d4e598d57a
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6799 4adac7df-926f-26a2-2b94-8c16560cd09d
73 lines
3.3 KiB
C++
73 lines
3.3 KiB
C++
/*
|
|
* libjingle
|
|
* Copyright 2004 Google Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "talk/media/devices/libudevsymboltable.h"
|
|
|
|
#include <dlfcn.h>
|
|
|
|
#include "webrtc/base/logging.h"
|
|
|
|
namespace cricket {
|
|
|
|
#define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME LIBUDEV_SYMBOLS_CLASS_NAME
|
|
#define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST LIBUDEV_SYMBOLS_LIST
|
|
#define LATE_BINDING_SYMBOL_TABLE_DLL_NAME "libudev.so.0"
|
|
#include "webrtc/base/latebindingsymboltable.cc.def"
|
|
#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
|
|
#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
|
|
#undef LATE_BINDING_SYMBOL_TABLE_DLL_NAME
|
|
|
|
bool IsWrongLibUDevAbiVersion(rtc::DllHandle libudev_0) {
|
|
rtc::DllHandle libudev_1 = dlopen("libudev.so.1",
|
|
RTLD_NOW|RTLD_LOCAL|RTLD_NOLOAD);
|
|
bool unsafe_symlink = (libudev_0 == libudev_1);
|
|
if (unsafe_symlink) {
|
|
// .0 and .1 are distinct ABIs, so if they point to the same thing then one
|
|
// of them must be wrong. Probably the old has been symlinked to the new in
|
|
// a misguided attempt at backwards compatibility.
|
|
LOG(LS_ERROR) << "libudev.so.0 and libudev.so.1 unsafely point to the"
|
|
" same thing; not using libudev";
|
|
} else if (libudev_1) {
|
|
// If libudev.so.1 is resident but distinct from libudev.so.0, then some
|
|
// system library loaded the new ABI separately. This is not a problem for
|
|
// LateBindingSymbolTable because its symbol look-ups are restricted to its
|
|
// DllHandle, but having libudev.so.0 resident may cause problems for that
|
|
// system library because symbol names are not namespaced by DLL. (Although
|
|
// our use of RTLD_LOCAL should avoid most problems.)
|
|
LOG(LS_WARNING)
|
|
<< "libudev.so.1 is resident but distinct from libudev.so.0";
|
|
}
|
|
if (libudev_1) {
|
|
// Release the refcount that we acquired above. (Does not unload the DLL;
|
|
// whoever loaded it still needs it.)
|
|
dlclose(libudev_1);
|
|
}
|
|
return unsafe_symlink;
|
|
}
|
|
|
|
} // namespace cricket
|