dition completion_condition);
</pre>
<p>
          This function is used to read a certain number of bytes of data from a
          random access device at the specified offset. The call will block until
          one of the following conditions is true:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
              The completion_condition function object returns 0.
            </li></ul></div>
<p>
          This operation is implemented 