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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/*
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* \brief ROM service provided to Noux processes for initial ROMs
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* \author Christian Prochaska
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* \date 2017-01-31
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*
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* The initial ROMs (binary and linker) are already attached in a forked
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* child and don't need a new ROM dataspace.
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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 General Public License version 2.
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*/
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#ifndef _NOUX__EMPTY_ROM_SERVICE_H_
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#define _NOUX__EMPTY_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 <empty_rom_session_component.h>
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namespace Noux {
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typedef Local_service<Empty_rom_session_component> Empty_rom_service;
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class Empty_rom_factory;
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}
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class Noux::Empty_rom_factory : public Empty_rom_service::Factory
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{
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private:
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Allocator &_alloc;
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Rpc_entrypoint &_ep;
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public:
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Empty_rom_factory(Allocator &alloc, Rpc_entrypoint &ep)
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: _alloc(alloc), _ep(ep) { }
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Empty_rom_session_component &create(Args const &args, Affinity) override
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{
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try {
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return *new (_alloc) Empty_rom_session_component(_ep); }
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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(Empty_rom_session_component &, Args const &) override { }
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void destroy(Empty_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__EMPTY_ROM_SERVICE_H_ */
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