ClickHouse/programs/library-bridge/SharedLibrary.cpp

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#include "SharedLibrary.h"
#include <string>
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#include <base/phdr_cache.h>
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#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_DLOPEN;
extern const int CANNOT_DLSYM;
}
SharedLibrary::SharedLibrary(std::string_view path, int flags)
{
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handle = dlopen(path.data(), flags); // NOLINT
if (!handle)
throw Exception(ErrorCodes::CANNOT_DLOPEN, "Cannot dlopen: ({})", dlerror()); // NOLINT(concurrency-mt-unsafe) // MT-Safe on Linux, see man dlerror
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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(std::string_view name, bool no_throw)
{
dlerror(); // NOLINT(concurrency-mt-unsafe) // MT-Safe on Linux, see man dlerror
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auto * res = dlsym(handle, name.data()); // NOLINT
if (char * error = dlerror()) // NOLINT(concurrency-mt-unsafe) // MT-Safe on Linux, see man dlerror
{
if (no_throw)
return nullptr;
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throw Exception(ErrorCodes::CANNOT_DLSYM, "Cannot dlsym: ({})", error);
}
return res;
}
}