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/*
* Copyright (c) 2010 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/audio_device/linux/latebindingsymboltable_linux.h"
#include "absl/strings/string_view.h"
#include "rtc_base/logging.h"
#ifdef WEBRTC_LINUX
#include <dlfcn.h>
#endif
namespace webrtc {
namespace adm_linux {
inline static const char* GetDllError() {
#ifdef WEBRTC_LINUX
char* err = dlerror();
if (err) {
return err;
} else {
return "No error";
}
#else
#error Not implemented
#endif
}
DllHandle InternalLoadDll(absl::string_view dll_name) {
#ifdef WEBRTC_LINUX
DllHandle handle = dlopen(std::string(dll_name).c_str(), RTLD_NOW);
#else
#error Not implemented
#endif
if (handle == kInvalidDllHandle) {
RTC_LOG(LS_WARNING) << "Can't load " << dll_name << " : " << GetDllError();
}
return handle;
}
void InternalUnloadDll(DllHandle handle) {
#ifdef WEBRTC_LINUX
// TODO(pbos): Remove this dlclose() exclusion when leaks and suppressions from
// here are gone (or AddressSanitizer can display them properly).
//
// Skip dlclose() on AddressSanitizer as leaks including this module in the
// stack trace gets displayed as <unknown module> instead of the actual library
// -> it can not be suppressed.
// https://code.google.com/p/address-sanitizer/issues/detail?id=89
#if !defined(ADDRESS_SANITIZER)
if (dlclose(handle) != 0) {
RTC_LOG(LS_ERROR) << GetDllError();
}
#endif // !defined(ADDRESS_SANITIZER)
#else
#error Not implemented
#endif
}
static bool LoadSymbol(DllHandle handle,
absl::string_view symbol_name,
void** symbol) {
#ifdef WEBRTC_LINUX
*symbol = dlsym(handle, std::string(symbol_name).c_str());
char* err = dlerror();
if (err) {
RTC_LOG(LS_ERROR) << "Error loading symbol " << symbol_name << " : " << err;
return false;
} else if (!*symbol) {
RTC_LOG(LS_ERROR) << "Symbol " << symbol_name << " is NULL";
return false;
}
return true;
#else
#error Not implemented
#endif
}
// This routine MUST assign SOME value for every symbol, even if that value is
// NULL, or else some symbols may be left with uninitialized data that the
// caller may later interpret as a valid address.
bool InternalLoadSymbols(DllHandle handle,
int num_symbols,
const char* const symbol_names[],
void* symbols[]) {
#ifdef WEBRTC_LINUX
// Clear any old errors.
dlerror();
#endif
for (int i = 0; i < num_symbols; ++i) {
if (!LoadSymbol(handle, symbol_names[i], &symbols[i])) {
return false;
}
}
return true;
}
} // namespace adm_linux
} // namespace webrtc
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