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<section id="module-syslog">
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<span id="syslog-unix-syslog-library-routines"></span><h1>Unix syslog 库例程<a class="headerlink" href="#module-syslog" title="永久链接至标题">¶</a></h1>
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<hr class="docutils" />
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<p>此模块提供一个接口到Unix <code class="docutils literal notranslate"><span class="pre">syslog</span></code> 日常库. 参考 Unix 手册页关于 <code class="docutils literal notranslate"><span class="pre">syslog</span></code> 设施的详细描述.</p>
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<p>此模块包装了系统的 <code class="docutils literal notranslate"><span class="pre">syslog</span></code> 例程族。 一个能与 syslog 服务器对话的纯 Python 库则以 <a class="reference internal" href="logging.handlers.html#module-logging.handlers" title="logging.handlers: Handlers for the logging module."><code class="xref py py-mod docutils literal notranslate"><span class="pre">logging.handlers</span></code></a> 模块中 <code class="xref py py-class docutils literal notranslate"><span class="pre">SysLogHandler</span></code> 类的形式提供。</p>
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<p>这个模块定义了以下函数：</p>
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<dl class="function">
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<dt id="syslog.syslog">
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<code class="sig-prename descclassname">syslog.</code><code class="sig-name descname">syslog</code><span class="sig-paren">(</span><em class="sig-param">message</em><span class="sig-paren">)</span><a class="headerlink" href="#syslog.syslog" title="永久链接至目标">¶</a></dt>
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<dt>
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<code class="sig-prename descclassname">syslog.</code><code class="sig-name descname">syslog</code><span class="sig-paren">(</span><em class="sig-param">priority</em>, <em class="sig-param">message</em><span class="sig-paren">)</span></dt>
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<dd><p>将字符串 <em>message</em> 发送到系统日志记录器。 如有必要会添加末尾换行符。 每条消息都带有一个由 <em>facility</em> 和 <em>level</em> 组成的优先级标价签。 可选的 <em>priority</em> 参数默认值为 <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_INFO</span></code>，它确定消息的优先级。 如果未在 <em>priority</em> 中使用逻辑或 (<code class="docutils literal notranslate"><span class="pre">LOG_INFO</span> <span class="pre">|</span> <span class="pre">LOG_USER</span></code>) 对 facility 进行编码，则会使用在 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 调用中所给定的值。</p>
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<p>如果 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 未在对 <a class="reference internal" href="#module-syslog" title="syslog: An interface to the Unix syslog library routines. (Unix)"><code class="xref py py-func docutils literal notranslate"><span class="pre">syslog()</span></code></a> 的调用之前被调用，则将不带参数地调用 <code class="docutils literal notranslate"><span class="pre">openlog()</span></code>。</p>
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<p class="audit-hook">引发一个 <a class="reference internal" href="sys.html#auditing"><span class="std std-ref">审计事件</span></a> <code class="docutils literal notranslate"><span class="pre">syslog.syslog</span></code> 并附带参数 <code class="docutils literal notranslate"><span class="pre">priority</span></code>, <code class="docutils literal notranslate"><span class="pre">message</span></code>。</p>
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</dd></dl>
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<dl class="function">
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<dt id="syslog.openlog">
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<code class="sig-prename descclassname">syslog.</code><code class="sig-name descname">openlog</code><span class="sig-paren">(</span><span class="optional">[</span><em class="sig-param">ident</em><span class="optional">[</span>, <em class="sig-param">logoption</em><span class="optional">[</span>, <em class="sig-param">facility</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#syslog.openlog" title="永久链接至目标">¶</a></dt>
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<dd><p>后续 <a class="reference internal" href="#module-syslog" title="syslog: An interface to the Unix syslog library routines. (Unix)"><code class="xref py py-func docutils literal notranslate"><span class="pre">syslog()</span></code></a> 调用的日志选项可以通过调用 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 来设置。 如果日志当前未打开则 <a class="reference internal" href="#module-syslog" title="syslog: An interface to the Unix syslog library routines. (Unix)"><code class="xref py py-func docutils literal notranslate"><span class="pre">syslog()</span></code></a> 将不带参数地调用 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a>。</p>
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<p>可选的 <em>ident</em> 关键字参数是在每条消息前添加的字符串，默认为 <code class="docutils literal notranslate"><span class="pre">sys.argv[0]</span></code> 去除打头的路径部分。 可选的 <em>logoption</em> 关键字参数（默认为 0）是一个位字段 -- 请参见下文了解可能的组合值。 可选的 <em>facility</em> 关键字参数 (默认为 <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_USER</span></code>) 为没有显式编码 facility 的消息设置默认的 facility。</p>
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<p class="audit-hook">引发一个 <a class="reference internal" href="sys.html#auditing"><span class="std std-ref">审计事件</span></a> <code class="docutils literal notranslate"><span class="pre">syslog.openlog</span></code> 并附带参数 <code class="docutils literal notranslate"><span class="pre">ident</span></code>, <code class="docutils literal notranslate"><span class="pre">logoption</span></code>, <code class="docutils literal notranslate"><span class="pre">facility</span></code>。</p>
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<div class="versionchanged">
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<p><span class="versionmodified changed">在 3.2 版更改: </span>在之前的版本中，不允许关键字参数，并且要求必须有 <em>ident</em>。 <em>ident</em> 的默认值依赖于系统库，它往往为 <code class="docutils literal notranslate"><span class="pre">python</span></code> 而不是 Python 程序文件的实际名称。</p>
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</div>
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</dd></dl>
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<dl class="function">
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<dt id="syslog.closelog">
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<code class="sig-prename descclassname">syslog.</code><code class="sig-name descname">closelog</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#syslog.closelog" title="永久链接至目标">¶</a></dt>
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<dd><p>重置日志模块值并且调用系统库 <code class="docutils literal notranslate"><span class="pre">closelog()</span></code>.</p>
