1 /*
2 * Copyright (c) 2010 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "modules/audio_device/linux/latebindingsymboltable_linux.h"
12
13 #include "rtc_base/logging.h"
14
15 #ifdef WEBRTC_LINUX
16 #include <dlfcn.h>
17 #endif
18
19 namespace webrtc {
20 namespace adm_linux {
21
GetDllError()22 inline static const char* GetDllError() {
23 #ifdef WEBRTC_LINUX
24 char* err = dlerror();
25 if (err) {
26 return err;
27 } else {
28 return "No error";
29 }
30 #else
31 #error Not implemented
32 #endif
33 }
34
InternalLoadDll(const char dll_name[])35 DllHandle InternalLoadDll(const char dll_name[]) {
36 #ifdef WEBRTC_LINUX
37 DllHandle handle = dlopen(dll_name, RTLD_NOW);
38 #else
39 #error Not implemented
40 #endif
41 if (handle == kInvalidDllHandle) {
42 RTC_LOG(LS_WARNING) << "Can't load " << dll_name << " : " << GetDllError();
43 }
44 return handle;
45 }
46
InternalUnloadDll(DllHandle handle)47 void InternalUnloadDll(DllHandle handle) {
48 #ifdef WEBRTC_LINUX
49 // TODO(pbos): Remove this dlclose() exclusion when leaks and suppressions from
50 // here are gone (or AddressSanitizer can display them properly).
51 //
52 // Skip dlclose() on AddressSanitizer as leaks including this module in the
53 // stack trace gets displayed as <unknown module> instead of the actual library
54 // -> it can not be suppressed.
55 // https://code.google.com/p/address-sanitizer/issues/detail?id=89
56 #if !defined(ADDRESS_SANITIZER)
57 if (dlclose(handle) != 0) {
58 RTC_LOG(LS_ERROR) << GetDllError();
59 }
60 #endif // !defined(ADDRESS_SANITIZER)
61 #else
62 #error Not implemented
63 #endif
64 }
65
LoadSymbol(DllHandle handle,const char * symbol_name,void ** symbol)66 static bool LoadSymbol(DllHandle handle,
67 const char* symbol_name,
68 void** symbol) {
69 #ifdef WEBRTC_LINUX
70 *symbol = dlsym(handle, symbol_name);
71 char* err = dlerror();
72 if (err) {
73 RTC_LOG(LS_ERROR) << "Error loading symbol " << symbol_name << " : " << err;
74 return false;
75 } else if (!*symbol) {
76 RTC_LOG(LS_ERROR) << "Symbol " << symbol_name << " is NULL";
77 return false;
78 }
79 return true;
80 #else
81 #error Not implemented
82 #endif
83 }
84
85 // This routine MUST assign SOME value for every symbol, even if that value is
86 // NULL, or else some symbols may be left with uninitialized data that the
87 // caller may later interpret as a valid address.
InternalLoadSymbols(DllHandle handle,int num_symbols,const char * const symbol_names[],void * symbols[])88 bool InternalLoadSymbols(DllHandle handle,
89 int num_symbols,
90 const char* const symbol_names[],
91 void* symbols[]) {
92 #ifdef WEBRTC_LINUX
93 // Clear any old errors.
94 dlerror();
95 #endif
96 for (int i = 0; i < num_symbols; ++i) {
97 if (!LoadSymbol(handle, symbol_names[i], &symbols[i])) {
98 return false;
99 }
100 }
101 return true;
102 }
103
104 } // namespace adm_linux
105 } // namespace webrtc
106