From: Eric Hodel <drbrain@...7.net>
Date: 2011-02-05T05:12:37+09:00
Subject: Re: How to know the exit status within at_exit() block?

On Feb 3, 2011, at 4:13 AM, Iñaki Baz Castillo wrote:
> 2011/2/3 Eric Hodel <drbrain@segment7.net>:
>>> 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
> 
> Thanks. I wonder if $! can be anything else apart from SystemExit and Interrupt.

Yes:

$ ruby -e 'at_exit { p $! }'
nil
$ ruby -e 'at_exit { p $! }; raise'
RuntimeError
-e:1: unhandled exception
$