From: Nathaniel Talbott <nathaniel@...>
Date: 2004-01-16T05:20:04+09:00
Subject: recvfrom(2) error on OS X 10.3.2

I'm working on a new DRb protocol, and intermittently get the following 
error when running the client sample:

   ntalbott@jacob:~/cvs/drbfire$ ruby -v -I lib sample/client.rb
   ruby 1.9.0 (2004-01-15) [powerpc-darwin]
   ./lib/drb/drbfire.rb:213:in `recv': Invalid argument - recvfrom(2) 
(Errno::EINVAL)
         from ./lib/drb/drbfire.rb:213:in `recv_signal_id'
         from ./lib/drb/drbfire.rb:58:in `initialize'
         from ./lib/drb/drbfire.rb:108:in `new'
         from ./lib/drb/drbfire.rb:108:in `open_server'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:728:in `open_server'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:726:in `each'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:726:in `open_server'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:1228:in `initialize'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:1491:in `new'
         from /usr/local/lib/ruby/1.9/drb/drb.rb:1491:in `start_service'
         from sample/client.rb:11

You can get the code to try yourself from:

   http://rubyforge.org/scm/?group_id=160

Using ktrace I discovered this:

   17370 ruby     CALL  
recvfrom(0x3,0x436530,0x4,0,0xbffe60e0,0xbffe64e8)
   17370 ruby     RET   recvfrom -1 errno 35 Resource temporarily 
unavailable
   17370 ruby     CALL  select(0x4,0xbffe6010,0,0,0)
   17370 ruby     RET   select 1
   17370 ruby     CALL  
recvfrom(0x3,0x436530,0xffffffff,0,0xbffe60e0,0xbffe64e8)
   17370 ruby     RET   recvfrom -1 errno 22 Invalid argument

On a successful run, the first call to recvfrom succeeds, so it appears 
that the third argument to recvfrom is being trashed between calls for 
some reason. I think this may be an OS X related problem, as I couldn't 
duplicate the error on either of the other two platforms I tested on 
(Debian Linux and Windows 2000). Any ideas?

Thanks,


Nathaniel

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