A wrapper to allow sudo chrt for synergys

chrt-synergy

#!/bin/bash
#
# Give sudo right to run chrt for giving RT prio for synergys
# (relatively) safely to avoid delay of cursor or
# keyboard input in remote end.
#
# So far scheduler (SCHED_RR) and prio (50) is hard-coded.

synergys_exepath="/usr/bin/synergys"

targetpid="$1"

DIE () {
    echo "ERROR: $*" >&2
    exit 1
}


# Check if argument is numeric
if [ -z "$targetpid" -o -n "${targetpid//[0-9]/}" ]
then
    DIE "Invalid PID number: $targetpid"
fi

if [ ! -d /proc/$targetpid ]
then
    DIE "No process with PID=$targetpid running"
elif [ ! -r /proc/$targetpid/exe ]
then
    DIE "You are not the owner of process PID=$targetpid"
elif [ "$(readlink /proc/$targetpid/exe)" != "$synergys_exepath" ]
then
    DIE "The PID you gave ($targetpid) is not for synergys"
fi


echo sudo /usr/bin/chrt --rr -p 50 $targetpid

USERNAME ALL=NOPASSWD:/usr/local/bin/chrt-synergys