busybox/shell/ash_test/ash-signals/signal7.tests

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bug() {
trap : exit
# Bug was causing sh to be run in subshell,
# as if this line is replaced with (sh -c ...; exit $?) &
# here:
sh -c 'echo REAL_CHILD=$$' &
echo PARENTS_IDEA_OF_CHILD=$!
wait # make sure bkgd shell completes
}
bug | {
while read varval; do
eval $varval
done
test x"$REAL_CHILD" != x"" \
&& test x"$REAL_CHILD" = x"$PARENTS_IDEA_OF_CHILD"
echo "Bug detected: $?"
}