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
Date: Tue, 27 Mar 2018 11:17:12 +0100 [thread overview]
Message-ID: <20180327101712.GA5473@chaz.gmail.com> (raw)
In-Reply-To: <20180324173406.GA18604@chaz.gmail.com>
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
next prev parent reply other threads:[~2018-03-27 10:17 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-23 16:16 Stephane Chazelas
2018-03-23 23:36 ` Bart Schaefer
2018-03-24 5:19 ` Bart Schaefer
2018-03-24 8:05 ` Joey Pabalinas
2018-03-24 17:34 ` Stephane Chazelas
2018-03-24 22:23 ` Bart Schaefer
2018-03-25 7:00 ` Stephane Chazelas
2018-03-25 8:26 ` Stephane Chazelas
2018-03-25 7:48 ` Stephane Chazelas
2018-03-25 18:09 ` Stephane Chazelas
2018-03-27 10:17 ` Stephane Chazelas [this message]
2018-03-24 22:09 ` Bart Schaefer
2018-04-10 11:45 ` Peter Stephenson
2018-04-10 13:59 ` Peter Stephenson
2018-04-11 22:10 ` Bart Schaefer
2018-04-12 16:23 ` Peter Stephenson
2018-04-15 16:23 ` Stephane Chazelas
2018-04-15 17:38 ` Bart Schaefer
2018-04-15 18:58 ` Stephane Chazelas
2018-04-17 5:39 ` Bart Schaefer
2018-04-17 9:19 ` Peter Stephenson
2018-04-17 16:09 ` Bart Schaefer
2018-04-17 16:27 ` Bart Schaefer
2018-04-17 16:35 ` Peter Stephenson
2018-04-17 17:52 ` Bart Schaefer
2018-04-19 9:40 ` Peter Stephenson
2018-04-20 9:28 ` Forking earlier for background code Peter Stephenson
2018-04-20 10:01 ` Peter Stephenson
2018-04-20 12:54 ` Vin Shelton
[not found] ` <CGME20180420132008eucas1p1c297624e870975cd892c74254970faab@eucas1p1.samsung.com>
2018-04-20 13:20 ` Peter Stephenson
2018-04-20 16:01 ` Vin Shelton
2018-04-23 8:29 ` Peter Stephenson
2018-05-01 9:23 ` Peter Stephenson
[not found] ` <F3A62E38-24E2-4A62-8E19-F54C9B81E9E5@kba.biglobe.ne.jp>
2018-04-23 13:52 ` "echo | ps -j $(:) | cat | cat | cat" runs components in different process groups Peter Stephenson
2018-04-23 14:03 ` Peter Stephenson
[not found] ` <CGME20180423140859eucas1p2591bf1422614209979d4890383268c37@eucas1p2.samsung.com>
2018-04-23 14:08 ` Peter Stephenson
2018-04-23 15:29 ` Jun T.
2018-04-18 6:29 ` Stephane Chazelas
2018-04-18 16:33 ` Bart Schaefer
2018-04-10 9:53 ` Peter Stephenson
2018-03-25 7:38 ` Stephane Chazelas
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