Bénédikt Tran 6ac578cf53 [3.12] gh-126554: ctypes: Correctly handle NULL dlsym values (GH-126555) (GH-127764) ... For dlsym(), a return value of NULL does not necessarily indicate an error [1]. Therefore, to avoid using stale (or NULL) dlerror() values, we must: 1. clear the previous error state by calling dlerror() 2. call dlsym() 3. call dlerror() If the return value of dlerror() is not NULL, an error occured. In ctypes we choose to treat a NULL return value from dlsym() as a "not found" error. This is the same as the fallback message we use on Windows, Cygwin or when getting/formatting the error reason fails. [1]: https://man7.org/linux/man-pages/man3/dlsym.3.html Signed-off-by: Georgios Alexopoulos <grgalex42@gmail.com> Signed-off-by: Georgios Alexopoulos <grgalex@ba.uoa.gr> Co-authored-by: George Alexopoulos <giorgosalexo0@gmail.com> Co-authored-by: Peter Bierma <zintensitydev@gmail.com> Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> Co-authored-by: Petr Viktorin <encukou@gmail.com>		2024-12-17 13:53:43 +02:00
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2024-11-07-20-24-58.gh-issue-126554.ri12eb.rst	[3.12] gh-126554: ctypes: Correctly handle NULL dlsym values (GH-126555) (GH-127764)	2024-12-17 13:53:43 +02:00