From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-02-02T19:49:56+09:00
Subject: Re: How to know the exit status within at_exit() block?

2011/2/1 Robert Klemme <shortcutter@googlemail.com>:
> You are aware that you can simplify that to
>
> exit SOMETHING
>
> are you?

Yes, but I want to inspect the exit status code into the block
provided to at_exit().


>> Of course I call "exit" from lof of clases/modules under my project so
>> I cannot use a local scope variable "status" (and I wouldn't like to
>> use a global variable).
>
> First of all: IMHO that is bad practice because it prevents your code
> to be used in different situations (i.e. reduces modularity).  The
> proper way would be to raise exceptions and deal with them
> appropriately.  You can even omit the handling on top level and get
> appropriate exit codes of the process (i.e. 0 for the regular case, 1
> for error):
>
> $ ruby19 -e 'raise "f"'; echo $?
> -e:1:in `<main>': f (RuntimeError)
> 1
> $ ruby19 -e 'nil'; echo $?
> 0
> $
>
> However, you can do what you want with a rescue clause:
>
> begin
>  # main code
> rescue SystemExit => e
>  puts "exiting with status #{e.status}"
>  raise
> rescue Exception => e
>  puts "exiting with status 1"
>  raise
> else
>  puts "exiting with status 0"
> end

Using "rescue SystemExit => e" seems indeed appropriate. Let me play a
bit with it.

Thanks a lot.

-- 
Iñaki Baz Castillo
<ibc@aliax.net>