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<head><title>openListener(String) -- open a port for listening</title>
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<div><h1>openListener(String) -- open a port for listening</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>f = openListener s</tt></div>
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<li><span>Function: <a href="_open__Listener_lp__String_rp.html" title="open a port for listening">openListener</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>s</tt>, <span>a <a href="___String.html">string</a></span>, of the form <tt>"$interface:port"</tt>. Both parts are optional. If the port is omitted, the colon is optional.</span></li>
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<li><div class="single">Outputs:<ul><li><span><tt>f</tt>, <span>a <a href="___File.html">file</a></span>, an open listener on the specified interface of the local host at the specified service port. If the port is omitted, it is taken to be port 2500. If the interface is omitted, the listener accepts connections on all interfaces.</span></li>
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<div class="single"><h2>Description</h2>
<div><p>Use <tt>openInOut f</tt> to accept an incoming connection on the listener, returning a new input output file that serves as the connection. The function <a href="_is__Ready_lp__File_rp.html" title="whether a file has data available for reading">isReady</a> can be used to determine whether an incoming connection has arrived, without blocking.</p>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_open__In__Out.html" title="open an input output file">openInOut</a> -- open an input output file</span></li>
<li><span><a href="_is__Ready_lp__File_rp.html" title="whether a file has data available for reading">isReady</a> -- whether a file has data available for reading</span></li>
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