Re: Glib::IO->add_watch

[Daniel Kasak <d j kasak dk gmail com>]

On Thu, Apr 4, 2019 at 6:45 AM Jeff via gtk-perl-list
<gtk-perl-list gnome org> wrote:
> On 03/04/2019 00:35, Daniel Kasak via gtk-perl-list wrote:
> > Hi all. I'm trying to adapt some code I have for tailing the output of
> > an app. When I fork using open() ... things work ( I have some issues
> > with tail never exiting, but that's to be expected ). When I open a
> > filehandle for reading these redirected log files however, my callback
> > I passed to add_watch() gets called in a busy loop, and nothing else
> > happens. I assume I'm just doing something simple wrong? What is that
> > thing? :) Thanks ...
>
> The _watch_cmd() sub in gscan2pdf does what you want - uses
> Glib::IO->add_watch() on stdout and stderr and triggers a callback on
> every line read:
>
> https://sourceforge.net/p/gscan2pdf/code/ci/master/tree/lib/Gscan2pdf/Frontend/CLI.pm#l504

Thanks for the response Jeff ... but the example you linked is very
similar to what I have ( in another codebase ) that works. ie I don't
have problems with this method when *forking* a process - it works
really well. I have problems with this method when I want to tail ( or
use Glib::IO->add_watch() on ) STDOUT & STDERR of the *current*
process.

Dan