Setting up pipelines reading from named pipes without blocking in bash

$ mkfifo /tmp/foobar.pipe
$ some_program --command-fd=5 5</tmp/foobar.pipe

$ mkfifo /tmp/foobar.pipe
$ some_program --command-fd=5 5<>/tmp/foobar.pipe

mkfifo /tmp/foobar.in
mkfifo /tmp/foobar.out
( cat </tmp/foobar.in ) >/tmp/foobar.out &
some_program --command-fd=5 5</tmp/foobar.out