Call function

[Aldrey <aldrey recife pe gov br>]

  I am with a doubt.  I am making the call of a function in this way:
  gtk_signal_connect (GTK_OBJECT(button_down_up), "clicked", \
GTK_SIGNAL_FUNC(call_button_up), field);

  It would like to know as I can catch the value of return to know if I
got success.