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.
35using namespace webrtc;
36
37namespace webrtc_adm_linux {
38
39inline 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
52DllHandle 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
65void 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
76static 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.
100bool 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