title: "shm_open" Gives "Variadic function is unavailable" in swift
body: <p>Is <code>shm_open</code> supported in swift?</p>
  <p>I can use <code>shm_unlink</code> but <code>shm_open</code> doesn't exist.</p>
  <pre><code>shm_open(&quot;/myregion&quot;, O_CREAT | O_RDWR)
  </code></pre>
  <p>If <code>shm_open</code> not supported in Swift is there an equivalent way to  create a shared memory file descriptor for mapping?</p>
  <p>I have managed to create shared memory in C but still not in Swift.</p>