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