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99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
/*
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* \brief Signal session interface
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* \author Norman Feske
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* \date 2009-08-05
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*/
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/*
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* Copyright (C) 2009-2013 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__SIGNAL_SESSION__SIGNAL_SESSION_H_
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#define _INCLUDE__SIGNAL_SESSION__SIGNAL_SESSION_H_
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#include <base/capability.h>
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#include <base/exception.h>
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#include <signal_session/source.h>
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#include <session/session.h>
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namespace Genode {
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class Signal_context;
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class Signal_receiver;
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typedef Capability<Signal_receiver> Signal_receiver_capability;
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typedef Capability<Signal_context> Signal_context_capability;
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typedef Capability<Signal_source> Signal_source_capability;
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struct Signal_session : Session
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{
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static const char *service_name() { return "SIGNAL"; }
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virtual ~Signal_session() { }
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class Out_of_metadata : public Exception { };
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/**
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* Request capability for the signal-source interface
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*/
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virtual Signal_source_capability signal_source() = 0;
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/**
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* Allocate signal context
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*
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* \param imprint opaque value that gets delivered with signals
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* originating from the allocated signal-context
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* capability
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* \return new signal-context capability
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* \throw Out_of_metadata
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*/
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virtual Signal_context_capability alloc_context(long imprint) = 0;
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/**
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* Free signal-context
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*
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* \param cap capability of signal-context to release
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*/
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virtual void free_context(Signal_context_capability cap) = 0;
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/**
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* Submit signals to the specified signal context
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*
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* \param context signal destination
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* \param cnt number of signals to submit at once
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*
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* Note that the 'context' argument does not necessarily belong to
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* the signal session. Normally, it is a capability obtained from
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* a potentially untrusted source. Because we cannot trust this
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* capability, signals are not submitted by invoking 'cap' directly
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* but by using it as argument to our trusted signal-session
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* interface. Otherwise, a potential signal receiver could supply
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* a capability with a blocking interface to compromise the
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* nonblocking behaviour of the submit function.
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*/
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virtual void submit(Signal_context_capability context,
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unsigned cnt = 1) = 0;
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/*********************
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** RPC declaration **
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*********************/
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GENODE_RPC(Rpc_signal_source, Signal_source_capability, signal_source);
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GENODE_RPC_THROW(Rpc_alloc_context, Signal_context_capability, alloc_context,
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GENODE_TYPE_LIST(Out_of_metadata), long);
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GENODE_RPC(Rpc_free_context, void, free_context, Signal_context_capability);
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GENODE_RPC(Rpc_submit, void, submit, Signal_context_capability, unsigned);
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GENODE_RPC_INTERFACE(Rpc_submit, Rpc_signal_source, Rpc_alloc_context,
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Rpc_free_context);
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};
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}
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#endif /* _INCLUDE__CAP_SESSION__CAP_SESSION_H_ */
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