#!/bin/sh
# 
# Plugin to monitor the number of open files in the system.
#
# Parameters:
# 	
# 	config   (required)
# 	autoconf (optional - used by munin-config)
#
# Magic markers (Used by munin-config and some installation scripts.
# Optional):
#
#%# family=auto
#%# capabilities=autoconf



if [ "$1" = "autoconf" ]; then
	if [ -r /proc/sys/fs/file-nr ]; then
		echo yes
		exit 0
	else
		echo no
		exit 1
	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.'
	echo 'max.label max open files'
	echo 'max.info The maximum supported number of open files. Tune by modifying /proc/sys/fs/file-max.'
	awk  '{printf "used.warning %d\nused.critical %d\n",$3*0.92,$3*0.98}' < /proc/sys/fs/file-nr
	exit 0
fi

awk '{print "used.value " $1-$2 "\nmax.value " $3}' < /proc/sys/fs/file-nr