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<p>这使得此模块在初始导入时行为固定。 例如，<a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 将在首次调用 <a class="reference internal" href="#module-syslog" title="syslog: An interface to the Unix syslog library routines. (Unix)"><code class="xref py py-func docutils literal notranslate"><span class="pre">syslog()</span></code></a> 时被调用（如果 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 还未被调用过），并且 <em>ident</em> 和其他 <a class="reference internal" href="#syslog.openlog" title="syslog.openlog"><code class="xref py py-func docutils literal notranslate"><span class="pre">openlog()</span></code></a> 形参会被重置为默认值。</p>
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<p class="audit-hook">引发一个不带参数的 <a class="reference internal" href="sys.html#auditing"><span class="std std-ref">审计事件</span></a> <code class="docutils literal notranslate"><span class="pre">syslog.closelog</span></code>。</p>
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</dd></dl>
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<dl class="function">
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<dt id="syslog.setlogmask">
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<code class="sig-prename descclassname">syslog.</code><code class="sig-name descname">setlogmask</code><span class="sig-paren">(</span><em class="sig-param">maskpri</em><span class="sig-paren">)</span><a class="headerlink" href="#syslog.setlogmask" title="永久链接至目标">¶</a></dt>
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<dd><p>将优先级掩码设为 <em>maskpri</em> 并返回之前的掩码值。 调用 <a class="reference internal" href="#module-syslog" title="syslog: An interface to the Unix syslog library routines. (Unix)"><code class="xref py py-func docutils literal notranslate"><span class="pre">syslog()</span></code></a> 并附带未在 <em>maskpri</em> 中设置的优先级将会被忽略。 默认设置为记录所有优先级。 函数 <code class="docutils literal notranslate"><span class="pre">LOG_MASK(pri)</span></code> 可计算单个优先级 <em>pri</em> 的掩码。 函数 <code class="docutils literal notranslate"><span class="pre">LOG_UPTO(pri)</span></code> 可计算包括 <em>pri</em> 在内的所有优先级的掩码。</p>
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<p class="audit-hook">引发一个 <a class="reference internal" href="sys.html#auditing"><span class="std std-ref">审计事件</span></a> <code class="docutils literal notranslate"><span class="pre">syslog.setlogmask</span></code> 并附带参数 <code class="docutils literal notranslate"><span class="pre">maskpri</span></code>。</p>
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</dd></dl>
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<p>此模块定义了一下常量:</p>
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<dl class="simple">
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<dt>优先级级别 (高到低):</dt><dd><p><code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_EMERG</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_ALERT</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_CRIT</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_ERR</span></code>,
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<code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_WARNING</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_NOTICE</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_INFO</span></code>,
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<code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_DEBUG</span></code>.</p>
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</dd>
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<dt>设施:</dt><dd><p><code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_KERN</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_USER</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_MAIL</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_DAEMON</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_AUTH</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_LPR</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_NEWS</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_UUCP</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_CRON</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_SYSLOG</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_LOCAL0</span></code> to <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_LOCAL7</span></code>，如果 <code class="docutils literal notranslate"><span class="pre"><syslog.h></span></code> 中有定义则还有 <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_AUTHPRIV</span></code>。</p>
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</dd>
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<dt>日志选项：</dt><dd><p><code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_PID</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_CONS</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_NDELAY</span></code>，如果 <code class="docutils literal notranslate"><span class="pre"><syslog.h></span></code> 中有定义则还有 <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_ODELAY</span></code>, <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_NOWAIT</span></code> 以及 <code class="xref py py-const docutils literal notranslate"><span class="pre">LOG_PERROR</span></code>。</p>
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</dd>
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</dl>
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<section id="examples">
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<h2>例子<a class="headerlink" href="#examples" title="永久链接至标题">¶</a></h2>
|
||
<section id="simple-example">
|
||
<h3>简单示例<a class="headerlink" href="#simple-example" title="永久链接至标题">¶</a></h3>
|
||
<p>一个简单的示例集:</p>
|
||
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">syslog</span>
|
||
|
||
<span class="n">syslog</span><span class="o">.</span><span class="n">syslog</span><span class="p">(</span><span class="s1">'Processing started'</span><span class="p">)</span>
|
||
<span class="k">if</span> <span class="n">error</span><span class="p">:</span>
|
||
<span class="n">syslog</span><span class="o">.</span><span class="n">syslog</span><span class="p">(</span><span class="n">syslog</span><span class="o">.</span><span class="n">LOG_ERR</span><span class="p">,</span> <span class="s1">'Processing started'</span><span class="p">)</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>一个设置多种日志选项的示例，其中有在日志消息中包含进程 ID，以及将消息写入用于邮件日志记录的目标设施等:</p>
|
||
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">syslog</span><span class="o">.</span><span class="n">openlog</span><span class="p">(</span><span class="n">logoption</span><span class="o">=</span><span class="n">syslog</span><span class="o">.</span><span class="n">LOG_PID</span><span class="p">,</span> <span class="n">facility</span><span class="o">=</span><span class="n">syslog</span><span class="o">.</span><span class="n">LOG_MAIL</span><span class="p">)</span>
|
||
<span class="n">syslog</span><span class="o">.</span><span class="n">syslog</span><span class="p">(</span><span class="s1">'E-mail processing initiated...'</span><span class="p">)</span>
|
||
</pre></div>
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