text: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "base/native_library.h"
  
  #include <dlfcn.h>
  
  #include "base/files/file_path.h"
  #include "base/logging.h"
  #include "base/strings/string_util.h"
  #include "base/strings/utf_string_conversions.h"
  #include "base/threading/thread_restrictions.h"
  
  namespace base {
  
  std::string NativeLibraryLoadError::ToString() const {
    return message;
  }
  
  // static
  NativeLibrary LoadNativeLibrary(const FilePath& library_path,
                                  NativeLibraryLoadError* error) {
    // dlopen() opens the file off disk.
    ThreadRestrictions::AssertIOAllowed();
  
    // We deliberately do not use RTLD_DEEPBIND.  For the history why, please
    // refer to the bug tracker.  Some useful bug reports to read include:
    // http://crbug.com/17943, http://crbug.com/17557, http://crbug.com/36892,
    // and http://crbug.com/40794.
    void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
    if (!dl && error)
      error->message = dlerror();
  
    return dl;
  }
  
  // static
  void UnloadNativeLibrary(NativeLibrary library) {
    int ret = dlclose(library);
    if (ret < 0) {
      DLOG(ERROR) << "dlclose failed: " << dlerror();
      NOTREACHED();
    }
  }
  
  // static
  void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
                                            StringPiece name) {
    return dlsym(library, name.data());
  }
  
  // static
  std::string GetNativeLibraryName(StringPiece name) {
    DCHECK(IsStringASCII(name));
    return "lib" + name.as_string() + ".so";
  }
  
  }  // namespace base
  