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glib/gio/gdbusinterfaceskeleton.c
Christian Hergert 22ba4411cc gio: remove use of generic marshaller from GIO objects 
Using the generic marshaller has drawbacks beyond performance. One such
drawback is that it breaks the stack unwinding from the Linux kernel due
to having unsufficient data to walk past ffi_call_unixt64. That means that
performance profiling by application developers looks grouped among
seemingly unrelated code paths.

While we can't fix the kernel unwinding here, we can provide proper
c_marshallers and va_marshallers for objects within Gio so that
performance profiling of applications is more reliable.

Related to GNOME/Initiatives#10
2019-06-17 16:29:09 -07:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include "gdbusinterface.h"
#include "gdbusinterfaceskeleton.h"
#include "gdbusobjectskeleton.h"
#include "gioenumtypes.h"
#include "gdbusprivate.h"
#include "gdbusmethodinvocation.h"
#include "gdbusconnection.h"
#include "gmarshal-internal.h"
#include "gtask.h"
#include "gioerror.h"
#include "glibintl.h"
/**
* SECTION:gdbusinterfaceskeleton
* @short_description: Service-side D-Bus interface
* @include: gio/gio.h
*
* Abstract base class for D-Bus interfaces on the service side.
*/
struct _GDBusInterfaceSkeletonPrivate
{
GMutex lock;
GDBusObject *object;
GDBusInterfaceSkeletonFlags flags;
GSList *connections; /* List of ConnectionData */
gchar *object_path; /* The object path for this skeleton */
GDBusInterfaceVTable *hooked_vtable;
};
typedef struct
{
GDBusConnection *connection;
guint registration_id;
} ConnectionData;
enum
{
G_AUTHORIZE_METHOD_SIGNAL,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_G_FLAGS
};
static guint signals[LAST_SIGNAL] = {0};
static void dbus_interface_interface_init (GDBusInterfaceIface *iface);
static void set_object_path_locked (GDBusInterfaceSkeleton *interface_,
const gchar *object_path);
static void remove_connection_locked (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection);
static void skeleton_intercept_handle_method_call (GDBusConnection *connection,
const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
GDBusMethodInvocation *invocation,
gpointer user_data);
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GDBusInterfaceSkeleton, g_dbus_interface_skeleton, G_TYPE_OBJECT,
G_ADD_PRIVATE (GDBusInterfaceSkeleton)
G_IMPLEMENT_INTERFACE (G_TYPE_DBUS_INTERFACE, dbus_interface_interface_init))
static void
g_dbus_interface_skeleton_finalize (GObject *object)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
/* Hold the lock just in case any code we call verifies that the lock is held */
g_mutex_lock (&interface->priv->lock);
/* unexport from all connections if we're exported anywhere */
while (interface->priv->connections != NULL)
{
ConnectionData *data = interface->priv->connections->data;
remove_connection_locked (interface, data->connection);
}
set_object_path_locked (interface, NULL);
g_mutex_unlock (&interface->priv->lock);
g_free (interface->priv->hooked_vtable);
if (interface->priv->object != NULL)
g_object_remove_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
g_mutex_clear (&interface->priv->lock);
G_OBJECT_CLASS (g_dbus_interface_skeleton_parent_class)->finalize (object);
}
static void
g_dbus_interface_skeleton_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
switch (prop_id)
{
case PROP_G_FLAGS:
g_value_set_flags (value, g_dbus_interface_skeleton_get_flags (interface));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_interface_skeleton_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
switch (prop_id)
{
case PROP_G_FLAGS:
g_dbus_interface_skeleton_set_flags (interface, g_value_get_flags (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
g_dbus_interface_skeleton_g_authorize_method_default (GDBusInterfaceSkeleton *interface,
GDBusMethodInvocation *invocation)
{
return TRUE;
}
static void
g_dbus_interface_skeleton_class_init (GDBusInterfaceSkeletonClass *klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_interface_skeleton_finalize;
gobject_class->set_property = g_dbus_interface_skeleton_set_property;
gobject_class->get_property = g_dbus_interface_skeleton_get_property;
klass->g_authorize_method = g_dbus_interface_skeleton_g_authorize_method_default;
/**
* GDBusInterfaceSkeleton:g-flags:
*
* Flags from the #GDBusInterfaceSkeletonFlags enumeration.
