From: Eric Hodel <drbrain@...7.net>
Date: 2011-02-03T09:29:48+09:00
Subject: Re: How to know the exit status within at_exit() block?

On Feb 2, 2011, at 06:34, Iñaki Baz Castillo wrote:
> You are right, however I've realized that in case of exiting without
> invoking "exit" or "exit!" (i.e. exiting due to a signal) then $! is
> not a SystemExit instance, but an Interrupt instance (and it doesn't
> have "status" method).
> 
> For example:
> 
> --------------------
> at_exit { p "$!.inspect = #{$!.inspect}" }
> 
> sleep 10
> --------------------
> 
> If you run this program and press Ctrl+C prior to 10 seconds you get:
> 
>  "$!.inspect = Interrupt"
> 
> So, at_exit block is executed but $! is not a SystemExit instance. I
> could trap the signals however.

Yes,

if SystemExit === $! then … end