gh-52008: document that absolute paths can break use_errno=True in ct…#146504
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Das-Chinmay wants to merge 3 commits intopython:mainfrom
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gh-52008: document that absolute paths can break use_errno=True in ct…#146504Das-Chinmay wants to merge 3 commits intopython:mainfrom
Das-Chinmay wants to merge 3 commits intopython:mainfrom
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… in ctypes
Loading a shared library via an absolute path (e.g. CDLL('/lib/libc.so.6'))
can cause use_errno=True to silently malfunction on Linux because dlopen may
return a separate library instance with its own errno variable. Add a note
to the CDLL.use_errno parameter docs warning about this and recommending the
use of an unqualified name or ctypes.util.find_library instead.
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Loading a shared library via an absolute path (e.g.
CDLL('/lib/libc.so.6'))can cause
use_errno=Trueto silently malfunction on Linux:dlopenmayreturn a separate instance of the library with its own
errnovariable, soctypes swaps the wrong one and
get_errno()always returns 0.Adds a
.. note::block to theuse_errnoparameter docs inDoc/library/ctypes.rstwarning about this and recommending the use of anunqualified name or
ctypes.util.find_libraryinstead.Fixes gh-52008
📚 Documentation preview 📚: https://cpython-previews--146504.org.readthedocs.build/