It would be most useful for some of my applications to be able to know
the IP address of a client before calling accept(2), and to be able to
cancel that connection event without needing to accept(2) and close(2)
it.

I noticed that this feature is usually implemented differently on
various unix operating systems.  I verified if getsockopt(2) supported
an SO_GETADDR but it doesn't.  I am wondering if MSG_PEEK, or SCM_CREDS,
could provide a way to do this through ancillary data with recvmsg(2)?  I
haven't looked at the code yet, thought I would ask first if anyone
knows...

Also, if MSG_PEEK worked, how would I unqueue the event instead of
calling accept(2) if needed?

Thanks,
Matt

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