bugGNU Screen - Bugs: bug #48662, Backtick in background does not...


bug #48662: Backtick in background does not exit when screen exits

Submitted by:  Amadeusz Sławiński <amade>
Submitted on:  Sat 30 Jul 2016 11:32:14 AM UTC  
Category: Program LogicSeverity: 3 - Normal
Priority: 5 - NormalStatus: Confirmed
Privacy: PublicAssigned to: None
Open/Closed: OpenRelease: None
Fixed Release: NonePlanned Release: None
Work Required: None

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Sat 30 Jul 2016 11:32:14 AM UTC, original submission:

On Fri, 29 Jul 2016 17:46:29 -0400
Vincent Newell <vince.newell@gmail.com> wrote:

> (Argh, forsaken by Gmail, sorry.) Continued:
> I tried on both Ubuntu 14.04.4 updates version (Screen version
> 4.01.00devel (GNU) 2-May-06)
> as well as a fresh clone from master (Screen version 4.99.0 (build on
> Jul 29 2016 17:31:06)
> I was able to reproduce this problem with the following lines in my
> .screenrc
> backtick 1 0 0 bash -ilc "while true ; do sleep 5 ; date ; done"
> hardstatus alwayslastline "%1`"
> Is there any way to make this backtick program exit on screen exit?
> Thanks
> Vince
> On Fri, Jul 29, 2016 at 5:44 PM, Vincent Newell
> <vince.newell@gmail.com> wrote:
> > To whomever's listening -
> >
> > I am trying to create indicator to display a system state string.
> > This string comes from some software following a PUB-SUB
> > architecture. My first thought was to use backtick to callout
> > periodically to 'poll' the state, but the act of initializing,
> > subscribing, getting a message, and unsubscribing has a lot of
> > overhead. Since my software already supports PUB-SUB I was hoping
> > backtick supports a background process. And, just my luck! It
> > does!
> >
> > "If both the lifespan and the autorefresh parameters are zero, the
> > backtick program is expected to stay in the background and generate
> > output once in a while. In this case, the command is executed right
> > away and screen stores the last line of output. If a new line gets
> > printed screen will automatically refresh the hardstatus or the
> > captions."
> >
> > However, it seems like the background command does not exit when
> > screen exits.
> >
> > I tried on both Ubuntu 14.04.4 updates
> >
> >

Amadeusz Sławiński <amade>
Project Administrator


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Attach File(s):

Attached Files
file #38067:  0001-readpipe-TERM-forked-process-on-exit.patch added by vnewell (1KiB - text/x-patch - Really not sure if this is the right way to fix this problem, but maybe it will help someone with a starting point.)


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -unavailable- added by vnewell (Updated the item)
  • -unavailable- added by amade (Submitted the item)

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    Follows 1 latest change.

    Date Changed By Updated Field Previous Value => Replaced By
    Mon 01 Aug 2016 07:14:38 PM UTCvnewellAttached File-=>Added 0001-readpipe-TERM-forked-process-on-exit.patch, #38067

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