base/native_library_posix.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/native_library.h"
   6
   7 #include <dlfcn.h>
   8
   9 #include "base/files/file_path.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/threading/scoped_blocking_call.h"
  14
  15 namespace base {
  16
  17 std::string NativeLibraryLoadError::ToString() const {
  18   return message;
  19 }
  20
  21 NativeLibrary LoadNativeLibraryWithOptions(const FilePath& library_path,
  22                                            const NativeLibraryOptions& options,
  23                                            NativeLibraryLoadError* error) {
  24   // dlopen() opens the file off disk.
  25   ScopedBlockingCall scoped_blocking_call(FROM_HERE, BlockingType::MAY_BLOCK);
  26
  27   // We deliberately do not use RTLD_DEEPBIND by default.  For the history why,
  28   // please refer to the bug tracker.  Some useful bug reports to read include:
  29   // http://crbug.com/17943, http://crbug.com/17557, http://crbug.com/36892,
  30   // and http://crbug.com/40794.
  31   int flags = RTLD_LAZY;
  32 #if defined(OS_ANDROID) || !defined(RTLD_DEEPBIND)
  33   // Certain platforms don't define RTLD_DEEPBIND. Android dlopen() requires
  34   // further investigation, as it might vary across versions. Crash here to
  35   // warn developers that they're trying to rely on uncertain behavior.
  36   CHECK(!options.prefer_own_symbols);
  37 #else
  38   if (options.prefer_own_symbols)
  39     flags |= RTLD_DEEPBIND;
  40 #endif
  41   void* dl = dlopen(library_path.value().c_str(), flags);
  42   if (!dl && error)
  43     error->message = dlerror();
  44
  45   return dl;
  46 }
  47
  48 void UnloadNativeLibrary(NativeLibrary library) {
  49   int ret = dlclose(library);
  50   if (ret < 0) {
  51     DLOG(ERROR) << "dlclose failed: " << dlerror();
  52     NOTREACHED();
  53   }
  54 }
  55
  56 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
  57                                           StringPiece name) {
  58   return dlsym(library, name.data());
  59 }
  60
  61 std::string GetNativeLibraryName(StringPiece name) {
  62   DCHECK(IsStringASCII(name));
  63   return "lib" + name.as_string() + ".so";
  64 }
  65
  66 std::string GetLoadableModuleName(StringPiece name) {
  67   return GetNativeLibraryName(name);
  68 }
  69
  70 }  // namespace base