GNU bug report logs - #38632
27.0.50; Emacs process name is changed permanently upon creating a named thread

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Package: emacs;

Reported by: Ihor Radchenko <yantar92 <at> gmail.com>

Date: Mon, 16 Dec 2019 06:45:02 UTC

Severity: normal

Merged with 39003

Found in versions 27.0.50, 27.0.60

Fixed in version 27.1

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 38632 <at> debbugs.gnu.org, yantar92 <at> gmail.com
Subject: bug#38632: 27.0.50; Emacs process name is changed permanently upon creating a named thread
Date: Wed, 18 Dec 2019 19:18:57 +0200

> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: yantar92 <at> gmail.com,  38632 <at> debbugs.gnu.org
> Date: Wed, 18 Dec 2019 18:04:53 +0100
> 
>     Eli> (Btw, the limitation is 16 bytes, including the terminating null, so
>     Eli> truncation needs to be clever about non-ASCII characters, and I wonder
>     Eli> what does prctl do when 15 bytes end in the middle of a multibyte
>     Eli> sequence.)
> 
> It does exactly what you'd expect, it drops the extraneous bytes, so
> putting eg ü on the boundary results in a name ending in à (#xc3).

So it is one more reason to do or own truncation, so we do it right.

> In any case, if emacs or prctl truncates, then the name as reported
> by 'list-threads' will be out of sync with pthread_getname_np, unless
> you'd want to adjust that too.

We need to truncate the names we store in the thread object (and
document that).
This bug report was last modified 5 years and 138 days ago.

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