120 lines
2.7 KiB
C++
120 lines
2.7 KiB
C++
/*
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* \brief Pseudo launcher for the Genode version of Scout
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* \author Norman Feske
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* \date 2006-08-28
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*/
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/*
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* Copyright (C) 2006-2013 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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#include <base/env.h>
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#include <launchpad/launchpad.h>
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#include <dataspace/capability.h>
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#include <rom_session/connection.h>
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#include <base/snprintf.h>
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#include "elements.h"
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using namespace Genode;
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using namespace Scout;
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/* initialized by 'Launcher::init' */
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static Launchpad *_launchpad_ptr;
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static Allocator *_alloc_ptr;
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static Env *_env_ptr;
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/**********************************************
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** Registry containing child configurations **
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**********************************************/
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/**
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* The registry contains config dataspaces for given program names. It is
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* filled lazily as a side effect of 'Launcher::launch()'.
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*/
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class Config_registry
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{
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private:
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struct Entry;
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List<Entry> _configs;
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public:
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/**
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* Obtain configuration for specified program name from ROM module
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* named '<prg_name>.config'
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*/
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Dataspace_capability config(char const *name);
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};
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struct Config_registry::Entry : List<Config_registry::Entry>::Element
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{
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Dataspace_capability _init_dataspace(char const *name)
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{
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char buf[256];
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snprintf(buf, sizeof(buf), "%s.config", name);
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Rom_connection *config = 0;
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try {
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config = new (*_alloc_ptr) Rom_connection(*_env_ptr, buf);
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return config->dataspace();
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}
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catch (...) { }
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return Dataspace_capability();
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}
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Dataspace_capability const dataspace;
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char name[128];
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Entry(char const *prg_name) : dataspace(_init_dataspace(prg_name))
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{
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strncpy(name, prg_name, sizeof(name));
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}
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};
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Dataspace_capability Config_registry::config(char const *name)
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{
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/* lookup existing configuration */
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for (Entry *e = _configs.first(); e; e = e->next())
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if (strcmp(name, e->name) == 0)
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return e->dataspace;
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/* if lookup failed, create and register new config */
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Entry *entry = new (*_alloc_ptr) Entry(name);
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_configs.insert(entry);
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return entry->dataspace;
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}
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/************************
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** Launcher interface **
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************************/
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void Launcher::init(Genode::Env &env, Allocator &alloc)
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{
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static Launchpad launchpad(env, env.ram().avail());
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_launchpad_ptr = &launchpad;
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_alloc_ptr = &alloc;
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_env_ptr = &env;
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}
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void Launcher::launch()
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{
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static Config_registry config_registry;
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if (!_launchpad_ptr) {
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class Missing_launchpad_init_call { };
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throw Missing_launchpad_init_call();
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}
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_launchpad_ptr->start_child(prg_name(), quota(),
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config_registry.config(prg_name().string()));
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}
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