redirect both stdin and stdout

Question

I would like to delegate netcat stdin and stdout to a function.

I can do the following to redirect stdout only

nc -l -p 1234 | my_function

I can do the following to redirect stdin only

nc -l -p 1234 < <(my_function)

should be easy to do the wiring with python/perl/ruby, but I guess it's also doable with bash... named pipes perhaps? — Karoly Horvath, Jun 12 '14 at 18:00
possible duplicate of [how to redirect stdout of 2nd process back to stdin of 1st process?](http://stackoverflow.com/questions/5129276/how-to-redirect-stdout-of-2nd-process-back-to-stdin-of-1st-process) — Karoly Horvath, Jun 12 '14 at 18:10

score 4 · Accepted Answer · answered Jun 12 '14 at 18:14

When my_function is wrapped as an executable form (file), you can use -e option of netcat:

nc -l -p 1234 -e my_function

However if it's a function in bash, starting Bash 4.0 you can use coproc:

coproc my_function
nc -l -p 1234 <&"${COPROC[0]}" >&"${COPROC[1]}"

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