tor-browser

The Tor Browser
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latebindingsymboltable_linux.cc (3006B)

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