[screen-devel] [bug #48662] Backtick in background does not exit when screen exits

[Amadeusz Sławiński]

URL:
  <http://savannah.gnu.org/bugs/?48662>

                 Summary: Backtick in background does not exit when screen
exits
                 Project: GNU Screen
            Submitted by: amade
            Submitted on: Sat 30 Jul 2016 11:32:14 AM GMT
                Category: Program Logic
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

On Fri, 29 Jul 2016 17:46:29 -0400
Vincent Newell <address@hidden> 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
> <address@hidden> 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
> >
> >  




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