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/utf_string_conversions.h"
  12 #include "base/threading/thread_restrictions.h"
  13
  14 namespace base {
  15
  16 std::string NativeLibraryLoadError::ToString() const {
  17   return message;
  18 }
  19
  20 // static
  21 NativeLibrary LoadNativeLibrary(const FilePath& library_path,
  22                                 NativeLibraryLoadError* error) {
  23   // dlopen() opens the file off disk.
  24   base::ThreadRestrictions::AssertIOAllowed();
  25
  26   // We deliberately do not use RTLD_DEEPBIND.  For the history why, please
  27   // refer to the bug tracker.  Some useful bug reports to read include:
  28   // http://crbug.com/17943, http://crbug.com/17557, http://crbug.com/36892,
  29   // and http://crbug.com/40794.
  30   void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
  31   if (!dl && error)
  32     error->message = dlerror();
  33
  34   return dl;
  35 }
  36
  37 // static
  38 void UnloadNativeLibrary(NativeLibrary library) {
  39   int ret = dlclose(library);
  40   if (ret < 0) {
  41     DLOG(ERROR) << "dlclose failed: " << dlerror();
  42     NOTREACHED();
  43   }
  44 }
  45
  46 // static
  47 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
  48                                           const char* name) {
  49   return dlsym(library, name);
  50 }
  51
  52 // static
  53 string16 GetNativeLibraryName(const string16& name) {
  54   return ASCIIToUTF16("lib") + name + ASCIIToUTF16(".so");
  55 }
  56
  57 }  // namespace base