From: Nathaniel Talbott <nathaniel@...>
Date: 2003-08-07T22:12:45+09:00
Subject: Re: More on DRB & OpenSSL

why the lucky stiff [mailto:ruby-talk@whytheluckystiff.net] wrote:

> For some reason the IO.select in openssl/buffering.rb is 
> stalling.  It looks to be a problem in ossl.c.

From looking at the code in ossl.c, I thought the problem might be in
SSL_read, or the use of it. The documentation
(http://www.openssl.org/docs/ssl/SSL_read.html) seemed to be about as clear
as mud about how that function works, though.


> You can solve the problem for now by providing IO.select with 
> a timeout. I'm using 1.5 seconds below.  (see following patch).

This is excellent! I didn't know you could provide a timeout to IO#select.
Now I can actually deploy my code. Thanks!


> It's stopping on an IO#select on the 482nd iteration hitting 
> IO.select. This means that there is a current limitation in 
> the OpenSSL module of 481 * BLOCK_SIZE.  It looks to me like 
> the Buffering module works fine, leaving the underlying 
> sysread, IO functions in ossl.c under inspection.
> 
> Oh, and this problem is affecting the client only.

That's what I observed as well.

How do you find time to write about all that's cool in Ruby 1.8.0, work on
YAML/Syck, research OpenSSL problems, and the million other things I'm sure
you do? :-)

Thanks,


Nathaniel

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