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#!/bin/sh
# /proc/net/dev is of format:
# eth0: 3060584 34117 0 0 0 0 0 62 12664336 30804 0 0 0 3 0 0
# BASH SUCKS!!!! $[ ] checks the length of the numbers.
# It can handle the number 978796983 - but can't handle 0978796983!!!
led_netload () {
if test -z "$1" -o -z "$2"; then
echo "bad command-line options" >&2
return 1
fi
IN=""
OUT=""
case "$2" in
in|IN)
IN=`grep "$1:" /proc/net/dev | tr ":" " " | awk '{ print $2 }'`
OUT=""
;;
out|OUT)
IN=""
OUT=`grep "$1:" /proc/net/dev | tr ":" " " | awk '{ print $10 }'`
;;
both|BOTH)
IN=`grep "$1:" /proc/net/dev | tr ":" " " | awk '{ print $2 }'`
OUT=`grep "$1:" /proc/net/dev | tr ":" " " | awk '{ print $10 }'`
;;
*)
echo "bad command-line option $2" >&2
return 1
;;
esac
# Check for interface existance
if test -z "$IN" -a -z "$OUT"; then
return 1
fi
# Make them numbers.
test -z "$IN" && IN=0
test -z "$OUT" && OUT=0
# Has to use bc in order to avoid overflow.
VALUE=`echo "( $IN + $OUT ) / 1024" | bc`
TIME=`date +%s`
# Retrieve the old values.
eval 'OLDVALUE=$LED_NETLOAD_VALUE_'$COUNT
eval 'OLDTIME=$LED_NETLOAD_TIME_'$COUNT
test -z "$OLDVALUE" && OLDVALUE=0
test -z "$OLDTIME" && OLDTIME=0
# Don't check too often - the values may be too inaccurate.
# Even 5 secs gives max. inaccuracy of 20%.
if test $[ $TIME - $OLDTIME ] -lt 5; then
SUCCESS=nop
return 0
fi
# Save the new values.
eval 'LED_NETLOAD_TIME_'$COUNT'=$TIME'
eval 'LED_NETLOAD_VALUE_'$COUNT'=$VALUE'
if test "$OLDVALUE" = "0" -o "$VALUE" -lt "$OLDVALUE" ; then
# This is either the first call, so we have no stats or
# an overflow has occurred in /proc/net/dev, we will just
# ignore it (they occur about once every 4GB).
SUCCESS=nop
return 0
fi
KBPS=`echo " ( 0$VALUE - 0$OLDVALUE ) / ( 0$TIME - 0$OLDTIME )" |bc`
SUCCESS="$SUCCESS $KBPS"
return 0
}
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