*
* Since: 2.30
*/
g_object_class_install_property (gobject_class,
PROP_G_FLAGS,
g_param_spec_flags ("g-flags",
"g-flags",
"Flags for the interface skeleton",
G_TYPE_DBUS_INTERFACE_SKELETON_FLAGS,
G_DBUS_INTERFACE_SKELETON_FLAGS_NONE,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_STATIC_STRINGS));
/**
* GDBusInterfaceSkeleton::g-authorize-method:
* @interface: The #GDBusInterfaceSkeleton emitting the signal.
* @invocation: A #GDBusMethodInvocation.
*
* Emitted when a method is invoked by a remote caller and used to
* determine if the method call is authorized.
*
* Note that this signal is emitted in a thread dedicated to
* handling the method call so handlers are allowed to perform
* blocking IO. This means that it is appropriate to call e.g.
* [polkit_authority_check_authorization_sync()](http://hal.freedesktop.org/docs/polkit/PolkitAuthority.html#polkit-authority-check-authorization-sync)
* with the
* [POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION](http://hal.freedesktop.org/docs/polkit/PolkitAuthority.html#POLKIT-CHECK-AUTHORIZATION-FLAGS-ALLOW-USER-INTERACTION:CAPS)
* flag set.
*
* If %FALSE is returned then no further handlers are run and the
* signal handler must take a reference to @invocation and finish
* handling the call (e.g. return an error via
* g_dbus_method_invocation_return_error()).
*
* Otherwise, if %TRUE is returned, signal emission continues. If no
* handlers return %FALSE, then the method is dispatched. If
* @interface has an enclosing #GDBusObjectSkeleton, then the
* #GDBusObjectSkeleton::authorize-method signal handlers run before
* the handlers for this signal.
*
* The default class handler just returns %TRUE.
*
* Please note that the common case is optimized: if no signals
* handlers are connected and the default class handler isn't
* overridden (for both @interface and the enclosing
* #GDBusObjectSkeleton, if any) and #GDBusInterfaceSkeleton:g-flags does
* not have the
* %G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD
* flags set, no dedicated thread is ever used and the call will be
* handled in the same thread as the object that @interface belongs
* to was exported in.
*
* Returns: %TRUE if the call is authorized, %FALSE otherwise.
*
* Since: 2.30
*/
signals[G_AUTHORIZE_METHOD_SIGNAL] =
g_signal_new (I_("g-authorize-method"),
G_TYPE_DBUS_INTERFACE_SKELETON,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDBusInterfaceSkeletonClass, g_authorize_method),
_g_signal_accumulator_false_handled,
NULL,
_g_cclosure_marshal_BOOLEAN__OBJECT,
G_TYPE_BOOLEAN,
1,
G_TYPE_DBUS_METHOD_INVOCATION);
g_signal_set_va_marshaller (signals[G_AUTHORIZE_METHOD_SIGNAL],
G_TYPE_FROM_CLASS (klass),
_g_cclosure_marshal_BOOLEAN__OBJECTv);
}
static void
g_dbus_interface_skeleton_init (GDBusInterfaceSkeleton *interface)
{
interface->priv = g_dbus_interface_skeleton_get_instance_private (interface);
g_mutex_init (&interface->priv->lock);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_interface_skeleton_get_flags:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets the #GDBusInterfaceSkeletonFlags that describes what the behavior
* of @interface_
*
* Returns: One or more flags from the #GDBusInterfaceSkeletonFlags enumeration.
