at_exit

/*
 *  call-seq:
 *     at_exit { block } -> proc
 *  
 *  Converts _block_ to a +Proc+ object (and therefore
 *  binds it at the point of call) and registers it for execution when
 *  the program exits. If multiple handlers are registered, they are
 *  executed in reverse order of registration.
 *     
 *     def do_at_exit(str1)
 *       at_exit { print str1 }
 *     end
 *     at_exit { puts "cruel world" }
 *     do_at_exit("goodbye ")
 *     exit
 *     
 *  <em>produces:</em>
 *     
 *     goodbye cruel world
 */

static VALUE
rb_f_at_exit()
{
    VALUE proc;

    if (!rb_block_given_p()) {
        rb_raise(rb_eArgError, "called without a block");
    }
    proc = rb_block_proc();
    rb_set_end_proc(call_end_proc, proc);
    return proc;
}