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From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: $PPID not updated when the PPID changes (parent killed)
Date: Sun, 16 May 2021 11:37:15 -0700	[thread overview]
Message-ID: <CAH+w=7a3y6MjrPQWnPc1O0ESroLesZXwaQ-_AxJB5XRk7xDj2Q@mail.gmail.com> (raw)
In-Reply-To: <20210516152418.GA39669@zira.vinc17.org>

On Sun, May 16, 2021 at 8:24 AM Vincent Lefevre <vincent@vinc17.net> wrote:
>
> i.e. $PPID is not updated when the PPID changes, i.e. the parent
> process is killed.

$PPID means the ID of the process that spawned this one, not the
current value of getppid().

If you want the latter, it's $sysparams[ppid] (with the zsh/system
module loaded).  In fact the correct way to determine whether the
original parent has exited is to check (( PPID != sysparams[ppid] )).

We could enable a non-portable way to be alerted on parent exit using
prctl() now that HAVE_PRCTL is being checked by configure, but it
would be expensive to emulate in other cases.


  reply	other threads:[~2021-05-16 18:37 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-16 15:24 Vincent Lefevre
2021-05-16 18:37 ` Bart Schaefer [this message]
2021-05-17 20:26   ` Vincent Lefevre
2021-05-17 21:00     ` Bart Schaefer
2021-05-17 22:27       ` Phil Pennock
2021-05-17 23:15         ` Bart Schaefer
2021-05-18  0:30           ` Phil Pennock
2021-05-18  1:14             ` Bart Schaefer
2021-05-18  8:28             ` Vincent Lefevre
2021-05-18  8:15           ` Vincent Lefevre
2021-05-18 14:53             ` Bart Schaefer
2021-05-19  4:25               ` Bart Schaefer
2021-07-18 23:10                 ` Lawrence Velázquez
2021-05-18 15:18           ` Mikael Magnusson
2021-05-18 16:14             ` Peter Stephenson
2021-05-18 18:20               ` Bart Schaefer
2021-05-18 17:37           ` Martijn Dekker
2021-05-18 18:08             ` Bart Schaefer
2021-05-18 19:40               ` Martijn Dekker
2021-05-18 18:06           ` Stephane Chazelas
2021-05-18 18:12             ` Bart Schaefer
2021-05-18 18:50               ` $SHLVL origin (was: $PPID not updated when the PPID changes (parent killed)) Stephane Chazelas
2021-05-18 15:56         ` $PPID not updated when the PPID changes (parent killed) Stephane Chazelas

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