On Fri, Sep 4, 2009 at 4:57 PM, Michael Burk<burkml AT gmail DOT com> wrote:
> Thanks again for your help. Here's the output of the test prog:

Looks just like it does locally.  If the test had managed to reproduce
this failure, then I would have expected to see
  write: Resource temporarily unavailable

That means something deeper is going on here.

> And here's the output after the patch change (again with the 0831 snapshot):

And this shows me that, as far as the kernel is concerned, O_NONBLOCK
is not set on the file descriptor even on the first call.

Since my test program hasn't replicated the error, I think we should
explore a bit more before going to the openbsd lists.  What I'd like
to put together is a patch to amandad and sendbackup that posts a
debug message about every dup(), dup2(), pipe(), fcntl(), and close()
operation that they perform.  I'll whip that up and send it along in a
few minutes.

Dustin

-- 
Open Source Storage Engineer
http://www.zmanda.com