303 lines
7.4 KiB
C++
303 lines
7.4 KiB
C++
/*
|
|
* \brief Noux child process
|
|
* \author Norman Feske
|
|
* \date 2011-02-17
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _NOUX__CHILD_H_
|
|
#define _NOUX__CHILD_H_
|
|
|
|
/* Genode includes */
|
|
#include <init/child_policy.h>
|
|
#include <ram_session/connection.h>
|
|
#include <cpu_session/connection.h>
|
|
#include <base/signal.h>
|
|
#include <base/semaphore.h>
|
|
#include <cap_session/cap_session.h>
|
|
#include <os/attached_ram_dataspace.h>
|
|
|
|
/* Noux includes */
|
|
#include <file_descriptor_registry.h>
|
|
#include <vfs.h>
|
|
#include <signal_dispatcher.h>
|
|
#include <noux_session/capability.h>
|
|
#include <args.h>
|
|
#include <environment.h>
|
|
|
|
namespace Noux {
|
|
|
|
class Child;
|
|
|
|
bool is_init_process(Child *child);
|
|
void init_process_exited();
|
|
|
|
|
|
/**
|
|
* Signal context used for child exit
|
|
*/
|
|
class Child_exit_dispatcher : public Signal_dispatcher
|
|
{
|
|
private:
|
|
|
|
Child *_child;
|
|
|
|
public:
|
|
|
|
Child_exit_dispatcher(Child *child) : _child(child) { }
|
|
|
|
void dispatch()
|
|
{
|
|
if (is_init_process(_child)) {
|
|
PINF("init process exited");
|
|
|
|
/* trigger exit of main event loop */
|
|
init_process_exited();
|
|
}
|
|
/* XXX destroy child */
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Signal context used for removing the child after having executed 'execve'
|
|
*/
|
|
class Child_execve_cleanup_dispatcher : public Signal_dispatcher
|
|
{
|
|
private:
|
|
|
|
Child *_child;
|
|
|
|
public:
|
|
|
|
Child_execve_cleanup_dispatcher(Child *child) : _child(child) { }
|
|
|
|
void dispatch()
|
|
{
|
|
PINF("execve cleanup dispatcher called");
|
|
Genode::destroy(Genode::env()->heap(), _child);
|
|
}
|
|
};
|
|
|
|
|
|
class Child : private Genode::Child_policy,
|
|
public Genode::Rpc_object<Session>,
|
|
public File_descriptor_registry
|
|
{
|
|
private:
|
|
|
|
int const _pid;
|
|
|
|
Genode::Signal_receiver *_sig_rec;
|
|
|
|
/**
|
|
* Semaphore used for implementing blocking syscalls, i.e., select
|
|
*/
|
|
Genode::Semaphore _blocker;
|
|
|
|
enum { MAX_NAME_LEN = 64 };
|
|
char _name[MAX_NAME_LEN];
|
|
|
|
Child_exit_dispatcher _exit_dispatcher;
|
|
Genode::Signal_context_capability _exit_context_cap;
|
|
|
|
Child_execve_cleanup_dispatcher _execve_cleanup_dispatcher;
|
|
Genode::Signal_context_capability _execve_cleanup_context_cap;
|
|
|
|
/**
|
|
* Resources assigned to the child
|
|
*/
|
|
struct Resources
|
|
{
|
|
Genode::Ram_connection ram;
|
|
Genode::Cpu_connection cpu;
|
|
Genode::Rm_connection rm;
|
|
|
|
Resources(char const *label) : ram(label), cpu(label)
|
|
{
|
|
ram.ref_account(Genode::env()->ram_session_cap());
|
|
Genode::env()->ram_session()->transfer_quota(ram.cap(), 2*1024*1024);
|
|
}
|
|
} _resources;
|
|
|
|
Genode::Cap_session * const _cap_session;
|
|
|
|
enum { STACK_SIZE = 4*1024*sizeof(long) };
|
|
Genode::Rpc_entrypoint _entrypoint;
|
|
|
|
/**
|
|
* Command line arguments
|
|
*/
|
|
Args_dataspace _args;
|
|
|
|
/**
|
|
* Environment variables
|
|
*/
|
|
Environment _env;
|
|
|
|
Vfs * const _vfs;
|
|
|
|
/**
|
|
* ELF binary
|
|
*/
|
|
Genode::Dataspace_capability const _binary_ds;
|
|
|
|
Genode::Child _child;
|
|
|
|
Genode::Service_registry * const _parent_services;
|
|
|
|
Init::Child_policy_enforce_labeling _labeling_policy;
|
|
Init::Child_policy_provide_rom_file _binary_policy;
|
|
Init::Child_policy_provide_rom_file _args_policy;
|
|
Init::Child_policy_provide_rom_file _env_policy;
|
|
|
|
enum { PAGE_SIZE = 4096, PAGE_MASK = ~(PAGE_SIZE - 1) };
|
|
enum { SYSIO_DS_SIZE = PAGE_MASK & (sizeof(Sysio) + PAGE_SIZE - 1) };
|
|
|
|
Genode::Attached_ram_dataspace _sysio_ds;
|
|
Sysio * const _sysio;
|
|
|
|
Session_capability const _noux_session_cap;
|
|
|
