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add dlerror for plugin loading

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This commit is contained in:
Mathis Logemann 2022-03-15 21:07:02 +01:00
parent 4493a06878
commit 5ee7571761
1 changed files with 20 additions and 9 deletions
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25
src/plugin.cpp
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@ -48,10 +48,12 @@ namespace mapnik {
struct _mapnik_lib_t
{
std::string name;
std::string error_str;
handle dl;
_mapnik_lib_t()
: name{"unknown"}
, dl{0}
, error_str{""}
, dl{nullptr}
{}
~_mapnik_lib_t()
{
@ -73,7 +75,7 @@ struct _mapnik_lib_t
{
#ifndef MAPNIK_NO_DLCLOSE
dlclose(dl);
dl = 0;
dl = nullptr;
#endif
}
#endif
@ -84,25 +86,34 @@ PluginInfo::PluginInfo(std::string const& filename, std::string const& library_n
: filename_(filename)
, module_{std::make_unique<mapnik_lib_t>()}
{
assert(module_ != nullptr);
#if defined(_WIN32)
if (module_)
module_->dl = LoadLibraryA(filename.c_str());
#elif defined(MAPNIK_HAS_DLCFN)
if (module_)
module_->dl = dlopen(filename.c_str(), RTLD_LAZY);
#else
throw std::runtime_error("no support for loading dynamic objects (Mapnik not compiled with -DMAPNIK_HAS_DLCFN)");
#endif
#if defined(MAPNIK_HAS_DLCFN) || defined(_WIN32)
if (module_ && module_->dl)
if (module_->dl)
{
datasource_plugin* plugin{reinterpret_cast<datasource_plugin*>(get_symbol("plugin"))};
if (!plugin)
throw std::runtime_error("plugin has a false interface"); //! todo: better error text
module_->name = plugin->name();
module_->error_str = "";
plugin->after_load();
}
else
{
const auto errcode = dlerror();
#ifdef _WIN32
module_->error_str = std::system_category().message(errcode);
#else
module_->error_str = errcode ? errcode : "";
#endif
}
#endif // defined(MAPNIK_HAS_DLCFN) || defined(_WIN32)
}
PluginInfo::~PluginInfo() {}
@ -124,7 +135,7 @@ std::string const& PluginInfo::name() const
bool PluginInfo::valid() const
{
#ifdef MAPNIK_SUPPORTS_DLOPEN
if (module_ && module_->dl && !module_->name.empty())
if (module_->dl && !module_->name.empty())
return true;
#endif
return false;
@ -132,7 +143,7 @@ bool PluginInfo::valid() const
std::string PluginInfo::get_error() const
{
return std::string("could not open: '") + module_->name + "'";
return std::string{"could not open: '"} + module_->name + "'. Error: " + module_->error_str;
}
void PluginInfo::init()