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# Regression test: restore the signal mask after fork()
cd "$TEST"
mkfifo p1 p2
{
# Get the PID of `sh`
read -r pid <p1
# Send SIGTERM -- this will hang forever if signals are blocked
kill $pid
} &
# Write the `sh` PID to p1, then hang reading p2 until we're killed
! invoke_bfs p1 -exec bash -c 'echo $$ >p1 && read -r _ <p2' bash {} + || fail
wait
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