[Catalyst] how do i "truss" an catalyst FCGI worker process?

[Vladimir Timofeev]

Hi

On Wed, Oct 29, 2008 at 14:50, Oleg Pronin <syber.rus at gmail.com> wrote:
> Hi.
>
> I need to inspect my fcgi process, so i tried to do
> truss -p <fcgi_worker_pid>
> But fcgi process immediately exits when "truss" just starts.
>
> Does anyone know why does it happen and how to get it to work?

According to ptrace(2) used by truss:

  For the duration of the tracing session, the traced process will be
  ``re-parented'', with its parent process ID (and resulting behavior)
  changed to the tracing process.

And child exit after processing first request, because it's thinking
that manager die
(see FCGI::ProcManager pm_post_dispatch sub).

May be, for only debugging reason, you can temprorary off this check?

>
> Please anybody, try to do
> truss -p <fcgi_worker_pid>
> on standalone (not in apache) fcgi catalyst server.

Of course this work ;-)

>
> Thanks.
>
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