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