Re: [PATCH v3 7/7] block: check availablity for preadv/pwritev on mac

[Stefan Hajnoczi]

On Wed, Oct 28, 2020 at 06:07:16PM -0700, Joelle van Dyne wrote:
> If built with Xcode 12 without the checks, a runtime error will occur.

If that runtime error is ENOSYS then it's handled by existing code:

  if (preadv_present) {
      nbytes = handle_aiocb_rw_vector(aiocb);
      if (nbytes == aiocb->aio_nbytes ||
          (nbytes < 0 && nbytes != -ENOSYS)) {
          goto out;
      }
      preadv_present = false;
  }

Why is additional code needed for iOS?

Stefan

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