From: "Bart Schaefer" <schaefer@brasslantern.com>
To: Clint Adams <clint@zsh.org>, zsh-workers@sunsite.dk
Cc: phil@fifi.org
Subject: Re: GNU nohup oddness
Date: Fri, 6 Dec 2002 10:14:46 +0000 [thread overview]
Message-ID: <1021206101446.ZM10013@candle.brasslantern.com> (raw)
In-Reply-To: <20021206003013.GA10400@dman.com>
On Dec 5, 7:30pm, Clint Adams wrote:
}
} nohup ./zshscript &
} <Ctrl-D>
} <Ctrl-D>
}
} Does anyone know what's going on here?
The problem seems to be a combination of three things:
(1) The HUP option is set by default.
(2) When HUP is set, zsh _explicitly_ sends SIGHUP to process group
in its job table on exit, rather than rely on the tty driver to
do it when the tty is hung up.
(3) In Src/init.c:init_signals(), zsh explicitly installs a SIGHUP
handler, even in non-interactive shells. It has done so for a
very long time -- as far back as recorded in my CVS of 3.0.x,
which means prior to 27-Jun-97.
That last one is the real culprit, because it means that jobs started
as part of the script inherit the SIG_DFL handler from the #! zsh,
rather than inheriting SIG_IGN from the nohup great-grandparent (it's
"great-" because `nohup' runs `nice' as the grandparent). So even if
the script does `setopt nohup', the top-level shell's process-group
kill will hit all the children of the script.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
next prev parent reply other threads:[~2002-12-06 10:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-06 0:30 Clint Adams
2002-12-06 10:14 ` Bart Schaefer [this message]
2002-12-07 15:24 ` Clint Adams
2002-12-07 17:43 ` Bart Schaefer
2002-12-09 18:00 ` Peter Stephenson
2002-12-12 4:09 ` Bart Schaefer
2002-12-12 10:39 ` Peter Stephenson
2002-12-12 15:33 ` Bart Schaefer
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