Re: background, pipeline, hang

From	Chet Ramey <chet.ramey@case.edu>
Newsgroups	gnu.bash.bug
Subject	Re: background, pipeline, hang
Date	2019-07-14 17:06 -0400
Organization	ITS, Case Western Reserve University
Message-ID	<mailman.1335.1563138414.2688.bug-bash@gnu.org> (permalink)
References	<20190712140057.7F34B12552B@sint.jonkmans.nl> <6c7c3315-d319-d8bd-dfcc-962f9b9ce80a@case.edu> <20190713095508.GB21798@sint.jonkmans.nl> <b078e481-777c-2b6a-2773-ab9925c2c31c@case.edu>

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On 7/13/19 5:55 AM, Mike Jonkmans wrote:

> This runs for two seconds:
> 	bash --norc --noprofile -ic "trap 'tput hs' DEBUG; sleep 2 & :|:|:"
> 
> While this immediately finishes:
> 	bash --norc --noprofile -ic "trap ':' DEBUG; sleep 2 & :|:|:"

I believe this has to do with running a process that forks from the DEBUG
trap while executing a pipeline.

Just another reason executing a DEBUG trap for a simple command that's run
as part of a pipeline is a bad idea.

This looks like a Linux-only problem, so I'll look when I have better
access to a Linux machine.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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Re: background, pipeline, hang Chet Ramey <chet.ramey@case.edu> - 2019-07-14 17:06 -0400

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