6184a27619
This patch changes init's service forwarding such that pending requests are kept unanswered as long as the requested service is not present (yet). In dynamic-init scenarios, this is needed in situtions where the dynamic init is known to eventually provide the service but the internal subsystem is not ready yet. Previously, a client that attempted to request a session in this early phase would get a 'Service_denied' exception. By deferring the forwarding in this situation, the behaviour becomes deterministic. If a matching '<service>' exists but there is no matching policy sub node, the request is answered with 'Service_denied' - as expected.
118 lines
2.6 KiB
C++
118 lines
2.6 KiB
C++
/*
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* \brief Server role of init, forwarding session requests to children
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* \author Norman Feske
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* \date 2017-03-07
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _SRC__INIT__SERVER_H_
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#define _SRC__INIT__SERVER_H_
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/* Genode includes */
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#include <base/attached_rom_dataspace.h>
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/* local includes */
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#include <types.h>
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#include <service.h>
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#include <buffered_xml.h>
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#include <state_reporter.h>
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namespace Init { class Server; }
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class Init::Server : Session_state::Ready_callback,
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Session_state::Closed_callback
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{
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private:
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struct Route
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{
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Routed_service &service;
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Session_label label;
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};
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Env &_env;
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Allocator &_alloc;
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/*
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* ID space of requests originating from the parent
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*/
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Id_space<Parent::Server> _server_id_space;
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/*
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* ID space of requests issued to the children of init
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*/
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Id_space<Parent::Client> _client_id_space;
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/**
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* Exception type
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*/
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class Service_not_present : Exception { };
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/**
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* Meta data of service provided to our parent
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*/
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struct Service;
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Registry<Service> _services;
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/**
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* Services provided by our children
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*/
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Registry<Routed_service> &_child_services;
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Report_update_trigger &_report_update_trigger;
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Constructible<Attached_rom_dataspace> _session_requests;
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Constructible<Signal_handler<Server> > _session_request_handler;
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/**
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* \throw Service_denied
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*/
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Route _resolve_session_request(Genode::Service::Name const &,
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Session_label const &);
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void _handle_create_session_request (Xml_node, Parent::Client::Id);
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void _handle_upgrade_session_request(Xml_node, Parent::Client::Id);
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void _handle_close_session_request (Xml_node, Parent::Client::Id);
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void _handle_session_request(Xml_node);
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void _handle_session_requests();
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/**
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* Session_state::Closed_callback interface
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*/
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void session_closed(Session_state &) override;
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/**
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* Session_state::Ready_callback interface
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*/
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void session_ready(Session_state &) override;
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public:
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/**
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* Constructor
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*
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* \param alloc allocator used for buffering XML config data and
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* for allocating per-service meta data
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*/
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Server(Env &env, Allocator &alloc, Registry<Routed_service> &services,
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Report_update_trigger &report_update_trigger)
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:
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_env(env), _alloc(alloc), _child_services(services),
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_report_update_trigger(report_update_trigger)
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{ }
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void apply_config(Xml_node);
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};
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#endif /* _SRC__INIT__SERVER_H_ */
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