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Make 'config()' convenience utility more robust

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This patch improves the config handling by falling back to a static
string (empty "<config />") if no valid config ROM module could be
found. This can happen initially, but also at runtime when the ROM
module dissapears, e.g., a ROM module accessed via fs_rom where the
corresponding file gets unlinked.
This commit is contained in:
Norman Feske 2013-01-14 12:12:36 +01:00
parent 1aa9f9910c
commit fe734272bc
1 changed files with 14 additions and 5 deletions
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19
os/include/os/config.h
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@ -29,6 +29,15 @@ namespace Genode {
Dataspace_capability _config_ds;
Xml_node _config_xml;
Xml_node _config_xml_node()
{
if (_config_ds.valid())
return Xml_node(env()->rm_session()->attach(_config_ds),
Genode::Dataspace_client(_config_ds).size());
else
return Xml_node("<config/>");
}
public:
/**
@ -42,8 +51,7 @@ namespace Genode {
Config() :
_config_rom("config"),
_config_ds(_config_rom.dataspace()),
_config_xml(env()->rm_session()->attach(_config_ds),
Genode::Dataspace_client(_config_ds).size())
_config_xml(_config_xml_node())
{ }
Xml_node xml_node() { return _config_xml; }
@ -65,12 +73,13 @@ namespace Genode {
{
try {
/* re-acquire dataspace from ROM session */
env()->rm_session()->detach(_config_xml.addr());
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 = Xml_node(env()->rm_session()->attach(_config_ds),
Genode::Dataspace_client(_config_ds).size());
_config_xml = _config_xml_node();
} catch (Genode::Xml_node::Invalid_syntax) {
PERR("Config file has invalid syntax");