*
* Since: 2.30
*/
GDBusInterfaceSkeletonFlags
g_dbus_interface_skeleton_get_flags (GDBusInterfaceSkeleton *interface_)
{
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), G_DBUS_INTERFACE_SKELETON_FLAGS_NONE);
return interface_->priv->flags;
}
/**
* g_dbus_interface_skeleton_set_flags:
* @interface_: A #GDBusInterfaceSkeleton.
* @flags: Flags from the #GDBusInterfaceSkeletonFlags enumeration.
*
* Sets flags describing what the behavior of @skeleton should be.
*
* Since: 2.30
*/
void
g_dbus_interface_skeleton_set_flags (GDBusInterfaceSkeleton *interface_,
GDBusInterfaceSkeletonFlags flags)
{
g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
g_mutex_lock (&interface_->priv->lock);
if (interface_->priv->flags != flags)
{
interface_->priv->flags = flags;
g_mutex_unlock (&interface_->priv->lock);
g_object_notify (G_OBJECT (interface_), "g-flags");
}
else
{
g_mutex_unlock (&interface_->priv->lock);
}
}
/**
* g_dbus_interface_skeleton_get_info:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets D-Bus introspection information for the D-Bus interface
* implemented by @interface_.
*
* Returns: (transfer none): A #GDBusInterfaceInfo (never %NULL). Do not free.
*
* Since: 2.30
*/
GDBusInterfaceInfo *
g_dbus_interface_skeleton_get_info (GDBusInterfaceSkeleton *interface_)
{
GDBusInterfaceInfo *ret;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_info (interface_);
g_warn_if_fail (ret != NULL);
return ret;
}
/**
* g_dbus_interface_skeleton_get_vtable: (skip)
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets the interface vtable for the D-Bus interface implemented by
* @interface_. The returned function pointers should expect @interface_
* itself to be passed as @user_data.
*
* Returns: A #GDBusInterfaceVTable (never %NULL).
*
* Since: 2.30
*/
GDBusInterfaceVTable *
g_dbus_interface_skeleton_get_vtable (GDBusInterfaceSkeleton *interface_)
{
GDBusInterfaceVTable *ret;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_vtable (interface_);
g_warn_if_fail (ret != NULL);
return ret;
}
/**
* g_dbus_interface_skeleton_get_properties:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets all D-Bus properties for @interface_.
*
* Returns: (transfer full): A #GVariant of type
* ['a{sv}'][G-VARIANT-TYPE-VARDICT:CAPS].
* Free with g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_interface_skeleton_get_properties (GDBusInterfaceSkeleton *interface_)
{
GVariant *ret;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_properties (interface_);
return g_variant_take_ref (ret);
}
/**
* g_dbus_interface_skeleton_flush:
* @interface_: A #GDBusInterfaceSkeleton.
*
* If @interface_ has outstanding changes, request for these changes to be
* emitted immediately.
*
* For example, an exported D-Bus interface may queue up property
* changes and emit the
* `org.freedesktop.DBus.Properties.PropertiesChanged`
* signal later (e.g. in an idle handler). This technique is useful
* for collapsing multiple property changes into one.
