From: Brian Candler <b.candler@...>
Date: 2009-01-19T19:31:45+09:00
Subject: Re: Connecting to a running ruby process

Piyush Ranjan wrote:
> Hi!
> Is there any way you can connect to a running ruby process (for instance 
> a
> mongrel) and 'talk' to it like we can do in lisp using slime ?

Try the ruby-debug gem (which is what rails uses). Unfortunately, the 
supplied documentation is pretty poor, but there is a pretty good doc at 
http://bashdb.sourceforge.net/ruby-debug.html

Separate process debugging can be done via rdebug command line flags, or 
by calling Debugger methods explicitly:

$ cat p1.rb
require 'rubygems'
require 'ruby-debug'

Debugger.wait_connection = true
Debugger.start_remote
Debugger.post_mortem

Debugger.breakpoint
a = 1 - 1
b = 2 / a
c = a + b
puts c

$ ruby p1.rb

In another window: rdebug -c to single step, inspect variables etc. in 
the first process.
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