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To: alto_stan@wanadoo.be
Cc: Neil Jerram <neil@ossau.uklinux.net>,  guile-gtk@sources.redhat.com,
	  guile-user@gnu.org
Subject: Re: general debugging question + Segfault in guile-gtk
References: <5.1.1.6.0.20021121085949.03260e08@pop.wanadoo.be>
	<87d6oxfi6t.fsf@zagadka.ping.de>
	<20021128093703.1fe573c2.alto_stan@wanadoo.be>
	<m31y56t5ta.fsf@laruns.ossau.uklinux.net>
	<20021128184234.5c3bc15b.alto_stan@wanadoo.be>
From: Daniel Skarda <0rfelyus@ucw.cz>
Date: Thu, 28 Nov 2002 14:37:00 -0000
In-Reply-To: <20021128184234.5c3bc15b.alto_stan@wanadoo.be> (Stan Pinte's
 message of "Thu, 28 Nov 2002 18:42:34 +0100")
Message-ID: <m01y55nx0s.fsf@hobitin.ucw.cz>
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Stan Pinte <alto_stan@wanadoo.be> writes:
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 1024 (LWP 1112)]
> 0x4039c174 in sgtk_arg_cleanup (a=0xbfffe64c, obj=0x2174) at guile-gtk.c:2026
> 2026          if (BOXED_INFO (obj)->cleanup)
> (gdb) bt
> #0  0x4039c174 in sgtk_arg_cleanup (a=0xbfffe64c, obj=0x2174) at guile-gtk.c:2026

   Oops, thats my code, fresh new code.... Mea culpa.

   Aha! 0x2174 is #f (SCM_BOOL_F) (no, I am not a wizard, I am using gdb.... :-)

   GuileGtk converts callbacks parameters to scheme types (according to
information from Gtk). Than it tries to clean-up data - and I forgot that
structures can also be converted to #f (which is not a boxed type).

      if (BOXED_INFO (obj)->cleanup)

   should be replaced by

      if (BOXED_P (obj) && BOXED_INFO(obj)->cleanup)

   Hope that this stops your problems. I am going to commit the fix to CVS ASAP.

Thank you for bug report,
0.