*
* Since: 2.30
*/
void
g_dbus_interface_skeleton_flush (GDBusInterfaceSkeleton *interface_)
{
g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->flush (interface_);
}
/* ---------------------------------------------------------------------------------------------------- */
static GDBusInterfaceInfo *
_g_dbus_interface_skeleton_get_info (GDBusInterface *interface_)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
return g_dbus_interface_skeleton_get_info (interface);
}
static GDBusObject *
g_dbus_interface_skeleton_get_object (GDBusInterface *interface_)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
GDBusObject *ret;
g_mutex_lock (&interface->priv->lock);
ret = interface->priv->object;
g_mutex_unlock (&interface->priv->lock);
return ret;
}
static GDBusObject *
g_dbus_interface_skeleton_dup_object (GDBusInterface *interface_)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
GDBusObject *ret;
g_mutex_lock (&interface->priv->lock);
ret = interface->priv->object;
if (ret != NULL)
g_object_ref (ret);
g_mutex_unlock (&interface->priv->lock);
return ret;
}
static void
g_dbus_interface_skeleton_set_object (GDBusInterface *interface_,
GDBusObject *object)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
g_mutex_lock (&interface->priv->lock);
if (interface->priv->object != NULL)
g_object_remove_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
interface->priv->object = object;
if (object != NULL)
g_object_add_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
g_mutex_unlock (&interface->priv->lock);
}
static void
dbus_interface_interface_init (GDBusInterfaceIface *iface)
{
iface->get_info = _g_dbus_interface_skeleton_get_info;
iface->get_object = g_dbus_interface_skeleton_get_object;
iface->dup_object = g_dbus_interface_skeleton_dup_object;
iface->set_object = g_dbus_interface_skeleton_set_object;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
volatile gint ref_count;
GDBusInterfaceSkeleton *interface;
GDBusInterfaceMethodCallFunc method_call_func;
GDBusMethodInvocation *invocation;
} DispatchData;
static void
dispatch_data_unref (DispatchData *data)
{
if (g_atomic_int_dec_and_test (&data->ref_count))
g_slice_free (DispatchData, data);
}
static DispatchData *
dispatch_data_ref (DispatchData *data)
{
g_atomic_int_inc (&data->ref_count);
return data;
}
static gboolean
dispatch_invoke_in_context_func (gpointer user_data)
{
DispatchData *data = user_data;
data->method_call_func (g_dbus_method_invocation_get_connection (data->invocation),
g_dbus_method_invocation_get_sender (data->invocation),
g_dbus_method_invocation_get_object_path (data->invocation),
g_dbus_method_invocation_get_interface_name (data->invocation),
g_dbus_method_invocation_get_method_name (data->invocation),
g_dbus_method_invocation_get_parameters (data->invocation),
data->invocation,
g_dbus_method_invocation_get_user_data (data->invocation));
return FALSE;
}
static void
dispatch_in_thread_func (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
DispatchData *data = task_data;
GDBusInterfaceSkeletonFlags flags;
GDBusObject *object;
gboolean authorized;
g_mutex_lock (&data->interface->priv->lock);
flags = data->interface->priv->flags;
object = data->interface->priv->object;
if (object != NULL)
g_object_ref (object);
g_mutex_unlock (&data->interface->priv->lock);
/* first check on the enclosing object (if any), then the interface */
authorized = TRUE;
if (object != NULL)
{
g_signal_emit_by_name (object,
"authorize-method",
data->interface,
data->invocation,
&authorized);
}
if (authorized)
{
g_signal_emit (data->interface,
signals[G_AUTHORIZE_METHOD_SIGNAL],
0,
data->invocation,
&authorized);
}
if (authorized)
{
gboolean run_in_thread;
run_in_thread = (flags & G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
if (run_in_thread)
{
/* might as well just re-use the existing thread */
data->method_call_func (g_dbus_method_invocation_get_connection (data->invocation),
g_dbus_method_invocation_get_sender (data->invocation),
g_dbus_method_invocation_get_object_path (data->invocation),
g_dbus_method_invocation_get_interface_name (data->invocation),
g_dbus_method_invocation_get_method_name (data->invocation),
g_dbus_method_invocation_get_parameters (data->invocation),
data->invocation,
