; e.g., it may be a constant; or it may be passed in a previous message. However, it's not compatible with using a sentinel alone, as then N is unknown.)<ul>
<li>You must only transmit handles as part of handle-containing messages. Anything else is undefined behavior.</li>
</ul>
</li>
<li>Let M be a given handle-containing message with blob B of size N; and handle H. Let a <em>write op</em> be <a class="el" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1022dfd42e9a0d6eab8384b0352decb0