📄 function.shm-attach.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>Creates or open a shared memory segment</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.sem-remove.html">sem_remove</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.shm-detach.html">shm_detach</a></div> <div class="up"><a href="ref.sem.html">Semaphore Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.shm-attach" class="refentry"> <div class="refnamediv"> <h1 class="refname">shm_attach</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">shm_attach</span> — <span class="dc-title">Creates or open a shared memory segment</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>shm_attach</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$key</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$memsize</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$perm</tt></span> ]] )</div> <p class="para rdfs-comment"> <b>shm_attach()</b> returns an id that can be used to access the System V shared memory with the given <i><tt class="parameter">key</tt></i>, the first call creates the shared memory segment with <i><tt class="parameter">memsize</tt></i> and the optional perm-bits <i><tt class="parameter">perm</tt></i>. </p> <p class="para"> A second call to <b>shm_attach()</b> for the same <i><tt class="parameter">key</tt></i> will return a different shared memory identifier, but both identifiers access the same underlying shared memory. <i><tt class="parameter">memsize</tt></i> and <i><tt class="parameter">perm</tt></i> will be ignored. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">key</tt></i></span> <dd> <p class="para"> A numeric shared memory segment ID </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">memsize</tt></i></span> <dd> <p class="para"> The memory size. If not provided, default to the <i>sysvshm.init_mem</i> in the <var class="filename">php.ini</var>, otherwise 10000 bytes. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">perm</tt></i></span> <dd> <p class="para"> The optional permission bits. Default to 0666. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a shared memory segment identifier. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.shm-detach.html" class="function" rel="rdfs-seeAlso">shm_detach()</a></li> <li class="member"><a href="function.ftok.html" class="function" rel="rdfs-seeAlso">ftok()</a></li> </ul> </p> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sem-remove.html">sem_remove</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.shm-detach.html">shm_detach</a></div> <div class="up"><a href="ref.sem.html">Semaphore 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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