How to read command output when in Control mode (-CC)

[Tomiyou]

I am spawning a new Tmux subprocess in Control mode from a Rust program like this:

tmux -CC attach-session -t test_session

I need to use two -CC flags, since if I only use a single -C flag, tmux will immediately detach when STDIN is piped to the original Rust program.

However, I don't know how to get output of commands such as list-windows as tmux will not print anything to the STDOUT when using -CC. Is there a socket I am supposed to attach to and read output from there? Or am I misunderstanding this whole approach?

[nicm]

-CC probably only makes sense if you're going to run it in a pty, if you just want to use stdin and stdout as pipes then you're better off with -C, although you will need both stdin and stdout.

[Tomiyou]

Makes sense, I will use -C instead.