Function ptrace_attach_from_state 

pub fn ptrace_attach_from_state(
    tracee_task: &Arc<Task>,
    ptrace_state: PtraceCoreState,
) -> Result<(), Errno>

Uses the given core ptrace state (including tracer, attach type, etc) to attach to another task, given by tracee_task. Also sends a signal to stop tracee_task. Typical for when inheriting ptrace state from another task.