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GNU/Linux |
CentOS 5.1 |
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filter(7) |
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filter − cups file conversion filter interface
filter job user title num-copies options [ filename ]
The CUPS filter interface provides a standard method for adding support for new document types to CUPS. Each filter is capable of converting from one or more input formats to another format that can either be printed directly or piped into another filter to get it to a printable format.
Filters must be capable of reading from a filename on the command-line or from the standard input, copying the standard input to a temporary file as required by the file format. All output must be sent to the standard output.
The command name (argv[0]) is set to the name of the destination printer.
Messages sent
to stderr are generally logged to printer-state-message
attribute and the current ErrorLog. Each line begins
with a standard prefix:
ALERT: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "alert" log level.
ATTR: attribute=value [attribute=value]
Sets the named job attribute(s). Typically this will be used to set the job-remote-id attribute.
CRIT: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "critical" log level.
DEBUG: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "debug" log level.
DEBUG2: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "debug2" log level.
EMERG: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "emergency" log level.
ERROR: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "error" log level.
INFO: message
Sets the printer-state-message attribute. If the current LogLevel is set to "debug2", also adds the specified message to the current ErrorLog using the "info" log level.
NOTICE: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "notice" log level.
PAGE: page-number #-copies
PAGE: #-pages total
Adds an entry to the current PageLog. The first form adds #-copies to the job-media-sheets-completed attribute. The second form sets the job-media-sheets-completed attribute to #-pages.
STATE: printer-state-reason
[printer-state-reason ...]
STATE: + printer-state-reason [printer-state-reason ...]
STATE: - printer-state-reason [printer-state-reason ...]
Sets, adds, or removes printer-state-reason keywords to the current queue. Typically this is used to indicate media, ink, and toner conditions on a printer.
WARNING: message
Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "warning" log level.
The following
environment variables are defined by the CUPS server when
executing the filter:
CHARSET
The default text character set, typically utf-8.
CLASS
When a job is submitted to a printer class, contains the name of the destination printer class. Otherwise this environment variable will not be set.
CONTENT_TYPE
The MIME type associated with the file (e.g. application/postscript).
CUPS_DATADIR
The directory where data files can be found.
CUPS_SERVERROOT
The root directory of the server.
DEVICE_URI
The device-uri associated with the printer.
FINAL_CONTENT_TYPE
The MIME type associated with the printer (e.g. application/vnd.cups-postscript).
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LANG |
The default language locale (typically C or en). | ||
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PATH |
The standard execution path for external programs that may be run by the filter. | ||
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PPD |
The full pathname of the PostScript Printer Description (PPD) file for this printer. |
PRINTER
The name of the printer.
RIP_CACHE
The recommended amount of memory to use for Raster Image Processors (RIPs).
SOFTWARE
The name and version number of the server (typically CUPS/1.2).
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TZ |
The timezone of the server. | ||
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USER |
The user executing the filter, typically "lp" or "root"; consult the cupsd.conf(5) file for the current setting. |
While the filter interface is compatible with System V interface scripts, it will only work with the System V interface script as the only filter. Typically the interface script will be provided via the lpadmin(8) command using the -i option.
backend(1),
cupsd(8),
http://localhost:631/help
Copyright 1997-2006 by Easy Software Products, All Rights Reserved.
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filter(7) | |