 <code>block</code> may be set to <code>false</code> for non-blocking I/O on pipes. This one setting is used with any pipes which are used for I/O. Remember to catch <code>Sys_blocked_io</code> when doing I/O with any non-blocking pipes.</p><p>Both <code>env</code> and <code>block</code> can also be set with combinators.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-pipe_in"><a href="#val-pipe_in" class="anchor"></a><code><span><span class="keyword">val</span> pipe_in : <spa