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#!/usr/bin/env bash
rv=0
# Minimalist version of cleanup, used for signal handling.
# Sends a SIGKILL to the entire process group, including ourselves.
# Needs just two external commands, making it more
# robust in case of resource issues.
panic() {
echo "$0(pid $$): Caught a signal, emergency clean-up"
# use "pgid:1=" output format to get unpadded process group ID
group_id=`ps -p $$ -o pgid:1=`
echo "$0(pid $$): sending kill to process group ID:${group_id}"
kill -9 -- -${group_id}
# not reached
}
# Happy camper leisurely clean up - send the signal only to other
# processes in the process group, and also check
# that the processes exists before sending the signal.
atexit() {
group_id=`ps -p $$ -o pgid=`
my_id=$$
ids=`pgrep -g $group_id -d ' ' | gsed "s/\b$my_id\b//g"`
echo "Killing possible remaining process IDs: $ids"
for id in $ids
do
if ps -p $id > /dev/null
then
kill -9 $id
fi
done
exit ${rv}
}
trap "panic;" SIGINT SIGTERM
FORCE_FOREGROUND=$1
shift
source $1
shift
if [[ "${FORCE_FOREGROUND}" == "1" ]]
then
$*
else
$* &
pid=$!
wait ${pid}
fi
rv=$?
atexit
exit ${rv}
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