Gregory P. Smith <g...@krypto.org> added the comment:

Code needed in a modern patch:

1) Use the system call if compile time configure detected it may be available.  
(if we just use syscall() rather than a libc wrapper, a configure check may not 
be necessary, but various #ifdefs likely are)
2) If (1) produces an error saying it isn't available at runtime (ie: running 
on a kernel that doesn't support it, regardless of where we were built), fall 
back to another approach (3)
3) if iterating over /proc/$pid/fd works at runtime, use that; else (4)
4) the existing brute force code.

----------
stage:  -> needs patch
versions: +Python 3.11 -Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue13788>
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