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 "webrtc/modules/audio_device/linux/latebindingsymboltable_linux.h"
12
13 #ifdef WEBRTC_LINUX
14 #include <dlfcn.h>
15 #endif
16
17 // TODO(grunell): Either put inside webrtc namespace or use webrtc:: instead.
18 using namespace webrtc;
19
20 namespace webrtc_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 WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, -1,
43 "Can't load %s : %s", dll_name, GetDllError());
44 }
45 return handle;
46 }
47
InternalUnloadDll(DllHandle handle)48 void InternalUnloadDll(DllHandle handle) {
49 #ifdef WEBRTC_LINUX
50 // TODO(pbos): Remove this dlclose() exclusion when leaks and suppressions from
51 // here are gone (or AddressSanitizer can display them properly).
52 //
53 // Skip dlclose() on AddressSanitizer as leaks including this module in the
54 // stack trace gets displayed as <unknown module> instead of the actual library
55 // -> it can not be suppressed.
56 // https://code.google.com/p/address-sanitizer/issues/detail?id=89
57 #if !defined(ADDRESS_SANITIZER)
58 if (dlclose(handle) != 0) {
59 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
60 "%s", GetDllError());
61 }
62 #endif // !defined(ADDRESS_SANITIZER)
63 #else
64 #error Not implemented
65 #endif
66 }
67
LoadSymbol(DllHandle handle,const char * symbol_name,void ** symbol)68 static bool LoadSymbol(DllHandle handle,
69 const char *symbol_name,
70 void **symbol) {
71 #ifdef WEBRTC_LINUX
72 *symbol = dlsym(handle, symbol_name);
73 char *err = dlerror();
74 if (err) {
75 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
76 "Error loading symbol %s : %d", symbol_name, err);
77 return false;
78 } else if (!*symbol) {
79 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
80 "Symbol %s is NULL", symbol_name);
81 return false;
82 }
83 return true;
84 #else
85 #error Not implemented
86 #endif
87 }
88
89 // This routine MUST assign SOME value for every symbol, even if that value is
90 // NULL, or else some symbols may be left with uninitialized data that the
91 // caller may later interpret as a valid address.
InternalLoadSymbols(DllHandle handle,int num_symbols,const char * const symbol_names[],void * symbols[])92 bool InternalLoadSymbols(DllHandle handle,
93 int num_symbols,
94 const char *const symbol_names[],
95 void *symbols[]) {
96 #ifdef WEBRTC_LINUX
97 // Clear any old errors.
98 dlerror();
99 #endif
100 for (int i = 0; i < num_symbols; ++i) {
101 if (!LoadSymbol(handle, symbol_names[i], &symbols[i])) {
102 return false;
103 }
104 }
105 return true;
106 }
107
108 } // namespace webrtc_adm_linux
109