a23f0ca4ba
R=wu@webrtc.org Review URL: https://webrtc-codereview.appspot.com/3839005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5120 4adac7df-926f-26a2-2b94-8c16560cd09d
73 lines
3.3 KiB
C++
73 lines
3.3 KiB
C++
/*
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* libjingle
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* Copyright 2004 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "talk/media/devices/libudevsymboltable.h"
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#include <dlfcn.h>
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#include "talk/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 "talk/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(talk_base::DllHandle libudev_0) {
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talk_base::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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