uperf-server-stop

#!/bin/bash
exec >uperf-server-stop-stderrout.txt 
exec 2>&1
echo "args; $@"

kill_child_pid() {
    # uperf server spawns a child process internally. Kill that child pid also. If not
    # and when we have not fully closed connection cleanly i.e pending on FIN-ACK in CRR,
    # the child still LISTEN on port and will cause the next run to fail to connect. 
    # The extra "grep -v" to exlude the grep command's pid.
    #   root        3305       1  0 14:13 ?        00:00:00 uperf -s -P 30016
    #   root        3388    3305 99 14:14 ?        00:00:03 uperf -s -P 30016
    #   root        3454    3387  0 14:14 pts/0    00:00:00 grep uperf

    local pid=$(ps aux | grep -v grep | grep "uperf .* -P $1" | awk '{print $2}' | head -n 1)
    if [ -n "$pid" ]; then
        echo "Killing child process with PID $pid"
        kill -9 $pid
    fi
}

if [ -e uperf-server.pid ]; then
    pid=`cat uperf-server.pid`
    control_port=$(ps -p $pid -o args | grep -o '\-P [^ ]*' | awk '{print $2}')
    echo "Going to kill pid $pid"
    kill -15 $pid
    sleep 3
    if [ -e /proc/$pid ]; then
        echo "PID $pid still exists, trying kill -9"
        kill -9 $pid
    fi
    kill_child_pid "$control_port"
else
    echo "uperf-server.pid not found"
    echo "PWD: `/bin/pwd`"
    echo "LS: `/bin/ls`"
    exit 1
fi