valid_override(4)         Driver Applies        valid_override(4)

NNAAMMEE
       valid_override - controls the use of efun::

SSYYNNOOPPSSIISS
       int valid_override( string file, string efun_name );

DDEESSCCRRIIPPTTIIOONN
       Add valid_override to master.c in order to control the use
       of the efun:: prefix.  The valid_override function in mas-
       ter.c will be called each time the driver attempts to com-
       pile  a  function  call  that  begins  with  efun::.    If
       valid_override  returns  0,  then  that compile will fail.
       Thus valid_override provides a way to modify the  behavior
       of  efuns  that isn't circumventable via the efun:: prefix
       (by having a simul_efun of the same name as the efun to be
       modified   and   having   valid_override   disallow   that
       simul_efun from being overriden).

       If you wish to have the original  3.1.2  efun::  behavior,
       simply add a line to master.c that looks like this:

          int valid_override(string file, string efun) { return
              1; }

       Here is an example valid_override that  is  more  restric-
       tive:

         int
         valid_override(string file, string name)
         {
             if (file == "/adm/obj/simul_efun") {
                 return 1;
             }
             if (name == "destruct")
                 return 0;
             if (name == "shutdown")
                 return 0;
             if (name == "snoop")
                 return 0;
             if (name == "exec")
                 return 0;
             return 1;
          }

AAUUTTHHOORR
       Truilkan@Basis

SSEEEE AALLSSOO
       valid_object(4), function_exists(3)

MudOS                       5 Sep 1994                          1