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

: << =cut

=head1 NAME

open_files - 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/file-nr ]; then
		echo yes
		exit 0
	else
		echo no
		exit 0
	fi
fi

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

	echo 'graph_title File table usage'
	echo 'graph_args --base 1000 -l 0'
	echo 'graph_vlabel number of open files'
	echo 'graph_category system'
	echo 'graph_info This graph monitors the Linux open files table.'
	echo 'used.label open files'
	echo 'used.info The number of currently open files.'
	computed_warning=$(awk '{printf "%d", $3*0.92}' < /proc/sys/fs/file-nr)
	computed_critical=$(awk '{printf "%d", $3*0.98}' < /proc/sys/fs/file-nr)
	p_warning=$(print_warning used)
	p_critical=$(print_critical used)
	[ -z "$p_warning" ] && echo "used.warning $computed_warning" || echo "$p_warning"
	[ -z "$p_critical" ] && echo "used.critical $computed_critical" || echo "$p_critical"
	exit 0
fi

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