#!/bin/bash

trap 'rm -f fifo' EXIT

mkfifo fifo || exit

# A writer opens, writes and closes after the reader has observed EOF but
# before the reader closes its end.

: > fifo &
exec 3< fifo
read <&3 || echo EOF

echo two > fifo && echo "wrote two" 

exec 3<&- # data loss
echo three > fifo &
cat fifo