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clean_scratch
mkfifo scratch/{pid,hup}
(
# Create a zombie process
echo >/dev/null &
# Write the PID to scratch/pid
echo $! >scratch/pid
# Don't wait on the processes
exec cat scratch/hup >/dev/null
) &
# Kill cat on exit
trap "echo >scratch/hup" EXIT
# Read the zombie PID
read -r pid <scratch/pid
# On Linux, open(/proc/$pid/net) will succeed but readdir() will fail
skip_unless test -r "/proc/$pid/net"
fail invoke_bfs "/proc/$pid/net" >/dev/null
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