unregister_netdevice_notifier(9) [centos man page]
UNREGISTER_NETDEVICE(9) Network device support UNREGISTER_NETDEVICE(9)NAME
unregister_netdevice_notifier - unregister a network notifier block
SYNOPSIS
int unregister_netdevice_notifier(struct notifier_block * nb);
ARGUMENTS
nb
notifier
DESCRIPTION
Unregister a notifier previously registered by register_netdevice_notifier. The notifier is unlinked into the kernel structures and may
then be reused. A negative errno code is returned on a failure.
After unregistering unregister and down device events are synthesized for all devices on the device list to the removed notifier to remove
the need for special case cleanup code.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 UNREGISTER_NETDEVICE(9)
Check Out this Related Man Page
notifier(7) Apple Inc. 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 deliv-
ers 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 2007-2009 by Apple Inc.
12 May 2009 CUPS notifier(7)