379 lines
9.6 KiB
C++
379 lines
9.6 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) 2011-2013 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 _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 <dir_file_system.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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#include <io_receptor_registry.h>
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#include <destruct_queue.h>
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#include <destruct_dispatcher.h>
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#include <local_cpu_service.h>
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#include <local_ram_service.h>
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#include <local_rom_service.h>
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namespace Noux {
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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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/**
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* Return singleton instance of timeout scheduler
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*/
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class Timeout_scheduler;
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Timeout_scheduler *timeout_scheduler();
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/**
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* Return singleton instance of user information
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*/
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class User_info;
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User_info *user_info();
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/**
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* Return singleton instance of Io_receptor_registry
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*/
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Io_receptor_registry *io_receptor_registry();
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/**
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* Return ELF binary of dynamic linker
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*/
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Dataspace_capability ldso_ds_cap();
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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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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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public Destruct_queue::Element<Child>
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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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Allocator *_alloc;
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Destruct_queue &_destruct_queue;
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Destruct_dispatcher _destruct_dispatcher;
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Signal_context_capability _destruct_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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Dir_file_system * const _root_dir;
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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_ram_service _local_ram_service;
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Local_cpu_service _local_cpu_service;
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Local_rm_service _local_rm_service;
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Local_rom_service _local_rom_service;
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Service_registry &_parent_services;
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Static_dataspace_info _binary_ds_info;
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Static_dataspace_info _sysio_ds_info;
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Static_dataspace_info _ldso_ds_info;
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Static_dataspace_info _args_ds_info;
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Static_dataspace_info _env_ds_info;
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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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/**
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* Method for handling noux network related system calls
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*/
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bool _syscall_net(Syscall sc);
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public:
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struct Binary_does_not_exist : Exception { };
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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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* \throw Binary_does_not_exist if child is not a fork and the
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* specified name could not be
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* looked up at the virtual file
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* system
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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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Dir_file_system *root_dir,
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Args const &args,
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Sysio::Env const &env,
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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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Allocator *destruct_alloc,
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Destruct_queue &destruct_queue,
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bool verbose)
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:
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Family_member(pid, parent),
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Destruct_queue::Element<Child>(destruct_alloc),
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_sig_rec(sig_rec),
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_destruct_queue(destruct_queue),
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_destruct_dispatcher(_destruct_queue, this),
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_destruct_context_cap(sig_rec->manage(&_destruct_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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_root_dir(root_dir),
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_binary_ds(root_dir->dataspace(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_ram_service(_entrypoint),
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_local_cpu_service(_entrypoint, _resources.cpu.cpu_cap()),
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_local_rm_service(_entrypoint, _resources.ds_registry),
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_local_rom_service(_entrypoint, _resources.ds_registry),
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_parent_services(parent_services),
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_binary_ds_info(_resources.ds_registry, _binary_ds),
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_sysio_ds_info(_resources.ds_registry, _sysio_ds.cap()),
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_ldso_ds_info(_resources.ds_registry, ldso_ds_cap()),
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_args_ds_info(_resources.ds_registry, _args.cap()),
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_env_ds_info(_resources.ds_registry, _env.cap()),
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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, _local_rom_service,
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_parent_services,
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*this, *this, _destruct_context_cap,
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_resources.ram, verbose),
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_child(forked ? Dataspace_capability() : _binary_ds,
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_resources.ram.cap(), _resources.cpu.cap(),
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_resources.rm.cap(), &_entrypoint, &_child_policy,
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/**
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* Override the implicit assignment to _parent_service
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*/
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_local_ram_service, _local_cpu_service, _local_rm_service)
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{
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if (verbose)
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_args.dump();
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if (!forked && !_binary_ds.valid()) {
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PERR("Lookup of executable \"%s\" failed", name);
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throw Binary_does_not_exist();
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}
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}
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~Child()
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{
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_sig_rec->dissolve(&_destruct_dispatcher);
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_entrypoint.dissolve(this);
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_root_dir->release(_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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if (is_init_process(this)) {
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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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Signal_transmitter(_destruct_context_cap).submit();
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}
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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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