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Date: Tue, 27 Mar 2018 11:17:12 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Joey Pabalinas <joeypabalinas@gmail.com>,
	Bart Schaefer <schaefer@brasslantern.com>,
	Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: "echo | ps -j $(:) | cat | cat | cat" runs components in
 different process groups
Message-ID: <20180327101712.GA5473@chaz.gmail.com>
Mail-Followup-To: Joey Pabalinas <joeypabalinas@gmail.com>,
	Bart Schaefer <schaefer@brasslantern.com>,
	Zsh hackers list <zsh-workers@zsh.org>
References: <20180323161612.GB4857@chaz.gmail.com>
 <180323163614.ZM10192@torch.brasslantern.com>
 <180323221959.ZM27569@torch.brasslantern.com>
 <20180324080514.txxyrb3qiztu4pqt@gmail.com>
 <20180324173406.GA18604@chaz.gmail.com>
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User-Agent: Mutt/1.5.24 (2015-08-30)

2018-03-24 17:34:06 +0000, Stephane Chazelas:
[...]
> That means, that one can't ^C
> 
> sleep 1 | cat $(sleep 10)
> 
> for instance.
[...]

For the record, while

/bin/sleep 1 | cat $(/bin/sleep 10) | cat

can be interrupted in ksh93,

ksh93$ /bin/sleep 1 | cat $(ps -jf>&2) $(/bin/sleep 20)
UID        PID  PPID  PGID   SID  C STIME TTY          TIME CMD
chazelas 16259  5079 16259 16259  0 10:58 pts/7    00:00:00 /bin/zsh
chazelas 16281 16259 16281 16259  0 10:59 pts/7    00:00:00 ksh93 -o emacs
chazelas 16355 16281 16355 16259  0 11:02 pts/7    00:00:00 /bin/sleep 1
chazelas 16356 16281 16281 16259  0 11:02 pts/7    00:00:00 ps -jf
chazelas 16357 16281 16281 16259  0 11:02 pts/7    00:00:00 /bin/sleep 20

Cannot (see how ps -j and sleep 20 run (concurrently!) in a
different process group from sleep 1) like in zsh (and a ^Z
while sleep 1 is running causes a deadlock).

One difference with zsh is that it can't be worked around by
running that last pipe component in a subshell (as ksh93 fakes
subshells instead of forking).

-- 
Stephane