Can Unix sleep in terms of mili/micro?

[franck boissiere]

>From article <11899 at chaph.usc.edu>, by tli at phakt.usc.edu (Tony Li):
>     
> BSD derived systems provide usleep(3) which does what you want.  
> 
On some manuals for usleep it is mentionned that you may use select
with no descriptor to use to do the trick.
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