359 lines
9.8 KiB
C++
359 lines
9.8 KiB
C++
/*
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* \brief Application child
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* \author Christian Prochaska
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* \date 2009-10-05
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*/
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/*
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* Copyright (C) 2009-2016 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 _APP_CHILD_H_
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#define _APP_CHILD_H_
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#include <stdio.h>
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#include <sys/stat.h>
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#include <base/child.h>
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#include <base/service.h>
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#include <init/child_config.h>
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#include <init/child_policy.h>
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#include <util/arg_string.h>
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#include "cpu_root.h"
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#include "genode_child_resources.h"
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#include "pd_session_component.h"
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#include "ram_root.h"
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#include "rom.h"
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namespace Gdb_monitor { class App_child; }
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class Gdb_monitor::App_child : public Child_policy,
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public Init::Child_policy_enforce_labeling
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{
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private:
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enum { STACK_SIZE = 4*1024*sizeof(long) };
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const char *_unique_name;
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Genode::Dataspace_capability _elf_ds;
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Genode::Dataspace_capability _ldso_ds;
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Rpc_entrypoint _entrypoint;
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Service_registry *_parent_services;
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Service_registry _local_services;
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Genode::Rpc_entrypoint *_root_ep;
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Init::Child_config _child_config;
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Init::Child_policy_provide_rom_file _binary_policy;
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Init::Child_policy_provide_rom_file _config_policy;
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Genode_child_resources _genode_child_resources;
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Signal_dispatcher<App_child> _unresolved_page_fault_dispatcher;
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Dataspace_pool _managed_ds_map;
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Pd_session_component _pd {_unique_name, _entrypoint, _managed_ds_map};
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Cpu_root _cpu_root;
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Cpu_session_client _cpu_session;
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Ram_session_client _ram_session;
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Region_map_client _address_space { _pd.address_space() };
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Child::Initial_thread _initial_thread;
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Parent_service _parent_pd_service { "" };
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Parent_service _parent_ram_service { "" };
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Parent_service _parent_cpu_service { "" };
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Child *_child;
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Rom_service _rom_service;
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Cpu_session_capability _get_cpu_session_cap()
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{
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_entrypoint.manage(&_cpu_root);
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char args[64];
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Genode::snprintf(args, sizeof(args), "ram_quota=64K, label=\"%s\"", _unique_name);
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return static_cap_cast<Cpu_session>(_cpu_root.session(args, Affinity()));
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}
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/**
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* Proxy for a service provided by the child
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*/
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class Child_service_root : public Genode::Rpc_object<Genode::Root>
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{
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private:
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/**
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* Root interface of the real service, provided by the child
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*/
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Genode::Root_client _child_root;
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/**
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* Child's RAM session used for quota transfers
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*/
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Genode::Ram_session_capability _child_ram;
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struct Child_session;
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typedef Genode::Object_pool<Child_session> Session_pool;
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/**
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* Per-session meta data
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*
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* For each session, we need to keep track of the quota
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* attached to it - in order to revert the quota donation
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* when the session gets closed.
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*/
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struct Child_session : public Session_pool::Entry
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{
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Genode::size_t ram_quota;
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Child_session(Genode::Session_capability cap,
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Genode::size_t ram_quota)
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: Session_pool::Entry(cap), ram_quota(ram_quota) { }
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};
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/**
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* Data base containing per-session meta data
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*/
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Session_pool _sessions;
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public:
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/**
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* Constructor
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*/
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Child_service_root(Genode::Ram_session_capability child_ram,
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Genode::Root_capability child_root)
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: _child_root(child_root), _child_ram(child_ram)
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{ }
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/********************
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** Root interface **
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********************/
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Session_capability session(Session_args const &args,
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Affinity const &affinity)
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{
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using namespace Genode;
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Genode::size_t ram_quota =
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Arg_string::find_arg(args.string(),
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"ram_quota").ulong_value(0);
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/* forward session quota to child */
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env()->ram_session()->transfer_quota(_child_ram, ram_quota);
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Session_capability cap = _child_root.session(args, affinity);
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/*
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* Keep information about donated quota in '_sessions'
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* data base.
