<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/85150>85150</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc][posix 2001] implement fileno
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            good first issue,
            libc
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          nickdesaulniers
      </td>
    </tr>
</table>

<pre>
    libc++ depends on posix fileno. We should implement this in libc.

see `man 3 fileno`.

https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/
</pre>
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