New submission from Ivan Pozdeev:
a LibraryLoader returns the same _FuncPtr object for a given function every
time. This way, if two libraries set its attributes (most possibly, `argtypes')
to incompatible values (both representing the same C-level entities), one of
them will stop working.
I've just discovered such a problem with `pyreadline' and `colorama' which both
utilize `windll.kernel32.GetConsoleScreenBufferInfo'.
One solution is to make LibraryLoader return a new object each time. Another
(worse IMO) is to provide a clone function for _FuncPtr (it cannot be clones by
`copy.copy()').
An example code:
>>> import pyreadline
>>> import pip._vendor.colorama
Readline internal error
Traceback (most recent call last):
File "c:\python27\lib\site-packages\pyreadline\console\console.py", line 768,
in hook_wrapper_23
res = ensure_str(readline_hook(prompt))
File "c:\python27\lib\site-packages\pyreadline\rlmain.py", line 569, in
readline
self.readline_setup(prompt)
File "c:\python27\lib\site-packages\pyreadline\rlmain.py", line 565, in
readline_setup
self._print_prompt()
File "c:\python27\lib\site-packages\pyreadline\rlmain.py", line 466, in
_print_prompt
x, y = c.pos()
File "c:\python27\lib\site-packages\pyreadline\console\console.py", line 261,
in pos
self.GetConsoleScreenBufferInfo(self.hout, byref(info))
ArgumentError: argument 2: <type 'exceptions.TypeError'>: expected
LP_CONSOLE_SCREEN_BUFFER_INFO instance instead of pointer to
CONSOLE_SCREEN_BUFFER_INFO
(the same error is printed continuously, on Ctrl-C, the interpreter crashes)
----------
components: ctypes
messages: 228423
nosy: Ivan.Pozdeev
priority: normal
severity: normal
status: open
title: ctypes.LibraryLoader returns singleton objects, resulting in usage
conflicts
type: crash
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue22552>
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