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<dd><p><code><code class='datatype'>constant</code> <code class='datatype'>int</code> <code class='constant'>is_val_null</code></code></p></dd> <dt class='head--doc'>Description</dt> <dd class='body--doc'><p>Nonzero recognition constant.</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>iterator_index</b></span>
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</dt>
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<dd><p><code><code class='datatype'>mixed</code> <b><span class='method'>iterator_index</span>(</b><code class='datatype'>object</code> <code class='argument'>iter</code><b>)</b></code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>Get the current index for <code>iter</code>.</p>
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</dd>
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<dt class='head--doc'>See also</dt>
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<dd class='body--doc'><p><code>get_iterator()</code></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>
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<span class='homogen--name'><b>iterator_next</b></span>
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</dt>
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<dd><p><code><code class='datatype'>bool</code> <b><span class='method'>iterator_next</span>(</b><code class='datatype'>object</code> <code class='argument'>iter</code><b>)</b></code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>Advance <code>iter</code> one step.</p>
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</dd>
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<dt class='head--doc'>See also</dt>
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<dd class='body--doc'><p><code>get_iterator()</code></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>
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<span class='homogen--name'><b>iterator_value</b></span>
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</dt>
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<dd><p><code><code class='datatype'>mixed</code> <b><span class='method'>iterator_value</span>(</b><code class='datatype'>object</code> <code class='argument'>iter</code><b>)</b></code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>Get the current value for <code>iter</code>.</p>
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</dd>
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<dt class='head--doc'>See also</dt>
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<dd class='body--doc'><p><code>get_iterator()</code></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>kill</b></span> </dt> <dd><p><code><code class='datatype'>bool</code> <b><span class='method'>kill</span>(</b><code class='datatype'>int</code> <code class='argument'>pid</code>, <code class='datatype'>int</code> <code class='argument'>signal</code><b>)</b></code></p></dd> <dt class='head--doc'>Description</dt> <dd class='body--doc'><p>Send a signal to another process.</p> <p> Some signals and their supposed purpose:</p> <table class='box'><tr><td><code><code class='key'>SIGHUP</code></code></td><td><p>Hang-up, sent to process when user logs out.</p> </td></tr> <tr><td><code><code class='key'>SIGINT</code></code></td><td><p>Interrupt, normally sent by ctrl-c.</p>