From the NannyMUD documentation

LAST CHANGE

2001-08-12

FUNCTION

NAME
        _acl_get - Get the acl rights for a directory.


SYNTAX
        mixed *_acl_get(string path)

DESCRIPTION
        Given a valid path to a directory or file, returns an array
	with three parts:
        first : Zero, or where the acl was found.
        second: The numeric value of the rights for $REST.
        third:  An array of arrays of the form:
          ({ ({ "object" : rights }),
             ({ "object" : rights }),
             ...
             ({ "object" : rights }) 
          })

        In the case the given path is an empty string, the priority acl is
        returned.


NOTE
	In the cases of un-readable directories/files, the returned
	value is zero.