This file is indexed.

/usr/share/Yap/pl/protect.yap is in yap 5.1.3-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/*************************************************************************
*									 *
*	 YAP Prolog 							 *
*									 *
*	Yap Prolog was developed at NCCUP - Universidade do Porto	 *
*									 *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997	 *
*									 *
**************************************************************************
*									 *
* File:		protect.yap						 *
* Last rev:								 *
* mods:									 *
* comments:	protecting the system functions				 *
*									 *
*************************************************************************/

% This protects all code from further changes
% and also makes it impossible from some predicates to be seen
'$protect' :-
	current_atom(Name),
	atom_codes(Name,[0'$|_]),
	'$hide_predicates'(Name),
	'$hide'(Name).
'$protect' :-
	'$hide_predicates'(bootstrap),
	'$hide'(bootstrap).
'$protect'.

'$hide_predicates'(Name) :-
	'$current_predicate_for_atom'(Name, prolog, P),
	'$hide_predicate'(P,prolog),
	fail.
'$hide_predicates'(_).

% hide all atoms who start by '$'
'$hide'('$VAR') :- !, fail.			/* not $VAR */
'$hide'('$dbref') :- !, fail.			/* not stream position */
'$hide'('$stream') :- !, fail.			/* not $STREAM */
'$hide'('$stream_position') :- !, fail.		/* not stream position */
'$hide'('$hacks') :- !, fail.		/* not stream position */
'$hide'(Name) :- hide(Name), fail.