cvd_or_error</td><td>The completion handler; it is passed either the success code (all requested bytes were read), or an error code (pipe is hosed). </td></tr>
    <tr><td class="paramname">target_payload_blob</td><td><code><a class="el" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96" title="Short-hand for an mutable blob somewhere in memory, stored as exactly a void* and a size_t.">util::Blob_mutable</a></code> object describing the memory area into which we shall write on successful rec