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<dt class='head--doc'>Note</dt> <dd class='body--doc'><p>Most methods can't be called for a file descriptor that isn't open. Notable exceptions <code>errno</code>, <code>mode</code>, and the set and query functions for callbacks and backend.</p> </dd></dl> <hr /> <dl class='group--doc'> <dt class='head--type'><span class='homogen--type'>Method</span>
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<span class='homogen--name'><b>isatty</b></span>
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</dt>
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<dd><p><code><code class='datatype'>bool</code> <b><span class='method'>isatty</span>(</b><b>)</b></code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>Returns true if the file is a terminal.</p>
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</dd></dl>
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<hr />
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<dl class='group--doc'>
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<dt class='head--type'><span class='homogen--type'>Method</span>
<span class='homogen--name'><b>linger</b></span> </dt> <dd><p><code><code class='datatype'>bool</code> <b><span class='method'>linger</span>(</b><code class='datatype'>int(-1..65535)</code>|<code class='datatype'>void</code> <code class='argument'>seconds</code><b>)</b></code></p></dd> <dt class='head--doc'>Description</dt> <dd class='body--doc'><p>Set the socket linger behaviour on <code>close()</code>.</p> </dd> <dt class='head--doc'><span id='p-seconds'></span>Parameter <code class='parameter'>seconds</code></dt> <dd></dd><dd class='body--doc'><table class='box'><tr><td><code><code class='key'>-1</code></code></td><td><p>Reset to default behaviour. This typically means that <code>close()</code> will return immediately, but any buffered