GNU bug report logs - #79079
31.0.50; Piped command output is sometimes lost in Eshell

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jim Porter <jporterbugs <at> gmail.com>
Cc: mail <at> daniel-mendler.de, eggert <at> cs.ucla.edu, 79079 <at> debbugs.gnu.org
Subject: bug#79079: 31.0.50; Piped command output is sometimes lost in Eshell
Date: Sun, 27 Jul 2025 07:30:34 +0300

> Date: Sat, 26 Jul 2025 10:23:48 -0700
> Cc: mail <at> daniel-mendler.de, eggert <at> cs.ucla.edu, 79079 <at> debbugs.gnu.org
> From: Jim Porter <jporterbugs <at> gmail.com>
> 
> On 7/26/2025 3:15 AM, Eli Zaretskii wrote:
> >> Date: Thu, 24 Jul 2025 08:52:16 -0700
> >> Cc: mail <at> daniel-mendler.de, 79079 <at> debbugs.gnu.org
> >> From: Jim Porter <jporterbugs <at> gmail.com>
> >>
> > So calling the filter of the "head"s process when we get EPIPE should
> > fix that, no?
> 
> It would probably fix this particular case, but I'm not sure it's the 
> correct way to do it in general. I'll construct some test programs to 
> test out some of the corner cases here so that we can be sure whatever 
> implementation we do settle on works correctly in all cases.

We should try doing what a Posix shell does in that case.  A program
that gets EPIPE generally exits with a failure status (right?),
anything that happens after that is done by the shell itself.

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