EMS Manual

Compiled Filters

EMS Manual—426909-005

5-4

Creating a Compiled Filter

Loading Standard Definitions

You must load the standard definitions of SPI and of each subsystem whose tokens

you use. These TACL statements load the standard definitions for SPI and EMS:

#PUSH dummy

#LOAD /KEEP 1, LOADED dummy/ $SYSTEM.ZSPIDEF.ZSPITACL

#LOAD /KEEP 1, LOADED dummy/ $SYSTEM.ZSPIDEF.ZEMSTACL

#POP dummy

You could also use this ATTACHSEG TACL command:

ATTACHSEG SHARED $SYSTEM.ZSPISEGF.ZxxxTACL :Zxxx

#SET #USELIST [#USELIST] :Zxxx

where Zxxx is either ZSPI or ZEMS.

If your site places the standard definition files on another volume, change $SYSTEM to

the name of the other volume.

You can enter these TACL statements, exactly as shown, at the TACL that runs the

filter compiler. You can also include the TACL statements in the filter specification if you

surround each statement with brackets.

For information on how to create and attach a TACL segment file—a fast way to save

and restore standard definitions—see the TACL Reference Manual.

Compiling a Filter Specification

After you have loaded the standard definition files that your filter requires, you can

compile the filter.

To compile the filter specification shown in Sample Filter Specification

on page 5-3 (in

EDIT file FWDFLT) and to place the compiled filter in object file OFILTER, enter this

TACL command:

EMF / IN FWDFLT / OFILTER

The compiler listing is:

EMS Filter Compiler - T9634C00 - (15JUL87) - (19JUN87)

1 FILTER forward^only^local^events;

2 BEGIN

3 IF ZEMS^TKN^SYSTEM = 116 THEN

4 PASS

5 ELSE

6 FAIL;

7 END;

Object file name is $HUBS.MYSUB.OFILTER

Caution. Always re-create TACL segment files that save standard definitions whenever your

site installs a new release of the programmatic interface. Using private copies of such files can

cause errors if they are not kept current.