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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/*
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* \brief TRACE root interface
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* \author Norman Feske
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* \date 2013-08-12
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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 _CORE__INCLUDE__TRACE__ROOT_H_
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#define _CORE__INCLUDE__TRACE__ROOT_H_
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/* Genode includes */
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#include <root/component.h>
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/* core-internal includes */
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#include <trace/session_component.h>
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namespace Genode { namespace Trace { class Root; } }
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class Genode::Trace::Root : public Genode::Root_component<Session_component>
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{
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private:
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Source_registry &_sources;
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Policy_registry &_policies;
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protected:
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Session_component *_create_session(const char *args)
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{
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size_t ram_quota = Arg_string::find_arg(args, "ram_quota").ulong_value(0);
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size_t arg_buffer_size = Arg_string::find_arg(args, "arg_buffer_size").ulong_value(0);
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unsigned parent_levels = Arg_string::find_arg(args, "parent_levels").ulong_value(0);
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if (arg_buffer_size > ram_quota)
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throw Service_denied();
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return new (md_alloc())
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Session_component(*md_alloc(), ram_quota, arg_buffer_size,
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parent_levels, label_from_args(args).string(), _sources, _policies);
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}
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void _upgrade_session(Session_component *s, const char *args)
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{
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size_t ram_quota = Arg_string::find_arg(args, "ram_quota").ulong_value(0);
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s->upgrade_ram_quota(ram_quota);
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}
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public:
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/**
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* Constructor
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*
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* \param session_ep entry point for managing session objects
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* \param md_alloc meta data allocator used by root component
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* \param ram_quota RAM for tracing purposes of this session
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* \param arg_buffer_size session argument-buffer size
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*/
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Root(Rpc_entrypoint *session_ep, Allocator *md_alloc,
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Source_registry &sources, Policy_registry &policies)
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:
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Root_component<Session_component>(session_ep, md_alloc),
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_sources(sources), _policies(policies)
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{ }
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};
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#endif /* _CORE__INCLUDE__TRACE__ROOT_H_ */
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