NAME

       Nagios::Plugin::Functions - functions to simplify the creation of Nagios plugins

SYNOPSIS

           # Constants OK, WARNING, CRITICAL, and UNKNOWN exported by default
           use Nagios::Plugin::Functions;

           # nagios_exit( CODE, $message ) - exit with error code CODE,
           # and message "PLUGIN CODE - $message"
           nagios_exit( CRITICAL, $critical_error ) if $critical_error;
           nagios_exit( WARNING, $warning_error )   if $warning_error;
           nagios_exit( OK, $result );

           # nagios_die( $message, [$CODE] ) - just like nagios_exit(),
           # but CODE is optional, defaulting to UNKNOWN
           do_something()
             or nagios_die("do_something() failed horribly");
           do_something_critical()
             or nagios_die("do_something_critical() failed", CRITICAL);

           # check_messages - check a set of message arrays, returning a
           # CODE and/or a result message
           $code = check_messages(critical => \@crit, warning => \@warn);
           ($code, $message) = check_messages(
             critical => \@crit, warning => \@warn,
             ok => \@ok );

           # get_shortname - return the default short name for this plugin
           #   (as used by nagios_exit/die; not exported by default)
           $shortname = get_shortname();

DESCRIPTION

       This module is part of the Nagios::Plugin family, a set of modules for simplifying the
       creation of Nagios plugins. This module exports convenience functions for the class
       methods provided by Nagios::Plugin. It is intended for those who prefer a simpler
       functional interface, and who do not need the additional functionality of Nagios::Plugin.

   EXPORTS
       Nagios status code constants are exported by default:

           OK
           WARNING
           CRITICAL
           UNKNOWN
           DEPENDENT

       as are the following functions:

           nagios_exit
           nagios_die
           check_messages

       The following variables and functions are exported only on request:

           %ERRORS
           %STATUS_TEXT
           get_shortname
           max_state
           max_state_alt

   FUNCTIONS
       The following functions are supported:

       nagios_exit( <CODE>, $message )
           Exit with return code CODE, and a standard nagios message of the form "PLUGIN CODE -
           $message".

       nagios_die( $message, [CODE] )
           Same as nagios_exit(), except that CODE is optional, defaulting to UNKNOWN.  NOTE:
           exceptions are not raised by default to calling code.  Set $_use_die flag if this
           functionality is required (see test code).

       check_messages( critical => \@crit, warning => \@warn )
           Convenience function to check a set of message arrays and return an appropriate nagios
           return code and/or a result message. Returns only a return code in scalar context;
           returns a return code and an error message in list context i.e.

               # Scalar context
               $code = check_messages(critical => \@crit, warning => \@warn);
               # List context
               ($code, $msg) = check_messages(critical => \@crit, warning => \@warn);

           check_messages() accepts the following named arguments:

           critical => ARRAYREF
               An arrayref of critical error messages - check_messages() returns CRITICAL if this
               arrayref is non-empty. Mandatory.

           warning => ARRAYREF
               An arrayref of warning error messages - check_messages() returns WARNING if this
               arrayref is non-empty ('critical' is checked first). Mandatory.

           ok => ARRAYREF | SCALAR
               An arrayref of informational messages (or a single scalar message), used in list
               context if both the 'critical' and 'warning' arrayrefs are empty. Optional.

           join => SCALAR
               A string used to join the relevant array to generate the message string returned
               in list context i.e. if the 'critical' array @crit is non-empty, check_messages
               would return:

                   join( $join, @crit )

               as the result message. Optional; default: ' ' (space).

           join_all => SCALAR
               By default, only one set of messages are joined and returned in the result message
               i.e. if the result is CRITICAL, only the 'critical' messages are included in the
               result; if WARNING, only the 'warning' messages are included; if OK, the 'ok'
               messages are included (if supplied) i.e. the default is to return an 'errors-only'
               type message.

               If join_all is supplied, however, it will be used as a string to join the
               resultant critical, warning, and ok messages together i.e.  all messages are
               joined and returned.

       get_shortname
           Return the default shortname used for this plugin i.e. the first token reported by
           nagios_exit/nagios_die. The default is basically

               uc basename( $ENV{NAGIOS_PLUGIN} || $0 )

           with any leading 'CHECK_' and trailing file suffixes removed.

           get_shortname is not exported by default, so must be explicitly imported.

       max_state(@a)
           Returns the worst state in the array. Order is: CRITICAL, WARNING, OK, UNKNOWN,
           DEPENDENT

           The typical usage of max_state is to initialise the state as UNKNOWN and use it on the
           result of various test. If no test were performed successfully the state will still be
           UNKNOWN.

       max_state_alt(@a)
           Returns the worst state in the array. Order is: CRITICAL, WARNING, UNKNOWN, DEPENDENT,
           OK

           This is a true definition of a max state (OK last) and should be used if the internal
           tests performed can return UNKNOWN.

SEE ALSO

       Nagios::Plugin; the nagios plugin developer guidelines at
       http://nagiosplug.sourceforge.net/developer-guidelines.html.

AUTHORS

       This code is maintained by the Nagios Plugin Development Team:
       http://nagiosplug.sourceforge.net

COPYRIGHT AND LICENSE

       Copyright (C) 2006 by Nagios Plugin Development Team

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.