From: "Nicolas Desprès" <nicolas.despres@...>
Date: 2006-03-24T19:41:02+09:00
Subject: Re: require 'tk' SEGV with Ruby embedded in C

On 3/24/06, Nicolas Despr�s <nicolas.despres@gmail.com> wrote:
> On 3/24/06, Nicolas Despr�s <nicolas.despres@gmail.com> wrote:
> > I'm having trouble trying to embed Ruby in a C program.
> >
>
> Patching the program this way, solve the problem:
>
> > $ cat test.c
> > #include <ruby.h>
> >
>
> EXTERN VALUE rb_progname;
> EXTERN VALUE rb_argv0;
>
> > int main()
> > {
> >   ruby_init();
> >   ruby_script("test");
>   rb_argv0 = rb_progname;
> >   ruby_init_loadpath();
> >   rb_eval_string("require 'tk'");
> >   return 0;
> > }
>
> I'm looking for a cleaner solution.
>

Indeed the problem comes from the tcltklib.c line 7932 and the program
fails since rb_argv0 is not initialized. I think the ruby_script
function should have initialized it since this function initializes
rb_progname and ruby_sourcefile.

Using ruby_options also solves the problem but ruby_options reads
stdin if no arguments are given and in fact I don't want to give
arguments since I just want to use ruby as a library. Finally, when I
look at ruby_process_options (called by ruby_options) I saw these two
lines at the beginning:

ruby_script(argv[0]);       /* for the time being */
rb_argv0 = rb_progname;

I'm wondering why the second statements is not included in the
ruby_script function. If it were, it may have saved me a lot of time
by avoiding me the problem I mentioned above.

Any further commentaries about this issue is welcome,

Best regards,

--
Nicolas Despr�s