Check in my NOTES file.

nelhage · Jan 18, 2011 · 8afd56e · 8afd56e
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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