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RE: redirecting output

From: Brian
Subject: RE: redirecting output
Date: Thu, 4 Apr 2002 09:26:18 -0600

okay, here's what I tried to do

first, in C, I defined a a guile routine that returned the file descriptor
that I want to use:

scm_c_define_gsubr( "get-my-descriptor"  , 0, 0, 0, (SCM (*)())

this just returns a file descriptor to a file that I have already opened so
that I can write log messages out to.

then in a scm file that I load at initialization I tried doing this:

; myinit.scm

(define fd (get-my-descriptor))
(define p (fdes->outport fd))

(display "*** got descriptor ***" p)
(newline p)
(force-output p)

I expected/hoped that the "*** got descriptor***" would be written to the
file that I had previosly opened in my app.  But all that happened is my app
app crashed with no signs of my message being written.

One other thing.  When I get the file descriptor that my application is
using, it returns 3.  Which is the same file descriptor that I see in
scm_fdes_to_port when myinit.scm file is opened.  It appears that I have two
different files assigned to the same file descriptor.  Why this is or if
it's important, I don't know.

Am I missing something here??


> -----Original Message-----
> From: address@hidden [mailto:address@hidden
> Behalf Of Christopher Cramer
> Sent: Wednesday, April 03, 2002 2:07 PM
> To: Brian
> Cc: address@hidden
> Subject: Re: redirecting output
> On Wed, Apr 03, 2002 at 01:28:08PM -0600, Brian wrote:
> > I'd like to direct guile output to a known C file descriptor.
> Can this be
> > done??
> Use fdopen and set-current-ouput-port. For example:
> address@hidden:~$ guile 3> temp.txt
> guile> (set-current-output-port (fdopen 3 "w"))
> guile> (display "hello there") (newline)
> guile> (quit)
> address@hidden:~$ cat temp.txt
> #<output: standard output /dev/pts/1>
> hello there
> address@hidden:~$
> --
> Christopher Cramer <address@hidden> <>
> Quoi que vous fassiez, écrasez l'infâme, et aimez qui vous aime.
>       -- Voltaire
> _______________________________________________
> Guile-user mailing list
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