Spooler Programmer's Guide

Sample Print Process
Spooler Programmer’s Guide—522287-002
A-10
! control is passed back to MAIN^LOOP. When the return
! code value is <> 0 (negative return code), the spooler
! supervisor is notified of the error and the job will be
! terminated.
!- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PROC read^and^print (page^num, device);
INT page^num,
.device;
BEGIN
LITERAL end^of^file = %12000,
end^of^copy = %12001,
control^found = %12003,
setmode^found = %12004,
next^line = 0;
INT write^count, ! number of bytes to be written
error,
wait^needed; ! Set true when we need to return.
!---Beginning of code--------------------------------------------------
next^copy:
IF header^index THEN
BEGIN
IF header^index = 1 THEN
BEGIN
! Issue CONTROL to IOP print process
CALL CONTROL (dev^fnum, 1, 0);
IF <> THEN ! check CONTROL condition code
BEGIN
! CONTROL was unsuccessful
suspend := 1;
suspended := 1;
CALL FILEINFO (dev^fnum, error);
msg^type := IF successful^op THEN
dev^error^1
ELSE
dev^error^5;
CALL tell^super ( msg^type, device,
device^file^error + error);
successful^op := 0;
END
ELSE
! CONTROL was successful
successful^op := 1;
header^index := header^index + 1;
END
ELSE
CALL build^header;
END
ELSE
! Get either first or next line of spooled data
DO
BEGIN
wait^needed := 1;
error := PRINTREAD (job^buffer, data^line, max^read^count,
count^read, page^num);
IF error THEN
BEGIN
CASE error - end^of^file OF
BEGIN
!-12000- end of file found