98 lines
1.8 KiB
C++
98 lines
1.8 KiB
C++
/*
|
|
* \brief Access to process configuration
|
|
* \author Norman Feske
|
|
* \date 2010-05-04
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2010-2013 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.
|
|
*/
|
|
|
|
#include <os/config.h>
|
|
|
|
using namespace Genode;
|
|
|
|
Xml_node _config_xml_node(Dataspace_capability config_ds)
|
|
{
|
|
return Xml_node(env()->rm_session()->attach(config_ds),
|
|
Genode::Dataspace_client(config_ds).size());
|
|
}
|
|
|
|
|
|
/**
|
|
* Fallback XML node used if the configuration is broken
|
|
*/
|
|
static Xml_node fallback_config_xml()
|
|
{
|
|
return Xml_node("<config/>");
|
|
}
|
|
|
|
|
|
void Config::reload()
|
|
{
|
|
if (!this)
|
|
return;
|
|
|
|
try {
|
|
/* re-acquire dataspace from ROM session */
|
|
if (_config_ds.valid())
|
|
env()->rm_session()->detach(_config_xml.addr());
|
|
|
|
_config_ds = _config_rom.dataspace();
|
|
|
|
/* re-initialize XML node with new config data */
|
|
_config_xml = _config_xml_node(_config_ds);
|
|
|
|
} catch (Genode::Xml_node::Invalid_syntax) {
|
|
PERR("Config file has invalid syntax");
|
|
_config_xml = fallback_config_xml();
|
|
}
|
|
}
|
|
|
|
|
|
Xml_node Config::xml_node()
|
|
{
|
|
if (!this)
|
|
return fallback_config_xml();
|
|
|
|
return _config_xml;
|
|
}
|
|
|
|
|
|
void Config::sigh(Signal_context_capability cap)
|
|
{
|
|
if (this)
|
|
_config_rom.sigh(cap);
|
|
}
|
|
|
|
|
|
Config::Config()
|
|
:
|
|
_config_rom("config"),
|
|
_config_ds(_config_rom.dataspace()),
|
|
_config_xml(_config_xml_node(_config_ds))
|
|
{ }
|
|
|
|
|
|
Config *Genode::config()
|
|
{
|
|
static bool config_failed = false;
|
|
if (!config_failed) {
|
|
try {
|
|
static Config config_inst;
|
|
return &config_inst;
|
|
} catch (Genode::Rom_connection::Rom_connection_failed) {
|
|
PERR("Could not obtain config file");
|
|
} catch (Genode::Xml_node::Invalid_syntax) {
|
|
PERR("Config file has invalid syntax");
|
|
}
|
|
}
|
|
/* do not try again to construct 'config_inst' */
|
|
config_failed = true;
|
|
return 0;
|
|
}
|
|
|