AIX 5L Problem Determination - IBM Redbooks

Action or function System V PowerPC Infoprint Manager
for AIX
Print processing
filters
Called by interface
script based on
filter setup with
lpfilter and by
actually calling the
filters in the shell
script. Some filters
are called by
lpsched to convert
files to PostScript
automatically.
Output filters The shell script
passes the setup
and commands to
output filters such
as lp.cat and
postio, which can
talk directly with
printers and handle
errors.
LPD/LPR remote
printing
Controlled by
lpsched, which
starts lpNet
daemon.
Formatting filters,
such as pioformat,
are called
automatically
based on the data
type set up for the
printer. Other filters
are called by the
piobe backend
based on virtual
printer attributes
starting with f, and
can be called by
users from the
command line. The
enscript filter can
be called
automatically to
convert text to
PostScript.
The piobe backend
passes data
through pioout,
which writes
directly to the
device. Errors are
handled by
communications
through the
qdaemon.
Remote lpr jobs are
sent by the
qdaemon backend
rembak and
received by the lpd
daemon. The lpd
queues local jobs
by calling enq.
Depends on type of
incoming data and
destination. Data
stream transforms
are called
automatically
based on the type
of input data if the
destination
supports it. AIX
formatting filters if
the destination is
supported by the
PowerPC print
subsystem.
Secondary
processes are
provided to
communicate with
TCP/IP-attached
printers using
sockets,
channel-attached
printers, and
PowerPC print
filters.
In multi-server
environments
remote jobs are
transferred
between servers
using sockets and
RPCs.
Chapter 9. System access and printer problem determination 223