On Sat, 07 Jan 2006 00:55:45 GMT, Neil Hodgson <[EMAIL PROTECTED]> wrote:
>Paul Watson:
>
>> Neil Hodgson wrote:
>>> It is unlikely that ctypes will be included in the standard Python
>>> build as it allows unsafe memory access making it much easier to crash
>>> Python.
>> Does extending Python with any C/C++ function not do the same thing?
>
> No. It is the responsibility of the extension author to ensure that
>there is no possibility of crashing Python. With ctypes, you have a
>generic mechanism that enables Python code to cause a crash.
Aahhh, come on. ctypes is crazy useful. Besides:
[EMAIL PROTECTED]:~$ python < .
Segmentation fault
[EMAIL PROTECTED]:~$ python
Python 2.4.2 (#2, Sep 30 2005, 21:19:01)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import marshal
>>> for i in range(1024):
... try:
... marshal.loads(os.urandom(16))
... except:
... pass
...
Segmentation fault
[EMAIL PROTECTED]:~$ python
Python 2.4.2 (#2, Sep 30 2005, 21:19:01)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import dl
>>> dl.open('/lib/libc.so.6').call('memcpy', 1, 2, 3)
Segmentation fault
[EMAIL PROTECTED]:~$ python
Python 2.4.2 (#2, Sep 30 2005, 21:19:01)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.setrecursionlimit(1000000000)
__main__:1: DeprecationWarning: integer argument expected, got float
>>> (lambda f: f(f))(lambda f: f(f))
Segmentation fault
[EMAIL PROTECTED]:~$
I could probably dig up a few more, if you want. So what's ctypes on top of
this?
Jean-Paul
>
> Neil
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