Function erlang_nif_sys::erlang_nif_sys_api::enif_term_to_binary

pub unsafe extern "C" fn enif_term_to_binary(
    env: *mut ErlNifEnv, 
    term: ERL_NIF_TERM, 
    bin: *mut ErlNifBinary
) -> c_int

See enif_term_to_binary in the Erlang docs.