dlplugin.cpp

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/*
 The Real-Time eXperiment Interface (RTXI)
 Copyright (C) 2011 Georgia Institute of Technology, University of Utah,
 Will Cornell Medical College

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 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 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program. If not, see <http://www.gnu.org/licenses/>.

*/

#include "dlplugin.hpp"

#include "debug.hpp"

DLL::Loader::~Loader()
{
 this->unloadAll();
}

int DLL::Loader::load(const char* library)
{
 DLL::dll_info dll {std::string(library), nullptr};
 const std::unique_lock<std::mutex> lk(this->m_dll_mutex);
 auto loc_iter =
 std::find(this->loaded_plugins.begin(), this->loaded_plugins.end(), dll);
 if (loc_iter != this->loaded_plugins.end()) {
 return 0;
 }

 void* handle = ::dlopen(library, RTLD_LOCAL | RTLD_NOW);
 if (handle == nullptr) {
 ERROR_MSG("DLL::Loader::load : Unable to load library {}", library);
 // NOLINTNEXTLINE
 ERROR_MSG("dlopen : {}", dlerror());
 return -1;
 }
 dll.handle = handle;
 this->loaded_plugins.push_back(dll);
 return 0;
}

void DLL::Loader::unload(const char* library)
{
 const DLL::dll_info dll {std::string(library), nullptr};
 const std::unique_lock<std::mutex> lk(this->m_dll_mutex);
 auto loc_iter =
 std::find(this->loaded_plugins.begin(), this->loaded_plugins.end(), dll);
 if (loc_iter == this->loaded_plugins.end()) {
 return;
 }
 ::dlclose(loc_iter->handle);
 this->loaded_plugins.erase(loc_iter);
}

void DLL::Loader::unloadAll()
{
 for (auto& dll : this->loaded_plugins) {
 this->unload(dll.library_name.c_str());
 }
}