title: Ctypes and pointers to string arrays
body: <p>I have a C function with the following signature:</p>
  
  <pre class="lang-c prettyprint-override"><code>void init(int* argc, char** argv[]);
  </code></pre>
  
  <p>I want to call this function from my OCaml code using Ctypes, but I can't figure a proper way to pass <code>Sys.argv</code> to it.</p>