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# $FreeBSD$
v=$(
${SH} -c 'trap "echo ok; exit" USR1; kill -USR1 $$' &
# Suppress possible message about exit on signal
wait $! >/dev/null 2>&1
)
r=$(kill -l $?)
[ "$v" = "ok" ] && { [ "$r" = "USR1" ] || [ "$r" = "usr1" ]; }
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