mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-30 18:47:01 +00:00
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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
|
|
* \brief Root interface
|
|
* \author Norman Feske
|
|
* \date 2006-05-11
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__ROOT__ROOT_H_
|
|
#define _INCLUDE__ROOT__ROOT_H_
|
|
|
|
#include <base/exception.h>
|
|
#include <base/rpc.h>
|
|
#include <base/rpc_args.h>
|
|
#include <base/affinity.h>
|
|
#include <session/capability.h>
|
|
|
|
namespace Genode {
|
|
|
|
struct Root;
|
|
template <typename> struct Typed_root;
|
|
}
|
|
|
|
|
|
struct Genode::Root
|
|
{
|
|
typedef Rpc_in_buffer<160> Session_args;
|
|
typedef Rpc_in_buffer<160> Upgrade_args;
|
|
|
|
virtual ~Root() { }
|
|
|
|
/**
|
|
* Create session
|
|
*
|
|
* \throw Insufficient_ram_quota
|
|
* \throw Insufficient_cap_quota
|
|
* \throw Service_denied
|
|
*
|
|
* \return capability to new session
|
|
*/
|
|
virtual Session_capability session(Session_args const &args,
|
|
Affinity const &affinity) = 0;
|
|
|
|
/**
|
|
* Extend resource donation to an existing session
|
|
*/
|
|
virtual void upgrade(Session_capability session, Upgrade_args const &args) = 0;
|
|
|
|
/**
|
|
* Close session
|
|
*/
|
|
virtual void close(Session_capability session) = 0;
|
|
|
|
|
|
/*********************
|
|
** RPC declaration **
|
|
*********************/
|
|
|
|
GENODE_RPC_THROW(Rpc_session, Session_capability, session,
|
|
GENODE_TYPE_LIST(Service_denied, Insufficient_ram_quota,
|
|
Insufficient_cap_quota),
|
|
Session_args const &, Affinity const &);
|
|
GENODE_RPC(Rpc_upgrade, void, upgrade,
|
|
Session_capability, Upgrade_args const &);
|
|
GENODE_RPC(Rpc_close, void, close, Session_capability);
|
|
|
|
GENODE_RPC_INTERFACE(Rpc_session, Rpc_upgrade, Rpc_close);
|
|
};
|
|
|
|
|
|
/**
|
|
* Root interface supplemented with information about the managed
|
|
* session type
|
|
*
|
|
* This class template is used to automatically propagate the
|
|
* correct session type to 'Parent::announce()' when announcing
|
|
* a service.
|
|
*/
|
|
template <typename SESSION_TYPE>
|
|
struct Genode::Typed_root : Root
|
|
{
|
|
typedef SESSION_TYPE Session_type;
|
|
};
|
|
|
|
#endif /* _INCLUDE__ROOT__ROOT_H_ */
|