gtk+ 2.0 marshaller problems with passing non gpointer variables?

[safemode <safemode speakeasy net>]

I'm having a problem passing structures (well anything non-gpointer) to a 
function called by gtk_signal_connect.  It seems that the argument structure 
is not passed or is somehow re-initialized.  I cant tell.  All i know is that 
the value i get on the called function is always the same (due to nothing 
overwriting the memory).

Note. chosen and chosen2 are global variables of type info which is a 
structure. 
<code snippit>

void test_func(info *chosen1)
{
   printf("old name test: %s\n",chosen1->selected_oldfile);
}

void gtk_interface(int argc, char *argv[])
{
   sprintf(chosen.selected_oldfile,"%s", "/\0");
   sprintf(chosen2.selected_oldfile,"%s","/\0");
   test_func(&chosen);
   gtk_init (&argc, &argv);
<more code>
</code snippit>

Now here, chosen1->selected_oldfile has the correct value when printf'd of "/"
Exactly what i want.  

<code snippit>
void create_file_select(info *chosen1)
{
   printf("old name: %s\n",chosen1->selected_oldfile);
   printf("old name: %s\n",chosen.selected_oldfile);
  <more code>
}
  <code snippit further down in gtk_interface>

       gtk_signal_connect (GTK_OBJECT (button), "clicked",
                        GTK_SIGNAL_FUNC(create_file_select), &chosen);

   </code snippit in gtk_interface>
</code snippit>

Now here just to make sure  chosen.selected_oldfile prints "/" as it should.  
chosen1->selected_oldfile prints "]" no matter what value i initially make 
chosen in gtk_interface.  

So i have to come to the conclusion that either i'm 
A. not getting the procedure you have to do in order to pass a structure 
inside gtk_signal_connect or 
B. the marshaller in gtk 2.0 is retarded when it comes to passing anything 
non gpointer;  

I've tried sending just normal characters and the same thing occurs.  It gets 
an uninitialized pointer to some place in memory.  Not a pointer to the 
variable i'm sending it in gtk_signal_connect.