ClickHouse/src/Common/SharedLibrary.cpp
2020-04-22 03:29:38 +03:00

50 lines
1.1 KiB
C++

#include "SharedLibrary.h"
#include <string>
#include <boost/core/noncopyable.hpp>
#include <common/phdr_cache.h>
#include "Exception.h"
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_DLOPEN;
extern const int CANNOT_DLSYM;
}
SharedLibrary::SharedLibrary(const std::string & path, int flags)
{
handle = dlopen(path.c_str(), flags);
if (!handle)
throw Exception(std::string("Cannot dlopen: ") + dlerror(), ErrorCodes::CANNOT_DLOPEN);
updatePHDRCache();
/// NOTE: race condition exists when loading multiple shared libraries concurrently.
/// We don't care (or add global mutex for this method).
}
SharedLibrary::~SharedLibrary()
{
if (handle && dlclose(handle))
std::terminate();
}
void * SharedLibrary::getImpl(const std::string & name, bool no_throw)
{
dlerror();
auto * res = dlsym(handle, name.c_str());
if (char * error = dlerror())
{
if (no_throw)
return nullptr;
throw Exception(std::string("Cannot dlsym: ") + error, ErrorCodes::CANNOT_DLSYM);
}
return res;
}
}