[plt-scheme] select() and syscalls

I'm curious... does PLT Scheme support POSIX 'select'?  All I can find are
Vyzo's 'socket' package and Matthew Flatt's mention of 'object-wait' 7 years
ago: http://www.cs.utah.edu/plt/mailarch/plt-scheme-2002/msg00521.html (Yes,
I'm interested in SCSH for PLT :-)

In general, do I need to write C extensions to do syscalls, or is there a
better way?

Thanks,
Tom
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