[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Terminating background bash kills the parent?
From: |
Chet Ramey |
Subject: |
Re: Terminating background bash kills the parent? |
Date: |
Wed, 26 Dec 2018 11:42:00 -0500 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 12/20/18 12:02 AM, Bize Ma wrote:
> Open a new terminal like xterm, change prompt to something like:
>
> PS1=' $SHLVL $ '
>
> Start a couple of bash subshells:
>
> 1 $ bash
> 2 $ bash
> 3 $ echo $$
> 9371
>
> Suspend the last one:
>
> 3 $ suspend
> [1]+ Stopped bash
> 2 $ echo $$
> 9313
> 2 $
>
> Make the suspended shell continue:
>
> 2 $ kill -CONT 9371
>
> The parent gets killed
>
> 1 $ echo $$
> 9034
> 1 $
The terminal ends up in the wrong process group, and the parent shell can't
do anything about it. You either get EOF on stdin, -1/EIO on the read, or a
SIGHUP.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/