static void
verify_list (DBusList **list)
{
DBusList *link;
int length;
link = *list;
if (link == NULL)
return;
if (link->next == link)
{
_dbus_assert (link->prev == link);
_dbus_assert (*list == link);
return;
}
length = 0;
do
{
length += 1;
_dbus_assert (link->prev->next == link);
_dbus_assert (link->next->prev == link);
link = link->next;
}
while (link != *list);
_dbus_assert (length == _dbus_list_get_length (list));
if (length == 1)
_dbus_assert (_dbus_list_length_is_one (list));
else
_dbus_assert (!_dbus_list_length_is_one (list));
}
/* this function is self-cancelling if you cancel the transaction */
dbus_bool_t
bus_service_remove_owner (BusService *service,
DBusConnection *connection,
BusTransaction *transaction,
DBusError *error)
{
BusOwner *primary_owner;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
/* We send out notifications before we do any work we
* might have to undo if the notification-sending failed
*/
/* Send service lost message */
primary_owner = bus_service_get_primary_owner (service);
if (primary_owner != NULL && primary_owner->conn == connection)
{
if (!bus_driver_send_service_lost (connection, service->name,
transaction, error))
return FALSE;
}
else
{
/* if we are not the primary owner then just remove us from the queue */
DBusList *link;
BusOwner *temp_owner;
link = _bus_service_find_owner_link (service, connection);
_dbus_list_unlink (&service->owners, link);
temp_owner = (BusOwner *)link->data;
bus_owner_unref (temp_owner);
_dbus_list_free_link (link);
return TRUE;
}
if (service->owners == NULL)
{
_dbus_assert_not_reached ("Tried to remove owner of a service that has no owners");
}
else if (_dbus_list_length_is_one (&service->owners))
{
if (!bus_driver_send_service_owner_changed (service->name,
bus_connection_get_name (connection),
NULL,
transaction, error))
return FALSE;
}
else
{
DBusList *link;
BusOwner *new_owner;
DBusConnection *new_owner_conn;
link = _dbus_list_get_first_link (&service->owners);
_dbus_assert (link != NULL);
link = _dbus_list_get_next_link (&service->owners, link);
_dbus_assert (link != NULL);
new_owner = (BusOwner *)link->data;
new_owner_conn = new_owner->conn;
if (!bus_driver_send_service_owner_changed (service->name,
bus_connection_get_name (connection),
bus_connection_get_name (new_owner_conn),
transaction, error))
return FALSE;
/* This will be our new owner */
if (!bus_driver_send_service_acquired (new_owner_conn,
service->name,
transaction,
error))
return FALSE;
}
if (!add_restore_ownership_to_transaction (transaction, service, primary_owner))
{
BUS_SET_OOM (error);
return FALSE;
}
bus_service_unlink_owner (service, primary_owner);
if (service->owners == NULL)
bus_service_unlink (service);
return TRUE;
}
dbus_bool_t
bus_service_swap_owner (BusService *service,
DBusConnection *connection,
BusTransaction *transaction,
DBusError *error)
{
DBusList *swap_link;
BusOwner *primary_owner;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
/* We send out notifications before we do any work we
* might have to undo if the notification-sending failed
*/
/* Send service lost message */
primary_owner = bus_service_get_primary_owner (service);
if (primary_owner == NULL || primary_owner->conn != connection)
_dbus_assert_not_reached ("Tried to swap a non primary owner");
if (!bus_driver_send_service_lost (connection, service->name,
transaction, error))
return FALSE;
if (service->owners == NULL)
{
_dbus_assert_not_reached ("Tried to swap owner of a service that has no owners");
}
else if (_dbus_list_length_is_one (&service->owners))
{
_dbus_assert_not_reached ("Tried to swap owner of a service that has no other owners in the queue");
}
else
{
DBusList *link;
BusOwner *new_owner;
DBusConnection *new_owner_conn;
link = _dbus_list_get_first_link (&service->owners);
_dbus_assert (link != NULL);
link = _dbus_list_get_next_link (&service->owners, link);
_dbus_assert (link != NULL);
new_owner = (BusOwner *)link->data;
new_owner_conn = new_owner->conn;
if (!bus_driver_send_service_owner_changed (service->name,
bus_connection_get_name (connection),
bus_connection_get_name (new_owner_conn),
transaction, error))
return FALSE;
/* This will be our new owner */
if (!bus_driver_send_service_acquired (new_owner_conn,
service->name,
transaction,
error))
return FALSE;
}
if (!add_restore_ownership_to_transaction (transaction, service, primary_owner))
{
BUS_SET_OOM (error);
return FALSE;
}
/* unlink the primary and make it the second link */
swap_link = _dbus_list_get_first_link (&service->owners);
_dbus_list_unlink (&service->owners, swap_link);
_dbus_list_insert_after_link (&service->owners,
_dbus_list_get_first_link (&service->owners),
swap_link);
return TRUE;
}
