ClickHouse/src/Common/SharedLibrary.cpp

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#include "SharedLibrary.h"
#include <string>
#include <boost/core/noncopyable.hpp>
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#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);
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updatePHDRCache();
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/// 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();
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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;
}
}