[plt-scheme] FFI - C file handles -> scheme ports

On Jan 14, Hans Oesterholt-Dijkema wrote:
> Eli Barzilay schreef:
> > On Jan 14, Hans Oesterholt-Dijkema wrote:
> >   
> >> Eli Barzilay schreef:
> >>     
> >>> On Jan 14, Hans Oesterholt-Dijkema wrote:
> >>>   
> >>>       
> >>>> Dear All,
> >>>>
> >>>> Is it possible to reuse, or encapsulate C file handles (actually
> >>>> sockets) in a scheme port, using the FFI?
> >>>>     
> >>>>         
> >>> I don't think so.  MzScheme works on a lower level than FILE*.  The
> >>> best way I can think of is to create a custom input or output port
> >>> that uses the C level for its IO.
> >>>
> >>>       
> >> Wouldn't a call to "select" on the C level block mzscheme entirely?
> >>     
> >
> > Yes, you'll need to avoid any blocking C calls.
> 
> Isn't there something like
> 
> ¤ Scheme_Object *scheme_make_fd_input_port(int |fd|, Scheme_Object *|name|,
>     int |regfile|, int |win_textmode|)
> 
> ?
> 
> To use?

Yes you can use that -- but that requires a file descriptor.  By "file
handles" I thought that you meant a FILE* pointer.  (Or maybe you're
asking how to use that function from Scheme?)

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                  http://www.barzilay.org/                 Maze is Life!