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‎reference/csignal.html‎

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2026-01-19T14:34:31">
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2026年01月19日 14時34分31秒
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<span itemprop="datePublished" content="2026-02-14T15:39:52">
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2026年02月14日 15時39分52秒
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@@ -232,17 +232,17 @@ <h3><code>signal</code>関数用のハンドラ指定子</h3>
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</thead>
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<td><code>SIG_DFL</code></td>
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<td><code><a href="csignal/sig_dfl.html">SIG_DFL</a></code></td>
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<td>デフォルト動作を指定する</td>
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<td></td>
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</tr>
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<tr>
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<td><code>SIG_ERR</code></td>
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<td><code><a href="csignal/sig_err.html">SIG_ERR</a></code></td>
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<td><code>signal</code>関数が失敗したことを示す<a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></td>
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<td></td>
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</tr>
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<tr>
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<td><code>SIG_IGN</code></td>
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<td><code><a href="csignal/sig_ign.html">SIG_IGN</a></code></td>
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<td>シグナルを無視する</td>
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<td></td>
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‎reference/csignal/sig_dfl.html‎

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<span itemprop="name">SIG_DFL</span>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2026-02-14T15:39:52">
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2026年02月14日 15時39分52秒
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が更新
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<a class="history" target="_blank" href="https://github.com/cpprefjp/site/commits/master/reference/csignal/sig_dfl.md">
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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</a>
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/csignal/sig_dfl.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">macro</div><div class="header">&lt;csignal&gt;</div><h1 itemprop="name"><span class="token">SIG_DFL</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="cp">#define SIG_DFL <i>see below</i></span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>signal</code>関数に渡される引数として、シグナルハンドラをデフォルトに設定するマクロ。</p>
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<p>シグナル受信時に<code>signal</code>関数で<code>SIG_DFL</code>が指定されている場合、そのシグナルに対する<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>のデフォルト処理が実行される。</p>
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<h2>例</h2>
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<p><div class="yata" id="f76cdff263ed74e4b32a9c00c130b161091d84b9"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;csignal&gt;</span>
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<span class="cp">#include <a href="../iostream.html">&lt;iostream&gt;</a></span>
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<span class="cp">#include <a href="../thread.html">&lt;thread&gt;</a></span>
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<span class="cp">#include <a href="../chrono.html">&lt;chrono&gt;</a></span>
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<span class="k">volatile</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">sig_atomic_t</span><span class="w"> </span><span class="n">flag</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="kt">void</span><span class="w"> </span><span class="nf">handler</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="n">flag</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="n"><a href="signal.html">std::signal</a></span><span class="p">(</span><span class="n">SIGINT</span><span class="p">,</span><span class="w"> </span><span class="n">handler</span><span class="p">);</span>
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<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">"Press Ctrl+C (handled)"</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">flag</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n"><a href="../thread/this_thread/sleep_for.html">std::this_thread::sleep_for</a></span><span class="p">(</span><span class="n"><a href="../chrono/duration_aliases.html">std::chrono::milliseconds</a></span><span class="p">(</span><span class="mi">100</span><span class="p">));</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="c1">// デフォルトに戻す</span>
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<span class="w"> </span><span class="n"><a href="signal.html">std::signal</a></span><span class="p">(</span><span class="n">SIGINT</span><span class="p">,</span><span class="w"> </span><span class="n"><span style="color:#ff0000">SIG_DFL</span></span><span class="p">);</span>
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<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">"Press Ctrl+C again (default action)"</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
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<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(;;)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n"><a href="../thread/this_thread/sleep_for.html">std::this_thread::sleep_for</a></span><span class="p">(</span><span class="n"><a href="../chrono/duration_aliases.html">std::chrono::milliseconds</a></span><span class="p">(</span><span class="mi">100</span><span class="p">));</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力</h3>
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<p><pre><code>Press Ctrl+C (handled)
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Press Ctrl+C again (default action)
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</code></pre></p>
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<h2>関連項目</h2>
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