mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-22 15:02:25 +00:00
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
|
/*
|
||
|
|
* \brief Report session interface
|
||
|
|
* \author Norman Feske
|
||
|
|
* \date 2014-01-10
|
||
|
|
*
|
||
|
|
* A report session allows a client to report status information about itself
|
||
|
|
* to the outer world, in particular to its parent process.
|
||
|
|
*
|
||
|
|
* The communication between client and server is based on the combination
|
||
|
|
* of shared memory with synchronous RPC. A dataspace shared between both
|
||
|
|
* processes is used to carry the data. RPC calls are used to synchronize the
|
||
|
|
* access to the buffer. When the client performs an RPC, it hands over the
|
||
|
|
* responsibility to access the buffer to the server. While an RPC is in
|
||
|
|
* progress and the client blocks for the reply, the server may read and write
|
||
|
|
* the buffer. At all other times, the server is not expected to access the
|
||
|
|
* buffer.
|
||
|
|
*
|
||
|
|
* This hand over of the buffer between both parties is a mere convention. It
|
||
|
|
* is not enforced by the system. For this reason, neither of both proceess
|
||
|
|
* must keep its internal state stored in the buffer. Data should always be
|
||
|
|
* copied in/out and never processed directly in the buffer.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2014 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__REPORT_SESSION__REPORT_SESSION_H_
|
||
|
|
#define _INCLUDE__REPORT_SESSION__REPORT_SESSION_H_
|
||
|
|
|
||
|
|
/* Genode includes */
|
||
|
|
#include <session/session.h>
|
||
|
|
#include <base/rpc.h>
|
||
|
|
#include <base/signal.h>
|
||
|
|
#include <dataspace/capability.h>
|
||
|
|
|
||
|
|
namespace Report {
|
||
|
|
|
||
|
|
using Genode::Dataspace_capability;
|
||
|
|
using Genode::Signal_context_capability;
|
||
|
|
using Genode::size_t;
|
||
|
|
|
||
|
|
struct Session;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
struct Report::Session : Genode::Session
|
||
|
|
{
|
||
|
|
static const char *service_name() { return "Report"; }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Request the dataspace used to carry reports and responses
|
||
|
|
*/
|
||
|
|
virtual Dataspace_capability dataspace() = 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Submit data that is currently contained in the dataspace as report
|
||
|
|
*
|
||
|
|
* \param length length of report in bytes
|
||
|
|
*
|
||
|
|
* While this function is called, the information in the dataspace
|
||
|
|
* must not be modified by the client.
|
||
|
|
*/
|
||
|
|
virtual void submit(size_t length) = 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Install signal handler for response notifications
|
||
|
|
*/
|
||
|
|
virtual void response_sigh(Signal_context_capability) = 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Request a response from the recipient of reports
|
||
|
|
*
|
||
|
|
* By calling this function, the client expects that the server will
|
||
|
|
* replace the content of the dataspace with new information.
|
||
|
|
*
|
||
|
|
* \return length of response in bytes
|
||
|
|
*/
|
||
|
|
virtual size_t obtain_response() = 0;
|
||
|
|
|
||
|
|
|
||
|
|
/*******************
|
||
|
|
** RPC interface **
|
||
|
|
*******************/
|
||
|
|
|
||
|
|
GENODE_RPC(Rpc_dataspace, Dataspace_capability, dataspace);
|
||
|
|
GENODE_RPC(Rpc_submit, void, submit, size_t);
|
||
|
|
GENODE_RPC(Rpc_response_sigh, void, response_sigh, Signal_context_capability);
|
||
|
|
GENODE_RPC(Rpc_obtain_response, size_t, obtain_response);
|
||
|
|
GENODE_RPC_INTERFACE(Rpc_dataspace, Rpc_submit, Rpc_response_sigh,
|
||
|
|
Rpc_obtain_response);
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* _INCLUDE__REPORT_SESSION__REPORT_SESSION_H_ */
|