update interface_bytes and get_bandwidth to support macOS as well
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@ -37,23 +37,38 @@ interface_get() {
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echo "$name"
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}
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# interface_bytes give interface name and signal tx/rx return Bytes
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# interface_bytes give an interface name and return both tx/rx Bytes, separated by whitespace (upload first)
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interface_bytes() {
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cat "/sys/class/net/$1/statistics/$2_bytes"
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case "$(uname -s)" in
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Linux)
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upload=$(cat "/sys/class/net/$1/statistics/tx_bytes")
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download=$(cat "/sys/class/net/$1/statistics/rx_bytes")
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echo "$upload $download"
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;;
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Darwin)
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# column 7 is Ibytes (in bytes, rx, download) and column 10 is Obytes (out bytes, tx, upload)
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netstat -nbI "$1" | tail -n1 | awk '{print $10 " " $7}'
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;;
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esac
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}
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# get_bandwidth return the number of bytes exchanged for tx and rx
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get_bandwidth() {
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upload="$(interface_bytes "$1" "tx")"
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download="$(interface_bytes "$1" "rx")"
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local upload=0
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local download=0
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#wait the interval for Wait for interval to calculate the difference
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IFS=' ' read -r upload download <<< "$(interface_bytes "$1")"
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# wait for interval to calculate the difference
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sleep "$INTERVAL"
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upload="$(bc <<<"$(interface_bytes "$1" "tx") - $upload")"
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download="$(bc <<<"$(interface_bytes "$1" "rx") - $download")"
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IFS=' ' read -r new_upload new_download <<< "$(interface_bytes "$1")"
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#set to 0 by default useful for non-existent interface
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upload=$(( $new_upload - $upload ))
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download=$(( $new_download - $download ))
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# set to 0 by default
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echo "${upload:-0} ${download:-0}"
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}
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