Jeremy Fincher [Tuesday 4 September 2001] :
 >
 > I can't for the life of me figure out how, from C, to take an in_channel and
 > get the file descriptor of it.  How do I write a C function that takes an
 > in_channel and then does some work on the underlying file descriptor?

in the OCaml source tree, look at byterun/io.h : it contains
definitions and macros to access caml channels from C :

 - struct channel has a field fd for the file descriptor.
 - the macro Channel takes a Caml value and gives you a struct
   channel*

so (Channel(ml_channel))->fd does what you want.

There's also the Unix.descr_of_in_channel and
Unix.descr_of_out_channel functions.

			  Olivier
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