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1 /* | |
2 * Copyright (c) 2004 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 "webrtc/media/devices/libudevsymboltable.h" | |
12 | |
13 #include <dlfcn.h> | |
14 | |
15 #include "webrtc/base/logging.h" | |
16 | |
17 namespace cricket { | |
18 | |
19 #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME LIBUDEV_SYMBOLS_CLASS_NAME | |
20 #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST LIBUDEV_SYMBOLS_LIST | |
21 #define LATE_BINDING_SYMBOL_TABLE_DLL_NAME "libudev.so.0" | |
22 #include "webrtc/base/latebindingsymboltable.cc.def" | |
23 #undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME | |
24 #undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST | |
25 #undef LATE_BINDING_SYMBOL_TABLE_DLL_NAME | |
26 | |
27 bool IsWrongLibUDevAbiVersion(rtc::DllHandle libudev_0) { | |
28 rtc::DllHandle libudev_1 = dlopen("libudev.so.1", | |
29 RTLD_NOW|RTLD_LOCAL|RTLD_NOLOAD); | |
30 bool unsafe_symlink = (libudev_0 == libudev_1); | |
31 if (unsafe_symlink) { | |
32 // .0 and .1 are distinct ABIs, so if they point to the same thing then one | |
33 // of them must be wrong. Probably the old has been symlinked to the new in | |
34 // a misguided attempt at backwards compatibility. | |
35 LOG(LS_ERROR) << "libudev.so.0 and libudev.so.1 unsafely point to the" | |
36 " same thing; not using libudev"; | |
37 } else if (libudev_1) { | |
38 // If libudev.so.1 is resident but distinct from libudev.so.0, then some | |
39 // system library loaded the new ABI separately. This is not a problem for | |
40 // LateBindingSymbolTable because its symbol look-ups are restricted to its | |
41 // DllHandle, but having libudev.so.0 resident may cause problems for that | |
42 // system library because symbol names are not namespaced by DLL. (Although | |
43 // our use of RTLD_LOCAL should avoid most problems.) | |
44 LOG(LS_WARNING) | |
45 << "libudev.so.1 is resident but distinct from libudev.so.0"; | |
46 } | |
47 if (libudev_1) { | |
48 // Release the refcount that we acquired above. (Does not unload the DLL; | |
49 // whoever loaded it still needs it.) | |
50 dlclose(libudev_1); | |
51 } | |
52 return unsafe_symlink; | |
53 } | |
54 | |
55 } // namespace cricket | |
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