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UGH...
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We need to do this for apps that depend on things like the
sendfile() optimizations in Rainbows!
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This is the highest number a counter may be incremented to
before it overflows.
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This returns a Raindrops::TCP_Info object
that wraps a tcp_info struct.
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Since Unicorn and Rainbows! support IPv6 now, it makes sense to
support the rfc2732-style addresses it returns.
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inet_diag already supports AF_INET6.
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Modern glibc can easily return the L1 cache line size with
sysconf(3), so we'll use that and avoid paying a size penalty on
CPUs with smaller cache lines than 128 (every modern x86 except
the idiotic P4).
Additionally, if we detect a single CPU machine, avoid paying
any padding penalty at all.
On machines without the non-portable glibc sysconf(3)
enhancements, we'll continue to operate on the assumption
of an enormous 128 byte cache line size.
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It's not pretty...
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