Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!mit-eddie!mit-amt!sokolov
From: sokolov@mit-amt (Michael Sokolov)
Newsgroups: comp.lang.lisp
Subject: Re: Interfacing Lucid and C
Message-ID: <3559@mit-amt>
Date: 9 Feb 89 18:20:45 GMT
References: <5296@lifia.imag.fr>
Reply-To: sokolov@media-lab.media.mit.edu (Michael Sokolov)
Organization: MIT Media Lab, Cambridge MA
Lines: 14

Re: FILE / stream connection.

Try using the lisp function "extract-stream-handles." I believe 
that this returns the file descriptor (not FILE pointer). Then you could 
use UNIX "read" command instead of getchar. I don't think Lucid makes 
a FILE pointer. 

As far as passing general structures back and forth, there is a not-very-
pretty way to do it, which is to call the structure an array of type 
'(unsigned-byte 32) in lisp, and a structure in C. Then you can access
the elements of a C structure from Lisp if you know the correct
offsets into the structure...

-MS