g_dbus_method_invocation_get_user_data (data->invocation));
}
else
{
/* bah, back to original context */
g_main_context_invoke_full (g_task_get_context (task),
g_task_get_priority (task),
dispatch_invoke_in_context_func,
dispatch_data_ref (data),
(GDestroyNotify) dispatch_data_unref);
}
}
else
{
/* do nothing */
}
if (object != NULL)
g_object_unref (object);
}
static void
g_dbus_interface_method_dispatch_helper (GDBusInterfaceSkeleton *interface,
GDBusInterfaceMethodCallFunc method_call_func,
GDBusMethodInvocation *invocation)
{
gboolean has_handlers;
gboolean has_default_class_handler;
gboolean emit_authorized_signal;
gboolean run_in_thread;
GDBusInterfaceSkeletonFlags flags;
GDBusObject *object;
g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface));
g_return_if_fail (method_call_func != NULL);
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_mutex_lock (&interface->priv->lock);
flags = interface->priv->flags;
object = interface->priv->object;
if (object != NULL)
g_object_ref (object);
g_mutex_unlock (&interface->priv->lock);
/* optimization for the common case where
*
* a) no handler is connected and class handler is not overridden (both interface and object); and
* b) method calls are not dispatched in a thread
*/
has_handlers = g_signal_has_handler_pending (interface,
signals[G_AUTHORIZE_METHOD_SIGNAL],
0,
TRUE);
has_default_class_handler = (G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface)->g_authorize_method ==
g_dbus_interface_skeleton_g_authorize_method_default);
emit_authorized_signal = (has_handlers || !has_default_class_handler);
if (!emit_authorized_signal)
{
if (object != NULL)
emit_authorized_signal = _g_dbus_object_skeleton_has_authorize_method_handlers (G_DBUS_OBJECT_SKELETON (object));
}
run_in_thread = (flags & G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
if (!emit_authorized_signal && !run_in_thread)
{
method_call_func (g_dbus_method_invocation_get_connection (invocation),
g_dbus_method_invocation_get_sender (invocation),
g_dbus_method_invocation_get_object_path (invocation),
g_dbus_method_invocation_get_interface_name (invocation),
g_dbus_method_invocation_get_method_name (invocation),
g_dbus_method_invocation_get_parameters (invocation),
invocation,
g_dbus_method_invocation_get_user_data (invocation));
}
else
{
GTask *task;
DispatchData *data;
data = g_slice_new0 (DispatchData);
data->interface = interface;
data->method_call_func = method_call_func;
data->invocation = invocation;
data->ref_count = 1;
task = g_task_new (interface, NULL, NULL, NULL);
g_task_set_source_tag (task, g_dbus_interface_method_dispatch_helper);
g_task_set_task_data (task, data, (GDestroyNotify) dispatch_data_unref);
g_task_run_in_thread (task, dispatch_in_thread_func);
g_object_unref (task);
}
if (object != NULL)
g_object_unref (object);
}
static void
skeleton_intercept_handle_method_call (GDBusConnection *connection,
const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
GDBusMethodInvocation *invocation,
gpointer user_data)
{
GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (user_data);
g_dbus_interface_method_dispatch_helper (interface,
g_dbus_interface_skeleton_get_vtable (interface)->method_call,
invocation);
}
/* ---------------------------------------------------------------------------------------------------- */
static ConnectionData *
new_connection (GDBusConnection *connection,
guint registration_id)
{
ConnectionData *data;
data = g_slice_new0 (ConnectionData);
data->connection = g_object_ref (connection);
data->registration_id = registration_id;
return data;
}
static void
free_connection (ConnectionData *data)
{
if (data != NULL)
{
g_object_unref (data->connection);
g_slice_free (ConnectionData, data);
}
}
static gboolean
add_connection_locked (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection,
GError **error)
{
ConnectionData *data;
guint registration_id;
gboolean ret = FALSE;
if (interface_->priv->hooked_vtable == NULL)
{
/* Hook the vtable since we need to intercept method calls for
* ::g-authorize-method and for dispatching in thread vs
* context
*
* We need to wait until subclasses have had time to initialize
* properly before building the hooked_vtable, so we create it
* once at the last minute.
