class Gio::DebugControllerDBus


#GDebugControllerDBus is an implementation of #GDebugController which exposes debug settings as a D-Bus object.

It is a #GInitable object, and will register an object at /org/gtk/Debugging on the bus given as #GDebugControllerDBus:connection once it’s initialized. The object will be unregistered when the last reference to the #GDebugControllerDBus is dropped.

This D-Bus object can be used by remote processes to enable or disable debug output in this process. Remote processes calling org.gtk.Debugging.SetDebugEnabled() will affect the value of #GDebugController:debug-enabled and, by default, g_log_get_debug_enabled(). default.

By default, all processes will be able to call SetDebugEnabled(). If this process is privileged, or might expose sensitive information in its debug output, you may want to restrict the ability to enable debug output to privileged users or processes.

One option is to install a D-Bus security policy which restricts access to SetDebugEnabled(), installing something like the following in $datadir/dbus-1/system.d/: |[


This will prevent the SetDebugEnabled() method from being called by all except root. It will not prevent the DebugEnabled property from being read, as it’s accessed through the org.freedesktop.DBus.Properties interface.

Another option is to use polkit to allow or deny requests on a case-by-case basis, allowing for the possibility of dynamic authorisation. To do this, connect to the #GDebugControllerDBus::authorize signal and query polkit in it: |[ g_autoptr(GError) child_error = NULL; g_autoptr(GDBusConnection) connection = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, NULL); gulong debug_controller_authorize_id = 0;

// Set up the debug controller. debug_controller = G_DEBUG_CONTROLLER (g_debug_controller_dbus_new (priv->connection, NULL, &child_error)); if (debug_controller == NULL) { g_error ("Could not register debug controller on bus: %s"), child_error->message); }

debug_controller_authorize_id = g_signal_connect (debug_controller, "authorize", G_CALLBACK (debug_controller_authorize_cb), self);

static gboolean debug_controller_authorize_cb (GDebugControllerDBus *debug_controller, GDBusMethodInvocation *invocation, gpointer user_data) { g_autoptr(PolkitAuthority) authority = NULL; g_autoptr(PolkitSubject) subject = NULL; g_autoptr(PolkitAuthorizationResult) auth_result = NULL; g_autoptr(GError) local_error = NULL; GDBusMessage *message; GDBusMessageFlags message_flags; PolkitCheckAuthorizationFlags flags = POLKIT_CHECK_AUTHORIZATION_FLAGS_NONE;

message = g_dbus_method_invocation_get_message (invocation);
message_flags = g_dbus_message_get_flags (message);

authority = polkit_authority_get_sync (NULL, &local_error);
if (authority == NULL)
    g_warning ("Failed to get polkit authority: %s", local_error->message);
    return FALSE;


subject = polkit_system_bus_name_new (g_dbus_method_invocation_get_sender (invocation));

auth_result = polkit_authority_check_authorization_sync (authority,
if (auth_result == NULL)
    g_warning ("Failed to get check polkit authorization: %s", local_error->message);
    return FALSE;

return polkit_authorization_result_get_is_authorized (auth_result);

} ]|

Included Modules

Defined in:



Class Method Summary

Instance Method Summary

Instance methods inherited from module Gio::Initable

init(cancellable : Gio::Cancellable?) : Bool init, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter), cancellable : Gio::Cancellable?) : GObject::Object newv, to_unsafe to_unsafe

Class methods inherited from module Gio::Initable

g_type : UInt64 g_type

Instance methods inherited from module Gio::DebugController

debug_enabled : Bool debug_enabled, debug_enabled=(debug_enabled : Bool) : Nil debug_enabled=, debug_enabled? : Bool debug_enabled?, to_unsafe to_unsafe

Class methods inherited from module Gio::DebugController

g_type : UInt64 g_type

Instance methods inherited from class GObject::Object

bind_property(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags) : GObject::Binding bind_property, bind_property_full(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags, transform_to : GObject::Closure, transform_from : GObject::Closure) : GObject::Binding bind_property_full, data(key : String) : Pointer(Void)? data, finalize finalize, freeze_notify : Nil freeze_notify, getv(names : Enumerable(String), values : Enumerable(_)) : Nil getv, notify(property_name : String) : Nil notify, notify_by_pspec(pspec : GObject::ParamSpec) : Nil notify_by_pspec, notify_signal notify_signal, property(property_name : String, value : _) : Nil property, qdata(quark : UInt32) : Pointer(Void)? qdata, ref_count : UInt32 ref_count, run_dispose : Nil run_dispose, set_data(key : String, data : Pointer(Void)?) : Nil set_data, set_property(property_name : String, value : _) : Nil set_property, steal_data(key : String) : Pointer(Void)? steal_data, steal_qdata(quark : UInt32) : Pointer(Void)? steal_qdata, thaw_notify : Nil thaw_notify, to_unsafe : Pointer(Void) to_unsafe, watch_closure(closure : GObject::Closure) : Nil watch_closure

Constructor methods inherited from class GObject::Object

cast(obj : GObject::Object) : self cast, cast?(obj : GObject::Object) : self? cast?, new(pointer : Pointer(Void), transfer : GICrystal::Transfer)
, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter)) : self newv

Class methods inherited from class GObject::Object

compat_control(what : UInt64, data : Pointer(Void)?) : UInt64 compat_control, g_type : UInt64 g_type, interface_find_property(g_iface : GObject::TypeInterface, property_name : String) : GObject::ParamSpec interface_find_property, interface_list_properties(g_iface : GObject::TypeInterface) : Enumerable(GObject::ParamSpec) interface_list_properties

Constructor Detail

def : Gio::DBusConnection, cancellable : Gio::Cancellable?) : self? #

Create a new #GDebugControllerDBus and synchronously initialize it.

Initializing the object will export the debug object on @connection. The object will remain registered until the last reference to the #GDebugControllerDBus is dropped.

Initialization may fail if registering the object on @connection fails.

def #

Initialize a new DebugControllerDBus.

def*, connection : Gio::DBusConnection? = nil, debug_enabled : Bool? = nil) #

Class Method Detail

def self.g_type : UInt64 #

Returns the type id (GType) registered in GLib type system.

Instance Method Detail

def authorize_signal #

def connection : Gio::DBusConnection? #

def connection=(value : Gio::DBusConnection?) : Gio::DBusConnection? #

def stop : Nil #

Stop the debug controller, unregistering its object from the bus.

Any pending method calls to the object will complete successfully, but new ones will return an error. This method will block until all pending #GDebugControllerDBus::authorize signals have been handled. This is expected to not take long, as it will just be waiting for threads to join. If any #GDebugControllerDBus::authorize signal handlers are still executing in other threads, this will block until after they have returned.

This method will be called automatically when the final reference to the #GDebugControllerDBus is dropped. You may want to call it explicitly to know when the controller has been fully removed from the bus, or to break reference count cycles.

Calling this method from within a #GDebugControllerDBus::authorize signal handler will cause a deadlock and must not be done.