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Re: bug#57129: 29.0.50; Improve behavior of conditionals in Eshell

From: Eli Zaretskii
Subject: Re: bug#57129: 29.0.50; Improve behavior of conditionals in Eshell
Date: Tue, 16 Aug 2022 20:41:06 +0300

> Cc: jporterbugs@gmail.com, larsi@gnus.org, bug-gnulib@gnu.org,
>  57129@debbugs.gnu.org, bruno@clisp.org
> Date: Tue, 16 Aug 2022 20:04:49 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Therefore, if there's no intention to fix this in Gnulib, I'm going to
> update the documentation of make-temp-file so that Emacs users and
> programmers will be informed about that and will be careful enough to
> side-step these issues in all the situations.  (Not that I understand
> why won't Gnulib provide consistent behavior on all platforms, but I
> guess it's above my pay grade.)

And btw, looking closer, I see that this is a regression in Emacs 28,
which was caused by a change in Gnulib: the versions of tempname.c
that we used up to and including Emacs 27.2 used gettimeofday and the
PID to generate the file name, so it was more random than the code in
current Gnulib, and in particular the sequence of

   generate file-name1
   delete file-name1
   generate file-name2

would produce file-name2 that is different from file-name1.  With the
current code in Gnulib, something similar happens only on glibc
systems.  So I hope the code in Gnulib's tempname.c will be amended to
call clock_gettime or something similar, so that the names on
non-glibc platforms could also be random.  Or, failing that, at least
that gen_tempname in glibc would behave identically to other systems,
i.e. start from a fixed "random" value.

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