Date: Tue, 6 Aug 2002 14:50:44 -0400 (EDT)
   From: Lex Stein <stein@eecs.harvard.edu>

   On POSIX compliant systems, dup() does not, in fact, create a new
   vnode for a file.  It merely creates a new file descriptor table
   entry (in the process's in-kernel descriptor table) that points to
   exactly the same vnode.  The two descriptors share the same
   buffered blocks in the global buffer cache.
The problem I was alluding to is a local (inside the Caml process)
buffering one: the Caml runtime doesn't use C stdio, and has its own
buffering scheme.  As the original poster told us about FILE * and
channels, I assumed he would mix I/O on channels and FILE * pointing
to the same file.  Then he has to be cautious.

Bruno.
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