[MLton] filedes = int (was: Stack size?)

[Stephen Weeks]

> I certainly agree that we don't want to duplicate the code in the
> libc section of sleep.  I just don't think that there is a good
> reason to pitch the fractional-second part of the sleep so-called
> system call.  nanosleep is also in Posix.  I couldn't see what
> section, but that was enough to tell me that it would be ok to just
> call nanosleep() (no other computation, just converting the
> Time.time arg to the struct timespec).

This makes sense, and weakens my feeling, but I still lean toward
calling sleep.  I'm interested to hear other opinions.