Imported Upstream version 2.8.14
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Ari Pollak
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<title>GIMP Base Library Reference Manual: gimpsignal</title>
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<a name="libgimpbase-gimpsignal"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<h2><span class="refentrytitle"><a name="libgimpbase-gimpsignal.top_of_page"></a>gimpsignal</span></h2>
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<p>gimpsignal — Portable signal handling.</p>
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</td>
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<td valign="top" align="right"></td>
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<td class="gallery_image" valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<a name="libgimpbase-gimpsignal.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis"><span class="returnvalue">void</span> (<a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()">*GimpSignalHandlerFunc</a>) (<em class="parameter"><code><span class="type">gint</span> signum</code></em>);
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<a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="returnvalue">GimpSignalHandlerFunc</span></a> <a class="link" href="libgimpbase-gimpsignal.html#gimp-signal-private" title="gimp_signal_private ()">gimp_signal_private</a> (<em class="parameter"><code><span class="type">gint</span> signum</code></em>,
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<em class="parameter"><code><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="type">GimpSignalHandlerFunc</span></a> handler</code></em>,
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<em class="parameter"><code><span class="type">gint</span> flags</code></em>);
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</pre>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.description"></a><h2>Description</h2>
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<p>
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Portable signal handling.
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</p>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.details"></a><h2>Details</h2>
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<div class="refsect2">
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<a name="GimpSignalHandlerFunc"></a><h3>GimpSignalHandlerFunc ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span> (*GimpSignalHandlerFunc) (<em class="parameter"><code><span class="type">gint</span> signum</code></em>);</pre>
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<p>
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A prototype for a reference to a signal handler functions. Note
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that each function which takes or returns a variable of this type
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also accepts or may return special values defined by your system's
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signal.h header file (like <em class="parameter"><code>SIG_DFL</code></em> or <em class="parameter"><code>SIG_IGN</code></em>).
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<a name="libgimpbase-gimpsignal.functions"></a><h2>Functions</h2>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col align="left" valign="top">
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<col>
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</colgroup>
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<tbody><tr>
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<td><p><span class="term"><em class="parameter"><code>signum</code></em> :</span></p></td>
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<td>The number of the signal. Useful if different signals are
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handled by a single handler.</td>
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</tr></tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-signal-private"></a><h3>gimp_signal_private ()</h3>
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<pre class="programlisting"><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="returnvalue">GimpSignalHandlerFunc</span></a> gimp_signal_private (<em class="parameter"><code><span class="type">gint</span> signum</code></em>,
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<em class="parameter"><code><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="type">GimpSignalHandlerFunc</span></a> handler</code></em>,
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<em class="parameter"><code><span class="type">gint</span> flags</code></em>);</pre>
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<p>
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This function furnishes a workalike for signal(2) but
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which internally invokes sigaction(2) after certain
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sa_flags are set; these primarily to ensure restarting
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of interrupted system calls. See sigaction(2) It is a
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aid to transition and not new development: that effort
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should employ sigaction directly. [gosgood 18.04.2000]
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</p>
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<p>
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Cause <em class="parameter"><code>handler</code></em> to be run when <em class="parameter"><code>signum</code></em> is delivered. We
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use sigaction(2) rather than signal(2) so that we can control the
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signal handler's environment completely via <em class="parameter"><code>flags</code></em>: some signal(2)
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implementations differ in their sematics, so we need to nail down
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exactly what we want. [austin 06.04.2000]
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</p>
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<div class="variablelist"><table border="0" class="variablelist">
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<colgroup>
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<col align="left" valign="top">
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<col>
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<col width="150px" class="functions_return">
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<col class="functions_name">
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</colgroup>
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>signum</code></em> :</span></p></td>
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<td>Selects signal to be handled see man 5 signal (or man 7 signal)</td>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<span class="c_punctuation">(</span><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()">*GimpSignalHandlerFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>handler</code></em> :</span></p></td>
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<td>Handler that maps to signum. Invoked by O/S.
