|
||
|
||
(defun dbus-get-all-properties (bus service path interface)
|
||
"Return all properties of INTERFACE at BUS, SERVICE, PATH.
|
||
The result is a list of entries. Every entry is a cons of the
|
||
name of the property, and its value. If there are no properties,
|
||
nil is returned."
|
||
(dbus-ignore-errors
|
||
;; "GetAll" returns "a{sv}".
|
||
(let (result)
|
||
(dolist (dict
|
||
(dbus-call-method
|
||
bus service path dbus-interface-properties
|
||
"GetAll" :timeout 500 interface)
|
||
(nreverse result))
|
||
(push (cons (car dict) (cl-caadr dict)) result)))))
|
||
|
||
(defun dbus-register-property
|
||
(bus service path interface property access value
|
||
&optional emits-signal dont-register-service)
|
||
"Register property PROPERTY on the D-Bus BUS.
|
||
|
||
BUS is either a Lisp symbol, `:system' or `:session', or a string
|
||
denoting the bus address.
|
||
|
||
SERVICE is the D-Bus service name of the D-Bus. It must be a
|
||
known name (See discussion of DONT-REGISTER-SERVICE below).
|
||
|
||
PATH is the D-Bus object path SERVICE is registered (See
|
||
discussion of DONT-REGISTER-SERVICE below). INTERFACE is the
|
||
name of the interface used at PATH, PROPERTY is the name of the
|
||
property of INTERFACE. ACCESS indicates, whether the property
|
||
can be changed by other services via D-Bus. It must be either
|
||
the symbol `:read' or `:readwrite'. VALUE is the initial value
|
||
of the property, it can be of any valid type (see
|
||
`dbus-call-method' for details).
|
||
|
||
If PROPERTY already exists on PATH, it will be overwritten. For
|
||
properties with access type `:read' this is the only way to
|
||
change their values. Properties with access type `:readwrite'
|
||
can be changed by `dbus-set-property'.
|
||
|
||
The interface \"org.freedesktop.DBus.Properties\" is added to
|
||
PATH, including a default handler for the \"Get\", \"GetAll\" and
|
||
\"Set\" methods of this interface. When EMITS-SIGNAL is non-nil,
|
||
the signal \"PropertiesChanged\" is sent when the property is
|
||
changed by `dbus-set-property'.
|
||
|
||
When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is
|
||
not registered. This means that other D-Bus clients have no way
|
||
of noticing the newly registered property. When interfaces are
|
||
constructed incrementally by adding single methods or properties
|
||
at a time, DONT-REGISTER-SERVICE can be used to prevent other
|
||
clients from discovering the still incomplete interface."
|
||
(unless (member access '(:read :readwrite))
|
||
(signal 'wrong-type-argument (list "Access type invalid" access)))
|
||
|
||
;; Add handlers for the three property-related methods.
|
||
(dbus-register-method
|
||
bus service path dbus-interface-properties "Get"
|
||
'dbus-property-handler 'dont-register)
|
||
(dbus-register-method
|
||
bus service path dbus-interface-properties "GetAll"
|
||
'dbus-property-handler 'dont-register)
|
||
(dbus-register-method
|
||
bus service path dbus-interface-properties "Set"
|
||
'dbus-property-handler 'dont-register)
|
||
|
||
;; Register SERVICE.
|
||
(unless (or dont-register-service (member service (dbus-list-names bus)))
|
||
(dbus-register-service bus service))
|
||
|
||
;; Send the PropertiesChanged signal.
|
||
(when emits-signal
|
||
(dbus-send-signal
|
||
bus service path dbus-interface-properties "PropertiesChanged"
|
||
`((:dict-entry ,property (:variant ,value)))
|
||
'(:array)))
|
||
|
||
;; Create a hash table entry. We use nil for the unique name,
|
||
;; because the property might be accessed from anybody.
|
||
(let ((key (list :property bus interface property))
|
||
(val
|
||
(list
|
||
(list
|
||
nil service path
|
||
(cons
|
||
(if emits-signal (list access :emits-signal) (list access))
|
||
value)))))
|
||
(puthash key val dbus-registered-objects-table)
|
||
|
||
;; Return the object.
