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Re: Why does close_stdout close stdout and stderr?

From: Florian Weimer
Subject: Re: Why does close_stdout close stdout and stderr?
Date: Thu, 09 May 2019 08:39:01 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

* Bernhard Voelker:

> On 5/6/19 9:19 PM, Florian Weimer wrote:
>> How would a programmer check that close_stdout has run, to determine
>> that stdout and stderr are now invalid, to avoid the memory corruption?
> lib/closeout.c:98:
>   "Since close_stdout is commonly registered via 'atexit', [...]"
> close_stdout is used right before the process ends, so I don't see
> what further actions would follow.

atexit handlers run before ELF destructors (and some C++ destructors).
There can also be multiple such handlers.  So it's not true that an
atexit handler always runs last.


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