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Attaching:
- Find an fd corresponding to the tty in the child
- Open the new pty in the child
- Copy the termios settings over
- dup() it over the old ones
- Make the new tty the controlling tty:
- Fork a dummy child
- Find all processes in the child's process group.
- For each one, move them to the dummy child's process group
- Make the child setsid()
- Set the terminal as the controlling tty
- Close the newly allocated tty
- Detach
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