Date: Thu, 27 May 2004 14:38:23 -0500
   From: John Goerzen <jgoerzen@complete.org>

Hi John,
   I tried this example straight from the docs:
    $ cashtop
	    Objective Caml version 3.07+2
	    Camlp4 Parsing version 3.07+2
    # open Cash;;
    # run_with_strings (fun () -> exec_path "ls" []);;
    Exception: Sys_error "Bad file descriptor".
    # Exception: Sys_error "Bad file descriptor".
   I can't make any of the run_with_* that I've tried work, whether in
   my programs or with cashtop.

   Ideas?  (Cash 0.20)
Not a lot with so little info (of course it works here).  Would you
mind sending me more OS details ?  A backtrace would be very useful,
and/or the result of trace/truss/strace -f ?

That said, what comes to mind is that the behavior of close_{in,out}
has changed in Pervasives over the last versions of Caml.  I wrote
some (too many) lines of code to make Cash.close_{in,out} work anyway.
I see in the CVS log that there was a change related to that, some
time after 3.07 (see the attached patch).  You could try it, or even
try the entire CVS version of Cash.

Bruno.