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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* \brief ROM service provided to Noux processes
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* \author Norman Feske
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* \date 2013-07-18
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*
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* The local ROM service has the sole purpose of tracking ROM dataspaces
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* so that they are properly detached from RM sessions when the corresponding
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* ROM sessions are closed.
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*/
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/*
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* Copyright (C) 2013-2017 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 _NOUX__LOCAL_ROM_SERVICE_H_
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#define _NOUX__LOCAL_ROM_SERVICE_H_
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/* Genode includes */
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#include <base/service.h>
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/* Noux includes */
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#include <dataspace_registry.h>
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#include <rom_session_component.h>
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namespace Noux {
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typedef Local_service<Rom_session_component> Local_rom_service;
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class Local_rom_factory;
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}
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class Noux::Local_rom_factory : public Local_rom_service::Factory
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{
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private:
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Allocator &_alloc;
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Env &_env;
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Rpc_entrypoint &_ep;
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Vfs::Dir_file_system &_root_dir;
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Dataspace_registry &_registry;
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public:
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Local_rom_factory(Allocator &alloc, Env &env, Rpc_entrypoint &ep,
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Vfs::Dir_file_system &root_dir,
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Dataspace_registry ®istry)
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:
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_alloc(alloc), _env(env), _ep(ep), _root_dir(root_dir), _registry(registry)
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{ }
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Rom_session_component &create(Args const &args, Affinity) override
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{
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try {
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Rom_session_component::Name const rom_name =
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label_from_args(args.string()).last_element();
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return *new (_alloc)
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Rom_session_component(_alloc, _env, _ep, _root_dir, _registry, rom_name);
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}
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catch (Rom_connection::Rom_connection_failed) {
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throw Service_denied(); }
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}
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void upgrade(Rom_session_component &, Args const &) override { }
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void destroy(Rom_session_component &session) override
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{
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Genode::destroy(_alloc, &session);
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}
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};
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#endif /* _NOUX__LOCAL_ROM_SERVICE_H_ */
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