libnativeloader/open_system_library.cpp

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "nativeloader_test"

#include <dlfcn.h>
#include <log/log.h>

#ifdef ART_TARGET_ANDROID
#include "nativeloader/dlext_namespaces.h"
#endif

namespace android {

extern "C" {

// TODO(b/268440756): Find a way to reuse it from libnativebridge.
void* OpenSystemLibrary(const char* path, int flags) {
#ifdef ART_TARGET_ANDROID
  // The system namespace is called "default" for binaries in /system and
  // "system" for those in the Runtime APEX. Try "system" first since
  // "default" always exists.
  // TODO(b/185587109): Get rid of this error prone logic.
  android_namespace_t* system_ns = android_get_exported_namespace("system");
  if (system_ns == nullptr) {
    system_ns = android_get_exported_namespace("default");
    const char* message = "Failed to get system namespace for loading %s";
    LOG_ALWAYS_FATAL_IF(system_ns == nullptr, message, path);
  }
  const android_dlextinfo dlextinfo = {
      .flags = ANDROID_DLEXT_USE_NAMESPACE,
      .library_namespace = system_ns,
  };
  return android_dlopen_ext(path, flags, &dlextinfo);
#else
  return dlopen(path, flags);
#endif
}

}  // extern "C"

}  // namespace android