From: Jared Richardson <jaredRMV-richaTHSrdson@...>
Date: 2006-03-25T10:58:53+09:00
Subject: Re: C extensions question

Also, I forgot to add, in order for this to work, invoke with these options:

ruby -r mkmf 
xtconf.rb  --with-ingres-include="/opt/Ingres/IngresII/ingres/files/" --with-ingres-lib="/opt/Ingres/IngresII/ingres/lib/"


"Jared Richardson" <jaredRMV-richaTHSrdson@nc.rr.com> wrote in message 
news:Yi1Vf.44009$915.14388@southeast.rr.com...
>I finally got this thing working so I thought I'd share the answer, even 
>though it was a simple problem (once I found it.) :)
>
> I was already generating my Makefile with extconf.rb but I hadn't gotten 
> it to answer "yes" to any of the have_library or find_libary calls. I did 
> have it working for have_header. I should've focused on that have_library 
> that answered "no", but I thought that since the original C samples could 
> run with the libraries in the LD_LIBRARY_PATH environment variable that 
> the Ruby code would be okay. It wasn't. :)
>
> It turns out that I wasn't using the right library name. The include was 
> called "iiapi.h" and the compiled library was named libiiapi.a (static) 
> and libiiapi.1.so (dynamic). However the name of the library seems to be 
> "ingres". I'm pretty sure I tried using "ingres" early in the debugging 
> cycle, but it appears that either I didn't or that I had the environment 
> messed up at the time.
>
> I haven't done anything "real" with the resulting code yet, but I can call 
> into the ingres library without a segmentation fault, so I'm going to call 
> it good and go take a break. :)
>
> I'm pasting in my extconf.rb for future reference.
>
> -----
> require 'mkmf'
>
> dir_config("ingres")
> have_header("iiapi.h")
> have_library("ingres")
>
> $CFLAGS = " -g -Dint_lnx -O "
> incdir = ENV["II_SYSTEM"] + "/ingres/files"
> $CFLAGS += "-I#{incdir}"
> libdir = ENV["II_SYSTEM"] + "/ingres/lib"
> $LDFLAGS += "-L#{libdir}"
> $LDFLAGS += " -lingres -lpthread -lm -lc -lcrypt -ldl -lgcc_s"
>
> create_makefile("Ingres")
> -----
>
> Thanks for the suggestions and help.
>
> Jared
> http://jaredrichardson.net
>
>
> --------------------------
> --- Original Message ----
> --------------------------
>
>
> Hi all,
>
> I haven't done any "real" work in C in nearly 10 years and I'm still
> learning Ruby, so it's quite possible that I'm just doing something dumb,
> but I'm stuck here. I'm trying to call Ingres database code from Ruby, so
> I'm writing some C extensions.
>
> I have Ruby calling into C code. Very easy and very nice.
>
> I have Ingres sample code (which is C) compiling and running fine.
>
> However, when I try to invoke Ingres code from any of my C code and run it
> (from Ruby), I get a seg fault.
>
> It feels like Ruby can't see the Ingres libraries but the code samples 
> don't
> seem to having any problems. I suspect I'm missing something simple...
>
> Do you need to do any special wrapping or declaring of code that isn't
> touched from within your Ruby? I've been through the Pickaxe book and
> several online samples/tutorials and I don't see that it's needed... but
> then again, my code isn't running. :)
>
> Here's my code as it is now... any hints or clues?
>
> #include "ruby.h"
> # include <stdio.h>
> # include <iiapi.h>
>
> static VALUE cIngres;
>
> static VALUE ii_exec(VALUE self) {
> printf("\n\nExec was run from within the Ruby code \n\n");
>  IIAPI_INITPARM  initParm;
>  printf("one\n");
>  IIapi_initialize( &initParm );
>  printf("two\n");
> return Qnil;
> }
>
> void Init_Ingres() {
> cIngres = rb_define_class("Ingres", rb_cObject);
> rb_define_method(cIngres, "exec", ii_exec, 0);
> }
>
>
> Thanks!
>
> Jared
> http://jaredrichardson.net
>
>
>