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172 lines
10 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>安装一个信号处理器</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.pcntl-signal" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pcntl_signal</h1>
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<p class="verinfo">(PHP 4 >= 4.1.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pcntl_signal</span> — <span class="dc-title">安装一个信号处理器</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pcntl-signal-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>pcntl_signal</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$signo</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <code class="parameter">$handler</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$restart_syscalls</code><span class="initializer"> = true</span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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函数<span class="function"><strong>pcntl_signal()</strong></span>为<code class="parameter">signo</code>指定的信号安装一个新
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的信号处理器。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.pcntl-signal-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">signo</code></dt>
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<dd>
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<p class="para">
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信号编号。
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</p>
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</dd>
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<dt>
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<code class="parameter">handler</code></dt>
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<dd>
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<p class="para">
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信号处理器可以是用户创建的函数或方法的名字，也可以是系统常量
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<strong><code>SIG_IGN</code></strong>（译注：忽略信号处理程序）或<strong><code>SIG_DFL（默认信号处理程序）</code></strong>.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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注意当你使用一个对象方法的时候，该对象的引用计数回增加使得它在你改变为其他处理或脚本结束之前是持久存在的。
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</p>
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</p></blockquote>
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</dd>
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<dt>
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<code class="parameter">restart_syscalls</code></dt>
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<dd>
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<p class="para">
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指定当信号到达时系统调用重启是否可用。（译注：经查资料，此参数意为系统调用被信号打断时，系统调用是否从
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开始处重新开始，但根据http://bugs.php.net/bug.php?id=52121，此参数存在bug无效。）
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.pcntl-signal-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.pcntl-signal-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.3.0</td>
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<td>
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增加参数<code class="parameter">restart_syscalls</code>。
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</td>
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</tr>
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<tr>
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<td>4.3.0</td>
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<td>
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对象方法可以作为回调被使用。
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</td>
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</tr>
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<tr>
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<td>4.3.0</td>
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<td>PCNTL现在使用了ticks作为信号处理的回调机制，ticks在速度上远远超过了之前的处理机制。
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这个变化与“用户ticks”遵循了相同的语义。您可以使用<span class="function"><strong>declare()</strong></span>
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语句在程序中指定允许发生回调的位置。这使得我们对异步事件处理的开销最小化。在编译PHP时
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启用pcntl将始终承担这种开销，不论您的脚本中是否真正使用了pcntl。
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PHP 4.3.0使用ticks作为信号处理回调机制，这比以前的机制快了很多。这个变化与
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"<a href="control-structures.declare.html#control-structures.declare.ticks" class="link">用户ticks</a>"
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遵循了相同的语义。您可以使用<a href="control_structures.declare.html" class="link">declare()</a>
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语句在程序中指定允许发生回调的位置。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pcntl-signal-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4328">
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<p><strong>Example #1 <span class="function"><strong>pcntl_signal()</strong></span>示例</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">//使用ticks需要PHP 4.3.0以上版本<br /></span><span style="color: #007700">declare(</span><span style="color: #0000BB">ticks </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//信号处理函数<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">sig_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$signo</span><span style="color: #007700">)<br />{<br /><br /> switch (</span><span style="color: #0000BB">$signo</span><span style="color: #007700">) {<br /> case </span><span style="color: #0000BB">SIGTERM</span><span style="color: #007700">:<br /> </span><span style="color: #FF8000">// 处理SIGTERM信号<br /> </span><span style="color: #007700">exit;<br /> break;<br /> case </span><span style="color: #0000BB">SIGHUP</span><span style="color: #007700">:<br /> </span><span style="color: #FF8000">//处理SIGHUP信号<br /> </span><span style="color: #007700">break;<br /> case </span><span style="color: #0000BB">SIGUSR1</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">"Caught SIGUSR1...\n"</span><span style="color: #007700">;<br /> break;<br /> default:<br /> </span><span style="color: #FF8000">// 处理所有其他信号<br /> </span><span style="color: #007700">}<br /><br />}<br /><br />echo </span><span style="color: #DD0000">"Installing signal handler...\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//安装信号处理器<br /></span><span style="color: #0000BB">pcntl_signal</span><span style="color: #007700">(</span><span style="color: #0000BB">SIGTERM</span><span style="color: #007700">, </span><span style="color: #DD0000">"sig_handler"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">pcntl_signal</span><span style="color: #007700">(</span><span style="color: #0000BB">SIGHUP</span><span style="color: #007700">, </span><span style="color: #DD0000">"sig_handler"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">pcntl_signal</span><span style="color: #007700">(</span><span style="color: #0000BB">SIGUSR1</span><span style="color: #007700">, </span><span style="color: #DD0000">"sig_handler"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 或者在PHP 4.3.0以上版本可以使用对象方法<br />// pcntl_signal(SIGUSR1, array($obj, "do_something");<br /><br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Generating signal SIGTERM to self...\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//向当前进程发送SIGUSR1信号<br /></span><span style="color: #0000BB">posix_kill</span><span style="color: #007700">(</span><span style="color: #0000BB">posix_getpid</span><span style="color: #007700">(), </span><span style="color: #0000BB">SIGUSR1</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"Done\n"<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.pcntl-signal-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="pcntl_fork.html" class="function" rel="rdfs-seeAlso">pcntl_fork()</a> - 在当前进程当前位置产生分支（子进程）。译注：fork是创建了一个子进程，父进程和子进程
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都从fork的位置开始向下继续执行，不同的是父进程执行过程中，得到的fork返回值为子进程
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号，而子进程得到的是0。</span></li>
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<li class="member"><span class="function"><a href="pcntl_waitpid.html" class="function" rel="rdfs-seeAlso">pcntl_waitpid()</a> - 等待或返回fork的子进程状态</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |