# notifier(7)

## Name

notifier - cups notification interface

## Synopsis

notifier recipient [ user-data ]

## Description

The CUPS notifier interface provides a standard method for adding support for new event notification methods to CUPS. Each notifier delivers one or more IPP events from the standard input to the specified recipient.

Notifiers must read IPP messages from the standard input using the ippNew and ippReadFile functions and exit on error. Notifiers are encouraged to exit after a suitable period of inactivity, however they may exit after reading the first message or stay running until an error is seen.

## Log Messages

Messages sent to stderr are generally logged to 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.
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.
WARNING: message
  Sets the printer-state-message attribute and adds the specified message to the current ErrorLog using the "warning" log level.

## Environment Variables

The following environment variables are defined by the CUPS server when executing the notifier:

CHARSET
  The default text character set, typically utf-8.
CUPS_CACHEDIR
  The directory for semi-persistent cache files can be found.
CUPS_DATADIR
  The directory where data files can be found.
CUPS_FILETYPE
  The type of file being printed: "job-sheet" for a banner page and "document" for a regular print file.
CUPS_SERVERROOT
  The root directory of the server.
LANG
  The default language locale (typically C or en).
PATH
  The standard execution path for external programs that may be run by the filter.
SOFTWARE
  The name and version number of the server (typically CUPS/1.2).
TZ
  The timezone of the server.
USER
  The user executing the filter, typically "lp"; consult the cupsd.conf(5) file for the current setting.

## See Also

backend(7), cupsd(8), filter(7),
http://localhost:631/help

## Copyright

Copyright 2007-2012 by Apple Inc.