quick hack to check if a program is running in a termianl

gistfile1.vala

// valac --pkg vte-2.90 --pkg gtk+-3.0 test.vala
public class Wind {
    GLib.Pid child_pid;
    public Wind () {
        var w = new Gtk.Window ();
        w.set_size_request (640,480);
        w.destroy.connect (Gtk.main_quit);
        var ter = new Vte.Terminal ();
        var dir = GLib.Environment.get_current_dir ();
        ter.fork_command_full (Vte.PtyFlags.DEFAULT, dir, { Vte.get_user_shell () },
                                            null, SpawnFlags.SEARCH_PATH, null, out child_pid);
        ter.child_exited.connect ( () => {w.destroy (); });
        moni ();
        w.add (ter);
        w.show_all ();
    }

    public void moni () {
        File f = File.new_for_path ("/proc/%d/status".printf (child_pid));
        print ("%s\n".printf (f.get_path ()));
        var monitor = f.monitor_file (FileMonitorFlags.NONE, null);
        monitor.changed.connect (changed);
        print ("Monitoring Started \n");
    }
    private void changed (File f, File? dst, FileMonitorEvent ev) {
            print ("Changed \n");
    }
    public GLib.Pid get_pid () {
        return child_pid;
    }
}

int main(string[] args) {
    Gtk.init (ref args);
    var w = new Wind();
    Gtk.main ();
    return 0;
}