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# Function nemo_relay_register_subscriber

> Register an event subscriber. The callback is invoked for every lifecycle event emitted by the runtime.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-ffi`.

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Register an event subscriber. The callback is invoked for every lifecycle event emitted by the runtime.

## Parameters

* `name`: Unique subscriber name.
* `cb`: Event callback. The `FfiEvent` is valid only during the call.
* `user_data`: Opaque pointer passed to `cb`.
* `free_fn`: Optional destructor for `user_data`.

## Safety

`name` must be a valid C string. `cb` must be a valid function pointer.