359 lines
8.3 KiB
C++
359 lines
8.3 KiB
C++
/*
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* \brief Noux child process
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* \author Norman Feske
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* \date 2011-02-17
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*/
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/*
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* Copyright (C) 2011-2012 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 _NOUX__CHILD_H_
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#define _NOUX__CHILD_H_
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/* Genode includes */
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#include <base/signal.h>
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#include <base/semaphore.h>
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#include <cap_session/cap_session.h>
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#include <os/attached_ram_dataspace.h>
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/* Noux includes */
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#include <file_descriptor_registry.h>
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#include <vfs.h>
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#include <signal_dispatcher.h>
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#include <noux_session/capability.h>
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#include <args.h>
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#include <environment.h>
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#include <ram_session_component.h>
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#include <cpu_session_component.h>
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#include <child_policy.h>
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namespace Noux {
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using namespace Genode;
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/**
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* Allocator for process IDs
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*/
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class Pid_allocator
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{
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private:
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Lock _lock;
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int _num_pids;
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public:
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Pid_allocator() : _num_pids(0) { }
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int alloc()
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{
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Lock::Guard guard(_lock);
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return _num_pids++;
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}
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};
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/**
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* Return singleton instance of PID allocator
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*/
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Pid_allocator *pid_allocator();
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class Child;
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bool is_init_process(Child *child);
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void init_process_exited();
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/**
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* Signal context used for child exit
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*/
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class Child_exit_dispatcher : public Signal_dispatcher
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{
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private:
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Child *_child;
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public:
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Child_exit_dispatcher(Child *child) : _child(child) { }
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void dispatch()
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{
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if (is_init_process(_child)) {
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PINF("init process exited");
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/* trigger exit of main event loop */
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init_process_exited();
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} else {
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/* destroy 'Noux::Child' */
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destroy(Genode::env()->heap(), _child);
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PINF("destroy %p", _child);
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PINF("quota: avail=%zd, used=%zd",
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Genode::env()->ram_session()->avail(),
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Genode::env()->ram_session()->used());
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}
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}
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};
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/**
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* Signal context used for removing the child after having executed 'execve'
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*/
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class Child_execve_cleanup_dispatcher : public Signal_dispatcher
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{
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private:
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Child *_child;
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public:
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Child_execve_cleanup_dispatcher(Child *child) : _child(child) { }
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void dispatch()
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{
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destroy(env()->heap(), _child);
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}
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};
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class Child : public Rpc_object<Session>,
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public File_descriptor_registry,
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public Family_member
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{
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private:
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Signal_receiver *_sig_rec;
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/**
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* Semaphore used for implementing blocking syscalls, i.e., select
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*/
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Semaphore _blocker;
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Child_exit_dispatcher _exit_dispatcher;
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Signal_context_capability _exit_context_cap;
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Child_execve_cleanup_dispatcher _execve_cleanup_dispatcher;
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Signal_context_capability _execve_cleanup_context_cap;
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Cap_session * const _cap_session;
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enum { STACK_SIZE = 4*1024*sizeof(long) };
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Rpc_entrypoint _entrypoint;
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/**
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* Resources assigned to the child
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*/
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struct Resources
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{
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/**
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* Entrypoint used to serve the RPC interfaces of the
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* locally-provided services
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*/
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Rpc_entrypoint &ep;
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/**
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* Registry of dataspaces owned by the Noux process
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*/
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Dataspace_registry ds_registry;
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/**
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* Locally-provided services for accessing platform resources
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*/
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Ram_session_component ram;
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Cpu_session_component cpu;
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Rm_session_component rm;
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Resources(char const *label, Rpc_entrypoint &ep, bool forked)
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:
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ep(ep), ram(ds_registry), cpu(label, forked), rm(ds_registry)
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{
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ep.manage(&ram);
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ep.manage(&rm);
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ep.manage(&cpu);
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}
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~Resources()
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{
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ep.dissolve(&ram);
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ep.dissolve(&rm);
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ep.dissolve(&cpu);
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}
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} _resources;
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/**
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* Command line arguments
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*/
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Args_dataspace _args;
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/**
