Make sockets non-blocking

[Stephen Gran]

Hi there,

We use NDO for network communication with a custom bit of perl to pass
status updates around.  Recently, we've seen that a network flap can
make ndo hang the entire nagios process, which is possibly imperfect :)

I think I've tracked it down to the write() call in io.c when sending
the actual update to the remote server.  The attached patch is a
relatively naive attempt at making this write nonblocking for network
sockets.

This is a patch against the CVS - if you prefer a git-am style patch,
that's fine.  I tried to clone the git off of sourceforge this morning,
and got an empty repo.  If there's a better place to clone from, let me
know and I'll fix it up for that.

Cheers,
-- 
 --------------------------------------------------------------------------
|  Stephen Gran                  | You have a will that can be influenced  |
|  steve at lobefin.net             | by all with whom you come in contact.   |
|  http://www.lobefin.net/~steve |                                         |
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