[3.13] gh-126554: ctypes: Correctly handle NULL dlsym values (GH-126555) #126861
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…-126555) 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 (cherry picked from commit 8717f79) Co-authored-by: George Alexopoulos <giorgosalexo0@gmail.com> Signed-off-by: Georgios Alexopoulos <grgalex42@gmail.com> Signed-off-by: Georgios Alexopoulos <grgalex@ba.uoa.gr> 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>
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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:
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.
(cherry picked from commit 8717f79)
Co-authored-by: George Alexopoulos giorgosalexo0@gmail.com
Signed-off-by: Georgios Alexopoulos grgalex42@gmail.com
Signed-off-by: Georgios Alexopoulos grgalex@ba.uoa.gr
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