#!/usr/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

open_inodes - Plugin to monitor the number of open files in the system

=head1 CONFIGURATION

No configuration

=head1 AUTHOR

Unknown author

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. "$MUNIN_LIBDIR/plugins/plugin.sh"

if [ "$1" = "autoconf" ]; then
	if [ -r /proc/sys/fs/inode-nr ]; then
		echo yes
		exit 0
	else
		echo no
		exit 0
	fi
fi

if [ "$1" = "config" ]; then

	echo 'graph_title Inode table usage'
	echo 'graph_args --base 1000 -l 0'
	echo 'graph_vlabel number of open inodes'
	echo 'graph_category system'
	echo 'graph_info This graph monitors the Linux open inode table.'
	echo 'used.label open inodes'
	echo 'used.info The number of currently open inodes.'
	print_warning used
	print_critical used
	echo 'max.label inode table size'
	echo 'max.info The size of the system inode table. This is dynamically adjusted by the kernel.'
	print_warning max
	print_critical max
	exit 0
fi

awk '{print "used.value " $1-$2 "\nmax.value " $1}' < /proc/sys/fs/inode-nr