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	Wed, 26 Oct 2005 23:55:36 PDT
Date: Wed, 26 Oct 2005 23:55:36 -0700 (PDT)
From: Rob <spamrefuse@yahoo.com>
To: Igor Robul <igorr@speechpro.com>, freebsd-questions@freebsd.org
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Subject: Re: math/grace port: "libXcursor.so.1.0" not found ?? [SOLVED]
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--- Igor Robul <igorr@speechpro.com> wrote:

> %mkdir tttt
> %cd tttt/
> %cat ~/.grace/gracerc.user
> USE "pow" TYPE f_of_dd FROM "/usr/lib/libm.so"
> %ls
> %xmgrace
> %

OK, great.

Meanwhile, I came closer to the real problem.
You don't need to create the link in /usr/X11R6/lib.

The problem is dlerror(). Whenever one of the
dl-functions is called, it will set the error
indicator in dlerror() in case of problems.

For some unclear reason, the error indicator in
dlerror is set when grace starts-up. I don't
know why yet (I'll discuss that with the grace
mailing list).

When grace uses the dl-functions in src/dlmodule.c,
which is caused by the "USE..." lines in
gracerc.user, something like this happens:

   dlopen("library name", MODE);
   if (dlerror() != NULL) {
      report_error();
      exit(1);
   }

Now, dlerror() is set, but not by dlopen(), but
by some other part at start-up. A workaround is
following:

   /* reset any possible earlier error */
   dlerror();

   dlopen("library name", MODE);
   if (dlerror() != NULL) {
      report_error();
      exit(1);
   }

When I patch grace with this dummy dlerror(),
prior to the dl-function calls, all works like
a charm (and you don't need the link in
/usr/X11R6/lib anymore).

As I said before, I now have to find out why
grace activates the dlerror() at start-up.

Regards,
Rob.


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