How to create a pseudo-tty for reading output and writing to input

Question

I am using fork() and execvp() to spawn a process that must believe it is connected to an interactive terminal for it to function properly.

Once spawned, I want to

Answer 1

There's a package called "expect" which you should use. It uses a scripting language called tcl (pronounced tickle).

https://core.tcl-lang.org/expect/