This script and program work at all levels of AIX.
This backend is a combination of two programs.
This program was written as an illustration in response to a question regarding writing print backends as a shell script and obtaining the job number. Similar questions have also been asked about obtaining the user ID.
The shell script that is provided as an example does not actually print the file, but gathers information about the queue. To add printing capability, you could call one of the standard AIX print commands to print to a separate queue, possibly supplying new print flags. If you are using a local printer, the FILE = parameter in the queue stanza in /etc/qconfig will become a standard out to the script. For this reason, you could simply use the cat command to send the file to the port once you have processed the output.
Some of the things that you should keep in mind when writing the script are that the last parameter passed to the script by the qdaemon is the print file. The flags prior to this that will be treated are the actual print flags passed by enq. The script prints all of the flags to the file /tmp/queue_name in the statement:
echo $* >> /tmp/$QThe C program is called in the line:
FT=`/usr/local/bin/getqinfo`The parameters are returned in the shell array FT.
Create the following file as /usr/local/bin/subque. This file must have execute permissions and should be owned by group printq.
#!/usr/bin/sh
# This is the printer backend file. It is just a shell for now, so look
# in the /tmp file that is pointed at by the name in /etc/qconfig.
# /etc/qconfig line format:
# backend = /usr/local/bin/subque /tmp/log.file
#REMEMBER: what we put into /etc/qconfig always gives the queue name first
# In other words when we make the queue, put a queue name after the backend.
Q=$1; shift
# For debug purposes you can echo some variables to a file
echo "============================ \c" >> /tmp/$Q
/usr/bin/date >> tmp/$Q
echo $* >> /tmp/$Q
# This code gets the USER name and TITLE for the original file
# This is used to log the information, but also to get the info
# needed to pass this on to the next queue with an 'enq -T and -Z'
# see example later.
FT=`/usr/local/bin/getqinfo`
integer j=0
typeset fr
for ft in $FT
do
fr[j]=$ft
let j=j+1
done
echo "From = ${fr[0]}" >> /tmp/$Q
echo "Title = ${fr[1]}" >> /tmp/$Q
echo "Job # = ${fr[2]}" >> /tmp/$Q
echo STOP >> /tmp/$Q
exit 0
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The details of this program are similar to the information in the technical document Basic AIX Printer Backend Program Example.
The key feature of this program is that it calls the library routing log_init() to set up the queue information. The output is returned to the shell script by printing to stdout. When compiling the program, you must link in the libqb library with the cc flag -lqb.
This is a short example:
/* This is getqinfo example header maker */
/* Compile with cc -o getqinfo -lqb getqinfo.c */
/* It doesn't do anything to the data, but
shows how to get at the information and use
the routines */
#include <stdio.h>
#include <IN/backend.h>
#include <IN/standard.h>
#include <string.h>
char *qdate;
char *cmdline;
char *to;
char *devname;
char *title;
char *qname;
char *qdname;
char *from;
char *at;
char *enqflags;
int mail_only;
int jobno;
main(argc,argv)
unsigned argc;
char **argv;
{
int rc, i, c;
char* pfile;
FILE *pf;
/* This is an obligatory routine for getting access to
all the other routines - log_init */
rc = log_init();
if (rc == -1)
{
/* So we see something if log_init fails - Output Error */
printf("ERROR\n");
exit(1);
}
else
{
/* Some of the standard backend subroutine calls are */
/* Then are described in info explorer */
from = get_from();
title = get_title();
jobno = get_job_number();
/* Return information to shell script */
printf("%s %s %d\n",from,title,jobno);
}
exit(0);
}
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The smit page shown below is from AIX 4, but a similar screen
appears at AIX 3.2 when you are adding a queue with smitty spooler.
other User Defined Backend
* Name of QUEUE to add [testq] * Name of QUEUE DEVICE to add [testd] * BACKEND PROGRAM pathname [/usr/local/bin/subque q.log] ACTIVATE the queue? yes Should this become the DEFAULT queue? no Queuing DISCIPLINE first come first serve ACCOUNTING FILE pathname [] HOSTNAME of remote server [] Name of QUEUE on remote server [] Pathname of the SHORT FORM FILTER for queue [] status output Pathname of the LONG FORM FILTER for queue [] status output BACKEND OUTPUT FILE pathname [/dev/testl] |
View the /etc/qconfig file with view /etc/qconfig. The queue should look like this in /etc/qconfig.
testq:
device = testd
up = TRUE
testd:
file = /dev/testl
backend = /usr/local/bin/subque q.log
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Next, print to the queue:
After you ran the preceding print command, a print of the test file showed:
================== Mon Jan 13 13:26:31 CST 1997 /usr/local/bin/subque log.file /etc/motd START /etc/motd 1 From = root Title = /etc/motd Job # = 188 STOP |
#/bin/ksh
# This testpr.sh script is designed to print overlays
# when initiated by HCON, but should also work for other
# types of printing.
#
while getopts :J:L:X:Z:b:ci:j:l:p:f:s:t:u:v:w:x:y:z: arguments
do
case $arguments in
## $OPTARG
X) Xflags="-X $OPTARG" ;;
J) Jflags="-J $OPTARG" ;;
L) Lflags="-L $OPTARG" ;;
Z) Zflags="-Z $OPTARG" ;;
b) bflags="-b $OPTARG" ;;
c) cflags="-c $OPTARG" ;;
f) fflags="-f $OPTARG" ;;
g) gflags="-g $OPTARG" ;;
i) iflags="-i $OPTARG" ;;
j) jflags="-j $OPTARG" ;;
l) lflags="-l $OPTARG" ;;
p) pflags="-p $OPTARG" ;;
s) sflags="-s $OPTARG" ;;
t) tflags="-t $OPTARG" ;;
u) uflags="-u $OPTARG" ;;
v) vflags="-v $OPTARG" ;;
w) wflags="-w $OPTARG" ;;
x) xflags="-x $OPTARG" ;;
y) yflags="-y $OPTARG" ;;
z) zflags="-z $OPTARG" ;;
\?) ;;
esac
done
((current_position = OPTIND -1))
shift $current_position
date >> /tmp/flags.out
############### Call C code to get queue info ###################
FT=`/usr/local/bin/getqinfo`
integer j=0
typeset fr
for ft in $FT
do
fr[j]=$ft
let j=j+1
done
echo "From = ${fr[0]}" >> /tmp/flags.out
echo "Title = ${fr[1]}" >> /tmp/flags.out
echo "Job # = ${fr[2]}" >> /tmp/flags.out
echo "Number of files to print $#" >> /tmp/flags.out
echo "Filenames were: $*" >> /tmp/flags.out
# Use the -c option so we don't lose the file in the next queue
#qprt -c -Ppcl -Z! -p14 -f2 -dp -z+ -v8 $*
enq -Ban -c -Ppcl -o-Z! -o-p14 -o-fp -o-z+ -o-v8 -T ${fr[1]} -Z ${fr[0]}
sleep 2
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[ Doc Ref: 91790919311402 Publish Date: Feb. 13, 2001 4FAX Ref: 6437 ]