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* Environment variables
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*/
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Environment _env;
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Vfs * const _vfs;
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/**
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* ELF binary
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*/
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Dataspace_capability const _binary_ds;
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enum { PAGE_SIZE = 4096, PAGE_MASK = ~(PAGE_SIZE - 1) };
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enum { SYSIO_DS_SIZE = PAGE_MASK & (sizeof(Sysio) + PAGE_SIZE - 1) };
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Attached_ram_dataspace _sysio_ds;
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Sysio * const _sysio;
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Session_capability const _noux_session_cap;
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Local_noux_service _local_noux_service;
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Local_rm_service _local_rm_service;
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Service_registry &_parent_services;
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Child_policy _child_policy;
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Genode::Child _child;
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/**
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* Exception type for failed file-descriptor lookup
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*/
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class Invalid_fd { };
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Shared_pointer<Io_channel> _lookup_channel(int fd) const
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{
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Shared_pointer<Io_channel> channel = io_channel_by_fd(fd);
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if (channel)
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return channel;
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throw Invalid_fd();
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}
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enum { ARGS_DS_SIZE = 4096 };
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/**
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* Let specified child inherit our file descriptors
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*/
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void _assign_io_channels_to(Child *child)
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{
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for (int fd = 0; fd < MAX_FILE_DESCRIPTORS; fd++)
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if (fd_in_use(fd))
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child->add_io_channel(io_channel_by_fd(fd), fd);
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}
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void _block_for_io_channel(Shared_pointer<Io_channel> &io)
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{
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Wake_up_notifier notifier(&_blocker);
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io->register_wake_up_notifier(¬ifier);
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_blocker.down();
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io->unregister_wake_up_notifier(¬ifier);
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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 forked false if the child is spawned directly from
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* an executable binary (i.e., the init process,
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* or children created via execve, or
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* true if the child is a fork from another child
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*/
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Child(char const *name,
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Family_member *parent,
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int pid,
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Signal_receiver *sig_rec,
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Vfs *vfs,
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Args const &args,
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char const *env,
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char const *pwd,
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Cap_session *cap_session,
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Service_registry &parent_services,
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Rpc_entrypoint &resources_ep,
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bool forked)
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:
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Family_member(pid, parent),
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_sig_rec(sig_rec),
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_exit_dispatcher(this),
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_exit_context_cap(sig_rec->manage(&_exit_dispatcher)),
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_execve_cleanup_dispatcher(this),
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_execve_cleanup_context_cap(sig_rec->manage(&_execve_cleanup_dispatcher)),
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_cap_session(cap_session),
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_entrypoint(cap_session, STACK_SIZE, "noux_process", false),
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_resources(name, resources_ep, false),
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_args(ARGS_DS_SIZE, args),
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_env(env),
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_vfs(vfs),
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_binary_ds(forked ? Dataspace_capability()
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: vfs->dataspace_from_file(name)),
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_sysio_ds(Genode::env()->ram_session(), SYSIO_DS_SIZE),
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_sysio(_sysio_ds.local_addr<Sysio>()),
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_noux_session_cap(Session_capability(_entrypoint.manage(this))),
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_local_noux_service(_noux_session_cap),
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_local_rm_service(_entrypoint, _resources.ds_registry),
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_parent_services(parent_services),
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_child_policy(name, _binary_ds, _args.cap(), _env.cap(),
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_entrypoint, _local_noux_service,
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_local_rm_service, _parent_services,
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*this, _exit_context_cap, _resources.ram),
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_child(_binary_ds, _resources.ram.cap(), _resources.cpu.cap(),
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_resources.rm.cap(), &_entrypoint, &_child_policy)
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{
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_env.pwd(pwd);
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_args.dump();
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}
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~Child()
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{
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_sig_rec->dissolve(&_execve_cleanup_dispatcher);
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_sig_rec->dissolve(&_exit_dispatcher);
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_entrypoint.dissolve(this);
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_vfs->release_dataspace_for_file(_child_policy.name(), _binary_ds);
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}
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void start() { _entrypoint.activate(); }
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void start_forked_main_thread(addr_t ip, addr_t sp, addr_t parent_cap_addr)
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{
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/* poke parent_cap_addr into child's address space */
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Capability<Parent> const &cap = _child.parent_cap();
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Capability<Parent>::Raw raw = { cap.dst(), cap.local_name() };
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_resources.rm.poke(parent_cap_addr, &raw, sizeof(raw));
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/* start execution of new main thread at supplied trampoline */
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_resources.cpu.start_main_thread(ip, sp);
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}
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void submit_exit_signal()
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{
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Signal_transmitter(_exit_context_cap).submit();
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}
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Ram_session_capability ram() const { return _resources.ram.cap(); }
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Rm_session_capability rm() const { return _resources.rm.cap(); }
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Dataspace_registry &ds_registry() { return _resources.ds_registry; }
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/****************************
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** Noux session interface **
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****************************/
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Dataspace_capability sysio_dataspace()
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{
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return _sysio_ds.cap();
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}
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bool syscall(Syscall sc);
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};
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};
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#endif /* _NOUX__CHILD_H_ */
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