- major overhaul to make this deal with unlimited fd's. - kill non-FD_SETSIZE code
- major overhaul to make this deal with unlimited fd's.
- kill non-FD_SETSIZE code

Obtained from: a diff of FreeBSD vs. OpenBSD/NetBSD rpc code.

Note, there was a nasty bug with our old code here.  It would trash the
stack if a fd > 31 was passed in.  It was using a "long" as though it
was an "fd_set", ie: it was assuming that a long was 256 bits wide. :-(
This has been lurking here for a while, since the FD_SETSIZE #ifdef's
were first implemented.

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