[Koha-bugs] [Bug 20342] Fix table locking issue, progress bar not updating, and allow use of plack for Stage MARC Import

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20342

--- Comment #21 from David Cook <dcook at prosentient.com.au> ---
The more I think about it... the more I can't see this ever working with a
persistent process.

The only reason it works with CGI is because the parent process is not
persistent / is short lived.

--

In theory, if $SIG{CHLD} were set to IGNORE rather than DEFAULT, then we
possibly wouldn't get zombie processes, but that would need to be set at a
higher level than stage-marc-import.pl I reckon, plus it's not a brilliant
idea, as it would have wider consequences.

--

Looking at https://metacpan.org/pod/CGI::Compile#exit-and-exceptions, I see
that exit() isn't a real exit as well... makes sense. 

If we use CORE::exit(0) instead of exit(0), it actually exits the background
child process, although we still wind up with the zombie process like so:

kohadev+ 69925 69922 10 00:49 ?        00:00:03 starman worker -M FindBin
--max-requests 50 --workers 2 --user=kohadev-koha --group kohadev-koha --pid
/var/run/koha/kohadev/plack.pid --daemonize --access-log
/var/log/koha/kohadev/plack.l
og --error-log /var/log/koha/kohadev/plack-error.log -E development --socket
/var/run/koha/kohadev/plack.sock /etc/koha/sites/kohadev/plack.psgi
kohadev+ 69999 69925 17 00:50 ?        00:00:03 [starman worker ] <defunct>

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