s="nv">set</span> <span class="nv">errno</span> <span class="nv">to</span> <span class="nv">indicate</span> <span class="nv">the</span> <span class="nv">error</span>. <span class="k">If</span>
<span class="o">-</span><span class="mi">1</span> <span class="nv">is</span> <span class="nv">returned</span>, <span class="nv">the</span> <span class="nv">named</span> <span class="nv">file</span> <span class="nv">shall</span> <span class="nv">not</span> <span class="nv">be</span> <span class="nv">changed</span>.
</c