NetBSD Problem Report #50431
From mlelstv@fud.1st.de Sun Nov 15 13:31:42 2015
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for <gnats-bugs@gnats.NetBSD.org>; Sun, 15 Nov 2015 13:31:42 +0000 (UTC)
Message-Id: <20151115133130.C29C0D6CC@fud.1st.de>
Date: Sun, 15 Nov 2015 14:31:30 +0100 (CET)
From: mlelstv@serpens.de
Reply-To: mlelstv@serpens.de
To: gnats-bugs@gnats.NetBSD.org
Subject: sh job control doesn't work for loops
X-Send-Pr-Version: 3.95
>Number: 50431
>Category: bin
>Synopsis: sh job control doesn't work for loops
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: bin-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sun Nov 15 13:35:00 +0000 2015
>Last-Modified: Wed Oct 25 14:20:00 +0000 2017
>Originator: Michael van Elst
>Release: NetBSD 6.1_STABLE
>Organization:
>Environment:
System: NetBSD fud 6.1_STABLE NetBSD 6.1_STABLE (FUD) #3: Sat Sep 5 06:00:34 CEST 2015 mlelstv@pussyfoot:/home/netbsd6/obj.i386/home/netbsd6/src/sys/arch/i386/compile/FUD i386
Architecture: i386
Machine: i386
>Description:
When running a loop in an interactive shell, ctrl-Z doesn't stop the
whole loop but only the running command because each command is seen
as a separate job.
This fails also in netbsd-7 and -current. Our ksh behaves similarly.
A ctrl-C correctly aborts the loop.
It is questionable wether this is really a bug because sh (and ksh)
don't implement job control in a consistent way on other systems.
But the current behaviour is useless.
>How-To-Repeat:
$ for i in 1 2 3 4; do echo $i a; sleep 60; echo $i b; done
1 a
^Z[1] + Suspended sleep 60
1 b
2 a
^Z[2] - Suspended sleep 60
2 b
3 a
^Z[3] Suspended sleep 60
3 b
4 a
^Z[4] Suspended sleep 60
4 b
$ jobs
[1] Suspended sleep 60
[2] Suspended sleep 60
[3] - Suspended sleep 60
[4] + Suspended sleep 60
>Fix:
>Audit-Trail:
From: Michael van Elst <mlelstv@serpens.de>
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: bin/50431 sh job control doesn't work for loops
Date: Sat, 21 Jan 2017 14:37:30 +0100
Still the same behaviour in -current on multiple platforms.
--
Michael van Elst
Internet: mlelstv@serpens.de
"A potential Snark may lurk in every tree."
From: Robert Elz <kre@munnari.OZ.AU>
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: bin/50431 sh job control doesn't work for loops
Date: Wed, 25 Oct 2017 21:19:04 +0700
For what it is worth, and I know this does not help much,
but the BUGS section of sh(1) in (very) current now includes...
Job control of compound statements (loops, etc) is a complete mess.
I am aware of the problems, and if I can dream up an implementable
way (that is, not thousands of lines of extra code) to make it better
it will happen - someday.
kre
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.8 2006/05/07 09:23:38 tsutsui Exp $
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