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This patch integrates the functionality of the former CAP session into the PD session and unifies the approch of supplementing the generic PD session with kernel-specific functionality. The latter is achieved by the new 'Native_pd' interface. The kernel-specific interface can be obtained via the Pd_session::native_pd accessor function. The kernel-specific interfaces are named Nova_native_pd, Foc_native_pd, and Linux_native_pd. The latter change allowed for to deduplication of the pd_session_component code among the various base platforms. To retain API compatibility, we keep the 'Cap_session' and 'Cap_connection' around. But those classes have become mere wrappers around the PD session interface. Issue #1841
103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
/*
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* \brief Connection to PD service
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* \author Norman Feske
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* \date 2012-11-21
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*
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* In contrast to the generic version of 'pd_session/connection.h', the
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* Linux-specific version supplies additional argument to core's PD service:
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*
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* :'root': is the path of a chroot environment of the process
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* :'uid': is the user ID of the process
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* :'gid': is the designated group ID of the process
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*/
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/*
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* Copyright (C) 2012-2013 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__PD_SESSION__CONNECTION_H_
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#define _INCLUDE__PD_SESSION__CONNECTION_H_
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#include <pd_session/client.h>
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#include <base/connection.h>
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namespace Genode {
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class Pd_connection : public Connection<Pd_session>, public Pd_session_client
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{
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private:
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template <Genode::size_t STRING_MAX_LEN>
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struct Arg
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{
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char string[STRING_MAX_LEN];
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Arg() { string[0] = 0; }
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};
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/**
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* Convert root path argument to session-construction parameter
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*/
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struct Root_arg : Arg<Native_pd_args::ROOT_PATH_MAX_LEN>
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{
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Root_arg(Native_pd_args const *args)
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{
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if (args && args->root() && args->root()[0])
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Genode::snprintf(string, sizeof(string), ", root=\"%s\"",
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args->root());
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}
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};
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/**
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* Convert UID argument to session-construction parameter
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*/
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struct Uid_arg : Arg<64>
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{
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Uid_arg(Native_pd_args const *args)
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{
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if (args && args->uid())
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Genode::snprintf(string, sizeof(string), ", uid=%u",
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args->uid());
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}
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};
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/**
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* Convert GID argument to session-construction parameter
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*/
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struct Gid_arg : Arg<64>
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{
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Gid_arg(Native_pd_args const *args)
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{
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if (args && args->gid())
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Genode::snprintf(string, sizeof(string), ", gid=%u",
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args->gid());
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}
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};
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public:
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enum { RAM_QUOTA = 4*1024 };
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/**
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* Constructor
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*
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* \param label session label
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* \param pd_args Linux-specific PD-session arguments
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*/
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Pd_connection(char const *label = "", Native_pd_args const *pd_args = 0)
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:
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Connection<Pd_session>(
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session("ram_quota=36K, label=\"%s\"%s%s%s", label,
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Root_arg(pd_args).string,
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Uid_arg(pd_args).string,
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Gid_arg(pd_args).string)),
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Pd_session_client(cap())
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{ }
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};
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}
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#endif /* _INCLUDE__PD_SESSION__CONNECTION_H_ */
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