Function rustler_sys::rustler_sys_api::enif_get_resource

pub unsafe extern "C" fn enif_get_resource(
    arg1: *mut ErlNifEnv,
    term: ERL_NIF_TERM,
    _type: *const ErlNifResourceType,
    objp: *mut *const c_void
) -> c_int

See enif_get_resource in the Erlang docs.