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// 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 LoadNativeLibraryWithOptions(const FilePath& library_path,
const NativeLibraryOptions& options,
NativeLibraryLoadError* error) {
// dlopen() opens the file off disk.
ThreadRestrictions::AssertIOAllowed();
// We deliberately do not use RTLD_DEEPBIND by default. 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.
int flags = RTLD_LAZY;
#if defined(OS_ANDROID) || !defined(RTLD_DEEPBIND)
// Certain platforms don't define RTLD_DEEPBIND. Android dlopen() requires
// further investigation, as it might vary across versions. Crash here to
// warn developers that they're trying to rely on uncertain behavior.
CHECK(!options.prefer_own_symbols);
#else
if (options.prefer_own_symbols)
flags |= RTLD_DEEPBIND;
#endif
void* dl = dlopen(library_path.value().c_str(), flags);
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
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