Re: gEDA-user: gnetlist quitting after execl call

[John Doty <jpd@xxxxxxxxx>]

On Sep 6, 2010, at 1:08 PM, Oliver King-Smith wrote:

>   I am extending gnetlist and I dislike scheme.  To work around this I
>   wrote a little program in C++ to do the heavy lifting and I am trying
>   to call it from my scheme extension to gnetlist.
>   I wrote the following function in scheme:
>   (define magic:write_nmos_fet
>     (lambda (w l m)
>       (display (string-append "in write_nmos_fet " (number->string w)
>   "\n") )
> 
>       (execl "/sw/share/gEDA/scheme/subfunction" " --m=" (number->string

There's your problem: (execl) is not like a call. It replaces the current process, so it should never return unless something goes wrong. Like execl() in libc.

You probably want (system) or (system*).

>   m)
>              " --w=" (number->string w)  " --l=" (number->string l) "
>   --type=nmos" )
>       (display "Finished C call\n" )
>         ))
>   This works and calls my C++ program (called subfunction right now).
>   The C++ program runs without problems and produces the expected
>   output.  My problem is nothing seems to run in my scheme program after
>   calling subfunction.  For example the line:
>       (display "Finished C call\n" )
>   does not run.  Nothing else appears to run after this.  However there
>   are no error messages.
>   Does anyone have any suggestions as to why this might be?
>   Is there a better way to be calling external programs from gnetlist?
>   Oliver
> 
> 
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John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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