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Handler gets signal that caused invocation. Corresponds
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to the <em class="parameter"><code>sa_handler</code></em> field of the <em class="parameter"><code>sigaction</code></em> struct.</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
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<td>Preferences. OR'ed SA_<xxx>. See man sigaction. Corresponds
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to the <em class="parameter"><code>sa_flags</code></em> field of the <em class="parameter"><code>sigaction</code></em> struct.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>A reference to the signal handling function which was
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active before the call to <a class="link" href="libgimpbase-gimpsignal.html#gimp-signal-private" title="gimp_signal_private ()"><code class="function">gimp_signal_private()</code></a>.</td>
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<td class="function_type">
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<a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="returnvalue">GimpSignalHandlerFunc</span></a>
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</td>
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<td class="function_name">
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<a class="link" href="libgimpbase-gimpsignal.html#gimp-signal-private" title="gimp_signal_private ()">gimp_signal_private</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.description"></a><h2>Description</h2>
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<p>Portable signal handling.</p>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.functions_details"></a><h2>Functions</h2>
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<div class="refsect2">
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<a name="GimpSignalHandlerFunc"></a><h3>GimpSignalHandlerFunc ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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<span class="c_punctuation">(</span>*GimpSignalHandlerFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">gint</span> signum</code></em>);</pre>
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<p>A prototype for a reference to a signal handler functions. Note
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that each function which takes or returns a variable of this type
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also accepts or may return special values defined by your system's
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signal.h header file (like <em class="parameter"><code>SIG_DFL</code></em>
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or <em class="parameter"><code>SIG_IGN</code></em>
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).</p>
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<div class="refsect3">
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<a name="id-1.2.15.5.2.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>signum</p></td>
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<td class="parameter_description"><p>The number of the signal. Useful if different signals are
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handled by a single handler.</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-signal-private"></a><h3>gimp_signal_private ()</h3>
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<pre class="programlisting"><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="returnvalue">GimpSignalHandlerFunc</span></a>
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gimp_signal_private (<em class="parameter"><code><span class="type">gint</span> signum</code></em>,
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<em class="parameter"><code><a class="link" href="libgimpbase-gimpsignal.html#GimpSignalHandlerFunc" title="GimpSignalHandlerFunc ()"><span class="type">GimpSignalHandlerFunc</span></a> handler</code></em>,
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<em class="parameter"><code><span class="type">gint</span> flags</code></em>);</pre>
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<p>This function furnishes a workalike for signal(2) but
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which internally invokes sigaction(2) after certain
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sa_flags are set; these primarily to ensure restarting
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of interrupted system calls. See sigaction(2) It is a
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aid to transition and not new development: that effort
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should employ sigaction directly. [gosgood 18.04.2000]</p>
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<p>Cause <em class="parameter"><code>handler</code></em>
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to be run when <em class="parameter"><code>signum</code></em>
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is delivered. We
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use sigaction(2) rather than signal(2) so that we can control the
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signal handler's environment completely via <em class="parameter"><code>flags</code></em>
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: some signal(2)
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implementations differ in their sematics, so we need to nail down
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exactly what we want. [austin 06.04.2000]</p>
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<div class="refsect3">
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<a name="id-1.2.15.5.3.6"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>signum</p></td>
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<td class="parameter_description"><p>Selects signal to be handled see man 5 signal (or man 7 signal)</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>handler</p></td>
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<td class="parameter_description"><p>Handler that maps to signum. Invoked by O/S.
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Handler gets signal that caused invocation. Corresponds
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to the <em class="parameter"><code>sa_handler</code></em>
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field of the <em class="parameter"><code>sigaction</code></em>
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struct.</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>flags</p></td>
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<td class="parameter_description"><p>Preferences. OR'ed SA_<xxx>. See man sigaction. Corresponds
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to the <em class="parameter"><code>sa_flags</code></em>
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field of the <em class="parameter"><code>sigaction</code></em>
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struct.</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.2.15.5.3.7"></a><h4>Returns</h4>
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<p> A reference to the signal handling function which was
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active before the call to <a class="link" href="libgimpbase-gimpsignal.html#gimp-signal-private" title="gimp_signal_private ()"><code class="function">gimp_signal_private()</code></a>.</p>
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<p></p>
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</div>
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</div>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.other_details"></a><h2>Types and Values</h2>
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</div>
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<div class="refsect1">
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<a name="libgimpbase-gimpsignal.see-also"></a><h2>See Also</h2>
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signal(2), signal(5 or 7), sigaction(2).
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<p>signal(2), signal(5 or 7), sigaction(2).</p>
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</div>
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</div>
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