*/
interface_->priv->hooked_vtable = g_memdup (g_dbus_interface_skeleton_get_vtable (interface_), sizeof (GDBusInterfaceVTable));
interface_->priv->hooked_vtable->method_call = skeleton_intercept_handle_method_call;
}
registration_id = g_dbus_connection_register_object (connection,
interface_->priv->object_path,
g_dbus_interface_skeleton_get_info (interface_),
interface_->priv->hooked_vtable,
interface_,
NULL, /* user_data_free_func */
error);
if (registration_id > 0)
{
data = new_connection (connection, registration_id);
interface_->priv->connections = g_slist_append (interface_->priv->connections, data);
ret = TRUE;
}
return ret;
}
static void
remove_connection_locked (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection)
{
ConnectionData *data;
GSList *l;
/* Get the connection in the list and unregister ... */
for (l = interface_->priv->connections; l != NULL; l = l->next)
{
data = l->data;
if (data->connection == connection)
{
g_warn_if_fail (g_dbus_connection_unregister_object (data->connection, data->registration_id));
free_connection (data);
interface_->priv->connections = g_slist_delete_link (interface_->priv->connections, l);
/* we are guaranteed that the connection is only added once, so bail out early */
goto out;
}
}
out:
;
}
static void
set_object_path_locked (GDBusInterfaceSkeleton *interface_,
const gchar *object_path)
{
if (g_strcmp0 (interface_->priv->object_path, object_path) != 0)
{
g_free (interface_->priv->object_path);
interface_->priv->object_path = g_strdup (object_path);
}
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_interface_skeleton_get_connection:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets the first connection that @interface_ is exported on, if any.
*
* Returns: (transfer none): A #GDBusConnection or %NULL if @interface_ is
* not exported anywhere. Do not free, the object belongs to @interface_.
*
* Since: 2.30
*/
GDBusConnection *
g_dbus_interface_skeleton_get_connection (GDBusInterfaceSkeleton *interface_)
{
ConnectionData *data;
GDBusConnection *ret;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
g_mutex_lock (&interface_->priv->lock);
ret = NULL;
if (interface_->priv->connections != NULL)
{
data = interface_->priv->connections->data;
if (data != NULL)
ret = data->connection;
}
g_mutex_unlock (&interface_->priv->lock);
return ret;
}
/**
* g_dbus_interface_skeleton_get_connections:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets a list of the connections that @interface_ is exported on.
*
* Returns: (element-type GDBusConnection) (transfer full): A list of
* all the connections that @interface_ is exported on. The returned
* list should be freed with g_list_free() after each element has
* been freed with g_object_unref().
*
* Since: 2.32
*/
GList *
g_dbus_interface_skeleton_get_connections (GDBusInterfaceSkeleton *interface_)
{
GList *connections;
GSList *l;
ConnectionData *data;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
g_mutex_lock (&interface_->priv->lock);
connections = NULL;
for (l = interface_->priv->connections; l != NULL; l = l->next)
{
data = l->data;
connections = g_list_prepend (connections,
/* Return a reference to each connection */
g_object_ref (data->connection));
}
g_mutex_unlock (&interface_->priv->lock);
return g_list_reverse (connections);
}
/**
* g_dbus_interface_skeleton_has_connection:
* @interface_: A #GDBusInterfaceSkeleton.
* @connection: A #GDBusConnection.
*
* Checks if @interface_ is exported on @connection.
*
* Returns: %TRUE if @interface_ is exported on @connection, %FALSE otherwise.
*
* Since: 2.32
*/
gboolean
g_dbus_interface_skeleton_has_connection (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection)
{
GSList *l;
gboolean ret = FALSE;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), FALSE);
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_mutex_lock (&interface_->priv->lock);
for (l = interface_->priv->connections; l != NULL; l = l->next)
{
ConnectionData *data = l->data;
if (data->connection == connection)
{
ret = TRUE;
goto out;
}
}
out:
g_mutex_unlock (&interface_->priv->lock);
return ret;
}
/**
* g_dbus_interface_skeleton_get_object_path:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Gets the object path that @interface_ is exported on, if any.