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*/
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_sessions.insert(new (env()->heap())
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Child_session(cap, ram_quota));
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return cap;
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}
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void upgrade(Session_capability session_cap,
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Upgrade_args const &args)
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{
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using namespace Genode;
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auto lambda = [&] (Child_session *session) {
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if (!session) {
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PERR("attempt to upgrade unknown session");
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return;
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}
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Genode::size_t ram_quota =
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Arg_string::find_arg(args.string(),
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"ram_quota").ulong_value(0);
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/* forward session quota to child */
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env()->ram_session()->transfer_quota(_child_ram, ram_quota);
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session->ram_quota += ram_quota;
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/* inform child about quota upgrade */
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_child_root.upgrade(session_cap, args);
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};
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_sessions.apply(session_cap, lambda);
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}
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void close(Session_capability session_cap)
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{
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using namespace Genode;
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Child_session *session;
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auto lambda = [&] (Child_session *s) {
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session = s;
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if (!session) {
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PERR("attempt to close unknown session");
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return;
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}
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_sessions.remove(session);
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};
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_sessions.apply(session_cap, lambda);
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Genode::size_t ram_quota = session->ram_quota;
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destroy(env()->heap(), session);
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_child_root.close(session_cap);
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/*
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* The child is expected to free enough quota to revert
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* the quota donation.
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*/
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Ram_session_client child_ram(_child_ram);
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child_ram.transfer_quota(env()->ram_session_cap(), ram_quota);
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}
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};
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void _dispatch_unresolved_page_fault(unsigned)
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{
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_genode_child_resources.cpu_session_component()->handle_unresolved_page_fault();
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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 root_ep entrypoint serving the root interfaces of the
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* services provided by the child and announced
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* towards the parent of GDB monitor
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*/
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App_child(const char *unique_name,
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Genode::Dataspace_capability elf_ds,
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Genode::Dataspace_capability ldso_ds,
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Genode::Ram_session_capability ram_session,
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Genode::Cap_session *cap_session,
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Service_registry *parent_services,
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Genode::Rpc_entrypoint *root_ep,
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Signal_receiver *signal_receiver,
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Xml_node target_node)
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: Init::Child_policy_enforce_labeling(unique_name),
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_unique_name(unique_name),
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_elf_ds(elf_ds),
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_ldso_ds(ldso_ds),
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_entrypoint(cap_session, STACK_SIZE, "GDB monitor entrypoint name"),
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_parent_services(parent_services),
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_root_ep(root_ep),
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_child_config(ram_session, target_node),
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_binary_policy("binary", elf_ds, &_entrypoint),
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_config_policy("config", _child_config.dataspace(), &_entrypoint),
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_unresolved_page_fault_dispatcher(*signal_receiver,
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*this,
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&App_child::_dispatch_unresolved_page_fault),
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_cpu_root(&_entrypoint, &_entrypoint, env()->heap(), _pd.core_pd_cap(),
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signal_receiver, &_genode_child_resources),
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_cpu_session(_get_cpu_session_cap()),
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_ram_session(ram_session),
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_initial_thread(_cpu_session, _pd.cap(), unique_name),
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_rom_service(&_entrypoint, env()->heap())
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{
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_genode_child_resources.region_map_component(&_pd.region_map());
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_pd.region_map().fault_handler(_unresolved_page_fault_dispatcher);
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_local_services.insert(&_rom_service);
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}
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~App_child()
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{
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destroy(env()->heap(), _child);
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}
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Genode_child_resources *genode_child_resources()
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{
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return &_genode_child_resources;
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}
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void start()
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{
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_child = new (env()->heap()) Child(_elf_ds,
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_ldso_ds,
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_pd.cap(),
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_pd,
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_ram_session,
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_ram_session,
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_cpu_session,
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_initial_thread,
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*Genode::env()->rm_session(),
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_address_space,
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_entrypoint,
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*this);
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}
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/****************************
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** Child-policy interface **
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****************************/
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const char *name() const { return _unique_name; }
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void filter_session_args(const char *, char *args, Genode::size_t args_len)
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{
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Init::Child_policy_enforce_labeling::filter_session_args(0, args, args_len);
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}
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Service *resolve_session_request(const char *service_name,
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const char *args)
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{
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Service *service = 0;
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/* check for binary file request */
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if ((service = _binary_policy.resolve_session_request(service_name, args)))
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return service;
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/* check for config file request */
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if ((service = _config_policy.resolve_session_request(service_name, args)))
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return service;
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service = _local_services.find(service_name);
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if (service)
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return service;
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service = _parent_services->find(service_name);
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if (!service) {
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service = new (env()->heap()) Parent_service(service_name);
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_parent_services->insert(service);
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}
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return service;
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}
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bool announce_service(const char *name,
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Root_capability root,
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Allocator *alloc,
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Server *server)
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{
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/* create and announce proxy for the child's root interface */
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Child_service_root *r = new (alloc)
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Child_service_root(_ram_session, root);
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Genode::env()->parent()->announce(name, _root_ep->manage(r));
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return true;
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}
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};
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#endif /* _APP_CHILD_H_ */
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