4d442bca30
This patch reduces the number of exception types by facilitating globally defined exceptions for common usage patterns shared by most services. In particular, RPC functions that demand a session-resource upgrade not longer reflect this condition via a session-specific exception but via the 'Out_of_ram' or 'Out_of_caps' types. Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable', 'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'. This consolidation eases the error handling (there are fewer exceptions to handle), alleviates the need to convert exceptions along the session-creation call chain, and avoids possible aliasing problems (catching the wrong type with the same name but living in a different scope).
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
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* \brief Root interface
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* \author Norman Feske
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* \date 2006-05-11
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*/
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/*
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* Copyright (C) 2006-2017 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 _INCLUDE__ROOT__ROOT_H_
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#define _INCLUDE__ROOT__ROOT_H_
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#include <base/exception.h>
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#include <base/rpc.h>
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#include <base/rpc_args.h>
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#include <base/affinity.h>
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#include <session/capability.h>
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namespace Genode {
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struct Root;
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template <typename> struct Typed_root;
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}
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struct Genode::Root
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{
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typedef Rpc_in_buffer<160> Session_args;
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typedef Rpc_in_buffer<160> Upgrade_args;
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virtual ~Root() { }
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/**
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* Create session
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*
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* \throw Insufficient_ram_quota
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* \throw Insufficient_cap_quota
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* \throw Service_denied
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*
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* \return capability to new session
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*/
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virtual Session_capability session(Session_args const &args,
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Affinity const &affinity) = 0;
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/**
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* Extend resource donation to an existing session
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*/
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virtual void upgrade(Session_capability session, Upgrade_args const &args) = 0;
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/**
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* Close session
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*/
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virtual void close(Session_capability session) = 0;
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/*********************
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** RPC declaration **
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*********************/
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GENODE_RPC_THROW(Rpc_session, Session_capability, session,
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GENODE_TYPE_LIST(Service_denied, Insufficient_ram_quota,
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Insufficient_cap_quota),
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Session_args const &, Affinity const &);
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GENODE_RPC(Rpc_upgrade, void, upgrade,
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Session_capability, Upgrade_args const &);
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GENODE_RPC(Rpc_close, void, close, Session_capability);
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GENODE_RPC_INTERFACE(Rpc_session, Rpc_upgrade, Rpc_close);
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};
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/**
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* Root interface supplemented with information about the managed
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* session type
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*
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* This class template is used to automatically propagate the
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* correct session type to 'Parent::announce()' when announcing
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* a service.
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*/
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template <typename SESSION_TYPE>
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struct Genode::Typed_root : Root
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{
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typedef SESSION_TYPE Session_type;
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};
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#endif /* _INCLUDE__ROOT__ROOT_H_ */
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