genode/base/include/trace_session/client.h

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/*
* \brief Client-side TRACE session interface
* \author Norman Feske
* \date 2013-08-12
*/
/*
* Copyright (C) 2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__TRACE_SESSION__CLIENT_H_
#define _INCLUDE__TRACE_SESSION__CLIENT_H_
#include <trace_session/trace_session.h>
#include <base/rpc_client.h>
#include <base/env.h>
namespace Genode { namespace Trace { struct Session_client; } }
struct Genode::Trace::Session_client : Genode::Rpc_client<Genode::Trace::Session>
{
private:
/**
* Shared-memory buffer used for carrying the payload of the
* 'subjects()' RPC function.
*/
struct Argument_buffer
{
char *base;
size_t size;
Argument_buffer(Dataspace_capability ds)
:
base(env()->rm_session()->attach(ds)),
size(ds.call<Dataspace::Rpc_size>())
{ }
~Argument_buffer()
{
env()->rm_session()->detach(base);
}
};
Argument_buffer _argument_buffer;
public:
/**
* Constructor
*/
explicit Session_client(Capability<Trace::Session> session)
:
Rpc_client<Trace::Session>(session),
_argument_buffer(call<Rpc_dataspace>())
{ }
/**
* Retrieve subject directory
*/
size_t subjects(Subject_id *dst, size_t dst_len)
{
size_t const num_subjects = min(call<Rpc_subjects>(), dst_len);
memcpy(dst, _argument_buffer.base, dst_len*sizeof(Subject_id));
return num_subjects;
}
Policy_id alloc_policy(size_t size) {
return call<Rpc_alloc_policy>(size); }
Dataspace_capability policy(Policy_id policy_id) {
return call<Rpc_policy>(policy_id); }
void unload_policy(Policy_id policy_id) {
call<Rpc_unload_policy>(policy_id); }
void trace(Subject_id s, Policy_id p, size_t buffer_size) {
call<Rpc_trace>(s, p, buffer_size); }
void rule(Session_label const &label, Thread_name const &thread,
Policy_id policy, size_t buffer_size) {
call<Rpc_rule>(label, thread, policy, buffer_size); }
void pause(Subject_id subject) {
call<Rpc_pause>(subject); }
void resume(Subject_id subject) {
call<Rpc_resume>(subject); }
Subject_info subject_info(Subject_id subject) {
return call<Rpc_subject_info>(subject); }
Dataspace_capability buffer(Subject_id subject) {
return call<Rpc_buffer>(subject); }
void free(Subject_id subject) {
call<Rpc_free>(subject); }
};
#endif /* _INCLUDE__TRACE_SESSION__CLIENT_H_ */