|
||
(list key (list service path))))
|
||
|
||
(defun dbus-property-handler (&rest args)
|
||
"Default handler for the \"org.freedesktop.DBus.Properties\" interface.
|
||
It will be registered for all objects created by `dbus-register-property'."
|
||
(let ((bus (dbus-event-bus-name last-input-event))
|
||
(service (dbus-event-service-name last-input-event))
|
||
(path (dbus-event-path-name last-input-event))
|
||
(method (dbus-event-member-name last-input-event))
|
||
(interface (car args))
|
||
(property (cadr args)))
|
||
(cond
|
||
;; "Get" returns a variant.
|
||
((string-equal method "Get")
|
||
(let ((entry (gethash (list :property bus interface property)
|
||
dbus-registered-objects-table)))
|
||
(when (string-equal path (nth 2 (car entry)))
|
||
`((:variant ,(cdar (last (car entry))))))))
|
||
|
||
;; "Set" expects a variant.
|
||
((string-equal method "Set")
|
||
(let* ((value (caar (cddr args)))
|
||
(entry (gethash (list :property bus interface property)
|
||
dbus-registered-objects-table))
|
||
;; The value of the hash table is a list; in case of
|
||
;; properties it contains just one element (UNAME SERVICE
|
||
;; PATH OBJECT). OBJECT is a cons cell of a list, which
|
||
;; contains a list of annotations (like :read,
|
||
;; :read-write, :emits-signal), and the value of the
|
||
;; property.
|
||
(object (car (last (car entry)))))
|
||
(unless (consp object)
|
||
(signal 'dbus-error
|
||
(list "Property not registered at path" property path)))
|
||
(unless (member :readwrite (car object))
|
||
(signal 'dbus-error
|
||
(list "Property not writable at path" property path)))
|
||
(puthash (list :property bus interface property)
|
||
(list (append (butlast (car entry))
|
||
(list (cons (car object) value))))
|
||
dbus-registered-objects-table)
|
||
;; Send the "PropertiesChanged" signal.
|
||
(when (member :emits-signal (car object))
|
||
(dbus-send-signal
|
||
bus service path dbus-interface-properties "PropertiesChanged"
|
||
`((:dict-entry ,property (:variant ,value)))
|
||
'(:array)))
|
||
;; Return empty reply.
|
||
:ignore))
|
||
|
||
;; "GetAll" returns "a{sv}".
|
||
((string-equal method "GetAll")
|
||
(let (result)
|
||
(maphash
|
||
(lambda (key val)
|
||
(when (and (equal (butlast key) (list :property bus interface))
|
||
(string-equal path (nth 2 (car val)))
|
||
(not (functionp (car (last (car val))))))
|
||
(push
|
||
(list :dict-entry
|
||
(car (last key))
|
||
(list :variant (cdar (last (car val)))))
|
||
result)))
|
||
dbus-registered-objects-table)
|
||
;; Return the result, or an empty array.
|
||
(list :array (or result '(:signature "{sv}"))))))))
|
||
|
||
|
||
;;; D-Bus object manager.
|
||
|
||
(defun dbus-get-all-managed-objects (bus service path)
|
||
"Return all objects at BUS, SERVICE, PATH, and the children of PATH.
|
||
The result is a list of objects. Every object is a cons of an
|
||
existing path name, and the list of available interface objects.
