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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <180411151025.ZM19332@torch.brasslantern.com>
Date: Wed, 11 Apr 2018 15:10:24 -0700
In-Reply-To: <20180410145926.64c4f671@camnpupstephen.cam.scsc.local>
Comments: In reply to Peter Stephenson <p.stephenson@samsung.com>
        "Re: "echo | ps -j $(:) | cat | cat | cat" runs components in different process groups" (Apr 10,  2:59pm)
References: <20180323161612.GB4857@chaz.gmail.com> 
	<180323163614.ZM10192@torch.brasslantern.com> 
	<180323221959.ZM27569@torch.brasslantern.com> 
	<20180324080514.txxyrb3qiztu4pqt@gmail.com> 
	<CGME20180324221021epcas1p184507a6328dbd505b97db69c1f9d8194@epcas1p1.samsung.com> 
	<180324150945.ZM32251@torch.brasslantern.com> 
	<20180410124545.13fccd5d@camnpupstephen.cam.scsc.local> 
	<20180410145926.64c4f671@camnpupstephen.cam.scsc.local>
X-Mailer: OpenZMail Classic (0.9.2 24April2005)
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: "echo | ps -j $(:) | cat | cat | cat" runs components in different process groups
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On Apr 10,  2:59pm, Peter Stephenson wrote:
} Subject: Re: "echo | ps -j $(:) | cat | cat | cat" runs components in diff
}
} +		if (pn->pid == jn->gleader) {
} +		    jn->gleader = 0;
} +		    /* HERE: check this was actually in foreground... */
} +		    attachtty(mypgrp);
} +		}

I think attachtty() will simply fail here if mypgrp is not already in
the foreground, but I confess not to be 100% certain.