[Openais] [PATCH][corosync] Return CS_ERR_INTERRUPT to library users

[Chrissie Caulfield]

Currently coroipcc detects EINTR returns from poll() etc and simply
retries the operation without informing the clients.

I think the clients need to know a signal has been detected. Many
daemons trap SIGINT to help them shutdown cleanly, and this used to
work. Now they get the signal delivered but calls like quorum_dispatch()
do not return so they can't tidy up and close down.

This patch changes the behaviour so that if EINTR is detected it is
passed back to the clients as CS_ERR_INTERRUPT. The clients can then
retry the operation or exit as they see fit.

-- 

Chrissie
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