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<TITLE>LambdaMOO Programmer's Manual - Restricting Built-ins</TITLE>
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<H3><A NAME="SEC73" HREF="ProgrammersManual_toc.html#TOC73">Restricting Access to Built-in Properties and Functions</A></H3>

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Whenever verb code attempts to read the value of a built-in property <VAR>prop</VAR>
on any object, the server checks to see if the property
<CODE>$server_options.protect_<VAR>prop</VAR></CODE> exists and has a true value.  If so,
then <CODE>E_PERM</CODE> is raised if the programmer is not a wizard.

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Whenever verb code calls a built-in function <CODE><VAR>func</VAR>()</CODE> and the caller
is not the object <CODE>#0</CODE>, the server checks to see if the property
<CODE>$server_options.protect_<VAR>func</VAR></CODE> exists and has a true value.  If so,
then the server next checks to see if the verb <CODE>$bf_<VAR>func</VAR>()</CODE> exists;
if that verb exists, then the server calls it <EM>instead</EM> of the built-in
function, returning or raising whatever that verb returns or raises.  If the
<CODE>$bf_<VAR>func</VAR>()</CODE> does not exist and the programmer is not a wizard, then
the server immediately raises <CODE>E_PERM</CODE>, <EM>without</EM> actually calling
the function.  Otherwise (if the caller is <CODE>#0</CODE>, if
<CODE>$server_options.protect_<VAR>func</VAR></CODE> either doesn't exist or has a false
value, or if <CODE>$bf_<VAR>func</VAR>()</CODE> exists but the programmer is a wizard),
then the built-in function is called normally.

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