*
* Returns: A string owned by @interface_ or %NULL if @interface_ is not exported
* anywhere. Do not free, the string belongs to @interface_.
*
* Since: 2.30
*/
const gchar *
g_dbus_interface_skeleton_get_object_path (GDBusInterfaceSkeleton *interface_)
{
const gchar *ret;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
g_mutex_lock (&interface_->priv->lock);
ret = interface_->priv->object_path;
g_mutex_unlock (&interface_->priv->lock);
return ret;
}
/**
* g_dbus_interface_skeleton_export:
* @interface_: The D-Bus interface to export.
* @connection: A #GDBusConnection to export @interface_ on.
* @object_path: The path to export the interface at.
* @error: Return location for error or %NULL.
*
* Exports @interface_ at @object_path on @connection.
*
* This can be called multiple times to export the same @interface_
* onto multiple connections however the @object_path provided must be
* the same for all connections.
*
* Use g_dbus_interface_skeleton_unexport() to unexport the object.
*
* Returns: %TRUE if the interface was exported on @connection, otherwise %FALSE with
* @error set.
*
* Since: 2.30
*/
gboolean
g_dbus_interface_skeleton_export (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection,
const gchar *object_path,
GError **error)
{
gboolean ret = FALSE;
g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), FALSE);
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (g_variant_is_object_path (object_path), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
/* Assert that the object path is the same for multiple connections here */
g_return_val_if_fail (interface_->priv->object_path == NULL ||
g_strcmp0 (interface_->priv->object_path, object_path) == 0, FALSE);
g_mutex_lock (&interface_->priv->lock);
/* Set the object path */
set_object_path_locked (interface_, object_path);
/* Add the connection */
ret = add_connection_locked (interface_, connection, error);
g_mutex_unlock (&interface_->priv->lock);
return ret;
}
/**
* g_dbus_interface_skeleton_unexport:
* @interface_: A #GDBusInterfaceSkeleton.
*
* Stops exporting @interface_ on all connections it is exported on.
*
* To unexport @interface_ from only a single connection, use
* g_dbus_interface_skeleton_unexport_from_connection()
*
* Since: 2.30
*/
void
g_dbus_interface_skeleton_unexport (GDBusInterfaceSkeleton *interface_)
{
g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
g_return_if_fail (interface_->priv->connections != NULL);
g_mutex_lock (&interface_->priv->lock);
g_assert (interface_->priv->object_path != NULL);
g_assert (interface_->priv->hooked_vtable != NULL);
/* Remove all connections */
while (interface_->priv->connections != NULL)
{
ConnectionData *data = interface_->priv->connections->data;
remove_connection_locked (interface_, data->connection);
}
/* Unset the object path since there are no connections left */
set_object_path_locked (interface_, NULL);
g_mutex_unlock (&interface_->priv->lock);
}
/**
* g_dbus_interface_skeleton_unexport_from_connection:
* @interface_: A #GDBusInterfaceSkeleton.
* @connection: A #GDBusConnection.
*
* Stops exporting @interface_ on @connection.
*
* To stop exporting on all connections the interface is exported on,
* use g_dbus_interface_skeleton_unexport().
*
* Since: 2.32
*/
void
g_dbus_interface_skeleton_unexport_from_connection (GDBusInterfaceSkeleton *interface_,
GDBusConnection *connection)
{
g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail (interface_->priv->connections != NULL);
g_mutex_lock (&interface_->priv->lock);
g_assert (interface_->priv->object_path != NULL);
g_assert (interface_->priv->hooked_vtable != NULL);
remove_connection_locked (interface_, connection);
/* Reset the object path if we removed the last connection */
if (interface_->priv->connections == NULL)
set_object_path_locked (interface_, NULL);
g_mutex_unlock (&interface_->priv->lock);
}
/* ---------------------------------------------------------------------------------------------------- */
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