3-16

Guide to Printers and Printing

/etc/qconfig Spooler Configuration File

The /etc/qconfig file describes all of the queues defined to the base operating system. A

queue is a named, ordered list of requests for a specific device. A device is something

(either hardware or software) than can handle those requests one at a time. The queue

provides serial access to the device. Each queue must be serviced by at least one device;

often it can be handled by more than one device.

/etc/qconfig File Structure

The /etc/qconfig file is the most important file in the spooler domain:

• It contains the definition of every queue known to the spooler.

• A system administrator can read this file and discern the function of each queue.

• Although it is not recommended, this file can be edited ( Editing the /etc/qconfig File on

page 4-153) to modify spooler queues without halting the spooler.

The qdaemon reads the ASCII version of /etc/qconfig and creates a binary version,

/etc/qconfig.bin. /etc/qconfig must adhere to a specific structured format in order for the

qdaemon to be able to parse it. This format is detailed in the /etc/qconfig File Structure

examples below.

Local Queue

queue_name:

device = device_name

up = TRUE or FALSE

discipline = fcfs or sjn

device_name:

file = physical_device_name or FALSE

header = always or group or never

trailer = always or group or never

access = both or write

backend = full_path_name_to_backend_program

Remote Queue

queue_name:

device = device_name

up = TRUE or FALSE

host = remote_hostname

s_statfilter = full_path_to_short_filter

l_statfilter = full_path_to_long_filter

rq = remote_queue_name

device_name:

backend = full_path_name_to_backend_program

/etc/qconfig is composed of text blocks referred to as stanzas. Each queue is represented

by a pair of stanzas. The first stanza in a pair is referred to as the queue stanza; the second

stanza in a pair is referred to as the device stanza. Stanzas are composed of parameters

and parameter values that describe the queue’s properties and function.

When the qdaemon parses the ASCII version of /etc/qconfig, the first non–commented line

it identifies must be a word followed by a colon; this line represents the beginning of the

queue stanza. This word is the name of a queue to which a user can submit jobs. There

must be one or more lines indented by tabs following this line. One of these lines must be

device = device_name. The value of the device parameter is a link from the queue stanza

to the device stanza; this parameter has no other function. When a queue is initially setup,

the operating system will frequently use the name of a printer, such as lp1, as the value of

the device parameter. While the queue may actually be setup to use lp1, the use of lp1

as the value of the device parameter only means that the device stanza will be named lp1.

This is not related to the fact that there is a real printer known to the operating system as

lp1.

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Compuprint 914 Specifications Page 112

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