|
struct Local_noux_service : public Genode::Service
|
|
{
|
|
Session_capability _cap;
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* \param cap capability to return on session requests
|
|
*/
|
|
Local_noux_service(Session_capability cap)
|
|
: Genode::Service(service_name()), _cap(cap) { }
|
|
|
|
Genode::Session_capability session(const char *args) { return _cap; }
|
|
void upgrade(Genode::Session_capability, const char *args) { }
|
|
void close(Genode::Session_capability) { }
|
|
|
|
} _local_noux_service;
|
|
|
|
/**
|
|
* Exception type for failed file-descriptor lookup
|
|
*/
|
|
class Invalid_fd { };
|
|
|
|
Shared_pointer<Io_channel> _lookup_channel(int fd) const
|
|
{
|
|
Shared_pointer<Io_channel> channel = io_channel_by_fd(fd);
|
|
|
|
if (channel)
|
|
return channel;
|
|
|
|
throw Invalid_fd();
|
|
}
|
|
|
|
enum { ARGS_DS_SIZE = 4096 };
|
|
|
|
public:
|
|
|
|
Child(char const *name,
|
|
int pid,
|
|
Genode::Signal_receiver *sig_rec,
|
|
Vfs *vfs,
|
|
Args const &args,
|
|
char const *env,
|
|
Genode::Cap_session *cap_session,
|
|
Genode::Service_registry *parent_services)
|
|
:
|
|
_pid(pid),
|
|
_sig_rec(sig_rec),
|
|
_exit_dispatcher(this),
|
|
_exit_context_cap(sig_rec->manage(&_exit_dispatcher)),
|
|
_execve_cleanup_dispatcher(this),
|
|
_execve_cleanup_context_cap(sig_rec->manage(&_execve_cleanup_dispatcher)),
|
|
_resources(name),
|
|
_cap_session(cap_session),
|
|
_entrypoint(cap_session, STACK_SIZE, "noux_process", false),
|
|
_args(ARGS_DS_SIZE, args),
|
|
_env(env),
|
|
_vfs(vfs),
|
|
_binary_ds(vfs->dataspace_from_file(name)),
|
|
_child(_binary_ds, _resources.ram.cap(), _resources.cpu.cap(),
|
|
_resources.rm.cap(), &_entrypoint, this),
|
|
_parent_services(parent_services),
|
|
_labeling_policy(_name),
|
|
_binary_policy("binary", _binary_ds, &_entrypoint),
|
|
_args_policy( "args", _args.cap(), &_entrypoint),
|
|
_env_policy( "env", _env.cap(), &_entrypoint),
|
|
_sysio_ds(Genode::env()->ram_session(), SYSIO_DS_SIZE),
|
|
_sysio(_sysio_ds.local_addr<Sysio>()),
|
|
_noux_session_cap(Session_capability(_entrypoint.manage(this))),
|
|
_local_noux_service(_noux_session_cap)
|
|
{
|
|
_args.dump();
|
|
Genode::strncpy(_name, name, sizeof(_name));
|
|
}
|
|
|
|
~Child()
|
|
{
|
|
/* XXX _binary_ds */
|
|
|
|
_entrypoint.dissolve(this);
|
|
}
|
|
|
|
void start() { _entrypoint.activate(); }
|
|
|
|
/****************************
|
|
** Child_policy interface **
|
|
****************************/
|
|
|
|
const char *name() const { return _name; }
|
|
|
|
Genode::Service *resolve_session_request(const char *service_name,
|
|
const char *args)
|
|
{
|
|
Genode::Service *service = 0;
|
|
|
|
/* check for local ROM file requests */
|
|
if ((service = _args_policy.resolve_session_request(service_name, args))
|
|
|| (service = _env_policy.resolve_session_request(service_name, args))
|
|
|| (service = _binary_policy.resolve_session_request(service_name, args)))
|
|
return service;
|
|
|
|
/* check for locally implemented noux service */
|
|
if (Genode::strcmp(service_name, Session::service_name()) == 0)
|
|
return &_local_noux_service;
|
|
|
|
return _parent_services->find(service_name);
|
|
}
|
|
|
|
void filter_session_args(const char *service,
|
|
char *args, Genode::size_t args_len)
|
|
{
|
|
_labeling_policy.filter_session_args(service, args, args_len);
|
|
}
|
|
|
|
void exit(int exit_value)
|
|
{
|
|
PINF("child %s exited with exit value %d", _name, exit_value);
|
|
Genode::Signal_transmitter(_exit_context_cap).submit();
|
|
}
|
|
|
|
|
|
/****************************
|
|
** Noux session interface **
|
|
****************************/
|
|
|
|
Genode::Dataspace_capability sysio_dataspace()
|
|
{
|
|
return _sysio_ds.cap();
|
|
}
|
|
|
|
bool syscall(Syscall sc);
|
|
};
|
|
};
|
|
|
|
#endif /* _NOUX__CHILD_H_ */
|