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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl
#include "mongo/platform/basic.h"
#include "mongo/platform/shared_library.h"
#include <boost/filesystem.hpp>
#include <dlfcn.h>
#include "mongo/stdx/memory.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
SharedLibrary::~SharedLibrary() {
if (_handle) {
if (dlclose(_handle) != 0) {
LOG(2) << "Load Library close failed " << dlerror();
}
}
}
StatusWith<std::unique_ptr<SharedLibrary>> SharedLibrary::create(
const boost::filesystem::path& full_path) {
LOG(1) << "Loading library: " << full_path.c_str();
void* handle = dlopen(full_path.c_str(), RTLD_NOW | RTLD_GLOBAL);
if (handle == nullptr) {
return Status(ErrorCodes::InternalError,
str::stream() << "Load library failed: " << dlerror());
}
return StatusWith<std::unique_ptr<SharedLibrary>>(
std::unique_ptr<SharedLibrary>(new SharedLibrary(handle)));
}
StatusWith<void*> SharedLibrary::getSymbol(StringData name) {
// Clear dlerror() before calling dlsym,
// see man dlerror(3) or dlerror(3p) on any POSIX system for details
// Ignore return
dlerror();
// StringData is not assued to be null-terminated
std::string symbolName = name.toString();
void* symbol = dlsym(_handle, symbolName.c_str());
char* error_msg = dlerror();
if (error_msg != nullptr) {
return StatusWith<void*>(ErrorCodes::InternalError,
str::stream() << "dlsym failed for symbol " << name
<< " with error message: "
<< error_msg);
}
return StatusWith<void*>(symbol);
}
} // namespace mongo
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