win32utils devel - Mar 2008 - Fwd: Is select() untrustworthy on Windows when used with handles from popen3?

Any ideas?

Dan


---------- Forwarded message ----------
From: Steve Shreeve <steve.shreeve at gmail.com>
Date: Thu, Mar 13, 2008 at 10:51 AM
Subject: Is select() untrustworthy on Windows when used with handles
from popen3?
To: djberg96 at gmail.com




Dan,

Thanks for your work on the win32util modules.

I''ve created an expect-like library that allows one to easily script
interactions with non-GUI applications. Everything works great when
connecting to the target system using a socket, or using PTY.spawn on
Linux. On Windows, I get quite a bit of grief. Here''s an example that
has me confused:

d:\>irb
irb(main):001:0> require ''win32/open3''
=> true
irb(main):002:0> i,o,e = Open3.popen3(''date'')
=> [#<IO:0x2b42a4c>, #<IO:0x2b42a24>, #<IO:0x2b42a10>,
3164]
irb(main):003:0> o.sysread(70)
=> "The current date is: Thu 03/13/2008 \nEnter the new date: (mm-dd-yy)
"
irb(main):004:0> select([o],nil,nil,1)
=> [[#<IO:0x2b42a24>], [], []]
irb(main):005:0> o.sysread(1)
# => here, it hangs... even though it *says* there''s input to read
]=
Since we hang at this spot, I''m sorta hosed... how can I trust
select()?

Steve

=
ps - I''d be happy to pay for your time to assist with this.