Re: [Perfparse-devel] EXITs

[Yves <yme...@pe...>]

> In an attempt to figure out why the 'kill' does not induce the same
> effect on Nagios, I concluded that the reason is that kill sends a
> SIGTERM to perfparsed, which is nicely handled in log_reader.c. The
> sighandler _closes all log sources_.
> A simple exit somewehere in the application does not, and subsequent
> write attempts to the pipe are hanging (blocked).
>
> Question 1: is my conclusion correct?

I am not sure, but I would say yes.

> Question 2: if so, is there any way you can catch an exit call with a
> signal handler? Or should you use something like raise(SIGxxx) instead
> of exit?

Yes, and it is already implemented.
We use atexit() to catch the exit call.

When you kill the application, there is a signal handling, that only wait=
 for the end of
critical operations before the normal behaviour that is leaving graciousl=
y.

When perfparsed exit, there are places where we cannot work with the atex=
it() registered
functions. So it does not exits with exit() but with _exit(). Maybe this =
is where to
change things ?
But I have a better idea : what about creating our own exit() function, t=
hat call the
functions we register with atexit() ? And don't use exit(), _exit() and a=
texit() at all
?
This is some big development.

Tim and Ben (and others) could you check if what I say is correct ? How m=
uch work it
represents ? If this is not too hard, maybe Bruno and Remi can do it ?
(they have not been introduced yet, but I'm waiting that they manage to i=
nstall nagios
and perfparse : they began 2 days ago).

> (Q3: has anyone else experienced this problem?)

Maybe you should ask nagios mailing-list about this, to know if somebody =
had this
problem and how they solved it ? However, the bug is in perfparse, not in=
 nagios, and it
has to be fixed in perfparse.

Yves
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