Method bpf_buffer__poll

plugins/wasm_bpf/wasm-bpf.cpp:64–66

    bpf_map__set_value_size(events, sizeof(int));
  }
  int32_t bpf_buffer__poll(int32_t timeout_ms) override {
    return perf_buffer__poll(inner.get(), timeout_ms);
  }
  int32_t bpf_buffer__open(int32_t fd, bpf_buffer_sample_fn sample_cb,
                           void *ctx) override {
    fn = sample_cb;