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-.\" Copyright (c) 1983, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)5.t	8.1 (Berkeley) 6/8/93
-.\"
-.NH 1
-Output filter specifications
-.PP
-The filters supplied with 4.3BSD
-handle printing and accounting for most common
-line printers, the Benson-Varian, the wide (36") and
-narrow (11") Versatec printer/plotters. For other devices or accounting
-methods, it may be necessary to create a new filter.
-.PP
-Filters are spawned by \fIlpd\fP
-with their standard input the data to be printed, and standard output
-the printer.  The standard error is attached to the
-.B lf
-file for logging errors or \fIsyslogd\fP may be used for logging errors.
-A filter must return a 0 exit
-code if there were no errors, 1 if the job should be reprinted,
-and 2 if the job should be thrown away.
-When \fIlprm\fP
-sends a kill signal to the \fIlpd\fP process controlling
-printing, it sends a SIGINT signal 
-to all filters and descendents of filters.
-This signal can be trapped by filters that need
-to do cleanup operations such as
-deleting temporary files.
-.PP
-Arguments passed to a filter depend on its type.
-The
-.B of
-filter is called with the following arguments.
-.DS
-\fIfilter\fP \fB\-w\fPwidth \fB\-l\fPlength
-.DE
-The \fIwidth\fP and \fIlength\fP values come from the
-.B pw
-and
-.B pl
-entries in the printcap database.
-The
-.B if
-filter is passed the following parameters.
-.DS
-\fIfilter\fP [\|\fB\-c\fP\|] \fB\-w\fPwidth \fB\-l\fPlength \fB\-i\fPindent \fB\-n\fP login \fB\-h\fP host accounting_file
-.DE
-The
-.B \-c
-flag is optional, and only supplied when control characters
-are to be passed uninterpreted to the printer (when using the
-.B \-l
-option of
-.I lpr
-to print the file).
-The
-.B \-w
-and
-.B \-l
-parameters are the same as for the
-.B of
-filter.
-The
-.B \-n
-and
-.B \-h
-parameters specify the login name and host name of the job owner.
-The last argument is the name of the accounting file from
-.IR printcap .
-.PP
-All other filters are called with the following arguments:
-.DS
-\fIfilter\fP \fB\-x\fPwidth \fB\-y\fPlength \fB\-n\fP login \fB\-h\fP host accounting_file
-.DE
-The
-.B \-x
-and
-.B \-y
-options specify the horizontal and vertical page
-size in pixels (from the
-.B px
-and
-.B py
-entries in the printcap file).
-The rest of the arguments are the same as for the
-.B if
-filter.