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On Linux, we want to attach additional attributes to processes, i.e., the chroot location, the designated UID, and GID. Instead of polluting the generic code with such Linux-specific platform details, I introduced the new 'Native_pd_args' type, which can be customized for each platform. The platform-dependent policy of init is factored out in the new 'pd_args' library. The new 'base-linux/run/lx_pd_args.run' script can be used to validate the propagation of those attributes into core. Note that this patch does not add the interpretation of the new UID and PID attributes by core. This will be subject of a follow-up patch. Related to #510.
101 lines
2.4 KiB
C++
101 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 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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/**
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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=4K, 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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