Yury Selivanov <yseliva...@gmail.com> added the comment:

> It's worse than a resource leak - the same file descriptor number could be 
> reused for a different file/socket, and then depending on the selector in 
> use, you could see the data from a completely different connection. 

I actually debugged a bug like this in asyncio code once.  Took me quite a bit 
of time to figure it out.

> I did see a bug like this years ago (in libcurl), although it's not a common 
> problem. I'd use the proposed hook if it existed, but it seems like an 
> intrusive solution to a rare issue.

I don't think the proposed solution is too intrusive.  If we don't like the 
"set a callback to intercept all socket.close()" idea, we can change it to: 
"add socket.add_close_callback() method to the socket object."

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32038>
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