[gambit-list] Process stdout redirection

C K Kashyap ckkashyap at gmail.com
Tue Mar 20 13:54:33 EDT 2018


Got it - so if I have to redirect to a file, I could do this -
(with-output-to-file "output.txt"
  (lambda ()
    (display
     (call-with-input-process
      program
      (lambda (port)
(read-line port #f))))))


Although, I'd like to understand why stdout-redirection: #f outputs to
stdout and not the current output port. Is that a problem?

Regards,
Kashyap

On Tue, Mar 20, 2018 at 8:30 AM, Marc Feeley <feeley at iro.umontreal.ca>
wrote:

> When stdout-redirection: is #f, the output of the process will go to the
> POSIX stdout.
>
> When it is #t, the output of the process will go to the process port, and
> you can read from that port to get the output.
>
> For example:
>
> (define program
>   (list path: "ls" stdout-redirection: #t arguments: (list "-l")))
>
> (pp
>  (call-with-input-process
>   program
>   (lambda (port)
>     (read-line port #f))))
>
> Marc
>
>
>
> > On Mar 20, 2018, at 10:28 AM, C K Kashyap <ckkashyap at gmail.com> wrote:
> >
> > Hello all,
> >
> > I was hoping for this program to redirect the output of the forked
> process into a file -
> >
> > (define program
> >   (list path: "ls" stdout-redirection: #f arguments: (list "-l")))
> >
> > (with-output-to-file
> >     (list path: "output.txt")
> >   (lambda ()
> >     (open-process program)))
> >
> > But that does not seem to happen. I am not sure what I am missing here.
> >
> > Regards,
> > Kashyap
> >
> > _______________________________________________
> > Gambit-list mailing list
> > Gambit-list at iro.umontreal.ca
> > https://webmail.iro.umontreal.ca/mailman/listinfo/gambit-list
>
>
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