From: Brian Candler <b.candler@...>
Date: 2008-11-14T17:27:42+09:00
Subject: Re: Unable to rescue Errno::ECONNRESET during

What's interesting is that line 929 of net/imap.rb is in the backtrace:

    def receive_responses
      while true
        begin
          resp = get_response             # line 929
        rescue Exception
          @sock.close
          @client_thread.raise($!)
          break
        end

It looks like the exception should be caught here, and explicitly 
re-raised in another thread from line 932. You could try adding some 
STDERR debugging before and after the get_response line, and inside the 
rescue Exception clause.

Maybe "@sock.close" should be "@sock.close rescue nil" in case another 
exception is raised then. But line 931 isn't in the backtrace.

Raising and catching the exception in another thread ought to work as 
far as I can see:

class Foo
  def initialize
    t = Thread.current
    Thread.start do
      t.raise Errno::ECONNRESET
    end.join
  end
end

begin
  f = Foo.new
rescue Errno::ECONNRESET
  puts "Caught it: #{$!.backtrace.join("\n")}"
end
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