|
||
An interface object is another cons, which car is the interface
|
||
name, and the cdr is the list of properties as returned by
|
||
`dbus-get-all-properties' for that path and interface. Example:
|
||
|
||
\(dbus-get-all-managed-objects :session \"org.gnome.SettingsDaemon\" \"/\")
|
||
|
||
=> ((\"/org/gnome/SettingsDaemon/MediaKeys\"
|
||
(\"org.gnome.SettingsDaemon.MediaKeys\")
|
||
(\"org.freedesktop.DBus.Peer\")
|
||
(\"org.freedesktop.DBus.Introspectable\")
|
||
(\"org.freedesktop.DBus.Properties\")
|
||
(\"org.freedesktop.DBus.ObjectManager\"))
|
||
(\"/org/gnome/SettingsDaemon/Power\"
|
||
(\"org.gnome.SettingsDaemon.Power.Keyboard\")
|
||
(\"org.gnome.SettingsDaemon.Power.Screen\")
|
||
(\"org.gnome.SettingsDaemon.Power\"
|
||
(\"Icon\" . \". GThemedIcon battery-full-charged-symbolic \")
|
||
(\"Tooltip\" . \"Laptop battery is charged\"))
|
||
(\"org.freedesktop.DBus.Peer\")
|
||
(\"org.freedesktop.DBus.Introspectable\")
|
||
(\"org.freedesktop.DBus.Properties\")
|
||
(\"org.freedesktop.DBus.ObjectManager\"))
|
||
...)
|
||
|
||
If possible, \"org.freedesktop.DBus.ObjectManager.GetManagedObjects\"
|
||
is used for retrieving the information. Otherwise, the information
|
||
is collected via \"org.freedesktop.DBus.Introspectable.Introspect\"
|
||
and \"org.freedesktop.DBus.Properties.GetAll\", which is slow."
|
||
(let ((result
|
||
;; Direct call. Fails, if the target does not support the
|
||
;; object manager interface.
|
||
(dbus-ignore-errors
|
||
(dbus-call-method
|
||
bus service path dbus-interface-objectmanager
|
||
"GetManagedObjects" :timeout 1000))))
|
||
|
||
(if result
|
||
;; Massage the returned structure.
|
||
(dolist (entry result result)
|
||
;; "a{oa{sa{sv}}}".
|
||
(dolist (entry1 (cdr entry))
|
||
;; "a{sa{sv}}".
|
||
(dolist (entry2 entry1)
|
||
;; "a{sv}".
|
||
(if (cadr entry2)
|
||
;; "sv".
|
||
(dolist (entry3 (cadr entry2))
|
||
(setcdr entry3 (cl-caadr entry3)))
|
||
(setcdr entry2 nil)))))
|
||
|
||
;; Fallback: collect the information. Slooow!
|
||
(dolist (object
|
||
(dbus-introspect-get-all-nodes bus service path)
|
||
result)
|
||
(let (result1)
|
||
(dolist
|
||
(interface
|
||
(dbus-introspect-get-interface-names bus service object)
|
||
result1)
|
||
(push
|
||
(cons interface
|
||
(dbus-get-all-properties bus service object interface))
|
||
result1))
|
||
(when result1
|
||
(push (cons object result1) result)))))))
|
||
|
||
(defun dbus-managed-objects-handler ()
|
||
"Default handler for the \"org.freedesktop.DBus.ObjectManager\" interface.
|
||
It will be registered for all objects created by `dbus-register-service'."
|
||
(let* ((last-input-event last-input-event)
|
||
(bus (dbus-event-bus-name last-input-event))
|
||
(path (dbus-event-path-name last-input-event)))
|
||
;; "GetManagedObjects" returns "a{oa{sa{sv}}}".
|
||
(let (interfaces result)
|
||
|
||
;; Check for object path wildcard interfaces.
|
||
(maphash
|
||
(lambda (key val)
|
||
(when (and (equal (butlast key 2) (list :method bus))
|
||
(null (nth 2 (car-safe val))))
|
||
(push (nth 2 key) interfaces)))
|
||
dbus-registered-objects-table)
|
||
|
||
;; Check all registered object paths.
|
||
(maphash
|
||
(lambda (key val)
|
||
(let ((object (or (nth 2 (car-safe val)) "")))
|
||
(when (and (equal (butlast key 2) (list :method bus))
|
||
(string-prefix-p path object))
|
||
(dolist (interface (cons (nth 2 key) interfaces))
|
||
(unless (assoc object result)
|
||
(push (list object) result))
|
||
(unless (assoc interface (cdr (assoc object result)))
|
||
(setcdr
|
||
(assoc object result)
|
||
(append
|
||
(list (cons
|
||
interface
|
||
;; We simulate "org.freedesktop.DBus.Properties.GetAll"
|
||
;; by using an appropriate D-Bus event.
