function.pcntl-wait.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Waits on or returns the status of a forked child</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pcntl-signal.html">pcntl_signal</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pcntl-waitpid.html">pcntl_waitpid</a></div> <div class="up"><a href="ref.pcntl.html">PCNTL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pcntl-wait" class="refentry"> <div class="refnamediv"> <h1 class="refname">pcntl_wait</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">pcntl_wait</span> — <span class="dc-title">Waits on or returns the status of a forked child</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>pcntl_wait</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter reference">&$status</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$options</tt></span> ] )</div> <p class="para rdfs-comment"> The wait function suspends execution of the current process until a child has exited, or until a signal is delivered whose action is to terminate the current process or to call a signal handling function. If a child has already exited by the time of the call (a so-called "zombie" process), the function returns immediately. Any system resources used by the child are freed. Please see your system's wait(2) man page for specific details as to how wait works on your system. </p> <blockquote><p><b class="note">Note</b>: This function is equivalent to calling <a href="function.pcntl-waitpid.html" class="function">pcntl_waitpid()</a> with a <i>-1</i> <i><tt class="parameter">pid</tt></i> and no <i><tt class="parameter">options</tt></i>. <br /> </p></blockquote> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">status</tt></i></span> <dd> <p class="para"> <b>pcntl_wait()</b> will store status information in the <i><tt class="parameter">status</tt></i> parameter which can be evaluated using the following functions: <a href="function.pcntl-wifexited.html" class="function">pcntl_wifexited()</a>, <a href="function.pcntl-wifstopped.html" class="function">pcntl_wifstopped()</a>, <a href="function.pcntl-wifsignaled.html" class="function">pcntl_wifsignaled()</a>, <a href="function.pcntl-wexitstatus.html" class="function">pcntl_wexitstatus()</a>, <a href="function.pcntl-wtermsig.html" class="function">pcntl_wtermsig()</a> and <a href="function.pcntl-wstopsig.html" class="function">pcntl_wstopsig()</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">options</tt></i></span> <dd> <p class="para"> If wait3 is available on your system (mostly BSD-style systems), you can provide the optional <i><tt class="parameter">options</tt></i> parameter. If this parameter is not provided, wait will be used for the system call. If wait3 is not available, providing a value for <i><tt class="parameter">options </tt></i> will have no effect. The value of <i><tt class="parameter">options </tt></i> is the value of zero or more of the following two constants <i>OR</i>'ed together: <table border="5"> <caption><b>Possible values for <i><tt class="parameter">options</tt></i></b></caption> <colgroup> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>WNOHANG</i></td> <td colspan="1" rowspan="1" align="left"> Return immediately if no child has exited. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>WUNTRACED</i></td> <td colspan="1" rowspan="1" align="left"> Return for children which are stopped, and whose status has not been reported. </td> </tr> </tbody> </colgroup> </table> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>pcntl_wait()</b> returns the process ID of the child which exited, -1 on error or zero if WNOHANG was provided as an option (on wait3-available systems) and no child was available. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pcntl-fork.html" class="function" rel="rdfs-seeAlso">pcntl_fork()</a></li> <li class="member"><a href="function.pcntl-signal.html" class="function" rel="rdfs-seeAlso">pcntl_signal()</a></li> <li class="member"><a href="function.pcntl-wifexited.html" class="function" rel="rdfs-seeAlso">pcntl_wifexited()</a></li> <li class="member"><a href="function.pcntl-wifstopped.html" class="function" rel="rdfs-seeAlso">pcntl_wifstopped()</a></li> <li class="member"><a href="function.pcntl-wifsignaled.html" class="function" rel="rdfs-seeAlso">pcntl_wifsignaled()</a></li> <li class="member"><a href="function.pcntl-wexitstatus.html" class="function" rel="rdfs-seeAlso">pcntl_wexitstatus()</a></li> <li class="member"><a href="function.pcntl-wtermsig.html" class="function" rel="rdfs-seeAlso">pcntl_wtermsig()</a></li> <li class="member"><a href="function.pcntl-wstopsig.html" class="function" rel="rdfs-seeAlso">pcntl_wstopsig()</a></li> <li class="member"><a href="function.pcntl-waitpid.html" class="function" rel="rdfs-seeAlso">pcntl_waitpid()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pcntl-signal.html">pcntl_signal</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pcntl-waitpid.html">pcntl_waitpid</a></div> <div class="up"><a href="ref.pcntl.html">PCNTL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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