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<H2><A NAME="SECTION0021230000000000000000">
12.3 UDP Stream Objects</A>
</H2>

<P>
Note that, unlike the name suggests, there is nothing stream-like
about UDP.

<P>
<dl><dt><b><a name="l2h-192"><tt class=member>asr</tt></a></b>
<dd>
<a name="l2h-196"></a>
<a name="l2h-197"></a>
The asynchronous service routine to be called on events such as
datagram arrival without outstanding <tt>Read</tt> call. The <var>asr</var>
has a single argument, the event code.
</dl>

<P>
<dl><dt><b><a name="l2h-193"><tt class=member>port</tt></a></b>
<dd>
A read-only member giving the port number of this UDP Stream.
</dl>

<P>
<dl><dt><b><a name="l2h-194"><tt class=method>Read</tt></a></b> (<var>timeout</var>)
<dd>
Read a datagram, waiting at most <var>timeout</var> seconds (-1 is
infinite).  Return the data.
</dl>

<P>
<dl><dt><b><a name="l2h-195"><tt class=method>Write</tt></a></b> (<var>host, port, buf</var>)
<dd>
Send <var>buf</var> as a datagram to IP-address <var>host</var>, port
<var>port</var>.
</dl><p>
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