[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Vinay Sajip  added the comment:

The issue is being reopened, see this comment on bpo-16575:

https://bugs.python.org/msg359834

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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Change by Vinay Sajip :


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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Vinay Sajip  added the comment:


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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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Vinay Sajip  added the comment:


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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[issue16576] ctypes: structure with bitfields as argument

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/17223

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[issue16576] ctypes: structure with bitfields as argument

[miss-islington]

Change by miss-islington :


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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Vinay Sajip  added the comment:


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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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Change by Vinay Sajip :


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pull_request: https://github.com/python/cpython/pull/17097

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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Change by Vinay Sajip :


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versions: +Python 3.7, Python 3.8, Python 3.9 -Python 2.7, Python 3.2

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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Change by Vinay Sajip :


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pull_request: https://github.com/python/cpython/pull/15839

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[issue16576] ctypes: structure with bitfields as argument

[Vinay Sajip]

Changes by Vinay Sajip :


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[issue16576] ctypes: structure with bitfields as argument

[Roundup Robot]

Roundup Robot added the comment:

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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[issue16576] ctypes: structure with bitfields as argument

[Roundup Robot]

Roundup Robot added the comment:

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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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Eli Bendersky added the comment:

The patch addresses issue16575 as well

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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Changes by Eli Bendersky eli...@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Eli Bendersky added the comment:

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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Added file: http://bugs.python.org/file29326/issue16576.docfix.1.patch

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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Eli Bendersky added the comment:

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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Added file: http://bugs.python.org/file29327/issue16576.docfix.1.patch

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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Changes by Eli Bendersky eli...@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Changes by Eli Bendersky eli...@gmail.com:


Removed file: http://bugs.python.org/file29327/issue16576.docfix.1.patch

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[issue16576] ctypes: structure with bitfields as argument

[Eli Bendersky]

Changes by Eli Bendersky eli...@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Arfrever Frehtes Taifersar Arahesis]

Changes by Arfrever Frehtes Taifersar Arahesis arfrever@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Meador Inge]

Changes by Meador Inge mead...@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Armin Rigo]

New submission from Armin Rigo:

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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components: ctypes
files: test185_lib.tgz
messages: 176629
nosy: arigo
priority: normal
severity: normal
status: open
title: ctypes: structure with bitfields as argument
type: crash
versions: Python 2.7, Python 3.2
Added file: http://bugs.python.org/file28156/test185_lib.tgz

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[issue16576] ctypes: structure with bitfields as argument

[Alex Gaynor]

Changes by Alex Gaynor alex.gay...@gmail.com:


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[issue16576] ctypes: structure with bitfields as argument

[Armin Rigo]

Armin Rigo added the comment:

The same misbehavior occurs if the structures are packed (_pack_ = 1).  
Attached in test186_lib.tgz.

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Added file: http://bugs.python.org/file28157/test186_lib.tgz

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