[development] Using drupal_access_denied()

[David T]

Hi,

Although I've managed to implement some functionality using Rules, for
various reasons I'd like to shift it to some logic and code in my own
custom module that prevents access to certain pages.

Doing:

function mymodule_preprocess_page(&$vars) {
  if ($some_condition) {
    print "pass";
  } else {
   print "fail";
  }
}

works fine.

If I do:

function mymodule_preprocess_page(&$vars) {
  if ($some_condition) {
    drupal_access_denied();
    exit;
  }
}

I just get a white page (which is a 403 page looking at the header, not a 500).

What do I need to do instead?

Cheers,

David