1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2<html xml:lang="en-US" lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
3  <head>
4    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
5    <meta http-equiv="Content-Style-Type" content="text/css" />
6    <link rel="stylesheet" href="../../css/manpage.css" type="text/css" />
7<title>Poll</title>
8  </head>
9  <body>
10<h1><CODE>nn::socket::Poll</CODE> Function</h1>
11<h2>Syntax</h2>
12    <div class="section">
13      <pre class="definition">
14s32 Poll(
15     <a href="../../nn/socket/PollFd/Overview.html">PollFd</a> fds[],
16     u32 nfds,
17     s32 timeout
18);
19</pre>
20    </div>
21<h2>Arguments</h2>
22    <div class="section">
23      <table class="arguments">
24        <thead>
25          <tr>
26            <td width="15" />
27<th>Name</th>
28<td>Description</td>
29          </tr>
30        </thead>
31        <tr>
32<td>in</td>
33<th>fds[]</th>
34<td>Specifies the socket to poll and the polling conditions as well as the <a href="../../nn/socket/PollFd/Overview.html"><CODE>PollFd</CODE></a> array for getting the polling results.</td>
35        </tr>
36        <tr>
37<td>in</td>
38<th>nfds</th>
39<td>Specifies the number of elements in the array specified in <SPAN class="argument">fds</SPAN>.</td>
40        </tr>
41        <tr>
42<td>in</td>
43<th>timeout</th>
44<td>Specifies the number of milliseconds to wait for a socket to be found before timing out. Specify a value of <CODE>0</CODE> or greater, or one of the following constants.<br /><itemizedlist><listitem><para><CODE>INFTIM</CODE>: Do not time out.<br /></para></listitem></itemizedlist></td>
45        </tr> </table>
46    </div>
47<h2>Return Values</h2>
48<div class="section">Returns a positive number, which is the number of readable and/or writable socket descriptors. </div>
49<h2>Description</h2>
50    <div class="section">
51<p>Checks the specified set of multiple socket descriptors to see if reading or writing is possible for any of them.</p><p>This function monitors changes in the state of sockets. Normally, it blocks until a socket satisfying the specified conditions is found. The function unblocks if it times out without finding a socket that meets the specified conditions, if the <a href="../../nn/socket/Shutdown.html"><CODE>Shutdown</CODE></a> or <a href="../../nn/socket/Close.html"><CODE>Close</CODE></a> function is used to interrupt socket sending and receiving, or if any abnormality is detected in a socket.</p><!-- write here --></div>
52<h2>See Also</h2>
53    <div class="section">
54      <p class="reference">
55            <br /> </p>
56    </div>
57<h2>Revision History</h2>
58    <div class="section">
59      <dl class="history">
60        <dt>2010/06/14</dt>
61<dd>Initial version.<br />
62        </dd>
63      </dl>
64    </div>
65  <hr><p>CONFIDENTIAL</p></body>
66</html>