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
21 // static
LoadNativeLibrary(const FilePath & library_path,NativeLibraryLoadError * error)22 NativeLibrary LoadNativeLibrary(const FilePath& library_path,
23 NativeLibraryLoadError* error) {
24 // dlopen() opens the file off disk.
25 ThreadRestrictions::AssertIOAllowed();
26
27 // We deliberately do not use RTLD_DEEPBIND. For the history why, please
28 // 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 void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
32 if (!dl && error)
33 error->message = dlerror();
34
35 return dl;
36 }
37
38 // static
UnloadNativeLibrary(NativeLibrary library)39 void UnloadNativeLibrary(NativeLibrary library) {
40 int ret = dlclose(library);
41 if (ret < 0) {
42 DLOG(ERROR) << "dlclose failed: " << dlerror();
43 NOTREACHED();
44 }
45 }
46
47 // static
GetFunctionPointerFromNativeLibrary(NativeLibrary library,StringPiece name)48 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
49 StringPiece name) {
50 return dlsym(library, name.data());
51 }
52
53 // static
GetNativeLibraryName(StringPiece name)54 std::string GetNativeLibraryName(StringPiece name) {
55 DCHECK(IsStringASCII(name));
56 return "lib" + name.as_string() + ".so";
57 }
58
59 } // namespace base
60