1 /*
2 * libjingle
3 * Copyright 2004--2010, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "webrtc/modules/audio_device/linux/latebindingsymboltable_linux.h"
29
30 #ifdef WEBRTC_LINUX
31 #include <dlfcn.h>
32 #endif
33
34 // TODO(grunell): Either put inside webrtc namespace or use webrtc:: instead.
35 using namespace webrtc;
36
37 namespace webrtc_adm_linux {
38
GetDllError()39 inline static const char *GetDllError() {
40 #ifdef WEBRTC_LINUX
41 char *err = dlerror();
42 if (err) {
43 return err;
44 } else {
45 return "No error";
46 }
47 #else
48 #error Not implemented
49 #endif
50 }
51
InternalLoadDll(const char dll_name[])52 DllHandle InternalLoadDll(const char dll_name[]) {
53 #ifdef WEBRTC_LINUX
54 DllHandle handle = dlopen(dll_name, RTLD_NOW);
55 #else
56 #error Not implemented
57 #endif
58 if (handle == kInvalidDllHandle) {
59 WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, -1,
60 "Can't load %s : %s", dll_name, GetDllError());
61 }
62 return handle;
63 }
64
InternalUnloadDll(DllHandle handle)65 void InternalUnloadDll(DllHandle handle) {
66 #ifdef WEBRTC_LINUX
67 if (dlclose(handle) != 0) {
68 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
69 "%s", GetDllError());
70 }
71 #else
72 #error Not implemented
73 #endif
74 }
75
LoadSymbol(DllHandle handle,const char * symbol_name,void ** symbol)76 static bool LoadSymbol(DllHandle handle,
77 const char *symbol_name,
78 void **symbol) {
79 #ifdef WEBRTC_LINUX
80 *symbol = dlsym(handle, symbol_name);
81 char *err = dlerror();
82 if (err) {
83 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
84 "Error loading symbol %s : %d", symbol_name, err);
85 return false;
86 } else if (!*symbol) {
87 WEBRTC_TRACE(kTraceError, kTraceAudioDevice, -1,
88 "Symbol %s is NULL", symbol_name);
89 return false;
90 }
91 return true;
92 #else
93 #error Not implemented
94 #endif
95 }
96
97 // This routine MUST assign SOME value for every symbol, even if that value is
98 // NULL, or else some symbols may be left with uninitialized data that the
99 // caller may later interpret as a valid address.
InternalLoadSymbols(DllHandle handle,int num_symbols,const char * const symbol_names[],void * symbols[])100 bool InternalLoadSymbols(DllHandle handle,
101 int num_symbols,
102 const char *const symbol_names[],
103 void *symbols[]) {
104 #ifdef WEBRTC_LINUX
105 // Clear any old errors.
106 dlerror();
107 #endif
108 for (int i = 0; i < num_symbols; ++i) {
109 if (!LoadSymbol(handle, symbol_names[i], &symbols[i])) {
110 return false;
111 }
112 }
113 return true;
114 }
115
116 } // namespace webrtc_adm_linux
117