|
||
(let ((last-input-event
|
||
(append
|
||
(butlast last-input-event 4)
|
||
(list object dbus-interface-properties
|
||
"GetAll" 'dbus-property-handler))))
|
||
(dbus-property-handler interface))))
|
||
(cdr (assoc object result)))))))))
|
||
dbus-registered-objects-table)
|
||
|
||
;; Return the result, or an empty array.
|
||
(list
|
||
:array
|
||
(or
|
||
(mapcar
|
||
(lambda (x)
|
||
(list
|
||
:dict-entry :object-path (car x)
|
||
(cons :array (mapcar (lambda (y) (cons :dict-entry y)) (cdr x)))))
|
||
result)
|
||
'(:signature "{oa{sa{sv}}}"))))))
|
||
|
||
(defun dbus-handle-bus-disconnect ()
|
||
"React to a bus disconnection.
|
||
BUS is the bus that disconnected. This routine unregisters all
|
||
handlers on the given bus and causes all synchronous calls
|
||
pending at the time of disconnect to fail."
|
||
(let ((bus (dbus-event-bus-name last-input-event))
|
||
(keys-to-remove))
|
||
(maphash
|
||
(lambda (key value)
|
||
(when (and (eq (nth 0 key) :serial)
|
||
(eq (nth 1 key) bus))
|
||
(run-hook-with-args
|
||
'dbus-event-error-functions
|
||
(list 'dbus-event
|
||
bus
|
||
dbus-message-type-error
|
||
(nth 2 key)
|
||
nil
|
||
nil
|
||
nil
|
||
nil
|
||
value)
|
||
(list 'dbus-error "Bus disconnected" bus))
|
||
(push key keys-to-remove)))
|
||
dbus-registered-objects-table)
|
||
(dolist (key keys-to-remove)
|
||
(remhash key dbus-registered-objects-table))))
|
||
|
||
(defun dbus-init-bus (bus &optional private)
|
||
"Establish the connection to D-Bus BUS.
|
||
|
||
BUS can be either the symbol `:system' or the symbol `:session', or it
|
||
can be a string denoting the address of the corresponding bus. For
|
||
the system and session buses, this function is called when loading
|
||
`dbus.el', there is no need to call it again.
|
||
|
||
The function returns a number, which counts the connections this Emacs
|
||
session has established to the BUS under the same unique name (see
|
||
`dbus-get-unique-name'). It depends on the libraries Emacs is linked
|
||
with, and on the environment Emacs is running. For example, if Emacs
|
||
is linked with the gtk toolkit, and it runs in a GTK-aware environment
|
||
like Gnome, another connection might already be established.
|
||
|
||
When PRIVATE is non-nil, a new connection is established instead of
|
||
reusing an existing one. It results in a new unique name at the bus.
|
||
This can be used, if it is necessary to distinguish from another
|
||
connection used in the same Emacs process, like the one established by
|
||
GTK+. It should be used with care for at least the `:system' and
|
||
`:session' buses, because other Emacs Lisp packages might already use
|
||
this connection to those buses."
|
||
(or (featurep 'dbusbind)
|
||
(signal 'dbus-error (list "Emacs not compiled with dbus support")))
|
||
(dbus--init-bus bus private)
|
||
(dbus-register-signal
|
||
bus nil dbus-path-local dbus-interface-local
|
||
"Disconnected" #'dbus-handle-bus-disconnect))
|
||
|
||
|
||
;; Initialize `:system' and `:session' buses. This adds their file
|
||
;; descriptors to input_wait_mask, in order to detect incoming
|
||
;; messages immediately.
|
||
(when (featurep 'dbusbind)
|
||
(dbus-ignore-errors
|
||
(dbus-init-bus :system))
|
||
(dbus-ignore-errors
|
||
(dbus-init-bus :session)))
|
||
|
||
(provide 'dbus)
|
||
|
||
;;; TODO:
|
||
|
||
;; * Implement org.freedesktop.DBus.ObjectManager.InterfacesAdded and
|
||
;; org.freedesktop.DBus.ObjectManager.InterfacesRemoved.
|
||
|
||
;;; dbus.el ends here
|