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<span id="select_005fsockets"></span><div class="header">
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<span id="Call-Unix-select-for-data-connections"></span><h3 class="section">3.15 Call Unix <code>select</code> for data connections</h3>
<span id="index-select-sockets"></span>
<span id="XREFselect_005fsockets"></span><dl>
<dt id="index-select_005fsockets">Loadable Function: <em></em> <strong>select_sockets</strong> <em>(<var>connections</var>, <var>timeout</var>)</em></dt>
<dt id="index-select_005fsockets-1">Loadable Function: <em></em> <strong>select_sockets</strong> <em>(<var>connections</var>, <var>timeout</var>, <var>nfds</var>)</em></dt>
<dd><p>Calls Unix <code>select</code> for data connections in a parallel cluster.
</p>
<p>This function is for advanced usage (and therefore has minimal
documentation), typically the programming of schedulers. It can be
called at the client or at a server.
</p>
<p><var>connections</var>: valid connections object (see <code>pconnect</code> and
<code>pserver</code>, possibly indexed).
</p>
<p><var>timeout</var>: seconds, negative for infinite.
</p>
<p><var>nfds</var>: Passed to Unix <code>select</code> as first argument, see
documentation of Uix <code>select</code>. Default: <code>FD_SETSIZE</code>
(platform specific).
</p>
<p>An error is returned if nfds or a watched filedescriptor plus one
exceeds FD_SETSIZE.
</p>
<p>Returns an index vector to <var>connections</var> indicating connections
with pending input, readable with <code>precv</code>.
</p>
<p>If called at the client, the command connections are included into the
UNIX <code>select</code> call and checked for error flags, and
<code>select_sockets</code> returns an error if a flag for a remote error is
received.
</p>
<p><strong>See also:</strong> <a href="pconnect.html#XREFpconnect">pconnect</a>, <a href="pserver.html#XREFpserver">pserver</a>, <a href="reval.html#XREFreval">reval</a>, <a href="psend.html#XREFpsend">psend</a>, <a href="precv.html#XREFprecv">precv</a>, <a href="sclose.html#XREFsclose">sclose</a>, <a href="Authentication.html#XREFparallel_005fgenerate_005fsrp_005fdata">parallel_generate_srp_data</a>.
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