| msg176629 - (view) |
Author: Armin Rigo (arigo) *  |
Date: 2012-11-29 04:53 |
| ctypes pretends to support passing arguments to C functions that are structures containing bitfields, or at least does not explicitly forbid it. But doing so results in misbehavior or segfaults in libffi itself. Indeed, libffi has no support for this, and ctypes just describes a field like "int x:1;" as "int x;". The attached example segfaults on Linux x86-64. |
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| msg176631 - (view) |
Author: Armin Rigo (arigo) * |
Date: 2012-11-29 05:24 |
| The same misbehavior occurs if the structures are packed ("_pack_ = 1"). Attached in test186_lib.tgz. |
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| msg183595 - (view) |
Author: Eli Bendersky (eli.bendersky) * |
Date: 2013-03-06 15:02 |
| I propose to start with the attached documentation fix (generated vs. 3.2 but should be applied to all active branches). A code fix has to be discussed more thoroughly because in theory some code running only on x86-32 can rely on it and will break. |
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| msg183665 - (view) |
Author: Eli Bendersky (eli.bendersky) * |
Date: 2013-03-07 14:32 |
| The patch addresses as well |
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| msg183816 - (view) |
Author: Roundup Robot (python-dev)  |
Date: 2013-03-09 13:56 |
| New changeset 0acd9408b6f1 by Eli Bendersky in branch '3.2': Add warning in ctypes documentation for #16575 and #16576 http://hg.python.org/cpython/rev/0acd9408b6f1 New changeset bfc159f8e4b4 by Eli Bendersky in branch '3.3': Add warning in ctypes documentation for #16575 and #16576 http://hg.python.org/cpython/rev/bfc159f8e4b4 New changeset 502624235c7b by Eli Bendersky in branch 'default': Add warning in ctypes documentation for #16575 and #16576 http://hg.python.org/cpython/rev/502624235c7b |
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| msg183818 - (view) |
Author: Roundup Robot (python-dev) |
Date: 2013-03-09 13:57 |
| New changeset eece32440a52 by Eli Bendersky in branch '2.7': Add warning in ctypes documentation for #16575 and #16576 http://hg.python.org/cpython/rev/eece32440a52 |
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| msg356447 - (view) |
Author: Vinay Sajip (vinay.sajip) * |
Date: 2019-11-12 12:29 |
| New changeset 106271568c58cfebae58f0c52b640dbe716ba2ce by Vinay Sajip in branch 'master': bpo-16576: Add checks for bitfields passed by value to functions. (GH-17097) https://github.com/python/cpython/commit/106271568c58cfebae58f0c52b640dbe716ba2ce |
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| msg356869 - (view) |
Author: Vinay Sajip (vinay.sajip) * |
Date: 2019-11-18 14:29 |
| New changeset bef2815533011be9f0ce5fa2965bcada76b509b8 by Vinay Sajip (Miss Islington (bot)) in branch '3.8': bpo-16576: Add checks for bitfields passed by value to functions. (GH-17097) (GH-17223) https://github.com/python/cpython/commit/bef2815533011be9f0ce5fa2965bcada76b509b8 |
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| msg357224 - (view) |
Author: Vinay Sajip (vinay.sajip) * |
Date: 2019-11-21 21:47 |
| New changeset 91c15a542cb780377dcde8fc17ba93111bc1d1cf by Vinay Sajip (Miss Islington (bot)) in branch '3.7': [3.7] bpo-16576: Add checks for bitfields passed by value to functions. (GH-17097) (GH-17224) https://github.com/python/cpython/commit/91c15a542cb780377dcde8fc17ba93111bc1d1cf |
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| msg359835 - (view) |
Author: Vinay Sajip (vinay.sajip) * |
Date: 2020-01-12 07:46 |
| The issue is being reopened, see this comment on bpo-16575: https://bugs.python.org/msg359834 |
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