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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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
/*
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* \brief Client-side TRACE session 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 _INCLUDE__TRACE_SESSION__CLIENT_H_
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#define _INCLUDE__TRACE_SESSION__CLIENT_H_
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#include <trace_session/trace_session.h>
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#include <base/rpc_client.h>
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#include <base/env.h>
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namespace Genode { namespace Trace { struct Session_client; } }
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struct Genode::Trace::Session_client : Genode::Rpc_client<Genode::Trace::Session>
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{
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private:
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/**
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* Shared-memory buffer used for carrying the payload of the
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* 'subjects()' RPC function.
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*/
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struct Argument_buffer
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{
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Region_map &rm;
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char *base;
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size_t size;
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Argument_buffer(Region_map &rm, Dataspace_capability ds)
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:
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rm(rm),
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base(rm.attach(ds)),
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size(ds.call<Dataspace::Rpc_size>())
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{ }
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~Argument_buffer()
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{
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rm.detach(base);
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}
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};
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Argument_buffer _argument_buffer;
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public:
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/**
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* Constructor
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*/
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explicit Session_client(Region_map &rm, Capability<Trace::Session> session)
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:
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Rpc_client<Trace::Session>(session),
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_argument_buffer(rm, call<Rpc_dataspace>())
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{ }
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/**
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* Retrieve subject directory
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*
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* \throw Out_of_ram
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* \throw Out_of_caps
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*/
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size_t subjects(Subject_id *dst, size_t dst_len)
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{
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size_t const num_subjects = min(call<Rpc_subjects>(), dst_len);
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memcpy(dst, _argument_buffer.base, dst_len*sizeof(Subject_id));
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return num_subjects;
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}
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Policy_id alloc_policy(size_t size) override {
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return call<Rpc_alloc_policy>(size); }
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Dataspace_capability policy(Policy_id policy_id) override {
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return call<Rpc_policy>(policy_id); }
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void unload_policy(Policy_id policy_id) override {
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call<Rpc_unload_policy>(policy_id); }
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void trace(Subject_id s, Policy_id p, size_t buffer_size) override {
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call<Rpc_trace>(s, p, buffer_size); }
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void rule(Session_label const &label, Thread_name const &thread,
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Policy_id policy, size_t buffer_size) override {
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call<Rpc_rule>(label, thread, policy, buffer_size); }
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void pause(Subject_id subject) override {
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call<Rpc_pause>(subject); }
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void resume(Subject_id subject) override {
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call<Rpc_resume>(subject); }
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Subject_info subject_info(Subject_id subject) override {
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return call<Rpc_subject_info>(subject); }
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Dataspace_capability buffer(Subject_id subject) override {
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return call<Rpc_buffer>(subject); }
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void free(Subject_id subject) override {
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call<Rpc_free>(subject); }
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};
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#endif /* _INCLUDE__TRACE_SESSION__CLIENT_H_ */
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