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5d678dba9e
While importing trace sources as trace subjects into a TRACE session, the session quota might become depleted. The TRACE session already keeps track of the session quota via an allocator guard but the 'subjects' RPC function missed to handle the out-of-memory condition. This patch reflects the error condition as an 'Out_of_metadata' exception to the TRACE client. It also contains an extension of the trace test to exercise the corner case.
109 lines
2.6 KiB
C++
109 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 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 _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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char *base;
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size_t size;
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Argument_buffer(Dataspace_capability ds)
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:
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base(env()->rm_session()->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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env()->rm_session()->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(Capability<Trace::Session> session)
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:
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Rpc_client<Trace::Session>(session),
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_argument_buffer(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_metadata
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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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