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/thread_restrictions.h"
14
15 namespace base {
16
ToString() const17 std::string NativeLibraryLoadError::ToString() const {
18 return message;
19 }
20
LoadNativeLibraryWithOptions(const FilePath & library_path,const NativeLibraryOptions & options,NativeLibraryLoadError * error)21 NativeLibrary LoadNativeLibraryWithOptions(const FilePath& library_path,
22 const NativeLibraryOptions& options,
23 NativeLibraryLoadError* error) {
24 // dlopen() opens the file off disk.
25 AssertBlockingAllowed();
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
UnloadNativeLibrary(NativeLibrary library)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
GetFunctionPointerFromNativeLibrary(NativeLibrary library,StringPiece name)56 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
57 StringPiece name) {
58 return dlsym(library, name.data());
59 }
60
GetNativeLibraryName(StringPiece name)61 std::string GetNativeLibraryName(StringPiece name) {
62 DCHECK(IsStringASCII(name));
63 return "lib" + name.as_string() + ".so";
64 }
65
GetLoadableModuleName(StringPiece name)66 std::string GetLoadableModuleName(StringPiece name) {
67 return GetNativeLibraryName(name);
68 }
69
70 } // namespace base
71