cupsd-helper(8) [mojave man page]
cupsd-helper(8) Apple Inc. cupsd-helper(8) NAME
cupsd-helper - cupsd helper programs SYNOPSIS
cups-deviced request-id limit user-id options cups-driverd cat ppd-name cups-driverd list request_id limit options cups-exec sandbox-profile [ -g group-id ] [ -n nice-value ] [ -u user-id ] /path/to/program argv0 ... argvN DESCRIPTION
The cupsd-helper programs perform long-running operations on behalf of the scheduler, cupsd(8). The cups-deviced helper program runs each CUPS backend(7) with no arguments in order to discover the available printers. The cups-driverd helper program lists all available printer drivers, a subset of "matching" printer drivers, or a copy of a specific driver PPD file. The cups-exec helper program runs backends, filters, and other programs. On macOS these programs are run in a secure sandbox. FILES
The cups-driverd program looks for PPD and driver information files in the following directories: /Library/Printers /opt/share/ppd /System/Library/Printers /usr/local/share/ppd /usr/share/cups/drv /usr/share/cups/model /usr/share/ppd PPD files can be compressed using the gzip(1) program or placed in compressed tar(1) archives to further reduce their size. Driver information files must conform to the format defined in ppdcfile(5). SEE ALSO
backend(7), cups(1), cupsd(8), cupsd.conf(5), filter(7), ppdcfile(5), CUPS Online Help (http://localhost:631/help) COPYRIGHT
Copyright (C) 2007-2017 by Apple Inc. 15 April 2014 CUPS cupsd-helper(8)
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cups-driverd(8) Apple Inc. cups-driverd(8) NAME
cups-driverd - cups driver daemon SYNOPSIS
cups-driverd cat ppd-name cups-driverd list request_id limit options DESCRIPTION
cups-driverd shows or lists PPD files. It is run in response to CUPS-Add-Modify-Printer or CUPS-Get-Devices requests. The first form ("cups-driverd cat ppd-name") writes the named PPD file to stdout. The output format is an uncompressed PPD file. The second form lists the available manufacturers or PPD files to stdout as indicated by the options argument. The output format is an IPP response message. The request_id argument is the request ID from the original IPP request, typically 1. The limit argument is the limit value from the original IPP request - 0 means no limit. Finally, the options argument is a space-delimited list of attributes ("name=value name=value ...") that were passed in with the request. Currently cups-driverd looks for the ppd-make and requested-attributes attributes and tailors the output accordingly. DRIVERS
Drivers can be static PPD files under the /usr/share/cups/model directory or programs under the /usr/lib/cups/driver directory. Static PPD files must conform to the Adobe PPD File Format Specification version 4.3 and may be compressed using the gzip(1) program. Driver programs must implement the command-line interface shown in the next section. DRIVER PROGRAMS Driver programs provide a interface to dynamically-generated PPD files. The following arguments are currently defined: drivername list Lists the supported PPD files to stdout. drivername cat ppdname Writes the named PPD file to stdout. Driver programs MUST NOT query hardware or make other long-term operations that would delay the return of a driver list. See the NOTES sec- tion below for specific recommendations. LISTING FILES (drivername list) When run with the single argument "list", the program must list the available PPD files it can generate to stdout using the following for- mat: "drivername:ppdname" language "make" "make and model" "drivername:ppdname" language "make" "make and model" "1284 device id" "drivername:ppdname" language "make" "make and model" "1284 device id" "(PPD product)" "drivername:ppdname" language "make" "make and model" "1284 device id" "(PPD product)" "PostScript version" "drivername:ppdname" language "make" "make and model" "1284 device id" "(PPD product)" "PostScript version" "type" Drivername is the name of the driver program. Ppdname is the name used to select the given driver. Language is the locale associated with the default language of the PPD file, typically "en". Make is the Manufacturer name from the PPD file. Make and model is the NickName name from the PPD file. 1284 device id is the 1284DeviceId from the PPD file, if any. (PPD product) is the Product string as it would appear in the PPD file or from a PostScript query. PostScript version is the PSVersion string as it would appear in the PPD file or from a PostScript query. Type is "postscript" for PostScript printers, "pdf" for PDF printers, "raster" for raster printers, or "fax" for facsimile devices. WRITING FILES (drivername cat ppdname) When the driver program is run with the "cat ppdname" arguments, it must write the named PPD file to stdout, uncompressed. If the named PPD file does not exist, the driver program must not write any output to stdout and report the error to stderr instead. DRIVER ERROR MESSAGES Error messages can be relayed back to cupsd by writing them to stderr. The following prefixes are recognized: DEBUG: [drivername] Debugging messages ERROR: [drivername] Error messages INFO: [drivername] Informational messages NOTES
Due to performance considerations, driver programs have been officially deprecated and should not be used for new development. Currently only the CUPS web interface and lpinfo(8) command will request lists from all driver programs. SEE ALSO
cupsd(8), cupsd.conf(5), cupstestppd(1), lpinfo(8), http://localhost:631/help COPYRIGHT
Copyright 2007-2011 by Apple Inc. 6 January 2011 CUPS cups-driverd(8)