busybox/shell/ash_test/ash-signals/signal2.tests

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#!/bin/sh
$THIS_SH -c '
cleanup() {
echo "child exits as expected"
exit
}
trap cleanup HUP
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echo "child sleeps"
sleep 1
echo "BAD exit from child!"
' &
child=$!
sleep 0.1 # let child install handler first
kill -HUP $child
wait
echo "parent exits"