1afca73055
This was decided to be done in a separate CL from the move that took place in https://codereview.webrtc.org/1587193006/ BUG=webrtc:5420 NOTRY=True TBR=pthatcher@webrtc.org Review URL: https://codereview.webrtc.org/1676923002 Cr-Commit-Position: refs/heads/master@{#11520}
56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
/*
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* Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/media/devices/libudevsymboltable.h"
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#include <dlfcn.h>
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#include "webrtc/base/logging.h"
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namespace cricket {
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#define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME LIBUDEV_SYMBOLS_CLASS_NAME
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#define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST LIBUDEV_SYMBOLS_LIST
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#define LATE_BINDING_SYMBOL_TABLE_DLL_NAME "libudev.so.0"
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#include "webrtc/base/latebindingsymboltable.cc.def"
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#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
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#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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#undef LATE_BINDING_SYMBOL_TABLE_DLL_NAME
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bool IsWrongLibUDevAbiVersion(rtc::DllHandle libudev_0) {
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rtc::DllHandle libudev_1 = dlopen("libudev.so.1",
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RTLD_NOW|RTLD_LOCAL|RTLD_NOLOAD);
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bool unsafe_symlink = (libudev_0 == libudev_1);
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if (unsafe_symlink) {
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// .0 and .1 are distinct ABIs, so if they point to the same thing then one
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// of them must be wrong. Probably the old has been symlinked to the new in
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// a misguided attempt at backwards compatibility.
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LOG(LS_ERROR) << "libudev.so.0 and libudev.so.1 unsafely point to the"
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" same thing; not using libudev";
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} else if (libudev_1) {
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// If libudev.so.1 is resident but distinct from libudev.so.0, then some
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// system library loaded the new ABI separately. This is not a problem for
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// LateBindingSymbolTable because its symbol look-ups are restricted to its
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// DllHandle, but having libudev.so.0 resident may cause problems for that
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// system library because symbol names are not namespaced by DLL. (Although
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// our use of RTLD_LOCAL should avoid most problems.)
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LOG(LS_WARNING)
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<< "libudev.so.1 is resident but distinct from libudev.so.0";
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}
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if (libudev_1) {
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// Release the refcount that we acquired above. (Does not unload the DLL;
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// whoever loaded it still needs it.)
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dlclose(libudev_1);
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}
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return unsafe_symlink;
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}
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} // namespace cricket
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